:root {
    /* 白天模式 (Retro Arcade Vaporwave) */
    --bg-color: #f8fafc;
    --grid-color: #cbd5e1;
    --text-color: #1e293b;
    --text-muted: #475569;
    --card-bg: #ffffff;
    --border-color: #0f172a;
    --primary-color: #ec4899; /* Neon Bubblegum Pink */
    --secondary-color: #0ea5e9; /* Cyan */
    --accent-color: #facc15; /* Electric Yellow */
    --nav-bg: rgba(248, 250, 252, 0.95);
    
    --shadow-arcade: 4px 4px 0 var(--border-color);
    --shadow-arcade-hover: 6px 6px 0 var(--primary-color);
    --transition: all 0.2s cubic-bezier(0.25, 0.8, 0.25, 1);
}

[data-theme="dark"] {
    /* 夜间模式 (Pitch Violet-Black Cyberpunk) */
    --bg-color: #0b0914;
    --grid-color: rgba(236, 72, 153, 0.2);
    --text-color: #f8fafc;
    --text-muted: #94a3b8;
    --card-bg: #131022;
    --border-color: #ec4899;
    --primary-color: #ec4899;
    --secondary-color: #22d3ee;
    --accent-color: #facc15;
    --nav-bg: rgba(11, 9, 20, 0.95);
    
    --shadow-arcade: 4px 4px 0 var(--primary-color);
    --shadow-arcade-hover: 6px 6px 0 var(--accent-color), 0 0 15px var(--primary-color);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-color);
    background-image: radial-gradient(var(--grid-color) 2px, transparent 2px);
    background-size: 30px 30px;
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition), color var(--transition);
}

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

a:hover {
    color: var(--secondary-color);
}

ul { list-style: none; }

/* Arcade Header */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 0 var(--border-color);
    transition: background-color var(--transition);
    background-color: var(--nav-bg);
}

.top-arcade-bar {
    background: var(--border-color);
    color: var(--bg-color);
    padding: 0.2rem 2rem;
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: bold;
    text-transform: uppercase;
}
[data-theme="dark"] .top-arcade-bar {
    background: var(--primary-color);
    color: #fff;
    text-shadow: 0 0 5px rgba(255,255,255,0.5);
}

.arcade-badges {
    display: flex;
    gap: 1rem;
}
.badge {
    color: var(--accent-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.8rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-shadow: 2px 2px 0 var(--border-color);
}
[data-theme="dark"] .logo {
    text-shadow: 2px 2px 0 var(--secondary-color), 0 0 10px var(--primary-color);
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}
.nav-links a {
    color: var(--text-color);
    font-weight: bold;
    border-bottom: 2px solid transparent;
    padding-bottom: 2px;
}
.nav-links a:hover {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

/* Theme Toggle */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--border-color);
    cursor: pointer;
    padding: 0.4rem;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-color);
    transition: var(--transition);
    box-shadow: 2px 2px 0 var(--border-color);
}
.theme-toggle:active {
    transform: translate(2px, 2px);
    box-shadow: 0 0 0 var(--border-color);
}
.theme-toggle svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

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

/* Buttons */
.btn-arcade {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--primary-color);
    color: #fff !important;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    font-weight: 900;
    font-size: 1.1rem;
    text-align: center;
    cursor: pointer;
    box-shadow: 4px 6px 0 var(--border-color), 0 10px 15px rgba(0,0,0,0.2);
    transition: transform 0.1s, box-shadow 0.1s, background-color 0.3s;
    position: relative;
    overflow: hidden;
}
[data-theme="dark"] .btn-arcade {
    border-color: #fff;
    box-shadow: 0 6px 0 var(--accent-color), 0 0 20px var(--primary-color);
}

.btn-arcade:active {
    transform: translateY(6px);
    box-shadow: 0 0 0 var(--border-color) !important;
}

.btn-secondary {
    background-color: var(--card-bg);
    color: var(--text-color) !important;
    border-color: var(--border-color);
    box-shadow: 4px 6px 0 var(--border-color);
}
[data-theme="dark"] .btn-secondary {
    box-shadow: 4px 6px 0 var(--secondary-color);
    border-color: var(--secondary-color);
}

/* Coin particles effect on active */
.btn-arcade::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0; left: 0;
    pointer-events: none;
    background: radial-gradient(circle, rgba(255,255,255,0.4) 10%, transparent 10.01%);
    background-repeat: no-repeat;
    background-position: 50%;
    transform: scale(10, 10);
    opacity: 0;
    transition: transform .5s, opacity 1s;
}
.btn-arcade:active::after {
    transform: scale(0, 0);
    opacity: 1;
    transition: 0s;
}

/* Sections */
section {
    padding: 6rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.2rem;
    margin-bottom: 3rem;
    font-weight: 900;
    text-transform: uppercase;
    text-shadow: 3px 3px 0 var(--accent-color);
}
[data-theme="dark"] .section-title {
    text-shadow: 3px 3px 0 var(--primary-color), 0 0 10px var(--secondary-color);
    color: #fff;
}

/* Hero */
.hero {
    padding-top: 10rem;
    text-align: center;
    min-height: 85vh;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 900;
    margin-bottom: 1.5rem;
    line-height: 1.3;
    border: 4px solid var(--border-color);
    padding: 1rem 2rem;
    background: var(--card-bg);
    box-shadow: var(--shadow-arcade);
    display: inline-block;
}
[data-theme="dark"] .hero h1 {
    box-shadow: 6px 6px 0 var(--secondary-color), 0 0 20px var(--primary-color);
}

.hero .intro {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 700px;
    font-weight: bold;
    background: var(--card-bg);
    padding: 1rem;
    border: 2px solid var(--border-color);
    box-shadow: 4px 4px 0 var(--border-color);
}

.hero-actions {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

/* Latency Widget */
.latency-widget {
    background: var(--border-color);
    color: #fff;
    padding: 1rem 2rem;
    border-radius: 4px;
    margin-bottom: 2.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 15px var(--accent-color);
    cursor: crosshair;
    user-select: none;
}
.latency-value {
    font-size: 3rem;
    font-weight: 900;
    font-family: monospace;
    line-height: 1;
    color: #10b981; /* Green */
    text-shadow: 0 0 10px #10b981;
}
.latency-value .ms {
    font-size: 1.5rem;
    margin-left: 5px;
}
.latency-status {
    font-size: 1rem;
    margin-top: 0.5rem;
    font-weight: bold;
}
.latency-status .super-god {
    color: var(--accent-color);
    text-shadow: 0 0 5px var(--accent-color);
}

/* Grids */
.grid-4, .grid-3 {
    display: grid;
    gap: 2rem;
}
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

/* Arcade Cards */
.card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    padding: 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-arcade);
    transition: var(--transition);
}
.card:hover {
    transform: translate(-4px, -4px);
    box-shadow: var(--shadow-arcade-hover);
}

/* Scanline sweep effect */
.card::after {
    content: '';
    position: absolute;
    top: -100%; left: 0;
    width: 100%; height: 100%;
    background: linear-gradient(to bottom, transparent, rgba(236, 72, 153, 0.3), transparent);
    transition: top 0.4s ease-in-out;
    pointer-events: none;
}
.card:hover::after {
    top: 100%;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: inline-block;
    padding: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    background: var(--bg-color);
}
[data-theme="dark"] .card-icon {
    border-color: var(--secondary-color);
    box-shadow: 0 0 10px var(--secondary-color);
}

.card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 900;
}
.card p {
    color: var(--text-muted);
    font-weight: bold;
    font-size: 0.95rem;
}

/* Neon Borders Pulse */
@keyframes neon-pulse {
    0% { box-shadow: 0 0 5px var(--primary-color), inset 0 0 5px var(--primary-color); }
    50% { box-shadow: 0 0 20px var(--primary-color), inset 0 0 10px var(--primary-color); }
    100% { box-shadow: 0 0 5px var(--primary-color), inset 0 0 5px var(--primary-color); }
}
[data-theme="dark"] .pulse-border {
    animation: neon-pulse 2s infinite;
}

/* Pricing / Cartridges */
.price-card {
    background-color: var(--card-bg);
    border: 3px solid var(--border-color);
    padding: 3rem 2rem;
    text-align: center;
    box-shadow: var(--shadow-arcade);
    transition: var(--transition);
    position: relative;
}
.price-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-arcade-hover);
}
.price-card.featured {
    border-color: var(--primary-color);
    background: repeating-linear-gradient(45deg, transparent, transparent 10px, rgba(236, 72, 153, 0.05) 10px, rgba(236, 72, 153, 0.05) 20px), var(--card-bg);
}
.price-card.featured::before {
    content: '★ 爆款推荐 ★';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary-color);
    color: white;
    padding: 5px 20px;
    font-weight: 900;
    border: 2px solid var(--border-color);
    box-shadow: 2px 2px 0 var(--border-color);
}

.price {
    font-size: 3.5rem;
    font-weight: 900;
    margin: 1.5rem 0;
    color: var(--primary-color);
    font-family: monospace;
    text-shadow: 2px 2px 0 var(--border-color);
}
[data-theme="dark"] .price { text-shadow: 0 0 15px var(--primary-color); }

.price span {
    font-size: 1.2rem;
    color: var(--text-muted);
    text-shadow: none;
}

.price-features {
    text-align: left;
    margin: 2rem 0;
    font-weight: bold;
}
.price-features li {
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border-bottom: 1px dashed var(--grid-color);
    padding-bottom: 0.5rem;
}
.price-features li::before {
    content: "▶";
    color: var(--secondary-color);
}

/* FAQ */
.faq-item {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    margin-bottom: 1rem;
    padding: 1.5rem;
    box-shadow: 3px 3px 0 var(--border-color);
}
[data-theme="dark"] .faq-item { box-shadow: 3px 3px 0 var(--secondary-color); }

.faq-question {
    font-weight: 900;
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}
.faq-answer {
    color: var(--text-muted);
    font-weight: bold;
}

/* Reviews */
.review-card {
    text-align: left;
}
.review-stars {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    letter-spacing: 2px;
}
.review-author {
    margin-top: 1rem;
    font-weight: 900;
    font-size: 0.9rem;
    color: var(--secondary-color);
}

/* Footer */
footer {
    background-color: var(--nav-bg);
    border-top: 4px solid var(--border-color);
    padding: 4rem 2rem 2rem;
    text-align: center;
    margin-top: 4rem;
}
.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
}
.footer-links a {
    color: var(--text-color);
    font-weight: 900;
    border-bottom: 2px solid transparent;
}
.footer-links a:hover {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
}

/* Secondary Pages */
.page-header {
    padding-top: 10rem;
    text-align: center;
    margin-bottom: 3rem;
}
.page-header h1 {
    display: inline-block;
    border: 4px solid var(--border-color);
    padding: 1rem 3rem;
    background: var(--card-bg);
    box-shadow: var(--shadow-arcade);
}
.page-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem 5rem;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    box-shadow: var(--shadow-arcade);
    padding-top: 2rem;
}
.page-content h2 {
    margin: 2rem 0 1rem;
    color: var(--primary-color);
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}
.page-content p {
    margin-bottom: 1rem;
    font-weight: bold;
}
.page-content ul {
    list-style: square inside;
    margin-bottom: 1rem;
    font-weight: bold;
}

/* Responsive */
@media (max-width: 992px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 2rem; }
    .top-arcade-bar { font-size: 0.6rem; flex-direction: column; align-items: center; gap: 0.5rem; }
    .grid-3, .grid-4, .pricing-grid { grid-template-columns: 1fr; }
    .footer-links { flex-direction: column; gap: 1rem; }
    .btn-arcade { padding: 1rem 2rem; width: 100%; }
}