/* ============================================
   推推乐官网 - 主样式表
   默认色调：#73B9E8 蓝色系
   ============================================ */

/* ========== CSS Variables & Reset ========== */
:root {
    --bg-deep: #06080c;
    --bg-dark: #0a0f17;
    --bg-card: #0d131c;
    --blue-primary: #73B9E8;
    --blue-light: #9DD1F1;
    --blue-dark: #4A90C4;
    --blue-glow: #254a6e;
    --blue-deep: #0d1a2d;
    --red: #e0554a;
    --red-glow: #ff6b60;
    --white: #eef2f6;
    --white-soft: rgba(238, 242, 246, 0.82);
    --white-dim: rgba(238, 242, 246, 0.58);
    --border-subtle: rgba(255, 255, 255, 0.06);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --shadow-blue: 0 0 40px rgba(115, 185, 232, 0.25);
    --font-display: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background: var(--bg-deep);
    color: var(--white);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ========== Animated Background ========== */
.bg-ambient {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}
.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.15;
    animation: orbFloat 20s ease-in-out infinite;
}
.bg-orb:nth-child(1) {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--blue-glow) 0%, transparent 70%);
    top: -10%;
    left: -5%;
    animation-delay: 0s;
}
.bg-orb:nth-child(2) {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--blue-primary) 0%, transparent 70%);
    bottom: -5%;
    right: -10%;
    animation-delay: -7s;
    opacity: 0.1;
}
.bg-orb:nth-child(3) {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--red) 0%, transparent 70%);
    top: 40%;
    left: 50%;
    animation-delay: -14s;
    opacity: 0.08;
}
@keyframes orbFloat {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(60px, -40px) scale(1.15); }
    50% { transform: translate(-30px, 50px) scale(0.9); }
    75% { transform: translate(-50px, -30px) scale(1.1); }
}

/* ========== Navigation ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 40px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.4s var(--transition-smooth);
    backdrop-filter: blur(0px);
    -webkit-backdrop-filter: blur(0px);
}
.nav.scrolled {
    background: rgba(6, 8, 12, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}
.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--white);
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}
.nav-logo .logo-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--blue-glow), var(--blue-deep));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    box-shadow: 0 0 20px rgba(37, 74, 110, 0.4);
}
.logo-img {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    object-fit: cover;
    box-shadow: 0 0 20px rgba(37, 74, 110, 0.35);
    flex-shrink: 0;
}
.logo-img-sm {
    width: 32px;
    height: 32px;
    vertical-align: middle;
    margin-right: 6px;
}
.footer-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 12px;
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 36px;
    align-items: center;
}
.nav-links a {
    color: var(--white-soft);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--blue-primary);
    transition: width 0.3s var(--transition-smooth);
}
.nav-links a:hover {
    color: var(--blue-light);
}
.nav-links a:hover::after {
    width: 100%;
}
.nav-cta {
    background: linear-gradient(135deg, var(--blue-dark), var(--blue-primary));
    color: #06080c !important;
    padding: 10px 22px;
    border-radius: 50px;
    font-weight: 700 !important;
    font-size: 0.9rem !important;
    transition: all 0.3s var(--transition-smooth) !important;
    box-shadow: 0 4px 20px rgba(115, 185, 232, 0.3);
}
.nav-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(115, 185, 232, 0.5);
}
.nav-cta::after {
    display: none !important;
}
.nav-mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--white);
    font-size: 1.8rem;
    cursor: pointer;
}

/* ========== Hero Section ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 40px 80px;
    overflow: hidden;
    isolation: isolate;
}
.hero-scrim {
    position: absolute;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background:
        radial-gradient(ellipse 58% 48% at 50% 42%, rgba(6, 8, 12, 0.78) 0%, rgba(6, 8, 12, 0.35) 52%, transparent 78%),
        linear-gradient(180deg, rgba(6, 8, 12, 0.22) 0%, transparent 30%, transparent 70%, rgba(6, 8, 12, 0.4) 100%);
}
.hero-content {
    position: relative;
    z-index: 3;
    text-align: center;
    max-width: 820px;
    padding: 48px 52px 44px;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(115, 185, 232, 0.22);
    background: linear-gradient(165deg, rgba(10, 16, 26, 0.88) 0%, rgba(8, 12, 20, 0.78) 100%);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    box-shadow:
        0 24px 80px rgba(0, 0, 0, 0.55),
        inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 50px;
    border: 1px solid rgba(115, 185, 232, 0.45);
    color: var(--blue-light);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 2px;
    margin-bottom: 28px;
    background: rgba(115, 185, 232, 0.08);
    animation: fadeInUp 0.8s ease both;
}
.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 900;
    line-height: 1.12;
    letter-spacing: -1px;
    color: var(--white);
    text-shadow: 0 2px 24px rgba(0, 0, 0, 0.45);
    animation: fadeInUp 0.8s 0.15s ease both;
}
.hero-title .brand {
    display: inline-block;
    color: var(--blue-light);
    background: linear-gradient(135deg, #d4ecfb 0%, var(--blue-light) 35%, var(--blue-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 12px rgba(0, 0, 0, 0.85)) drop-shadow(0 0 28px rgba(115, 185, 232, 0.35));
}
.hero-subtitle {
    margin-top: 24px;
    font-size: 1.12rem;
    color: var(--white-soft);
    max-width: 620px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.85;
    animation: fadeInUp 0.8s 0.3s ease both;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 48px;
    animation: fadeInUp 0.8s 0.45s ease both;
}
.hero-stat {
    text-align: center;
}
.hero-stat-num {
    font-family: var(--font-display);
    font-size: 2.4rem;
    font-weight: 800;
    background: linear-gradient(180deg, var(--white) 0%, var(--blue-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-stat-label {
    font-size: 0.85rem;
    color: var(--white-dim);
    margin-top: 4px;
}
.hero-pill-row {
    flex-wrap: wrap;
    gap: 12px;
}
.hero-pill {
    display: inline-flex;
    align-items: center;
    padding: 10px 18px;
    border-radius: 999px;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--white);
    background: rgba(115, 185, 232, 0.12);
    border: 1px solid rgba(115, 185, 232, 0.32);
}
.hero-cta-group {
    margin-top: 44px;
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 0.8s 0.6s ease both;
}

/* ========== Buttons ========== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.35s var(--transition-smooth);
    position: relative;
    overflow: hidden;
    font-family: var(--font-display);
}
.btn-primary {
    background: linear-gradient(135deg, var(--blue-dark), #5aa3d4, var(--blue-primary));
    color: #06080c;
    box-shadow: var(--shadow-blue);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 50px rgba(115, 185, 232, 0.5);
}
.btn-outline {
    border: 2px solid rgba(255, 255, 255, 0.25);
    color: var(--white);
    background: rgba(255, 255, 255, 0.04);
    backdrop-filter: blur(10px);
}
.btn-outline:hover {
    border-color: var(--blue-primary);
    color: var(--blue-light);
    background: rgba(115, 185, 232, 0.08);
}

/* ========== Hero Floating Cards ========== */
.hero-cards {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 2;
}
.floating-card {
    position: absolute;
    width: 92px;
    height: 130px;
    border-radius: 10px;
    background: linear-gradient(165deg, #fffefb 0%, #f3eee6 55%, #ebe4d8 100%);
    box-shadow:
        0 14px 36px rgba(0, 0, 0, 0.5),
        0 2px 0 rgba(255, 255, 255, 0.65) inset,
        0 0 0 1px rgba(40, 32, 24, 0.12);
    animation: floatCard 10s ease-in-out infinite;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 8px 10px;
    opacity: 0.88;
    color: #1c1c1c;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}
.floating-card::before {
    content: '';
    position: absolute;
    inset: 4px;
    border-radius: 7px;
    border: 1.5px solid rgba(180, 150, 110, 0.45);
    pointer-events: none;
}
.floating-card.is-red { color: #c62828; }
.floating-card.is-black { color: #1a1a1a; }
.fc-corner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1;
    font-weight: 800;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
}
.fc-corner i {
    font-style: normal;
    font-size: 0.95rem;
    margin-top: 1px;
}
.fc-corner.br {
    align-self: flex-end;
    transform: rotate(180deg);
}
.fc-suit {
    position: relative;
    z-index: 1;
    font-size: 2.55rem;
    line-height: 1;
    margin: 2px 0;
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}
.floating-card:nth-child(1) { top: 10%; left: 5%; animation-delay: 0s; transform: rotate(-8deg); }
.floating-card:nth-child(2) { top: 14%; right: 5%; animation-delay: -2s; transform: rotate(6deg); }
.floating-card:nth-child(3) { bottom: 16%; left: 7%; animation-delay: -4s; transform: rotate(12deg); }
.floating-card:nth-child(4) { bottom: 12%; right: 5%; animation-delay: -6s; transform: rotate(-5deg); }
@keyframes floatCard {
    0%, 100% { transform: translateY(0) rotate(var(--r, 0deg)); opacity: 0.82; }
    25% { transform: translateY(-18px) rotate(calc(var(--r, 0deg) + 3deg)); opacity: 0.95; }
    50% { transform: translateY(-8px) rotate(calc(var(--r, 0deg) - 2deg)); opacity: 0.88; }
    75% { transform: translateY(-22px) rotate(calc(var(--r, 0deg) + 4deg)); opacity: 0.92; }
}

/* ========== Chip Particles ========== */
.chip-particle {
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 3px solid;
    animation: chipDrift 12s linear infinite;
    opacity: 0;
}
@keyframes chipDrift {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    5% { opacity: 0.6; }
    90% { opacity: 0.5; }
    100% { transform: translateY(-10vh) rotate(720deg); opacity: 0; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ========== Section Common ========== */
.section {
    position: relative;
    z-index: 1;
    padding: 100px 40px;
}
.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 60px;
}
.section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--blue-primary);
    text-transform: uppercase;
    margin-bottom: 16px;
}
.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.5px;
}
.section-desc {
    margin-top: 16px;
    color: var(--white-soft);
    font-size: 1.05rem;
    line-height: 1.75;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
}

/* ========== Features Section ========== */
#features {
    background: linear-gradient(180deg, transparent 0%, rgba(10, 15, 23, 0.8) 30%, rgba(10, 15, 23, 0.8) 70%, transparent 100%);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}
.features-grid-four {
    grid-template-columns: repeat(2, 1fr);
    max-width: 920px;
    margin: 0 auto;
}
.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: all 0.4s var(--transition-smooth);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--blue-primary), transparent);
    opacity: 0;
    transition: opacity 0.4s;
}
.feature-card:hover::before { opacity: 1; }
.feature-card:hover {
    transform: translateY(-6px);
    border-color: rgba(115, 185, 232, 0.3);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5), 0 0 30px rgba(115, 185, 232, 0.08);
}
.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(115, 185, 232, 0.15), rgba(115, 185, 232, 0.05));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    margin-bottom: 20px;
    border: 1px solid rgba(115, 185, 232, 0.2);
}
.feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 10px;
}
.feature-card p {
    color: var(--white-soft);
    font-size: 0.95rem;
    line-height: 1.65;
}

/* ========== Security Section ========== */
.section-security {
    position: relative;
}
.section-security::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(115, 185, 232, 0.06) 0%, transparent 65%);
    pointer-events: none;
}
.security-banner {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 28px 32px;
    margin-bottom: 36px;
    border-radius: var(--radius-xl);
    border: 1px solid rgba(115, 185, 232, 0.35);
    background: linear-gradient(135deg, rgba(115, 185, 232, 0.1) 0%, rgba(13, 19, 28, 0.85) 100%);
    box-shadow: var(--shadow-blue);
}
.security-banner-icon {
    font-size: 2.4rem;
    line-height: 1;
    flex-shrink: 0;
}
.security-banner-body h3 {
    font-family: var(--font-display);
    font-size: 1.35rem;
    margin-bottom: 10px;
    color: var(--blue-light);
}
.security-banner-body p {
    color: var(--white-soft);
    font-size: 0.98rem;
    line-height: 1.8;
}
.security-banner-body strong {
    color: var(--white);
}
.security-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 28px;
}
.security-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    transition: all 0.4s var(--transition-smooth);
}
.security-card:hover {
    border-color: rgba(115, 185, 232, 0.35);
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.35);
}
.security-card-tag {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--blue-light);
    background: rgba(115, 185, 232, 0.12);
    border: 1px solid rgba(115, 185, 232, 0.25);
    border-radius: 999px;
    padding: 4px 12px;
    margin-bottom: 14px;
}
.security-card h4 {
    font-family: var(--font-display);
    font-size: 1.15rem;
    margin-bottom: 10px;
}
.security-card p {
    color: var(--white-soft);
    font-size: 0.92rem;
    line-height: 1.75;
}
.security-notice {
    list-style: none;
    padding: 20px 24px;
    border-radius: var(--radius-md);
    background: rgba(224, 85, 74, 0.08);
    border: 1px solid rgba(224, 85, 74, 0.25);
}
.security-notice li {
    position: relative;
    padding-left: 18px;
    margin-bottom: 10px;
    color: var(--white-soft);
    font-size: 0.92rem;
    line-height: 1.6;
}
.security-notice li:last-child { margin-bottom: 0; }
.security-notice li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--red-glow);
    font-weight: 700;
}

/* ========== Download Section ========== */
#download { position: relative; }
.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.download-card.official-only::after {
    content: '官方正版';
    position: absolute;
    top: 14px;
    left: 20px;
    font-size: 0.72rem;
    color: var(--blue-light);
    font-weight: 600;
    letter-spacing: 0.5px;
}
.platform-note {
    margin-top: 18px;
    font-size: 0.82rem;
    color: var(--blue-light);
    line-height: 1.5;
    opacity: 0.9;
}
.download-card {
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(13, 19, 28, 0.5) 100%);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-xl);
    padding: 44px 32px;
    text-align: center;
    transition: all 0.5s var(--transition-smooth);
    position: relative;
    overflow: hidden;
}
.download-card.featured {
    border-color: rgba(115, 185, 232, 0.5);
    background: linear-gradient(180deg, rgba(115, 185, 232, 0.08) 0%, rgba(10, 15, 23, 0.9) 100%);
    box-shadow: var(--shadow-blue);
    transform: scale(1.03);
}
.download-card.featured::after {
    content: '🔥 最受欢迎';
    position: absolute;
    top: 14px;
    right: 20px;
    font-size: 0.75rem;
    color: var(--blue-light);
    font-weight: 600;
}
.download-card:hover {
    transform: translateY(-8px);
    border-color: rgba(115, 185, 232, 0.4);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.6);
}
.download-card.featured:hover {
    transform: scale(1.03) translateY(-8px);
}
.platform-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.2rem;
    border: 2px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.04);
    transition: all 0.4s;
}
.download-card:hover .platform-icon {
    border-color: var(--blue-primary);
    box-shadow: 0 0 30px rgba(115, 185, 232, 0.3);
}
.platform-name {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 6px;
}
.platform-ver {
    font-size: 0.85rem;
    color: var(--white-dim);
    margin-bottom: 8px;
}
.platform-size {
    font-size: 0.8rem;
    color: var(--white-dim);
    margin-bottom: 24px;
    opacity: 0.6;
}
.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 32px;
    border-radius: 50px;
    font-size: 0.95rem;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all 0.35s var(--transition-smooth);
    font-family: var(--font-display);
    width: 100%;
    justify-content: center;
}
.btn-download.pc {
    background: linear-gradient(135deg, #3a3f52, #565d79);
    color: #fff;
}
.btn-download.ios {
    background: linear-gradient(135deg, #1a1a1a, #333);
    color: #fff;
}
.btn-download.is-disabled,
.btn-download.ios.is-disabled {
    background: linear-gradient(135deg, #3a3a3a, #555);
    color: rgba(255, 255, 255, 0.7);
    cursor: not-allowed;
    opacity: 0.75;
}
.btn-download.android {
    background: linear-gradient(135deg, #1b4a5e, #2d6e8a);
    color: #fff;
}
.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}
.qr-code {
    margin-top: 20px;
    width: 110px;
    height: 110px;
    background: #fff;
    border-radius: var(--radius-sm);
    padding: 8px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.7;
    transition: opacity 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    color: #333;
    text-align: center;
    line-height: 1.3;
    border: 1px solid #ddd;
}
.download-card:hover .qr-code { opacity: 1; }

/* ========== Screenshot Gallery ========== */
#screenshots {
    background: linear-gradient(180deg, transparent 0%, rgba(10, 15, 23, 0.7) 30%, rgba(10, 15, 23, 0.7) 70%, transparent 100%);
}
.gallery {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding: 20px 0 40px;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.gallery::-webkit-scrollbar { display: none; }
.gallery-item {
    flex: 0 0 280px;
    scroll-snap-align: center;
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    transition: all 0.4s var(--transition-smooth);
    position: relative;
    cursor: pointer;
}
.gallery-item:hover {
    transform: scale(1.04);
    border-color: rgba(115, 185, 232, 0.5);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
}
.gallery-img {
    width: 100%;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    position: relative;
    overflow: hidden;
}
.gallery-img.scene1 { background: linear-gradient(180deg, #1a2a3a 0%, #0d1828 50%, #1a2030 100%); }
.gallery-img.scene2 { background: linear-gradient(180deg, #2a1a3a 0%, #180d28 50%, #2a1a2a 100%); }
.gallery-img.scene3 { background: linear-gradient(180deg, #3a2a1a 0%, #281d0d 50%, #2a2a1a 100%); }
.gallery-img.scene4 { background: linear-gradient(180deg, #1a3a2a 0%, #0d2818 50%, #1a2a1a 100%); }
.gallery-img.scene5 { background: linear-gradient(180deg, #2a1a2a 0%, #280d28 50%, #2a1a2a 100%); }
.gallery-label {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 16px;
    background: linear-gradient(0deg, rgba(0, 0, 0, 0.85) 0%, transparent 100%);
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
}
.mini-table {
    width: 85%;
    height: 55%;
    border-radius: 50%;
    background: radial-gradient(ellipse, #254a6e 0%, #0d1a2d 60%, #09121f 100%);
    border: 4px solid #5a3a1a;
    box-shadow: inset 0 0 60px rgba(0, 0, 0, 0.5), 0 8px 30px rgba(0, 0, 0, 0.4);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}
.mini-table::after {
    content: '';
    position: absolute;
    width: 78%;
    height: 78%;
    border-radius: 50%;
    border: 2px dashed rgba(255, 255, 255, 0.15);
}
.mini-cards { display: flex; gap: 6px; }
.mini-card {
    width: 28px;
    height: 40px;
    border-radius: 3px;
    background: #fff;
    font-size: 0.7rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}
.mini-card.red { color: #d32f2f; }
.mini-card.black { color: #212121; }

/* ========== CTA Banner ========== */
.cta-banner {
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
    padding: 64px 48px;
    border-radius: var(--radius-xl);
    background: linear-gradient(135deg, rgba(115, 185, 232, 0.1) 0%, rgba(13, 26, 45, 0.15) 50%, rgba(115, 185, 232, 0.08) 100%);
    border: 1px solid rgba(115, 185, 232, 0.25);
    text-align: center;
    backdrop-filter: blur(10px);
}
.cta-banner h2 {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 800;
    margin-bottom: 14px;
}
.cta-banner p {
    color: var(--white-dim);
    margin-bottom: 32px;
    font-size: 1.05rem;
}
.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== Footer ========== */
.footer {
    position: relative;
    z-index: 1;
    padding: 60px 40px 36px;
    border-top: 1px solid var(--border-subtle);
    text-align: center;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 32px;
    list-style: none;
    flex-wrap: wrap;
    margin-bottom: 24px;
}
.footer-links a {
    color: var(--white-dim);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}
.footer-links a:hover { color: var(--blue-light); }
.footer-copy {
    color: var(--white-dim);
    font-size: 0.8rem;
    opacity: 0.5;
}

/* ========== Scroll Reveal ========== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s var(--transition-smooth);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ========================================
    🎊 节假日主题系统 - CSS 变量覆盖
   ======================================== */

/* 春节 - 红金 */
html[data-holiday="spring-festival"] {
    --blue-primary: #e63946;
    --blue-light: #ff6b6b;
    --blue-dark: #c1121f;
    --blue-glow: #8b0000;
    --blue-deep: #1a0505;
    --shadow-blue: 0 0 50px rgba(230, 57, 70, 0.35);
}
/* 情人节 - 粉紫 */
html[data-holiday="valentine"] {
    --blue-primary: #e884a6;
    --blue-light: #ffb3c6;
    --blue-dark: #c94d7c;
    --blue-glow: #7b2d5b;
    --blue-deep: #1a0d20;
    --shadow-blue: 0 0 50px rgba(232, 132, 166, 0.35);
}
/* 端午/清明 - 翠绿 */
html[data-holiday="dragon-boat"] {
    --blue-primary: #7cb342;
    --blue-light: #aed581;
    --blue-dark: #558b2f;
    --blue-glow: #2e7d32;
    --blue-deep: #0a1f0d;
    --shadow-blue: 0 0 50px rgba(124, 179, 66, 0.35);
}
/* 中秋 - 月光金 */
html[data-holiday="mid-autumn"] {
    --blue-primary: #f9a825;
    --blue-light: #ffd54f;
    --blue-dark: #c17900;
    --blue-glow: #1a3a5c;
    --blue-deep: #0d1525;
    --shadow-blue: 0 0 50px rgba(249, 168, 37, 0.4);
}
/* 国庆/劳动节 - 中国红 */
html[data-holiday="national-day"] {
    --blue-primary: #e63946;
    --blue-light: #ffb347;
    --blue-dark: #c1121f;
    --blue-glow: #8b0000;
    --blue-deep: #1a0a0a;
    --shadow-blue: 0 0 50px rgba(230, 57, 70, 0.4);
}
/* 圣诞 - 红绿 */
html[data-holiday="christmas"] {
    --blue-primary: #d4343e;
    --blue-light: #ff6b6b;
    --blue-dark: #2e7d32;
    --blue-glow: #1b5e20;
    --blue-deep: #0a2a1a;
    --shadow-blue: 0 0 50px rgba(212, 52, 62, 0.35);
}
/* 元旦 - 金银 */
html[data-holiday="new-year"] {
    --blue-primary: #c0ca33;
    --blue-light: #e6ee9c;
    --blue-dark: #9e9d24;
    --blue-glow: #455a64;
    --blue-deep: #0d1520;
    --shadow-blue: 0 0 50px rgba(192, 202, 51, 0.4);
}
/* 万圣节/愚人节 - 橙紫 */
html[data-holiday="halloween"] {
    --blue-primary: #ff6f00;
    --blue-light: #ffab40;
    --blue-dark: #6a1b9a;
    --blue-glow: #6a1b9a;
    --blue-deep: #1a0d20;
    --shadow-blue: 0 0 50px rgba(255, 111, 0, 0.35);
}

/* 节日导航徽章 */
.holiday-badge {
    display: none;
    align-items: center;
    gap: 5px;
    padding: 5px 14px;
    border-radius: 50px;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    animation: holidayPopIn 0.6s ease 0.3s both;
    white-space: nowrap;
}
html[data-holiday] .holiday-badge { display: inline-flex; }
html[data-holiday="spring-festival"] .holiday-badge {
    background: linear-gradient(135deg, #c1121f, #e63946);
    color: #ffd700;
    box-shadow: 0 0 20px rgba(230, 57, 70, 0.5);
}
html[data-holiday="valentine"] .holiday-badge {
    background: linear-gradient(135deg, #c94d7c, #e884a6);
    color: #fff;
    box-shadow: 0 0 20px rgba(232, 132, 166, 0.5);
}
html[data-holiday="dragon-boat"] .holiday-badge {
    background: linear-gradient(135deg, #558b2f, #7cb342);
    color: #fff;
    box-shadow: 0 0 20px rgba(124, 179, 66, 0.5);
}
html[data-holiday="mid-autumn"] .holiday-badge {
    background: linear-gradient(135deg, #c17900, #f9a825);
    color: #1a1a1a;
    box-shadow: 0 0 20px rgba(249, 168, 37, 0.5);
}
html[data-holiday="national-day"] .holiday-badge {
    background: linear-gradient(135deg, #c1121f, #e63946);
    color: #ffd700;
    box-shadow: 0 0 20px rgba(230, 57, 70, 0.5);
    animation: holidayPopIn 0.6s ease 0.3s both, holidayPulse 2s ease-in-out 1s infinite;
}
html[data-holiday="christmas"] .holiday-badge {
    background: linear-gradient(135deg, #2e7d32, #c62828);
    color: #fff;
    box-shadow: 0 0 20px rgba(46, 125, 50, 0.5);
}
html[data-holiday="new-year"] .holiday-badge {
    background: linear-gradient(135deg, #9e9d24, #c0ca33);
    color: #1a1a1a;
    box-shadow: 0 0 20px rgba(192, 202, 51, 0.5);
}
html[data-holiday="halloween"] .holiday-badge {
    background: linear-gradient(135deg, #6a1b9a, #ff6f00);
    color: #fff;
    box-shadow: 0 0 20px rgba(255, 111, 0, 0.5);
}

/* 节日装饰容器 */
.holiday-decor {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}
.holiday-float {
    position: absolute;
    animation: holidayFloat 6s ease-in-out infinite;
    font-size: 2rem;
}
@keyframes holidayFloat {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-30px) rotate(5deg); }
}
@keyframes holidayPopIn {
    from { opacity: 0; transform: scale(0.5); }
    to { opacity: 1; transform: scale(1); }
}
@keyframes holidayPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(230, 57, 70, 0.5); }
    50% { box-shadow: 0 0 40px rgba(230, 57, 70, 0.8), 0 0 80px rgba(255, 215, 0, 0.4); }
}
/* 圣诞雪花 */
.snowflake {
    position: fixed;
    top: -10px;
    color: #fff;
    font-size: 1rem;
    pointer-events: none;
    z-index: 2;
    animation: snowFall linear infinite;
    opacity: 0.8;
}
@keyframes snowFall {
    0% { transform: translateY(-10px) rotate(0deg); opacity: 0.9; }
    100% { transform: translateY(105vh) rotate(360deg); opacity: 0.2; }
}
/* 节日活动提示条 */
.holiday-toast {
    position: fixed;
    top: 90px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 999;
    padding: 10px 24px;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 700;
    animation: holidayToast 0.5s ease 1s both;
    pointer-events: auto;
    cursor: pointer;
    transition: all 0.3s;
}
.holiday-toast:hover { transform: translateX(-50%) translateY(-3px); }
@keyframes holidayToast {
    from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
    to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ========== Telegram 客服悬浮按钮 ========== */
.telegram-fab {
    position: fixed;
    right: 24px;
    bottom: 32px;
    z-index: 1200;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    text-decoration: none;
    transition: transform 0.25s var(--transition-smooth);
}
.telegram-fab:hover {
    transform: translateY(-4px) scale(1.05);
}
.telegram-fab img {
    display: block;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    box-shadow: 0 8px 28px rgba(42, 171, 238, 0.5), 0 2px 8px rgba(0, 0, 0, 0.35);
}
.telegram-fab-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--white-soft);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
    line-height: 1;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .download-grid {
        grid-template-columns: 1fr;
        max-width: 420px;
        margin: 0 auto;
    }
    .download-card.featured { transform: scale(1); }
    .download-card.featured:hover { transform: translateY(-8px); }
}
@media (max-width: 768px) {
    .nav { padding: 0 20px; }
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 70%;
        max-width: 320px;
        height: 100vh;
        flex-direction: column;
        background: rgba(6, 8, 12, 0.97);
        backdrop-filter: blur(20px);
        padding: 100px 40px 40px;
        gap: 28px;
        transition: right 0.4s var(--transition-smooth);
        border-left: 1px solid var(--border-subtle);
    }
    .nav-links.open { right: 0; }
    .nav-mobile-toggle { display: block; z-index: 1100; }
    .hero { padding: 100px 20px 60px; }
    .hero-content {
        padding: 36px 24px 32px;
        border-radius: var(--radius-lg);
    }
    .hero-stats { gap: 28px; flex-wrap: wrap; }
    .hero-stat-num { font-size: 1.8rem; }
    .section { padding: 64px 20px; }
    .features-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
    .features-grid-four { grid-template-columns: 1fr; max-width: 400px; }
    .security-grid { grid-template-columns: 1fr; }
    .security-banner { flex-direction: column; padding: 24px 20px; }
    .cta-banner { padding: 40px 24px; margin: 0 16px; }
    .gallery-item { flex: 0 0 220px; }
    .gallery-img { height: 380px; }
    .floating-card { display: none; }
    .floating-card:nth-child(1),
    .floating-card:nth-child(2) {
        display: flex;
        width: 58px;
        height: 82px;
        padding: 5px 6px;
        opacity: 0.78;
    }
    .fc-corner { font-size: 0.78rem; }
    .fc-corner i { font-size: 0.72rem; }
    .fc-suit { font-size: 1.55rem; }
    .holiday-badge { font-size: 0.7rem; padding: 4px 10px; }
    .holiday-toast { top: 76px; font-size: 0.78rem; padding: 8px 18px; }
    .holiday-float { font-size: 1.3rem; }
    .telegram-fab {
        right: 16px;
        bottom: 20px;
    }
    .telegram-fab img { width: 50px; height: 50px; }
}
@media (max-width: 480px) {
    .hero-title { font-size: 2.4rem; }
    .hero-cta-group { flex-direction: column; align-items: center; }
    .btn { width: 100%; justify-content: center; }
    .footer-links { gap: 16px; }
}