/* ============================================
   狗急加速器 - 科技感主题样式
   Bing SEO Optimized Tech Style
   ============================================ */

/* CSS Variables */
:root {
    --color-bg: #0a0e17;
    --color-bg-secondary: #0f1423;
    --color-bg-card: #131a2e;
    --color-bg-card-hover: #1a2240;
    --color-primary: #00d4ff;
    --color-primary-dark: #0099cc;
    --color-secondary: #7b2ff7;
    --color-accent: #ff6b35;
    --color-text: #e8ecf4;
    --color-text-secondary: #8b95a7;
    --color-text-muted: #5a6478;
    --color-border: rgba(0, 212, 255, 0.15);
    --color-border-hover: rgba(0, 212, 255, 0.3);
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7b2ff7 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 212, 255, 0.4) 0%, rgba(123, 47, 247, 0.4) 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 0%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(123, 47, 247, 0.08) 0%, transparent 50%);
    pointer-events: none;
    z-index: 0;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-dark);
}

ul, ol {
    list-style: none;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* ============================================
   Header & Navigation
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    transition: var(--transition-base);
}

.site-header.scrolled {
    background: rgba(10, 14, 23, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-text);
}

.logo:hover {
    color: var(--color-text);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.main-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    gap: 8px;
}

.nav-link {
    display: block;
    padding: 8px 16px;
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 0.938rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(0, 212, 255, 0.08);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 1px;
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    font-size: 0.938rem;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
    white-space: nowrap;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(0, 212, 255, 0.4);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-outline:hover {
    background: rgba(0, 212, 255, 0.1);
    transform: translateY(-2px);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
    background: rgba(255, 255, 255, 0.03);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.063rem;
    border-radius: var(--radius-lg);
}

.btn-block {
    width: 100%;
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    overflow: hidden;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
    animation: floatGlow 8s ease-in-out infinite;
}

.glow-1 {
    width: 400px;
    height: 400px;
    background: rgba(0, 212, 255, 0.3);
    top: 10%;
    left: -10%;
}

.glow-2 {
    width: 500px;
    height: 500px;
    background: rgba(123, 47, 247, 0.25);
    bottom: -10%;
    right: -10%;
    animation-delay: 2s;
}

.glow-3 {
    width: 300px;
    height: 300px;
    background: rgba(255, 107, 53, 0.15);
    top: 50%;
    right: 20%;
    animation-delay: 4s;
}

@keyframes floatGlow {
    0%, 100% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(30px, -30px) scale(1.05); }
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

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

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.stat-suffix {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    font-size: 0.813rem;
    color: var(--color-text-muted);
    margin-top: 4px;
}

/* Hero Visual - Speed Panel */
.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.speed-panel {
    width: 100%;
    max-width: 420px;
    background: linear-gradient(145deg, rgba(19, 26, 46, 0.9) 0%, rgba(15, 20, 35, 0.95) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg), inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.speed-ring {
    position: relative;
    width: 200px;
    height: 200px;
    margin: 0 auto 32px;
}

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

.ring-bg {
    fill: none;
    stroke: rgba(0, 212, 255, 0.1);
    stroke-width: 8;
}

.ring-progress {
    fill: none;
    stroke: url(#ringGradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 534;
    stroke-dashoffset: 160;
    filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.5));
}

.speed-display {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.speed-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.speed-unit {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-top: 4px;
}

.speed-label {
    font-size: 0.813rem;
    color: var(--color-text-muted);
    margin-top: 8px;
}

.speed-bars {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.speed-bar-item {
    display: grid;
    grid-template-columns: 60px 1fr 80px;
    gap: 12px;
    align-items: center;
}

.bar-label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.bar-track {
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: 4px;
    animation: fillBar 2s ease-out infinite alternate;
}

.bar-fill-1 {
    width: 90%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

.bar-fill-2 {
    width: 75%;
    background: linear-gradient(90deg, #00ff88, var(--color-primary));
}

.bar-fill-3 {
    width: 5%;
    background: linear-gradient(90deg, #00ff88, #00ff88);
}

@keyframes fillBar {
    0% { transform: scaleX(0.9); }
    100% { transform: scaleX(1); }
}

.bar-value {
    font-size: 0.875rem;
    color: var(--color-text);
    text-align: right;
    font-weight: 600;
}

/* ============================================
   Section Common
   ============================================ */
.section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.2em;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: 16px;
    padding: 4px 12px;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: 4px;
    background: rgba(0, 212, 255, 0.05);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.063rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============================================
   Features Section
   ============================================ */
.features-section {
    background: var(--color-bg-secondary);
}

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

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg);
    background: var(--color-bg-card-hover);
}

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

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--gradient-glow);
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    color: var(--color-primary);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
}

.feature-desc {
    font-size: 0.938rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================
   Core Features Section
   ============================================ */
.core-section {
    background: var(--color-bg);
}

.core-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    grid-template-rows: auto auto;
    gap: 24px;
}

.core-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
    transition: all var(--transition-base);
}

.core-item:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.core-item-large {
    grid-row: span 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.05) 0%, rgba(123, 47, 247, 0.05) 100%);
}

.core-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
    padding: 4px 12px;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 4px;
    margin-bottom: 16px;
}

.core-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--color-text);
}

.core-content p {
    font-size: 0.938rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 16px;
}

.core-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.core-list li {
    position: relative;
    padding-left: 24px;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.core-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 700;
}

.core-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.route-visual {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 20px;
}

.route-node {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.4);
    animation: pulse 2s ease-in-out infinite;
}

.route-node:nth-child(3) { animation-delay: 0.5s; }
.route-node:nth-child(5) { animation-delay: 1s; }
.route-node:nth-child(7) { animation-delay: 1.5s; }

@keyframes pulse {
    0%, 100% { transform: scale(1); box-shadow: 0 0 20px rgba(0, 212, 255, 0.4); }
    50% { transform: scale(1.1); box-shadow: 0 0 30px rgba(0, 212, 255, 0.6); }
}

.route-line {
    width: 2px;
    height: 32px;
    background: linear-gradient(to bottom, var(--color-primary), var(--color-secondary));
    opacity: 0.6;
}

/* ============================================
   Reviews Section
   ============================================ */
.reviews-section {
    background: var(--color-bg-secondary);
}

.reviews-stats {
    display: flex;
    justify-content: center;
    margin-bottom: 48px;
}

.reviews-stat {
    text-align: center;
    padding: 32px 48px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.stat-value {
    display: block;
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.stat-unit {
    color: var(--color-text-muted);
    font-size: 1.25rem;
}

.rating-stars {
    margin: 12px 0;
    font-size: 1.25rem;
    color: #ffc107;
    letter-spacing: 4px;
}

.star.half {
    background: linear-gradient(to right, #ffc107 50%, #333 50%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-count {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.review-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-base);
}

.review-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
}

.review-header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 16px;
    align-items: center;
    margin-bottom: 20px;
}

.reviewer-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    color: #fff;
}

.reviewer-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
}

.reviewer-tag {
    font-size: 0.813rem;
    color: var(--color-text-muted);
}

.review-rating {
    color: #ffc107;
    font-size: 0.875rem;
    letter-spacing: 2px;
}

.review-content {
    font-size: 0.938rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    font-style: italic;
    position: relative;
    padding-left: 16px;
    border-left: 2px solid var(--color-primary);
}

/* ============================================
   FAQ Section
   ============================================ */
.faq-section {
    background: var(--color-bg);
}

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

.faq-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item[open] {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-md);
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 28px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.063rem;
    color: var(--color-text);
    transition: color var(--transition-fast);
    list-style: none;
}

.faq-question::-webkit-details-marker {
    display: none;
}

.faq-question:hover {
    color: var(--color-primary);
}

.faq-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: 50%;
    font-size: 1.25rem;
    color: var(--color-primary);
    transition: transform var(--transition-base);
    flex-shrink: 0;
}

.faq-item[open] .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 28px 24px;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.faq-answer p {
    margin-bottom: 12px;
}

.faq-answer ul,
.faq-answer ol {
    padding-left: 20px;
    margin-bottom: 12px;
}

.faq-answer li {
    position: relative;
    padding-left: 8px;
    margin-bottom: 8px;
}

.faq-answer ol li {
    list-style: decimal;
}

.faq-answer strong {
    color: var(--color-text);
}

.faq-answer a {
    color: var(--color-primary);
    text-decoration: underline;
}

.faq-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 0.938rem;
}

.faq-table th,
.faq-table td {
    padding: 12px 16px;
    text-align: left;
    border: 1px solid var(--color-border);
}

.faq-table th {
    background: rgba(0, 212, 255, 0.1);
    color: var(--color-primary);
    font-weight: 600;
}

.faq-table td {
    color: var(--color-text-secondary);
}

/* ============================================
   Pricing Section
   ============================================ */
.pricing-section {
    background: var(--color-bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    position: relative;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-lg);
}

.pricing-card-featured {
    background: linear-gradient(145deg, rgba(0, 212, 255, 0.08) 0%, rgba(123, 47, 247, 0.08) 100%);
    border-color: var(--color-primary);
    transform: scale(1.03);
    box-shadow: 0 8px 40px rgba(0, 212, 255, 0.15);
}

.pricing-card-featured:hover {
    transform: scale(1.03) translateY(-8px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 16px;
    border-radius: 20px;
    white-space: nowrap;
}

.pricing-header {
    text-align: center;
    margin-bottom: 32px;
}

.plan-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 8px;
}

.plan-desc {
    font-size: 0.938rem;
    color: var(--color-text-muted);
}

.pricing-price {
    text-align: center;
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--color-border);
}

.price-currency {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-secondary);
    vertical-align: top;
}

.price-amount {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
}

.price-period {
    font-size: 0.938rem;
    color: var(--color-text-muted);
}

.pricing-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
    flex-grow: 1;
}

.pricing-features li {
    position: relative;
    padding-left: 28px;
    font-size: 0.938rem;
    color: var(--color-text-secondary);
}

.pricing-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-primary);
    font-weight: 700;
}

/* ============================================
   Guide Section
   ============================================ */
.guide-section {
    background: var(--color-bg);
}

.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 48px;
    max-width: 1000px;
    margin: 0 auto;
}

.guide-step {
    display: grid;
    grid-template-columns: 60px 1fr 1fr;
    gap: 32px;
    align-items: start;
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    position: sticky;
    top: 120px;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text);
}

.step-content p {
    font-size: 0.938rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.step-tips {
    background: rgba(0, 212, 255, 0.08);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-md);
    padding: 16px 20px;
}

.step-tips span {
    display: block;
    font-size: 0.813rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 4px;
}

.step-tips p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin: 0;
}

/* Mock Windows */
.step-visual {
    display: flex;
    align-items: center;
}

.mock-window {
    width: 100%;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.mock-title-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--color-border);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot-red { background: #ff5f56; }
.dot-yellow { background: #ffbd2e; }
.dot-green { background: #27c93f; }

.mock-title {
    font-size: 0.813rem;
    color: var(--color-text-muted);
    margin-left: 8px;
}

.mock-body {
    padding: 32px;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Install Mock */
.mock-install {
    width: 100%;
    text-align: center;
}

.install-progress {
    width: 100%;
    height: 8px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
}

.install-bar {
    width: 65%;
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    animation: progress 3s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 60%; }
    50% { width: 70%; }
    100% { width: 65%; }
}

.install-text {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* Login Mock */
.mock-login {
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-fields {
    width: 100%;
    max-width: 240px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.login-input {
    height: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    padding: 0 16px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.login-btn {
    height: 40px;
    background: var(--gradient-primary);
    color: #fff;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.938rem;
    margin-top: 8px;
}

/* Games Mock */
.mock-games {
    display: flex;
    align-items: center;
    justify-content: center;
}

.game-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
    width: 100%;
}

.game-card {
    aspect-ratio: 1;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.game-1 { background: linear-gradient(135deg, #ff6b35, #c1272d); }
.game-2 { background: linear-gradient(135deg, #4facfe, #00f2fe); }
.game-3 { background: linear-gradient(135deg, #667eea, #764ba2); }
.game-4 { background: linear-gradient(135deg, #00d4ff, #0099cc); }

/* Accelerating Mock */
.mock-accelerating {
    flex-direction: column;
    gap: 24px;
}

.accel-status {
    display: flex;
    align-items: center;
    gap: 12px;
}

.accel-pulse {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #00ff88;
    box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.7);
    animation: accelPulse 1.5s ease-out infinite;
}

@keyframes accelPulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0.7); }
    70% { box-shadow: 0 0 0 16px rgba(0, 255, 136, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 136, 0); }
}

.accel-text {
    font-size: 1.125rem;
    font-weight: 700;
    color: #00ff88;
}

.accel-metrics {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.metric {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: 8px 16px;
    background: rgba(0, 255, 136, 0.1);
    border: 1px solid rgba(0, 255, 136, 0.2);
    border-radius: var(--radius-sm);
}

/* ============================================
   About Section
   ============================================ */
.about-section {
    background: var(--color-bg-secondary);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-content .section-title {
    text-align: left;
}

.about-text {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: 40px;
}

.about-feature {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.about-feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--gradient-glow);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    flex-shrink: 0;
}

.about-feature h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 4px;
}

.about-feature p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.contact-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 36px;
}

.contact-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.contact-list li {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 16px;
    align-items: start;
}

.contact-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.contact-list a {
    font-size: 0.938rem;
    color: var(--color-text);
    word-break: break-all;
}

.contact-list a:hover {
    color: var(--color-primary);
}

.contact-social {
    display: flex;
    gap: 12px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 212, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: #fff;
    transform: translateY(-2px);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding-top: 64px;
}

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

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-desc {
    font-size: 0.938rem;
    color: var(--color-text-muted);
    line-height: 1.7;
    max-width: 300px;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 20px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-col ul li a {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer-col ul li a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p {
    font-size: 0.813rem;
    color: var(--color-text-muted);
}

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

.footer-bottom-links a {
    font-size: 0.813rem;
    color: var(--color-text-muted);
}

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

/* ============================================
   Back to Top
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.4);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 30px rgba(0, 212, 255, 0.5);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.75rem;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .core-item-large {
        grid-column: span 2;
        grid-row: auto;
        grid-template-columns: 1fr;
    }

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

    .guide-step {
        grid-template-columns: 50px 1fr;
    }

    .step-visual {
        grid-column: span 2;
    }
}

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

    .hero {
        padding-top: 100px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .hero-visual {
        order: -1;
    }

    .speed-panel {
        max-width: 360px;
        margin: 0 auto;
    }

    .section {
        padding: 64px 0;
    }

    .section-title {
        font-size: 1.875rem;
    }

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

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

    .core-item-large {
        grid-column: auto;
    }

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

    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .pricing-card-featured {
        transform: none;
    }

    .pricing-card-featured:hover {
        transform: translateY(-8px);
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-content .section-title {
        text-align: left;
    }

    .guide-step {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .step-number {
        position: static;
        font-size: 2rem;
    }

    .step-visual {
        grid-column: auto;
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .footer-bottom-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.875rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    .nav-actions .btn-ghost {
        display: none;
    }
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* ============================================
   Scrollbar
   ============================================ */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(var(--color-primary), var(--color-secondary));
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(var(--color-primary-dark), var(--color-secondary));
}

/* ============================================
   Selection
   ============================================ */
::selection {
    background: rgba(0, 212, 255, 0.3);
    color: var(--color-text);
}

/* ============================================
   Focus States
   ============================================ */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
    border-radius: 4px;
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}