/**
 * 视彩树影视APP下载系统 - 前台样式（高端重构版）
 *
 * 设计语言：电影感暗色高级质感 · 紫罗兰→电光蓝渐变 · 香槟金点缀
 * 细节：噪点颗粒、极光光晕、玻璃拟态、渐变描边、滚动显现、微光悬停
 * 支持：深浅主题切换 · 全设备响应式
 *
 * 目录：
 * 1. 设计变量与全局重置
 * 2. 通用工具（容器/分节/标题）
 * 3. 顶部导航（毛玻璃 + 渐变Logo）
 * 4. Hero 区（极光背景 + 电影感主视觉 + 悬浮数据卡）
 * 5. 滚动字幕条
 * 6. 产品特色（渐变图标卡片）
 * 7. 下载中心（平台专属配色卡片）
 * 8. 应用展示（设备样机框架 + 灯箱）
 * 9. 官方公告（时间轴式列表）
 * 10. CTA 号召区
 * 11. 页脚
 * 12. Toast / 返回顶部
 * 13. 动画关键帧
 * 14. 响应式适配
 */

/* ==================== 1. 设计变量与全局重置 ==================== */
:root {
    /* 色板 */
    --violet: #7c5cff;
    --violet-deep: #5b3df5;
    --blue: #4cc9f0;
    --cyan: #38e0e0;
    --gold: #f5c04a;
    --orange: #ff8a5c;
    --green: #2dd4a7;
    --red: #ff6b81;
    --pink: #f472b6;
    /* 语义色 */
    --accent: #7c5cff;
    --accent-light: #a89bff;
    --success: var(--green);
    --danger: var(--red);
    --warning: var(--gold);
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #7c5cff 0%, #4cc9f0 100%);
    --gradient-gold: linear-gradient(135deg, #f5c04a 0%, #ff8a5c 100%);
    --gradient-text: linear-gradient(120deg, #ffffff 0%, #c9b8ff 45%, #7ee4ff 100%);
    --gradient-border: linear-gradient(135deg, rgba(124, 92, 255, 0.55), rgba(76, 201, 240, 0.35), rgba(255, 255, 255, 0.06));
    /* 背景 */
    --bg: #070a14;
    --bg-soft: #0b0f1e;
    --bg-deep: #05070f;
    --surface: rgba(255, 255, 255, 0.035);
    --surface-hover: rgba(255, 255, 255, 0.07);
    --surface-strong: rgba(255, 255, 255, 0.06);
    --border: rgba(255, 255, 255, 0.09);
    --border-strong: rgba(255, 255, 255, 0.16);
    /* 文字 */
    --text: #f4f5fb;
    --text-2: rgba(244, 245, 251, 0.72);
    --text-3: rgba(244, 245, 251, 0.44);
    /* 尺寸 */
    --radius: 16px;
    --radius-lg: 24px;
    --radius-sm: 10px;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
    --shadow-sm: 0 10px 30px rgba(0, 0, 0, 0.28);
    --shadow-accent: 0 16px 44px rgba(124, 92, 255, 0.28);
    --nav-h: 68px;
    /* 字体 */
    --font: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', -apple-system, sans-serif;
    /* 动效 */
    --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
    --fast: 0.24s;
    --mid: 0.45s;
    /* 组件变量（主题内再覆盖） */
    --navbar-bg: rgba(7, 10, 20, 0.72);
    --input-bg: rgba(255, 255, 255, 0.05);
    --input-border: rgba(255, 255, 255, 0.12);
    --phone-bg: linear-gradient(160deg, #131a30 0%, #1d1440 55%, #0c1224 100%);
    --footer-bg: #05070f;
    --grain-opacity: 0.05;
}
/* 浅色主题 */
body[data-theme="light"] {
    --bg: #f4f5fa;
    --bg-soft: #ffffff;
    --bg-deep: #eceef6;
    --surface: rgba(17, 20, 45, 0.03);
    --surface-hover: rgba(17, 20, 45, 0.055);
    --surface-strong: rgba(17, 20, 45, 0.05);
    --border: rgba(17, 20, 45, 0.09);
    --border-strong: rgba(17, 20, 45, 0.18);
    --text: #14162b;
    --text-2: rgba(20, 22, 43, 0.72);
    --text-3: rgba(20, 22, 43, 0.46);
    --gradient-text: linear-gradient(120deg, #14162b 0%, #6a4cff 55%, #0e9fd8 100%);
    --gradient-border: linear-gradient(135deg, rgba(124, 92, 255, 0.45), rgba(76, 201, 240, 0.3), rgba(17, 20, 45, 0.06));
    --shadow: 0 24px 60px rgba(26, 30, 70, 0.12);
    --shadow-sm: 0 10px 30px rgba(26, 30, 70, 0.08);
    --shadow-accent: 0 16px 44px rgba(124, 92, 255, 0.18);
    --navbar-bg: rgba(255, 255, 255, 0.78);
    --input-bg: rgba(17, 20, 45, 0.03);
    --input-border: rgba(17, 20, 45, 0.12);
    --footer-bg: #10132a;
    --grain-opacity: 0.04;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    transition: background var(--mid) ease, color var(--mid) ease;
}
body::selection { background: rgba(124, 92, 255, 0.35); color: #fff; }
a { color: inherit; }
img { max-width: 100%; display: block; }
button { font-family: var(--font); }

/* ==================== 2. 通用工具 ==================== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 96px 0; position: relative; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    color: var(--violet);
    padding: 7px 18px;
    border-radius: 100px;
    background: color-mix(in srgb, var(--violet) 10%, transparent);
    border: 1px solid color-mix(in srgb, var(--violet) 22%, transparent);
    margin-bottom: 18px;
}
body[data-theme="light"] .section-eyebrow { color: #6a4cff; }
.section-eyebrow::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 10px rgba(124, 92, 255, 0.8);
}
.section-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 800;
    letter-spacing: 1px;
    line-height: 1.25;
    margin-bottom: 14px;
}
.section-title em {
    font-style: normal;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.section-subtitle { font-size: 15px; color: var(--text-3); }

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 9px;
    padding: 13px 28px;
    border-radius: 14px;
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-decoration: none;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
    transition: transform var(--fast) var(--ease), box-shadow var(--fast) var(--ease), background var(--fast) var(--ease), border-color var(--fast) var(--ease);
    white-space: nowrap;
}
.btn svg { width: 16px; height: 16px; flex-shrink: 0; }
.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 10px 28px rgba(124, 92, 255, 0.34);
}
.btn-primary::after {
    content: '';
    position: absolute;
    top: 0; left: -80%;
    width: 50%; height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.28), transparent);
    transform: skewX(-20deg);
    transition: left 0.6s var(--ease);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 40px rgba(124, 92, 255, 0.45); }
.btn-primary:hover::after { left: 130%; }
.btn-ghost {
    background: var(--surface);
    border: 1px solid var(--border-strong);
    color: var(--text);
    backdrop-filter: blur(12px);
}
.btn-ghost:hover { background: var(--surface-hover); transform: translateY(-2px); border-color: color-mix(in srgb, var(--violet) 45%, transparent); }
.btn-lg { padding: 16px 38px; font-size: 15px; border-radius: 16px; }
.btn-gold {
    background: var(--gradient-gold);
    color: #1c1405;
    box-shadow: 0 10px 30px rgba(245, 192, 74, 0.35);
}
.btn-gold:hover { transform: translateY(-2px); box-shadow: 0 16px 42px rgba(245, 192, 74, 0.45); }

/* ==================== 3. 顶部导航 ==================== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: var(--navbar-bg);
    backdrop-filter: blur(22px) saturate(150%);
    -webkit-backdrop-filter: blur(22px) saturate(150%);
    border-bottom: 1px solid transparent;
    transition: background var(--mid) var(--ease), border-color var(--mid) var(--ease), box-shadow var(--mid) var(--ease);
}
.navbar.scrolled {
    border-bottom-color: var(--border);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
}
body[data-theme="light"] .navbar.scrolled { box-shadow: 0 12px 40px rgba(26, 30, 70, 0.1); }
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-h);
    gap: 24px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-logo {
    width: 52px; height: 52px;
    border-radius: 14px;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    box-shadow: 0 6px 18px rgba(124, 92, 255, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    position: relative;
}
.brand-logo svg { width: 26px; height: 26px; }
.brand-logo-img { width: 100%; height: 100%; object-fit: contain; border-radius: inherit; display: block; }
.footer-brand .brand-logo-img { padding: 4px; }
.brand-name {
    font-size: 19px;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.brand-badge {
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 1px;
    color: var(--violet);
    background: color-mix(in srgb, var(--violet) 12%, transparent);
    border: 1px solid color-mix(in srgb, var(--violet) 28%, transparent);
    padding: 3px 10px;
    border-radius: 100px;
    white-space: nowrap;
}
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-link {
    color: var(--text-2);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 14px;
    border-radius: 100px;
    transition: color var(--fast) var(--ease), background var(--fast) var(--ease);
    position: relative;
}
.nav-link:hover { color: var(--text); background: var(--surface); }
.nav-actions { display: flex; align-items: center; gap: 10px; }
.theme-toggle {
    width: 38px; height: 38px;
    border-radius: 12px;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    color: var(--text);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: transform var(--fast) var(--ease), box-shadow var(--fast) var(--ease), background var(--fast) var(--ease);
}
.theme-toggle:hover { transform: translateY(-1px) scale(1.04); box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2); }
.theme-toggle svg { width: 17px; height: 17px; }
.theme-toggle .icon-moon { display: block; }
.theme-toggle .icon-sun { display: none; }
body[data-theme="light"] .theme-toggle .icon-moon { display: none; }
body[data-theme="light"] .theme-toggle .icon-sun { display: block; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.nav-toggle span {
    width: 22px; height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: transform var(--fast) var(--ease), opacity var(--fast) var(--ease);
}
.nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ==================== 4. Hero 区 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--nav-h);
    overflow: hidden;
    background: radial-gradient(120% 90% at 75% 0%, #131a33 0%, #0a0e1e 45%, var(--bg) 100%);
}
body[data-theme="light"] .hero { background: radial-gradient(120% 90% at 75% 0%, #eef0ff 0%, #e7e9fb 45%, var(--bg) 100%); }
.hero-bg { position: absolute; inset: 0; pointer-events: none; z-index: 0; }
/* 极光光晕 */
.aurora { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5; animation: auroraFloat 14s ease-in-out infinite; }
.aurora-1 { width: 560px; height: 560px; background: radial-gradient(circle, rgba(124, 92, 255, 0.5), transparent 65%); top: -160px; left: -120px; }
.aurora-2 { width: 460px; height: 460px; background: radial-gradient(circle, rgba(76, 201, 240, 0.38), transparent 65%); bottom: -140px; right: -80px; animation-delay: -5s; }
.aurora-3 { width: 320px; height: 320px; background: radial-gradient(circle, rgba(245, 192, 74, 0.22), transparent 65%); top: 42%; left: 46%; animation-delay: -9s; }
body[data-theme="light"] .aurora { opacity: 0.55; }
body[data-theme="light"] .aurora-1 { background: radial-gradient(circle, rgba(124, 92, 255, 0.22), transparent 65%); }
body[data-theme="light"] .aurora-2 { background: radial-gradient(circle, rgba(76, 201, 240, 0.2), transparent 65%); }
/* 网格 */
.grid-overlay {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: radial-gradient(85% 70% at 50% 35%, #000 40%, transparent 100%);
    mask-image: radial-gradient(85% 70% at 50% 35%, #000 40%, transparent 100%);
}
body[data-theme="light"] .grid-overlay {
    background-image:
        linear-gradient(rgba(20, 22, 43, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(20, 22, 43, 0.05) 1px, transparent 1px);
}
/* 噪点颗粒 */
.grain::after {
    content: '';
    position: absolute; inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
    opacity: var(--grain-opacity);
    pointer-events: none;
    z-index: 1;
}
/* 底部渐隐 */
.hero::before {
    content: '';
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 160px;
    background: linear-gradient(to top, var(--bg), transparent);
    z-index: 1;
    pointer-events: none;
}
.hero-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.08fr 0.92fr;
    gap: 64px;
    align-items: center;
    padding: 72px 24px 96px;
}
/* 左侧内容 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    background: var(--surface);
    border: 1px solid var(--border-strong);
    backdrop-filter: blur(14px);
    padding: 7px 16px;
    border-radius: 100px;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-2);
    margin-bottom: 26px;
    box-shadow: var(--shadow-sm);
}
.pulse-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--green);
    position: relative;
    flex-shrink: 0;
}
.pulse-dot::after {
    content: '';
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    background: var(--green);
    opacity: 0.45;
    animation: pulse 2.2s ease-in-out infinite;
}
.hero-badge .ver { color: var(--gold); font-weight: 700; }
.hero-title {
    font-size: clamp(38px, 5.6vw, 60px);
    font-weight: 900;
    line-height: 1.14;
    letter-spacing: 1px;
    margin-bottom: 18px;
}
.hero-title-gradient {
    display: block;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: none;
}
.hero-desc {
    font-size: 16px;
    color: var(--text-2);
    max-width: 520px;
    line-height: 1.9;
    margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 14px; margin-bottom: 46px; flex-wrap: wrap; }
.hero-stats { display: flex; align-items: center; gap: 0; }
.stat {
    padding: 0 32px;
    position: relative;
}
.stat:first-child { padding-left: 0; }
.stat:not(:first-child)::before {
    content: '';
    position: absolute;
    left: 0; top: 50%;
    transform: translateY(-50%);
    width: 1px; height: 44px;
    background: linear-gradient(to bottom, transparent, var(--border-strong), transparent);
}
.stat-num {
    font-size: 32px;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    font-variant-numeric: tabular-nums;
}
.stat-label { font-size: 12.5px; color: var(--text-3); margin-top: 2px; letter-spacing: 1px; }
/* 右侧主视觉 */
.hero-visual { display: flex; justify-content: center; align-items: center; position: relative; }
.phone-mockup {
    position: relative;
    width: 252px;
    height: 520px;
    border-radius: 42px;
    background: linear-gradient(160deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.04) 40%);
    border: 1px solid var(--border-strong);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.22);
    padding: 11px;
    animation: floatPhone 7s ease-in-out infinite;
}
body[data-theme="light"] .phone-mockup { box-shadow: 0 40px 90px rgba(26, 30, 70, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.6); }
.phone-screen {
    width: 100%; height: 100%;
    border-radius: 32px;
    background: var(--phone-bg);
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
}
.phone-screen-img {
    position: absolute; inset: 0;
    width: 100%; height: 100%;
    object-fit: cover;
    z-index: 1;
}
.phone-screen::before {
    content: '';
    position: absolute; inset: 0;
    background: radial-gradient(120% 60% at 50% 0%, rgba(124, 92, 255, 0.35), transparent 60%);
    z-index: 2;
    pointer-events: none;
}
.phone-notch {
    position: absolute;
    top: 12px; left: 50%;
    transform: translateX(-50%);
    width: 92px; height: 22px;
    background: rgba(4, 6, 14, 0.85);
    border-radius: 20px;
    z-index: 3;
}
.phone-app { position: relative; z-index: 2; text-align: center; padding: 20px; }
.phone-app-icon {
    width: 72px; height: 72px;
    margin: 0 auto 14px;
    border-radius: 20px;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    box-shadow: 0 14px 36px rgba(124, 92, 255, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.35);
}
.phone-app-icon svg { width: 32px; height: 32px; }
.phone-app-name { font-size: 17px; font-weight: 800; color: #fff; letter-spacing: 1px; }
.phone-app-tag { font-size: 11.5px; color: rgba(255, 255, 255, 0.55); letter-spacing: 0.5px; }
.phone-lines { width: 74%; display: flex; flex-direction: column; gap: 9px; position: relative; z-index: 2; }
.phone-line { height: 7px; background: rgba(255, 255, 255, 0.12); border-radius: 6px; }
.phone-line.short { width: 58%; }
.phone-line.accent { width: 72%; background: linear-gradient(90deg, rgba(124, 92, 255, 0.7), rgba(76, 201, 240, 0.5)); }
.phone-glow {
    position: absolute;
    bottom: -120px; left: 50%;
    transform: translateX(-50%);
    width: 380px; height: 240px;
    background: radial-gradient(circle, rgba(124, 92, 255, 0.45), transparent 70%);
    filter: blur(40px);
    z-index: 0;
}
/* 悬浮数据卡 */
.float-chip {
    position: absolute;
    z-index: 3;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: 16px;
    background: color-mix(in srgb, var(--bg-soft) 72%, transparent);
    border: 1px solid var(--border-strong);
    backdrop-filter: blur(18px);
    box-shadow: var(--shadow-sm);
    animation: chipFloat 6s ease-in-out infinite;
}
.float-chip .chip-icon {
    width: 34px; height: 34px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    flex-shrink: 0;
}
.float-chip .chip-icon svg { width: 16px; height: 16px; }
.float-chip .chip-val { font-size: 15px; font-weight: 800; line-height: 1.1; }
.float-chip .chip-lbl { font-size: 10.5px; color: var(--text-3); letter-spacing: 0.5px; }
.chip-1 { top: 52px; left: -30px; animation-delay: -1.5s; }
.chip-1 .chip-icon { background: var(--gradient-gold); }
.chip-2 { bottom: 96px; right: -38px; animation-delay: -3.5s; }
.chip-2 .chip-icon { background: var(--gradient-primary); }
.chip-3 { bottom: 10px; left: -14px; animation-delay: -5s; }
.chip-3 .chip-icon { background: linear-gradient(135deg, #2dd4a7, #38e0e0); }
/* 滚动指示 */
.scroll-hint {
    position: absolute;
    bottom: 26px; left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: var(--text-3);
    font-size: 11px;
    letter-spacing: 3px;
    text-decoration: none;
    transition: color var(--fast) var(--ease);
}
.scroll-hint:hover { color: var(--text-2); }
.scroll-hint .mouse {
    width: 24px; height: 38px;
    border: 2px solid var(--text-3);
    border-radius: 14px;
    position: relative;
}
.scroll-hint .mouse::after {
    content: '';
    position: absolute;
    top: 6px; left: 50%;
    transform: translateX(-50%);
    width: 3px; height: 8px;
    border-radius: 2px;
    background: var(--violet);
    animation: wheel 2s ease-in-out infinite;
}

/* ==================== 5. 滚动字幕条 ==================== */
.ticker {
    position: relative;
    background: var(--bg-soft);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    overflow: hidden;
    padding: 18px 0;
    z-index: 2;
}
.ticker-track {
    display: flex;
    gap: 56px;
    width: max-content;
    animation: tickerMove 30s linear infinite;
}
.ticker:hover .ticker-track { animation-play-state: paused; }
.ticker-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13.5px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--text-3);
    white-space: nowrap;
}
.ticker-item svg { width: 15px; height: 15px; color: var(--violet); }

/* ==================== 6. 产品特色 ==================== */
.features { background: var(--bg); }
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
.feature-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 30px 26px;
    overflow: hidden;
    transition: transform var(--mid) var(--ease), box-shadow var(--mid) var(--ease), border-color var(--mid) var(--ease);
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--mid) var(--ease);
}
.feature-card::after {
    content: '';
    position: absolute;
    top: -60%; right: -40%;
    width: 220px; height: 220px;
    border-radius: 50%;
    background: radial-gradient(circle, color-mix(in srgb, var(--fc) 16%, transparent), transparent 70%);
    opacity: 0;
    transition: opacity var(--mid) var(--ease);
}
.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-sm);
    border-color: color-mix(in srgb, var(--fc) 38%, transparent);
}
.feature-card:hover::before { opacity: 1; }
.feature-card:hover::after { opacity: 1; }
.feature-icon {
    width: 52px; height: 52px;
    border-radius: 15px;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    margin-bottom: 20px;
    background: linear-gradient(140deg, var(--fc), color-mix(in srgb, var(--fc) 45%, #000));
    box-shadow: 0 10px 26px color-mix(in srgb, var(--fc) 34%, transparent);
    position: relative;
    z-index: 1;
}
.feature-icon svg { width: 23px; height: 23px; }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 9px; position: relative; z-index: 1; }
.feature-card p { font-size: 13.5px; color: var(--text-3); line-height: 1.75; position: relative; z-index: 1; }

/* ==================== 7. 下载中心 ==================== */
.download {
    background: var(--bg-soft);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 22px;
}
.download-card {
    position: relative;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px 26px 26px;
    text-align: center;
    overflow: hidden;
    transition: transform var(--mid) var(--ease), box-shadow var(--mid) var(--ease), border-color var(--mid) var(--ease);
}
.download-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--pc);
    opacity: 0.9;
}
.download-card::after {
    content: '';
    position: absolute;
    top: -70px; left: 50%;
    transform: translateX(-50%);
    width: 240px; height: 240px;
    border-radius: 50%;
    background: radial-gradient(circle, color-mix(in srgb, var(--pc) 15%, transparent), transparent 70%);
    pointer-events: none;
}
.download-card:hover {
    transform: translateY(-7px);
    box-shadow: 0 22px 50px color-mix(in srgb, var(--pc) 14%, rgba(0, 0, 0, 0.4));
    border-color: color-mix(in srgb, var(--pc) 42%, transparent);
}
body[data-theme="light"] .download-card:hover { box-shadow: 0 22px 50px color-mix(in srgb, var(--pc) 16%, rgba(26, 30, 70, 0.14)); }
.card-icon {
    width: 60px; height: 60px;
    margin: 0 auto 18px;
    border-radius: 18px;
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    background: linear-gradient(140deg, var(--pc), color-mix(in srgb, var(--pc) 42%, #000));
    box-shadow: 0 12px 30px color-mix(in srgb, var(--pc) 38%, transparent), inset 0 1px 0 rgba(255, 255, 255, 0.28);
    position: relative;
    z-index: 1;
}
.card-icon svg { width: 27px; height: 27px; }
.card-icon .platform-emoji { font-size: 28px; line-height: 1; }
.card-platform { font-size: 17px; font-weight: 700; margin-bottom: 8px; position: relative; z-index: 1; }
.card-meta { display: flex; justify-content: center; gap: 8px; margin-bottom: 14px; position: relative; z-index: 1; }
.version-tag, .size-tag {
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 11.5px;
    font-weight: 600;
}
.version-tag {
    background: color-mix(in srgb, var(--pc) 16%, transparent);
    color: color-mix(in srgb, var(--pc) 62%, #fff);
    border: 1px solid color-mix(in srgb, var(--pc) 30%, transparent);
}
.size-tag {
    background: var(--surface-strong);
    color: var(--text-2);
    border: 1px solid var(--border);
}
.card-desc {
    font-size: 13px;
    color: var(--text-3);
    line-height: 1.7;
    min-height: 44px;
    margin-bottom: 16px;
    position: relative; z-index: 1;
}
.card-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 7px;
    margin-bottom: 22px;
    position: relative; z-index: 1;
}
.feature-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 11px;
    font-weight: 500;
    color: var(--text-2);
}
.feature-tag svg { width: 9px; height: 9px; color: var(--green); }
.btn-download {
    width: 100%;
    justify-content: center;
    background: linear-gradient(140deg, var(--pc), color-mix(in srgb, var(--pc) 55%, #000));
    color: #fff;
    box-shadow: 0 10px 26px color-mix(in srgb, var(--pc) 32%, transparent);
}
.btn-download:hover { transform: translateY(-2px); box-shadow: 0 14px 34px color-mix(in srgb, var(--pc) 42%, transparent); }
.download-note {
    text-align: center;
    margin-top: 34px;
    font-size: 12.5px;
    color: var(--text-3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}
.download-note svg { width: 14px; height: 14px; color: var(--green); }

/* ==================== 8. 应用展示 ==================== */
.showcase { background: var(--bg); }
.showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
}
.showcase-item { cursor: pointer; }
.showcase-img-wrap {
    position: relative;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: transform var(--mid) var(--ease), box-shadow var(--mid) var(--ease), border-color var(--mid) var(--ease);
}
.showcase-item:hover .showcase-img-wrap {
    transform: translateY(-5px);
    box-shadow: var(--shadow-sm);
    border-color: color-mix(in srgb, var(--violet) 40%, transparent);
}
.showcase-img-wrap img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.7s var(--ease);
}
.showcase-item:hover .showcase-img-wrap img { transform: scale(1.06); }
.showcase-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(to top, rgba(4, 6, 14, 0.72), transparent 55%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--mid) var(--ease);
}
.showcase-item:hover .showcase-overlay { opacity: 1; }
.showcase-play {
    width: 52px; height: 52px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex; align-items: center; justify-content: center;
    color: #fff;
    box-shadow: 0 12px 34px rgba(124, 92, 255, 0.5);
    transform: scale(0.75);
    transition: transform var(--mid) var(--ease);
}
.showcase-item:hover .showcase-play { transform: scale(1); }
.showcase-play svg { width: 20px; height: 20px; }
.showcase-caption {
    padding: 12px 6px 0;
    font-size: 13.5px;
    font-weight: 600;
    color: var(--text-2);
    text-align: center;
    letter-spacing: 0.5px;
}
/* 设备样机框架 */
.showcase-img-wrap.frame-mobile {
    aspect-ratio: 9 / 16;
    max-width: 230px;
    margin: 0 auto;
    border-radius: 26px;
    border: 6px solid var(--bg-deep);
    outline: 1px solid var(--border-strong);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
}
body[data-theme="light"] .showcase-img-wrap.frame-mobile { border: 6px solid #fff; }
.showcase-img-wrap.frame-mobile img { border-radius: 20px; }
.showcase-img-wrap.frame-tablet {
    aspect-ratio: 4 / 3;
    border-radius: 18px;
}
.showcase-img-wrap.frame-tv {
    aspect-ratio: 16 / 9;
    border-radius: 14px;
    border: 8px solid var(--bg-deep);
    outline: 1px solid var(--border-strong);
}
body[data-theme="light"] .showcase-img-wrap.frame-tv { border: 8px solid #fff; }
.showcase-img-wrap.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    color: var(--text-3);
    font-size: 14px;
    letter-spacing: 1px;
}
.showcase-img-wrap.placeholder svg { width: 38px; height: 38px; }
/* 灯箱 */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 3000;
    background: rgba(3, 5, 12, 0.92);
    backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--mid) var(--ease), visibility var(--mid) var(--ease);
}
.lightbox.show { opacity: 1; visibility: visible; }
.lightbox img {
    max-width: min(900px, 90vw);
    max-height: 82vh;
    border-radius: 18px;
    box-shadow: 0 40px 120px rgba(0, 0, 0, 0.7);
    transform: scale(0.92);
    transition: transform var(--mid) var(--ease);
}
.lightbox.show img { transform: scale(1); }
.lightbox-close {
    position: absolute;
    top: 24px; right: 28px;
    width: 46px; height: 46px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.06);
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: background var(--fast) var(--ease), transform var(--fast) var(--ease);
}
.lightbox-close:hover { background: rgba(255, 255, 255, 0.16); transform: rotate(90deg); }
.lightbox-caption {
    position: absolute;
    bottom: 28px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 15px;
    letter-spacing: 1px;
}

/* ==================== 9. 官方公告 ==================== */
.announcements { background: var(--bg-soft); border-top: 1px solid var(--border); }
.announcement-list {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}
.announcement-item {
    display: flex;
    align-items: flex-start;
    gap: 18px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px 26px;
    transition: transform var(--mid) var(--ease), box-shadow var(--mid) var(--ease), border-color var(--mid) var(--ease);
}
.announcement-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-sm);
}
.announcement-item.pinned {
    border-color: color-mix(in srgb, var(--gold) 34%, transparent);
    background: linear-gradient(120deg, color-mix(in srgb, var(--gold) 6%, transparent), var(--surface) 60%);
}
.ann-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 13px;
    border-radius: 100px;
    font-size: 11px;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 2px;
    letter-spacing: 0.5px;
}
.ann-badge svg { width: 11px; height: 11px; }
.ann-badge.pinned-badge {
    background: var(--gradient-gold);
    color: #1c1405;
    box-shadow: 0 6px 18px rgba(245, 192, 74, 0.35);
}
.ann-badge.normal {
    background: color-mix(in srgb, var(--violet) 13%, transparent);
    color: var(--violet);
    border: 1px solid color-mix(in srgb, var(--violet) 26%, transparent);
}
body[data-theme="light"] .ann-badge.normal { color: #6a4cff; }
.ann-content { flex: 1; }
.ann-title { font-size: 15.5px; font-weight: 700; margin-bottom: 5px; }
.ann-text { font-size: 13px; color: var(--text-3); line-height: 1.75; }
.ann-date {
    font-size: 12px;
    color: var(--text-3);
    flex-shrink: 0;
    margin-top: 4px;
    font-variant-numeric: tabular-nums;
    background: var(--surface-strong);
    border: 1px solid var(--border);
    padding: 4px 12px;
    border-radius: 100px;
}

/* ==================== 10. CTA 号召区 ==================== */
.cta {
    position: relative;
    padding: 0;
    overflow: hidden;
}
.cta-panel {
    position: relative;
    margin: 96px auto;
    max-width: 1100px;
    padding: 76px 48px;
    border-radius: 32px;
    background:
        radial-gradient(120% 160% at 12% 0%, rgba(124, 92, 255, 0.32), transparent 55%),
        radial-gradient(120% 160% at 88% 100%, rgba(76, 201, 240, 0.28), transparent 55%),
        linear-gradient(140deg, #171a3d 0%, #0e1130 100%);
    border: 1px solid var(--border-strong);
    text-align: center;
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.45);
    overflow: hidden;
}
body[data-theme="light"] .cta-panel {
    background:
        radial-gradient(120% 160% at 12% 0%, rgba(124, 92, 255, 0.14), transparent 55%),
        radial-gradient(120% 160% at 88% 100%, rgba(76, 201, 240, 0.16), transparent 55%),
        linear-gradient(140deg, #ffffff 0%, #eef0ff 100%);
    box-shadow: 0 40px 90px rgba(26, 30, 70, 0.14);
}
.cta-panel::before {
    content: '';
    position: absolute;
    top: -140px; left: 50%;
    transform: translateX(-50%);
    width: 560px; height: 300px;
    background: radial-gradient(circle, rgba(124, 92, 255, 0.35), transparent 65%);
    filter: blur(50px);
    animation: ctaGlow 8s ease-in-out infinite;
}
.cta-panel h2 {
    position: relative;
    font-size: clamp(26px, 4vw, 38px);
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
}
.cta-panel p {
    position: relative;
    font-size: 15px;
    color: rgba(255, 255, 255, 0.62);
    margin-bottom: 34px;
}
body[data-theme="light"] .cta-panel h2 { color: #14162b; }
body[data-theme="light"] .cta-panel p { color: var(--text-2); }
.cta-panel .btn { position: relative; }

/* ==================== 11. 页脚 ==================== */
.footer {
    background: var(--footer-bg);
    padding: 64px 0 28px;
    color: rgba(255, 255, 255, 0.55);
}
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 44px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    margin-bottom: 28px;
}
.footer-brand { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-brand .brand-logo { width: 46px; height: 46px; border-radius: 12px; }
.footer-brand .brand-logo svg { width: 22px; height: 22px; }
.footer-brand .brand-name {
    font-size: 18px;
    font-weight: 800;
    color: #fff;
    background: none;
    -webkit-text-fill-color: #fff;
}
.footer-desc { font-size: 13px; line-height: 1.9; max-width: 320px; }
.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
    margin-bottom: 18px;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 11px; }
.footer-col a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: 13px;
    transition: color var(--fast) var(--ease), padding-left var(--fast) var(--ease);
}
.footer-col a:hover { color: #fff; padding-left: 4px; }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}
.footer-bottom p { font-size: 12px; color: rgba(255, 255, 255, 0.35); }
.footer-bottom a { color: rgba(255, 255, 255, 0.5); text-decoration: none; }
.footer-bottom a:hover { color: #fff; }

/* ==================== 12. Toast / 返回顶部 ==================== */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%) translateY(90px);
    background: color-mix(in srgb, var(--bg-soft) 82%, transparent);
    backdrop-filter: blur(18px);
    color: var(--text);
    padding: 13px 24px;
    border-radius: 14px;
    box-shadow: var(--shadow);
    font-size: 13.5px;
    font-weight: 500;
    z-index: 4000;
    opacity: 0;
    border: 1px solid var(--border-strong);
    display: flex;
    align-items: center;
    gap: 10px;
    transition: transform var(--mid) var(--ease), opacity var(--mid) var(--ease);
    pointer-events: none;
}
.toast svg { width: 17px; height: 17px; color: var(--green); }
.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }
.back-top {
    position: fixed;
    right: 26px;
    bottom: 30px;
    z-index: 1500;
    width: 46px; height: 46px;
    border-radius: 14px;
    border: 1px solid var(--border-strong);
    background: var(--surface);
    backdrop-filter: blur(14px);
    color: var(--text);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(14px);
    transition: opacity var(--mid) var(--ease), transform var(--mid) var(--ease), visibility var(--mid) var(--ease), background var(--fast) var(--ease);
    box-shadow: var(--shadow-sm);
}
.back-top.show { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--surface-hover); transform: translateY(-3px); }
.back-top svg { width: 19px; height: 19px; }

/* ==================== 13. 动画关键帧 ==================== */
@keyframes auroraFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(36px, -28px) scale(1.08); }
    66% { transform: translate(-22px, 22px) scale(0.95); }
}
@keyframes floatPhone {
    0%, 100% { transform: translateY(0) rotate(-1.2deg); }
    50% { transform: translateY(-18px) rotate(1.2deg); }
}
@keyframes chipFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.45; }
    50% { transform: scale(1.6); opacity: 0; }
}
@keyframes wheel {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    70% { opacity: 0; transform: translateX(-50%) translateY(12px); }
    100% { opacity: 0; }
}
@keyframes tickerMove {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}
@keyframes ctaGlow {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}
/* 滚动显现 */
.reveal {
    opacity: 0;
    transform: translateY(34px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.revealed { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
@media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    .aurora, .phone-mockup, .float-chip { animation: none; }
}

/* ==================== 14. 响应式适配 ==================== */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; text-align: center; gap: 56px; padding: 56px 24px 96px; }
    .hero-content { order: 2; }
    .hero-visual { order: 1; }
    .hero-desc { margin: 0 auto 30px; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .chip-1 { left: 6%; }
    .chip-2 { right: 4%; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .section { padding: 76px 0; }
    .cta-panel { margin: 76px auto; padding: 60px 32px; }
}
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-h);
        left: 0; right: 0;
        background: var(--navbar-bg);
        backdrop-filter: blur(24px);
        flex-direction: column;
        padding: 18px;
        gap: 8px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
    }
    .nav-links.active { display: flex; }
    .nav-link { width: 100%; text-align: left; padding: 12px 16px; border-radius: 12px; }
    .nav-toggle { display: flex; }
    .brand-badge { display: none; }
    .hero-title { font-size: 36px; }
    .stat { padding: 0 20px; }
    .stat-num { font-size: 26px; }
    .features-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .footer-grid { grid-template-columns: 1fr; gap: 36px; }
    .section { padding: 64px 0; }
    .section-head { margin-bottom: 40px; }
    .cta-panel { margin: 64px auto; padding: 48px 24px; border-radius: 24px; }
    .announcement-item { flex-direction: column; gap: 12px; padding: 20px; }
    .ann-date { align-self: flex-end; }
    .float-chip { padding: 10px 13px; }
    .chip-1 { top: 40px; left: 0; }
    .chip-2 { right: 0; bottom: 90px; }
    .chip-3 { display: none; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-actions .btn { width: 100%; max-width: 300px; }
    .container { padding: 0 16px; }
}
@media (max-width: 480px) {
    :root { --nav-h: 60px; }
    .brand-name { font-size: 16px; }
    .hero-inner { padding: 40px 16px 84px; gap: 44px; }
    .hero-title { font-size: 30px; }
    .hero-desc { font-size: 14.5px; }
    .phone-mockup { width: 196px; height: 402px; border-radius: 32px; padding: 8px; }
    .phone-screen { border-radius: 25px; }
    .phone-notch { width: 70px; height: 18px; top: 9px; }
    .phone-app-icon { width: 56px; height: 56px; border-radius: 16px; }
    .phone-app-icon svg { width: 24px; height: 24px; }
    .hero-stats { gap: 8px; flex-wrap: wrap; }
    .stat { padding: 0 14px; }
    .stat-num { font-size: 22px; }
    .stat-label { font-size: 11px; }
    .download-grid { grid-template-columns: 1fr; }
    .showcase-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .back-top { right: 16px; bottom: 20px; width: 42px; height: 42px; }
    .toast { max-width: 86vw; text-align: center; }
}

/* ==================== 14. 新增组件（筛选 / 空状态 / 更新时间 / 页脚联系方式） ==================== */
/* 锚点滚动偏移：吸顶导航不遮挡标题 */
section[id] { scroll-margin-top: calc(var(--nav-h) + 18px); }

/* 下载中心平台筛选 */
.download-filters {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin: -26px 0 36px;
}
.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 9px 22px;
    border-radius: 100px;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-2);
    font-size: 13px;
    font-weight: 600;
    font-family: var(--font);
    cursor: pointer;
    transition: all var(--fast) var(--ease);
}
.filter-btn:hover {
    color: var(--text);
    border-color: var(--border-strong);
    transform: translateY(-1px);
}
.filter-btn.active {
    background: var(--gradient-primary);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 8px 22px rgba(124, 92, 255, 0.35);
}
/* 空状态提示 */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 72px 24px;
    text-align: center;
    color: var(--text-3);
    background: var(--surface);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-lg);
}
.empty-state svg {
    width: 52px; height: 52px;
    color: var(--violet);
    opacity: 0.75;
}
.empty-state p { font-size: 14.5px; }
.empty-state.compact { padding: 48px 24px; }
.empty-state.compact svg { width: 42px; height: 42px; }
/* 版本更新时间 */
.card-updated {
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 11.5px;
    color: var(--text-3);
    position: relative;
    z-index: 1;
}
.card-updated svg { width: 12px; height: 12px; color: var(--pc); }
/* 页脚联系方式 */
.footer-contact {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-2);
    font-size: 13px;
    word-break: break-all;
}
.footer-contact svg { width: 14px; height: 14px; color: var(--violet); flex-shrink: 0; }