:root {
    --chain-navy: #294738;
    --chain-blue: #7fae8a;
    --chain-green: #6eaf80;
    --chain-cyan: #7eae8a;
    --chain-laser: #9bd0a6;
    --chain-mint: #f2f8f1;
    --chain-ink: #20352a;
    --chain-muted: #526759;
    --chain-line: rgba(48, 70, 58, 0.14);
    --chain-surface: #f7f9f5;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: #e4f5ff; background: #061a33; font-family: "PingFang SC", "Microsoft YaHei", sans-serif; }
a { color: inherit; text-decoration: none; }
.chain-shell { overflow: hidden; background: radial-gradient(circle at 80% 30%, rgba(34, 157, 220, .23), transparent 30%), #061a33; }
.header { position: fixed; z-index: 1000; top: 0; right: 0; left: 0; padding: 0 40px; background: linear-gradient(to bottom, rgba(0, 0, 0, .6), transparent); transition: all .3s ease; }
.header.scrolled { background: rgba(255, 255, 255, .98); box-shadow: 0 2px 20px rgba(0, 0, 0, .08); backdrop-filter: blur(10px); }
.header-inner { display: flex; align-items: center; height: 72px; max-width: 1400px; margin: 0 auto; }
.header-inner .logo { flex-shrink: 0; }
.header-inner nav { margin-left: auto; }
.logo { display: flex; align-items: center; }
.brand-logo { display: block; width: 235px; height: auto; max-width: 100%; }
.header:not(.scrolled) .brand-logo { content: url("assets/brand-logo-light.png?v=20260728-group14"); }
.nav-menu { display: flex; gap: 4px; margin: 0; padding: 0; list-style: none; }
.nav-menu > li { position: relative; }
.nav-menu > li > a { display: block; padding: 10px 18px; border-radius: 4px; color: rgba(255, 255, 255, .9); font-size: 15px; white-space: nowrap; transition: all .3s ease; }
.nav-menu > li > a:hover, .nav-menu > li.active > a { color: #fff; background: rgba(255, 255, 255, .15); }
.header.scrolled .nav-menu > li > a { color: #24122e; }
.header.scrolled .nav-menu > li > a:hover, .header.scrolled .nav-menu > li.active > a { color: #24122e; background: rgba(36, 18, 46, .08); }
.nav-menu .dropdown { position: absolute; top: 100%; left: 0; display: none; min-width: 140px; padding: 8px 0; border-radius: 6px; background: #fff; box-shadow: 0 10px 40px rgba(0, 0, 0, .15); }
.nav-menu li:hover .dropdown, .nav-menu li.submenu-open .dropdown { display: block; }
.nav-menu .dropdown a { display: block; padding: 10px 20px; color: #24122e; font-size: 14px; white-space: nowrap; }
.nav-menu .dropdown a:hover { background: rgba(36, 18, 46, .06); }
.header-actions { display: flex; align-items: center; gap: 16px; }
.lang-switch { position: relative; display: flex; align-items: center; gap: 6px; padding: 7px 10px; border: 1px solid rgba(255, 255, 255, .3); border-radius: 20px; color: rgba(255, 255, 255, .8); font-size: 13px; cursor: pointer; user-select: none; }
.header.scrolled .lang-switch { border-color: rgba(0, 0, 0, .2); color: #24122e; }
.lang-switch .arrow { font-size: 10px; transition: transform .3s ease; }
.lang-switch.open .arrow { transform: rotate(180deg); }
.lang-dropdown { position: absolute; top: calc(100% + 8px); right: 0; display: none; width: 118px; padding: 6px 0; border-radius: 6px; background: #fff; box-shadow: 0 10px 40px rgba(0, 0, 0, .15); }
.lang-dropdown.show { display: block; }
.lang-dropdown a { display: block; padding: 8px 14px; color: #24122e; font-size: 13px; }
.lang-dropdown a:hover, .lang-dropdown a.active { background: rgba(36, 18, 46, .06); }
.menu-toggle { display: none; width: 32px; padding: 5px 0; border: 0; background: transparent; cursor: pointer; }
.menu-toggle span { display: block; height: 2px; margin: 5px 0; background: #fff; }
.header.scrolled .menu-toggle span { background: #24122e; }

.chain-hero { position: relative; min-height: 630px; padding: 140px 48px 72px; color: #fff; background: radial-gradient(circle at 88% 14%, rgba(70, 255, 198, .28), transparent 24%), radial-gradient(circle at 14% 82%, rgba(66, 163, 255, .28), transparent 32%), linear-gradient(130deg, #061a33 2%, #0b4276 54%, #0a7780 120%); }
.chain-hero::before, .chain-hero::after { position: absolute; content: ""; pointer-events: none; }
.chain-hero::before { right: 4%; bottom: -16%; width: min(40vw, 560px); aspect-ratio: 1; border: 1px solid rgba(101, 229, 255, .16); border-radius: 50%; box-shadow: 0 0 0 52px rgba(101, 229, 255, .025), 0 0 0 104px rgba(101, 229, 255, .015); }
.chain-hero::after { inset: 0; opacity: .3; background-image: linear-gradient(rgba(101, 229, 255, .13) 1px, transparent 1px), linear-gradient(90deg, rgba(101, 229, 255, .13) 1px, transparent 1px); background-size: 42px 42px; mask-image: linear-gradient(90deg, #000 0%, rgba(0, 0, 0, .4) 56%, transparent 92%); }
.chain-hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, .92fr) minmax(440px, 1.08fr); align-items: end; gap: clamp(42px, 7vw, 96px); width: min(1200px, 100%); margin: 0 auto; }
.chain-hero-copy { padding-bottom: 20px; }
.chain-eyebrow { display: inline-flex; align-items: center; gap: 10px; margin: 0 0 22px; color: var(--chain-cyan); font-size: 11px; font-weight: 700; letter-spacing: .18em; }
.chain-eyebrow::before { width: 26px; height: 1px; background: currentColor; content: ""; }
.chain-hero h1 { max-width: 760px; margin: 0; font-size: clamp(38px, 4.4vw, 64px); line-height: 1.12; letter-spacing: -.055em; text-wrap: pretty; text-shadow: 0 0 30px rgba(105, 230, 255, .13); }
.chain-hero p { max-width: 545px; margin: 24px 0 0; color: rgba(222, 239, 255, .76); font-size: 16px; line-height: 1.9; }
.chain-hero-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 30px; }
.chain-hero-meta span { padding: 8px 12px; border: 1px solid rgba(101, 229, 255, .34); border-radius: 3px; color: #c7f5ff; font-size: 11px; letter-spacing: .08em; background: rgba(101, 229, 255, .06); }
.chain-hero-visual { position: relative; height: 398px; margin: 0; overflow: hidden; border: 1px solid rgba(101, 229, 255, .52); border-radius: 3px 26px 3px 26px; background: #103755; box-shadow: 0 0 0 1px rgba(101, 229, 255, .08), 0 28px 70px rgba(0, 0, 0, .38), inset 0 0 34px rgba(101, 229, 255, .14); transform: perspective(900px) rotateX(var(--hero-rotate-x, 0deg)) rotateY(var(--hero-rotate-y, 0deg)); transform-style: preserve-3d; transition: transform .18s ease-out, box-shadow .25s ease; }
.chain-hero-visual:hover { box-shadow: 0 0 0 1px rgba(101, 229, 255, .25), 0 30px 82px rgba(0, 0, 0, .44), 0 0 34px rgba(101, 229, 255, .16), inset 0 0 34px rgba(101, 229, 255, .14); }
.chain-hero-visual::before { position: absolute; z-index: 2; top: 16px; right: 16px; width: 48px; height: 48px; border-top: 2px solid var(--chain-laser); border-right: 2px solid var(--chain-laser); content: ""; }
.chain-hero-visual::after { position: absolute; inset: 0; background: radial-gradient(circle at var(--hero-glow-x, 56%) var(--hero-glow-y, 36%), rgba(101, 229, 255, .28), transparent 28%), linear-gradient(180deg, rgba(3, 15, 27, .03) 24%, rgba(3, 12, 24, .82)), linear-gradient(90deg, rgba(31, 252, 188, .14), transparent 42%); content: ""; }
.chain-hero-visual img { display: block; width: 100%; height: 100%; object-fit: cover; filter: saturate(.86) contrast(1.12) brightness(.78); transform: scale(1.035); }
.chain-hero-visual figcaption { position: absolute; z-index: 3; right: 24px; bottom: 20px; left: 24px; color: #d9fbff; font-size: 12px; font-weight: 700; letter-spacing: .12em; }
.chain-hero-hud { position: absolute; z-index: 4; top: 18px; left: 18px; display: flex; flex-direction: column; gap: 5px; padding: 10px 12px; border: 1px solid rgba(101, 229, 255, .4); border-radius: 2px; background: rgba(3, 13, 24, .58); color: var(--chain-cyan); backdrop-filter: blur(8px); }
.chain-hero-hud span { font-size: 9px; font-weight: 700; letter-spacing: .16em; }
.chain-hero-hud strong { color: #fff; font-size: 14px; letter-spacing: .12em; }
.chain-hero-scan { position: absolute; z-index: 3; top: -30%; right: 0; left: 0; height: 34%; background: linear-gradient(180deg, transparent, rgba(101, 229, 255, .16), transparent); mix-blend-mode: screen; animation: chain-scan 4.8s linear infinite; pointer-events: none; }

.chain-page-nav { position: sticky; z-index: 5; top: 0; border-top: 1px solid rgba(101, 229, 255, .16); border-bottom: 1px solid rgba(101, 229, 255, .16); background: rgba(3, 12, 23, .88); backdrop-filter: blur(18px); }
.chain-page-nav-inner { display: flex; align-items: center; gap: 44px; width: min(1200px, 100%); margin: 0 auto; padding: 14px 48px; overflow-x: auto; scrollbar-width: none; }
.chain-page-nav-inner::-webkit-scrollbar { display: none; }
.chain-page-nav-inner > p { flex: 0 0 auto; margin: 0; color: var(--chain-cyan); font-size: 11px; font-weight: 700; letter-spacing: .14em; }
.chain-node-list { display: flex; flex: 1; min-width: 620px; margin: 0; padding: 0; list-style: none; }
.chain-node-list li { position: relative; flex: 1; }
.chain-node-list li { animation: chain-node-boot .52s calc(var(--node-index) * 80ms) both; }
.chain-node-list li:not(:last-child)::after { position: absolute; top: 16px; left: calc(50% + 22px); width: calc(100% - 44px); height: 1px; background: rgba(101, 229, 255, .24); content: ""; }
.chain-node-list a { position: relative; z-index: 1; display: inline-flex; flex-direction: column; align-items: center; gap: 7px; color: rgba(210, 233, 247, .62); font-size: 13px; transition: color .2s ease; }
.chain-node-number { display: grid; place-items: center; width: 33px; height: 33px; border: 1px solid rgba(101, 229, 255, .42); border-radius: 3px; background: #081a2a; color: #94cdda; font-size: 11px; font-weight: 700; transition: all .2s ease; }
.chain-node-label { font-weight: 600; }
.chain-node-list a:hover, .chain-node-list li.active a { color: #fff; }
.chain-node-list a:hover .chain-node-number, .chain-node-list li.active .chain-node-number { border-color: var(--chain-laser); background: rgba(119, 255, 191, .16); box-shadow: 0 0 0 4px rgba(119, 255, 191, .08), 0 0 18px rgba(119, 255, 191, .44); color: var(--chain-laser); }
.chain-node-list li.active:not(:last-child)::after { background: linear-gradient(90deg, var(--chain-laser), rgba(101, 229, 255, .24)); }

.chain-section { position: relative; width: min(1200px, 100%); margin: 0 auto; padding: 100px 48px; }
.chain-section::before { position: absolute; inset: 30px 48px; z-index: -1; border: 1px solid rgba(101, 229, 255, .09); background-image: linear-gradient(rgba(101, 229, 255, .035) 1px, transparent 1px), linear-gradient(90deg, rgba(101, 229, 255, .035) 1px, transparent 1px); background-size: 34px 34px; content: ""; }
.chain-section-kicker { margin: 0 0 12px; color: var(--chain-cyan); font-size: 11px; font-weight: 700; letter-spacing: .16em; }
.chain-section-title { max-width: 870px; margin: 0; color: #fff; font-size: clamp(32px, 3.9vw, 52px); line-height: 1.2; letter-spacing: -.045em; }
.chain-section-lead { max-width: 720px; margin: 18px 0 0; color: rgba(208, 226, 241, .68); font-size: 16px; line-height: 1.9; }
.chain-scene { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(290px, .9fr); gap: 0; align-items: stretch; margin-top: 38px; border: 1px solid var(--chain-line); border-radius: 16px; overflow: hidden; background: var(--chain-surface); }
.chain-scene figure { min-height: 340px; margin: 0; overflow: hidden; background: #dfe8e4; }
.chain-scene img { display: block; width: 100%; height: 100%; min-height: 340px; object-fit: cover; transition: transform .35s ease; }
.chain-scene:hover img { transform: scale(1.035); }
.chain-scene > div { display: flex; flex-direction: column; justify-content: center; padding: 38px 42px; }
.chain-scene span { color: #198c66; font-size: 12px; font-weight: 700; letter-spacing: .12em; }
.chain-scene h3 { margin: 28px 0 14px; font-size: 29px; line-height: 1.3; }
.chain-scene p { margin: 0; color: var(--chain-muted); font-size: 15px; line-height: 1.9; }
.chain-chain-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin-top: 50px; border: 1px solid var(--chain-line); border-radius: 16px; overflow: hidden; }
.chain-stage { position: relative; min-height: 258px; padding: 28px 24px; background: #fff; transition: background .2s ease, transform .2s ease; }
.chain-stage:not(:last-child) { border-right: 1px solid var(--chain-line); }
.chain-stage:hover { z-index: 1; background: var(--chain-mint); transform: translateY(-6px); }
.chain-stage-num { display: block; color: #1c9d72; font-size: 12px; font-weight: 700; letter-spacing: .12em; }
.chain-stage h3 { margin: 46px 0 10px; font-size: 24px; }
.chain-stage p { margin: 0; color: var(--chain-muted); font-size: 14px; line-height: 1.75; }
.chain-stage-arrow { position: absolute; right: -11px; top: 36px; z-index: 2; display: grid; place-items: center; width: 22px; height: 22px; border: 1px solid var(--chain-line); border-radius: 50%; background: #fff; color: #168b64; font-size: 14px; }

.chain-band { position: relative; overflow: hidden; border-top: 1px solid rgba(140, 239, 255, .28); border-bottom: 1px solid rgba(140, 239, 255, .28); background: linear-gradient(125deg, #0a3865 4%, #126bb3 56%, #0c8e8e 120%); }
.chain-band::before { position: absolute; inset: 0; opacity: .25; background-image: linear-gradient(rgba(101, 229, 255, .08) 1px, transparent 1px), linear-gradient(90deg, rgba(101, 229, 255, .08) 1px, transparent 1px); background-size: 46px 46px; mask-image: linear-gradient(90deg, transparent, #000 20%, #000 80%, transparent); content: ""; }
.chain-band-inner { position: relative; display: grid; grid-template-columns: 1fr; gap: 46px; width: min(1200px, 100%); margin: 0 auto; padding: 88px 48px; }
.chain-band-sticky { display: grid; grid-template-columns: minmax(300px, .72fr) minmax(0, 1.28fr); gap: 48px; align-items: end; }
.chain-band-sticky h2 { margin: 0; color: #fff; font-size: clamp(30px, 3.2vw, 42px); line-height: 1.3; }
.chain-band-sticky p { max-width: 530px; margin: 0; color: rgba(255, 255, 255, .68); line-height: 1.85; }
.chain-band-sticky .chain-section-kicker { color: #9cf2ce; }
.chain-value-list { display: grid; gap: 15px; }
.chain-value { display: grid; grid-template-columns: 36px 1fr; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--chain-line); }
.chain-value:last-child { border-bottom: 0; }
.chain-value span { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 50%; background: #d9f8ea; color: #117e59; font-size: 13px; font-weight: 700; }
.chain-value h3 { margin: 0 0 8px; font-size: 18px; }
.chain-value p { margin: 0; color: var(--chain-muted); font-size: 14px; line-height: 1.8; }

.chain-detail-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(235px, 1fr)); gap: 16px; margin-top: 38px; }
.chain-detail-card { position: relative; min-height: 232px; padding: 30px; border: 1px solid rgba(101, 229, 255, .18); border-radius: 4px 16px 4px 16px; background: radial-gradient(circle at var(--pointer-x, 50%) var(--pointer-y, 50%), rgba(101, 229, 255, .13), transparent 36%), linear-gradient(145deg, rgba(16, 39, 61, .88), rgba(6, 17, 30, .94)); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .045), 0 8px 22px rgba(0, 0, 0, .14); overflow: hidden; transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease; }
.chain-detail-card::before { position: absolute; top: 0; right: 0; width: 74px; height: 74px; border-top: 1px solid rgba(101, 229, 255, .22); border-right: 1px solid rgba(101, 229, 255, .22); content: ""; }
.chain-detail-card::after { position: absolute; right: 0; bottom: 0; left: 0; height: 3px; background: linear-gradient(90deg, var(--chain-cyan), var(--chain-laser)); box-shadow: 0 0 14px rgba(101, 229, 255, .55); content: ""; transform: scaleX(0); transform-origin: left; transition: transform .24s ease; }
.chain-detail-card:hover { border-color: rgba(101, 229, 255, .62); transform: translateY(-7px) perspective(700px) rotateX(var(--card-rotate-x, 0deg)) rotateY(var(--card-rotate-y, 0deg)); box-shadow: 0 20px 42px rgba(0, 0, 0, .28), 0 0 28px rgba(101, 229, 255, .1); }
.chain-detail-card:hover::after { transform: scaleX(1); }
.chain-detail-card span { color: var(--chain-laser); font-size: 11px; font-weight: 700; letter-spacing: .14em; }
.chain-detail-card h3 { margin: 16px 0 10px; color: #fff; font-size: 22px; }
.chain-detail-card p { margin: 0; color: rgba(211, 230, 244, .62); font-size: 14px; line-height: 1.8; }
.chain-detail-card-assist { border-color: rgba(139, 242, 199, .3); background: radial-gradient(circle at var(--pointer-x, 50%) var(--pointer-y, 50%), rgba(139, 242, 199, .2), transparent 38%), linear-gradient(145deg, rgba(17, 68, 65, .9), rgba(5, 25, 30, .96)); }
.chain-detail-card-assist::after { background: linear-gradient(90deg, #9bf3cc, #f0fff7); box-shadow: 0 0 14px rgba(155, 243, 204, .62); }
.chain-detail-card-assist span { color: #a7f8d5; }
.chain-detail-card-shared { border-color: rgba(75, 223, 232, .32); background: radial-gradient(circle at var(--pointer-x, 50%) var(--pointer-y, 50%), rgba(75, 223, 232, .2), transparent 38%), linear-gradient(145deg, rgba(8, 59, 79, .92), rgba(4, 20, 36, .98)); }
.chain-detail-card-shared::after { background: linear-gradient(90deg, #52e4ed, #70a7ff); box-shadow: 0 0 14px rgba(82, 228, 237, .62); }
.chain-detail-card-shared span { color: #70eefa; }
.chain-detail-card-delivery { border-color: rgba(255, 159, 74, .38); background: radial-gradient(circle at var(--pointer-x, 50%) var(--pointer-y, 50%), rgba(255, 139, 52, .2), transparent 38%), linear-gradient(145deg, rgba(72, 36, 13, .93), rgba(29, 16, 12, .98)); }
.chain-detail-card-delivery::after { background: linear-gradient(90deg, #ff8a3c, #ffe166); box-shadow: 0 0 14px rgba(255, 138, 60, .62); }
.chain-detail-card-delivery span { color: #ffba75; }
.chain-gallery-block, .chain-logic-block { margin-top: 74px; }
.chain-section-scenarios-only .chain-gallery-block { margin-top: 48px; }
.chain-demo-section { padding-top: 82px; padding-bottom: 100px; }
.chain-demo-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(360px, 420px); gap: clamp(52px, 8vw, 120px); align-items: center; max-width: 1120px; margin: 0 auto; }
.chain-demo-inner-only { display: block; }
.chain-demo-inner-only .chain-demo-stage { margin: 0 auto; }
.chain-demo-copy { max-width: 530px; }
.chain-demo-copy h2 { margin: 0 0 20px; color: #fff; font-size: clamp(32px, 4vw, 52px); line-height: 1.2; }
.chain-demo-copy > p { margin: 0; color: rgba(211, 230, 244, .72); font-size: 16px; line-height: 1.9; }
.chain-demo-copy ul { display: grid; gap: 0; margin: 30px 0 0; padding: 0; border-top: 1px solid rgba(101, 229, 255, .22); list-style: none; }
.chain-demo-copy li { padding: 15px 0; border-bottom: 1px solid rgba(101, 229, 255, .22); color: #dff8ff; font-size: 15px; }
.chain-demo-copy li::before { margin-right: 10px; color: var(--chain-laser); content: "•"; }
.chain-demo-stage { justify-self: center; width: 100%; max-width: 420px; overflow: hidden; border: 1px solid rgba(101, 229, 255, .36); border-radius: 30px; background: #f4f8fc; box-shadow: 0 26px 70px rgba(0, 0, 0, .38), 0 0 32px rgba(101, 229, 255, .1); }
.chain-demo-stage iframe { display: block; width: 100%; height: 800px; border: 0; background: #f4f8fc; }
.chain-module-heading { display: block; margin-bottom: 24px; }
.chain-module-heading > span { color: var(--chain-laser); font-size: 11px; font-weight: 700; letter-spacing: .16em; }
.chain-module-heading h3 { margin: 0; color: #fff; font-size: clamp(24px, 2.5vw, 34px); line-height: 1.25; }
.chain-module-heading p { margin: 0; color: rgba(211, 230, 244, .62); font-size: 14px; line-height: 1.8; }
.chain-gallery-grid { display: grid; gap: 14px; }
.chain-gallery-grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.chain-gallery-grid-3 .chain-gallery-item-1 { grid-column: span 2; min-height: 320px; }
.chain-gallery-grid-3 .chain-gallery-item-2, .chain-gallery-grid-3 .chain-gallery-item-3 { min-height: 228px; }
.chain-gallery-grid-routes { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.chain-gallery-grid-routes .chain-gallery-item { min-height: 270px; }
.chain-gallery-grid-routes .chain-gallery-item-1 { grid-column: auto; }
.chain-gallery-grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.chain-gallery-grid-4 .chain-gallery-item { min-height: 238px; }
.chain-gallery-grid-6 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.chain-gallery-grid-6 .chain-gallery-item { min-height: 214px; }
.chain-gallery-item { position: relative; margin: 0; overflow: hidden; border: 1px solid rgba(101, 229, 255, .17); border-radius: 3px 16px 3px 16px; background: #081827; }
.chain-gallery-item::before { position: absolute; z-index: 2; top: 12px; right: 12px; width: 24px; height: 24px; border-top: 1px solid var(--chain-cyan); border-right: 1px solid var(--chain-cyan); content: ""; opacity: .75; }
.chain-gallery-item::after { position: absolute; z-index: 1; inset: 0; background: linear-gradient(180deg, transparent 28%, rgba(2, 9, 18, .9)); content: ""; }
.chain-gallery-item img { display: block; width: 100%; height: 100%; object-fit: cover; filter: saturate(.9) contrast(1.05) brightness(.82); transition: transform .7s cubic-bezier(.2, .7, .2, 1), filter .4s ease; }
.chain-gallery-item:hover img { filter: saturate(1) contrast(1.03) brightness(.94); transform: scale(1.075); }
.chain-gallery-item figcaption { position: absolute; z-index: 3; right: 24px; bottom: 20px; left: 24px; display: grid; gap: 7px; }
.chain-gallery-item strong { color: #fff; font-size: 20px; }
.chain-gallery-item span { max-width: 560px; color: rgba(219, 238, 249, .72); font-size: 13px; line-height: 1.7; }
.chain-gallery-item-assist { border-color: rgba(139, 242, 199, .4); }
.chain-gallery-item-assist::before { border-color: #a7f8d5; }
.chain-gallery-item-shared { border-color: rgba(75, 223, 232, .4); }
.chain-gallery-item-shared::before { border-color: #70eefa; }
.chain-gallery-item-delivery { border-color: rgba(255, 159, 74, .5); }
.chain-gallery-item-delivery::before { border-color: #ffba75; }
.chain-logic-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin: 0; padding: 0; list-style: none; }
.chain-logic-grid li { position: relative; min-height: 174px; padding: 24px 20px; border: 1px solid rgba(101, 229, 255, .19); border-radius: 3px 14px 3px 14px; background: rgba(9, 29, 46, .68); }
.chain-logic-grid li:not(:last-child)::after { position: absolute; z-index: 2; top: 50%; right: -13px; width: 12px; height: 12px; border-top: 1px solid var(--chain-cyan); border-right: 1px solid var(--chain-cyan); background: #061525; content: ""; transform: translateY(-50%) rotate(45deg); }
.chain-logic-grid li > span { display: grid; place-items: center; width: 34px; height: 34px; border: 1px solid rgba(119, 255, 191, .44); border-radius: 2px; color: var(--chain-laser); font-size: 11px; font-weight: 700; box-shadow: 0 0 16px rgba(119, 255, 191, .12); }
.chain-logic-grid strong { display: block; margin: 28px 0 8px; color: #fff; font-size: 17px; }
.chain-logic-grid p { margin: 0; color: rgba(211, 230, 244, .62); font-size: 13px; line-height: 1.75; }
.chain-flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin: 0; }
.chain-flow-item { position: relative; min-height: 190px; padding: 28px 24px; border: 1px solid rgba(255, 255, 255, .13); border-radius: 14px; background: rgba(255, 255, 255, .06); }
.chain-flow-item::before { position: absolute; top: 0; left: 24px; width: 34px; height: 3px; background: var(--chain-green); content: ""; }
.chain-flow-item span { color: #a8f4d4; font-size: 12px; font-weight: 700; }
.chain-flow-item h3 { margin: 36px 0 8px; color: #fff; font-size: 18px; }
.chain-flow-item p { margin: 0; color: rgba(255, 255, 255, .64); font-size: 14px; line-height: 1.75; }


.footer { padding: 60px 40px 30px; background: #0b5cad; color: rgba(255, 255, 255, .78); }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(4, 1fr); gap: 40px; max-width: 1300px; margin: 0 auto; padding-bottom: 40px; border-bottom: 1px solid rgba(255, 255, 255, .1); }
.footer .brand-logo { content: url("assets/brand-logo-light.png?v=20260728-group14"); }
.footer-brand p { margin: 16px 0 0; font-size: 14px; line-height: 1.8; }
.footer-col h4 { margin: 0 0 20px; color: #fff; font-size: 16px; }
.footer-col ul { margin: 0; padding: 0; list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a, .footer-col a:visited, .footer-col a:hover, .footer-col a:active, .footer-bottom a { color: rgba(255, 255, 255, .6); font-size: 14px; text-decoration: none; white-space: normal; overflow-wrap: break-word; }
.footer-col a:hover { color: #fff; }
.footer-bottom { display: flex; align-items: center; flex-wrap: wrap; justify-content: space-between; gap: 16px; max-width: 1300px; margin: 0 auto; padding-top: 30px; color: rgba(255, 255, 255, .55); font-size: 13px; overflow-wrap: break-word; }
.footer-bottom p { margin: 0; }

[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .72s cubic-bezier(.2, .75, .25, 1), transform .72s cubic-bezier(.2, .75, .25, 1); transition-delay: calc(var(--reveal-index, 0) * 90ms); }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }
.chain-hero-visual[data-reveal] { transform: translateY(30px) perspective(900px) rotateX(var(--hero-rotate-x, 0deg)) rotateY(var(--hero-rotate-y, 0deg)); }
.chain-hero-visual[data-reveal].is-visible { transform: translateY(0) perspective(900px) rotateX(var(--hero-rotate-x, 0deg)) rotateY(var(--hero-rotate-y, 0deg)); }

@keyframes chain-scan { from { transform: translateY(0); } to { transform: translateY(420%); } }
@keyframes chain-node-boot { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
    [data-reveal] { opacity: 1; transform: none; }
}

@media (max-width: 980px) {
    .header { padding: 0 28px; }
    .footer-grid { grid-template-columns: repeat(3, 1fr); }
    .chain-hero, .chain-section { padding-right: 28px; padding-left: 28px; }
    .chain-hero-inner { grid-template-columns: minmax(0, .9fr) minmax(340px, 1.1fr); gap: 36px; }
    .chain-hero-visual { height: 330px; }
    .chain-page-nav-inner { padding-right: 28px; padding-left: 28px; }
    .chain-chain-grid { grid-template-columns: repeat(3, 1fr); }
    .chain-stage:nth-child(3) { border-right: 0; }
    .chain-stage:nth-child(-n + 3) { border-bottom: 1px solid var(--chain-line); }
    .chain-band-inner { gap: 36px; padding-right: 28px; padding-left: 28px; }
    .chain-band-sticky { grid-template-columns: minmax(250px, .85fr) minmax(0, 1.15fr); gap: 34px; }
    .chain-flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .chain-module-heading { grid-template-columns: 1fr 1fr; gap: 16px 28px; }
    .chain-module-heading > span { grid-column: span 2; }
    .chain-logic-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .chain-logic-grid li:nth-child(2)::after { display: none; }
    .chain-scene { grid-template-columns: 1fr 1fr; gap: 28px; }
    .chain-scene > div { padding: 26px 28px 26px 0; }
}

@media (max-width: 760px) {
    .header { padding: 0 20px; }
    .brand-logo { width: 150px; }
    .header-inner .logo { max-width: calc(100% - 120px); }
    .menu-toggle { display: block; flex-shrink: 0; padding: 6px; }
    .nav-menu { position: absolute; top: 72px; right: 0; left: 0; display: none; flex-direction: column; gap: 0; padding: 12px 20px 24px; background: #0b5cad; }
    .nav-menu.open { display: flex; }
    .nav-menu > li > a { padding: 10px 18px; color: #33483b !important;}
    .header.scrolled .nav-menu > li > a,
    .header.scrolled .nav-menu > li.active > a { color: #fff; }
    .header.scrolled .nav-menu > li > a:hover { color: #fff; background: rgba(255, 255, 255, .15); }
    .nav-menu .dropdown { position: static; padding: 0 0 8px 14px; background: transparent; box-shadow: none; }
    .nav-menu .dropdown a { color: rgba(255, 255, 255, .72); }
    .lang-switch { display: flex; flex-shrink: 0; }
    .chain-hero { min-height: 0; padding: 110px 20px 42px; }
    .chain-hero::before { top: 20%; right: -18%; width: 76vw; }
    .chain-hero-inner { grid-template-columns: 1fr; gap: 32px; }
    .chain-hero-copy { padding-bottom: 0; }
    .chain-hero h1 { font-size: 42px; }
    .chain-hero p { font-size: 15px; }
    .chain-hero-visual { height: 255px; border-radius: 14px; }
    .chain-hero-visual figcaption { right: 18px; bottom: 15px; left: 18px; font-size: 13px; }
    .chain-page-nav-inner { gap: 22px; padding: 12px 20px; }
    .chain-page-nav-inner > p { display: none; }
    .chain-node-list { min-width: 520px; }
    .chain-section { padding: 64px 20px 72px; }
    .chain-section::before { inset: 24px 20px; }
    .chain-chain-grid { grid-template-columns: 1fr; margin-top: 34px; }
    .chain-stage { min-height: 176px; padding: 24px; }
    .chain-stage:not(:last-child) { border-right: 0; border-bottom: 1px solid var(--chain-line); }
    .chain-stage h3 { margin-top: 24px; }
    .chain-stage-arrow { top: auto; right: 26px; bottom: -11px; transform: rotate(90deg); }
    .chain-band-inner { grid-template-columns: 1fr; gap: 32px; padding: 64px 20px; }
    .chain-band-sticky { grid-template-columns: 1fr; gap: 16px; }
    .chain-detail-grid, .chain-flow { grid-template-columns: 1fr; margin-top: 20px; }
    .chain-gallery-block, .chain-logic-block { margin-top: 56px; }
    .chain-module-heading { grid-template-columns: 1fr; gap: 10px; margin-bottom: 18px; }
    .chain-module-heading > span { grid-column: auto; }
    .chain-gallery-grid-3, .chain-gallery-grid-4, .chain-gallery-grid-6, .chain-gallery-grid-routes { grid-template-columns: 1fr; }
    .chain-gallery-grid-3 .chain-gallery-item-1 { grid-column: auto; min-height: 248px; }
    .chain-gallery-grid-3 .chain-gallery-item-2, .chain-gallery-grid-3 .chain-gallery-item-3, .chain-gallery-grid-4 .chain-gallery-item, .chain-gallery-grid-6 .chain-gallery-item, .chain-gallery-grid-routes .chain-gallery-item { min-height: 208px; }
    .chain-gallery-item figcaption { right: 18px; bottom: 16px; left: 18px; }
    .chain-gallery-item strong { font-size: 18px; }
    .chain-demo-section { padding-top: 58px; padding-bottom: 68px; }
    .chain-demo-inner { grid-template-columns: 1fr; gap: 34px; }
    .chain-demo-inner-only { display: block; }
    .chain-demo-stage { max-width: 100%; }
    .chain-demo-stage iframe { height: 760px; }
    .chain-logic-grid { grid-template-columns: 1fr; gap: 12px; }
    .chain-logic-grid li { min-height: 0; padding: 22px 20px; }
    .chain-logic-grid li:not(:last-child)::after { top: auto; right: auto; bottom: -8px; left: 26px; transform: rotate(135deg); }
    .chain-logic-grid strong { margin-top: 20px; }
    .chain-scene { grid-template-columns: 1fr; gap: 0; margin-top: 34px; }
    .chain-scene figure, .chain-scene img { min-height: 230px; }
    .chain-scene > div { padding: 28px 24px 30px; }
    .chain-scene h3 { margin-top: 18px; font-size: 25px; }
    .chain-detail-card { min-height: 0; }
    .footer { padding: 48px 20px 26px; }
    .footer-grid { grid-template-columns: 1fr; gap: 26px; padding-bottom: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

/* 暖白薄荷主题覆盖 */
body { color: var(--chain-ink); background: #f7f9f5; }
.chain-shell { background: radial-gradient(circle at 82% 14%, rgba(203, 232, 207, 0.6), transparent 28%), #f7f9f5; }
.header { background: rgba(255, 255, 252, 0.82); box-shadow: 0 2px 20px rgba(48, 70, 58, 0.08); }
.header:not(.scrolled) .brand-logo { content: url("assets/brand-logo.png?v=20260728-group14"); }
.header:not(.scrolled) .nav-menu > li > a,
.header.scrolled .nav-menu > li > a { color: var(--chain-ink); }
.header:not(.scrolled) .nav-menu > li > a:hover,
.header:not(.scrolled) .nav-menu > li.active > a,
.header.scrolled .nav-menu > li > a:hover,
.header.scrolled .nav-menu > li.active > a { color: var(--chain-ink); background: rgba(36, 18, 46, 0.08); }
.header:not(.scrolled) .lang-switch,
.header.scrolled .lang-switch { color: var(--chain-ink); border-color: rgba(48, 70, 58, 0.2); }
.header:not(.scrolled) .menu-toggle span,
.header.scrolled .menu-toggle span { background: var(--chain-ink); }
.chain-hero { color: var(--chain-ink); background: radial-gradient(circle at 88% 14%, rgba(185, 229, 194, 0.8), transparent 25%), radial-gradient(circle at 14% 82%, rgba(223, 239, 222, 0.9), transparent 34%), linear-gradient(130deg, #fffefb 2%, #eef6ed 54%, #e4f0e2 120%); }
.chain-hero::before { border-color: rgba(112, 174, 134, 0.24); box-shadow: 0 0 0 52px rgba(112, 174, 134, 0.055), 0 0 0 104px rgba(112, 174, 134, 0.035); }
.chain-hero::after { opacity: 0.55; background-image: linear-gradient(rgba(112, 174, 134, 0.14) 1px, transparent 1px), linear-gradient(90deg, rgba(112, 174, 134, 0.14) 1px, transparent 1px); }
.chain-eyebrow { color: #5b9270; }
.chain-hero h1 { color: var(--chain-ink); text-shadow: none; }
.chain-hero p { color: #607469; }
.chain-page-nav { background: #f4f8f2; border-color: rgba(79, 144, 100, 0.28); }
.chain-page-nav-inner > p { color: #7301FF; }
.chain-node-list a { color: var(--chain-muted); }
.chain-node-list li:not(:last-child)::after { background: rgba(79, 144, 100, 0.28); }
.chain-node-number { border-color: rgba(112, 174, 134, 0.46); background: #fff; color: #5b9270; }
.chain-node-list a:hover, .chain-node-list li.active a { color: var(--chain-ink); }
.chain-section::before { border-color: rgba(112, 174, 134, 0.14); background-image: linear-gradient(rgba(112, 174, 134, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(112, 174, 134, 0.06) 1px, transparent 1px); }
.chain-section-title { color: var(--chain-ink); }
.chain-section-lead { color: var(--chain-muted); }
.chain-module-heading h3 { color: var(--chain-ink); }
.chain-module-heading p { color: var(--chain-muted); }
.chain-band { border-color: rgba(112, 174, 134, 0.34); background: linear-gradient(125deg, #5c8064 4%, #83ac89 56%, #a7c9a5 120%); }
.chain-detail-card { border-color: rgba(112, 174, 134, 0.24); background: #fff; box-shadow: 0 8px 22px rgba(74, 109, 80, 0.1); }
.chain-detail-card h3, .chain-detail-card p { color: var(--chain-ink); }
.chain-logic-grid li { border-color: rgba(112, 174, 134, 0.25); background: #fff; }
.chain-logic-grid strong { color: var(--chain-ink); }
.chain-logic-grid p { color: var(--chain-muted); }
.chain-logic-grid li:not(:last-child)::after { background: #f7f9f5; border-color: var(--chain-green); }
.footer { color: var(--chain-muted); background: #f1f1f1; }
.footer-grid { border-bottom-color: rgba(48, 70, 58, 0.12); }
.footer .brand-logo { content: url("assets/brand-logo.png?v=20260728-group14"); }
.footer-col h4 { color: var(--chain-ink); }
.footer-col a, .footer-col a:visited, .footer-col a:hover, .footer-col a:active, .footer-bottom a { color: var(--chain-muted); }
.footer-col a:hover { color: var(--chain-ink); }
.footer-bottom { color: var(--chain-muted); }
@media (max-width: 760px) { .nav-menu { background: #fffefb; } .nav-menu .dropdown a { color: var(--chain-muted); } }

/* 精简场景展示：以图片为主，各页面保留不同的信息节奏。 */
.chain-section-scenarios-only { padding-top: 78px; }
.chain-hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin: 24px 0 0; padding: 0; list-style: none; }
.chain-hero-tags li { padding: 7px 12px; border: 1px solid rgba(79, 144, 100, .3); border-radius: 999px; color: #7301FF; background: rgba(255, 255, 255, .68); font-size: 13px; font-weight: 600; }
.chain-section-intro { display: grid; grid-template-columns: minmax(280px, .8fr) minmax(0, 1.2fr); gap: 42px; align-items: end; max-width: 1200px; margin: 0 auto; }
.chain-section-intro .chain-section-title { margin: 0; }
.chain-section-intro .chain-section-lead { margin: 0; }
.chain-gallery-grid-production { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.chain-gallery-grid-production .chain-gallery-item { min-height: 245px; }
.chain-gallery-grid-storage { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.chain-gallery-grid-storage .chain-gallery-item { min-height: 255px; }
.chain-gallery-grid-storage .chain-gallery-item-1 { grid-column: auto; }
.chain-gallery-grid-transport { grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); align-items: stretch; }
.chain-gallery-grid-transport .chain-gallery-item { min-height: 360px; }
.chain-gallery-grid-refueling { grid-template-columns: 1fr; }
.chain-gallery-grid-refueling .chain-gallery-item { min-height: 420px; }
.chain-gallery-grid-refueling .chain-gallery-item img { object-position: center 54%; }
.chain-shell-storage .chain-hero-inner { grid-template-columns: 1fr; }
.chain-shell-storage .chain-hero-copy { max-width: 760px; }
.chain-shell-storage .chain-hero-visual { width: 100%; height: clamp(340px, 36vw, 480px); }

@media (max-width: 760px) {
    .chain-section-scenarios-only { padding-top: 60px; }
    .chain-section-scenarios-only .chain-gallery-block { margin-top: 32px; }
    .chain-hero-tags { gap: 8px; margin-top: 18px; }
    .chain-hero-tags li { padding: 6px 10px; font-size: 12px; }
    .chain-section-intro { grid-template-columns: 1fr; gap: 14px; }
    .chain-gallery-grid-production,
    .chain-gallery-grid-storage,
    .chain-gallery-grid-transport,
    .chain-gallery-grid-refueling { grid-template-columns: 1fr; }
    .chain-gallery-grid-production .chain-gallery-item,
    .chain-gallery-grid-storage .chain-gallery-item,
    .chain-gallery-grid-transport .chain-gallery-item,
    .chain-gallery-grid-refueling .chain-gallery-item { min-height: 220px; }
    .chain-shell-storage .chain-hero-visual { height: 230px; }
}

/* 解决方案内容区重构 */
.solution-content { margin-top: 72px; padding: 0 40px 112px; background: #f7f9f5; color: #20352a; }
.solution-intro { display: grid; grid-template-columns: minmax(170px, .45fr) minmax(0, 1.55fr); gap: 36px; width: min(1200px, 100%); margin: 0 auto; padding: 88px 0 54px; border-bottom: 1px solid rgba(48, 70, 58, .16); }
.solution-intro > span { padding-top: 12px; color: #5b9270; font-size: 12px; font-weight: 700; letter-spacing: .12em; }
.solution-intro h1 { margin: 0 0 16px; color: #20352a; font-size: clamp(42px, 5vw, 68px); line-height: 1; letter-spacing: -.045em; }
.solution-intro p { max-width: 660px; margin: 0; color: #607469; font-size: 16px; line-height: 1.9; }
.solution-copy, .solution-storage-head { width: min(1200px, 100%); margin: 0 auto; }
.solution-copy { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr); gap: 54px; padding: 52px 0 30px; align-items: start; }
.solution-copy h2, .solution-storage-head h2, .transport-copy h2, .refueling-stage h2 { margin: 0; color: #20352a; font-size: clamp(28px, 3vw, 40px); line-height: 1.3; letter-spacing: -.025em; }
.solution-copy p, .solution-storage-head p, .transport-copy p { max-width: 660px; margin: 0; color: #607469; font-size: 15px; line-height: 1.9; }
.solution-card-grid { display: grid; width: min(1200px, 100%); margin: 0 auto; }
.solution-card { overflow: hidden; background: #fff; border: 1px solid rgba(48, 70, 58, .12); border-radius: 16px; box-shadow: 0 10px 28px rgba(65, 91, 73, .08); }
.solution-card img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; }
.solution-card > div { padding: 22px 22px 24px; }
.solution-card h3 { margin: 0 0 9px; color: #20352a; font-size: 19px; line-height: 1.35; }
.solution-card p { margin: 0; color: #607469; font-size: 13px; line-height: 1.75; }
.solution-card-grid-production { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.solution-card-grid-production .solution-card:first-child { grid-column: span 2; }
.solution-card-grid-production .solution-card:first-child img { aspect-ratio: 16 / 8; }
.solution-storage { background: #f1f5ef; }
.solution-storage-head { display: flex; align-items: end; justify-content: space-between; gap: 54px; padding: 54px 0 28px; }
.solution-card-grid-storage { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.solution-transport { background: #f7f9f5; }
.transport-layout { display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(300px, .7fr); grid-template-areas: "copy sea" "road sea"; gap: 18px; width: min(1200px, 100%); margin: 0 auto; padding-top: 54px; }
.transport-copy { grid-area: copy; display: grid; grid-template-columns: minmax(220px, .8fr) minmax(0, 1.2fr); gap: 32px; align-items: end; padding-bottom: 16px; }
.transport-copy span { grid-column: 2; color: #5b9270; font-size: 12px; font-weight: 700; letter-spacing: .1em; }
.transport-road, .transport-maritime { position: relative; overflow: hidden; border-radius: 16px; min-height: 430px; background: #18362b; }
.transport-road { grid-area: road; }
.transport-maritime { grid-area: sea; }
.transport-road img, .transport-maritime img { display: block; width: 100%; height: 100%; object-fit: cover; }
.transport-road::after, .transport-maritime::after { position: absolute; inset: 0; background: linear-gradient(180deg, transparent 42%, rgba(10, 29, 22, .86)); content: ""; }
.transport-road > div, .transport-maritime > div { position: absolute; z-index: 1; right: 26px; bottom: 24px; left: 26px; color: #fff; }
.transport-road strong, .transport-maritime strong { color: #a7e0b4; font-size: 12px; letter-spacing: .12em; }
.transport-road h3, .transport-maritime h3 { margin: 9px 0 7px; font-size: 24px; }
.transport-road p, .transport-maritime p { max-width: 500px; margin: 0; color: rgba(255, 255, 255, .78); font-size: 13px; line-height: 1.75; }
.solution-refueling { padding-bottom: 0; }
.refueling-stage { position: relative; width: min(1200px, 100%); min-height: 520px; margin: 54px auto 0; overflow: hidden; border-radius: 18px 18px 0 0; background: #19372c; }
.refueling-stage > img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.refueling-stage::after { position: absolute; inset: 0; background: linear-gradient(90deg, rgba(13, 42, 31, .92) 0%, rgba(13, 42, 31, .62) 46%, rgba(13, 42, 31, .06) 78%); content: ""; }
.refueling-stage > div { position: relative; z-index: 1; width: min(530px, 100%); padding: 90px 56px; color: #fff; }
.refueling-stage > div > span { display: block; margin-bottom: 20px; color: #bcebc3; font-size: 12px; font-weight: 700; letter-spacing: .15em; }
.refueling-stage h2 { color: #fff; }
.refueling-stage p { margin: 18px 0 28px; color: rgba(255, 255, 255, .82); font-size: 15px; line-height: 1.85; }
.refueling-stage ul { display: flex; flex-wrap: wrap; gap: 10px; margin: 0; padding: 0; list-style: none; }
.refueling-stage li { padding: 8px 12px; border: 1px solid rgba(219, 255, 222, .38); border-radius: 999px; color: #fff; font-size: 13px; }
.solution-copy-use { padding-bottom: 28px; }
.solution-card-grid-use { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.solution-card-grid-use .solution-card img { aspect-ratio: 16 / 9; }
@media (max-width: 900px) {
  .solution-content { padding-right: 28px; padding-left: 28px; }
  .solution-card-grid-production { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .solution-card-grid-production .solution-card:first-child { grid-column: auto; }
  .solution-card-grid-production .solution-card:first-child img { aspect-ratio: 16 / 10; }
  .transport-layout { grid-template-columns: 1fr; grid-template-areas: "copy" "road" "sea"; }
  .transport-copy { grid-template-columns: 1fr; gap: 14px; }
  .transport-copy span { grid-column: auto; }
  .transport-road, .transport-maritime { min-height: 350px; }
}
@media (max-width: 640px) {
  .solution-content { margin-top: 72px; padding: 0 20px 68px; }
  .solution-intro { grid-template-columns: 1fr; gap: 12px; padding: 54px 0 34px; }
  .solution-intro > span { padding-top: 0; }
  .solution-intro h1 { font-size: 42px; }
  .solution-intro p { font-size: 14px; line-height: 1.8; }
  .solution-copy, .solution-storage-head { display: grid; grid-template-columns: 1fr; gap: 14px; padding: 36px 0 22px; }
  .solution-copy h2, .solution-storage-head h2, .transport-copy h2, .refueling-stage h2 { font-size: 27px; }
  .solution-copy p, .solution-storage-head p, .transport-copy p { font-size: 14px; line-height: 1.8; }
  .solution-card-grid-production, .solution-card-grid-storage, .solution-card-grid-use { grid-template-columns: 1fr; gap: 14px; }
  .solution-card > div { padding: 18px 18px 20px; }
  .transport-layout { padding-top: 36px; }
  .transport-road, .transport-maritime { min-height: 280px; }
  .transport-road > div, .transport-maritime > div { right: 18px; bottom: 18px; left: 18px; }
  .transport-road h3, .transport-maritime h3 { font-size: 21px; }
  .refueling-stage { min-height: 440px; margin-top: 36px; border-radius: 14px 14px 0 0; }
  .refueling-stage::after { background: linear-gradient(180deg, rgba(13, 42, 31, .84) 0%, rgba(13, 42, 31, .55) 100%); }
  .refueling-stage > div { padding: 48px 26px; }
}

/* 解决方案统一版式：去除早期深色科技风，保留图片与内容本身。 */
.chain-shell {
    background: #fff !important; 
    color: var(--chain-ink);
}
.chain-shell .header {
    background: rgba(255, 255, 255, .96);
    box-shadow: 0 1px 0 rgba(32, 53, 42, .09);
}
.chain-shell .brand-logo,
.chain-shell .header:not(.scrolled) .brand-logo {
    content: url("assets/brand-logo.png?v=20260801-solutions-clean");
}
.chain-shell .nav-menu > li > a,
.chain-shell .header:not(.scrolled) .nav-menu > li > a,
.chain-shell .header.scrolled .nav-menu > li > a {
    color: #33483b;
}
.chain-shell .nav-menu > li > a:hover,
.chain-shell .nav-menu > li.active > a,
.chain-shell .header.scrolled .nav-menu > li > a:hover,
.chain-shell .header.scrolled .nav-menu > li.active > a {
    color: #264d35;
    background: #f5edff;
}
.chain-shell .lang-switch,
.chain-shell .header.scrolled .lang-switch {
    border-color: rgba(48, 70, 58, .2);
    color: #526759;
}
.chain-shell .menu-toggle span,
.chain-shell .header.scrolled .menu-toggle span { background: #33483b; }
.chain-hero-clean {
    min-height: 0;
    padding: 174px 40px 82px;
    color: var(--chain-ink);
    background: #fff;
}
.chain-hero-clean::before,
.chain-hero-clean::after { display: none; }
.chain-hero-clean .chain-hero-inner {
    display: block;
    max-width: 1200px;
}
.chain-hero-clean .chain-hero-copy {
    max-width: 720px;
    padding: 0;
}
.chain-hero-index,
.chain-section-intro > span {
    display: block;
    margin-bottom: 20px;
    color: #6c9074;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .16em;
}
.chain-hero-clean h1 {
    margin: 0;
    color: #20352a;
    font-size: clamp(48px, 5vw, 68px);
    font-weight: 500;
    line-height: 1.05;
    letter-spacing: -.055em;
}
.chain-hero-clean p {
    max-width: 570px;
    margin: 22px 0 0;
    color: #607469;
    font-size: 16px;
    line-height: 1.9;
}
.chain-section-scenarios-only {
    padding: 0 40px 110px;
    background: #f6f8f4;
}
.chain-section-scenarios-only::before { display: none; }
.chain-section-intro {
    display: grid;
    grid-template-columns: minmax(180px, .42fr) minmax(0, 1.58fr);
    gap: 34px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 70px 0 42px;
    border-bottom: 1px solid rgba(48, 70, 58, .13);
}
.chain-section-intro > span { margin: 8px 0 0; }
.chain-section-intro .chain-section-title {
    max-width: 670px;
    margin: 0;
    color: #20352a;
    font-size: clamp(29px, 3.2vw, 42px);
    font-weight: 500;
    line-height: 1.32;
    letter-spacing: -.035em;
}
.chain-section-intro .chain-section-lead {
    max-width: 600px;
    margin: 14px 0 0;
    color: #607469;
    font-size: 15px;
    line-height: 1.9;
}
.chain-gallery-block {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 34px;
}
.chain-module-heading {
    display: block;
    margin: 0 0 18px;
}
.chain-module-heading h3 {
    margin: 0;
    color: #53695b;
    font-size: 14px;
    font-weight: 500;
}
.chain-gallery-grid,
.chain-gallery-grid-production,
.chain-gallery-grid-storage,
.chain-gallery-grid-transport,
.chain-gallery-grid-refueling {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
    align-items: start;
}
.chain-gallery-grid-production { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.chain-gallery-grid-transport { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.chain-gallery-grid-refueling { grid-template-columns: minmax(0, 1fr); }
.chain-gallery-item,
.chain-gallery-grid-production .chain-gallery-item,
.chain-gallery-grid-storage .chain-gallery-item,
.chain-gallery-grid-transport .chain-gallery-item,
.chain-gallery-grid-refueling .chain-gallery-item {
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow: hidden;
    border: 1px solid rgba(48, 70, 58, .13);
    border-radius: 0;
    background: #fff;
    box-shadow: none;
}
.chain-gallery-item::before { display: none; }
.chain-gallery-item img {
    display: block;
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    filter: none;
    transform: none;
}
.chain-gallery-grid-refueling .chain-gallery-item img { aspect-ratio: 21 / 9; object-position: center; }
.chain-gallery-item:hover img { transform: none; }
.chain-gallery-item figcaption {
    position: static;
    display: block;
    flex: 1;
    padding: 17px 18px 19px;
    background: #fff;
    color: var(--chain-ink);
}
.chain-gallery-item strong {
    display: block;
    margin: 0;
    color: #263f30;
    font-size: 17px;
    font-weight: 500;
    line-height: 1.4;
}
.chain-gallery-item span {
    display: block;
    margin-top: 7px;
    color: #718075;
    font-size: 13px;
    line-height: 1.7;
}
@media (max-width: 760px) {
    .chain-hero-clean { padding: 128px 20px 52px; }
    .chain-hero-clean h1 { font-size: 44px; }
    .chain-hero-clean p { font-size: 14px; }
    .chain-section-scenarios-only { padding: 0 20px 64px; }
    .chain-section-intro { grid-template-columns: 1fr; gap: 10px; padding: 42px 0 28px; }
    .chain-section-intro > span { margin: 0; }
    .chain-section-intro .chain-section-title { font-size: 28px; }
    .chain-section-intro .chain-section-lead { font-size: 14px; }
    .chain-gallery-block { padding-top: 25px; }
    .chain-gallery-grid,
    .chain-gallery-grid-production,
    .chain-gallery-grid-storage,
    .chain-gallery-grid-transport,
    .chain-gallery-grid-refueling { grid-template-columns: 1fr; gap: 14px; }
    .chain-gallery-grid-refueling .chain-gallery-item img { aspect-ratio: 16 / 10; }
}

/* 产品详情页：参考产品目录与详情切换，避免专题页式图片堆叠。 */
.product-section {
    padding: 0 40px 112px;
    background: #f6f8f4;
}
.product-section-heading {
    width: min(1200px, 100%);
    margin: 0 auto;
    padding: 70px 0 40px;
    border-bottom: 1px solid rgba(48, 70, 58, .13);
}
.product-section-heading > span {
    display: block;
    margin-bottom: 16px;
    color: #6c9074;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: .15em;
}
.product-section-heading h2 {
    max-width: 720px;
    margin: 0;
    color: #20352a;
    font-size: clamp(29px, 3.2vw, 42px);
    font-weight: 500;
    line-height: 1.32;
    letter-spacing: -.035em;
}
.product-section-heading p {
    max-width: 620px;
    margin: 14px 0 0;
    color: #607469;
    font-size: 15px;
    line-height: 1.9;
}
.product-detail-layout {
    display: grid;
    grid-template-columns: 250px minmax(0, 1fr);
    gap: 52px;
    width: min(1200px, 100%);
    margin: 0 auto;
    padding-top: 38px;
}
.product-directory {
    align-self: start;
    border-top: 1px solid rgba(48, 70, 58, .26);
}
.product-directory > p {
    margin: 0;
    padding: 16px 0;
    border-bottom: 1px solid rgba(48, 70, 58, .13);
    color: #506657;
    font-size: 13px;
}
.product-directory-list { display: grid; }
.product-directory-item {
    display: grid;
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
    width: 100%;
    padding: 17px 0;
    border: 0;
    border-bottom: 1px solid rgba(48, 70, 58, .13);
    background: transparent;
    color: #557060;
    text-align: left;
    cursor: pointer;
    transition: color .2s ease, padding-left .2s ease;
}
.product-directory-item span {
    color: #91a398;
    font-size: 12px;
    line-height: 1.5;
}
.product-directory-item strong {
    font-size: 15px;
    font-weight: 400;
    line-height: 1.5;
}
.product-directory-item:hover,
.product-directory-item.is-active {
    padding-left: 8px;
    color: #204d33;
}
.product-directory-item.is-active strong { font-weight: 600; }
.product-directory-item.is-active span { color: #5e996f; }
.product-detail-panel {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr);
    min-height: 420px;
    border: 1px solid rgba(48, 70, 58, .13);
    background: #fff;
}
.product-detail-visual {
    min-height: 420px;
    margin: 0;
    overflow: hidden;
    background: #e7ece5;
}
.product-detail-visual img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 1;
    transition: opacity .12s ease;
}
.product-detail-visual img[src*="soc-high-temperature-electrolysis"] {
    object-fit: contain;
}
.product-detail-visual img.is-changing { opacity: .32; }
.product-detail-copy {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 42px 38px 34px;
}
.product-detail-index {
    color: #6d9876;
    font-size: 12px;
    letter-spacing: .12em;
}
.product-detail-copy h3 {
    margin: 22px 0 14px;
    color: #20352a;
    font-size: clamp(27px, 2.4vw, 34px);
    font-weight: 500;
    line-height: 1.28;
    letter-spacing: -.035em;
}
.product-detail-copy > p {
    margin: 0;
    color: #637369;
    font-size: 14px;
    line-height: 1.9;
}
.product-detail-meta {
    display: grid;
    gap: 13px;
    width: 100%;
    margin: 31px 0 0;
}
.product-detail-meta div {
    display: grid;
    grid-template-columns: 74px minmax(0, 1fr);
    gap: 12px;
    padding-top: 13px;
    border-top: 1px solid rgba(48, 70, 58, .12);
}
.product-detail-meta dt { color: #8a9a8e; font-size: 12px; }
.product-detail-meta dd { margin: 0; color: #475c4d; font-size: 12px; line-height: 1.6; }
.product-detail-controls {
    display: flex;
    gap: 8px;
    margin-top: auto;
    padding-top: 28px;
}
.product-control {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;
    border: 1px solid rgba(48, 70, 58, .23);
    background: #fff;
    color: #355140;
    font-size: 18px;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease;
}
.product-control:hover { border-color: #5b9270; background: #edf4ed; }
@media (max-width: 900px) {
    .product-detail-layout { grid-template-columns: 1fr; gap: 28px; }
    .product-directory-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .product-directory-item { border-top: 1px solid rgba(48, 70, 58, .13); }
}
@media (max-width: 760px) {
    .product-section { padding: 0 20px 68px; }
    .product-section-heading { padding: 42px 0 28px; }
    .product-section-heading h2 { font-size: 28px; }
    .product-section-heading p { font-size: 14px; }
    .product-detail-layout { padding-top: 24px; }
    .product-directory-list { grid-template-columns: 1fr; }
    .product-detail-panel { grid-template-columns: 1fr; min-height: 0; }
    .product-detail-visual { min-height: 250px; }
    .product-detail-copy { padding: 28px 22px 24px; }
    .product-detail-copy h3 { margin-top: 18px; font-size: 27px; }
    .product-detail-meta { margin-top: 24px; }
}

/* 统一产品中心：横幅 + 分类 Tab + 产品列表 / 详情视图。 */
.solution-center-shell { background: #f5f6f3; }
/* 产品中心头部：顶部透明（叠加在视频上），滚动后变白底，与首页一致 */
/* 提高选择器权重（chain-shell.solution-center-shell .header），确保覆盖全局暖白主题 .header */
.chain-shell.solution-center-shell .header {
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.6), transparent) !important;
    box-shadow: none !important;
    transition: background .3s ease, box-shadow .3s ease;
}
.chain-shell.solution-center-shell .header.scrolled {
    background: rgba(255, 255, 255, .98) !important;
    box-shadow: 0 2px 20px rgba(0, 0, 0, .08) !important;
    backdrop-filter: blur(10px);
}
.chain-shell.solution-center-shell .header:not(.scrolled) .brand-logo { content: url("assets/brand-logo-light.png?v=20260801-solution-center-15"); }
.chain-shell.solution-center-shell .brand-logo { content: url("assets/brand-logo.png?v=20260801-solution-center-13"); }
.chain-shell.solution-center-shell .header:not(.scrolled) .nav-menu > li > a,
.chain-shell.solution-center-shell .header:not(.scrolled) .nav-menu > li.active > a { color: #fff; }
.chain-shell.solution-center-shell .nav-menu > li > a,
.chain-shell.solution-center-shell .nav-menu > li.active > a { color: #33483b; }
.chain-shell.solution-center-shell .nav-menu > li > a:hover,
.chain-shell.solution-center-shell .nav-menu > li.active > a { color: #214a32; background: rgba(255, 255, 255, 0.15); }
.chain-shell.solution-center-shell .header:not(.scrolled) .lang-switch { border-color: rgba(255, 255, 255, .45); color: #fff; }
.chain-shell.solution-center-shell .lang-switch { border-color: rgba(48, 70, 58, .2); color: #526759; }
.chain-shell.solution-center-shell .header:not(.scrolled) .menu-toggle span { background: #fff; }
.chain-shell.solution-center-shell .menu-toggle span { background: #33483b; }
.solution-center-hero { --hero-height: max(100vh, 600px); position: relative; height: var(--hero-height); overflow: hidden; background: #1c3428; }
.solution-center-hero::after { position: absolute; z-index: 1; inset: 0; background: linear-gradient(90deg, rgba(12, 35, 24, .79) 0%, rgba(14, 49, 31, .63) 31%, rgba(16, 38, 26, .18) 59%, rgba(16, 38, 26, .08) 100%); content: ""; }
.solution-center-hero img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center 72%; }
.solution-center-hero-video { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 60%; background: #1c3428; opacity: 0; transition: opacity .6s ease; }
.solution-center-hero-video.is-active { opacity: 1; }
.solution-center-brand-mark { position: absolute; z-index: 2; top: 50%; right: max(34px, calc((100% - 1200px) / 2 - 18px)); display: grid; width: clamp(180px, 18vw, 270px); aspect-ratio: 1; place-items: center; border: 1px solid rgba(180, 242, 203, .17); border-radius: 50%; background: radial-gradient(circle, rgba(70, 202, 113, .15), rgba(36, 90, 54, .03) 65%, transparent 66%); opacity: .52; transform: translateY(-50%); }
.solution-center-brand-mark::before { position: absolute; inset: 13%; border: 1px solid rgba(183, 244, 203, .12); border-radius: inherit; content: ""; }
.solution-center-brand-mark img { position: relative; z-index: 1; width: 43%; height: auto; opacity: .9; filter: saturate(.78) brightness(1.45); }
.solution-center-hero-copy { position: absolute; z-index: 3; top: 52%; left: max(40px, calc((100% - 1200px) / 2)); width: min(430px, calc(100% - 80px)); color: #fff; transform: translateY(-50%); }
.solution-center-wordmark { display: block; width: min(172px, 58%); height: auto; margin: 0 0 30px; object-fit: contain; object-position: left center; filter: brightness(0) invert(1); opacity: .95; }
.solution-center-hero-copy > span { display: block; margin-bottom: 18px; color: rgba(255, 255, 255, .8); font-size: 12px; font-weight: 600; letter-spacing: .18em; }
.solution-center-hero h1 { margin: 0; color: #fff; font-size: clamp(46px, 5vw, 68px); font-weight: 500; line-height: 1.08; letter-spacing: -.06em; }
.solution-center-hero p { max-width: 390px; margin: 20px 0 0; color: rgba(255, 255, 255, .86); font-size: 15px; line-height: 1.9; }

/* 首屏底部滚动提示（示意用户可下滑） */
.solution-center-scroll-hint {
    position: absolute;
    z-index: 3;
    left: 50%;
    bottom: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, .92);
    text-decoration: none;
    cursor: pointer;
    animation: solutionScrollFloat 2s ease-in-out infinite;
}
.solution-center-scroll-hint .scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(255, 255, 255, .85);
    border-radius: 14px;
    position: relative;
}
.solution-center-scroll-hint .scroll-wheel {
    position: absolute;
    top: 7px;
    left: 50%;
    width: 4px;
    height: 8px;
    margin-left: -2px;
    border-radius: 2px;
    background: rgba(255, 255, 255, .95);
    animation: solutionScrollWheel 1.6s ease-in-out infinite;
}
.solution-center-scroll-hint .scroll-text {
    font-size: 12px;
    letter-spacing: .22em;
    text-shadow: 0 1px 4px rgba(0, 0, 0, .35);
}
.solution-center-scroll-hint:hover .scroll-mouse { border-color: #fff; }
.solution-center-scroll-hint:hover .scroll-text { color: #fff; }
@keyframes solutionScrollFloat {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}
@keyframes solutionScrollWheel {
    0% { transform: translateY(0); opacity: 1; }
    70% { transform: translateY(11px); opacity: .15; }
    100% { transform: translateY(0); opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
    .solution-center-scroll-hint { animation: none; }
    .solution-center-scroll-hint .scroll-wheel { animation: none; }
}

/* 移动端竖屏：旋转手机提示遮罩（与首页一致） */
.solution-rotate-hint {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2500;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 26px;
    padding: 32px;
    text-align: center;
    background: radial-gradient(circle at 50% 38%, rgba(10, 38, 30, 0.96), rgba(3, 12, 20, 0.98));
    color: #eafff7;
    opacity: 1;
    visibility: visible;
    transition: opacity .45s ease, visibility 0s linear 0s;
}
/* 点击「一键进入横屏」后平滑淡出，体验更丝滑 */
.solution-rotate-hint.is-hiding { opacity: 0; visibility: hidden; pointer-events: none; transition: opacity .45s ease, visibility 0s linear .45s; }
.solution-rotate-hint .rotate-hint-phone { width: 84px; height: 84px; color: #7301FF; animation: rotate-hint-rotate 2.6s ease-in-out infinite; }
.solution-rotate-hint .rotate-hint-phone svg { width: 100%; height: 100%; }
@keyframes rotate-hint-rotate {
    0%, 18% { transform: rotate(0deg); }
    45%, 70% { transform: rotate(-90deg); }
    100% { transform: rotate(0deg); }
}
.solution-rotate-hint .rotate-hint-title { margin: 0 0 8px; font-size: 17px; font-weight: 700; letter-spacing: 0.04em; }
.solution-rotate-hint .rotate-hint-sub { margin: 0; font-size: 13px; line-height: 1.6; color: rgba(255, 255, 255, 0.72); }
.solution-rotate-hint .rotate-hint-btn { margin-top: 22px; padding: 12px 30px; border: 1px solid rgba(115, 1, 255, 0.7); border-radius: 999px; color: #fff; font-size: 15px; font-weight: 700; letter-spacing: 0.06em; background: linear-gradient(135deg, #7301FF, #7301FF); cursor: pointer; }
.solution-rotate-hint .rotate-hint-btn:active { transform: translateY(-2px); filter: brightness(1.06); }

/* 移动端竖屏：hero 正常竖屏显示，并弹出旋转提示遮罩；用户旋转手机后由横屏媒体查询接管 */
@media (max-width: 760px) and (orientation: portrait) {
    .solution-center-hero {
        position: relative;
        top: auto;
        left: auto;
        width: 100%;
        height: 100svh;
        min-height: 100svh;
        --hero-height: 100svh;
        transform: none;
        transform-origin: center;
    }
    .solution-center-hero-video { object-fit: cover; background: #142b20; }
    .solution-center-hero-copy { top: 50%; left: 24px; width: calc(100% - 48px); transform: translateY(-50%); }
    .solution-center-wordmark { width: 120px; margin-bottom: 16px; }
    .solution-center-hero-copy > span { font-size: 10px; margin-bottom: 10px; }
    .solution-center-hero h1 { font-size: clamp(30px, 8vw, 48px); }
    .solution-center-hero p { max-width: 320px; margin-top: 10px; font-size: 13px; line-height: 1.75; }
    .solution-center-brand-mark { width: 90px; right: 14px; opacity: .35; }
    .solution-center-scroll-hint { display: none; }
    .solution-rotate-hint { display: flex; }
}

/* 移动端横屏：复用桌面全屏 hero 布局，视频铺满 */
@media (orientation: landscape) and (max-height: 500px) {
    .solution-rotate-hint { display: none !important; }
    .solution-center-hero { width: 100vw; height: 100vh; height: 100svh; }
    .solution-center-hero-video { object-fit: cover; }
    .solution-center-hero-copy { top: 50%; left: max(40px, 8%); width: min(440px, 60%); transform: translateY(-50%); }
    .solution-center-brand-mark { width: 130px; right: 6%; opacity: .4; }
    /* 移动端横屏：复用 PC 鼠标样式滚动提示，并适配小屏与刘海安全区 */
    .solution-center-scroll-hint {
        display: flex;
        bottom: calc(18px + env(safe-area-inset-bottom, 0px));
        gap: 8px;
    }
    .solution-center-scroll-hint .scroll-mouse {
        width: 20px;
        height: 32px;
        border-width: 2px;
    }
    .solution-center-scroll-hint .scroll-wheel {
        top: 6px;
        width: 3px;
        height: 6px;
        margin-left: -1.5px;
    }
    .solution-center-scroll-hint .scroll-text {
        font-size: 11px;
        letter-spacing: .18em;
    }
}

.solution-center-content { width: min(1200px, 100%); min-height: 530px; margin: 0 auto; padding: 0 40px 100px; }
.solution-center-tabs { display: flex; align-items: center; justify-content: center; gap: clamp(34px, 6vw, 92px); min-height: 88px; }
.solution-center-tab { position: relative; display: inline-flex; align-items: center; gap: 9px; padding: 28px 0; color: #a3aca5; border: 0; background: transparent; cursor: pointer; font: inherit; font-size: 16px; line-height: 1.4; transition: color .2s ease; }
.solution-center-tab::before { width: 10px; height: 10px; border: 2px solid #d8ded9; border-radius: 50%; content: ""; transition: border-color .2s ease, background .2s ease; }
.solution-center-tab:hover,
.solution-center-tab.is-active { color: #4e7259; }
.solution-center-tab.is-active::before { border-color: #4d8d63; background: #4d8d63; box-shadow: 0 0 0 3px rgba(77, 141, 99, .12); }
.solution-center-intro { padding: 61px 0 30px; text-align: center; }
.solution-center-intro p { margin: 0 0 15px; color: #6e9877; font-size: 12px; font-weight: 600; letter-spacing: .13em; }
.solution-center-intro h2 { margin: 0; color: #233a2b; font-size: clamp(29px, 3vw, 40px); font-weight: 500; line-height: 1.35; letter-spacing: -.035em; }
.solution-center-intro span { display: block; max-width: 610px; margin: 14px auto 0; color: #6a796f; font-size: 14px; line-height: 1.85; }
.solution-product-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; padding-top: 42px; }
.solution-product-card { position: relative; display: block; min-height: 0; overflow: hidden; background: #dfe5df; color: #fff; }
.solution-product-card::before { position: absolute; z-index: 1; inset: 0; background: rgba(33, 107, 157, .74); content: ""; opacity: 0; transition: opacity .28s ease; }
.solution-product-card::after { position: absolute; z-index: 2; inset: 34% 0 0; background: linear-gradient(180deg, transparent, rgba(13, 30, 20, .78)); content: ""; transition: opacity .28s ease; }
.solution-product-card img { display: block; width: 100%; aspect-ratio: 16 / 10; object-fit: cover; transition: transform .45s cubic-bezier(.2, .7, .2, 1); }
.solution-product-hover { position: absolute; z-index: 3; top: 50%; left: 50%; display: grid; place-items: center; gap: 9px; color: #fff; font-size: 14px; line-height: 1.4; opacity: 0; transform: translate(-50%, calc(-50% + 10px)); transition: opacity .28s ease, transform .28s ease; }
.solution-product-hover svg { width: 31px; height: 31px; fill: none; stroke: currentColor; stroke-width: 1.55; }
.solution-product-card > div { position: absolute; z-index: 3; right: 22px; bottom: 19px; left: 22px; }
.solution-product-card strong { display: block; color: #fff; font-size: 19px; font-weight: 500; line-height: 1.35; }
.solution-product-card span { display: block; max-height: 0; overflow: hidden; margin-top: 0; color: rgba(255, 255, 255, .82); font-size: 12px; line-height: 1.65; opacity: 0; transition: max-height .3s ease, margin .3s ease, opacity .25s ease; }
.solution-product-card .solution-product-hover { display: grid; width: 92px; max-height: none; margin: 0; overflow: visible; place-items: center; gap: 9px; color: #fff; font-size: 14px; line-height: 1.4; text-align: center; opacity: 0; }
.solution-product-hover b { display: block; font-weight: 400; white-space: nowrap; }
.solution-product-card:hover::before { opacity: 1; }
.solution-product-card:hover::after { opacity: .35; }
.solution-product-card:hover img { transform: scale(1.04); }
.solution-product-card:hover .solution-product-hover { margin: 0; opacity: 1; transform: translate(-50%, -50%); }
.solution-product-card:hover span { max-height: 60px; margin-top: 7px; opacity: 1; }
.solution-product-detail { max-width: 980px; margin: 0 auto; padding: 54px 0 34px; }
.solution-product-detail-heading { margin-bottom: 28px; text-align: center; }
.solution-product-detail-heading span { display: block; margin-bottom: 13px; color: #6e9877; font-size: 12px; font-weight: 600; letter-spacing: .13em; }
.solution-product-detail-heading h2 { margin: 0; color: #233a2b; font-size: clamp(31px, 3.2vw, 44px); font-weight: 500; line-height: 1.3; letter-spacing: -.04em; }
.solution-product-detail > figure { margin: 0; overflow: hidden; background: #e3e8e3; }
.solution-product-detail > figure img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.solution-product-detail > figure img.product-image-contain { object-fit: contain; }
.solution-product-copy,
.solution-product-specs { max-width: 800px; margin: 0 auto; }
.solution-product-copy { padding-top: 34px; }
.solution-product-specs { padding-top: 32px; }
.solution-product-copy h3,
.solution-product-specs h3 { margin: 0 0 15px; color: #294535; font-size: 16px; font-weight: 600; letter-spacing: .04em; }
.solution-product-copy ol { margin: 0; padding-left: 23px; color: #506459; font-size: 15px; line-height: 2; }
.solution-product-copy li { padding-left: 3px; }
.solution-product-copy li + li { margin-top: 7px; }
.solution-product-specs-table { overflow-x: auto; border-top: 1px solid #78907f; border-left: 1px solid #78907f; background: #fff; }
.solution-product-specs table { width: 100%; min-width: 560px; border-collapse: collapse; table-layout: fixed; }
.solution-product-specs th,
.solution-product-specs td { padding: 13px 18px; border-right: 1px solid #78907f; border-bottom: 1px solid #78907f; color: #374d3e; font-size: 14px; line-height: 1.55; text-align: center; vertical-align: middle; }
.solution-product-specs th { width: 34%; background: #f4f8f4; font-weight: 600; }
.solution-product-specs td { background: #fff; font-weight: 400; }
.solution-detail-switch { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 20px; margin-top: 46px; padding-top: 22px; border-top: 1px solid rgba(48, 70, 58, .14); }
.solution-detail-switch a { color: #6a796f; font-size: 13px; transition: color .2s ease; }
.solution-detail-switch a:hover { color: #28573a; }
.solution-detail-switch a:last-child { text-align: right; }
.solution-detail-switch .solution-detail-return { padding: 8px 16px; border: 1px solid rgba(48, 70, 58, .22); color: #3e6048; }
.solution-detail-switch .solution-detail-return:hover { border-color: #5b9270; background: #edf4ed; }
.solution-detail-switch span { min-height: 1px; }
@media (max-width: 900px) {
    .solution-center-content { padding-right: 28px; padding-left: 28px; }
    .solution-product-detail { padding-right: 0; padding-left: 0; }
}
@media (max-width: 760px) {
    .solution-center-hero { --hero-height: max(100svh, 540px); height: var(--hero-height); margin-top: 0; }
    .solution-center-brand-mark { top: 56%; right: -54px; width: 176px; opacity: .4; }
    .solution-center-hero-copy { right: 20px; left: 20px; width: auto; }
    .solution-center-wordmark { width: 150px; margin-bottom: 22px; }
    .solution-center-hero p { font-size: 14px; }
    .solution-center-content { padding: 0 20px 64px; }
    .solution-center-tabs { justify-content: flex-start; gap: 28px; min-height: 64px; overflow-x: auto; }
    .solution-center-tab { flex: 0 0 auto; padding: 21px 0; font-size: 15px; }
    .solution-center-intro { padding: 44px 0 22px; text-align: left; }
    .solution-center-intro h2 { font-size: 28px; }
    .solution-center-intro span { margin-right: 0; margin-left: 0; }
    .solution-product-grid { grid-template-columns: 1fr; gap: 14px; padding-top: 26px; }
    .solution-product-card > div { right: 18px; bottom: 16px; left: 18px; }
    .solution-product-card > div span { display: none; }
    .solution-product-hover { display: none; }
    .solution-product-detail { padding: 35px 0 18px; }
    .solution-product-detail-heading { margin-bottom: 20px; text-align: left; }
    .solution-product-detail-heading h2 { font-size: 29px; }
    .solution-product-copy { padding-top: 24px; }
    .solution-product-copy ol { padding-left: 21px; font-size: 14px; line-height: 1.9; }
    .solution-product-specs { padding-top: 26px; }
    .solution-product-specs th,
    .solution-product-specs td { padding: 11px 14px; font-size: 13px; }
    .solution-detail-switch { gap: 12px; margin-top: 32px; }
}

/* ============ 移动端 header 适配（防止溢出/横向滚动） ============ */
@media (max-width: 1024px) {
    .header-inner {
        min-width: 0;
        width: 100%;
    }
    .header-inner > .logo {
        flex: 1 1 auto !important;        /* 占据剩余空间，让 logo 不撑破 header-inner */
        min-width: 0 !important;
        max-width: calc(100% - 60px);    /* 窄屏语言按钮已隐藏，仅给汉堡菜单留空间 */
    }
    .brand-logo {
        width: 100% !important;
        max-width: 100%;
        height: auto;
        display: block;
    }
    .menu-toggle { flex-shrink: 0; }
}

@media (max-width: 360px) {
    .header-inner > .logo {
        max-width: calc(100% - 50px);
    }
}

@media (max-width: 768px) {
    .brand-logo {
        width: 210px !important;
    }
}

/* 移动端横屏：进一步缩小 logo，避免侵占首屏视频区域；加 max-width 限制，避免桌面短窗口被误判 */
@media (orientation: landscape) and (max-height: 500px) and (max-width: 1024px) {
    .header { padding: 0 14px; height: 64px; min-height: 64px; }
    .header-inner { min-height: 64px; }
    .header-inner > .logo {
        flex: 0 0 auto !important;
        min-width: 0 !important;
        max-width: calc(100% - 100px);
    }
    .brand-logo { width: 175px !important; height: auto; }
    .solution-center-hero { margin-top: 0; }
}

/* ============ 全站首屏加载层（复用 loading.html，与首页 hero-loader 一致） ============ */
.page-loader {
    position: fixed;
    inset: 0;
    z-index: 3000;
    background: #ffffff;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.5s ease, visibility 0s linear 0s;
}
.page-loader.is-hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.5s ease, visibility 0s linear 0.5s;
}
.page-loader iframe {
    width: 100%;
    height: 100%;
    border: 0;
    display: block;
}
@media (prefers-reduced-motion: reduce) {
    .page-loader { transition: opacity 0.2s ease; }
    .page-loader.is-hidden { transition: opacity 0.2s ease, visibility 0s linear 0.2s; }
}