/* =============================================
   糖心Vlog 官网样式 - 明亮潮流·霓虹科技风
   ============================================= */

/* CSS变量 */
:root {
    --primary: #ff6b81;
    --secondary: #70a1ff;
    --accent: #ff4757;
    --bg: #f8f9ff;
    --bg-white: #ffffff;
    --text-dark: #2f3542;
    --text-gray: #747d8c;
    --card-shadow: 0 8px 32px rgba(112, 161, 255, 0.12);
    --neon-pink: 0 0 15px rgba(255, 107, 129, 0.6), 0 0 30px rgba(255, 107, 129, 0.3);
    --neon-blue: 0 0 15px rgba(112, 161, 255, 0.6), 0 0 30px rgba(112, 161, 255, 0.3);
    --gradient-main: linear-gradient(135deg, #ff6b81, #70a1ff);
    --gradient-bg: linear-gradient(135deg, rgba(255,107,129,0.08), rgba(112,161,255,0.08));
    --radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'WenQuanYi Micro Hei', sans-serif;
    background-color: var(--bg);
    color: var(--text-dark);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ---- 粒子背景 ---- */
.particles-bg {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0.15;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10% { opacity: 0.15; }
    90% { opacity: 0.15; }
    100% { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

/* ---- 顶部导航 ---- */
header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 107, 129, 0.15);
    box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 22px;
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 1px;
    text-decoration: none;
}

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

.nav-links a {
    display: inline-block;
    padding: 6px 14px;
    text-decoration: none;
    color: var(--text-dark);
    font-size: 14px;
    font-weight: 500;
    border-radius: 20px;
    transition: var(--transition);
}

.nav-links a:hover,
.nav-links a.active {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: var(--neon-pink);
}

/* ---- 搜索框 ---- */
.search-wrap {
    padding: 80px 24px 0;
    max-width: 1280px;
    margin: 0 auto;
}

.search-box {
    position: relative;
    max-width: 680px;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 14px 56px 14px 24px;
    border: 2px solid rgba(255, 107, 129, 0.25);
    border-radius: 40px;
    font-size: 15px;
    background: #fff;
    color: var(--text-dark);
    outline: none;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(112, 161, 255, 0.1);
}

.search-input:focus {
    border-color: var(--primary);
    box-shadow: var(--neon-pink);
}

.search-input::placeholder { color: #adb5bd; }

.search-btn {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 40px; height: 40px;
    background: var(--gradient-main);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.search-btn:hover { box-shadow: var(--neon-pink); transform: translateY(-50%) scale(1.1); }

.search-btn svg { width: 18px; height: 18px; fill: #fff; }

/* ---- 首屏Banner ---- */
.hero {
    position: relative;
    min-height: 88vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--gradient-bg);
    padding: 100px 24px 60px;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background: radial-gradient(ellipse at 30% 50%, rgba(255,107,129,0.12) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 30%, rgba(112,161,255,0.12) 0%, transparent 60%);
    animation: hero-glow 8s ease-in-out infinite alternate;
}

@keyframes hero-glow {
    0% { transform: scale(1) rotate(0deg); }
    100% { transform: scale(1.1) rotate(5deg); }
}

.hero-inner {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(255, 107, 129, 0.1);
    border: 1px solid rgba(255, 107, 129, 0.3);
    border-radius: 20px;
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 24px;
    letter-spacing: 1px;
}

.hero h1 {
    font-size: clamp(36px, 6vw, 72px);
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: clamp(16px, 2.5vw, 22px);
    color: var(--text-gray);
    margin-bottom: 40px;
    font-weight: 400;
}

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

/* ---- 按钮 ---- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 40px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--gradient-main);
    color: #fff;
    box-shadow: 0 4px 20px rgba(255, 107, 129, 0.35);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--neon-pink);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn-outline:hover {
    background: var(--gradient-main);
    color: #fff;
    border-color: transparent;
    transform: translateY(-3px);
}

/* ---- 通用Section ---- */
.section {
    padding: 80px 24px;
    position: relative;
    z-index: 1;
}

.section-alt { background: var(--bg-white); }

.container {
    max-width: 1280px;
    margin: 0 auto;
}

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

.section-tag {
    display: inline-block;
    padding: 4px 14px;
    background: var(--gradient-main);
    color: #fff;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(26px, 4vw, 40px);
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-gray);
    max-width: 560px;
    margin: 0 auto;
}

/* ---- 视频卡片网格 ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.video-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    position: relative;
    cursor: pointer;
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 60px rgba(112, 161, 255, 0.2);
}

.video-thumb-wrap {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, #f0f4ff, #ffe4ea);
}

.video-thumb-wrap img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
    display: block;
}

.video-card:hover .video-thumb-wrap img {
    transform: scale(1.08);
}

/* 播放按钮 - JS/CSS实现 */
.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;
}

.video-card:hover .play-overlay {
    background: rgba(0,0,0,0.25);
}

.play-btn-circle {
    width: 56px;
    height: 56px;
    background: rgba(255,255,255,0.92);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transform: scale(0.7);
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

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

.play-btn-circle::after {
    content: '';
    display: block;
    width: 0;
    height: 0;
    border-top: 11px solid transparent;
    border-bottom: 11px solid transparent;
    border-left: 18px solid var(--primary);
    margin-left: 4px;
}

/* 视频时长标签 */
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.7);
    color: #fff;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

/* 热度标签 */
.video-hot {
    position: absolute;
    top: 8px;
    left: 8px;
    background: var(--gradient-main);
    color: #fff;
    font-size: 11px;
    padding: 3px 10px;
    border-radius: 10px;
    font-weight: 700;
}

.video-info {
    padding: 16px;
}

.video-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 10px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.5;
}

.video-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 12px;
    color: var(--text-gray);
}

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

/* ---- 社区模块 ---- */
.community-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.community-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    border: 1px solid rgba(255, 107, 129, 0.1);
}

.community-card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--neon-pink);
}

.community-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-main);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 28px;
}

.community-card h3 {
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.community-card p {
    font-size: 14px;
    color: var(--text-gray);
    margin-bottom: 24px;
    line-height: 1.7;
}

/* ---- AI模块 ---- */
.ai-section {
    background: linear-gradient(135deg, #0f0f1a, #1a1a2e);
    color: #fff;
    position: relative;
    overflow: hidden;
}

.ai-section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(255,107,129,0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 50%, rgba(112,161,255,0.15) 0%, transparent 50%);
}

.ai-section .section-title { color: #fff; }
.ai-section .section-desc { color: rgba(255,255,255,0.6); }

.ai-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 20px;
    position: relative;
    z-index: 1;
}

.ai-tool-card {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
}

.ai-tool-card:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255, 107, 129, 0.5);
    transform: translateY(-4px);
    box-shadow: var(--neon-pink);
}

.ai-tool-icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
}

.ai-tool-card h4 {
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}

.ai-tool-card p {
    font-size: 13px;
    color: rgba(255,255,255,0.6);
    line-height: 1.6;
}

/* ---- 专家模块 ---- */
.experts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 24px;
}

.expert-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.expert-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(112, 161, 255, 0.2);
}

.expert-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--gradient-main);
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: #fff;
    font-weight: 900;
}

.expert-card h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 6px;
}

.expert-card .role {
    font-size: 13px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 8px;
}

.expert-card p {
    font-size: 13px;
    color: var(--text-gray);
    line-height: 1.6;
}

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

.review-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 28px 24px;
    box-shadow: var(--card-shadow);
    position: relative;
    transition: var(--transition);
    border-left: 4px solid var(--primary);
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px rgba(255, 107, 129, 0.15);
}

.review-stars {
    color: #ffa502;
    font-size: 18px;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.review-text {
    font-size: 14px;
    color: var(--text-dark);
    line-height: 1.8;
    margin-bottom: 16px;
    font-style: italic;
}

.review-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-main);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 14px;
}

.review-name {
    font-size: 14px;
    font-weight: 700;
    color: var(--text-dark);
}

.review-date {
    font-size: 12px;
    color: var(--text-gray);
}

/* ---- 合作伙伴 ---- */
.partners-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    align-items: center;
}

.partner-logo {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 16px 28px;
    box-shadow: var(--card-shadow);
    font-size: 15px;
    font-weight: 700;
    color: var(--text-gray);
    transition: var(--transition);
}

.partner-logo:hover {
    color: var(--primary);
    transform: scale(1.05);
    box-shadow: var(--neon-pink);
}

/* ---- FAQ ---- */
.faq-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(520px, 1fr));
    gap: 16px;
}

.faq-item {
    background: var(--bg-white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--card-shadow);
    border: 1px solid rgba(255, 107, 129, 0.1);
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-q {
    font-size: 15px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}

.faq-q::before {
    content: 'Q';
    background: var(--gradient-main);
    color: #fff;
    width: 22px;
    height: 22px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 900;
    flex-shrink: 0;
    margin-top: 1px;
}

.faq-a {
    font-size: 14px;
    color: var(--text-gray);
    line-height: 1.8;
    padding-left: 30px;
}

/* ---- 联系模块 ---- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.contact-card {
    background: var(--bg-white);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
}

.contact-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

.contact-card h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-gray);
}

/* ---- 统计数字 ---- */
.stats-bar {
    background: var(--gradient-main);
    padding: 40px 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1280px;
    margin: 0 auto;
    text-align: center;
    color: #fff;
}

.stat-num {
    font-size: 40px;
    font-weight: 900;
    line-height: 1;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    opacity: 0.85;
}

/* ---- 页脚 ---- */
footer {
    background: #0f0f1a;
    color: rgba(255,255,255,0.8);
    padding: 60px 24px 24px;
    position: relative;
    z-index: 1;
}

.footer-grid {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo {
    display: block;
    font-size: 26px;
    margin-bottom: 16px;
}

.footer-brand p {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    line-height: 1.8;
    margin-bottom: 8px;
}

.footer-col h5 {
    font-size: 15px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    color: rgba(255,255,255,0.5);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 10px;
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
}

.footer-bottom {
    max-width: 1280px;
    margin: 24px auto 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

.footer-qr {
    text-align: center;
}

.footer-qr img {
    border-radius: 8px;
    margin-bottom: 8px;
    border: 2px solid rgba(255,255,255,0.1);
}

.footer-qr p {
    font-size: 12px;
    color: rgba(255,255,255,0.5);
}

/* ---- 内页Banner ---- */
.inner-hero {
    padding: 120px 24px 60px;
    background: var(--gradient-bg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.inner-hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(255,107,129,0.15) 0%, transparent 60%);
}

.inner-hero h1 {
    font-size: clamp(28px, 5vw, 52px);
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
    position: relative;
}

.inner-hero p {
    font-size: 16px;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto;
    position: relative;
}

/* ---- 面包屑 ---- */
.breadcrumb {
    padding: 12px 24px;
    max-width: 1280px;
    margin: 0 auto;
    font-size: 13px;
    color: var(--text-gray);
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

.breadcrumb span { margin: 0 8px; }

/* ---- 标签 ---- */
.tag {
    display: inline-block;
    padding: 3px 10px;
    background: rgba(255, 107, 129, 0.1);
    color: var(--primary);
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
    margin: 2px;
}

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

@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 32px; }
    .hero-actions { flex-direction: column; align-items: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .community-grid { grid-template-columns: 1fr; }
    .video-grid { grid-template-columns: 1fr; }
    .section { padding: 48px 16px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .stat-num { font-size: 28px; }
}