/* ============ 基础 ============ */
:root {
  --bg: #070b18;
  --bg-soft: #0c1326;
  --card: rgba(255, 255, 255, 0.045);
  --card-border: rgba(255, 255, 255, 0.09);
  --text: #e8ecf8;
  --text-dim: #9aa4c0;
  --accent: #6c8cff;
  --accent-2: #9a6cff;
  --accent-3: #2ee6c8;
  --radius: 18px;
}

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

html { scroll-behavior: smooth; }

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

/* ============ 背景装饰 ============ */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(108, 140, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(108, 140, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 75%);
  pointer-events: none;
  z-index: 0;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.45;
  pointer-events: none;
  z-index: 0;
}
.bg-orb-1 {
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(108, 140, 255, 0.5), transparent 70%);
  top: -120px; right: -80px;
  animation: float1 14s ease-in-out infinite;
}
.bg-orb-2 {
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(154, 108, 255, 0.4), transparent 70%);
  bottom: -140px; left: -100px;
  animation: float2 18s ease-in-out infinite;
}

@keyframes float1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(-40px, 30px) scale(1.08); }
}
@keyframes float2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  50% { transform: translate(40px, -30px) scale(1.06); }
}

header, main, footer { position: relative; z-index: 1; }

/* ============ 导航 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 24, 0.65);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.nav {
  max-width: 1120px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.brand-logo {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  font-size: 20px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 18px rgba(108, 140, 255, 0.35);
}
.brand-name { font-size: 21px; font-weight: 800; letter-spacing: 0.5px; }
.brand-accent {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav-links { display: flex; gap: 26px; }
.nav-links a {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }

/* ============ Hero ============ */
.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 96px 24px 56px;
  text-align: center;
  animation: fadeUp 0.7s ease both;
}
.hero-badge {
  display: inline-block;
  padding: 7px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--accent-3);
  background: rgba(46, 230, 200, 0.08);
  border: 1px solid rgba(46, 230, 200, 0.22);
  margin-bottom: 24px;
  letter-spacing: 0.4px;
}
.hero-title {
  font-size: clamp(38px, 6vw, 64px);
  font-weight: 800;
  letter-spacing: -1.5px;
  background: linear-gradient(120deg, #fff 20%, var(--accent) 55%, var(--accent-2) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 18px;
}
.hero-sub {
  max-width: 620px;
  margin: 0 auto 36px;
  color: var(--text-dim);
  font-size: 17px;
}
.search-box {
  position: relative;
  max-width: 560px;
  margin: 0 auto;
}
.search-icon {
  position: absolute;
  left: 20px; top: 50%;
  transform: translateY(-50%);
  width: 20px; height: 20px;
  color: var(--text-dim);
  pointer-events: none;
}
#searchInput {
  width: 100%;
  padding: 16px 20px 16px 54px;
  border-radius: 16px;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  font-size: 16px;
  outline: none;
  transition: border-color 0.25s, box-shadow 0.25s;
}
#searchInput::placeholder { color: #66708f; }
#searchInput:focus {
  border-color: rgba(108, 140, 255, 0.55);
  box-shadow: 0 0 0 4px rgba(108, 140, 255, 0.14);
}
.stat-row {
  display: flex;
  justify-content: center;
  gap: 56px;
  margin-top: 44px;
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-num {
  font-size: 26px;
  font-weight: 800;
  background: linear-gradient(90deg, var(--accent-3), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 13px; color: var(--text-dim); }

/* ============ 应用区 ============ */
.apps {
  max-width: 1120px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}
.apps-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 28px;
}
.section-title { font-size: 26px; font-weight: 700; }
.filters { display: flex; gap: 10px; flex-wrap: wrap; }
.filter-btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--card-border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-dim);
  font-size: 14px;
  cursor: pointer;
  transition: all 0.2s;
}
.filter-btn:hover { color: var(--text); border-color: rgba(108, 140, 255, 0.4); }
.filter-btn.active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border-color: transparent;
  box-shadow: 0 4px 16px rgba(108, 140, 255, 0.3);
}

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}
.app-card {
  position: relative;
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 26px 24px 22px;
  border-radius: var(--radius);
  background: var(--card);
  border: 1px solid var(--card-border);
  overflow: hidden;
  transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.2, 1), border-color 0.28s, box-shadow 0.28s;
  animation: fadeUp 0.5s ease both;
}
.app-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  opacity: 0;
  transition: opacity 0.28s;
}
.app-card:hover {
  transform: translateY(-6px);
  border-color: rgba(108, 140, 255, 0.35);
  box-shadow: 0 16px 40px rgba(6, 10, 24, 0.6), 0 0 0 1px rgba(108, 140, 255, 0.12);
}
.app-card:hover::before { opacity: 1; }

.app-icon {
  width: 54px; height: 54px;
  display: grid; place-items: center;
  font-size: 28px;
  border-radius: 14px;
  margin-bottom: 16px;
  background: rgba(108, 140, 255, 0.12);
  border: 1px solid rgba(108, 140, 255, 0.18);
}
.app-name { font-size: 19px; font-weight: 700; margin-bottom: 6px; }
.app-desc {
  color: var(--text-dim);
  font-size: 14px;
  min-height: 44px;
  margin-bottom: 14px;
}
.app-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.app-tag {
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  color: var(--accent-3);
  background: rgba(46, 230, 200, 0.08);
  border: 1px solid rgba(46, 230, 200, 0.18);
}
.app-open {
  position: absolute;
  right: 22px; bottom: 22px;
  display: flex; align-items: center; gap: 4px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
  transform: translateX(-6px);
  transition: all 0.25s;
}
.app-card:hover .app-open { opacity: 1; transform: translateX(0); }

.empty-tip {
  text-align: center;
  color: var(--text-dim);
  padding: 60px 0;
  font-size: 15px;
}

/* ============ 页脚 ============ */
.site-footer {
  text-align: center;
  padding: 28px 24px 40px;
  color: #5b6480;
  font-size: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ============ 响应式 ============ */
@media (max-width: 640px) {
  .hero { padding: 64px 20px 44px; }
  .stat-row { gap: 34px; }
  .app-grid { grid-template-columns: 1fr; }
  .nav-links a { font-size: 14px; }
}