* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --primary: #ff6b6b;
    --primary-dark: #ee5a24;
    --secondary: #ffd93d;
    --accent: #6c5ce7;
    --cyan: #00cec9;
    --pink: #fd79a8;
    --text: #ffffff;
    --text-dark: #2d3436;
    --glass: rgba(255,255,255,0.12);
    --glass-border: rgba(255,255,255,0.2);
}

html { scroll-behavior: smooth; }

html, body {
    width: 100%; overflow-x: hidden;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text); background: #0a0a0a;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) #1a1a1a;
}

body { min-height: 100vh; }

a { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

::selection { background: var(--primary); color: #fff; }

/* ===== 自定义滚动条 ===== */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: #1a1a1a; }
::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary), var(--accent));
    border-radius: 4px;
}

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    padding: 18px 48px;
    display: flex; align-items: center; justify-content: space-between;
    transition: all .5s cubic-bezier(.4,0,.2,1);
    background: linear-gradient(180deg, rgba(0,0,0,0.6) 0%, transparent 100%);
}
.navbar.scrolled {
    padding: 12px 48px;
    background: rgba(10,10,10,0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 4px 30px rgba(0,0,0,0.5);
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.navbar-brand { display: flex; align-items: center; gap: 14px; cursor: pointer; }

/* ==================== Logo（✅ 已移除扫描动画） ==================== */
.brand-logo {
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px; font-weight: 900; color: #fff;
    position: relative;
    overflow: hidden;

    /* ✅ 高级玻璃质感（无动画） */
    background: linear-gradient(
        135deg,
        rgba(255,255,255,0.12),
        rgba(255,255,255,0.04)
    );
    border-radius: 5px;
    border: none;
    box-shadow:
        0 4px 15px rgba(0,0,0,0.25),
        inset 0 1px 0 rgba(255,255,255,0.08);

    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

/* ✅ 点击反馈（像 App） */
.brand-logo:active {
    transform: scale(0.95);
    box-shadow:
        0 2px 8px rgba(0,0,0,0.3),
        inset 0 1px 0 rgba(255,255,255,0.06);
}

/* ❌ 已彻底删除 shimmer 扫描动画 */

.brand-name {
    font-size: 22px; font-weight: 800; letter-spacing: 1px; color: #fff;
    background: linear-gradient(135deg, #fff, rgba(255,255,255,0.7));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}

.navbar-links { display: flex; align-items: center; gap: 4px; }
.navbar-links a {
    padding: 10px 20px; border-radius: 12px;
    font-size: 14px; font-weight: 500;
    color: rgba(255,255,255,0.7);
    transition: all .35s ease;
    position: relative;
}
.navbar-links a::after {
    content: ''; position: absolute; bottom: 4px; left: 50%;
    width: 0; height: 2px; border-radius: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: all .3s ease; transform: translateX(-50%);
}
.navbar-links a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.navbar-links a:hover::after { width: 60%; }

.navbar-toggle {
    display: none; width: 44px; height: 44px; border: none;
    background: rgba(255,255,255,0.1); border: 1px solid rgba(255,255,255,0.15);
    border-radius:12px; cursor: pointer; flex-direction: column;
    align-items: center; justify-content: center; gap: 5px;
}
.navbar-toggle span {
    display: block; width: 20px; height: 2px;
    background: #fff; border-radius: 2px; transition: .3s;
}

/* ==================== 视频 Hero ==================== */
.video-hero {
    position: relative; width: 100%; height: 100vh; min-height: 650px;
    overflow: hidden; display: flex; align-items: center; justify-content: center;
}
.video-hero video {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%,-50%);
    min-width: 100%; min-height: 100%; width: auto; height: auto;
    object-fit: cover; z-index: 0;
}
.video-overlay {
    position: absolute; inset: 0; z-index: 1;
    background:
        radial-gradient(ellipse at 50% 40%, rgba(0,0,0,0.1) 0%, rgba(0,0,0,0.6) 100%),
        linear-gradient(180deg, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.3) 50%, rgba(0,0,0,0.85) 100%);
}

/* 浮动粒子 */
.particles { position: absolute; inset: 0; z-index: 1; overflow: hidden; pointer-events: none; }
.particle {
    position: absolute; bottom: -20px;
    width: 6px; height: 6px; border-radius: 50%;
    background: rgba(255,255,255,0.3);
    animation: floatUp linear infinite;
}
.particle:nth-child(1) { left: 10%; width: 4px; height: 4px; animation-duration: 8s; animation-delay: 0s; }
.particle:nth-child(2) { left: 25%; width: 8px; height: 8px; animation-duration: 12s; animation-delay: 2s; background: rgba(255,217,61,0.2); }
.particle:nth-child(3) { left: 40%; width: 5px; height: 5px; animation-duration: 10s; animation-delay: 1s; }
.particle:nth-child(4) { left: 55%; width: 6px; height: 6px; animation-duration: 14s; animation-delay: 3s; background: rgba(108,92,231,0.3); }
.particle:nth-child(5) { left: 70%; width: 4px; height: 4px; animation-duration: 9s; animation-delay: 0.5s; }
.particle:nth-child(6) { left: 85%; width: 7px; height: 7px; animation-duration: 11s; animation-delay: 4s; background: rgba(255,107,107,0.2); }
.particle:nth-child(7) { left: 15%; width: 5px; height: 5px; animation-duration: 13s; animation-delay: 2.5s; }
.particle:nth-child(8) { left: 60%; width: 3px; height: 3px; animation-duration: 7s; animation-delay: 1.5px; background: rgba(0,206,201,0.3); }
.particle:nth-child(9) { left: 90%; width: 6px; height: 6px; animation-duration: 15s; animation-delay: 0s; }
.particle:nth-child(10) { left: 35%; width: 4px; height: 4px; animation-duration: 10s; animation-delay: 3.5s; background: rgba(255,217,61,0.15); }

@keyframes floatUp {
    0% { transform: translate3d(0, 0, 0) scale(1); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translate3d(0, -110vh, 0) scale(0.3); opacity: 0; }
}

/* Hero 内容 */
.hero-content {
    position: relative; z-index: 2; text-align: center;
    padding: 0 24px; max-width: 960px;
}

.hero-badge {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 10px 24px;
    background: rgba(255,255,255,0.08);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50px;
    font-size: 14px; color: rgba(255,255,255,0.9);
    margin-bottom: 28px;
    animation: fadeInDown .8s ease both;
}
.hero-badge .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--secondary);
    box-shadow: 0 0 10px var(--secondary);
    animation: pulse 2s infinite;
}
@keyframes pulse {
    0%,100% { opacity: 1; transform: scale(1); }
    50% { opacity: .4; transform: scale(1.4); }
}

.hero-title {
    font-size: clamp(34px, 5.5vw, 60px);
    font-weight: 900; line-height: 1.25;
    margin-bottom: 22px;
    text-shadow: 0 4px 30px rgba(0,0,0,0.5);
    animation: fadeInUp .8s ease .15s both;
}
.hero-title .highlight {
    background: linear-gradient(135deg, #ff6b6b, #ffd93d, #ff6b6b);
    background-size: 200% 200%;
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradientShift 4s ease infinite;
}
@keyframes gradientShift {
    0%,100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: clamp(15px, 2vw, 19px);
    color: rgba(255,255,255,0.8); line-height: 1.9;
    margin-bottom: 44px;
    animation: fadeInUp .8s ease .3s both;
}

.hero-actions {
    display: flex; align-items: center; justify-content: center; gap: 18px;
    flex-wrap: wrap; animation: fadeInUp .8s ease .45s both;
}

.btn-download {
    display: flex; align-items: center; gap: 12px;
    padding: 16px 32px; border-radius: 16px;
    font-size: 16px; font-weight: 700;
    transition: all .4s cubic-bezier(.4,0,.2,1);
    border: none; cursor: pointer; position: relative; overflow: hidden;
}
.btn-download::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0; transition: opacity .3s;
}
.btn-download:hover::before { opacity: 1; }
.btn-download.appstore { background: rgba(255,255,255,0.95); color: #1a1a1a; }
.btn-download.appstore:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 40px rgba(255,255,255,0.3);
}
.btn-download.android {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
}
.btn-download.android:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 40px rgba(238,90,36,0.5);
}

.btn-icon { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; }
.btn-icon img { width: 100%; height: 100%; object-fit: contain; }
.btn-text { text-align: left; line-height: 1.2; }
.btn-text small { display: block; font-size: 11px; font-weight: 400; opacity: 0.65; }

/* =======================
   高级下滑引导（✅ 不跳、不丑、像原生）
   ======================= */

.scroll-guide {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    /* ✅ 去掉所有背景、边框、毛玻璃！只保留内边距让点击区域变大 */
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    cursor: pointer;
    
    /* ✅ 极轻微的淡入淡出，节奏放慢到 3 秒 */
    animation: slowFade 3s ease-in-out infinite;
    transition: opacity 0.3s ease;
}
@keyframes slowFade {
    0%, 100% {
        opacity: 0.3;
    }
    50% {
        opacity: 1;
    }
}
.scroll-guide.hidden {
    opacity: 0;
    pointer-events: none;
}
.scroll-guide:hover svg path {
    stroke: rgba(255,255,255, 1);
}
.scroll-guide:hover {
    background: rgba(255,255,255,0.12);
}

/* ==================== 通用 Section ==================== */
.section { padding: 110px 24px; position: relative; }
.section-dark {
    background: linear-gradient(180deg, #0a0a0a 0%, #111 30%, #0d0d1a 70%, #0a0a0a 100%);
}
.container { max-width: 1100px; margin: 0 auto; }

.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
    display: inline-block; padding: 8px 22px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50px; font-size: 13px; font-weight: 600;
    margin-bottom: 18px; letter-spacing: 1px;
    box-shadow: 0 4px 15px rgba(238,90,36,0.3);
}
.section-title { font-size: clamp(24px, 4vw, 40px); font-weight: 900; line-height: 1.4; }
.section-desc {
    font-size: 16px; color: rgba(255,255,255,0.6);
    margin-top: 14px; line-height: 1.8;
    max-width: 600px; margin-left: auto; margin-right: auto;
}

/* ==================== 图标 ==================== */
.icon-img { width: 100%; height: 100%; object-fit: contain; }
.icon-wrapper {
    display: flex; align-items: center; justify-content: center;
    transition: transform .4s ease;
}

/* ==================== 关于我们 ==================== */
.about-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.about-card {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 24px; padding: 40px 30px;
    text-align: center; transition: all .5s cubic-bezier(.4,0,.2,1);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    position: relative; overflow: hidden;
}
.about-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--secondary), var(--accent));
    transform: scaleX(0); transition: transform .5s ease;
}
.about-card:hover::before { transform: scaleX(1); }
.about-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255,255,255,0.18);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.about-card .icon-wrapper {
    width: 72px; height: 72px; border-radius: 20px;
    margin: 0 auto 24px; padding: 16px;
}
.about-card:hover .icon-wrapper { transform: scale(1.1) rotate(5deg); }
.about-card h3 { font-size: 19px; margin-bottom: 12px; color: #fff; font-weight: 700; }
.about-card p { font-size: 14px; color: rgba(255,255,255,0.6); line-height: 1.8; }

/* ==================== 功能展示 ==================== */
.features-section {
    background: linear-gradient(180deg, #f8f9fa 0%, #eef0f5 100%);
    color: var(--text-dark);
}
.features-section .section-title { color: var(--text-dark); }
.features-section .section-desc { color: #636e72; }

.features-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.feature-item {
    display: flex; gap: 20px; align-items: flex-start;
    padding: 30px; background: #fff; border-radius: 20px;
    box-shadow: 0 2px 16px rgba(0,0,0,0.05);
    transition: all .4s cubic-bezier(.4,0,.2,1);
    border: 1px solid rgba(0,0,0,0.04);
    position: relative; overflow: hidden;
}
.feature-item::after {
    content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--primary));
    transform: scaleX(0); transform-origin: left; transition: transform .4s ease;
}
.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.1);
}
.feature-item:hover::after { transform: scaleX(1); }

.feature-icon {
    flex-shrink: 0; width: 56px; height: 56px; border-radius: 16px;
    display: flex; align-items: center; justify-content: center; padding: 11px;
}
.feature-text h4 { font-size: 17px; margin-bottom: 8px; color: var(--text-dark); font-weight: 700; }
.feature-text p { font-size: 14px; color: #636e72; line-height: 1.7; }

/* ==================== 数据统计 ==================== */
.stats-section {
    position: relative; overflow: hidden;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    padding: 90px 24px;
}
.stats-section::before {
    content: ''; position: absolute; inset: 0;
    background:
        radial-gradient(circle at 15% 50%, rgba(108,92,231,0.3) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(255,107,107,0.2) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(0,206,201,0.15) 0%, transparent 50%);
}
.stats-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
    max-width: 1000px; margin: 0 auto; position: relative; z-index: 1;
}
.stat-card { text-align: center; padding: 28px 16px; }
.stat-number {
    font-size: clamp(30px, 4.5vw, 46px); font-weight: 900;
    color: #fff; line-height: 1.1;
    text-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.stat-label {
    font-size: 14px; color: rgba(255,255,255,0.75);
    margin-top: 10px; letter-spacing: 1px;
}

/* ==================== 下载区域 ==================== */
.download-section {
    background: #0a0a0a; padding: 120px 24px; text-align: center;
    position: relative; overflow: hidden;
}
.download-section::before {
    content: ''; position: absolute; width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(238,90,36,0.12) 0%, transparent 70%);
    top: 50%; left: 50%; transform: translate(-50%,-50%); border-radius: 50%;
}
.download-section::after {
    content: ''; position: absolute; width: 300px; height: 300px;
    background: radial-gradient(circle, rgba(108,92,231,0.1) 0%, transparent 70%);
    bottom: -50px; right: -50px; border-radius: 50%;
}
.download-content { position: relative; z-index: 1; }
.download-section .section-title { color: #fff; margin-bottom: 16px; }
.download-section .section-desc { color: rgba(255,255,255,0.55); margin-bottom: 48px; }
.download-buttons { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }

/* ==================== 页脚 ==================== */
.footer-nav { background: #080808; padding: 70px 24px 24px; position: relative; }
.footer-nav::before {
    content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: 80%; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
}
.footer-grid {
    max-width: 1100px; margin: 0 auto;
    display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 36px; margin-bottom: 40px;
    text-align: center;
}
.footer-brand { display: flex; flex-direction: column; gap: 14px; }
.footer-brand p { font-size: 13px; color: rgba(255,255,255,0.4); line-height: 1.7; }
.footer-col h5 { font-size: 15px; font-weight: 700; color: #fff; margin-bottom: 18px; }
.footer-col a {
    display: block; font-size: 13px; color: rgba(255,255,255,0.4);
    margin-bottom: 12px; transition: all .3s;
}
.footer-col a:hover { color: var(--primary); transform: translateX(4px); }

.footer-bottom {
    max-width: 1100px; margin: 0 auto; padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.06);
    text-align: center; font-size: 13px; color: rgba(255,255,255,0.25); line-height: 1.8;
}
.footer-bottom a { color: rgba(255,255,255,0.4); }
.footer-bottom a:hover { color: var(--primary); }

/* ==================== 返回顶部 ==================== */
.back-to-top {
    position: fixed; bottom: 36px; right: 36px;
    width: 52px; height: 52px; border: none; border-radius: 16px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; font-size: 22px; cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 6px 24px rgba(238,90,36,0.4);
    opacity: 0; visibility: hidden;
    transform: translateY(20px) scale(0.8);
    transition: all .4s cubic-bezier(.4,0,.2,1);
    z-index: 999;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.back-to-top:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 10px 36px rgba(238,90,36,0.6);
}
.back-to-top svg { width: 22px; height: 22px; fill: #fff; }

.back-to-top .progress-ring {
    position: absolute; top: -3px; left: -3px;
    width: 58px; height: 58px; transform: rotate(-90deg);
}
.back-to-top .progress-ring circle {
    fill: none; stroke-width: 3;
    stroke: rgba(255,255,255,0.3); stroke-linecap: round;
}
.back-to-top .progress-ring .progress-bar {
    stroke: url(#gradient);
    stroke-dasharray: 173; stroke-dashoffset: 173;
    transition: stroke-dashoffset .15s ease;
}

/* ==================== 观察器动画 ==================== */
.reveal {
    opacity: 0;
    transform: translate3d(0, 40px, 0);
    transition: all .8s cubic-bezier(.4,0,.2,1);
}
.reveal.visible {
    opacity: 1;
    transform: translate3d(0, 0, 0);
}

/* 卡片延迟 */
.about-card.reveal:nth-child(1) { transition-delay: 0s; }
.about-card.reveal:nth-child(2) { transition-delay: .15s; }
.about-card.reveal:nth-child(3) { transition-delay: .3s; }
.feature-item.reveal:nth-child(odd) { transition-delay: 0s; }
.feature-item.reveal:nth-child(even) { transition-delay: .12s; }

/* ==================== 视频占位 ==================== */
.video-placeholder {
    position: absolute; inset: 0; z-index: 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
}
.video-placeholder::after {
    content: ''; position: absolute; inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(238,90,36,0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 30%, rgba(108,92,231,0.15) 0%, transparent 50%),
        radial-gradient(circle at 50% 80%, rgba(255,217,61,0.1) 0%, transparent 50%);
}

/* ==================== 鼠标跟随光晕 ==================== */
.cursor-glow {
    position: fixed; width: 300px; height: 300px;
    border-radius: 50%; pointer-events: none; z-index: 9999;
    background: radial-gradient(circle, rgba(255,107,107,0.08) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    transition: opacity .3s; opacity: 0;
}

/* ==================== 响应式 ==================== */
@media (max-width: 900px) {
    .about-grid { grid-template-columns: 1fr; gap: 16px; }
    .features-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 24px; }
}

@media (max-width: 640px) {
    .navbar { padding: 12px 16px; }
    .navbar.scrolled { padding: 10px 16px; }
    .brand-name { font-size: 16px; }
    .navbar-links {
        display: none; position: absolute; top: 100%; left: 0; right: 0;
        flex-direction: column; background: rgba(10,10,10,0.97);
        backdrop-filter: blur(16px); padding: 16px; gap: 4px;
    }
    .navbar-links.open { display: flex; }
    .navbar-links a { width: 100%; text-align: center; padding: 14px; font-size: 15px; }
    .navbar-toggle { display: flex; }

    .video-hero { min-height: 100vh; height: auto; padding: 80px 0 60px; }
    .hero-content { padding: 0 18px; }
    .hero-badge { font-size: 12px; padding: 8px 16px; }
    .hero-actions { flex-direction: column; width: 100%; max-width: 280px; margin: 0 auto; }
    .btn-download { width: 100%; justify-content: center; padding: 15px 20px; font-size: 15px; }

    .section { padding: 70px 16px; }
    .section-header { margin-bottom: 40px; }
    .about-card { padding: 30px 22px; }
    .feature-item { padding: 22px; gap: 14px; }
    .feature-icon { width: 46px; height: 46px; padding: 9px; border-radius: 12px; }

    .download-buttons { flex-direction: column; align-items: center; }
    .download-btn { width: 100%; max-width: 280px; }

    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .footer-brand { text-align: center; align-items: center; }
    .footer-col { text-align: center; }

    .scroll-hint { bottom: 18px; }
    .back-to-top { bottom: 20px; right: 20px; width: 46px; height: 46px; border-radius: 14px; }
    .back-to-top .progress-ring { width: 52px; height: 52px; }
}

@media (max-width: 380px) {
    .hero-title { font-size: 28px; }
    .stat-number { font-size: 26px; }
}

/* 减少动画偏好（无障碍 & 省电） */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}