/* ==========================================================================
   天使会 · 官网与下载页共用样式
   令牌来源：app/contract/tokens.json（与 Android/iOS 同一份事实源）
   规则：不写死色值、不用 emoji 图标、不用紫→粉渐变、不用弹跳缓动
   ========================================================================== */

:root {
  /* brand */
  --brand-900: #0A1F3C;
  --brand-800: #0E2B54;
  --brand-700: #123C74;
  --brand-600: #1A4D96;
  --brand-500: #2A64B8;
  --brand-400: #5A8DD4;
  --brand-300: #93B5E6;
  --brand-200: #C4D8F2;
  --brand-050: #F2F6FC;

  /* accent（金，仅用于价值锚点/付费语义） */
  --accent-700: #8A5A10;
  --accent-600: #B87A1E;
  --accent-500: #D49A34;
  --accent-200: #F6E6C6;
  --accent-050: #FDF6E9;

  /* 语义 */
  --success: #1A7F4B;
  --success-bg: #E6F4EC;
  --warning: #B46A08;
  --warning-bg: #FDF1DF;
  --danger: #C62828;
  --info: #0E6E8C;
  --info-bg: #E4F2F7;

  /* 中性 */
  --n-900: #111827;
  --n-700: #374151;
  --n-500: #6B7280;
  --n-400: #9CA3AF;
  --n-300: #D1D5DB;
  --n-200: #E5E7EB;
  --n-100: #F3F4F6;
  --n-050: #F9FAFB;
  --white: #FFFFFF;

  /* dark（官网主视觉） */
  --d-bg: #0B1220;
  --d-surface: #131C2E;
  --d-raised: #1B2740;
  --d-border: #263349;
  --d-text: #F1F5F9;
  --d-text-2: #A8B4C7;
  --d-text-3: #71809A;

  /* 排版与节奏 */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;

  --r-sm: 6px;
  --r-md: 10px;
  --r-lg: 14px;
  --r-xl: 18px;
  --r-pill: 999px;

  --wrap: 1180px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.32, 0.72, 0, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--d-bg);
  color: var(--d-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

/* 背景光：低饱和、克制，不用紫粉 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(900px 480px at 78% -8%, rgba(42, 100, 184, 0.20), transparent 70%),
    radial-gradient(760px 420px at 6% 4%, rgba(212, 154, 52, 0.10), transparent 72%);
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

h1, h2, h3, h4, p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--brand-400);
  outline-offset: 3px;
  border-radius: 4px;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* ---------------- 顶部导航 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: rgba(11, 18, 32, 0.82);
  border-bottom: 1px solid var(--d-border);
}

.nav-in {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 0 24px;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  gap: 22px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: 0.2px;
  flex: 0 0 auto;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--brand-600), var(--brand-800));
  border: 1px solid rgba(212, 154, 52, 0.45);
  display: grid;
  place-items: center;
  color: var(--accent-200);
  font-size: 15px;
  font-weight: 800;
}

.brand-sub {
  font-size: 11px;
  color: var(--d-text-3);
  font-weight: 500;
  letter-spacing: 0.4px;
}

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

.nav-links a {
  font-size: 13.5px;
  color: var(--d-text-2);
  padding: 8px 12px;
  border-radius: var(--r-md);
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}

.nav-links a:hover {
  color: var(--d-text);
  background: var(--d-surface);
}

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  font-weight: 600;
  padding: 12px 20px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease),
    border-color 0.18s var(--ease), color 0.18s var(--ease);
  font-family: inherit;
  white-space: nowrap;
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--accent-500);
  color: var(--brand-900);
  box-shadow: 0 10px 26px rgba(212, 154, 52, 0.22);
}

.btn-primary:hover {
  background: #E0AC4E;
}

.btn-ghost {
  background: transparent;
  color: var(--d-text);
  border-color: var(--d-border);
}

.btn-ghost:hover {
  border-color: var(--brand-400);
  color: var(--white);
}

.btn-sm {
  font-size: 13px;
  padding: 9px 15px;
  border-radius: 9px;
}

.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
}

/* ---------------- 通用块 ---------------- */
section {
  padding: 76px 0;
  position: relative;
  z-index: 1;
}

.sec-head {
  max-width: 720px;
  margin-bottom: 34px;
}

.kicker {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2.2px;
  color: var(--brand-300);
  text-transform: uppercase;
}

h2 {
  font-size: 30px;
  line-height: 1.28;
  font-weight: 750;
  margin: 10px 0 12px;
  letter-spacing: -0.3px;
}

.sec-head p {
  color: var(--d-text-2);
  font-size: 15px;
}

.card {
  background: var(--d-surface);
  border: 1px solid var(--d-border);
  border-radius: var(--r-lg);
  padding: 22px;
}

.grid {
  display: grid;
  gap: 16px;
}

.g2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.icon-box {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  background: rgba(90, 141, 212, 0.12);
  border: 1px solid rgba(90, 141, 212, 0.28);
  color: var(--brand-300);
  margin-bottom: 14px;
}

.icon-box svg {
  width: 20px;
  height: 20px;
}

.card h3 {
  font-size: 16px;
  font-weight: 650;
  margin-bottom: 6px;
}

.card p {
  color: var(--d-text-2);
  font-size: 13.5px;
  line-height: 1.68;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 11.5px;
  padding: 4px 10px;
  border-radius: var(--r-pill);
  border: 1px solid var(--d-border);
  color: var(--d-text-2);
  background: var(--d-raised);
}

.chip-accent {
  color: var(--accent-200);
  border-color: rgba(212, 154, 52, 0.45);
  background: rgba(212, 154, 52, 0.10);
}

.chip-ok {
  color: #8EE3BF;
  border-color: rgba(70, 211, 154, 0.40);
  background: rgba(70, 211, 154, 0.10);
}

.divider {
  height: 1px;
  background: var(--d-border);
  border: 0;
  margin: 0;
}

/* ---------------- 页脚 ---------------- */
.footer {
  border-top: 1px solid var(--d-border);
  padding: 40px 0 56px;
  position: relative;
  z-index: 1;
}

.footer-in {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  align-items: flex-start;
  justify-content: space-between;
}

.footer-note {
  color: var(--d-text-3);
  font-size: 12px;
  line-height: 1.8;
  max-width: 560px;
}

.footer-links {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--d-text-2);
}

.footer-links a:hover {
  color: var(--d-text);
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 1024px) {
  .g4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .g3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .nav-links { display: none; }
  section { padding: 56px 0; }
  h2 { font-size: 25px; }
  .g2, .g3, .g4 { grid-template-columns: 1fr; }
}

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