/* 官网首页样式 */
.intro-official { font-family: "Microsoft YaHei", "PingFang SC", sans-serif; }
.intro-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: 64px;
    background: rgba(255,255,255,0.98);
    box-shadow: 0 1px 10px rgba(0,0,0,0.08);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 8%;
}
.intro-nav .nav-logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: #1a1a2e;
    font-size: 22px;
    font-weight: bold;
}
.intro-nav .nav-logo img { height: 40px; margin-right: 10px; }
.intro-nav .nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
    margin: 0;
    padding: 0;
}
.intro-nav .nav-menu a {
    padding: 8px 18px;
    color: #444;
    text-decoration: none;
    font-size: 15px;
    border-radius: 8px;
    transition: color 0.2s, background 0.2s;
}
.intro-nav .nav-menu a:hover { color: #667eea; background: #f0f0ff; }
.intro-nav .nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}
.intro-nav .nav-right .btn-login {
    color: #667eea;
    text-decoration: none;
    padding: 8px 20px;
    font-size: 15px;
    border-radius: 8px;
    transition: background 0.2s, color 0.2s;
}
.intro-nav .nav-right .btn-login:hover { background: #f0f0ff; color: #5568d3; }
.intro-nav .nav-right .btn-register {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-decoration: none;
    padding: 10px 24px;
    font-size: 15px;
    border-radius: 8px;
    transition: transform 0.2s, box-shadow 0.2s;
}
.intro-nav .nav-right .btn-register:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    color: #fff;
}
.intro-nav .nav-right .user-dropdown {
    position: relative;
    display: inline-block;
}
.intro-nav .nav-right .user-dropdown .user-trigger {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    color: #667eea;
    text-decoration: none;
    font-size: 15px;
    border-radius: 8px;
    background: #f0f0ff;
    cursor: pointer;
}
.intro-nav .nav-right .user-dropdown .user-trigger:hover { background: #e8e8ff; color: #5568d3; }
.intro-nav .nav-right .user-dropdown .dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 8px;
    min-width: 180px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.12);
    padding: 8px 0;
    list-style: none;
    display: none;
}
.intro-nav .nav-right .user-dropdown:hover .dropdown-menu { display: block; }
.intro-nav .nav-right .user-dropdown .dropdown-menu a {
    display: block;
    padding: 10px 20px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    transition: background 0.2s;
}
.intro-nav .nav-right .user-dropdown .dropdown-menu a:hover { background: #f5f5f5; }
.intro-nav .nav-right .user-dropdown .dropdown-menu .divider {
    height: 1px;
    background: #eee;
    margin: 6px 0;
}

.hero {
    padding: 140px 8% 100px;
    background: linear-gradient(160deg, #667eea 0%, #764ba2 50%, #1a1a2e 100%);
    color: #fff;
    text-align: center;
}
.hero h1 { font-size: 48px; margin-bottom: 24px; font-weight: 700; letter-spacing: 1px; }
.hero .hero-desc { font-size: 20px; opacity: 0.95; max-width: 640px; margin: 0 auto 40px; line-height: 1.7; }
.hero .hero-btns { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; }
.hero .hero-btns a {
    display: inline-block;
    padding: 16px 36px;
    font-size: 17px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}
.hero .hero-btns .btn-primary {
    background: #fff;
    color: #667eea;
}
.hero .hero-btns .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    color: #5568d3;
}
.hero .hero-btns .btn-outline {
    background: transparent;
    color: #fff;
    border: 2px solid rgba(255,255,255,0.8);
}
.hero .hero-btns .btn-outline:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-2px);
    color: #fff;
}

.section { padding: 80px 8%; max-width: 1200px; margin: 0 auto; }
.section-title { text-align: center; margin-bottom: 50px; }
.section-title h2 { font-size: 36px; color: #1a1a2e; margin-bottom: 16px; font-weight: 700; }
.section-title p { font-size: 17px; color: #666; line-height: 1.6; }

.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
    margin: 0;
}
.feature-card {
    padding: 40px 32px;
    background: #fff;
    border-radius: 16px;
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid #eee;
}
.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(102, 126, 234, 0.15);
    border-color: transparent;
}
.feature-icon { font-size: 52px; color: #667eea; margin-bottom: 24px; }
.feature-card h3 { font-size: 22px; color: #1a1a2e; margin-bottom: 14px; font-weight: 600; }
.feature-card p { color: #666; line-height: 1.7; font-size: 15px; }

.stats-row {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 70px 8%;
    display: flex;
    justify-content: center;
    gap: 60px;
    flex-wrap: wrap;
    color: #fff;
}
.stat-item { text-align: center; }
.stat-item .num { font-size: 42px; font-weight: 700; margin-bottom: 8px; }
.stat-item .label { font-size: 16px; opacity: 0.9; }

.steps-section { background: #f8f9fa; }
.steps-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 40px;
    margin-top: 40px;
}
.step-card {
    background: #fff;
    padding: 36px 28px;
    border-radius: 14px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
    transition: box-shadow 0.3s;
}
.step-card:hover { box-shadow: 0 12px 40px rgba(0,0,0,0.1); }
.step-card .step-num {
    width: 56px;
    height: 56px;
    line-height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 20px;
}
.step-card h3 { font-size: 20px; color: #1a1a2e; margin-bottom: 12px; }
.step-card p { color: #666; line-height: 1.6; font-size: 15px; }

.cta-section {
    padding: 90px 8%;
    text-align: center;
    background: linear-gradient(160deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
}
.cta-section h2 { font-size: 36px; margin-bottom: 20px; font-weight: 700; }
.cta-section p { font-size: 18px; opacity: 0.9; margin-bottom: 36px; }
.cta-section a {
    display: inline-block;
    padding: 16px 40px;
    font-size: 17px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
}
.cta-section a:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    color: #fff;
}

.intro-footer {
    padding: 40px 8%;
    text-align: center;
    background: #0f0f1a;
    color: #999;
    font-size: 14px;
}
.intro-footer a { color: #667eea; text-decoration: none; }
.intro-footer a:hover { text-decoration: underline; }

@media (max-width: 992px) {
    .intro-nav { padding: 0 4%; flex-wrap: wrap; height: auto; min-height: 64px; padding-top: 12px; padding-bottom: 12px; }
    .intro-nav .nav-menu { order: 3; width: 100%; justify-content: center; margin-top: 12px; gap: 4px; }
    .intro-nav .nav-menu a { padding: 6px 12px; font-size: 14px; }
    .hero { padding: 120px 4% 80px; }
    .hero h1 { font-size: 32px; }
    .hero .hero-desc { font-size: 16px; }
    .section { padding: 60px 4%; }
    .section-title h2 { font-size: 28px; }
    .stats-row { gap: 30px; padding: 50px 4%; }
    .stat-item .num { font-size: 32px; }
}