/* 蘑菇视频官网 - 玻璃态梦幻科技风格 */
:root {
    --bg-primary: #111111;
    --bg-secondary: #1A1A1A;
    --accent-cyan: #A0F0FF;
    --accent-purple: #D8A0FF;
    --accent-warm: #F8F0E8;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(160, 240, 255, 0.15);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --text-primary: #F8F0E8;
    --text-secondary: rgba(248, 240, 232, 0.7);
    --gradient-main: linear-gradient(135deg, #A0F0FF 0%, #D8A0FF 50%, #F8F0E8 100%);
    --gradient-card: linear-gradient(135deg, rgba(160,240,255,0.08) 0%, rgba(216,160,255,0.08) 100%);
    --font-main: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ===== 粒子背景 ===== */
#particles-canvas {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.4;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 0 5%;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(17, 17, 17, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-logo {
    width: 40px;
    height: 40px;
    background: var(--gradient-main);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 900;
    color: #111;
    flex-shrink: 0;
}

.brand-name {
    font-size: 1.3rem;
    font-weight: 700;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 6px 14px;
    border-radius: 20px;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-cyan);
    background: rgba(160, 240, 255, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--accent-cyan);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ===== 搜索框 ===== */
.search-bar-wrapper {
    position: relative;
    z-index: 10;
    padding: 16px 5%;
    background: rgba(17, 17, 17, 0.7);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(160, 240, 255, 0.08);
    margin-top: 70px;
}

.search-bar-inner {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 0;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    border-radius: 40px;
    overflow: hidden;
    backdrop-filter: blur(10px);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-bar-inner:focus-within {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 20px rgba(160, 240, 255, 0.2);
}

.search-bar-inner input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    padding: 12px 20px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-main);
}

.search-bar-inner input::placeholder {
    color: var(--text-secondary);
}

.search-btn {
    padding: 12px 24px;
    background: var(--gradient-main);
    border: none;
    cursor: pointer;
    color: #111;
    font-weight: 600;
    font-size: 0.9rem;
    font-family: var(--font-main);
    transition: opacity 0.3s ease;
    white-space: nowrap;
}

.search-btn:hover { opacity: 0.85; }

/* ===== Hero Banner ===== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    text-align: center;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/hero-banner.jpg');
    background-size: cover;
    background-position: center;
    filter: brightness(0.4);
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at center, rgba(160,240,255,0.05) 0%, rgba(17,17,17,0.6) 70%);
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
    padding: 0 5%;
}

.hero-tag {
    display: inline-block;
    padding: 6px 18px;
    border: 1px solid var(--accent-cyan);
    border-radius: 20px;
    color: var(--accent-cyan);
    font-size: 0.85rem;
    margin-bottom: 24px;
    letter-spacing: 2px;
}

.hero h1 {
    font-size: clamp(2.2rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-btns {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary {
    padding: 14px 32px;
    background: var(--gradient-main);
    color: #111;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    font-family: var(--font-main);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(160, 240, 255, 0.4);
}

.btn-secondary {
    padding: 14px 32px;
    background: transparent;
    color: var(--accent-cyan);
    border: 1px solid var(--accent-cyan);
    border-radius: 30px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s ease;
    font-family: var(--font-main);
}

.btn-secondary:hover {
    background: rgba(160, 240, 255, 0.1);
    transform: translateY(-2px);
}

/* ===== 通用区块 ===== */
.section {
    position: relative;
    z-index: 1;
    padding: 80px 5%;
}

.section-header {
    text-align: center;
    margin-bottom: 56px;
}

.section-tag {
    display: inline-block;
    padding: 5px 16px;
    border: 1px solid var(--accent-purple);
    border-radius: 20px;
    color: var(--accent-purple);
    font-size: 0.8rem;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.section-title {
    font-size: clamp(1.6rem, 3vw, 2.4rem);
    font-weight: 700;
    margin-bottom: 14px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== 玻璃卡片 ===== */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--glass-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    overflow: hidden;
}

.glass-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(160, 240, 255, 0.15);
    border-color: rgba(160, 240, 255, 0.3);
}

/* ===== 视频卡片 ===== */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.video-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    background: var(--bg-secondary);
    border: 1px solid var(--glass-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.video-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(160, 240, 255, 0.2);
}

.video-thumb {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    overflow: hidden;
}

.video-thumb img {
    position: absolute;
    top: 0; left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.video-card:hover .video-thumb img {
    transform: scale(1.05);
}

.video-play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
    z-index: 2;
}

.video-card:hover .video-play-overlay {
    background: rgba(0,0,0,0.4);
}

.play-btn-circle {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: rgba(160, 240, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.7);
    transition: opacity 0.3s ease, transform 0.3s ease;
    box-shadow: 0 0 30px rgba(160, 240, 255, 0.6);
}

.video-card:hover .play-btn-circle {
    opacity: 1;
    transform: scale(1);
}

.play-btn-circle svg {
    width: 24px;
    height: 24px;
    fill: #111;
    margin-left: 4px;
}

.video-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    padding: 3px 10px;
    background: rgba(160, 240, 255, 0.2);
    border: 1px solid var(--accent-cyan);
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--accent-cyan);
    backdrop-filter: blur(10px);
    z-index: 3;
}

.video-info {
    padding: 16px;
    background: var(--gradient-card);
}

.video-title {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    display: flex;
    gap: 14px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.video-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ===== 统计数字 ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto 80px;
    text-align: center;
}

.stat-item {
    padding: 30px 20px;
}

.stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== 社区弹幕 ===== */
.danmaku-wrapper {
    position: relative;
    height: 80px;
    overflow: hidden;
    margin: 30px 0;
    mask-image: linear-gradient(to right, transparent, black 10%, black 90%, transparent);
}

.danmaku-track {
    display: flex;
    gap: 30px;
    animation: danmaku-scroll 30s linear infinite;
    white-space: nowrap;
    width: max-content;
}

@keyframes danmaku-scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.danmaku-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    backdrop-filter: blur(10px);
    white-space: nowrap;
}

.danmaku-item .avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: #111;
    font-weight: 700;
    flex-shrink: 0;
}

/* ===== AI模块 ===== */
.ai-section {
    position: relative;
    overflow: hidden;
}

.ai-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/ai-module-bg.jpg');
    background-size: cover;
    background-position: center;
    filter: brightness(0.2);
    z-index: 0;
}

.ai-features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.ai-feature-card {
    padding: 32px 24px;
    text-align: center;
}

.ai-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 16px;
    background: linear-gradient(135deg, rgba(160,240,255,0.2), rgba(216,160,255,0.2));
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}

.ai-feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--accent-cyan);
}

.ai-feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 专家模块 ===== */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
    max-width: 1200px;
    margin: 0 auto;
}

.expert-card {
    padding: 32px 24px;
    text-align: center;
}

.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    display: block;
    border: 2px solid var(--accent-cyan);
    box-shadow: 0 0 20px rgba(160, 240, 255, 0.3);
}

.expert-name {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.expert-title {
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 14px;
}

.expert-desc {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ===== 用户评价 ===== */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
    max-width: 1400px;
    margin: 0 auto;
}

.review-card {
    padding: 28px 24px;
}

.review-stars {
    color: #FFD700;
    font-size: 1rem;
    margin-bottom: 14px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
    font-style: italic;
}

.reviewer {
    display: flex;
    align-items: center;
    gap: 12px;
}

.reviewer-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    color: #111;
    flex-shrink: 0;
}

.reviewer-info .name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.reviewer-info .location {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    border-radius: 16px;
    overflow: hidden;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
}

.faq-question {
    padding: 20px 24px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.3s ease;
    user-select: none;
}

.faq-question:hover { color: var(--accent-cyan); }

.faq-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    border: 1px solid var(--accent-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-cyan);
    font-size: 1rem;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.faq-item.open .faq-icon { transform: rotate(45deg); }

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
    padding: 0 24px;
}

.faq-item.open .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

/* ===== 合作伙伴 ===== */
.partners-section {
    position: relative;
    overflow: hidden;
}

.partners-bg {
    position: absolute;
    inset: 0;
    background-image: url('../images/partner-bg.jpg');
    background-size: cover;
    background-position: center;
    filter: brightness(0.15);
    z-index: 0;
}

.partners-logos {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.partner-logo {
    padding: 16px 28px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

.partner-logo:hover {
    color: var(--accent-cyan);
    border-color: var(--accent-cyan);
    background: rgba(160, 240, 255, 0.05);
}

/* ===== 联系模块 ===== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-card {
    padding: 36px 28px;
    text-align: center;
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 16px;
    display: block;
}

.contact-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--accent-cyan);
}

.contact-card p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.qr-placeholder {
    width: 100px;
    height: 100px;
    margin: 16px auto 0;
    background: linear-gradient(135deg, rgba(160,240,255,0.1), rgba(216,160,255,0.1));
    border: 1px dashed var(--glass-border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
    background: rgba(10,10,10,0.95);
    border-top: 1px solid var(--glass-border);
    padding: 60px 5% 30px;
    position: relative;
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .brand-name {
    font-size: 1.5rem;
    margin-bottom: 14px;
    display: block;
}

.footer-brand p {
    font-size: 0.88rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer-col h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col ul li a {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-col ul li a:hover { color: var(--accent-cyan); }

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.social-links {
    display: flex;
    gap: 12px;
}

.social-link {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.social-link:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(160, 240, 255, 0.1);
}

/* ===== 内页Banner ===== */
.inner-hero {
    position: relative;
    height: 340px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    margin-top: 70px;
}

.inner-hero-bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    filter: brightness(0.3);
    z-index: 1;
}

.inner-hero-content {
    position: relative;
    z-index: 2;
    padding: 0 5%;
}

.inner-hero h1 {
    font-size: clamp(1.8rem, 4vw, 3rem);
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.inner-hero p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 16px 5%;
    font-size: 0.85rem;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.breadcrumb a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb a:hover { color: var(--accent-cyan); }

.breadcrumb span { margin: 0 8px; opacity: 0.4; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .contact-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav-links { display: none; }
    .nav-toggle { display: flex; }
    .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 70px; left: 0; right: 0;
        background: rgba(17,17,17,0.97);
        padding: 20px 5%;
        border-bottom: 1px solid var(--glass-border);
        backdrop-filter: blur(20px);
    }
    .video-grid { grid-template-columns: 1fr; }
    .experts-grid { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .hero-btns { flex-direction: column; align-items: center; }
}

@media (max-width: 480px) {
    .section { padding: 60px 4%; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
}

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

.fade-in-up {
    animation: fadeInUp 0.7s ease forwards;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.float-anim { animation: float 4s ease-in-out infinite; }

/* ===== 滚动动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ===== 社区话题 ===== */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.topic-card {
    padding: 24px 20px;
    cursor: pointer;
}

.topic-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.78rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.topic-tag.hot { background: rgba(255,100,100,0.15); color: #FF6464; border: 1px solid rgba(255,100,100,0.3); }
.topic-tag.new { background: rgba(160,240,255,0.15); color: var(--accent-cyan); border: 1px solid rgba(160,240,255,0.3); }
.topic-tag.trending { background: rgba(216,160,255,0.15); color: var(--accent-purple); border: 1px solid rgba(216,160,255,0.3); }

.topic-card h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.topic-card p {
    font-size: 0.83rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.topic-meta {
    display: flex;
    gap: 14px;
    margin-top: 14px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* ===== 更新时间 ===== */
.update-time {
    font-size: 0.82rem;
    color: var(--text-secondary);
    text-align: center;
    padding: 12px;
}