/* 全站字体层级：标题清晰、正文舒展、移动端保持可读性 */
html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    font-size: 16px;
    line-height: 1.75;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    text-wrap: balance;
}

p {
    text-wrap: pretty;
}

.nav-menu > li > a {
    font-size: 15px;
    line-height: 1.4;
}

.nav-menu .dropdown a,
.lang-switch,
.lang-dropdown a {
    font-size: 14px;
}

.section-title {
    font-size: clamp(36px, 3.4vw, 44px);
    line-height: 1.22;
    letter-spacing: -0.02em;
}

.section-desc {
    max-width: 760px;
    font-size: 17px;
    line-height: 1.85;
}

.solution-card h3,
.about-card h3 {
    font-size: 20px;
    line-height: 1.4;
}

.solution-card p,
.about-card p {
    font-size: 15px;
    line-height: 1.8;
}

.responsibility-banner-label {
    font-size: 14px;
    line-height: 1.4;
    letter-spacing: 0.12em;
}

.responsibility-banner h1 {
    font-size: clamp(46px, 5.4vw, 68px);
    line-height: 1.16;
    letter-spacing: -0.025em;
}

.responsibility-banner p {
    max-width: 500px;
    font-size: 18px;
    line-height: 1.85;
}

.impact-intro h3 {
    font-size: clamp(28px, 3vw, 36px);
    line-height: 1.35;
}

.impact-intro-copy p,
.impact-principle span,
.impact-card p,
.impact-card li,
.impact-pathway > p,
.impact-pathway-item p {
    font-size: 15px;
    line-height: 1.85;
}

.impact-principle strong,
.impact-card h3,
.impact-pathway h3,
.impact-pathway-item h4 {
    line-height: 1.45;
}

.impact-card h3 {
    font-size: 21px;
}

.news-title {
    font-size: 18px;
    line-height: 1.55;
}

.news-desc {
    font-size: 14px;
    line-height: 1.8;
}

.service-name {
    font-size: 16px;
    line-height: 1.5;
}

.service-phone {
    font-size: 16px !important;
    line-height: 1.65;
}

.service-email,
.form-group label,
.form-group input,
.form-group textarea,
.form-group select {
    font-size: 15px;
    line-height: 1.6;
}

.contact-form h3 {
    font-size: 24px !important;
    line-height: 1.4;
}

.contact-form .section-desc {
    font-size: 15px !important;
}

/* 独立子页面 */
.hero h1 {
    font-size: clamp(44px, 5.2vw, 64px);
    line-height: 1.12;
    letter-spacing: -0.025em;
}

.hero p {
    font-size: 18px;
    line-height: 1.8;
}

.intro h2 {
    font-size: clamp(32px, 3.7vw, 42px);
    line-height: 1.3;
    letter-spacing: -0.018em;
}

.intro p {
    font-size: 17px;
    line-height: 2;
}

.section-heading h2 {
    font-size: clamp(32px, 3.5vw, 40px);
    line-height: 1.28;
    letter-spacing: -0.018em;
}

.section-heading p {
    font-size: 16px;
    line-height: 1.85;
}

.highlight-card h3 {
    font-size: 24px;
    line-height: 1.4;
}

.capability-card h3,
.feature-card strong,
.about-detail-card h3,
.flow-step h3 {
    font-size: 20px;
    line-height: 1.45;
}

.capability-card p,
.feature-card p,
.about-detail-card p,
.flow-step p {
    font-size: 15px;
    line-height: 1.85;
}

.about-detail-heading h2 {
    font-size: clamp(32px, 3.8vw, 44px);
    line-height: 1.3;
    letter-spacing: -0.02em;
}

.about-detail-heading > p {
    font-size: 16px;
    line-height: 1.9;
}

.about-closing-panel h2 {
    font-size: clamp(28px, 3.4vw, 38px);
    line-height: 1.35;
}

.about-closing-panel p {
    font-size: 16px;
    line-height: 1.85;
}

.footer-brand p,
.footer-col li a {
    font-size: 14px;
    line-height: 1.8;
}

.footer-col h4 {
    font-size: 16px;
    line-height: 1.4;
}

.footer-bottom {
    font-size: 13px;
    line-height: 1.7;
}

@media (max-width: 768px) {
    body {
        font-size: 15px;
        line-height: 1.75;
    }

    .section-title {
        font-size: 30px;
        line-height: 1.28;
        letter-spacing: -0.015em;
    }

    .section-desc {
        font-size: 16px;
        line-height: 1.8;
    }

    .solution-card h3,
    .about-card h3,
    .impact-card h3 {
        font-size: 19px;
    }

    .solution-card p,
    .about-card p,
    .impact-intro-copy p,
    .impact-card p,
    .impact-card li,
    .impact-pathway > p,
    .impact-pathway-item p {
        font-size: 15px;
        line-height: 1.8;
    }

    .responsibility-banner-label {
        font-size: 13px;
    }

    .responsibility-banner h1 {
        font-size: 38px;
        line-height: 1.2;
    }

    .responsibility-banner p {
        font-size: 16px;
        line-height: 1.8;
    }

    .impact-intro h3 {
        font-size: 27px;
    }

    .news-title {
        font-size: 17px;
    }

    .hero h1 {
        font-size: 38px;
        line-height: 1.18;
    }

    .hero p {
        font-size: 16px;
        line-height: 1.75;
    }

    .intro h2,
    .section-heading h2,
    .about-detail-heading h2 {
        font-size: 30px;
        line-height: 1.35;
    }

    .intro p,
    .section-heading p,
    .about-detail-heading > p,
    .about-closing-panel p {
        font-size: 15px;
        line-height: 1.85;
    }

    .capability-card h3,
    .feature-card strong,
    .about-detail-card h3,
    .flow-step h3 {
        font-size: 19px;
    }

    .capability-card p,
    .feature-card p,
    .about-detail-card p,
    .flow-step p {
        font-size: 15px;
        line-height: 1.8;
    }

    .footer-brand p,
    .footer-col li a {
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 28px;
    }

    .responsibility-banner h1,
    .hero h1 {
        font-size: 34px;
    }

    .intro h2,
    .section-heading h2,
    .about-detail-heading h2 {
        font-size: 28px;
    }
}