/* ==========================================================================
   疾风云 (JiFeng Cloud) - 奢华黑金与等离子疾风速度感设计系统
   Obsidian Black & Quantum Fluid Gold / Plasma Velocity
   纯原生 CSS3 | 零外部依赖框架 | 秒开级加载
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 设计变量与双模色彩矩阵 (Color Variables)
   -------------------------------------------------------------------------- */
:root {
    /* 亮色模式：香槟微金 / 铂金奢石 (Light Theme - Platinum Champagne) */
    --bg-void: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-hover: rgba(255, 255, 255, 0.98);
    
    --text-primary: #09090b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --text-inverse: #ffffff;

    --gold-solar: #d97706;
    --gold-amber: #b45309;
    --gold-bright: #f59e0b;
    --gold-gradient: linear-gradient(135deg, #f59e0b 0%, #d97706 50%, #92400e 100%);
    --gold-glow: rgba(217, 119, 6, 0.2);
    --gold-border: rgba(217, 119, 6, 0.35);

    --border-subtle: rgba(226, 232, 240, 0.9);
    --border-metallic: linear-gradient(135deg, rgba(217, 119, 6, 0.4), rgba(226, 232, 240, 0.8), rgba(217, 119, 6, 0.2));
    
    --header-bg: rgba(255, 255, 255, 0.82);
    --header-border: rgba(226, 232, 240, 0.9);
    
    --glass-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.08), 0 20px 25px -5px rgba(0, 0, 0, 0.04);
    --card-shadow-hover: 0 20px 40px -15px rgba(217, 119, 6, 0.25);
    
    --carbon-pattern: radial-gradient(#e2e8f0 1px, transparent 1px);
    --badge-bg: rgba(217, 119, 6, 0.1);
    --badge-text: #b45309;
}

[data-theme="dark"] {
    /* 暗色模式：黑曜石黑 + 量子流金 (Dark Theme - Obsidian & Quantum Gold) */
    --bg-void: #000000;
    --bg-surface: #0a0b0e;
    --bg-surface-elevated: #121318;
    --bg-card: rgba(18, 19, 24, 0.75);
    --bg-card-hover: rgba(24, 25, 32, 0.9);
    
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --text-inverse: #000000;

    --gold-solar: #f59e0b;
    --gold-amber: #d97706;
    --gold-bright: #fbbf24;
    --gold-gradient: linear-gradient(135deg, #fbbf24 0%, #f59e0b 50%, #d97706 100%);
    --gold-glow: rgba(245, 158, 11, 0.35);
    --gold-border: rgba(245, 158, 11, 0.4);

    --border-subtle: rgba(255, 255, 255, 0.08);
    --border-metallic: linear-gradient(135deg, rgba(245, 158, 11, 0.5), rgba(255, 255, 255, 0.12), rgba(217, 119, 6, 0.3));
    
    --header-bg: rgba(10, 11, 14, 0.85);
    --header-border: rgba(245, 158, 11, 0.15);
    
    --glass-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.8), 0 0 1px 1px rgba(255, 255, 255, 0.05);
    --card-shadow-hover: 0 24px 50px -15px rgba(245, 158, 11, 0.3);
    
    --carbon-pattern: radial-gradient(rgba(245, 158, 11, 0.08) 1px, transparent 1px);
    --badge-bg: rgba(245, 158, 11, 0.12);
    --badge-text: #fbbf24;
}

/* --------------------------------------------------------------------------
   2. 样式重置与排版规范 (Reset & Typography)
   -------------------------------------------------------------------------- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: var(--bg-void);
    color: var(--text-primary);
    line-height: 1.65;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
    background-image: var(--carbon-pattern);
    background-size: 24px 24px;
    transition: background-color 0.4s ease, color 0.4s ease;
}

a {
    color: inherit;
    text-decoration: none;
    transition: all 0.25s ease;
}

ul {
    list-style: none;
}

/* --------------------------------------------------------------------------
   3. 流体金流光画布背景 (Fluid Gold Canvas Simulation)
   -------------------------------------------------------------------------- */
.canvas-ambient-wrap {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
    overflow: hidden;
}

#fluidCanvas {
    width: 100%;
    height: 100%;
    opacity: 0.65;
}

/* --------------------------------------------------------------------------
   4. 通用容器与金属磨砂面板 (Metallic Glassmorphism)
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: 1240px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 96px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 60px auto;
}

.section-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--badge-text);
    background: var(--badge-bg);
    border: 1px solid var(--gold-border);
    border-radius: 9999px;
    margin-bottom: 18px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.25;
    letter-spacing: -0.025em;
    margin-bottom: 18px;
    color: var(--text-primary);
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.75;
}

/* 金属光泽卡片面板 (Metallic Carbon Frosted Panel) */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    box-shadow: var(--glass-shadow);
    transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1),
                border-color 0.35s ease,
                background-color 0.35s ease,
                box-shadow 0.35s ease;
    position: relative;
    overflow: hidden;
}

/* 鼠标悬停时的金属流光掠影动画 */
.glass-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: -120%;
    width: 80%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(245, 158, 11, 0.12), transparent);
    transform: skewX(-25deg);
    transition: left 0.75s ease;
    pointer-events: none;
}

.glass-panel:hover::before {
    left: 140%;
}

.glass-panel:hover {
    border-color: var(--gold-border);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

/* --------------------------------------------------------------------------
   5. 顶部悬浮奢华黑金导航栏 (Floating Header)
   -------------------------------------------------------------------------- */
.header-wrapper {
    position: fixed;
    top: 16px;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 0 20px;
}

.navbar {
    max-width: 1240px;
    margin: 0 auto;
    height: 70px;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--header-bg);
    backdrop-filter: blur(28px);
    -webkit-backdrop-filter: blur(28px);
    border: 1px solid var(--header-border);
    border-radius: 9999px;
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.18);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.brand-logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gold-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000000;
    box-shadow: 0 4px 14px var(--gold-glow);
}

.brand-logo-icon svg {
    width: 22px;
    height: 22px;
}

.brand-text span {
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 22px;
}

.nav-link {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 2px;
    transition: color 0.25s ease;
}

.nav-link:hover {
    color: var(--gold-bright);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0%;
    height: 2px;
    background: var(--gold-gradient);
    border-radius: 2px;
    transition: width 0.25s ease;
}

.nav-link:hover::after {
    width: 100%;
}

/* 导航中‘推荐资讯’高亮特色胶囊 */
.nav-link-badge {
    padding: 4px 12px;
    border-radius: 9999px;
    background: var(--badge-bg);
    border: 1px solid var(--gold-border);
    color: var(--gold-bright);
    font-weight: 600;
}

.nav-link-badge:hover {
    background: var(--gold-gradient);
    color: #000000;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 14px;
}

/* 顶级质感半透明昼夜切换按钮 */
.theme-toggle-btn {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: 1px solid var(--gold-border);
    background: rgba(245, 158, 11, 0.08);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gold-solar);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    outline: none;
}

.theme-toggle-btn:hover {
    border-color: var(--gold-bright);
    color: var(--gold-bright);
    transform: rotate(20deg) scale(1.08);
    box-shadow: 0 0 20px var(--gold-glow);
}

.theme-toggle-btn svg {
    width: 20px;
    height: 20px;
}

[data-theme="dark"] .icon-moon { display: block; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: block; }

/* 按钮基础规范 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 700;
    padding: 11px 24px;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.2, 0.8, 0.2, 1);
    border: 1px solid transparent;
    text-align: center;
    white-space: nowrap;
    min-height: 46px;
}

.btn-primary {
    background: var(--gold-gradient);
    color: #000000 !important;
    box-shadow: 0 6px 20px var(--gold-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px var(--gold-glow);
    filter: brightness(1.1);
}

.btn-secondary {
    background: rgba(245, 158, 11, 0.05);
    color: var(--text-primary);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.btn-secondary:hover {
    background: rgba(245, 158, 11, 0.12);
    border-color: var(--gold-border);
    color: var(--gold-bright);
    transform: translateY(-2px);
}

.btn-large {
    font-size: 1.05rem;
    padding: 15px 36px;
    min-height: 54px;
}

.btn-block {
    width: 100%;
}

/* --------------------------------------------------------------------------
   6. 英雄主视觉区 (Hero Section)
   -------------------------------------------------------------------------- */
.hero-section {
    padding-top: 175px;
    padding-bottom: 96px;
    text-align: center;
}

.hero-content {
    max-width: 920px;
    margin: 0 auto;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 6px 20px;
    border-radius: 9999px;
    background: var(--badge-bg);
    border: 1px solid var(--gold-border);
    color: var(--gold-bright);
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: 26px;
    letter-spacing: 0.05em;
}

.hero-tag .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--gold-solar);
    box-shadow: 0 0 10px var(--gold-solar);
    animation: goldPulse 2s infinite;
}

@keyframes goldPulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.35; transform: scale(0.8); }
}

.hero-headline {
    font-size: 3.6rem;
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -0.03em;
    margin-bottom: 22px;
}

.hero-headline .gradient-text {
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.hero-subheadline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
    max-width: 780px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta-group {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    padding: 24px 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text-primary);
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 0.88rem;
    color: var(--text-muted);
    margin-top: 4px;
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   7. 核心优势介绍 (3个图文卡片)
   -------------------------------------------------------------------------- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    padding: 42px 32px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.feature-icon-wrapper {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    background: var(--badge-bg);
    border: 1px solid var(--gold-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gold-solar);
    margin-bottom: 26px;
    transition: transform 0.35s ease;
}

.feature-card:hover .feature-icon-wrapper {
    transform: scale(1.1) rotate(6deg);
    background: var(--gold-gradient);
    color: #000000;
}

.feature-icon-wrapper svg {
    width: 28px;
    height: 28px;
}

.feature-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-desc {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.feature-tags {
    display: flex;
    gap: 8px;
    margin-top: 22px;
    flex-wrap: wrap;
}

.feature-tag-item {
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 9999px;
    background: rgba(245, 158, 11, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--gold-bright);
}

/* --------------------------------------------------------------------------
   8. 交互式专线通道对比展示 (Interactive Route Comparison)
   -------------------------------------------------------------------------- */
.comparison-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
    margin-top: 20px;
}

.comparison-box {
    padding: 36px 32px;
    border-radius: 20px;
    position: relative;
}

.comparison-box.public {
    border-left: 4px solid #ef4444;
}

.comparison-box.dedicated {
    border-left: 4px solid var(--gold-solar);
    background: linear-gradient(180deg, var(--bg-card) 0%, rgba(245, 158, 11, 0.04) 100%);
    box-shadow: 0 10px 30px var(--gold-glow);
}

.comparison-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.comparison-title {
    font-size: 1.3rem;
    font-weight: 700;
}

.comparison-badge {
    font-size: 0.8rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 6px;
}

.badge-bad {
    background: rgba(239, 68, 68, 0.15);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.badge-good {
    background: var(--badge-bg);
    color: var(--gold-bright);
    border: 1px solid var(--gold-border);
}

.metric-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 0;
    border-bottom: 1px dashed var(--border-subtle);
    font-size: 0.95rem;
}

.metric-label {
    color: var(--text-muted);
}

.metric-val {
    font-weight: 700;
}

.val-bad { color: #ef4444; }
.val-good { color: var(--gold-bright); }

/* 模拟信号波形条 */
.wave-bar-wrap {
    margin-top: 20px;
    padding: 16px;
    border-radius: 12px;
    background: rgba(0, 0, 0, 0.25);
}

.wave-title {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
}

.wave-visual {
    height: 6px;
    border-radius: 3px;
    width: 100%;
}

.wave-visual.bad {
    background: repeating-linear-gradient(90deg, #ef4444, #ef4444 10px, transparent 10px, transparent 20px);
    animation: jitterWave 0.8s infinite linear;
}

.wave-visual.good {
    background: var(--gold-gradient);
    box-shadow: 0 0 10px var(--gold-solar);
}

@keyframes jitterWave {
    0% { transform: translateX(0); }
    50% { transform: translateX(4px); }
    100% { transform: translateX(0); }
}

/* --------------------------------------------------------------------------
   9. 流媒体图卡 & AI 支持图卡 (Matrix)
   -------------------------------------------------------------------------- */
.matrix-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.matrix-card {
    padding: 38px 32px;
    display: flex;
    flex-direction: column;
}

.matrix-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
}

.matrix-header-icon {
    width: 50px;
    height: 50px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gold-gradient);
    color: #000000;
    box-shadow: 0 6px 18px var(--gold-glow);
}

.matrix-header-icon svg {
    width: 26px;
    height: 26px;
}

.matrix-header-info h3 {
    font-size: 1.35rem;
    font-weight: 700;
}

.matrix-header-info p {
    font-size: 0.92rem;
    color: var(--text-muted);
}

.matrix-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 14px;
    margin-bottom: 24px;
}

.matrix-pill {
    padding: 14px 16px;
    background: rgba(245, 158, 11, 0.03);
    border: 1px solid var(--border-subtle);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.25s ease;
}

.matrix-pill:hover {
    border-color: var(--gold-border);
    transform: translateY(-2px);
    background: rgba(245, 158, 11, 0.08);
}

.pill-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.pill-logo {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-subtle);
}

.pill-name {
    font-size: 0.95rem;
    font-weight: 600;
}

.pill-status {
    font-size: 0.78rem;
    padding: 2px 8px;
    border-radius: 9999px;
    background: var(--badge-bg);
    color: var(--gold-bright);
    font-weight: 700;
}

.matrix-footer-tip {
    margin-top: auto;
    font-size: 0.92rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-subtle);
    padding-top: 18px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* --------------------------------------------------------------------------
   10. 客户端生态中心 (Client Download Hub)
   -------------------------------------------------------------------------- */
.client-tabs {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.client-tab-btn {
    padding: 10px 22px;
    border-radius: 9999px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.25s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.client-tab-btn.active, .client-tab-btn:hover {
    background: var(--gold-gradient);
    color: #000000;
    border-color: transparent;
    box-shadow: 0 4px 15px var(--gold-glow);
}

.client-tab-pane {
    display: none;
    animation: fadeIn 0.4s ease;
}

.client-tab-pane.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: translateY(0); }
}

.client-content-card {
    padding: 40px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
}

.client-info h3 {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 12px;
}

.client-info p {
    font-size: 0.98rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.7;
}

.client-specs {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 28px;
}

.client-spec-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.92rem;
    color: var(--text-muted);
}

.client-spec-item svg {
    color: var(--gold-bright);
    width: 18px;
    height: 18px;
}

.client-preview-box {
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 24px;
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--gold-bright);
    line-height: 1.8;
}

/* --------------------------------------------------------------------------
   11. 真实套餐价格对比表 (Pricing Table)
   -------------------------------------------------------------------------- */
#pricing {
    padding: 48px 0 68px 0;
    scroll-margin-top: 80px;
}

#pricing .section-header {
    margin: 0 auto 34px auto;
}

#pricing .section-badge {
    margin-bottom: 12px;
}

#pricing .section-title {
    font-size: 2.2rem;
    margin-bottom: 12px;
}

#pricing .section-desc {
    font-size: 1rem;
    line-height: 1.6;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    align-items: stretch;
    justify-content: center;
}

.pricing-card {
    padding: 36px 28px;
    display: flex;
    flex-direction: column;
    position: relative;
    border-radius: 24px;
    overflow: visible !important;
}

.pricing-card::before {
    display: none;
}

/* 尊贵推荐款高亮 */
.pricing-card.featured {
    border-color: var(--gold-solar);
    background: var(--bg-card-hover);
    box-shadow: 0 24px 60px -15px var(--gold-glow), var(--glass-shadow);
    transform: scale(1.03);
    z-index: 2;
    overflow: visible !important;
}

.popular-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gold-gradient);
    color: #000000;
    font-size: 0.82rem;
    font-weight: 800;
    padding: 5px 18px;
    border-radius: 9999px;
    letter-spacing: 0.05em;
    box-shadow: 0 4px 14px var(--gold-glow);
    white-space: nowrap;
    z-index: 10;
    line-height: 1.2;
}

.plan-header {
    margin-bottom: 18px;
}

.plan-name {
    font-size: 1.45rem;
    font-weight: 800;
    margin-bottom: 6px;
}

.plan-desc {
    font-size: 0.9rem;
    color: var(--text-muted);
}

.plan-price-wrap {
    display: flex;
    align-items: baseline;
    gap: 4px;
    margin-bottom: 22px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border-subtle);
}

.currency {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gold-solar);
}

.price-number {
    font-size: 3.1rem;
    font-weight: 900;
    line-height: 1;
    color: var(--text-primary);
}

.price-period {
    font-size: 0.92rem;
    color: var(--text-muted);
    font-weight: 600;
}

.plan-features-list {
    margin-bottom: 28px;
    flex-grow: 1;
}

.plan-feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    font-size: 0.93rem;
    color: var(--text-secondary);
}

.plan-feature-item svg {
    width: 17px;
    height: 17px;
    color: var(--gold-bright);
    flex-shrink: 0;
}

/* --------------------------------------------------------------------------
   12. 用户口碑评价 (Reviews)
   -------------------------------------------------------------------------- */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.review-card {
    padding: 36px 30px;
    display: flex;
    flex-direction: column;
}

.review-stars {
    color: var(--gold-bright);
    font-size: 1.15rem;
    margin-bottom: 18px;
    letter-spacing: 4px;
}

.review-text {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.75;
    margin-bottom: 24px;
    flex-grow: 1;
    font-style: italic;
}

.reviewer-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
}

.reviewer-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gold-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000000;
    font-weight: 800;
    font-size: 1.05rem;
}

.reviewer-info h4 {
    font-size: 0.98rem;
    font-weight: 700;
    color: var(--text-primary);
}

.reviewer-info p {
    font-size: 0.82rem;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   13. 常见问题解答 (FAQ)
   -------------------------------------------------------------------------- */
.faq-list {
    max-width: 880px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.faq-item {
    padding: 26px 30px;
    border-radius: 18px;
}

.faq-question {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 12px;
}

.faq-question svg {
    width: 22px;
    height: 22px;
    color: var(--gold-solar);
    flex-shrink: 0;
}

.faq-answer {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.75;
    padding-left: 34px;
}

/* --------------------------------------------------------------------------
   14. 页脚 (Footer - 严格只保留四个标题)
   -------------------------------------------------------------------------- */
.site-footer {
    padding: 56px 0 38px 0;
    margin-top: 70px;
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.footer-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.footer-link {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-secondary);
    position: relative;
    padding: 6px 14px;
    border-radius: 8px;
    transition: all 0.25s ease;
}

.footer-link:hover {
    color: var(--gold-bright);
    background: rgba(245, 158, 11, 0.08);
}

.footer-copyright {
    text-align: center;
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   15. 独立子页面样式 (Subpage Styles)
   -------------------------------------------------------------------------- */
.subpage-container {
    max-width: 900px;
    margin: 140px auto 80px auto;
    padding: 0 24px;
}

.subpage-card {
    padding: 48px;
    border-radius: 24px;
}

.subpage-title {
    font-size: 2.3rem;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.subpage-subtitle {
    font-size: 1.02rem;
    color: var(--text-muted);
    margin-bottom: 36px;
    padding-bottom: 22px;
    border-bottom: 1px solid var(--border-subtle);
}

.subpage-content h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 30px 0 14px 0;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.subpage-content h3::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 18px;
    background: var(--gold-gradient);
    border-radius: 2px;
}

.subpage-content p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.85;
    margin-bottom: 16px;
}

.subpage-content ul {
    margin: 12px 0 24px 20px;
    list-style-type: disc;
}

.subpage-content li {
    font-size: 0.98rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 8px;
}

.subpage-nav-back {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 24px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gold-bright);
}

.subpage-nav-back:hover {
    text-decoration: underline;
}

/* 资讯页面专用网格样式 */
.news-grid {
    display: grid;
    gap: 32px;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    margin-top: 40px;
}

.news-card {
    padding: 34px;
    display: flex;
    flex-direction: column;
}

.news-card h3 {
    font-size: 1.3rem;
    margin-bottom: 14px;
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.4;
}

.news-card p {
    color: var(--text-secondary);
    flex-grow: 1;
    margin-bottom: 24px;
    font-size: 0.96rem;
    line-height: 1.7;
}

.news-card .read-more {
    font-weight: 700;
    color: var(--gold-bright);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.news-card .read-more:hover {
    color: var(--gold-solar);
    transform: translateX(6px);
}

.news-meta {
    font-size: 0.82rem;
    color: var(--gold-solar);
    margin-bottom: 12px;
    font-weight: 600;
    letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   15.5 SEO 深度长篇科普文章专有排版 (Long-form SEO Articles)
   -------------------------------------------------------------------------- */
.article-container {
    max-width: 920px;
    margin: 140px auto 80px auto;
    padding: 0 24px;
}

.article-panel {
    padding: 56px 48px;
    border-radius: 24px;
}

.article-header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--border-subtle);
}

.article-title {
    font-size: 2.35rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 18px;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.article-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 18px;
    font-size: 0.88rem;
    color: var(--text-muted);
    flex-wrap: wrap;
}

.article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* 文章目录 (Table of Contents) */
.toc-box {
    background: rgba(245, 158, 11, 0.04);
    border: 1px solid var(--gold-border);
    border-radius: 16px;
    padding: 26px 30px;
    margin: 36px 0 48px 0;
}

.toc-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 14px;
    color: var(--gold-bright);
    display: flex;
    align-items: center;
    gap: 8px;
}

.toc-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding-left: 0 !important;
    margin: 0 !important;
}

.toc-list li a {
    color: var(--text-secondary);
    font-size: 0.96rem;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.toc-list li a:hover {
    color: var(--gold-bright);
    transform: translateX(4px);
}

/* 正文深度排版 */
.article-body h2 {
    font-size: 1.65rem;
    font-weight: 800;
    margin: 44px 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 10px;
}

.article-body h2::before {
    content: '';
    display: inline-block;
    width: 5px;
    height: 22px;
    background: var(--gold-gradient);
    border-radius: 3px;
}

.article-body h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 28px 0 14px 0;
    color: var(--text-primary);
}

.article-body p {
    font-size: 1.02rem;
    line-height: 1.85;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.article-body strong {
    color: var(--text-primary);
    font-weight: 700;
}

.article-body ul, .article-body ol {
    margin: 16px 0 24px 24px;
}

.article-body li {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* 强调高亮提示框 */
.article-callout {
    padding: 20px 24px;
    border-radius: 14px;
    background: rgba(245, 158, 11, 0.06);
    border-left: 4px solid var(--gold-solar);
    margin: 28px 0;
    font-size: 0.98rem;
    line-height: 1.75;
    color: var(--text-secondary);
}

.article-callout strong {
    color: var(--gold-bright);
}

/* 深度对比数据表 */
.article-table {
    width: 100%;
    border-collapse: collapse;
    margin: 28px 0;
    border-radius: 12px;
    overflow: hidden;
    font-size: 0.95rem;
}

.article-table th {
    background: rgba(245, 158, 11, 0.12);
    color: var(--gold-bright);
    font-weight: 700;
    padding: 14px 18px;
    text-align: left;
    border-bottom: 1px solid var(--gold-border);
}

.article-table td {
    padding: 13px 18px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

.article-table tr:hover td {
    background: rgba(245, 158, 11, 0.03);
}

/* 文章专属高转化 CTA 横幅 */
.article-cta-banner {
    margin: 48px 0;
    padding: 36px 32px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(217, 119, 6, 0.04) 100%);
    border: 1px solid var(--gold-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.article-cta-text h4 {
    font-size: 1.3rem;
    font-weight: 800;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.article-cta-text p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 0 !important;
}

/* FAQ 板块 */
.article-faq-wrap {
    margin: 48px 0;
    padding: 32px;
    border-radius: 18px;
    background: rgba(245, 158, 11, 0.03);
    border: 1px solid var(--border-subtle);
}

.article-faq-wrap h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: var(--gold-bright);
}

.faq-qa-item {
    margin-bottom: 20px;
    padding-bottom: 16px;
    border-bottom: 1px dashed var(--border-subtle);
}

.faq-qa-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-q-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.faq-a-desc {
    font-size: 0.96rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 0 !important;
}

/* 相关阅读 */
.article-related {
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid var(--border-subtle);
}

.article-related h3 {
    margin-top: 0;
    margin-bottom: 18px;
    font-size: 1.25rem;
    font-weight: 700;
}

.related-links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 16px;
}

.related-link-card {
    padding: 16px 20px;
    border-radius: 12px;
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.25s ease;
}

.related-link-card:hover {
    border-color: var(--gold-border);
    transform: translateY(-2px);
    color: var(--gold-bright);
}

/* --------------------------------------------------------------------------
   16. 移动端媒体查询适配 (@media Queries)
   -------------------------------------------------------------------------- */
@media (max-width: 992px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .comparison-container { grid-template-columns: 1fr; }
    .client-content-card { grid-template-columns: 1fr; }
    .pricing-grid {
        grid-template-columns: repeat(1, 1fr);
        max-width: 540px;
        margin: 0 auto;
    }
    .pricing-card.featured { transform: none; }
    .reviews-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    html { scroll-padding-top: 85px; }
    .header-wrapper { top: 10px; padding: 0 12px; }
    .navbar { height: 62px; padding: 0 16px; }
    .brand-logo { font-size: 1.15rem; }
    .brand-logo-icon { width: 30px; height: 30px; }
    .nav-menu { display: none; } /* 移动端保持极简干练 */
    .hero-section { padding-top: 135px; padding-bottom: 60px; }
    .hero-headline { font-size: 2.35rem; }
    .hero-subheadline { font-size: 1.05rem; margin-bottom: 28px; }
    .hero-cta-group { flex-direction: column; width: 100%; }
    .hero-cta-group .btn { width: 100%; }
    .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 16px; padding: 20px 16px; }
    .features-grid { grid-template-columns: 1fr; }
    .matrix-grid { grid-template-columns: 1fr; }
    .matrix-items { grid-template-columns: 1fr; }
    .reviews-grid { grid-template-columns: 1fr; }
    .section-title { font-size: 1.9rem; }
    .footer-nav { gap: 16px; flex-direction: column; }
    .subpage-container { margin-top: 100px; padding: 0 16px; }
    .subpage-card { padding: 30px 20px; }
    .faq-answer { padding-left: 0; margin-top: 8px; }
}

@media (max-width: 480px) {
    .hero-headline { font-size: 2rem; }
    .btn-large { padding: 13px 26px; font-size: 1rem; }
    .price-number { font-size: 2.8rem; }
}