/* 青云梯 (QingYunTi) 全站样式表 - style.css */
:root {
    --primary-cyan: #16b8be;
    --primary-cyan-hover: #0ea2a8;
    --primary-cyan-light: #e6f9fa;
    --primary-cyan-border: #8ae4e7;
    --cyan-gradient: linear-gradient(135deg, #16b8be 0%, #06b6d4 100%);
    --bg-light: #f6f9fc;
    --bg-white: #ffffff;
    --text-dark: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
    --card-hover-shadow: 0 12px 30px rgba(22, 184, 190, 0.16);
    --transition-fast: 0.25s ease;
    --font-family: 'Plus Jakarta Sans', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
}

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

html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-light);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    word-break: break-word;
}

.container {
    max-width: 1160px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center { text-align: center; }
.text-cyan { color: var(--primary-cyan); }
.cyan-text-bold { color: var(--primary-cyan); font-weight: 700; }

/* 导航栏 */
.navbar {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    height: 72px;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-img {
    height: 38px;
    width: 38px;
    object-fit: contain;
    border-radius: 8px;
}

.brand-text {
    font-size: 1.35rem;
    font-weight: 900;
    color: var(--primary-cyan);
    letter-spacing: -0.3px;
}

.brand-sub {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-left: 4px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav-item {
    text-decoration: none;
    color: var(--text-dark);
    font-size: 0.95rem;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.nav-item:hover, .nav-item.active {
    color: var(--primary-cyan);
}

.nav-knowledge-btn {
    color: #0284c7;
    background-color: #e0f2fe;
    padding: 4px 12px;
    border-radius: 20px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* 按钮通用 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 9px 20px;
    font-size: 0.95rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    border: 1px solid transparent;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1.05rem;
}

.btn-ghost {
    background: transparent;
    color: var(--text-dark);
}

.btn-ghost:hover {
    color: var(--primary-cyan);
}

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

.btn-primary:hover {
    background-color: var(--primary-cyan);
    color: #ffffff;
}

.btn-outline-cyan {
    background-color: transparent;
    border: 1.5px solid var(--primary-cyan);
    color: var(--primary-cyan);
    width: 100%;
}

.btn-outline-cyan:hover {
    background-color: var(--primary-cyan);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(22, 184, 190, 0.35);
}

.btn-solid-cyan {
    background: var(--cyan-gradient);
    border: none;
    color: #ffffff;
}

.btn-solid-cyan:hover {
    opacity: 0.93;
    transform: translateY(-1px);
    box-shadow: 0 6px 18px rgba(22, 184, 190, 0.4);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
}

.mobile-toggle span {
    width: 22px;
    height: 2px;
    background-color: var(--text-dark);
    transition: 0.3s;
}

/* 顶部公告栏 */
.announcement-bar {
    background-color: var(--primary-cyan-light);
    border-bottom: 1px solid var(--primary-cyan-border);
    padding: 10px 0;
    font-size: 0.88rem;
    color: var(--text-dark);
    text-align: center;
}

.badge-new {
    background-color: var(--primary-cyan);
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 8px;
}

.highlight-price {
    color: var(--primary-cyan);
    font-size: 1.05rem;
}

/* 英雄区 (Hero Section) */
.hero-section {
    padding: 60px 0 50px 0;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    align-items: center;
}

.section-tag {
    display: inline-block;
    color: var(--primary-cyan);
    font-weight: 800;
    font-size: 0.9rem;
    margin-bottom: 12px;
    letter-spacing: 0.5px;
    background-color: var(--primary-cyan-light);
    padding: 4px 12px;
    border-radius: 20px;
}

.hero-title {
    font-size: 2.3rem;
    font-weight: 900;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.3;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-cta-group {
    display: flex;
    gap: 16px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}

.hero-metrics {
    display: flex;
    gap: 32px;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.metric-num {
    display: block;
    font-size: 1.6rem;
    font-weight: 900;
    color: var(--primary-cyan);
}

.metric-label {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* 动态视觉卡片 */
.visual-card {
    background-color: #0f172a;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    border: 1px solid #1e293b;
}

.visual-card-header {
    background-color: #1e293b;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.dot.red { background-color: #ef4444; }
.dot.yellow { background-color: #f59e0b; }
.dot.green { background-color: #10b981; }

.visual-title {
    color: #94a3b8;
    font-size: 0.82rem;
    font-weight: 600;
    margin-left: auto;
}

.visual-card-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.node-live-row {
    background-color: #1e293b;
    padding: 12px 16px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.node-info {
    display: flex;
    align-items: center;
    gap: 12px;
    color: #f8fafc;
}

.node-info strong {
    display: block;
    font-size: 0.92rem;
}

.node-info small {
    display: block;
    font-size: 0.78rem;
    color: #94a3b8;
}

.ping-badge {
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.82rem;
    font-weight: 800;
}
.status-good {
    background-color: rgba(16, 185, 129, 0.15);
    color: #34d399;
}

/* 核心优势 */
.features-section {
    background-color: var(--bg-white);
    padding: 70px 0;
    border-top: 1px solid var(--border-color);
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 900;
    margin: 8px 0 12px 0;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1rem;
}

.features-grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    margin-top: 40px;
}

.feature-card-item {
    background-color: var(--bg-light);
    border-radius: 16px;
    padding: 32px 24px;
    border: 1px solid var(--border-color);
    transition: transform var(--transition-fast);
}

.feature-card-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
}

.card-icon-wrapper {
    font-size: 2.2rem;
    margin-bottom: 16px;
}

.feature-card-item h3 {
    font-size: 1.15rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.feature-card-item p {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* 流媒体与 AI 支持 */
.streaming-section {
    padding: 70px 0;
}

.streaming-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 40px;
}

.stream-item {
    background-color: var(--bg-white);
    padding: 24px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
}

.stream-icon { font-size: 2rem; margin-bottom: 10px; }

.stream-item h4 {
    font-size: 1.05rem;
    font-weight: 800;
    margin-bottom: 6px;
}

.stream-item p {
    font-size: 0.88rem;
    color: var(--text-muted);
}

.disclaimer-note {
    margin-top: 24px;
    color: var(--text-muted);
}

/* 定价对比 */
.pricing-section {
    background-color: var(--bg-white);
    padding: 70px 0;
    border-top: 1px solid var(--border-color);
}

.billing-switcher-wrapper {
    margin: 24px 0 40px 0;
}

.billing-switcher {
    display: inline-flex;
    background-color: #e2e8f0;
    padding: 4px;
    border-radius: 30px;
    gap: 4px;
}

.switcher-btn {
    border: none;
    background: transparent;
    padding: 8px 20px;
    border-radius: 24px;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.switcher-btn.active {
    background-color: #ffffff;
    color: var(--primary-cyan);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.discount-pill {
    background-color: #ef4444;
    color: white;
    font-size: 0.72rem;
    padding: 2px 6px;
    border-radius: 10px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.pricing-card {
    background-color: var(--bg-white);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    padding: 32px 28px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    box-shadow: var(--card-shadow);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.pricing-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-hover-shadow);
}

.pricing-card.featured {
    border: 2px solid var(--primary-cyan);
    box-shadow: 0 8px 30px rgba(22, 184, 190, 0.18);
}

.pricing-card .ribbon {
    position: absolute;
    top: -12px;
    right: 24px;
    background: var(--cyan-gradient);
    color: #ffffff;
    font-size: 0.78rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 12px;
}

.card-header {
    text-align: center;
    border-bottom: 1px dashed var(--border-color);
    padding-bottom: 24px;
    margin-bottom: 24px;
}

.plan-name {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-dark);
    margin-bottom: 12px;
}

.plan-price {
    display: flex;
    align-items: baseline;
    justify-content: center;
    color: #0f172a;
}

.plan-price .currency {
    font-size: 1.5rem;
    font-weight: 800;
}

.plan-price .amount {
    font-size: 2.8rem;
    font-weight: 900;
}

.plan-price .period {
    font-size: 0.95rem;
    color: var(--text-muted);
}

.price-subtext {
    font-size: 0.82rem;
    color: var(--primary-cyan);
    margin-top: 6px;
    font-weight: 700;
}

.features-list {
    list-style: none;
    margin-bottom: 32px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.features-list li {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    border-bottom: 1px dotted #f1f5f9;
    padding-bottom: 6px;
}

.feature-label { color: var(--text-muted); }
.feature-val { font-weight: 700; color: var(--text-dark); }

.subscribe-btn { width: 100%; text-align: center; }

/* FAQ */
.faq-section {
    padding: 70px 0;
}

.faq-accordion {
    max-width: 820px;
    margin: 36px auto 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background-color: var(--bg-white);
    border-radius: 12px;
    padding: 20px 24px;
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    cursor: pointer;
}

.faq-item summary {
    font-weight: 800;
    font-size: 1rem;
    outline: none;
    color: var(--text-dark);
}

.faq-item p {
    margin-top: 12px;
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.7;
}

/* 章节悬浮导航箭头 (Floating Section Navigator) */
.section-nav-arrows {
    position: fixed;
    right: 20px;
    bottom: 40px;
    z-index: 990;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-arrow-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--primary-cyan);
    color: var(--primary-cyan);
    font-size: 1.1rem;
    font-weight: 900;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.nav-arrow-btn:hover:not(:disabled) {
    background-color: var(--primary-cyan);
    color: #ffffff;
    transform: scale(1.08);
}

.nav-arrow-btn:disabled {
    opacity: 0.35;
    cursor: not-allowed;
    border-color: #cbd5e1;
    color: #94a3b8;
}

/* 页脚 - 仅保留4个入口，全部分别指向独立页面 */
.footer {
    background-color: #0f172a;
    color: #94a3b8;
    padding: 50px 0 24px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand p {
    margin-top: 10px;
    font-size: 0.88rem;
    max-width: 400px;
}

.footer-links-only {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-links-only a {
    color: #cbd5e1;
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 600;
    transition: color var(--transition-fast);
}

.footer-links-only a:hover {
    color: var(--primary-cyan);
}

.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 20px;
    font-size: 0.82rem;
}

/* 响应式样式 (Responsive) */
@media (max-width: 992px) {
    .hero-grid {
        grid-template-columns: 1fr;
    }

    .features-grid-3, .streaming-grid, .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .nav-links.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background-color: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    }

    .mobile-toggle {
        display: flex;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .section-nav-arrows {
        right: 12px;
        bottom: 20px;
    }

    .nav-arrow-btn {
        width: 38px;
        height: 38px;
        font-size: 0.9rem;
    }

    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }
}