/* ============================================================
   义缘聚科技 — 暗色流光主题
   统一暗色调 · 流光点缀 · 克制留白
   ============================================================ */
:root {
    --accent: #40d4a0;
    --accent-light: #80f0c8;
    --bg: #0a1018;
    --bg-surface: #151d28;
    --text-1: rgba(255,255,255,0.92);
    --text-2: rgba(255,255,255,0.50);
    --text-3: rgba(255,255,255,0.28);
    --glass: rgba(255,255,255,0.04);
    --glass-border: rgba(255,255,255,0.08);
    --glass-hover: rgba(255,255,255,0.07);
    --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Microsoft YaHei", sans-serif;
    --nav-h: 56px;
    --r: 24px;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font); color: var(--text-1); line-height: 1.6;
    background: var(--bg);
    -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
/* 全局噪点纹理 — 叠在 hero 以下的区域 */
body::after {
    content: "";
    position: fixed; inset: 0; z-index: 9999;
    pointer-events: none;
    opacity: 0.06;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 200px 200px;
}
/* 柔光斑 — 固定背景色块 */
body::before {
    content: "";
    position: fixed; inset: 0; z-index: -1;
    pointer-events: none;
    background:
        radial-gradient(ellipse 600px 600px at 15% 30%, rgba(64,212,160,0.06) 0%, transparent 70%),
        radial-gradient(ellipse 500px 500px at 85% 25%, rgba(120,140,255,0.05) 0%, transparent 70%),
        radial-gradient(ellipse 700px 700px at 70% 70%, rgba(160,100,220,0.04) 0%, transparent 70%),
        radial-gradient(ellipse 550px 550px at 25% 80%, rgba(255,180,120,0.04) 0%, transparent 70%);
}
/* 鼠标光晕 */
.cursor-glow {
    position: fixed; width: 400px; height: 400px;
    border-radius: 50%; pointer-events: none;
    background: radial-gradient(circle, rgba(64,212,160,0.07) 0%, rgba(120,140,255,0.03) 40%, transparent 70%);
    transform: translate(-50%, -50%);
    z-index: 1; opacity: 0;
    transition: opacity 0.4s;
    will-change: left, top;
}
.cursor-glow.visible { opacity: 1; }

/* 星点画布 */
.stars-canvas {
    position: fixed; inset: 0;
    width: 100%; height: 100%;
    pointer-events: none; z-index: 0;
}

a { text-decoration: none; color: inherit; }
.container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

/* ============================================================
   导航 — 暗色悬浮胶囊
   ============================================================ */
.navbar {
    position: fixed; top: 16px; left: 50%; transform: translateX(-50%);
    z-index: 100; width: calc(100% - 48px); max-width: 960px;
    height: var(--nav-h);
    background: rgba(12,12,22,0.5);
    backdrop-filter: blur(28px) saturate(150%);
    -webkit-backdrop-filter: blur(28px) saturate(150%);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 100px;
    box-shadow: 0 4px 40px rgba(0,0,0,0.3);
}
.nav-container {
    padding: 0 32px; height: 100%;
    display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
    display: flex; align-items: center; gap: 10px;
    font-weight: 700; font-size: 16px; color: var(--text-1);
}
.logo-icon {
    width: 32px; height: 32px; border-radius: 9px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #fff; display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 14px;
    box-shadow: 0 2px 16px rgba(64, 212, 160, 0.3);
}
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
    font-size: 14px; color: var(--text-2); font-weight: 500;
    transition: color 0.3s; letter-spacing: 0.01em;
}
.nav-links a:hover { color: var(--text-1); }
.nav-links a.active { color: var(--accent-light); }
.lang-toggle {
    padding: 5px 14px; border-radius: 14px;
    border: 1px solid rgba(255,255,255,0.08);
    background: var(--glass); color: var(--text-2);
    font-size: 12px; font-weight: 600; cursor: pointer;
    transition: all 0.3s; letter-spacing: 0.02em;
}
.lang-toggle:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.nav-menu-btn { display: none; background: none; border: none; cursor: pointer; padding: 4px; }
.nav-menu-btn span {
    display: block; width: 20px; height: 1.5px; background: var(--text-2);
    margin: 4px 0; border-radius: 2px;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    padding: 140px 24px 100px;
    text-align: center;
    position: relative; overflow: hidden;
    background: var(--bg);
}
.hero-canvas {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    pointer-events: none;
}

/* ============================================================
   Hero 文字
   ============================================================ */
.hero-content {
    max-width: 800px; position: relative; z-index: 2;
    padding: 80px 50px 60px;
    background: radial-gradient(ellipse at center, rgba(3,10,6,0.45) 0%, rgba(3,10,6,0.15) 50%, transparent 100%);
    border-radius: 40px;
}
.hero-badge {
    display: inline-block;
    padding: 7px 22px; border-radius: 50px;
    background: rgba(80, 220, 160, 0.06);
    border: 1px solid rgba(80, 220, 160, 0.15);
    font-size: 12px; font-weight: 600; color: rgba(140, 240, 200, 0.8);
    letter-spacing: 0.08em; text-transform: uppercase;
    margin-bottom: 36px;
}

/* 标题 */
.hero-title {
    font-size: clamp(32px, 6vw + 8px, 72px); font-weight: 800; line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 28px; position: relative;
    text-align: center;
    display: flex; flex-direction: column; align-items: center;
    text-shadow: 0 0 40px rgba(0, 0, 0, 0.5), 0 0 80px rgba(80, 220, 160, 0.1);
}

.hero-line {
    display: block; text-align: center;
}

/* 打字机逐字入场 */
.hero-title .char {
    display: inline-block;
    opacity: 0;
    background: linear-gradient(
        90deg,
        rgba(255,255,255,0.95) 0%,
        rgba(100,220,255,0.9) 12%,
        rgba(255,255,255,0.95) 20%,
        rgba(120,255,180,0.9) 32%,
        rgba(200,255,240,1) 40%,
        rgba(200,140,255,0.9) 52%,
        rgba(255,255,255,0.95) 60%,
        rgba(255,180,120,0.9) 72%,
        rgba(255,255,255,0.95) 80%,
        rgba(120,200,255,0.9) 90%,
        rgba(255,255,255,0.95) 100%
    );
    background-size: 400% 100%;
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 8s linear infinite;
}
.hero-title .char.typed {
    opacity: 1;
}
@keyframes shimmer {
    0% { background-position: 400% 0; }
    100% { background-position: 0% 0; }
}


.hero p {
    font-size: 17px; line-height: 1.9;
    margin-bottom: 48px;
    max-width: 700px; margin-left: auto; margin-right: auto;
    white-space: nowrap;
    background: linear-gradient(
        90deg,
        rgba(255,255,255,0.5) 0%,
        rgba(120,230,200,0.6) 25%,
        rgba(255,255,255,0.5) 40%,
        rgba(180,160,255,0.6) 60%,
        rgba(255,255,255,0.5) 75%,
        rgba(255,200,140,0.55) 90%,
        rgba(255,255,255,0.5) 100%
    );
    background-size: 300% 100%;
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: subtitleShimmer 10s linear infinite;
    text-shadow: none;
    font-weight: 400;
}
.cta-button {
    display: inline-block; padding: 18px 48px; border-radius: 50px;
    background: linear-gradient(135deg, rgba(64,212,160,0.2), rgba(80,220,160,0.1));
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1.5px solid rgba(80, 220, 160, 0.35);
    color: #fff; font-size: 16px; font-weight: 700;
    letter-spacing: 0.03em;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 0 24px rgba(80, 220, 160, 0.1), inset 0 1px 0 rgba(255,255,255,0.08);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.cta-button::before {
    content: "→";
    margin-left: 8px;
    display: inline-block;
    transition: transform 0.3s;
}
.cta-button:hover {
    background: linear-gradient(135deg, rgba(64,212,160,0.35), rgba(80,220,160,0.2));
    border-color: rgba(80, 220, 160, 0.6);
    transform: translateY(-3px);
    box-shadow: 0 8px 40px rgba(80, 220, 160, 0.18), 0 0 60px rgba(80, 220, 160, 0.08);
}
.cta-button:hover::before {
    transform: translateX(4px);
}

/* 入场动画 */
.anim-fade {
    opacity: 0; transform: translateY(16px);
    animation: fadeUp 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}
.anim-delay-2 { animation-delay: 0.8s; }
.anim-delay-3 { animation-delay: 1.1s; }
@keyframes fadeUp { to { opacity: 1; transform: translateY(0); } }
@keyframes subtitleShimmer {
    0% { background-position: 300% 0; }
    100% { background-position: 0% 0; }
}

/* ============================================================
   区域过渡 — 渐变分隔线
   ============================================================ */
.section-divider {
    height: 1px; border: none;
    background: linear-gradient(90deg, transparent, rgba(64,212,160,0.15), transparent);
}

/* ============================================================
   产品区
   ============================================================ */
.products {
    padding: 120px 0 140px;
    position: relative; overflow: hidden;
    background: var(--bg-surface);
}
/* 顶部渐变过渡 */
.products::before {
    content: ""; position: absolute;
    top: -100px; left: 0; right: 0; height: 500px;
    background: linear-gradient(180deg, var(--bg) 0%, var(--bg) 15%, var(--bg-surface) 100%);
    pointer-events: none; z-index: 0;
}
/* 装饰辉光 — 双层 */
.products::after {
    content: ""; position: absolute;
    top: 40%; left: 50%; transform: translate(-50%, -50%);
    width: 800px; height: 800px;
    background:
        radial-gradient(ellipse at 30% 40%, rgba(64,212,160,0.04) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(120,140,255,0.03) 0%, transparent 50%);
    border-radius: 50%; pointer-events: none;
}

.section-title {
    text-align: center; font-size: 38px; font-weight: 800;
    letter-spacing: -0.02em; margin-bottom: 12px;
    color: var(--text-1); position: relative; z-index: 1;
    display: flex; flex-direction: column; align-items: center;
}
.section-title::after {
    content: "";
    display: block; margin-top: 16px;
    width: 60px; height: 3px; border-radius: 2px;
    background: linear-gradient(90deg, var(--accent), rgba(120,140,255,0.8), var(--accent-light));
    background-size: 200% 100%;
    animation: titleLineShimmer 4s linear infinite;
}
@keyframes titleLineShimmer {
    0% { background-position: 200% 0; }
    100% { background-position: 0% 0; }
}
.section-subtitle {
    text-align: center; font-size: 16px; color: var(--text-2);
    margin-bottom: 64px; position: relative; z-index: 1;
    letter-spacing: 0.02em; line-height: 1.8;
}
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    position: relative; z-index: 1;
    perspective: 800px;
}

/* ============================================================
   产品卡片
   ============================================================ */
.product-card {
    --card-primary: 255,255,255;
    --card-secondary: 255,255,255;
    background: rgba(255,255,255,0.06);
    backdrop-filter: blur(32px) saturate(180%);
    -webkit-backdrop-filter: blur(32px) saturate(180%);
    border-radius: 28px;
    padding: 36px 28px 32px;
    text-align: center;
    border: 1.5px solid rgba(var(--card-primary), 0.25);
    position: relative; overflow: hidden;
    isolation: isolate;
    transition: all 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    opacity: 0; transform: translateY(30px);
    box-shadow: 0 8px 32px rgba(0,0,0,0.2), inset 0 1px 0 rgba(255,255,255,0.1);
    transform-style: preserve-3d;
}
/* 鼠标跟随高光 */
.product-card .card-shine {
    position: absolute; inset: 0; z-index: 3;
    border-radius: inherit; pointer-events: none;
    opacity: 0; transition: opacity 0.3s;
    background: radial-gradient(circle 250px at var(--shine-x, 50%) var(--shine-y, 50%),
        rgba(255,255,255,0.12) 0%, transparent 70%);
}
.product-card:hover .card-shine { opacity: 1; }
.product-card.card-colored {
    background:
        radial-gradient(ellipse at 20% -10%, rgba(var(--card-primary), 0.45) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 110%, rgba(var(--card-secondary), 0.30) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 50%, rgba(var(--card-primary), 0.08) 0%, transparent 80%),
        rgba(var(--card-primary), 0.06);
    border-color: rgba(var(--card-primary), 0.20);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3), 0 4px 48px rgba(var(--card-primary), 0.10), inset 0 1px 0 rgba(255,255,255,0.08);
}
.product-card.card-colored:hover {
    background:
        radial-gradient(ellipse at 20% -10%, rgba(var(--card-primary), 0.60) 0%, transparent 55%),
        radial-gradient(ellipse at 85% 110%, rgba(var(--card-secondary), 0.40) 0%, transparent 55%),
        radial-gradient(ellipse at 50% 50%, rgba(var(--card-primary), 0.12) 0%, transparent 80%),
        rgba(var(--card-primary), 0.10);
    border-color: rgba(var(--card-primary), 0.35);
    box-shadow: 0 24px 64px rgba(0,0,0,0.4), 0 8px 80px rgba(var(--card-primary), 0.18), inset 0 1px 0 rgba(255,255,255,0.12);
}
/* 渐变发光边框 — 已移除，改用 border 实现 */
/* 顶部高光 — 已移除，避免圆角不匹配 */
.product-card.visible {
    opacity: 1; transform: translateY(0) rotateX(0) rotateY(0);
    transition: opacity 0.6s, transform 0.6s;
}
.product-card:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(var(--card-primary), 0.40);
    box-shadow: 0 24px 64px rgba(0,0,0,0.35), 0 0 40px rgba(64,212,160,0.06), inset 0 1px 0 rgba(255,255,255,0.15);
}

.card-bg-icon {
    position: absolute; inset: 0;
    background-size: 200%; background-position: center;
    filter: blur(60px) saturate(1.8) brightness(0.6);
    opacity: 0.5;
    z-index: 0;
    border-radius: inherit;
    clip-path: inset(0 round 28px);
    transition: opacity 0.45s, filter 0.45s;
    pointer-events: none;
}
.product-card:hover .card-bg-icon {
    opacity: 0.65;
    filter: blur(45px) saturate(2) brightness(0.65);
}
.product-card .app-icon-wrap {
    width: 72px; height: 72px; border-radius: 20px; margin: 0 auto 20px;
    position: relative; z-index: 1;
    box-shadow: 0 8px 24px rgba(0,0,0,0.3), 0 0 0 1px rgba(255,255,255,0.15);
    transition: transform 0.4s, box-shadow 0.4s;
    overflow: hidden;
}
.product-card .app-icon-wrap .app-icon {
    width: 100%; height: 100%;
    object-fit: cover; display: block;
}
/* 玻璃高光 */
.product-card .app-icon-wrap::before {
    content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: 2;
    background: linear-gradient(
        145deg,
        rgba(255,255,255,0.45) 0%,
        rgba(255,255,255,0.12) 25%,
        transparent 50%
    );
    pointer-events: none;
}
/* 底部反光 + 边缘光泽 */
.product-card .app-icon-wrap::after {
    content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: 2;
    background:
        linear-gradient(to top, rgba(255,255,255,0.10) 0%, transparent 35%),
        linear-gradient(to right, rgba(255,255,255,0.06) 0%, transparent 15%, transparent 85%, rgba(255,255,255,0.06) 100%);
    pointer-events: none;
}
.product-card:hover .app-icon-wrap {
    transform: scale(1.08);
    box-shadow: 0 12px 36px rgba(0,0,0,0.4), 0 0 20px rgba(var(--card-primary),0.15), 0 0 0 1px rgba(255,255,255,0.18);
}
.product-card .app-icon-placeholder {
    width: 72px; height: 72px; border-radius: 20px; margin: 0 auto 20px;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px; color: #fff; font-weight: 700;
    position: relative;
    box-shadow: 0 8px 28px rgba(0,0,0,0.35), 0 0 0 1px rgba(255,255,255,0.08);
    transition: transform 0.4s, box-shadow 0.4s;
}
/* 玻璃高光 */
.product-card .app-icon-placeholder::before {
    content: ""; position: absolute; inset: 0; border-radius: inherit;
    background: linear-gradient(
        145deg,
        rgba(255,255,255,0.4) 0%,
        rgba(255,255,255,0.1) 30%,
        transparent 60%
    );
    z-index: 1; pointer-events: none;
}
/* 底部反光 */
.product-card .app-icon-placeholder::after {
    content: ""; position: absolute; inset: 0; border-radius: inherit;
    background: linear-gradient(
        to top,
        rgba(255,255,255,0.08) 0%,
        transparent 40%
    );
    z-index: 1; pointer-events: none;
}
.product-card:hover .app-icon-placeholder {
    transform: scale(1.08);
    box-shadow: 0 12px 36px rgba(0,0,0,0.4), 0 0 20px rgba(64,212,160,0.1), 0 0 0 1px rgba(255,255,255,0.12);
}
.product-card h3 {
    font-size: 16px; font-weight: 700; margin-bottom: 6px;
    line-height: 1.4; color: var(--text-1); position: relative; z-index: 1;
}
.product-card p {
    font-size: 13px; color: var(--text-3); line-height: 1.7;
    margin-bottom: 20px; position: relative; z-index: 1;
}
.download-btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 28px 10px 22px; border-radius: 50px;
    background: linear-gradient(135deg, rgba(64,212,160,0.12), rgba(80,180,220,0.06));
    border: 1px solid rgba(64,212,160,0.25);
    color: rgba(255,255,255,0.88); font-size: 13px; font-weight: 600;
    letter-spacing: 0.02em;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative; z-index: 1; overflow: hidden;
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 12px rgba(64,212,160,0.06), inset 0 1px 0 rgba(255,255,255,0.06);
    cursor: pointer;
}
.download-btn::before {
    content: "";
    display: inline-block; width: 16px; height: 16px; flex-shrink: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='rgba(255,255,255,0.85)' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='7 10 12 15 17 10'/%3E%3Cline x1='12' y1='15' x2='12' y2='3'/%3E%3C/svg%3E");
    background-size: contain; background-repeat: no-repeat;
    transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.download-btn::after {
    content: "";
    position: absolute; top: 0; left: -100%; width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.08), transparent);
    transition: left 0.5s ease;
}
.download-btn:hover {
    background: linear-gradient(135deg, rgba(64,212,160,0.85), rgba(50,200,180,0.9));
    color: #000; font-weight: 700;
    border-color: rgba(64,212,160,0.6);
    box-shadow: 0 6px 28px rgba(64,212,160,0.25), 0 0 0 1px rgba(64,212,160,0.15), inset 0 1px 0 rgba(255,255,255,0.2);
    transform: translateY(-2px);
}
.download-btn:hover::before {
    transform: translateY(2px);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='rgba(0,0,0,0.8)' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'/%3E%3Cpolyline points='7 10 12 15 17 10'/%3E%3Cline x1='12' y1='15' x2='12' y2='3'/%3E%3C/svg%3E");
}
.download-btn:hover::after {
    left: 100%;
}
.download-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 12px rgba(64,212,160,0.2);
}
.download-btn:visited {
    color: rgba(255,255,255,0.88);
}

/* ============================================================
   关于我们
   ============================================================ */
.about {
    padding: 120px 0 140px;
    position: relative; overflow: hidden;
    background: var(--bg);
}
.about::before {
    content: ""; position: absolute;
    top: -100px; left: 0; right: 0; height: 500px;
    background: linear-gradient(180deg, var(--bg-surface) 0%, var(--bg-surface) 15%, var(--bg) 100%);
    pointer-events: none;
}
.about::after {
    content: ""; position: absolute;
    bottom: 10%; left: 50%; transform: translateX(-50%);
    width: 600px; height: 600px;
    background:
        radial-gradient(ellipse at 40% 50%, rgba(64,212,160,0.03) 0%, transparent 60%),
        radial-gradient(ellipse at 60% 50%, rgba(120,140,255,0.02) 0%, transparent 60%);
    border-radius: 50%; pointer-events: none;
}
.about-text {
    text-align: center; max-width: 580px; margin: 0 auto 72px;
    font-size: 17px; color: var(--text-2); line-height: 2;
    position: relative; z-index: 1;
    letter-spacing: 0.01em;
}
.values {
    display: flex; justify-content: center; gap: 20px; flex-wrap: wrap;
    position: relative; z-index: 1;
}
.value-item {
    flex: 1; min-width: 200px; max-width: 280px;
    text-align: center;
    background: rgba(255,255,255,0.04);
    backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
    border: 1px solid transparent;
    background-clip: padding-box;
    border-radius: 24px;
    padding: 40px 28px;
    position: relative; overflow: hidden;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
/* 渐变边框 */
.value-item::before {
    content: "";
    position: absolute; inset: 0;
    border-radius: 24px;
    padding: 1px;
    background: linear-gradient(
        160deg,
        rgba(255,255,255,0.15) 0%,
        rgba(120,230,200,0.1) 40%,
        rgba(255,255,255,0.04) 60%,
        rgba(160,140,255,0.08) 100%
    );
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask-composite: exclude;
    pointer-events: none;
}
/* 顶部高光 */
.value-item::after {
    content: "";
    position: absolute; top: 0; left: 0; right: 0; height: 40%;
    background: linear-gradient(180deg, rgba(255,255,255,0.06) 0%, transparent 100%);
    border-radius: 24px 24px 0 0;
    pointer-events: none;
}
.value-item:hover {
    transform: translateY(-6px);
    background: rgba(255,255,255,0.07);
    box-shadow: 0 20px 56px rgba(0,0,0,0.25), 0 0 40px rgba(64,212,160,0.05);
}
.value-item:hover::before {
    background: linear-gradient(
        160deg,
        rgba(255,255,255,0.3) 0%,
        rgba(120,230,200,0.2) 40%,
        rgba(255,255,255,0.08) 60%,
        rgba(160,140,255,0.15) 100%
    );
}
.value-icon {
    display: block; margin-bottom: 16px;
    color: var(--accent-light);
    position: relative; z-index: 1;
}
.value-icon svg {
    display: block; margin: 0 auto;
}
.value-title {
    display: block; font-size: 18px; font-weight: 700;
    color: var(--text-1); margin-bottom: 10px;
    letter-spacing: 0.02em;
    position: relative; z-index: 1;
}
.value-desc {
    display: block; font-size: 13px; color: var(--text-3);
    line-height: 1.7; letter-spacing: 0.01em;
    position: relative; z-index: 1;
}

/* ============================================================
   页脚 — 无缝融合
   ============================================================ */
.footer {
    padding: 48px 0 24px;
    background: var(--bg);
    color: var(--text-3);
}
.footer::before {
    content: ""; display: block;
    height: 1px; margin-bottom: 48px;
    background: linear-gradient(90deg, transparent 5%, rgba(64,212,160,0.1) 30%, rgba(120,140,255,0.08) 70%, transparent 95%);
}
.footer-content { text-align: center; margin-bottom: 32px; }
.footer h3 {
    font-size: 16px; color: var(--text-2);
    margin-bottom: 10px; font-weight: 600;
    letter-spacing: 0.02em;
}
.footer p { font-size: 14px; color: var(--text-3); }
.footer-bottom {
    text-align: center; padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.04);
    font-size: 12px; color: var(--text-3);
}
.footer-link {
    color: var(--text-2); transition: color 0.3s; font-size: 12px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 1px;
}
.footer-link:hover { color: var(--accent-light); border-bottom-color: var(--accent-light); }
.icp { margin-top: 8px; opacity: 0.5; }

/* ============================================================
   回到顶部
   ============================================================ */
.back-to-top {
    position: fixed; bottom: 32px; right: 32px; z-index: 99;
    width: 44px; height: 44px; border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.08);
    background: rgba(12,12,22,0.6);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    color: var(--text-2); font-size: 18px;
    cursor: pointer;
    opacity: 0; visibility: hidden;
    transform: translateY(12px);
    transition: opacity 0.3s, visibility 0.3s, transform 0.3s, background 0.3s, color 0.3s;
}
.back-to-top.visible {
    opacity: 1; visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    background: rgba(64,212,160,0.15);
    color: var(--accent-light);
    border-color: rgba(64,212,160,0.2);
}

/* ============================================================
   英文适配
   ============================================================ */
html[lang="en"] .hero-title { font-size: clamp(26px, 5vw + 6px, 60px); }
html[lang="en"] .hero p { white-space: normal; }
html[lang="en"] .section-title { font-size: 34px; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .products-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .navbar { top: 10px; width: calc(100% - 32px); height: 50px; }
    .nav-container { padding: 0 20px; }
    .hero {
        padding: 0 20px; min-height: 100vh; min-height: 100dvh;
        display: flex; align-items: stretch; justify-content: center;
    }
    .hero-content {
        padding: 0 20px; border-radius: 28px;
        display: flex; flex-direction: column; align-items: center; justify-content: center;
        width: 100%; gap: 0;
        background: radial-gradient(ellipse at center, rgba(3,10,6,0.6) 0%, rgba(3,10,6,0.2) 50%, transparent 100%);
    }
    .hero-title {
        font-size: clamp(32px, 5.5vw + 4px, 44px); margin-top: 80px; margin-bottom: 20px;
        text-shadow: 0 0 24px rgba(0,0,0,0.6), 0 0 48px rgba(80,220,160,0.08);
    }
    .hero p { font-size: 14px; margin-bottom: 0; white-space: normal; }
    .cta-button {
        padding: 14px 36px; font-size: 15px;
        position: absolute; bottom: 60px; left: 20px; right: 20px;
        width: auto; text-align: center; transform: none;
    }
    .products, .about { padding: 80px 0; }
    .products-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .section-title { font-size: 26px; }
    .section-subtitle { margin-bottom: 40px; font-size: 14px; }
    .about-text { font-size: 15px; line-height: 1.8; margin-bottom: 48px; }
    .values { gap: 14px; }
    .value-item { padding: 28px 20px; border-radius: 20px; }
    .value-icon { margin-bottom: 12px; }
    .value-icon svg { width: 24px; height: 24px; }
    .value-title { font-size: 16px; }
    .value-desc { font-size: 12px; }
    .nav-links { display: none; }
    .nav-menu-btn { display: block; }
    .footer h3 { font-size: 15px; }
    .footer p { font-size: 13px; }
    .footer-bottom { font-size: 11px; }

    .nav-links.active {
        display: flex; flex-direction: column;
        position: absolute; top: 60px; left: 0; right: 0;
        background: rgba(12,12,22,0.9);
        backdrop-filter: blur(28px) saturate(150%);
        -webkit-backdrop-filter: blur(28px) saturate(150%);
        padding: 12px 0; border-radius: 20px;
        border: 1px solid rgba(255,255,255,0.06);
        box-shadow: 0 12px 40px rgba(0,0,0,0.3);
    }
    .nav-links.active a { display: block; padding: 12px 24px; font-size: 15px; }

    /* 768px 中文适配 */
    html[lang="zh-CN"] .hero-title { font-size: clamp(34px, 5.5vw + 4px, 44px); letter-spacing: 0.02em; }
    html[lang="zh-CN"] .hero p { font-size: 15px; letter-spacing: 0.08em; }
    html[lang="zh-CN"] .cta-button { font-size: 16px; letter-spacing: 0.05em; }
    html[lang="zh-CN"] .section-title { font-size: 28px; }

    /* 768px 英文适配 */
    html[lang="en"] .hero-title { font-size: clamp(26px, 4.5vw + 4px, 36px); letter-spacing: -0.02em; line-height: 1.2; }
    html[lang="en"] .hero p { font-size: 13px; letter-spacing: 0.02em; }
    html[lang="en"] .cta-button { font-size: 14px; letter-spacing: 0.03em; }
    html[lang="en"] .section-title { font-size: 24px; }
    html[lang="en"] .section-subtitle { font-size: 13px; }
    html[lang="en"] .about-text { font-size: 14px; }
    html[lang="en"] .value-desc { font-size: 11px; }
}
@media (max-width: 480px) {
    .hero { padding: 0 16px; }
    .hero-content {
        padding: 0 16px;
        background: radial-gradient(ellipse at center, rgba(3,10,6,0.65) 0%, rgba(3,10,6,0.25) 45%, transparent 100%);
    }
    .hero-title {
        font-size: clamp(28px, 7vw, 36px); letter-spacing: -0.02em; margin-bottom: 16px;
        text-shadow: 0 0 20px rgba(0,0,0,0.7), 0 0 40px rgba(80,220,160,0.06);
    }
    .hero p { font-size: 13px; line-height: 1.8; }
    .cta-button { padding: 14px 0; font-size: 14px; left: 16px; right: 16px; bottom: 48px; width: auto; }
    .products, .about { padding: 60px 0; }
    .products-grid { grid-template-columns: 1fr; gap: 12px; }
    .product-card { padding: 24px 20px 22px; border-radius: 22px; }
    .product-card .card-bg-icon { clip-path: inset(0 round 22px); }
    .product-card .app-icon-wrap,
    .product-card .app-icon-placeholder { width: 56px; height: 56px; border-radius: 14px; }
    .section-title { font-size: 24px; }
    .section-subtitle { font-size: 13px; margin-bottom: 32px; }
    .about-text { font-size: 14px; padding: 0 4px; }
    .values { flex-direction: column; align-items: center; gap: 12px; }
    .value-item { max-width: 100%; width: 100%; padding: 24px 20px; border-radius: 18px; }
    .value-icon { margin-bottom: 10px; }
    .value-icon svg { width: 22px; height: 22px; }
    .footer { padding: 40px 0 20px; }

    /* 480px 中文适配 */
    html[lang="zh-CN"] .hero-title { font-size: clamp(30px, 7.5vw, 38px); letter-spacing: 0.02em; }
    html[lang="zh-CN"] .hero p { font-size: 14px; letter-spacing: 0.06em; }
    html[lang="zh-CN"] .cta-button { font-size: 15px; }
    html[lang="zh-CN"] .section-title { font-size: 26px; }

    /* 480px 英文适配 */
    html[lang="en"] .hero-title { font-size: clamp(24px, 6vw, 30px); letter-spacing: -0.02em; line-height: 1.2; }
    html[lang="en"] .hero p { font-size: 12px; letter-spacing: 0.01em; }
    html[lang="en"] .cta-button { font-size: 13px; }
    html[lang="en"] .section-title { font-size: 20px; }
    html[lang="en"] .section-subtitle { font-size: 12px; }
    html[lang="en"] .about-text { font-size: 13px; }
    html[lang="en"] .value-desc { font-size: 10px; }
}