/* 
Theme: Crypto Matrix / Neo-Brutalism
Base: Deep Black (#080a0b), Surfaces: Dark Ash (#121619), Accents: Neon Lime (#ccff00)
*/

:root {
  --bg-color: #080a0b;
  --surface-color: #121619;
  --surface-border: #22282d;
  --accent-color: #ccff00;
  --accent-hover: #b3e600;
  --text-main: #ffffff;
  --text-muted: #8b95a1;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, Courier, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; }

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

/* Utility */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-title { font-size: 32px; font-weight: 700; margin-bottom: 16px; text-align: center; }
.section-subtitle { font-size: 16px; color: var(--text-muted); text-align: center; margin-bottom: 48px; }
.highlight { color: var(--accent-color); }

/* Buttons */
.btn-primary {
  background-color: var(--accent-color);
  color: #000;
  font-weight: 700;
  font-size: 16px;
  padding: 16px 32px;
  border-radius: 4px;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-primary:hover { background-color: var(--accent-hover); transform: translateY(-2px); }
.btn-outline {
  background-color: transparent;
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  font-weight: 600;
  font-size: 14px;
  padding: 12px 24px;
  border-radius: 4px;
  transition: all 0.2s ease;
}
.btn-outline:hover { background-color: rgba(204, 255, 0, 0.1); }

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(8, 10, 11, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--surface-border);
}
.nav-container { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.nav-logo { font-family: var(--font-mono); font-size: 24px; font-weight: 800; color: var(--text-main); display: flex; align-items: center; gap: 8px;}
.nav-menu { display: flex; gap: 32px; }
.nav-link { font-size: 15px; font-weight: 500; color: var(--text-muted); transition: color 0.2s; padding: 8px 0; }
.nav-link:hover { color: var(--text-main); }
.nav-link.active { color: var(--accent-color); border-bottom: 2px solid var(--accent-color); }
.nav-toggle { display: none; background: transparent; color: white; font-size: 24px; }

/* Hero */
.hero { padding: 120px 0 80px; text-align: center; border-bottom: 1px solid var(--surface-border); background: radial-gradient(circle at 50% 0%, rgba(204, 255, 0, 0.05), transparent 50%); }
.hero-title { font-size: 56px; font-weight: 800; margin-bottom: 24px; line-height: 1.1; }
.hero-desc { font-size: 20px; color: var(--text-muted); max-width: 600px; margin: 0 auto 40px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; }

/* Features Grid */
.features { padding: 100px 0; }
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; }
.feat-card { background: var(--surface-color); border: 1px solid var(--surface-border); border-radius: 8px; padding: 32px; transition: transform 0.3s; }
.feat-card:hover { border-color: var(--accent-color); transform: translateY(-4px); }
.feat-icon { width: 48px; height: 48px; color: var(--accent-color); margin-bottom: 24px; }
.feat-title { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.feat-desc { color: var(--text-muted); font-size: 15px; }

/* Stats */
.stats { padding: 80px 0; border-top: 1px solid var(--surface-border); border-bottom: 1px solid var(--surface-border); background: var(--surface-color); }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.stat-val { font-size: 48px; font-weight: 800; font-family: var(--font-mono); color: var(--accent-color); margin-bottom: 8px; }
.stat-lbl { font-size: 14px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }

/* Download Platforms */
.platforms { padding: 100px 0; }
.plat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 24px; }
.plat-card { background: var(--surface-color); border: 1px solid var(--surface-border); border-radius: 8px; padding: 40px 24px; text-align: center; }
.plat-icon { width: 64px; height: 64px; margin: 0 auto 24px; color: var(--text-main); }
.plat-title { font-size: 24px; font-weight: 700; margin-bottom: 16px; }
.plat-req { font-size: 13px; color: var(--text-muted); margin-bottom: 24px; font-family: var(--font-mono); }

/* Deep Dives */
.deep-dive { padding: 100px 0; }
.dive-row { display: flex; align-items: center; gap: 64px; margin-bottom: 80px; }
.dive-row:nth-child(even) { flex-direction: row-reverse; }
.dive-content { flex: 1; }
.dive-title { font-size: 32px; font-weight: 800; margin-bottom: 24px; }
.dive-text { color: var(--text-muted); font-size: 16px; margin-bottom: 24px; }
.dive-visual { flex: 1; background: var(--surface-color); border: 1px solid var(--surface-border); height: 400px; border-radius: 8px; display: flex; align-items: center; justify-content: center; }

/* Reviews */
.reviews { padding: 100px 0; background: var(--surface-color); border-top: 1px solid var(--surface-border); }
.rev-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.rev-card { background: var(--bg-color); border: 1px solid var(--surface-border); padding: 24px; border-radius: 8px; }
.rev-stars { color: var(--accent-color); margin-bottom: 16px; }
.rev-text { font-size: 15px; margin-bottom: 24px; font-style: italic; }
.rev-user { display: flex; align-items: center; gap: 12px; }
.rev-avatar { width: 40px; height: 40px; background: var(--surface-border); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-weight: bold; }
.rev-info h4 { font-size: 14px; }

/* Compare */
.compare { padding: 100px 0; }
.cmp-table-wrap { overflow-x: auto; }
.cmp-table { width: 100%; border-collapse: collapse; text-align: left; }
.cmp-table th, .cmp-table td { padding: 16px; border-bottom: 1px solid var(--surface-border); }
.cmp-table th { font-weight: 700; color: var(--text-muted); }
.cmp-table td.欧易-col { background: rgba(204, 255, 0, 0.05); color: var(--accent-color); font-weight: bold; }
.cmp-icon { display: inline-block; width: 20px; height: 20px; vertical-align: middle; }

/* FAQ */
.faq { padding: 100px 0; }
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--surface-border); }
.faq-q { padding: 24px 0; font-size: 18px; font-weight: 600; cursor: pointer; display: flex; justify-content: space-between; align-items: center; }
.faq-q:hover { color: var(--accent-color); }
.faq-icon { transition: transform 0.3s; width: 24px; height: 24px; }
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-a { max-height: 0; overflow: hidden; transition: max-height 0.3s ease; }
.faq-item.open .faq-a { max-height: 500px; }
.faq-a-inner { padding-bottom: 24px; color: var(--text-muted); }

/* Download Specific */
.dl-hero { padding: 80px 0; text-align: center; }
.dl-main-card { background: var(--surface-color); border: 2px solid var(--accent-color); border-radius: 12px; padding: 48px; max-width: 800px; margin: 0 auto 64px; text-align: center; }
.dl-specs { display: flex; justify-content: center; gap: 32px; margin: 24px 0; font-family: var(--font-mono); font-size: 14px; color: var(--text-muted); }
.guide-steps { display: flex; flex-direction: column; gap: 24px; }
.step-item { display: flex; gap: 24px; background: var(--surface-color); padding: 24px; border-radius: 8px; border: 1px solid var(--surface-border); }
.step-num { font-size: 32px; font-weight: 800; font-family: var(--font-mono); color: var(--accent-color); }
.ver-list { border-left: 2px solid var(--surface-border); padding-left: 24px; margin-left: 12px; }
.ver-item { position: relative; margin-bottom: 32px; }
.ver-item::before { content: ''; position: absolute; left: -31px; top: 4px; width: 12px; height: 12px; border-radius: 50%; background: var(--accent-color); border: 2px solid var(--bg-color); }

/* Article Layout */
.article-layout { display: flex; gap: 48px; max-width: 1200px; margin: 64px auto; padding: 0 24px; }
.article-main { flex: 1; }
.article-main h2 { font-size: 28px; margin: 40px 0 20px; color: var(--accent-color); }
.article-main p { margin-bottom: 16px; font-size: 16px; color: #ccc; }
.article-sidebar { width: 320px; flex-shrink: 0; }
.sticky-box { position: sticky; top: 100px; background: var(--surface-color); border: 1px solid var(--surface-border); padding: 24px; border-radius: 8px; }
.side-btn { display: block; width: 100%; text-align: center; margin-bottom: 12px; }

/* Footer */
.footer { border-top: 1px solid var(--surface-border); padding: 48px 0; text-align: center; color: var(--text-muted); font-size: 14px; background: var(--surface-color); }
.footer-sec { margin-bottom: 16px; display: inline-flex; align-items: center; gap: 8px; color: #4ade80; font-weight: 600; }

@media (max-width: 768px) {
  .nav-menu { display: none; position: absolute; top: 70px; left: 0; width: 100%; background: var(--surface-color); flex-direction: column; padding: 24px; gap: 16px; border-bottom: 1px solid var(--surface-border); }
  .nav-menu.active { display: flex; }
  .nav-toggle { display: block; }
  .hero-title { font-size: 40px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
  .dive-row, .dive-row:nth-child(even) { flex-direction: column; gap: 32px; }
  .article-layout { flex-direction: column; }
  .article-sidebar { width: 100%; }
}