:root {
  --bg: #070b14;
  --bg-soft: #0c1322;
  --card: rgba(255, 255, 255, 0.055);
  --card-border: rgba(255, 255, 255, 0.09);
  --text: #eef2f9;
  --text-dim: #9aa7bd;
  --accent: #6ea8fe;
  --accent-2: #b18cff;
  --accent-3: #5eead4;
  --green: #4ade80;
  --radius: 18px;
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.45);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ---------- background ---------- */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(110px);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}
.bg-glow-a { width: 560px; height: 560px; top: -180px; left: -120px; background: #2b5cff; }
.bg-glow-b { width: 480px; height: 480px; top: 320px; right: -140px; background: #8b3cff; }

main { position: relative; z-index: 1; max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---------- glass ---------- */
.glass {
  background: var(--card);
  border: 1px solid var(--card-border);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ---------- nav ---------- */
.nav {
  position: sticky;
  top: 16px;
  z-index: 50;
  max-width: 1080px;
  margin: 16px auto 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  border-radius: 16px;
}

.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-logo { width: 34px; height: 34px; border-radius: 9px; }
.brand-name { font-weight: 700; font-size: 18px; letter-spacing: 0.3px; }
.brand-dot { color: var(--accent-3); }

.nav-links { display: flex; gap: 6px; align-items: center; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  padding: 7px 14px;
  border-radius: 10px;
  font-size: 14.5px;
  transition: all 0.2s ease;
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.07); }

/* ---------- hero ---------- */
.hero { text-align: center; padding: 96px 0 40px; }

.hero-badge {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--text-dim);
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--card-border);
  margin-bottom: 22px;
}

.hero-title {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 800;
  letter-spacing: -0.5px;
  line-height: 1.15;
}

.gradient-text {
  background: linear-gradient(100deg, var(--accent), var(--accent-2) 55%, var(--accent-3));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub { color: var(--text-dim); font-size: 17px; margin-top: 18px; max-width: 560px; margin-inline: auto; }

.hero-actions { display: flex; gap: 14px; justify-content: center; margin-top: 34px; flex-wrap: wrap; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-size: 15.5px;
  font-weight: 600;
  padding: 13px 26px;
  border-radius: 13px;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn:active { transform: translateY(1px) scale(0.99); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  box-shadow: 0 10px 30px rgba(110, 168, 254, 0.35);
}
.btn-primary:hover { box-shadow: 0 14px 40px rgba(110, 168, 254, 0.5); transform: translateY(-2px); }

.btn-ghost {
  color: var(--text);
  background: rgba(255,255,255,0.07);
  border: 1px solid var(--card-border);
}
.btn-ghost:hover { background: rgba(255,255,255,0.12); }
.btn-sm { padding: 9px 18px; font-size: 14px; border-radius: 10px; }
.btn-icon { font-size: 18px; line-height: 1; }

/* ---------- featured app card ---------- */
.featured { padding: 48px 0 20px; }

.app-card {
  display: flex;
  gap: 30px;
  padding: 34px;
  align-items: flex-start;
}

.app-card-left { flex-shrink: 0; }
.app-icon { width: 96px; height: 96px; border-radius: 24px; box-shadow: 0 12px 36px rgba(0,0,0,0.5); }

.app-meta { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.app-meta h2 { font-size: 26px; font-weight: 800; }
.app-en { color: var(--text-dim); font-weight: 500; font-size: 17px; }

.tag {
  font-size: 12.5px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--card-border);
  color: var(--text-dim);
}
.tag-green { color: #6ff0a8; border-color: rgba(74,222,128,0.35); background: rgba(74,222,128,0.1); }
.tag-free { color: #ffd58a; border-color: rgba(255,200,120,0.3); background: rgba(255,200,120,0.08); }

.app-desc { color: var(--text-dim); margin-top: 14px; font-size: 15.5px; max-width: 620px; }

.app-features { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 16px; color: var(--text); font-size: 14px; }
.app-features span { opacity: 0.9; }

.app-actions { display: flex; gap: 12px; margin-top: 24px; flex-wrap: wrap; }

/* ---------- downloads ---------- */
.downloads { padding: 56px 0 20px; }
.section-title { font-size: 30px; font-weight: 800; text-align: center; }
.section-sub { text-align: center; color: var(--text-dim); margin: 10px 0 30px; }

.dl-table { overflow: hidden; }
.dl-row {
  display: grid;
  grid-template-columns: 2.2fr 0.7fr 1.2fr 0.7fr 0.9fr;
  align-items: center;
  gap: 12px;
  padding: 18px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 14.5px;
}
.dl-row:last-child { border-bottom: none; }
.dl-head { color: var(--text-dim); font-size: 13px; text-transform: uppercase; letter-spacing: 0.6px; }
.dl-name { display: flex; align-items: center; gap: 12px; font-weight: 600; }
.dl-icon { width: 32px; height: 32px; border-radius: 8px; }
.pill {
  display: inline-block;
  font-size: 12.5px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(110,168,254,0.12);
  border: 1px solid rgba(110,168,254,0.3);
  color: #a9c8ff;
}
.dl-empty { display: block; text-align: center; color: var(--text-dim); padding: 20px; }

.checksum { margin-top: 18px; padding: 16px 22px; }
.checksum summary { cursor: pointer; color: var(--text-dim); font-size: 14px; user-select: none; }
.checksum code {
  display: block;
  margin-top: 12px;
  font-family: Consolas, monospace;
  font-size: 13px;
  color: var(--accent-3);
  word-break: break-all;
  user-select: all;
}

/* ---------- screenshots ---------- */
.screenshots { padding: 56px 0 20px; }
.shot-frame { padding: 14px; margin-top: 26px; overflow: hidden; }
.shot-img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}

/* ---------- features ---------- */
.features { padding: 56px 0 20px; }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; margin-top: 26px; }
.feature-card { padding: 26px; transition: transform 0.2s ease, border-color 0.2s ease; }
.feature-card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,0.2); }
.feature-icon { font-size: 30px; }
.feature-card h3 { margin-top: 14px; font-size: 17px; }
.feature-card p { color: var(--text-dim); font-size: 14px; margin-top: 8px; }

/* ---------- about ---------- */
.about { padding: 56px 0 80px; }
.about-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; margin-top: 26px; }
.about-card { padding: 24px; }
.about-card h3 { font-size: 16px; }
.about-card p { color: var(--text-dim); font-size: 14px; margin-top: 10px; }

/* ---------- footer ---------- */
.footer { position: relative; z-index: 1; border-top: 1px solid rgba(255,255,255,0.07); margin-top: 20px; }
.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 26px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  color: var(--text-dim);
  font-size: 13.5px;
}
.footer-links a { color: var(--text-dim); text-decoration: none; }
.footer-links a:hover { color: var(--text); }
.sep { opacity: 0.5; margin: 0 6px; }

/* ---------- toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 34px;
  transform: translateX(-50%) translateY(20px);
  background: rgba(20, 28, 46, 0.92);
  border: 1px solid var(--card-border);
  color: var(--text);
  padding: 12px 22px;
  border-radius: 12px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.3s ease;
  z-index: 100;
  backdrop-filter: blur(10px);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- responsive ---------- */
@media (max-width: 820px) {
  .app-card { flex-direction: column; align-items: center; text-align: center; padding: 26px 20px; }
  .app-desc { margin-inline: auto; }
  .app-actions, .app-features { justify-content: center; }
  .dl-row { grid-template-columns: 1.6fr 0.6fr 1fr 0.6fr 0.8fr; padding: 14px 16px; font-size: 13px; }
  .footer-inner { justify-content: center; text-align: center; }
}

@media (max-width: 600px) {
  .nav-links a { padding: 6px 9px; font-size: 13px; }
  .dl-head { display: none; }
  .dl-row { grid-template-columns: 1fr 1fr; }
  .dl-row .dl-name { grid-column: 1 / -1; }
  .hero { padding-top: 64px; }
}

/* ---------- reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.visible { opacity: 1; transform: none; }