/* ==========================================================
   DAOAN // 道安 · 站点总控台
   base.css — 设计令牌 / 布局 / 排版
   ========================================================== */

:root {
  --bg: #04060c;
  --bg-soft: #080d18;
  --panel: rgba(14, 21, 36, 0.72);
  --panel-line: rgba(120, 180, 255, 0.14);
  --txt: #e8f0ff;
  --txt-dim: #8b9cba;
  --cyan: #35e6ff;
  --violet: #a06bff;
  --gold: #ffc861;
  --green: #4dffa6;
  --red: #ff5c7a;
  --radius: 18px;
  --maxw: 1180px;
  --font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

html[data-theme="light"] {
  --bg: #f4f7fc;
  --bg-soft: #eaf0fa;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-line: rgba(20, 60, 120, 0.12);
  --txt: #0d1728;
  --txt-dim: #5a6a85;
  --cyan: #0aa8c4;
  --violet: #6b3ce0;
  --gold: #b7791f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font-family: var(--font);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(1100px 700px at 78% -8%, rgba(53, 230, 255, 0.10), transparent 60%),
    radial-gradient(900px 620px at 8% 8%, rgba(160, 107, 255, 0.10), transparent 62%),
    radial-gradient(800px 800px at 50% 110%, rgba(255, 200, 97, 0.06), transparent 64%);
}

#fx-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.cursor-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  left: 0; top: 0;
  margin: -210px 0 0 -210px;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle, rgba(53, 230, 255, 0.12), rgba(160, 107, 255, 0.06) 42%, transparent 68%);
  transition: opacity .4s;
  will-change: transform;
}

.page {
  position: relative;
  z-index: 1;
}

.wrap {
  width: min(var(--maxw), calc(100% - 48px));
  margin: 0 auto;
}

/* ---------- 顶部导航 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--panel-line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: .14em;
  font-size: 15px;
  color: var(--txt);
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 30px; height: 30px;
  display: grid; place-items: center;
  border-radius: 9px;
  border: 1px solid rgba(53, 230, 255, .45);
  background: linear-gradient(145deg, rgba(53,230,255,.20), rgba(160,107,255,.22));
  box-shadow: 0 0 22px rgba(53, 230, 255, .28) inset, 0 0 14px rgba(53,230,255,.16);
  font-size: 15px;
  color: var(--cyan);
}

.nav-links {
  display: flex;
  gap: 4px;
  margin-left: auto;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--txt-dim);
  text-decoration: none;
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 999px;
  transition: color .25s, background .25s;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--txt);
  background: rgba(120, 180, 255, .10);
}

.theme-btn {
  width: 36px; height: 36px;
  border-radius: 50%;
  border: 1px solid var(--panel-line);
  background: transparent;
  color: var(--txt-dim);
  cursor: pointer;
  font-size: 15px;
  display: grid; place-items: center;
  transition: transform .3s var(--ease), color .25s;
}
.theme-btn:hover { color: var(--cyan); transform: rotate(35deg); }

/* ---------- 通用排版 ---------- */
section { padding: 88px 0; position: relative; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--cyan);
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan));
}

h1, h2, h3 { line-height: 1.22; margin: 0 0 18px; letter-spacing: -.01em; }
h1 { font-size: clamp(38px, 6.4vw, 78px); font-weight: 900; }
h2 { font-size: clamp(26px, 3.4vw, 40px); font-weight: 800; }
h3 { font-size: 18px; font-weight: 700; }

p { color: var(--txt-dim); margin: 0 0 16px; }

.lede { font-size: clamp(15px, 1.5vw, 18px); color: var(--txt-dim); max-width: 62ch; }

.grad-text {
  background: linear-gradient(100deg, var(--cyan), var(--violet) 42%, var(--gold) 78%, var(--cyan));
  background-size: 300% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradShift 9s linear infinite;
}
@keyframes gradShift { to { background-position: 300% 0; } }

.mono { font-family: var(--mono); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  color: #04121a;
  background: linear-gradient(120deg, var(--cyan), #7ce9ff);
  border: 1px solid transparent;
  box-shadow: 0 12px 34px rgba(53, 230, 255, .22);
  transition: transform .35s var(--ease), box-shadow .35s;
  cursor: pointer;
}
.btn:hover { transform: translateY(-3px); box-shadow: 0 18px 44px rgba(53, 230, 255, .34); }

.btn.ghost {
  background: transparent;
  color: var(--txt);
  border: 1px solid var(--panel-line);
  box-shadow: none;
}
.btn.ghost:hover { border-color: rgba(53, 230, 255, .5); color: var(--cyan); }

/* ---------- 面板 ---------- */
.panel {
  background: var(--panel);
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--panel-line);
  padding: 44px 0 60px;
  margin-top: 40px;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  color: var(--txt-dim);
  font-size: 13px;
}
.footer a { color: var(--txt-dim); text-decoration: none; }
.footer a:hover { color: var(--cyan); }

/* ---------- 动画入场 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s var(--ease), transform .8s var(--ease);
  transition-delay: var(--d, 0ms);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; }
  .grad-text { animation: none; }
  html { scroll-behavior: auto; }
}

@media (max-width: 760px) {
  .wrap { width: calc(100% - 32px); }
  section { padding: 64px 0; }
  .nav-inner { height: 60px; gap: 12px; }
  .nav-links a { padding: 7px 10px; font-size: 13px; }
}