/* 字体：使用你提供的 Comfortaa-Light，无法加载时回退系统字体 */
@font-face {
    font-family: 'ComfortaaLight';
    src: url('assets/fonts/Comfortaa-Light.ttf') format('truetype');
    font-weight: 300;
    font-style: normal;
    font-display: swap;
}

:root {
    --bg: #fafafa;
    /* 接近白但不是纯白 */
    --bg-elev: #ffffff;
    --text: #111111;
    --text-muted: #6b7280;
    --link: #0071e3;
    --border: #e5e7eb;
    --shadow: 0 10px 30px rgba(0, 0, 0, .06);
    --radius: 24px;
    --container: 1200px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0b0b0c;
        --bg-elev: #111214;
        --text: #f3f4f6;
        --text-muted: #a1a1aa;
        --link: #2997ff;
        --border: #1f2937;
        --shadow: 0 10px 30px rgba(0, 0, 0, .3);
    }
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    margin: 0;
    font-family: ComfortaaLight, -apple-system, BlinkMacSystemFont, "SF Pro Text",
        "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Hiragino Sans GB",
        "Noto Sans CJK SC", "Source Han Sans SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--link);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

/* 顶部导航 */
.nav {
    position: sticky;
    top: 0;
    z-index: 50;
    backdrop-filter: saturate(180%) blur(14px);
    background: color-mix(in oklab, var(--bg) 80%, transparent);
    border-bottom: 1px solid var(--border);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo {
    font-size: 22px;
    line-height: 1;
    color: var(--text);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-links a {
    color: var(--text);
    opacity: .9;
}

.nav-links a:hover {
    opacity: 1;
}

.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: none;
    background: transparent;
    padding: 8px;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    height: 2px;
    background: var(--text);
    margin: 6px 0;
    transition: .25s;
}

/* Hero */
.hero {
    position: relative;
    min-height: calc(100svh - 56px);
    display: grid;
    place-items: center;
    overflow: hidden;
}

.hero-inner {
    text-align: center;
    padding: 80px 0;
}

.headline {
    font-size: clamp(32px, 6vw, 64px);
    letter-spacing: -0.02em;
    margin: 0 0 12px;
}

.subhead {
    font-size: clamp(16px, 2.2vw, 20px);
    color: var(--text-muted);
    margin: 0 0 28px;
}

.cta-row {
    display: flex;
    gap: 14px;
    justify-content: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: 999px;
    border: 1px solid var(--border);
    transition: transform .2s ease, background-color .2s ease, border-color .2s ease;
    font-weight: 600;
}

.btn.primary {
    background: var(--text);
    color: var(--bg);
    border-color: var(--text);
}

.btn.primary:hover {
    transform: translateY(-2px);
}

.btn.ghost {
    background: transparent;
    color: var(--text);
}

.btn.ghost:hover {
    background: color-mix(in oklab, var(--text) 8%, transparent);
}

/* Hero 装饰 */
.hero-art {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(60% 40% at 50% 20%, color-mix(in oklab, var(--link) 25%, transparent) 0%, transparent 60%),
        radial-gradient(50% 35% at 20% 80%, color-mix(in oklab, #a855f7 20%, transparent) 0%, transparent 60%),
        radial-gradient(45% 30% at 80% 70%, color-mix(in oklab, #22d3ee 20%, transparent) 0%, transparent 60%);
    filter: blur(40px) saturate(130%);
    opacity: .35;
    pointer-events: none;
}

/* 产品 Panel */
.panel {
    padding: 72px 0;
}

.panel.light {
    background: var(--bg);
}

.panel.dark {
    background: var(--bg-elev);
}

.panel-inner {
    display: grid;
    grid-template-columns: 1.1fr .9fr;
    gap: 40px;
    align-items: center;
}

.panel-copy h2 {
    font-size: clamp(28px, 4vw, 48px);
    margin: 0 0 10px;
}

.panel-copy p {
    color: var(--text-muted);
    margin: 0 0 18px;
}

.link {
    font-weight: 600;
    margin-right: 16px;
}

.link.invert {
    color: #cfe2ff;
}

.panel-art {
    height: 400px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    background: linear-gradient(145deg, #f4f4f5, #eaeef7);
}

.gradient-blue {
    background: linear-gradient(145deg, #dbeafe, #eff6ff);
}

.gradient-silver {
    background: linear-gradient(145deg, #eeeeee, #d9d9d9);
}

.gradient-purple {
    background: linear-gradient(145deg, #ede9fe, #f5f3ff);
}

.gradient-green {
    background: linear-gradient(145deg, #dcfce7, #ecfdf5);
}

/* 两列卡片 */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin: 72px auto;
}

.card {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: var(--bg-elev);
    overflow: hidden;
    box-shadow: var(--shadow);
    display: grid;
    grid-template-rows: auto 220px;
}

.card-copy {
    padding: 24px;
}

.card-copy h3 {
    margin: 0 0 8px;
    font-size: 28px;
}

.card-copy p {
    margin: 0 0 12px;
    color: var(--text-muted);
}

.card-art {
    width: 100%;
    height: 100%;
}

/* 配件横幅 */
.band {
    background: linear-gradient(180deg, color-mix(in oklab, var(--text) 6%, transparent), transparent);
    padding: 84px 0;
}

.band-inner {
    text-align: center;
}

.band-inner h2 {
    margin: 0 0 8px;
    font-size: clamp(26px, 3.2vw, 40px);
}

.band-inner p {
    margin: 0 0 18px;
    color: var(--text-muted);
}

/* 脚注 */
.footnote {
    padding: 60px 0;
}

.footnote-inner {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.footnote h4 {
    margin: 0 0 10px;
    font-size: 16px;
}

.footnote ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footnote li {
    margin: 8px 0;
}

.footnote a {
    color: var(--text-muted);
}

.footnote a:hover {
    color: var(--text);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 18px 0;
    background: var(--bg);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-links {
    display: flex;
    gap: 16px;
}

/* Reveal 动画 */
.reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity .5s ease, transform .6s ease;
}

.reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式 */
@media (max-width: 1024px) {
    .panel-inner {
        grid-template-columns: 1fr;
    }

    .panel-art {
        height: 320px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-toggle {
        display: block;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 420px) {
    .panel {
        padding: 56px 0;
    }

    .hero-inner {
        padding: 56px 0;
    }
}