/* Hikari-Bot 官网 — 深色科技风
   基底：深夜蓝  主光：青色  辅光：紫色  全站零外部依赖 */

:root {
  --bg-0: #070b1a;
  --bg-1: #0b1026;
  --text: #e8ecff;
  --muted: #97a0c4;
  --cyan: #67e8f9;
  --cyan-deep: #22d3ee;
  --violet: #a78bfa;
  --violet-deep: #8b5cf6;
  --card-bg: rgba(255, 255, 255, 0.04);
  --card-border: rgba(255, 255, 255, 0.09);
  --radius: 16px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC",
    -apple-system, "Segoe UI", Roboto, sans-serif;
  background: linear-gradient(160deg, var(--bg-1) 0%, var(--bg-0) 55%, #0a0f22 100%);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ---------- 背景：星空 + 极光 ---------- */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.stars {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(1px 1px at 12% 22%, rgba(255,255,255,.85) 50%, transparent 51%),
    radial-gradient(1px 1px at 32% 68%, rgba(255,255,255,.55) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 55% 12%, rgba(255,255,255,.75) 50%, transparent 51%),
    radial-gradient(1px 1px at 71% 45%, rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1.5px 1.5px at 84% 76%, rgba(255,255,255,.7) 50%, transparent 51%),
    radial-gradient(1px 1px at 93% 18%, rgba(255,255,255,.6) 50%, transparent 51%),
    radial-gradient(1px 1px at 6% 82%, rgba(255,255,255,.5) 50%, transparent 51%),
    radial-gradient(1px 1px at 46% 88%, rgba(255,255,255,.45) 50%, transparent 51%);
  animation: twinkle 5s ease-in-out infinite alternate;
}

@keyframes twinkle {
  from { opacity: .55; }
  to   { opacity: 1; }
}

.aurora {
  position: absolute;
  width: 55vw;
  height: 55vw;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .22;
}

.aurora-cyan {
  background: radial-gradient(circle, var(--cyan-deep), transparent 65%);
  top: -22vw; right: -14vw;
}

.aurora-violet {
  background: radial-gradient(circle, var(--violet-deep), transparent 65%);
  bottom: -26vw; left: -16vw;
}

/* ---------- 顶部导航 ---------- */
.nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
}

.brand-mark {
  color: var(--cyan);
  font-size: 22px;
  text-shadow: 0 0 14px rgba(103, 232, 249, .8);
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: .5px;
}

.brand-name i {
  font-style: normal;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-doc {
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  padding: 8px 16px;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  transition: color .2s, border-color .2s, box-shadow .2s;
}

.nav-doc:hover {
  color: var(--cyan);
  border-color: rgba(103, 232, 249, .45);
  box-shadow: 0 0 18px rgba(34, 211, 238, .18);
}

/* ---------- 主视觉 ---------- */
main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  text-align: center;
  padding: 108px 0 84px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  padding: 7px 16px;
  border-radius: 999px;
  margin-bottom: 30px;
}

.badge .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: .5; transform: scale(.8); }
}

.title {
  font-size: clamp(38px, 6.4vw, 62px);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: 1px;
}

.title em {
  font-style: normal;
  background: linear-gradient(92deg, var(--cyan) 5%, var(--violet) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 22px rgba(103, 232, 249, .35));
}

.subtitle {
  max-width: 560px;
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 16.5px;
}

.cta-row {
  margin-top: 42px;
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 13px 32px;
  border-radius: 999px;
  font-size: 15.5px;
  text-decoration: none;
  transition: transform .2s, box-shadow .2s, background .2s, border-color .2s;
}

.btn-primary {
  color: #04101c;
  font-weight: 700;
  background: linear-gradient(92deg, var(--cyan), var(--violet));
  box-shadow: 0 4px 26px rgba(34, 211, 238, .35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 34px rgba(139, 92, 246, .45);
}

.btn-ghost {
  color: var(--text);
  border: 1px solid var(--card-border);
  background: var(--card-bg);
}

.btn-ghost:hover {
  border-color: rgba(167, 139, 250, .5);
  transform: translateY(-2px);
}

/* ---------- 特性卡片 ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-bottom: 96px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 30px 26px;
  backdrop-filter: blur(8px);
  transition: transform .25s, border-color .25s, box-shadow .25s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: rgba(103, 232, 249, .4);
  box-shadow: 0 14px 38px rgba(2, 8, 26, .6), 0 0 24px rgba(34, 211, 238, .12);
}

.card-icon {
  font-size: 30px;
  margin-bottom: 14px;
}

.card h2 {
  font-size: 18px;
  margin-bottom: 8px;
  letter-spacing: .5px;
}

.card p {
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid rgba(255, 255, 255, .07);
  padding: 30px 24px 38px;
  text-align: center;
  color: var(--muted);
  font-size: 13.5px;
}

.footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px dashed rgba(151, 160, 196, .5);
  transition: color .2s;
}

.footer a:hover { color: var(--cyan); }

.beian { margin-top: 6px; font-size: 12.5px; }

/* ---------- 响应式 ---------- */
@media (max-width: 760px) {
  .features { grid-template-columns: 1fr; }
  .hero { padding: 76px 0 60px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}