/* ===== 格翰 GEHAN · 官网样式 ===== */
/* ---------- 基础变量 ---------- */
:root {
    --c-primary: #0EA5B7;       /* 主青蓝 */
    --c-primary-dark: #0B7C8A;
    --c-accent: #C9A96E;       /* 高端金 */
    --c-ink: #0F172A;          /* 主文字 */
    --c-ink-2: #475569;        /* 次文字 */
    --c-muted: #94A3B8;
    --c-line: #E2E8F0;
    --c-bg: #FFFFFF;
    --c-bg-soft: #F6FBFC;
    --c-bg-deep: #0B2A33;
    --shadow-sm: 0 4px 16px rgba(15, 42, 51, .06);
    --shadow-md: 0 14px 40px rgba(15, 42, 51, .10);
    --shadow-lg: 0 30px 80px rgba(11, 124, 138, .18);
    --radius: 18px;
    --ease: cubic-bezier(.22, .61, .36, 1);
    --container: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    color: var(--c-ink);
    background: var(--c-bg);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 34px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: .04em;
    transition: all .35s var(--ease);
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    box-shadow: 0 10px 30px rgba(14, 165, 183, .35);
}
.btn-primary::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255,255,255,.35) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform .6s var(--ease);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 38px rgba(14, 165, 183, .45); }
.btn-primary:hover::after { transform: translateX(100%); }
.btn-outline {
    border: 1.5px solid rgba(255,255,255,.7);
    color: #fff;
    backdrop-filter: blur(4px);
}
.btn-outline:hover { background: rgba(255,255,255,.12); transform: translateY(-3px); }
.btn-ghost {
    padding: 10px 24px;
    border: 1.5px solid var(--c-primary);
    color: var(--c-primary);
    background: transparent;
}
.btn-ghost:hover { background: var(--c-primary); color: #fff; }
.btn-block { width: 100%; }

/* ---------- 顶部导航 ---------- */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    padding: 22px 0;
    transition: all .4s var(--ease);
}
.header.scrolled {
    padding: 14px 0;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(14px);
    box-shadow: 0 4px 24px rgba(15,42,51,.06);
}
.nav-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #fff;
    transition: color .4s var(--ease);
}
.header.scrolled .logo { color: var(--c-ink); }
.logo-mark {
    width: 42px; height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    font-family: "Noto Serif SC", serif;
    font-weight: 700;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 8px 20px rgba(14,165,183,.4);
}
.logo-mark sub { font-size: 11px; vertical-align: sub; }
.logo-text {
    font-family: "Noto Serif SC", serif;
    font-weight: 700;
    font-size: 19px;
    line-height: 1.2;
}
.logo-text em {
    display: block;
    font-style: normal;
    font-size: 10px;
    letter-spacing: .25em;
    color: var(--c-muted);
    font-family: "Noto Sans SC", sans-serif;
    font-weight: 400;
}
.nav { display: flex; gap: 4px; }
.nav-link {
    padding: 8px 16px;
    font-size: 15px;
    color: rgba(255,255,255,.85);
    position: relative;
    transition: color .3s var(--ease);
}
.header.scrolled .nav-link { color: var(--c-ink-2); }
.nav-link::after {
    content: "";
    position: absolute;
    bottom: 2px; left: 50%;
    width: 0; height: 2px;
    background: var(--c-accent);
    transition: all .35s var(--ease);
    transform: translateX(-50%);
}
.nav-link:hover, .nav-link.active { color: var(--c-primary); }
.nav-link:hover::after, .nav-link.active::after { width: 20px; }
.nav-cta { margin-left: 8px; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 28px;
    padding: 6px 0;
}
.nav-toggle span {
    height: 2px; width: 100%;
    background: #fff;
    transition: all .3s var(--ease);
}
.header.scrolled .nav-toggle span { background: var(--c-ink); }
.mobile-menu {
    display: none;
    flex-direction: column;
    background: #fff;
    padding: 16px 24px;
    box-shadow: 0 20px 40px rgba(15,42,51,.12);
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
    padding: 14px 0;
    border-bottom: 1px solid var(--c-line);
    color: var(--c-ink);
    font-size: 16px;
}
.mobile-menu a:last-child { border-bottom: none; }

/* ---------- Hero Banner ---------- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: -10% 0;
    background-size: cover;
    background-position: center;
    will-change: transform;
}
.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(110deg, rgba(8,40,48,.92) 0%, rgba(11,80,90,.72) 45%, rgba(14,165,183,.35) 100%);
}
.hero-content {
    position: relative;
    z-index: 2;
    color: #fff;
    padding-top: 80px;
    max-width: 820px;
}
.hero-eyebrow {
    font-size: 13px;
    letter-spacing: .35em;
    color: var(--c-accent);
    margin-bottom: 24px;
    font-weight: 500;
}
.hero-title {
    font-family: "Noto Serif SC", serif;
    font-size: clamp(40px, 6.5vw, 84px);
    line-height: 1.1;
    font-weight: 700;
    margin-bottom: 28px;
    letter-spacing: .02em;
}
.title-accent {
    display: inline-block;
    margin-left: 18px;
    background: linear-gradient(120deg, #fff, var(--c-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}
.hero-desc {
    font-size: clamp(15px, 1.4vw, 18px);
    color: rgba(255,255,255,.85);
    margin-bottom: 40px;
    line-height: 1.9;
}
.hero-actions { display: flex; gap: 18px; flex-wrap: wrap; margin-bottom: 70px; }
.hero-stats {
    display: flex;
    gap: 56px;
    flex-wrap: wrap;
    padding-top: 36px;
    border-top: 1px solid rgba(255,255,255,.18);
}
.stat { display: flex; flex-direction: column; }
.stat .num {
    font-family: "Noto Serif SC", serif;
    font-size: 42px;
    font-weight: 700;
    color: #fff;
    line-height: 1;
}
.stat .lab {
    font-size: 13px;
    color: rgba(255,255,255,.7);
    margin-top: 8px;
    letter-spacing: .08em;
}
.scroll-cue {
    position: absolute;
    bottom: 36px; left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}
.mouse {
    display: block;
    width: 26px; height: 42px;
    border: 2px solid rgba(255,255,255,.6);
    border-radius: 14px;
    position: relative;
}
.wheel {
    position: absolute;
    top: 8px; left: 50%;
    width: 4px; height: 8px;
    background: #fff;
    border-radius: 2px;
    transform: translateX(-50%);
    animation: wheel 1.8s var(--ease) infinite;
}
@keyframes wheel {
    0% { opacity: 0; transform: translate(-50%, -6px); }
    50% { opacity: 1; }
    100% { opacity: 0; transform: translate(-50%, 16px); }
}

/* ---------- 滚动条带 ---------- */
.strip {
    background: var(--c-bg-deep);
    color: rgba(255,255,255,.78);
    padding: 18px 0;
    overflow: hidden;
}
.strip-inner {
    display: flex;
    gap: 56px;
    white-space: nowrap;
    font-size: 14px;
    letter-spacing: .12em;
    animation: marquee 28s linear infinite;
    width: max-content;
}
.strip-item { color: rgba(255,255,255,.78); }
@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ---------- 通用 Section ---------- */
.section { padding: 120px 0; }
.section-head { text-align: center; max-width: 760px; margin: 0 auto 70px; }
.section-eyebrow {
    font-size: 13px;
    letter-spacing: .3em;
    color: var(--c-primary);
    font-weight: 500;
    margin-bottom: 18px;
}
.section-title {
    font-family: "Noto Serif SC", serif;
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    line-height: 1.25;
    color: var(--c-ink);
    margin-bottom: 22px;
}
.t-accent { color: var(--c-primary); }
.section-sub {
    color: var(--c-ink-2);
    font-size: 16px;
    line-height: 1.9;
}

/* ---------- 氢科普 ---------- */
.philosophy { background: var(--c-bg-soft); }
.phil-grid {
    display: grid;
    grid-template-columns: 1fr 1.15fr;
    gap: 80px;
    align-items: center;
}
.phil-media {
    position: relative;
    height: 540px;
    padding: 0 40px 40px 0;
}
.phil-img {
    width: 100%; height: 100%;
    background-color: #fff;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    transition: transform .8s var(--ease);
}
.phil-caption {
    position: absolute;
    bottom: 18px; left: 24px;
    font-size: 12px;
    letter-spacing: .12em;
    color: var(--c-muted);
    background: rgba(255,255,255,.88);
    padding: 6px 14px;
    border-radius: 20px;
    backdrop-filter: blur(4px);
}
.phil-media:hover .phil-img { transform: scale(1.02) rotate(-.5deg); }
.phil-ring {
    position: absolute;
    top: -24px; right: -24px;
    width: 160px; height: 160px;
    border: 2px solid rgba(14,165,183,.25);
    border-radius: 50%;
    animation: ringFloat 6s ease-in-out infinite;
}
.phil-dot {
    position: absolute;
    border-radius: 50%;
    background: var(--c-accent);
    opacity: .85;
}
.phil-dot.d1 { width: 14px; height: 14px; top: 18%; right: 6%; animation: dotFloat 4s ease-in-out infinite; }
.phil-dot.d2 { width: 10px; height: 10px; top: 60%; right: 2%; animation: dotFloat 5s ease-in-out infinite .8s; }
.phil-dot.d3 { width: 18px; height: 18px; bottom: 8%; right: 12%; animation: dotFloat 4.5s ease-in-out infinite 1.6s; }
@keyframes ringFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-14px); }
}
@keyframes dotFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
.phil-desc {
    color: var(--c-ink-2);
    font-size: 16px;
    line-height: 1.95;
    margin-bottom: 36px;
    padding-left: 16px;
    border-left: 3px solid var(--c-accent);
}
.phil-points { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

/* ---------- 通用要点卡 ---------- */
.point {
    display: flex;
    gap: 18px;
    align-items: flex-start;
}
.point-ico {
    flex-shrink: 0;
    width: 52px; height: 52px;
    border-radius: 14px;
    background: linear-gradient(135deg, rgba(14,165,183,.12), rgba(14,165,183,.04));
    color: var(--c-primary);
    font-family: "Noto Serif SC", serif;
    font-size: 22px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .4s var(--ease);
}
.point:hover .point-ico {
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    transform: rotate(-6deg) scale(1.05);
}
.point h4 {
    font-family: "Noto Serif SC", serif;
    font-size: 18px;
    color: var(--c-ink);
    margin-bottom: 6px;
}
.point p { color: var(--c-ink-2); font-size: 14px; line-height: 1.8; }

/* ---------- 产品中心 ---------- */
.products { background: #fff; }
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 36px;
}
.product-card {
    background: #fff;
    border: 1px solid var(--c-line);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all .5s var(--ease);
    display: flex;
    flex-direction: column;
}
.product-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}
.product-media {
    position: relative;
    aspect-ratio: 4/3;
    overflow: hidden;
    background: linear-gradient(165deg, #FFFFFF 55%, #EFF7F9 100%);
}
.product-media img {
    width: 100%; height: 100%;
    object-fit: contain;
    padding: 18px;
    transition: transform .8s var(--ease);
}
.product-card:hover .product-media img { transform: scale(1.05); }

/* 多场景使用 */
.scene-block { margin-top: 80px; }
.scene-eyebrow {
    font-size: 12px; letter-spacing: .2em;
    color: var(--c-muted); text-align: center;
    margin-bottom: 28px;
}
.scene-grid {
    display: grid; gap: 24px;
    grid-template-columns: repeat(3, 1fr);
}
.scene-card {
    background: #fff; border-radius: var(--radius);
    box-shadow: 0 2px 16px rgba(0,36,60,.06);
    overflow: hidden; transition: transform .6s var(--ease), box-shadow .6s var(--ease);
}
.scene-card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(0,36,60,.12); }
.scene-media {
    position: relative; aspect-ratio: 16/10;
    background-color: #fff;
    background-size: cover; background-position: center;
    overflow: hidden;
}
.scene-tag {
    position: absolute; top: 16px; left: 16px;
    background: rgba(255,255,255,.92); backdrop-filter: blur(4px);
    color: var(--c-primary); font-size: 12px;
    padding: 4px 12px; border-radius: 20px;
    letter-spacing: .1em;
}
.scene-body { padding: 22px 24px 26px; }
.scene-body h4 {
    font-size: 17px; font-weight: 600;
    color: var(--c-text); margin-bottom: 8px;
}
.scene-body p {
    font-size: 14px; color: var(--c-muted);
    line-height: 1.7;
}

.product-body {
    position: absolute;
    top: 20px; left: 20px;
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(6px);
    color: var(--c-primary-dark);
    font-size: 12px;
    letter-spacing: .1em;
    padding: 7px 16px;
    border-radius: 30px;
    font-weight: 500;
}
.product-body { padding: 32px 30px 26px; flex: 1; display: flex; flex-direction: column; }
.product-name {
    font-family: "Noto Serif SC", serif;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--c-ink);
}
.product-name em {
    font-style: normal;
    font-size: 16px;
    color: var(--c-primary);
    margin-left: 4px;
}
.product-desc {
    color: var(--c-ink-2);
    font-size: 14px;
    line-height: 1.85;
    margin-bottom: 20px;
}
.feature-list { margin-bottom: 22px; }
.feature-list li {
    padding: 6px 0;
    color: var(--c-ink);
    font-size: 13.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.feature-list i { color: var(--c-accent); font-style: normal; font-size: 10px; }
.spec-box {
    background: var(--c-bg-soft);
    border-radius: 12px;
    padding: 16px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px 20px;
    margin-bottom: 22px;
}
.spec-item { display: flex; flex-direction: column; }
.spec-item .sk { font-size: 11.5px; color: var(--c-muted); letter-spacing: .05em; }
.spec-item .sv {
    font-family: "Noto Serif SC", serif;
    font-size: 15px;
    font-weight: 700;
    color: var(--c-primary-dark);
}
.product-foot { margin-top: auto; padding-top: 8px; border-top: 1px solid var(--c-line); }
.link-arrow {
    color: var(--c-primary);
    font-weight: 500;
    letter-spacing: .04em;
    transition: all .3s var(--ease);
    display: inline-block;
    padding-top: 16px;
}
.link-arrow:hover { transform: translateX(6px); color: var(--c-primary-dark); }

/* ---------- 核心技术 ---------- */
.technology { background: var(--c-bg-soft); }
.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.tech-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 40px 30px;
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    transition: all .5s var(--ease);
}
.tech-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .5s var(--ease);
}
.tech-card:hover { transform: translateY(-10px); box-shadow: var(--shadow-lg); }
.tech-card:hover::before { transform: scaleX(1); }
.tech-ico {
    width: 64px; height: 64px;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    font-family: "Noto Serif SC", serif;
    font-size: 28px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: 0 12px 26px rgba(14,165,183,.32);
    transition: all .4s var(--ease);
}
.tech-card:hover .tech-ico { transform: rotate(-8deg) scale(1.08); }
.tech-title {
    font-family: "Noto Serif SC", serif;
    font-size: 19px;
    color: var(--c-ink);
    margin-bottom: 12px;
}
.tech-desc { color: var(--c-ink-2); font-size: 14px; line-height: 1.85; }

/* ---------- 关于格翰 ---------- */
.about { background: #fff; }
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 80px;
    align-items: center;
}
.about-media {
    position: relative;
    height: 540px;
}
.about-img {
    position: absolute;
    background-size: cover;
    background-position: center;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}
.about-img-1 {
    top: 0; left: 0;
    width: 70%; height: 70%;
    background-color: #fff;
    background-size: contain;
    background-repeat: no-repeat;
    transition: transform .8s var(--ease);
}
.about-img-2 {
    bottom: 0; right: 0;
    width: 60%; height: 55%;
    border: 6px solid #fff;
    transition: transform .8s var(--ease) .1s;
}
.about-media:hover .about-img-1 { transform: translateY(-8px); }
.about-media:hover .about-img-2 { transform: translateY(8px); }
.about-badge {
    position: absolute;
    top: 20%; right: 8%;
    background: var(--c-accent);
    color: #fff;
    width: 120px; height: 120px;
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 18px 40px rgba(201,169,110,.4);
    z-index: 3;
}
.badge-num {
    font-family: "Noto Serif SC", serif;
    font-size: 28px;
    font-weight: 700;
    line-height: 1;
}
.badge-label { font-size: 11px; letter-spacing: .15em; margin-top: 6px; }
.about-lead {
    color: var(--c-ink-2);
    font-size: 16px;
    line-height: 1.95;
    margin-bottom: 36px;
}
.about-points { display: flex; flex-direction: column; gap: 24px; margin-bottom: 40px; }

/* ---------- 数据统计带 ---------- */
.stats-band {
    background: linear-gradient(135deg, var(--c-bg-deep), #103d47);
    color: #fff;
    padding: 90px 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 40px;
    text-align: center;
}
.stat-block { display: flex; flex-direction: column; align-items: center; }
.big-num {
    font-family: "Noto Serif SC", serif;
    font-size: clamp(38px, 4.5vw, 56px);
    font-weight: 700;
    color: #fff;
    line-height: 1;
    background: linear-gradient(120deg, #fff, var(--c-accent));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.big-lab {
    font-size: 14px;
    color: rgba(255,255,255,.7);
    margin-top: 14px;
    letter-spacing: .08em;
}

/* ---------- 联系方式 ---------- */
.contact { background: var(--c-bg-soft); }
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}
.contact-info .section-head { text-align: left; margin: 0 0 36px; }
.contact-list { display: flex; flex-direction: column; gap: 28px; }
.contact-list li {
    display: flex;
    gap: 20px;
    align-items: center;
    padding: 22px 26px;
    background: #fff;
    border-radius: 14px;
    box-shadow: var(--shadow-sm);
    transition: all .4s var(--ease);
}
.contact-list li:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}
.ci-ico {
    flex-shrink: 0;
    width: 50px; height: 50px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
    color: #fff;
    font-size: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.ci-label {
    display: block;
    font-size: 12px;
    color: var(--c-muted);
    letter-spacing: .12em;
    margin-bottom: 4px;
}
.ci-value {
    font-size: 16px;
    color: var(--c-ink);
    font-weight: 500;
}
a.ci-value:hover { color: var(--c-primary); }

/* 表单 */
.contact-form {
    background: #fff;
    border-radius: var(--radius);
    padding: 44px 40px;
    box-shadow: var(--shadow-md);
}
.form-title {
    font-family: "Noto Serif SC", serif;
    font-size: 24px;
    color: var(--c-ink);
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 16px;
}
.form-title::after {
    content: "";
    position: absolute;
    bottom: 0; left: 0;
    width: 40px; height: 3px;
    background: var(--c-accent);
    border-radius: 2px;
}
.field {
    position: relative;
    margin-bottom: 26px;
}
.field input, .field select, .field textarea {
    width: 100%;
    padding: 14px 4px;
    border: none;
    border-bottom: 1.5px solid var(--c-line);
    background: transparent;
    font-size: 15px;
    color: var(--c-ink);
    font-family: inherit;
    outline: none;
    transition: border-color .35s var(--ease);
    resize: none;
}
.field textarea { padding-top: 18px; }
.field label {
    position: absolute;
    top: 14px; left: 4px;
    color: var(--c-muted);
    font-size: 15px;
    pointer-events: none;
    transition: all .3s var(--ease);
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--c-primary); }
.field input:focus + label,
.field input:not(:placeholder-shown) + label,
.field textarea:focus + label,
.field textarea:not(:placeholder-shown) + label,
.field select:focus + label,
.field select:valid + label {
    top: -10px;
    font-size: 12px;
    color: var(--c-primary);
    letter-spacing: .08em;
}
.field select { color: var(--c-ink); }
.field select:invalid { color: transparent; }
.field select option { color: var(--c-ink); }
.form-tip {
    font-size: 13px;
    margin-top: 16px;
    text-align: center;
    min-height: 18px;
    color: var(--c-primary-dark);
}
.form-tip.error { color: #DC2626; }

/* ---------- 页脚 ---------- */
.footer {
    background: var(--c-bg-deep);
    color: rgba(255,255,255,.7);
    padding: 70px 0 24px;
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,.1);
    flex-wrap: wrap;
}
.footer-brand { display: flex; gap: 16px; max-width: 360px; }
.footer-brand .logo-mark { box-shadow: none; }
.fb-name {
    font-family: "Noto Serif SC", serif;
    color: #fff;
    font-weight: 700;
    font-size: 17px;
    margin-bottom: 8px;
}
.fb-desc { font-size: 13.5px; line-height: 1.8; }
.footer-cols { display: flex; gap: 70px; }
.fcol h5 {
    color: #fff;
    font-size: 14px;
    margin-bottom: 16px;
    letter-spacing: .1em;
    font-weight: 500;
}
.fcol a {
    display: block;
    color: rgba(255,255,255,.6);
    font-size: 13.5px;
    padding: 6px 0;
    transition: color .3s var(--ease);
}
.fcol a:hover { color: var(--c-accent); }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 24px;
    font-size: 12.5px;
    color: rgba(255,255,255,.45);
    flex-wrap: wrap;
    gap: 12px;
}

/* ---------- 返回顶部 ---------- */
.to-top {
    position: fixed;
    bottom: 30px; right: 30px;
    width: 50px; height: 50px;
    border-radius: 50%;
    background: var(--c-primary);
    color: #fff;
    font-size: 22px;
    box-shadow: 0 10px 24px rgba(14,165,183,.4);
    opacity: 0;
    transform: translateY(20px) scale(.8);
    pointer-events: none;
    transition: all .4s var(--ease);
    z-index: 90;
}
.to-top.show {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}
.to-top:hover { background: var(--c-primary-dark); transform: translateY(-4px) scale(1.05); }

/* ---------- Reveal 动画 ---------- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
    .scene-grid { grid-template-columns: repeat(2, 1fr); }
    .tech-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 980px) {
    .nav, .nav-cta { display: none; }
    .nav-toggle { display: flex; }
    .phil-grid { grid-template-columns: 1fr; gap: 60px; }
    .phil-media { height: 420px; padding: 0 24px 24px 0; }
    .phil-points { grid-template-columns: 1fr; }
    .about-grid { grid-template-columns: 1fr; gap: 60px; }
    .about-media { height: 440px; }
    .contact-grid { grid-template-columns: 1fr; gap: 50px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 50px; }
    .footer-inner { flex-direction: column; gap: 36px; }
    .footer-cols { gap: 40px; }
}
@media (max-width: 640px) {
    .section { padding: 80px 0; }
    .hero-stats { gap: 30px; }
    .stat .num { font-size: 32px; }
    .phil-media { height: 320px; }
    .about-media { height: 360px; }
    .about-badge { width: 92px; height: 92px; }
    .badge-num { font-size: 22px; }
    .contact-form { padding: 32px 24px; }
    .product-body { padding: 28px 22px; }
    .scene-grid { grid-template-columns: 1fr; }
    .tech-grid { grid-template-columns: 1fr; }
    .footer-cols { flex-wrap: wrap; gap: 30px; }
    .footer-bottom { flex-direction: column; }
}