/* ==========================================================================
   设计系统与 CSS 变量 (Design System Tokens)
   ========================================================================== */
   :root {
    --bg-primary: #0b0f19;
    --bg-surface: rgba(255, 255, 255, 0.03);
    --bg-surface-hover: rgba(255, 255, 255, 0.06);
    --bg-glass: rgba(11, 15, 25, 0.7);
    
    --text-main: #ffffff;
    --text-muted: #94a3b8;
    --text-secondary: #cbd5e1;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(0, 242, 254, 0.4);
    
    --primary-gradient: linear-gradient(135deg, #00f2fe 0%, #4facfe 100%);
    --secondary-gradient: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
    --popular-gradient: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    
    --color-cyan: #00f2fe;
    --color-blue: #4facfe;
    --color-green: #10b981;
    --color-gold: #f59e0b;
    
    --font-stack: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', Roboto, 'Helvetica Neue', Arial, sans-serif;
    
    --transition-all: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-reveal: all 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ==========================================================================
   全局初始化 (Global Reset & Base)
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-stack);
    background-color: var(--bg-primary);
    color: var(--text-main);
    line-height: 1.5;
    overflow-x: hidden;
}

body {
    position: relative;
    overflow-x: hidden;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-all);
}

ul, ol {
    list-style: none;
}

button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

/* ==========================================================================
   动态背景光晕 (Glowing Background Elements)
   ========================================================================== */
.glow-bg {
    position: absolute;
    filter: blur(120px);
    z-index: 0;
    pointer-events: none;
    opacity: 0.25;
    border-radius: 50%;
    animation: pulse-glow 8s infinite alternate ease-in-out;
}

.glow-1 {
    top: -100px;
    left: 10%;
    width: 500px;
    height: 500px;
    background: #00f2fe;
}

.glow-2 {
    top: 400px;
    right: 5%;
    width: 600px;
    height: 600px;
    background: #a855f7;
}

@keyframes pulse-glow {
    0% { transform: scale(1); opacity: 0.2; }
    100% { transform: scale(1.3); opacity: 0.35; }
}

/* ==========================================================================
   滚动显现动画系统 (Scroll Reveal System)
   ========================================================================== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: var(--transition-reveal);
    transition-delay: var(--delay, 0s);
}
.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: var(--transition-reveal);
    transition-delay: var(--delay, 0s);
}
.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(50px);
    transition: var(--transition-reveal);
    transition-delay: var(--delay, 0s);
}
.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

/* ==========================================================================
   顶部导航栏 (Navbar)
   ========================================================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1300px;
    margin: 0 auto;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.brand-name {
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

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

/* ==========================================================================
   按钮组件 (Buttons)
   ========================================================================== */
.cta-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 600;
    border-radius: 9999px;
    transition: var(--transition-all);
    position: relative;
    overflow: hidden;
}

.btn-sm {
    padding: 0.5rem 1.25rem;
    font-size: 0.9rem;
    background: var(--primary-gradient);
    color: #000;
    font-weight: 700;
}

.btn-sm:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 242, 254, 0.4);
}

.btn-lg {
    padding: 0.85rem 2.25rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #0b0f19;
    font-weight: 700;
    box-shadow: 0 4px 20px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 242, 254, 0.5);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-hover);
    transform: translateY(-3px);
}

.btn-pricing {
    width: 100%;
    padding: 0.8rem;
    border-radius: 12px;
    font-size: 1rem;
    margin-top: 1.5rem;
}

/* ==========================================================================
   主视觉区域 (非对称沉浸式 Hero Section)
   ========================================================================== */
.hero-section {
    position: relative;
    padding: 9rem 1.5rem 6rem;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4rem;
    max-width: 1300px;
    margin: 0 auto;
    align-items: center;
    width: 100%;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-cyan);
    background: rgba(0, 242, 254, 0.08);
    border: 1px solid rgba(0, 242, 254, 0.2);
    border-radius: 9999px;
    margin-bottom: 2rem;
    backdrop-filter: blur(10px);
}

.live-pulse {
    width: 8px;
    height: 8px;
    background-color: var(--color-cyan);
    border-radius: 50%;
    box-shadow: 0 0 12px var(--color-cyan);
    animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
}

@keyframes ping {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.8); opacity: 0.5; }
}

.hero-headline {
    font-size: 3.6rem;
    font-weight: 800;
    letter-spacing: -1px;
    line-height: 1.18;
    margin-bottom: 1.5rem;
}

.highlight-gradient {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subheadline {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 620px;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-cta-group {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 3.5rem;
}

.hero-trust-metrics {
    display: flex;
    align-items: center;
    gap: 2.5rem;
    padding-top: 2.5rem;
    border-top: 1px solid var(--border-color);
}

.metric-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.metric-value {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-main);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.metric-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.metric-divider {
    width: 1px;
    height: 35px;
    background: var(--border-color);
}

/* ==========================================================================
   实时雷达节点探测动画模拟 (Radar Visualizer)
   ========================================================================== */
.hero-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.radar-container {
    position: relative;
    width: 440px;
    height: 440px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.radar-grid {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.radar-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(0, 242, 254, 0.15);
}

.circle-1 { width: 140px; height: 140px; animation: pulse-ring 4s infinite linear; }
.circle-2 { width: 280px; height: 280px; border-color: rgba(168, 85, 247, 0.2); }
.circle-3 { width: 420px; height: 420px; border-style: dashed; border-color: rgba(0, 242, 254, 0.1); }

@keyframes pulse-ring {
    0% { transform: scale(0.95); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
    100% { transform: scale(0.95); opacity: 0.8; }
}

.radar-beam {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: conic-gradient(from 0deg at 50% 50%, rgba(0, 242, 254, 0.2) 0deg, transparent 60deg, transparent 360deg);
    animation: rotate-beam 6s linear infinite;
}

@keyframes rotate-beam {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.center-core {
    position: relative;
    z-index: 10;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--primary-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 30px rgba(0, 242, 254, 0.6);
}

.core-icon {
    font-size: 1.75rem;
    color: #0b0f19;
}

.node-card {
    position: absolute;
    z-index: 20;
    background: rgba(11, 15, 25, 0.85);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1rem;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    animation: float-node 4s infinite alternate ease-in-out;
}

.node-hk { top: 15%; left: 0%; animation-delay: 0s; }
.node-jp { top: 10%; right: 5%; animation-delay: 1s; }
.node-sg { bottom: 12%; left: 5%; animation-delay: 2s; }
.node-us { bottom: 20%; right: 0%; animation-delay: 3s; }

@keyframes float-node {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}

.node-status {
    width: 10px;
    height: 10px;
    background-color: var(--color-green);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-green);
    animation: ping 2s infinite;
}

.node-info {
    display: flex;
    flex-direction: column;
    font-size: 0.8rem;
}

.node-title { font-weight: 700; color: var(--text-main); }
.node-ping { color: var(--text-muted); font-size: 0.75rem; }
.ping-value { color: var(--color-cyan); font-weight: 700; }

.live-ticker {
    margin-top: 2rem;
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 0.6rem 1.5rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.85rem;
    color: var(--color-cyan);
}

.ticker-dot {
    width: 6px;
    height: 6px;
    background: var(--color-cyan);
    border-radius: 50%;
}

#dynamic-ticker-text {
    transition: opacity 0.3s ease;
}

/* ==========================================================================
   测速体验面板 (Speedtest Section)
   ========================================================================== */
.speedtest-section {
    padding: 6rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 4rem;
    padding: 0 1.5rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.speedtest-card {
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 3rem;
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}

.region-tabs {
    display: flex;
    gap: 1rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2.5rem;
    overflow-x: auto;
}

.region-tab {
    padding: 0.6rem 1.5rem;
    border-radius: 12px;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    transition: var(--transition-all);
    white-space: nowrap;
}

.region-tab:hover {
    color: var(--text-main);
    background: var(--bg-surface-hover);
}

.region-tab.active {
    color: #0b0f19;
    background: var(--primary-gradient);
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.3);
}

.speed-metrics-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.metric-display {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.metric-title {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
}

.metric-number {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

.highlight-cyan { color: var(--color-cyan); }
.highlight-blue { color: var(--color-blue); }
.highlight-green { color: var(--color-green); }
.highlight-gold { color: var(--color-gold); }

.speedtest-bar-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.speedtest-bar {
    width: 100%;
    height: 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 9999px;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.speedtest-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--primary-gradient);
    border-radius: 9999px;
    transition: width 1.2s cubic-bezier(0.1, 0.8, 0.2, 1);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.5);
}

/* ==========================================================================
   核心优势介绍 (Bento Grid 便当盒现代布局)
   ========================================================================== */
.features-section {
    padding: 6rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.bento-card {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 3rem 2.5rem;
    transition: var(--transition-all);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.bento-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    background: var(--bg-surface-hover);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.col-span-2 {
    grid-column: span 2;
}

.feature-icon-wrapper {
    display: inline-flex;
    padding: 1rem;
    border-radius: 16px;
    background: rgba(0, 242, 254, 0.1);
    color: var(--color-cyan);
    margin-bottom: 1.5rem;
    border: 1px solid rgba(0, 242, 254, 0.2);
}

.feature-title {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.feature-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.visual-graph {
    margin-top: 2rem;
    background: rgba(0,0,0,0.3);
    border-radius: 16px;
    padding: 1.5rem;
    border: 1px solid rgba(255,255,255,0.05);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.graph-line {
    height: 10px;
    border-radius: 9999px;
}

.iplc-line {
    width: 100%;
    background: var(--primary-gradient);
    box-shadow: 0 0 12px rgba(0, 242, 254, 0.4);
}

.public-line {
    width: 60%;
    background: var(--popular-gradient);
    opacity: 0.6;
}

.graph-legends {
    display: flex;
    gap: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 1rem;
}

.dot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; }
.dot-iplc { background: var(--color-cyan); }
.dot-public { background: #ef4444; }

.secure-badge-box {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

.secure-badge {
    padding: 0.4rem 1rem;
    background: rgba(168, 85, 247, 0.1);
    border: 1px solid rgba(168, 85, 247, 0.2);
    color: #c084fc;
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
}

.platform-icons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 2rem;
}

.platform-tag {
    padding: 0.4rem 1rem;
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
}

/* ==========================================================================
   套餐价格对比表 (Pricing Section)
   ========================================================================== */
.pricing-section {
    padding: 6rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    align-items: stretch;
}

.pricing-card {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 28px;
    padding: 3.5rem 2.5rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition-all);
    position: relative;
}

.pricing-card:hover {
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-8px);
}

.pricing-popular {
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--color-cyan);
    box-shadow: 0 0 40px rgba(0, 242, 254, 0.15);
}

.pricing-popular:hover {
    border-color: var(--color-cyan);
    box-shadow: 0 15px 50px rgba(0, 242, 254, 0.25);
}

.popular-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-gradient);
    color: #000;
    font-weight: 800;
    font-size: 0.85rem;
    padding: 0.4rem 1.5rem;
    border-radius: 9999px;
    box-shadow: 0 4px 20px rgba(0, 242, 254, 0.4);
    letter-spacing: 0.5px;
}

.pricing-header {
    margin-bottom: 2rem;
}

.package-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

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

.pricing-amount {
    display: flex;
    align-items: baseline;
    margin-bottom: 2.5rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.currency {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.price {
    font-size: 3.8rem;
    font-weight: 800;
    line-height: 1;
    color: var(--text-main);
    margin: 0 0.2rem;
}

.period {
    color: var(--text-muted);
    font-weight: 500;
}

.pricing-features {
    display: flex;
    flex-direction: column;
    gap: 1.15rem;
    flex-grow: 1;
    margin-bottom: 2.5rem;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   常见问题解答 (FAQ Section)
   ========================================================================== */
.faq-section {
    padding: 6rem 1.5rem;
    max-width: 900px;
    margin: 0 auto;
}

.faq-accordion {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

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

.faq-item:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: var(--bg-surface-hover);
}

.faq-question {
    width: 100%;
    padding: 1.75rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-main);
}

.chevron {
    transition: transform 0.3s ease;
    color: var(--color-cyan);
    flex-shrink: 0;
}

.chevron.rotate {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 0 2rem;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.faq-answer.open {
    max-height: 300px;
    padding-bottom: 1.75rem;
}

/* ==========================================================================
   底部转化区 (Bottom CTA Section)
   ========================================================================== */
.bottom-cta-section {
    padding: 6rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.bottom-cta-container {
    background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(0, 242, 254, 0.08) 100%);
    border: 1px solid var(--border-color);
    border-radius: 36px;
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.bottom-title {
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    margin-bottom: 1rem;
}

.bottom-desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

/* ==========================================================================
   页脚 (Footer)
   ========================================================================== */
.footer {
    border-top: 1px solid var(--border-color);
    background: #070a12;
    padding: 6rem 1.5rem 3rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
    margin-bottom: 4rem;
}

.footer-brand .brand-logo {
    margin-bottom: 1.25rem;
}

.footer-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    max-width: 400px;
}

.footer-heading {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.95rem;
}

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.disclaimer {
    color: #64748b;
    font-size: 0.8rem;
}

/* ==========================================================================
   移动端与响应式适配 (Responsive Media Queries)
   ========================================================================== */
@media (max-width: 1100px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 4rem;
        text-align: center;
    }
    
    .hero-subheadline {
        margin: 0 auto 2.5rem;
    }

    .hero-cta-group {
        justify-content: center;
    }

    .hero-trust-metrics {
        justify-content: center;
    }

    .bento-grid {
        grid-template-columns: 1fr;
    }

    .col-span-2 {
        grid-column: span 1;
    }
}

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

    .hero-section {
        padding-top: 8rem;
        padding-bottom: 4rem;
    }

    .hero-headline {
        font-size: 2.4rem;
    }

    .radar-container {
        width: 320px;
        height: 320px;
    }

    .circle-1 { width: 100px; height: 100px; }
    .circle-2 { width: 200px; height: 200px; }
    .circle-3 { width: 300px; height: 300px; }

    .node-card {
        padding: 0.4rem 0.75rem;
    }

    .node-title { font-size: 0.75rem; }

    .hero-cta-group {
        flex-direction: column;
        width: 100%;
    }

    .cta-btn {
        width: 100%;
    }

    .hero-trust-metrics {
        flex-direction: column;
        gap: 1.5rem;
    }

    .metric-divider {
        width: 100px;
        height: 1px;
    }

    .section-title {
        font-size: 1.95rem;
    }

    .speedtest-card, .bento-card, .pricing-card {
        padding: 2rem 1.5rem;
    }

    .bottom-cta-container {
        padding: 4rem 1.5rem;
    }

    .bottom-title {
        font-size: 1.9rem;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }
}

/* ==========================================================================
   优化补充 (2026-11 Optimizations)
   ========================================================================== */
.text-link {
    color: var(--color-cyan);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer-pbn-links {
    margin-top: 20px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}
.footer-pbn-links a { color: rgba(255, 255, 255, 0.6); }
.footer-pbn-links a:hover { color: var(--color-cyan); }
.footer-pbn-links .sep { opacity: 0.4; }

:focus-visible {
    outline: 2px solid var(--color-cyan);
    outline-offset: 3px;
}

/* 移动端底部常驻 CTA */
.mobile-cta-bar { display: none; }

@media (max-width: 768px) {
    .navbar .cta-btn.btn-sm { width: auto; }

    .mobile-cta-bar {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 1rem;
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 99;
        padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom));
        background: var(--bg-glass);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-top: 1px solid var(--border-color);
    }
    .mobile-cta-text { display: flex; flex-direction: column; line-height: 1.3; }
    .mobile-cta-text strong { color: var(--color-cyan); font-size: 1.05rem; }
    .mobile-cta-text span { color: var(--text-muted); font-size: 0.8rem; }
    .mobile-cta-bar .mobile-cta-btn { width: auto; padding: 0.7rem 1.4rem; flex-shrink: 0; }

    .footer { padding-bottom: 6rem; }
}

@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;
    }
    .reveal, .reveal-left, .reveal-right { opacity: 1; transform: none; }
}

@media (max-width: 420px) {
    .hero-headline { font-size: 1.95rem; }
}

/* Hero 品牌名 */
.hero-brand {
    color: #fff;
    letter-spacing: 0;
}
.hero-dot {
    margin: 0 0.25em;
    color: var(--color-cyan);
}
@media (max-width: 768px) {
    .hero-brand { display: block; }
    .hero-dot { display: none; }
}