/* Reset & Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'PingFang SC', 'Microsoft YaHei', sans-serif; background: #0a0a0a; color: #fff; line-height: 1.6; min-height: 100vh; background-image: linear-gradient(#1a1a1a 1px, transparent 1px), linear-gradient(90deg, #1a1a1a 1px, transparent 1px); background-size: 20px 20px; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* Arcade Theme Variables */
:root {
    --arc-cyan: #00ffff;
    --arc-magenta: #ff00ff;
    --arc-yellow: #ffff00;
    --arc-green: #39ff14;
    --arc-red: #ff003c;
    --arc-dark: #000000;
    --arc-card: #111111;
}

.arcade-font { font-family: 'Courier New', Courier, monospace; font-weight: bold; text-transform: uppercase; letter-spacing: 1px; }

/* Navigation */
.navbar { display: flex; justify-content: space-between; align-items: center; padding: 15px 5%; background: var(--arc-dark); border-bottom: 4px solid var(--arc-magenta); position: sticky; top: 0; z-index: 100; box-shadow: 0 4px 0 var(--arc-cyan); }
.nav-logo { font-size: 24px; color: var(--arc-yellow); text-shadow: 2px 2px 0 var(--arc-red); display: flex; align-items: center; gap: 10px; }
.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a { font-size: 16px; transition: all 0.2s; color: #fff; }
.nav-links a:hover { color: var(--arc-cyan); text-shadow: 2px 2px 0 var(--arc-magenta); }
.btn-download-nav { padding: 8px 20px; background: var(--arc-green); color: var(--arc-dark) !important; border: 2px solid #fff; box-shadow: 4px 4px 0 var(--arc-cyan); transition: transform 0.1s, box-shadow 0.1s; }
.btn-download-nav:hover { transform: translate(2px, 2px); box-shadow: 2px 2px 0 var(--arc-cyan); }

/* Hero Section */
.hero { position: relative; padding: 60px 5% 80px; text-align: center; overflow: hidden; min-height: 85vh; display: flex; flex-direction: column; justify-content: center; align-items: center; }
.hero-content { z-index: 2; max-width: 900px; margin: 0 auto; position: relative; }

/* Arcade Score Board */
.high-score-board { background: var(--arc-dark); border: 4px solid var(--arc-cyan); padding: 20px; margin-bottom: 40px; display: inline-block; box-shadow: 8px 8px 0 var(--arc-magenta); }
.blink-text { color: var(--arc-red); font-size: 24px; margin-bottom: 15px; animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.score-row { font-size: 18px; margin-bottom: 10px; text-align: left; }
.score-row span:nth-child(1) { display: inline-block; width: 100px; }
.score-row span:nth-child(3) { float: right; margin-left: 20px; }

.hero h1 { font-size: 38px; margin-bottom: 20px; color: #fff; text-shadow: 3px 3px 0 var(--arc-magenta), -3px -3px 0 var(--arc-cyan); line-height: 1.4; }
.hero p { font-size: 18px; margin-bottom: 40px; color: #ccc; }

.hero-buttons { display: flex; gap: 20px; justify-content: center; margin-bottom: 50px; flex-wrap: wrap; }
.btn-arc { padding: 15px 30px; font-size: 18px; background: var(--arc-dark); color: var(--arc-yellow); border: 4px solid var(--arc-yellow); box-shadow: 6px 6px 0 var(--arc-magenta); transition: all 0.1s; cursor: pointer; }
.btn-arc:hover { transform: translate(3px, 3px); box-shadow: 3px 3px 0 var(--arc-magenta); background: var(--arc-yellow); color: var(--arc-dark); }
.btn-pc { border-color: var(--arc-cyan); color: var(--arc-cyan); box-shadow: 6px 6px 0 var(--arc-green); }
.btn-pc:hover { background: var(--arc-cyan); color: var(--arc-dark); box-shadow: 3px 3px 0 var(--arc-green); }

.hero-images { display: flex; justify-content: center; gap: 20px; margin-top: 20px; z-index: 1; align-items: flex-end; }
.hero-images img { max-width: 30%; border: 4px solid #fff; box-shadow: 8px 8px 0 var(--arc-cyan); transition: transform 0.2s; image-rendering: pixelated; }
.hero-images img:hover { transform: translateY(-10px); box-shadow: 8px 18px 0 var(--arc-magenta); border-color: var(--arc-yellow); }

/* Features Section */
.features { padding: 80px 5%; background: var(--arc-dark); border-top: 4px dashed var(--arc-yellow); }
.section-title { text-align: center; font-size: 36px; margin-bottom: 60px; color: var(--arc-green); text-shadow: 2px 2px 0 var(--arc-magenta); }
.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; max-width: 1200px; margin: 0 auto; }
.feature-card { background: var(--arc-card); padding: 30px; border: 4px solid var(--arc-cyan); box-shadow: 6px 6px 0 var(--arc-magenta); transition: all 0.2s; text-align: center; }
.feature-card:hover { transform: translate(-4px, -4px); box-shadow: 10px 10px 0 var(--arc-yellow); border-color: var(--arc-green); }
.feature-card h3 { font-size: 22px; margin-bottom: 15px; color: var(--arc-yellow); }
.feature-card p { color: #ccc; font-size: 15px; line-height: 1.7; }

/* Blog Section */
.blog { padding: 80px 5%; background: #e0e0e0; color: var(--arc-dark); border-top: 4px solid var(--arc-magenta); background-image: linear-gradient(#ccc 1px, transparent 1px), linear-gradient(90deg, #ccc 1px, transparent 1px); background-size: 20px 20px; }
.blog .section-title { color: var(--arc-red); text-shadow: 2px 2px 0 var(--arc-dark); }
.blog-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 40px; max-width: 1200px; margin: 0 auto; }
.blog-card { background: #fff; border: 4px solid var(--arc-dark); box-shadow: 8px 8px 0 var(--arc-cyan); transition: transform 0.2s; display: flex; flex-direction: column; }
.blog-card:hover { transform: translate(-4px, -4px); box-shadow: 12px 12px 0 var(--arc-magenta); }
.blog-card img { width: 100%; height: 260px; object-fit: cover; border-bottom: 4px solid var(--arc-dark); }
.blog-content { padding: 25px; }
.blog-date { display: inline-block; background: var(--arc-dark); color: var(--arc-green); padding: 4px 10px; font-size: 14px; margin-bottom: 15px; }
.blog-content h3 { font-size: 22px; margin-bottom: 15px; color: var(--arc-dark); font-weight: bold; }
.blog-content p { color: #444; margin-bottom: 0; }
.btn-more { display: block; width: 220px; margin: 50px auto 0; text-align: center; padding: 12px; background: var(--arc-magenta); color: #fff; border: 4px solid var(--arc-dark); box-shadow: 6px 6px 0 var(--arc-yellow); transition: all 0.2s; }
.btn-more:hover { transform: translate(2px, 2px); box-shadow: 4px 4px 0 var(--arc-yellow); background: var(--arc-red); }

/* FAQ Section */
.faq { padding: 80px 5%; max-width: 900px; margin: 0 auto; }
.faq-item { background: var(--arc-card); margin-bottom: 20px; border: 4px solid var(--arc-green); box-shadow: 6px 6px 0 var(--arc-cyan); padding: 25px; transition: all 0.2s; }
.faq-item:hover { transform: translateX(5px); border-color: var(--arc-yellow); box-shadow: 6px 6px 0 var(--arc-magenta); }
.faq-question { font-size: 18px; font-weight: bold; color: var(--arc-yellow); margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
.faq-question::before { content: 'P1:'; color: var(--arc-magenta); font-family: 'Courier New', Courier, monospace; }
.faq-answer { color: #ccc; line-height: 1.8; font-size: 15px; padding-left: 45px; }

/* Footer */
.footer { background: var(--arc-dark); padding: 60px 5% 30px; border-top: 4px solid var(--arc-cyan); }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; max-width: 1200px; margin: 0 auto 40px; }
.footer-col h4 { font-size: 18px; color: var(--arc-magenta); margin-bottom: 20px; text-shadow: 1px 1px 0 #fff; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { color: #aaa; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--arc-yellow); }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 2px dashed #444; color: #666; font-size: 14px; }

/* Page specific headers */
.page-header { padding: 80px 5% 60px; text-align: center; background: var(--arc-dark); border-bottom: 4px solid var(--arc-yellow); }
.page-header h1 { font-size: 36px; color: #fff; margin-bottom: 20px; text-shadow: 3px 3px 0 var(--arc-red); line-height: 1.4; }
.page-header p { color: var(--arc-cyan); font-size: 18px; max-width: 600px; margin: 0 auto; }

/* Download Page Grid */
.download-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 30px; max-width: 1100px; margin: 60px auto; padding: 0 5%; }
.download-card { background: var(--arc-card); border: 4px solid var(--arc-magenta); padding: 40px 20px; text-align: center; box-shadow: 8px 8px 0 var(--arc-cyan); transition: all 0.2s; }
.download-card:hover { transform: translate(-4px, -4px); box-shadow: 12px 12px 0 var(--arc-yellow); border-color: var(--arc-green); }
.download-card h3 { color: var(--arc-cyan); font-size: 24px; margin-bottom: 15px; }
.download-card p { color: #ccc; margin-bottom: 30px; font-size: 15px; }
.download-card .btn-arc { display: inline-block; padding: 10px 25px; font-size: 16px; }

/* === perf: reduce motion & lower GPU cost === */
.feature-card,
.blog-card,
.hero-content,
.glass-panel,
.pearl-card {
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
}
.navbar {
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation: none !important;
        transition: none !important;
        scroll-behavior: auto !important;
    }
}

/* perf: limit decorative infinite layers on mid/low-end devices */
@media (max-width: 768px) {
    .bubble:nth-child(n+3),
    .tiny-plane:nth-child(n+3),
    .bg-shard:nth-child(n+4),
    .orb:nth-child(n+2) {
        display: none !important;
    }
}