* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Microsoft YaHei", "PingFang SC", sans-serif;
    background-color: #0a0e17;
    color: #e0e0e0;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(0, 100, 200, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 60%, rgba(0, 200, 255, 0.1) 0%, transparent 25%);
    line-height: 1.7;
}
a { color: #00b4ff; }
img { max-width: 100%; }
header {
    background-color: rgba(10, 14, 23, 0.92);
    backdrop-filter: blur(10px);
    padding: 14px 5%;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0, 180, 255, 0.3);
}
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    gap: 10px;
}
.logo img { height: 40px; }
.logo span {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(45deg, #00b4ff, #00f2fe);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.nav-links {
    display: flex;
    list-style: none;
    flex-wrap: wrap;
    gap: 6px 4px;
}
.nav-links a {
    color: #e0e0e0;
    text-decoration: none;
    padding: 6px 10px;
    border-radius: 4px;
}
.nav-links a:hover, .nav-links a.is-active {
    color: #00b4ff;
    background: rgba(0, 180, 255, 0.1);
}
.nav-login {
    border: 1px solid #00b4ff;
    color: #00b4ff;
    padding: 8px 18px;
    border-radius: 20px;
    text-decoration: none;
    white-space: nowrap;
}
.nav-login:hover { background: rgba(0, 180, 255, 0.2); }
main { padding: 24px 5% 80px; max-width: 1180px; margin: 0 auto; }
body.is-home main { max-width: 1120px; }
.hero { text-align: center; padding: 40px 0 28px; }
.hero h1, .page-hero h1 {
    font-size: 2.15rem;
    margin-bottom: 14px;
    color: #f4f7fb;
    font-weight: 650;
    letter-spacing: 0.02em;
    line-height: 1.25;
}
.hero .lead { font-size: 1.12rem; max-width: 720px; margin: 0 auto 22px; color: #a8b0c0; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-band {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
    align-items: center;
    padding: 36px 0 20px;
}
.hero-copy { text-align: left; }
.eyebrow {
    color: #6ec8ee;
    font-size: 0.88rem;
    letter-spacing: 0.12em;
    margin-bottom: 14px;
}
.hero-copy h1 {
    font-size: clamp(2rem, 4vw, 2.85rem);
    line-height: 1.22;
    color: #f7fbff;
    font-weight: 700;
    margin-bottom: 18px;
    letter-spacing: 0.01em;
}
.hero-copy .lead {
    font-size: 1.12rem;
    color: #b4bcc8;
    max-width: 34em;
    margin-bottom: 26px;
}
.hero-copy .hero-actions { justify-content: flex-start; }
.hero-note { margin-top: 16px; color: #7a8494; font-size: 0.92rem; }
.hero-visual {
    margin: 0;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(0, 180, 255, 0.28);
    box-shadow: 0 24px 60px rgba(0, 20, 40, 0.45);
    background: #101828;
}
.hero-visual img { display: block; width: 100%; height: 340px; object-fit: cover; }
.hero-visual figcaption {
    padding: 12px 16px 14px;
    color: #9aa8bc;
    font-size: 0.88rem;
    background: rgba(8, 14, 24, 0.92);
}
.scene-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 12px 0 8px;
}
.scene-row figure {
    margin: 0;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid rgba(0, 180, 255, 0.18);
    background: #121a28;
}
.scene-row img { display: block; width: 100%; height: 168px; object-fit: cover; }
.scene-row figcaption {
    text-align: center;
    padding: 10px 8px 12px;
    color: #c8d4e0;
    font-size: 0.92rem;
}
.use-n {
    display: block;
    color: #00d4ff;
    font-weight: 700;
    letter-spacing: 0.08em;
    margin-bottom: 8px;
    font-size: 0.85rem;
}
.center-row { text-align: center; margin-top: 28px; }
.story-band {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    align-items: center;
}
.story-copy h2 { color: #fff; font-size: 1.7rem; margin-bottom: 14px; }
.story-copy p { color: #b0b8c4; margin-bottom: 22px; }
.story-band figure { margin: 0; border-radius: 16px; overflow: hidden; }
.story-band img { display: block; width: 100%; height: 240px; object-fit: cover; }
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    font-size: 1.05rem;
}
.btn-primary {
    background: linear-gradient(45deg, #00b4ff, #00f2fe);
    color: #0a0e17;
    box-shadow: 0 0 20px rgba(0, 180, 255, 0.45);
}
.btn-ghost {
    border: 1px solid #00b4ff;
    color: #00b4ff;
}
.section { margin: 56px 0; }
.section-title {
    text-align: center;
    margin-bottom: 28px;
    font-size: 1.85rem;
    color: #fff;
}
.section-desc { text-align: center; color: #a0a0b0; max-width: 820px; margin: -12px auto 28px; }
.grid-3, .grid-2, .experiment-grid {
    display: grid;
    gap: 22px;
}
.grid-3 { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); }
.experiment-grid { grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.card {
    background: rgba(20, 25, 40, 0.75);
    border-radius: 14px;
    border: 1px solid rgba(0, 180, 255, 0.2);
    padding: 22px;
    text-decoration: none;
    color: inherit;
    display: block;
    transition: transform 0.2s, border-color 0.2s;
}
a.card:hover, .card:hover {
    transform: translateY(-6px);
    border-color: rgba(0, 180, 255, 0.55);
}
.card h3 { color: #fff; margin-bottom: 10px; font-size: 1.2rem; }
.card p { color: #a0a0b0; font-size: 0.95rem; }
.card .more { margin-top: 12px; color: #00b4ff; font-weight: 600; }
.experiment-card { padding: 0; overflow: hidden; }
.experiment-card img { width: 100%; height: 150px; object-fit: cover; display: block; }
.experiment-card .pad { padding: 16px 18px 20px; }
.lab-cover {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-height: 168px;
    padding: 16px 18px;
    color: #fff;
    background: linear-gradient(145deg, #16324a, #0c1a28);
}
.lab-cover.sm { min-height: 128px; }
.lab-cover .k { font-size: 0.75rem; letter-spacing: 0.08em; opacity: 0.75; }
.lab-cover strong { display: block; font-size: 1.08rem; margin: 6px 0 4px; line-height: 1.35; }
.lab-cover em { font-style: normal; font-size: 0.8rem; opacity: 0.8; }
.lab-cover.acoustic { background: linear-gradient(145deg, #1c4d4a, #0b2428); }
.lab-cover.optical { background: linear-gradient(145deg, #2a3d6e, #12182c); }
.lab-cover.thermal { background: linear-gradient(145deg, #5a3a28, #1c1410); }
.lab-cover.power { background: linear-gradient(145deg, #3a4a1c, #12180c); }
.lab-cover.electricity, .lab-cover.elec { background: linear-gradient(145deg, #1c3d62, #0c1520); }
.lab-cover.magnet { background: linear-gradient(145deg, #3a2260, #140c24); }
.experiment-card .lab-cover { margin: 0; border-radius: 0; }
.prose .lab-cover { border-radius: 12px; margin-bottom: 18px; min-height: 200px; }
.prose img.shot { width: 100%; max-height: 320px; object-fit: cover; border-radius: 12px; margin: 8px 0 20px; }
.crumb { color: #808090; font-size: 0.9rem; margin-bottom: 18px; }
.crumb a { color: #00b4ff; text-decoration: none; }
.prose h2 { color: #fff; margin: 28px 0 12px; font-size: 1.45rem; }
.prose h3 { color: #00b4ff; margin: 20px 0 10px; }
.prose p, .prose li { color: #c8c8d0; margin-bottom: 12px; }
.prose ul, .prose ol { padding-left: 1.3em; margin-bottom: 16px; }
.prose blockquote {
    border-left: 3px solid #00b4ff;
    padding: 8px 16px;
    color: #b8d4e8;
    margin: 16px 0;
}
.prose img { border-radius: 12px; margin: 16px 0; }
.chapter { margin-bottom: 36px; }
.chapter h2 { color: #00b4ff; font-size: 1.25rem; margin-bottom: 12px; border-bottom: 1px solid rgba(0,180,255,.2); padding-bottom: 6px; }
.lab-list { list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 8px 16px; }
.lab-list a { color: #d0e8f8; text-decoration: none; }
.lab-list a:hover { color: #00f2fe; }
.meta { color: #808090; font-size: 0.9rem; margin-bottom: 16px; }
.cta-row { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
footer {
    margin-top: 40px;
    padding: 56px 5% 36px;
    background:
        radial-gradient(ellipse at 50% 0%, rgba(0, 140, 220, 0.16), transparent 55%),
        linear-gradient(180deg, #070b14 0%, #05070c 100%);
    border-top: 1px solid rgba(120, 190, 230, 0.18);
}
.site-foot {
    max-width: 720px;
    margin: 0 auto;
    text-align: center;
}
.foot-brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}
.foot-brand img { height: 36px; }
.foot-brand span {
    font-size: 1.35rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    background: linear-gradient(90deg, #7ad4ff, #e8f7ff 55%, #7ad4ff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.foot-motto {
    margin: 18px 0 0;
    color: #8a96a8;
    letter-spacing: 0.28em;
    font-size: 0.92rem;
}
.foot-line {
    width: 88px;
    height: 1px;
    margin: 22px auto 18px;
    background: linear-gradient(90deg, transparent, #6ec8ee, transparent);
}
.foot-copy { color: #5c6674; font-size: 0.82rem; letter-spacing: 0.04em; }
.float-mp {
    position: fixed; right: 16px; top: 50%; transform: translateY(-50%);
    z-index: 900; width: 52px; background: linear-gradient(135deg, #00b4ff, #00f2fe);
    border-radius: 12px 0 0 12px; color: #fff; text-align: center; padding: 12px 6px;
    text-decoration: none; font-size: 14px; writing-mode: vertical-rl; letter-spacing: 2px; font-weight: 700;
}
.qr-panel {
    display: none; position: fixed; right: 76px; top: 50%; transform: translateY(-50%);
    z-index: 899; background: #fff; border-radius: 16px; padding: 16px; text-align: center; color: #222;
}
.float-mp:hover + .qr-panel, .qr-panel:hover { display: block; }
.value-num { font-size: 1.6rem; color: #00f2fe; font-weight: 700; }
@media (max-width: 860px) {
    .hero-band, .story-band, .scene-row { grid-template-columns: 1fr; }
    .hero-visual img { height: 240px; }
    .scene-row img { height: 180px; }
}
@media (max-width: 768px) {
    .hero h1, .page-hero h1 { font-size: 1.65rem; }
    .hero-copy h1 { font-size: 1.85rem; }
    .nav-links { width: 100%; }
    .float-mp { display: none; }
}