/* ==========================================
   盘古加速器 - 全新科技风UI设计
   深色主题 + 赛博朋克风格
   ========================================== */

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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a25;
    --accent-cyan: #00f0ff;
    --accent-purple: #a855f7;
    --accent-green: #00ff87;
    --accent-pink: #ff0080;
    --text-primary: #ffffff;
    --text-secondary: #94a3b8;
    --gradient-main: linear-gradient(135deg, #00f0ff 0%, #a855f7 100%);
    --gradient-button: linear-gradient(135deg, #00f0ff 0%, #00ff87 100%);
    --glow-cyan: 0 0 30px rgba(0, 240, 255, 0.5);
    --glow-purple: 0 0 30px rgba(168, 85, 247, 0.5);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 粒子背景 */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: var(--accent-cyan);
    border-radius: 50%;
    opacity: 0.3;
    animation: particleFloat 5s ease-in-out infinite;
}

@keyframes particleFloat {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.3; }
    50% { transform: translateY(-100px) scale(1.5); opacity: 0.8; }
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 20px 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(20px);
    padding: 15px 0;
    border-bottom: 1px solid rgba(0, 240, 255, 0.1);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    position: relative;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon.small {
    width: 36px;
    height: 36px;
}

.logo-ring {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 2px solid var(--accent-cyan);
    border-radius: 50%;
    animation: logoSpin 10s linear infinite;
}

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

.logo-core {
    font-size: 1.5rem;
    font-weight: 900;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 35px;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.3s;
    position: relative;
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-main);
    transition: width 0.3s;
}

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

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

.nav-buttons {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-login {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 10px 20px;
    transition: color 0.3s;
}

.btn-login:hover {
    color: var(--accent-cyan);
}

.btn-start {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--gradient-button);
    color: var(--bg-primary);
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    transition: all 0.3s;
}

.btn-start svg {
    width: 16px;
    height: 16px;
}

.btn-start:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-cyan);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--accent-cyan);
    transition: all 0.3s;
}

/* ==========================================
   Hero 区域
   ========================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 60%;
    height: 100%;
    pointer-events: none;
}

.globe-container {
    position: absolute;
    top: 50%;
    right: 10%;
    transform: translateY(-50%);
    width: 500px;
    height: 500px;
}

.globe {
    position: relative;
    width: 100%;
    height: 100%;
}

.globe-inner {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, rgba(0, 240, 255, 0.3), rgba(168, 85, 247, 0.1) 50%, transparent 70%);
    border: 2px solid rgba(0, 240, 255, 0.3);
    animation: globePulse 4s ease-in-out infinite;
}

@keyframes globePulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.05); }
}

.globe-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 350px;
    height: 350px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.2), transparent 70%);
    filter: blur(30px);
}

.orbit {
    position: absolute;
    top: 50%;
    left: 50%;
    border-radius: 50%;
    border: 1px dashed rgba(0, 240, 255, 0.2);
    animation: orbitSpin 20s linear infinite;
}

.orbit-1 {
    width: 350px;
    height: 350px;
    margin: -175px 0 0 -175px;
}

.orbit-2 {
    width: 420px;
    height: 420px;
    margin: -210px 0 0 -210px;
    animation-duration: 30s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 480px;
    height: 480px;
    margin: -240px 0 0 -240px;
    animation-duration: 40s;
}

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

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 20px;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: 50px;
    font-size: 0.9rem;
    color: var(--accent-cyan);
    margin-bottom: 30px;
}

.pulse {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.5); }
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 25px;
    max-width: 600px;
}

.title-line {
    display: block;
}

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

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 500px;
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    margin-bottom: 60px;
}

.btn-primary {
    position: relative;
    display: inline-flex;
    align-items: center;
    padding: 16px 32px;
    text-decoration: none;
    font-weight: 600;
    border-radius: 50px;
    overflow: hidden;
}

.btn-primary .btn-bg {
    position: absolute;
    inset: 0;
    background: var(--gradient-button);
    transition: opacity 0.3s;
}

.btn-primary .btn-content {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--bg-primary);
    font-size: 1.1rem;
}

.btn-primary svg {
    width: 18px;
    height: 18px;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--glow-cyan);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 16px 32px;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    border-radius: 50px;
    transition: all 0.3s;
}

.btn-secondary:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.1);
}

.btn-arrow {
    transition: transform 0.3s;
}

.btn-secondary:hover .btn-arrow {
    transform: translateX(5px);
}

.hero-stats {
    display: flex;
    gap: 30px;
}

.stat-card {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 20px 25px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 16px;
    backdrop-filter: blur(10px);
}

.stat-icon {
    font-size: 2rem;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-value small {
    font-size: 1rem;
    color: var(--accent-cyan);
}

.stat-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ==========================================
   品牌滚动条
   ========================================== */
.brands-section {
    padding: 40px 0;
    background: rgba(0, 240, 255, 0.02);
    border-top: 1px solid rgba(0, 240, 255, 0.1);
    border-bottom: 1px solid rgba(0, 240, 255, 0.1);
    overflow: hidden;
}

.brands-track {
    display: flex;
    width: max-content;
    animation: scroll 20s linear infinite;
}

@keyframes scroll {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}

.brands-slide {
    display: flex;
    gap: 80px;
    padding: 0 40px;
}

.brand-item {
    font-size: 1.5rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.15);
    white-space: nowrap;
    transition: color 0.3s;
}

.brand-item:hover {
    color: var(--accent-cyan);
}

/* ==========================================
   Section 通用
   ========================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 240, 255, 0.1);
    border: 1px solid rgba(0, 240, 255, 0.3);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--accent-cyan);
    margin-bottom: 20px;
}

.section-title {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 15px;
}

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

/* ==========================================
   功能特性
   ========================================== */
.features {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 25px;
}

.feature-card {
    position: relative;
    padding: 35px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    transition: all 0.4s ease;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-main);
    transform: scaleX(0);
    transition: transform 0.4s;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 240, 255, 0.3);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.card-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 240, 255, 0.1), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s;
}

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

.feature-card.card-large {
    grid-column: span 1;
    grid-row: span 2;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.05), rgba(168, 85, 247, 0.05));
}

.feature-icon {
    width: 60px;
    height: 60px;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

[class^="icon-"] {
    font-size: 3rem;
    display: block;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

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

.feature-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.feature-tags span {
    padding: 6px 14px;
    background: rgba(0, 240, 255, 0.1);
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--accent-cyan);
}

/* ==========================================
   全球节点地图
   ========================================== */
.nodes-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.world-map {
    position: relative;
    width: 100%;
    height: 400px;
    margin-bottom: 50px;
    border-radius: 20px;
    overflow: hidden;
}

.map-bg {
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(0, 240, 255, 0.1), transparent 30%),
        radial-gradient(circle at 80% 30%, rgba(168, 85, 247, 0.1), transparent 30%),
        url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1000 500'%3E%3Cpath fill='none' stroke='%23ffffff' stroke-width='0.5' opacity='0.1' d='M0,250 Q250,200 500,250 T1000,250'/%3E%3C/svg%3E");
    background-size: cover;
    opacity: 0.5;
}

.node-point {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--accent-cyan);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s;
}

.node-point::before {
    content: attr(data-name);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 12px;
    background: var(--bg-card);
    border: 1px solid var(--accent-cyan);
    border-radius: 8px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
}

.node-point:hover::before {
    opacity: 1;
    visibility: visible;
    bottom: calc(100% + 10px);
}

.node-point.active {
    background: var(--accent-green);
    box-shadow: 0 0 20px var(--accent-green);
}

.node-pulse {
    position: absolute;
    inset: -5px;
    border: 2px solid var(--accent-cyan);
    border-radius: 50%;
    animation: nodePulse 2s ease-out infinite;
}

@keyframes nodePulse {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(2.5); opacity: 0; }
}

.nodes-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.node-stat {
    text-align: center;
    padding: 30px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.node-stat-value {
    display: block;
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.node-stat-label {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ==========================================
   速度测试
   ========================================== */
.speed-section {
    padding: 100px 0;
    background: var(--bg-primary);
}

.speed-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 80px;
}

.speed-meter {
    position: relative;
    width: 280px;
    height: 280px;
}

.speed-ring {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.ring-bg {
    fill: none;
    stroke: rgba(255, 255, 255, 0.1);
    stroke-width: 8;
}

.ring-progress {
    fill: none;
    stroke: url(#speedGradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 565;
    stroke-dashoffset: 200;
    transition: stroke-dashoffset 0.5s;
}

.speed-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
}

.speed-number {
    display: block;
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.speed-unit {
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.speed-info h2 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.speed-info p {
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.btn-test {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 35px;
    background: var(--gradient-button);
    border: none;
    border-radius: 50px;
    color: var(--bg-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-test:hover {
    transform: translateY(-2px);
    box-shadow: var(--glow-cyan);
}

.btn-icon.spinning {
    animation: spin 1s linear infinite;
}

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

.speed-details {
    display: flex;
    gap: 30px;
    margin-top: 40px;
}

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

.detail-label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 5px;
}

.detail-value {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--accent-cyan);
}

/* ==========================================
   价格方案
   ========================================== */
.pricing {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.pricing-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 50px;
}

.toggle-label {
    font-size: 1rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.3s;
}

.toggle-label.active {
    color: var(--accent-cyan);
}

.toggle-label em {
    background: var(--accent-green);
    color: var(--bg-primary);
    padding: 3px 8px;
    border-radius: 10px;
    font-size: 0.75rem;
    font-style: normal;
    margin-left: 5px;
}

.toggle-switch {
    width: 50px;
    height: 26px;
    background: var(--bg-card);
    border-radius: 20px;
    cursor: pointer;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.toggle-slider {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    background: var(--gradient-main);
    border-radius: 50%;
    transition: left 0.3s;
}

.toggle-switch.active .toggle-slider {
    left: 27px;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 50px;
}

.pricing-card {
    position: relative;
    padding: 40px 35px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 24px;
    transition: all 0.4s;
}

.pricing-card:hover {
    transform: translateY(-10px);
    border-color: rgba(0, 240, 255, 0.3);
}

.pricing-card.featured {
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(168, 85, 247, 0.1));
    border-color: var(--accent-cyan);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-10px);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 20px;
    background: var(--gradient-main);
    color: var(--bg-primary);
    font-size: 0.85rem;
    font-weight: 600;
    border-radius: 20px;
}

.card-header {
    text-align: center;
    margin-bottom: 25px;
}

.card-header h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.card-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.card-price {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.amount {
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-main);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.period {
    color: var(--text-secondary);
}

.card-features {
    list-style: none;
    margin-bottom: 30px;
}

.card-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-features li:last-child {
    border-bottom: none;
}

.check {
    color: var(--accent-green);
    font-weight: bold;
}

.cross {
    color: #ef4444;
}

.card-features li.disabled {
    opacity: 0.5;
}

.btn-choose {
    display: block;
    width: 100%;
    padding: 16px;
    text-align: center;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 600;
    border-radius: 12px;
    transition: all 0.3s;
}

.btn-choose:hover {
    border-color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.1);
}

.btn-choose.primary {
    background: var(--gradient-button);
    border: none;
    color: var(--bg-primary);
}

.btn-choose.primary:hover {
    box-shadow: var(--glow-cyan);
}

.pricing-guarantee {
    display: flex;
    justify-content: center;
    gap: 50px;
}

.guarantee-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}

.guarantee-icon {
    font-size: 1.3rem;
}

/* ==========================================
   下载客户端
   ========================================== */
.download {
    padding: 100px 0;
    background: var(--bg-primary);
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.download-info h2 {
    font-size: 2.5rem;
    margin: 20px 0 15px;
}

.download-info p {
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.download-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 15px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 18px 25px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    text-decoration: none;
    transition: all 0.3s;
}

.download-btn:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-3px);
}

.download-btn .btn-icon {
    font-size: 2rem;
}

.download-btn .btn-text {
    display: flex;
    flex-direction: column;
}

.download-btn .btn-text small {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.download-btn .btn-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.download-visual {
    position: relative;
}

.device-mockup {
    position: relative;
    height: 400px;
}

.device {
    position: absolute;
    background: var(--bg-card);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.4);
}

.device.phone {
    width: 180px;
    height: 350px;
    right: 0;
    bottom: 0;
    z-index: 2;
    border: 3px solid rgba(255, 255, 255, 0.1);
}

.device.laptop {
    width: 400px;
    height: 280px;
    left: 0;
    top: 0;
    border: 3px solid rgba(255, 255, 255, 0.1);
}

.device-screen {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    padding: 20px;
}

.app-ui {
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.app-status {
    padding: 8px 20px;
    background: rgba(0, 255, 135, 0.2);
    color: var(--accent-green);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.app-location {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.app-speed {
    font-size: 0.8rem;
    color: var(--accent-cyan);
}

.app-ui.large .app-header {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.app-globe {
    width: 120px;
    height: 120px;
    border: 2px solid var(--accent-cyan);
    border-radius: 50%;
    margin-bottom: 20px;
    background: radial-gradient(circle at 30% 30%, rgba(0, 240, 255, 0.3), transparent);
}

.app-connect {
    color: var(--accent-green);
    font-size: 0.9rem;
}

/* ==========================================
   FAQ
   ========================================== */
.faq {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.faq-grid {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 15px;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    overflow: hidden;
    transition: border-color 0.3s;
}

.faq-item:hover {
    border-color: rgba(0, 240, 255, 0.3);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    cursor: pointer;
    font-weight: 600;
    transition: background 0.3s;
}

.faq-question:hover {
    background: rgba(0, 240, 255, 0.05);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--accent-cyan);
    transition: transform 0.3s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 30px 25px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ==========================================
   CTA
   ========================================== */
.cta {
    padding: 100px 0;
    background: linear-gradient(135deg, rgba(0, 240, 255, 0.1), rgba(168, 85, 247, 0.1));
    position: relative;
    overflow: hidden;
}

.cta-content {
    text-align: center;
    position: relative;
    z-index: 1;
}

.cta h2 {
    font-size: 2.8rem;
    margin-bottom: 15px;
}

.cta p {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 40px;
}

.btn-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 18px 45px;
    background: var(--gradient-button);
    color: var(--bg-primary);
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    transition: all 0.3s;
}

.btn-cta:hover {
    transform: translateY(-3px);
    box-shadow: var(--glow-cyan);
}

.cta-arrow {
    font-size: 1.5rem;
    transition: transform 0.3s;
}

.btn-cta:hover .cta-arrow {
    transform: translateX(5px);
}

.cta-decoration {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.cta-circle {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(0, 240, 255, 0.2);
}

.circle-1 {
    width: 400px;
    height: 400px;
    top: -200px;
    left: -100px;
}

.circle-2 {
    width: 300px;
    height: 300px;
    bottom: -150px;
    right: 10%;
}

.circle-3 {
    width: 200px;
    height: 200px;
    top: 20%;
    right: -50px;
}

/* ==========================================
   Footer
   ========================================== */
.footer {
    padding: 80px 0 30px;
    background: var(--bg-primary);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 80px;
    margin-bottom: 60px;
}

.footer-brand p {
    color: var(--text-secondary);
    margin: 20px 0;
    line-height: 1.8;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    font-size: 1.3rem;
    text-decoration: none;
    transition: all 0.3s;
}

.social-links a:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-3px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    font-size: 1.1rem;
    margin-bottom: 25px;
    color: var(--text-primary);
}

.footer-col a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 8px 0;
    transition: color 0.3s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==========================================
   返回顶部
   ========================================== */
.back-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-button);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    z-index: 999;
}

.back-top svg {
    width: 24px;
    height: 24px;
    color: var(--bg-primary);
}

.back-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-cyan);
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .hero-title { font-size: 3rem; }
    .globe-container { width: 350px; height: 350px; right: 5%; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .feature-card.card-large { grid-column: span 2; grid-row: span 1; }
    .pricing-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto 50px; }
    .pricing-card.featured { transform: none; }
    .download-content { grid-template-columns: 1fr; }
    .download-visual { display: none; }
}

@media (max-width: 768px) {
    .nav-links, .nav-buttons { display: none; }
    .nav-toggle { display: flex; }
    .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        padding: 30px;
        gap: 20px;
        border-bottom: 1px solid rgba(0, 240, 255, 0.1);
    }
    .hero-title { font-size: 2.5rem; }
    .hero-bg { display: none; }
    .hero-stats { flex-direction: column; gap: 15px; }
    .stat-card { width: 100%; }
    .section-title { font-size: 2rem; }
    .features-grid { grid-template-columns: 1fr; }
    .feature-card.card-large { grid-column: span 1; }
    .nodes-stats { grid-template-columns: repeat(2, 1fr); }
    .speed-display { flex-direction: column; gap: 50px; }
    .download-buttons { grid-template-columns: 1fr; }
    .footer-main { grid-template-columns: 1fr; gap: 50px; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
    .hero-title { font-size: 2rem; }
    .hero-buttons { flex-direction: column; }
    .btn-primary, .btn-secondary { width: 100%; justify-content: center; }
    .brands-section { display: none; }
    .nodes-stats { grid-template-columns: 1fr; }
    .speed-details { flex-direction: column; gap: 20px; }
    .pricing-guarantee { flex-direction: column; align-items: center; gap: 20px; }
    .footer-links { grid-template-columns: 1fr; }
}