* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --primary: #165DFF;
    --primary-light: #E8F3FF;
    --primary-dark: #0E42C0;
    --accent-blue: #4080ff;
    --accent-blue-light: #52a6ff;
    --bg-white: #ffffff;
    --bg-light: #F5F7FA;
    --bg-gray: #e8ebf0;
    --bg-card: #ffffff;
    --gray-dark: #1D2129;
    --gray-text: #4E5969;
    --gray-light: #8696a6;
    --text-primary: #1D2129;
    --text-secondary: #4E5969;
    --text-light: #8696a6;
    --border-color: #e8ebf0;
    --border-light: #F5F7FA;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 8px 32px rgba(22, 93, 255, 0.15);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
body {
    font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}
.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
}
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent-blue-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}
.logo-icon {
    font-size: 1.8rem;
}
.nav-links {
    display: flex;
    gap: 16px;
    align-items: center;
    flex-wrap: wrap;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-smooth);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    white-space: nowrap;
}
.nav-links a:hover {
    color: var(--primary);
    background: var(--primary-light);
}
.nav-links a.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 600;
}
.hero-cta-group {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    justify-content: center;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-smooth);
    border: 1px solid transparent;
    white-space: nowrap;
}
.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    border-radius: 50px;
    box-shadow: 0 4px 16px rgba(31, 88, 212, 0.3);
}
.btn-primary:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-2px);
}
.btn-glass {
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.btn-glass:hover {
    background: #fff;
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.btn-outline-gold {
    border: 1px solid var(--primary);
    color: var(--primary);
    background: transparent;
}
.btn-outline-gold:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    transform: translateY(-2px);
}
.hero {
    padding: 80px 0 60px;
    text-align: center;
    position: relative;
    background: linear-gradient(180deg, var(--bg-white) 0%, var(--bg-light) 100%);
}
.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    color: var(--gray-dark);
    margin-bottom: 24px;
    line-height: 1.2;
}
.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 36px;
}
.hero-badge {
    display: inline-block;
    background: var(--primary-light);
    border: 1px solid rgba(22, 93, 255, 0.2);
    border-radius: 30px;
    padding: 8px 22px;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 24px;
    font-size: 0.9rem;
}
.section-title {
    text-align: center;
    margin-bottom: 40px;
    padding-top: 40px;
}
.section-title h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-dark);
    margin-bottom: 12px;
}
.section-title .sub {
    color: var(--primary);
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    font-size: 0.85rem;
}
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 50px;
}
.video-card {
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-smooth);
    background: var(--bg-white);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}
.video-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.video-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}
.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}
.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}
.video-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 50px;
    height: 50px;
    background: rgba(22, 93, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    transition: all var(--transition-smooth);
}
.video-card:hover .video-overlay {
    background: var(--primary);
    transform: translate(-50%, -50%) scale(1.1);
}
.video-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: center;
    padding: 12px 16px;
}
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 50px;
}
.card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    transition: all var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}
.card:hover {
    transform: translateY(-6px);
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
}
.card h3 {
    font-size: 1.2rem;
    margin: 14px 0 10px;
    color: var(--gray-dark);
    font-weight: 700;
}
.card .tag {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 20px;
    margin-bottom: 10px;
}
.card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 12px;
}
.card-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    margin-bottom: 16px;
}
.card-icon.blue {
    background: rgba(22, 93, 255, 0.15);
    color: var(--primary);
}
.card-icon.teal {
    background: rgba(77, 201, 192, 0.15);
    color: #4dc9c0;
}
.card-icon.gold {
    background: rgba(201, 169, 110, 0.15);
    color: #c9a96e;
}
.card-icon.rose {
    background: rgba(224, 138, 170, 0.15);
    color: #e08aaa;
}
.card-icon.purple {
    background: rgba(139, 124, 240, 0.15);
    color: #8b7cf0;
}
.card-btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}
.card-btn-row .btn {
    padding: 8px 16px;
    font-size: 0.85rem;
}
.card ul {
    list-style: none;
    margin-top: 14px;
    color: var(--text-secondary);
}
.card ul li {
    padding: 6px 0;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
}
.card ul li:last-child {
    border-bottom: none;
}
.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 50px;
}
.chapter-card {
    background: var(--bg-white);
    border: 1px solid var(--border-light);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    transition: all var(--transition-smooth);
    box-shadow: var(--shadow-sm);
}
.chapter-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-left-color: var(--primary-dark);
}
.chapter-card h3 {
    font-size: 1.3rem;
    color: var(--gray-dark);
    margin-bottom: 8px;
    font-weight: 700;
}
.chapter-card .subtitle {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 14px;
    font-size: 0.95rem;
}
.chapter-card p, .chapter-card li {
    color: var(--text-secondary);
    font-size: 0.92rem;
}
.tools-strip {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 14px;
    margin: 30px 0 50px;
}
.tool-item {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 40px;
    padding: 10px 20px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-smooth);
}
.tool-item:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-light);
}
.matrix-table {
    overflow-x: auto;
    margin-bottom: 50px;
    border-radius: var(--radius-md);
    background: var(--bg-white);
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
table {
    width: 100%;
    border-collapse: collapse;
    color: var(--text-secondary);
}
th {
    text-align: left;
    padding: 14px 12px;
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 700;
    border-bottom: 2px solid var(--border-color);
    font-size: 0.9rem;
}
td {
    padding: 12px;
    border-bottom: 1px solid var(--border-light);
    font-size: 0.9rem;
}
tr:last-child td {
    border-bottom: none;
}
tr:hover td {
    background: var(--bg-light);
}
.quote-box {
    text-align: center;
    padding: 50px 30px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    margin-bottom: 50px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
.quote-box blockquote {
    font-size: 1.4rem;
    font-style: italic;
    color: var(--gray-dark);
    max-width: 700px;
    margin: 0 auto 20px;
    line-height: 1.6;
}
.quote-box cite {
    color: var(--primary);
    font-weight: 700;
}
footer {
    padding: 40px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
    background: var(--bg-white);
}
.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 16px;
}
.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-smooth);
    font-weight: 500;
}
.footer-links a:hover {
    color: var(--primary);
}
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }
    .nav-links {
        gap: 10px;
    }
    .nav-links a:not(.btn-primary) {
        display: none;
    }
    .section-title h2 {
        font-size: 1.6rem;
    }
    .chapter-card {
        padding: 22px 18px;
    }
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}
.contact-section {
    padding: 50px 0;
    background: var(--bg-white);
}
.contact-section .container {
    position: relative;
    z-index: 1;
    text-align: center;
}
.contact-section p {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 24px;
}
.contact-section .highlight {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}
.contact-section .highlight-name {
    color: var(--primary);
    font-weight: 700;
}
.contact-buttons {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}
.contact-btn {
    background: var(--bg-white);
    border: 1px solid var(--primary);
    color: var(--primary);
    padding: 12px 28px;
    border-radius: 50px;
    text-decoration: none !important;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all var(--transition-smooth);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
}
.contact-btn:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(22, 93, 255, 0.3);
}