/* ===========================================================
   心启航医疗 — 全新设计风格
   风格定位：深蓝+极简、大面积留白、大字排版、线性图标
   =========================================================== */

/* ---------- 设计令牌 ---------- */
:root {
    /* 色彩 */
    --blue-900: #0c1b3a;
    --blue-800: #11294d;
    --blue-700: #183d6e;
    --blue-600: #1e4f8f;
    --blue-500: #2563eb;
    --blue-400: #5b8af5;
    --blue-300: #93b4fd;
    --blue-100: #dbe5fe;
    --blue-50: #eef3ff;

    --sky: #38bdf8;
    --ink: #0f172a;
    --text: #334155;
    --text-light: #64748b;
    --muted: #94a3b8;
    --line: #e2e8f0;
    --surface: #f8fafc;
    --white: #ffffff;

    /* 字体 */
    --font: -apple-system, BlinkMacSystemFont, 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;

    /* 间距 */
    --s1: 8px; --s2: 16px; --s3: 24px; --s4: 32px;
    --s5: 48px; --s6: 72px; --s7: 96px; --s8: 128px;

    /* 圆角 */
    --r-sm: 8px; --r: 12px; --r-lg: 20px; --r-xl: 28px;

    /* 阴影 */
    --sh: 0 1px 3px rgba(15,23,42,.06), 0 1px 2px rgba(15,23,42,.04);
    --sh-md: 0 4px 16px rgba(15,23,42,.07);
    --sh-lg: 0 12px 40px rgba(15,23,42,.1);
    --sh-xl: 0 20px 60px rgba(15,23,42,.12);

    /* 头部高度 */
    --topbar-h: 40px;
    --header-h: 68px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; }
body { font-family: var(--font); color: var(--text); background: var(--white); line-height: 1.7; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea { font-family: inherit; font-size: inherit; }

.container { max-width: 1160px; margin: 0 auto; padding: 0 var(--s3); }

/* ---------- 标签/标题通用 ---------- */
.tag {
    display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 3px;
    text-transform: uppercase; color: var(--blue-500); margin-bottom: var(--s2);
}
.heading-2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 800; color: var(--ink);
    letter-spacing: -0.03em; line-height: 1.2;
}
.sec-head { text-align: center; margin-bottom: var(--s6); }
.sec-desc { font-size: 1.05rem; color: var(--text-light); max-width: 480px; margin: var(--s2) auto 0; }

/* ---------- 揭示动画 ---------- */
.reveal {
    opacity: 0; transform: translateY(32px);
    transition: opacity .7s cubic-bezier(.22,1,.36,1), transform .7s cubic-bezier(.22,1,.36,1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }


/* ========== 顶部信息条 ========== */
.top-bar {
    height: var(--topbar-h); background: var(--blue-900); color: rgba(255,255,255,.7);
    font-size: 12px; letter-spacing: .02em; overflow: hidden;
}
.top-bar-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.top-bar-left { display: flex; gap: var(--s3); }
.top-bar-right { display: flex; align-items: center; }
.cert-badge {
    background: rgba(56,189,248,.15); color: var(--sky); padding: 3px 14px;
    border-radius: 100px; font-weight: 600; font-size: 11px; letter-spacing: .5px;
}


/* ========== 导航 ========== */
.header {
    position: sticky; top: 0; z-index: 100; height: var(--header-h);
    background: rgba(255,255,255,.85); backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--line); transition: box-shadow .3s;
}
.header.scrolled { box-shadow: var(--sh-md); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }

/* 品牌LOGO */
.brand { display: flex; align-items: center; gap: 10px; }
.brand-logo { height: 70px; width: auto; object-fit: contain; }
.brand-mark {
    width: 38px; height: 38px; background: var(--blue-500); color: #fff;
    border-radius: var(--r-sm); display: grid; place-items: center;
    font-weight: 900; font-size: 18px; letter-spacing: 0; flex-shrink: 0;
}
.brand-info strong { display: block; font-size: 15px; color: var(--ink); line-height: 1.3; }
.brand-info small { font-size: 10px; color: var(--muted); letter-spacing: 1.5px; }

/* 导航链接 */
.nav { display: flex; gap: var(--s3); }
.nav-link {
    font-size: 14px; font-weight: 500; color: var(--text-light); padding: 4px 0;
    position: relative; transition: color .2s;
}
.nav-link::after {
    content: ''; position: absolute; bottom: -2px; left: 0; right: 0; height: 2px;
    background: var(--blue-500); border-radius: 2px; transform: scaleX(0);
    transform-origin: right; transition: transform .35s cubic-bezier(.22,1,.36,1);
}
.nav-link:hover, .nav-link.active { color: var(--blue-500); }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); transform-origin: left; }

/* 汉堡按钮 */
.menu-btn { display: none; width: 28px; height: 20px; position: relative; z-index: 101; }
.menu-btn span {
    display: block; width: 100%; height: 2px; background: var(--ink);
    border-radius: 2px; position: absolute; left: 0; transition: all .3s;
}
.menu-btn span:nth-child(1) { top: 0; }
.menu-btn span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.menu-btn span:nth-child(3) { bottom: 0; width: 70%; }
.menu-btn.open span:nth-child(1) { top: 50%; transform: translateY(-50%) rotate(45deg); }
.menu-btn.open span:nth-child(2) { opacity: 0; }
.menu-btn.open span:nth-child(3) { bottom: 50%; width: 100%; transform: translateY(50%) rotate(-45deg); }


/* ========== Hero ========== */
.hero {
    position: relative; min-height: 92vh; display: flex; align-items: center;
    background: var(--blue-900); overflow: hidden; padding: var(--s8) 0 var(--s7);
}
.hero-visual { position: absolute; inset: 0; pointer-events: none; }
.hero-orb {
    position: absolute; border-radius: 50%; filter: blur(80px); opacity: .35;
}
.hero-orb-1 { width: 600px; height: 600px; background: var(--blue-500); top: -20%; right: -10%; }
.hero-orb-2 { width: 400px; height: 400px; background: var(--sky); bottom: -10%; left: -5%; }
.hero-orb-3 { width: 300px; height: 300px; background: #6366f1; top: 40%; left: 40%; }
.hero-grid-bg {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-inner { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; gap: var(--s6); }
.hero-content { max-width: 600px; }
.hero-eyebrow {
    display: inline-flex; align-items: center; gap: var(--s2);
    font-size: 13px; font-weight: 500; color: rgba(255,255,255,.65);
    margin-bottom: var(--s3); letter-spacing: .02em;
}
.dot-pulse {
    width: 8px; height: 8px; background: var(--sky); border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; transform: scale(1); } 50% { opacity: .4; transform: scale(1.5); } }

.hero-heading {
    font-size: clamp(2.5rem, 5.5vw, 3.8rem); font-weight: 900; color: #fff;
    letter-spacing: -0.04em; line-height: 1.15; margin-bottom: var(--s3);
}
.highlight { color: var(--sky); }

.hero-subtext {
    font-size: 1.05rem; color: rgba(255,255,255,.55); line-height: 1.85;
    margin-bottom: var(--s4); max-width: 520px;
}
.hero-actions { display: flex; gap: var(--s2); flex-wrap: wrap; }

/* CTA按钮 */
.cta-primary {
    display: inline-flex; align-items: center; gap: var(--s1);
    padding: 14px 32px; background: var(--blue-500); color: #fff;
    border-radius: var(--r); font-weight: 600; font-size: .95rem;
    transition: all .25s; box-shadow: 0 4px 20px rgba(37,99,235,.4);
}
.cta-primary:hover { background: var(--blue-400); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(37,99,235,.45); }
.cta-ghost {
    display: inline-flex; align-items: center; gap: var(--s1);
    padding: 14px 32px; color: rgba(255,255,255,.7);
    border: 1.5px solid rgba(255,255,255,.2); border-radius: var(--r);
    font-weight: 500; font-size: .95rem; transition: all .25s;
}
.cta-ghost:hover { border-color: rgba(255,255,255,.5); color: #fff; background: rgba(255,255,255,.06); }

/* 数据卡片 */
.hero-data { display: flex; gap: var(--s2); flex-shrink: 0; }
.data-card {
    background: rgba(255,255,255,.06); border: 1px solid rgba(255,255,255,.1);
    backdrop-filter: blur(12px); border-radius: var(--r-lg); padding: var(--s3) var(--s3);
    text-align: center; min-width: 130px; transition: all .3s;
}
.data-card:hover { background: rgba(255,255,255,.1); transform: translateY(-4px); }
.data-val {
    font-size: 2.2rem; font-weight: 900; color: #fff; letter-spacing: -0.03em;
    display: inline; font-family: -apple-system, BlinkMacSystemFont, 'PingFang SC', sans-serif;
}
.data-plus { font-size: 1.3rem; font-weight: 700; color: var(--sky); display: inline; }
.data-label { display: block; font-size: 12px; color: rgba(255,255,255,.45); margin-top: var(--s1); }


/* ========== 品牌滚动条 ========== */
.brand-strip {
    border-bottom: 1px solid var(--line); padding: var(--s4) 0; overflow: hidden;
    background: var(--white);
}
.strip-label {
    text-align: center; font-size: 12px; font-weight: 600; color: var(--muted);
    letter-spacing: 2px; text-transform: uppercase; margin-bottom: var(--s3);
}
.strip-scroll { overflow: hidden; position: relative; }
.strip-scroll::before, .strip-scroll::after {
    content: ''; position: absolute; top: 0; bottom: 0; width: 80px; z-index: 2;
}
.strip-scroll::before { left: 0; background: linear-gradient(to right, #fff, transparent); }
.strip-scroll::after { right: 0; background: linear-gradient(to left, #fff, transparent); }
.strip-track {
    display: flex; align-items: center; gap: var(--s3);
    animation: marquee 30s linear infinite; width: max-content;
}
@keyframes marquee { 0% { transform: translateX(0); } 100% { transform: translateX(-50%); } }
.strip-item { font-size: 14px; font-weight: 600; color: var(--text-light); white-space: nowrap; }
.strip-divider { color: var(--line); font-weight: 300; }


/* ========== 关于我们 ========== */
.about { padding: var(--s8) 0; }
.about-layout { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s7); align-items: center; }

.about-card-main { border-radius: var(--r-lg); overflow: hidden; }
.about-img-box {
    aspect-ratio: 4/3; overflow: hidden; border-radius: var(--r-lg);
}
.about-img-box img { width: 100%; height: 100%; object-fit: cover; display: block; }
.about-float-card {
    display: flex; align-items: center; gap: var(--s2);
    background: var(--white); border-radius: var(--r); padding: var(--s2) var(--s3);
    box-shadow: var(--sh-lg); margin-top: calc(-1 * var(--s4)); margin-left: var(--s4);
    position: relative; z-index: 2;
}
.float-icon { font-size: 28px; }
.float-num { font-size: 1.6rem; font-weight: 900; color: var(--blue-500); line-height: 1; }
.float-txt { font-size: 12px; color: var(--text-light); }

.about-text .heading-2 { margin-bottom: var(--s3); }
.about-para { color: var(--text); margin-bottom: var(--s2); line-height: 1.85; }
.about-para strong { color: var(--blue-500); }
.about-credentials { display: flex; flex-direction: column; gap: var(--s1); margin-top: var(--s4); }
.cred-item { display: flex; align-items: center; gap: var(--s2); font-size: .95rem; font-weight: 500; color: var(--text); }
.cred-icon {
    width: 26px; height: 26px; display: grid; place-items: center;
    background: rgba(37,99,235,.08); color: var(--blue-500);
    border-radius: 50%; font-size: 13px; font-weight: 700;
}


/* ========== 产品中心 ========== */
.products { padding: var(--s8) 0; background: var(--surface); }
.prod-filter { display: flex; justify-content: center; gap: var(--s1); margin-bottom: var(--s5); flex-wrap: wrap; }
.filter-btn {
    padding: 10px 22px; font-size: 13px; font-weight: 600; color: var(--text-light);
    border-radius: 100px; transition: all .25s; border: 1.5px solid transparent;
}
.filter-btn:hover { color: var(--blue-500); background: var(--blue-50); }
.filter-btn.active { color: #fff; background: var(--blue-500); box-shadow: 0 4px 14px rgba(37,99,235,.3); }

.prod-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s3); }
.prod-card {
    background: var(--white); border-radius: var(--r); overflow: hidden;
    border: 1px solid var(--line); transition: all .35s cubic-bezier(.22,1,.36,1);
}
.prod-card:hover { transform: translateY(-6px); box-shadow: var(--sh-lg); border-color: transparent; }
.prod-card.hide { display: none; }

.prod-thumb {
    aspect-ratio: 4/3; background: linear-gradient(160deg, var(--blue-50), var(--surface));
    display: grid; place-items: center; color: var(--blue-300); padding: var(--s3);
    position: relative; overflow: hidden; transition: all .35s;
}
.prod-card:hover .prod-thumb { background: linear-gradient(160deg, var(--blue-100), var(--blue-50)); color: var(--blue-500); }
.prod-thumb svg { width: 80px; transition: transform .4s; }
.prod-card:hover .prod-thumb svg { transform: scale(1.08); }
.prod-cat {
    position: absolute; top: 12px; left: 12px; font-size: 11px; font-weight: 700;
    color: var(--blue-500); background: rgba(255,255,255,.85); backdrop-filter: blur(6px);
    padding: 4px 12px; border-radius: 100px;
}
.prod-body { padding: var(--s2) var(--s3) var(--s3); }
.prod-body h3 { font-size: 1.05rem; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.prod-body p { font-size: .875rem; color: var(--text-light); line-height: 1.7; }


/* ========== 核心优势 ========== */
.strengths { padding: var(--s8) 0; }
.str-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s2); }
.str-card {
    padding: var(--s4) var(--s3); border-radius: var(--r-lg); position: relative;
    border: 1px solid var(--line); transition: all .4s cubic-bezier(.22,1,.36,1);
    overflow: hidden;
}
.str-card::before {
    content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, var(--blue-500), var(--blue-700));
    opacity: 0; transition: opacity .4s; border-radius: var(--r-lg);
}
.str-card:hover { border-color: transparent; transform: translateY(-6px); box-shadow: var(--sh-xl); }
.str-card:hover::before { opacity: 1; }
.str-num {
    font-size: 3rem; font-weight: 900; color: var(--line); letter-spacing: -0.04em;
    line-height: 1; margin-bottom: var(--s3); transition: color .4s; position: relative; z-index: 1;
}
.str-card:hover .str-num { color: rgba(255,255,255,.2); }
.str-card h3 {
    font-size: 1.1rem; font-weight: 700; color: var(--ink); margin-bottom: var(--s1);
    position: relative; z-index: 1; transition: color .4s;
}
.str-card:hover h3 { color: #fff; }
.str-card p {
    font-size: .875rem; color: var(--text-light); line-height: 1.8;
    position: relative; z-index: 1; transition: color .4s;
}
.str-card:hover p { color: rgba(255,255,255,.75); }


/* ========== 新闻资讯 ========== */
.news { padding: var(--s8) 0; background: var(--surface); }
.news-list { display: flex; flex-direction: column; gap: 2px; max-width: 800px; margin: 0 auto; }
.news-row {
    display: flex; align-items: center; gap: var(--s3); padding: var(--s3) var(--s3);
    background: var(--white); border-radius: var(--r); transition: all .25s;
}
.news-row:hover { background: var(--blue-50); transform: translateX(4px); }
.news-date-block {
    text-align: center; min-width: 60px; padding: var(--s1); flex-shrink: 0;
}
.news-day { display: block; font-size: 1.6rem; font-weight: 900; color: var(--blue-500); line-height: 1; }
.news-month { font-size: 12px; color: var(--muted); }
.news-body { flex: 1; min-width: 0; }
.news-body h3 { font-size: .95rem; font-weight: 700; color: var(--ink); margin-bottom: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.news-body p { font-size: .8rem; color: var(--text-light); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.news-type {
    font-size: 11px; font-weight: 600; padding: 4px 14px; border-radius: 100px;
    background: var(--blue-50); color: var(--blue-500); flex-shrink: 0;
}
.news-type.alt { background: rgba(16,185,129,.08); color: #10b981; }


/* ========== 联系我们 ========== */
.contact { padding: var(--s8) 0; }
.contact-cards {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s2);
    max-width: 900px; margin: 0 auto;
}

.c-card {
    display: flex; align-items: flex-start; gap: var(--s2); padding: var(--s2);
    border-radius: var(--r); border: 1px solid var(--line); transition: all .25s;
}
.c-card:hover { border-color: var(--blue-200); box-shadow: var(--sh); }
.c-card-icon {
    width: 44px; height: 44px; display: grid; place-items: center;
    background: var(--blue-50); color: var(--blue-500); border-radius: var(--r-sm); flex-shrink: 0;
}
.c-card-label { font-size: 12px; color: var(--muted); }
.c-card-val { font-size: .9rem; font-weight: 600; color: var(--ink); }

/* 表单 */
.contact-form {
    background: var(--white); border: 1px solid var(--line); border-radius: var(--r-lg);
    padding: var(--s4); box-shadow: var(--sh);
}
.contact-form h3 { font-size: 1.2rem; font-weight: 700; color: var(--ink); margin-bottom: var(--s3); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s2); margin-bottom: var(--s3); }
.form-grid .full { grid-column: span 2; }
.field input, .field textarea {
    width: 100%; padding: 12px 16px; border: 1.5px solid var(--line); border-radius: var(--r-sm);
    color: var(--ink); background: var(--surface); outline: none; transition: all .2s;
}
.field input:focus, .field textarea:focus { border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(37,99,235,.1); background: #fff; }
.field input::placeholder, .field textarea::placeholder { color: var(--muted); }
.field textarea { resize: vertical; min-height: 90px; }
.submit-btn { width: 100%; justify-content: center; }


/* ========== 页脚 ========== */
.footer { background: var(--blue-900); color: rgba(255,255,255,.55); padding: var(--s7) 0 0; }
.footer-main { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: var(--s5); padding-bottom: var(--s5); }
.footer-brand p { font-size: .875rem; line-height: 1.8; margin-top: var(--s2); max-width: 300px; }
.footer .brand-mark { background: rgba(56,189,248,.15); color: var(--sky); }
.footer .brand-info strong { color: #fff; }
.footer .brand-info small { color: rgba(255,255,255,.35); }
.footer-col h4 { font-size: 14px; font-weight: 700; color: #fff; margin-bottom: var(--s2); }
.footer-col a {
    display: block; font-size: .875rem; color: rgba(255,255,255,.5);
    padding: 3px 0; transition: all .2s;
}
.footer-col a:hover { color: var(--sky); transform: translateX(4px); }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,.06); padding: var(--s2) 0;
    text-align: center; font-size: 12px; color: rgba(255,255,255,.3);
}


/* ========== 回到顶部 ========== */
.to-top {
    position: fixed; bottom: 28px; right: 28px; width: 44px; height: 44px;
    display: grid; place-items: center; background: var(--blue-500); color: #fff;
    border-radius: 50%; box-shadow: 0 4px 16px rgba(37,99,235,.35);
    opacity: 0; visibility: hidden; transform: translateY(12px);
    transition: all .3s; z-index: 99;
}
.to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.to-top:hover { background: var(--blue-400); transform: translateY(-3px); }


/* ========== Toast ========== */
.toast {
    position: fixed; top: 90px; left: 50%; transform: translateX(-50%) translateY(-16px);
    display: flex; align-items: center; gap: var(--s1);
    padding: 14px 28px; background: #fff; border-radius: var(--r);
    box-shadow: var(--sh-xl); font-size: 14px; font-weight: 500;
    z-index: 9999; opacity: 0; transition: all .35s;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.ok { color: #10b981; border-left: 4px solid #10b981; }
.toast.err { color: #ef4444; border-left: 4px solid #ef4444; }


/* ============================================================
   响应式
   ============================================================ */

/* ≤1024px */
@media (max-width: 1023px) {
    .top-bar { display: none; }
    :root { --header-h: 60px; }

    .menu-btn { display: block; }
    .nav {
        position: fixed; inset: 0; background: rgba(255,255,255,.97); backdrop-filter: blur(16px);
        flex-direction: column; align-items: center; justify-content: center; gap: var(--s4);
        opacity: 0; visibility: hidden; transition: all .3s; z-index: 100;
    }
    .nav.open { opacity: 1; visibility: visible; }
    .nav-link { font-size: 1.2rem; }

    .hero { min-height: 80vh; padding: var(--s6) 0; }
    .hero-inner { flex-direction: column; text-align: center; }
    .hero-content { max-width: 100%; }
    .hero-subtext { margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; }

    .about-layout { grid-template-columns: 1fr; gap: var(--s5); }
    .about-media { order: -1; }
    .about-float-card { margin-left: var(--s2); }

    .prod-grid { grid-template-columns: repeat(2, 1fr); }

    .str-grid { grid-template-columns: repeat(2, 1fr); }

    .news-row { flex-wrap: wrap; }
    .news-type { margin-left: auto; }

    .contact-layout { grid-template-columns: 1fr; }
    .contact-cards { grid-template-columns: 1fr 1fr; }

    .footer-main { grid-template-columns: 1fr 1fr; gap: var(--s4); }
    .footer-brand { grid-column: span 2; }
}

/* ≤768px */
@media (max-width: 767px) {
    .container { padding: 0 var(--s2); }
    .about, .products, .strengths, .news, .contact { padding: var(--s6) 0; }
    .sec-head { margin-bottom: var(--s4); }

    .hero { min-height: 100vh; }
    .hero-heading { font-size: 2rem; }
    .hero-data { flex-direction: column; width: 100%; }
    .data-card { min-width: auto; }
    .hero-actions { flex-direction: column; }
    .cta-primary, .cta-ghost { width: 100%; justify-content: center; }

    .prod-grid { grid-template-columns: 1fr; }

    .str-grid { grid-template-columns: 1fr; }

    .news-row { flex-direction: column; align-items: flex-start; gap: var(--s1); }
    .news-type { margin-left: 0; }

    .contact-cards { grid-template-columns: 1fr; }
    .form-grid { grid-template-columns: 1fr; }
    .form-grid .full { grid-column: auto; }

    .footer-main { grid-template-columns: 1fr; }
    .footer-brand { grid-column: auto; }
}

/* ≤480px */
@media (max-width: 479px) {
    .hero-heading { font-size: 1.75rem; }
    .brand-strip { display: none; }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; }
}