/* ========================================
   糖心 - 原创CSS样式表
   配色：樱花粉 #FF6B8A + 天空蓝 #4FC3F7 + 暖白 #FFF9FB
   字体：系统中文字体栈
   ======================================== */

/* --- CSS Variables --- */
:root {
    --primary: #FF6B8A;
    --primary-dark: #E8527A;
    --primary-light: #FFB3C6;
    --secondary: #4FC3F7;
    --secondary-dark: #0399E5;
    --secondary-light: #B3E5FC;
    --accent: #FFD54F;
    --bg-main: #FFF9FB;
    --bg-card: #FFFFFF;
    --bg-section: #F5F0F3;
    --bg-dark: #2D1B2E;
    --text-primary: #3D2040;
    --text-secondary: #6B4D6E;
    --text-light: #9B7F9E;
    --text-white: #FFFFFF;
    --border: #F0D4E0;
    --shadow: rgba(255, 107, 138, 0.12);
    --shadow-hover: rgba(255, 107, 138, 0.25);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1280px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* --- Header & Navigation --- */
.site-header {
    background: rgba(255, 249, 251, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 0 24px;
}
.header-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo-link { display: flex; align-items: center; gap: 10px; }
.logo-link img { height: 44px; width: auto; }
.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.main-nav { display: flex; align-items: center; gap: 8px; }
.main-nav a {
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 8px;
    transition: var(--transition);
}
.main-nav a:hover, .main-nav a.active {
    background: var(--primary);
    color: var(--text-white);
}
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-primary);
    cursor: pointer;
    padding: 8px;
}

/* --- Search Bar --- */
.search-bar {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    padding: 16px 0;
}
.search-bar .container { display: flex; justify-content: center; }
.search-wrapper {
    display: flex;
    max-width: 600px;
    width: 100%;
    background: var(--bg-card);
    border-radius: 50px;
    overflow: hidden;
    box-shadow: 0 4px 20px var(--shadow);
}
.search-wrapper input {
    flex: 1;
    border: none;
    padding: 14px 24px;
    font-size: 1rem;
    outline: none;
    background: transparent;
    color: var(--text-primary);
}
.search-wrapper input::placeholder { color: var(--text-light); }
.search-wrapper button {
    background: var(--primary);
    color: var(--text-white);
    border: none;
    padding: 14px 28px;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
}
.search-wrapper button:hover { background: var(--primary-dark); }

/* --- Breadcrumb --- */
.breadcrumb {
    padding: 14px 0;
    font-size: 0.88rem;
    color: var(--text-light);
}
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { margin: 0 6px; }

/* --- Hero Section --- */
.hero-section {
    background: linear-gradient(135deg, #FFE8EE 0%, #E3F2FD 50%, #FFF3E0 100%);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}
.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255,107,138,0.15), transparent 70%);
    border-radius: 50%;
}
.hero-section::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(79,195,247,0.15), transparent 70%);
    border-radius: 50%;
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.hero-content h1 {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-content .subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 36px;
    line-height: 1.8;
}
.hero-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-bottom: 36px; }
.hero-tags span {
    background: rgba(255,255,255,0.8);
    color: var(--text-secondary);
    padding: 6px 18px;
    border-radius: 20px;
    font-size: 0.9rem;
    border: 1px solid var(--border);
}
.hero-btns { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-decoration: none;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--text-white);
    box-shadow: 0 4px 20px rgba(255,107,138,0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(255,107,138,0.45); color: var(--text-white); }
.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--text-white); }

/* --- Section Common --- */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-section); }
.section-title {
    text-align: center;
    margin-bottom: 48px;
}
.section-title h2 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin-bottom: 12px;
}
.section-title p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* --- Video Card Grid --- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.video-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
    position: relative;
}
.video-card:hover { transform: translateY(-6px); box-shadow: 0 12px 36px var(--shadow-hover); }
.video-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}
.video-thumb img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.video-card:hover .video-thumb img { transform: scale(1.08); }
.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    width: 56px;
    height: 56px;
    background: rgba(255,107,138,0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.play-btn::after {
    content: '';
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 10px 0 10px 18px;
    border-color: transparent transparent transparent white;
    margin-left: 3px;
}
.video-card:hover .play-btn { transform: translate(-50%, -50%) scale(1); }
.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background: rgba(0,0,0,0.75);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.8rem;
}
.video-info { padding: 14px 16px; }
.video-info h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.82rem;
    color: var(--text-light);
}
.video-meta span { display: flex; align-items: center; gap: 4px; }
.video-tags { display: flex; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.video-tags span {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.75rem;
}

/* --- Service Cards --- */
.service-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.service-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    text-align: center;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
    border: 1px solid transparent;
}
.service-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary-light);
    box-shadow: 0 12px 40px var(--shadow-hover);
}
.service-icon {
    width: 72px;
    height: 72px;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 20px;
}
.service-icon.pink { background: linear-gradient(135deg, #FFE8EE, #FFB3C6); }
.service-icon.blue { background: linear-gradient(135deg, #E3F2FD, #B3E5FC); }
.service-icon.yellow { background: linear-gradient(135deg, #FFF8E1, #FFE082); }
.service-icon.green { background: linear-gradient(135deg, #E8F5E9, #A5D6A7); }
.service-icon.purple { background: linear-gradient(135deg, #F3E5F5, #CE93D8); }
.service-icon.orange { background: linear-gradient(135deg, #FFF3E0, #FFB74D); }
.service-card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 10px; color: var(--text-primary); }
.service-card p { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.7; }

/* --- Expert Cards --- */
.expert-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.expert-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 32px 20px;
    text-align: center;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
}
.expert-card:hover { transform: translateY(-4px); box-shadow: 0 12px 36px var(--shadow-hover); }
.expert-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    object-fit: cover;
    margin: 0 auto 16px;
    border: 3px solid var(--primary-light);
}
.expert-card h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
.expert-role { color: var(--primary); font-size: 0.88rem; font-weight: 500; margin-bottom: 10px; }
.expert-desc { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; }
.expert-btns { display: flex; justify-content: center; gap: 8px; }
.btn-sm {
    padding: 6px 16px;
    font-size: 0.82rem;
    border-radius: 20px;
    font-weight: 500;
}

/* --- FAQ Section --- */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    margin-bottom: 12px;
    box-shadow: 0 2px 8px var(--shadow);
    overflow: hidden;
}
.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
    font-size: 1rem;
}
.faq-question:hover { color: var(--primary); }
.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--primary);
    transition: var(--transition);
}
.faq-item.active .faq-question::after { content: '-'; }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
}
.faq-item.active .faq-answer { max-height: 300px; padding-bottom: 20px; }

/* --- Reviews --- */
.review-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.review-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: 0 2px 12px var(--shadow);
    transition: var(--transition);
}
.review-card:hover { transform: translateY(-3px); box-shadow: 0 8px 30px var(--shadow-hover); }
.review-stars { color: var(--accent); font-size: 1.1rem; margin-bottom: 12px; letter-spacing: 2px; }
.review-text { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; font-style: italic; }
.review-author { display: flex; align-items: center; gap: 12px; }
.review-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary-light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--primary-dark);
    font-size: 1.1rem;
}
.review-name { font-weight: 600; font-size: 0.92rem; }
.review-date { font-size: 0.8rem; color: var(--text-light); }

/* --- How-To Section --- */
.howto-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}
.howto-step {
    text-align: center;
    padding: 28px 20px;
    position: relative;
}
.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    font-size: 1.5rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
}
.howto-step h4 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.howto-step p { font-size: 0.88rem; color: var(--text-secondary); }

/* --- Contact Section --- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 36px;
    align-items: start;
}
.contact-info-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: 0 2px 12px var(--shadow);
}
.contact-info-card h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
.contact-item { display: flex; align-items: flex-start; gap: 14px; margin-bottom: 18px; }
.contact-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
}
.contact-item p { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; }
.contact-item strong { color: var(--text-primary); }
.qrcode-grid { display: flex; gap: 24px; margin-top: 20px; }
.qrcode-item { text-align: center; }
.qrcode-item img { width: 140px; height: 140px; border-radius: var(--radius); margin-bottom: 8px; }
.qrcode-item p { font-size: 0.85rem; color: var(--text-secondary); }

/* --- Partner Logos --- */
.partner-wall {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 32px;
    padding: 20px 0;
}
.partner-logo {
    width: 120px;
    height: 60px;
    background: var(--bg-card);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px var(--shadow);
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.85rem;
    transition: var(--transition);
}
.partner-logo:hover { box-shadow: 0 4px 16px var(--shadow-hover); color: var(--primary); }

/* --- Social Share --- */
.share-bar {
    display: flex;
    justify-content: center;
    gap: 16px;
    padding: 24px 0;
}
.share-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: white;
    transition: var(--transition);
    cursor: pointer;
}
.share-btn:hover { transform: translateY(-3px); }
.share-wechat { background: #07C160; }
.share-weibo { background: #E6162D; }
.share-douyin { background: #161823; }
.share-bilibili { background: #00A1D6; }

/* --- Footer --- */
.site-footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand .logo-text { font-size: 1.8rem; margin-bottom: 12px; display: block; }
.footer-brand p { font-size: 0.92rem; line-height: 1.7; margin-bottom: 16px; }
.footer-col h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 16px;
}
.footer-col a {
    display: block;
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    padding: 4px 0;
    transition: var(--transition);
}
.footer-col a:hover { color: var(--primary-light); padding-left: 6px; }
.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}
.footer-bottom a { color: var(--primary-light); }

/* --- MCP Service Widget --- */
.mcp-widget {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 999;
}
.mcp-btn {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(255,107,138,0.4);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
.mcp-btn:hover { transform: scale(1.1); }
.mcp-panel {
    display: none;
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 320px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 40px rgba(0,0,0,0.15);
    padding: 24px;
}
.mcp-panel.active { display: block; }
.mcp-panel h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 12px; }
.mcp-panel p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 16px; }
.mcp-panel input {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 12px;
    font-size: 0.9rem;
    outline: none;
}
.mcp-panel input:focus { border-color: var(--primary); }

/* --- Responsive --- */
@media (max-width: 1024px) {
    .video-grid { grid-template-columns: repeat(3, 1fr); }
    .expert-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .main-nav { display: none; position: absolute; top: 72px; left: 0; right: 0; background: var(--bg-card); flex-direction: column; padding: 16px; box-shadow: 0 8px 30px var(--shadow); }
    .main-nav.active { display: flex; }
    .mobile-toggle { display: block; }
    .hero-content h1 { font-size: 2rem; }
    .hero-content .subtitle { font-size: 1rem; }
    .video-grid { grid-template-columns: repeat(2, 1fr); }
    .service-grid { grid-template-columns: 1fr; }
    .expert-grid { grid-template-columns: 1fr; }
    .review-grid { grid-template-columns: 1fr; }
    .howto-steps { grid-template-columns: repeat(2, 1fr); }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .section { padding: 48px 0; }
}
@media (max-width: 480px) {
    .video-grid { grid-template-columns: 1fr; }
    .howto-steps { grid-template-columns: 1fr; }
    .hero-btns { flex-direction: column; align-items: center; }
}

/* --- Image Load Animation --- */
img { opacity: 1; transition: opacity 0.3s ease; }

/* --- Animations --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-in { animation: fadeInUp 0.6s ease forwards; }

/* --- Inner Page Specific --- */
.page-hero {
    background: linear-gradient(135deg, #FFE8EE, #E3F2FD);
    padding: 48px 0;
    text-align: center;
}
.page-hero h1 { font-size: 2.2rem; font-weight: 800; margin-bottom: 12px; }
.page-hero p { color: var(--text-secondary); font-size: 1.05rem; }
.content-section { padding: 48px 0; }
.content-section h2 { font-size: 1.6rem; font-weight: 700; margin-bottom: 20px; color: var(--text-primary); }
.content-section p { margin-bottom: 16px; color: var(--text-secondary); line-height: 1.8; }