:root {
    --primary-color: #667eea;
    --primary-hover: #5a67d8;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --border-color: #e5e7eb;
    --card-shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
    --card-hover-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 10px 10px -5px rgba(0,0,0,0.04);
}

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

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
}

/* ========== 加载动画 ========== */
.loader-fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s, visibility 0.5s;
}

.loader-fullscreen.hide {
    opacity: 0;
    visibility: hidden;
}

.loader-content {
    text-align: center;
}

.loader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}





/* 响应式 */
@media (max-width: 768px) {
    .capability-card.active {
        flex-direction: column;
        gap: 24px;
        padding: 24px;
    }

    .cap-steps {
        flex: 0 0 auto;
        width: 100%;
    }

    .capability-tabs {
        flex-direction: column;
        align-items: stretch;
    }

    .cap-tab {
        justify-content: center;
    }

    .capabilities {
        margin-top: -40px;
    }
}
.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 100px 20px 140px;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    padding: 6px 20px;
    border-radius: 40px;
    color: white;
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 24px;
    border: 1px solid rgba(255,255,255,0.3);
}

.hero-icon-wrap {
    margin-bottom: 32px;
}

.hero-logo {
    height: 80px;
    filter: drop-shadow(0 8px 20px rgba(0,0,0,0.2));
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.gradient-text {
    background: linear-gradient(135deg, #fff 0%, #f0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: rgba(255,255,255,0.9);
    margin-bottom: 36px;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.hero-feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    font-size: 15px;
    font-weight: 500;
    background: rgba(255,255,255,0.15);
    padding: 10px 24px;
    border-radius: 40px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s;
}

.hero-feature-item:hover {
    background: rgba(255,255,255,0.25);
    transform: translateY(-2px);
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 40px;
    border-radius: 60px;
    font-size: 18px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

.hero-btn i {
    font-size: 24px;
}

.hero-btn-primary {
    background: white;
    color: var(--primary-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.hero-btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.hero-btn-outline {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 2px solid rgba(255,255,255,0.3);
    backdrop-filter: blur(10px);
}

.hero-btn-outline:hover {
    background: rgba(255,255,255,0.2);
    border-color: rgba(255,255,255,0.5);
    transform: translateY(-3px);
}

.hero-wave {
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    z-index: 2;
}

/* ========== 统计区域 ========== */
.stats-section {
    background: var(--bg-secondary);
    padding: 80px 20px;
}

.stats-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.stat-card {
    background: var(--bg-primary);
    border-radius: 20px;
    padding: 40px 24px;
    text-align: center;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.stat-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-hover-shadow);
}

.stat-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon i {
    font-size: 32px;
}

.stat-number {
    font-size: 48px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 12px;
}

.stat-label {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ========== 功能卡片 ========== */
.features-section {
    max-width: 1200px;
    margin: 80px auto;
    padding: 0 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    background: linear-gradient(135deg, rgba(102,126,234,0.1), rgba(118,75,162,0.1));
    color: var(--primary-color);
    padding: 6px 20px;
    border-radius: 40px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-desc {
    color: var(--text-secondary);
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-primary);
    border-radius: 24px;
    padding: 40px 28px;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--gradient-end));
    opacity: 0;
    transition: opacity 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--card-hover-shadow);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 24px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-card h3 {
    font-size: 22px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 15px;
}

/* ========== CTA 区域 ========== */
.cta-section {
    text-align: center;
    padding: 80px 40px;
    background: linear-gradient(135deg, rgba(102,126,234,0.05), rgba(118,75,162,0.05));
    border-radius: 40px;
    margin: 60px 20px;
    border: 1px solid var(--border-color);
}

.cta-section h2 {
    font-size: 40px;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 36px;
    font-size: 18px;
}

.btn-group {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 16px 40px;
    border-radius: 60px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 10px;
}

.btn i {
    font-size: 20px;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(102,126,234,0.4);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(102,126,234,0.5);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-3px);
}

/* ========== FAQ ========== */
.faq-section {
    max-width: 900px;
    margin: 80px auto;
    padding: 0 20px;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.faq-item {
    background: var(--bg-primary);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all 0.3s;
}

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

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-primary);
    transition: background 0.3s;
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-icon {
    transition: transform 0.3s;
    color: var(--primary-color);
    font-size: 20px;
}

.faq-question.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    color: var(--text-secondary);
    line-height: 1.7;
    border-top: 1px solid transparent;
}

.faq-answer.show {
    padding: 20px 24px;
    max-height: 300px;
    border-top-color: var(--border-color);
}

/* ========== 页脚 ========== */


.site-footer p {
    color: var(--text-secondary);
    font-size: 14px;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

/* ========== 响应式 ========== */
@media (max-width: 992px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero-title { font-size: 36px; }
    .hero-subtitle { font-size: 16px; }
    .hero-content { padding: 80px 20px 120px; }
    .hero-btn { padding: 14px 28px; font-size: 16px; }
    .hero-logo { height: 56px; }
    .features-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .section-title { font-size: 30px; }
    .stat-number { font-size: 40px; }
    .cta-section { padding: 60px 20px; margin: 40px 20px; }
    .cta-section h2 { font-size: 28px; }
    .faq-grid { grid-template-columns: 1fr; }

    .navbar-toggler { display: block; }
    .navbar-nav {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #fff;
        padding: 16px;
        box-shadow: var(--card-shadow);
        gap: 4px;
    }
    .navbar-nav.open { display: flex; }
    .navbar-nav .nav-link { color: var(--text-primary); padding: 12px 16px; }
    .navbar-nav .nav-link:hover { background: rgba(102,126,234,0.1); color: var(--primary-color); }
}
/* ========== 导航栏（新版） ========== */
.front-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 30px;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.logo-area .logo {
    height: 40px;
    width: auto;
}

.nav {
    display: flex;
    gap: 5px;
    align-items: center;
}

.nav-item {
    position: relative;
    display: inline-block;
}

.nav-link {
    display: block;
    padding: 10px 16px;
    text-decoration: none;
    color: #6b7280;
    border-radius: 8px;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 14px;
}

.nav-link:hover {
    background: #f3f4f6;
    color: var(--primary-color);
}

.nav-item.has-dropdown > .nav-link::after {
    content: '▾';
    font-size: 10px;
    margin-left: 6px;
    opacity: 0.5;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 150px;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.25s ease;
    z-index: 9999;
    padding: 8px 0;
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    display: block;
    padding: 10px 20px;
    text-decoration: none;
    color: #6b7280;
    font-size: 14px;
    transition: all 0.2s;
}

.dropdown-menu a:hover {
    background: #f3f4f6;
    color: var(--primary-color);
}

/* 用户菜单 */
.user-menu {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 18px;
    border-radius: 30px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--primary-hover);
    color: white;
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--border-color);
    color: #6b7280;
}

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

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

/* 移动端菜单 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #6b7280;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    background: #fff;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    z-index: 999;
    flex-direction: column;
    padding: 10px 0;
    max-height: calc(100vh - 70px);
    overflow-y: auto;
}

.mobile-menu.show {
    display: flex;
}

.mobile-nav-link {
    padding: 14px 20px;
    display: block;
    text-decoration: none;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.mobile-user-card {
    padding: 16px 20px;
    background: #f9fafb;
}

.mobile-user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-user-name {
    font-weight: 600;
}

.mobile-user-actions {
    display: flex;
    gap: 10px;
    margin-top: 12px;
}

.mobile-user-btn {
    flex: 1;
    text-align: center;
    padding: 10px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
}

.mobile-user-btn-primary {
    background: var(--primary-color);
    color: white;
}

.mobile-user-btn-outline {
    border: 1.5px solid var(--border-color);
    color: var(--text-primary);
}

.mobile-menu-divider {
    height: 8px;
    background: #f3f4f6;
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.mobile-has-dropdown > .mobile-nav-link::after {
    content: '▾';
    font-size: 10px;
    margin-left: 8px;
    float: right;
}

.mobile-dropdown {
    display: none;
    background: #f9fafb;
    padding-left: 20px;
}

.mobile-dropdown.show {
    display: block;
}

.mobile-dropdown a {
    padding: 12px 20px;
    display: block;
    text-decoration: none;
    color: #6b7280;
    font-size: 14px;
    border-bottom: 1px solid var(--border-color);
}

/* 响应式 */
@media (max-width: 768px) {
    .front-header {
        padding: 10px 15px;
    }

    .nav {
        display: none !important;
    }

    .user-menu {
        display: none !important;
    }

    .mobile-menu-btn {
        display: block;
    }
}