/* ============================================================
 * theme.css — 全站设计变量与公共组件
 * 风格依据：白底 + 亮紫主色 #7c5cfc + 紫蓝渐变按钮
 *           黄/蓝/绿/粉糖果点缀 + 大圆角 + 柔和阴影
 * ============================================================ */

:root {
  /* 配色 */
  --bg: #ffffff;
  --bg-soft: #f8f9fd;
  --surface: #ffffff;
  --ink: #21252d;
  --ink-2: #6f7486;
  --ink-3: #a9aebf;
  --primary: #7c5cfc;
  --primary-dark: #6a48f0;
  --primary-soft: #f1edff;
  --primary-line: #ddd4ff;
  --grad-primary: linear-gradient(135deg, #8a5cfc 0%, #5b8def 100%);
  --grad-logo: linear-gradient(135deg, #7c5cfc, #f783ac);
  --dark: #21252d;
  --accent-purple: #c9b8ff;
  --accent-blue: #4dabf7;
  --accent-yellow: #ffd43b;
  --accent-green: #51cf66;
  --accent-pink: #f783ac;
  --accent-orange: #ff922b;
  --accent-mint: #8fd9b5;
  --accent-coral: #f6a294;
  --accent-sky: #a8d8f0;
  --accent-lime: #ffe066;
  --danger: #ef6b5e;
  --ok: #40c057;

  /* 圆角 */
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;

  /* 阴影 */
  --shadow-card: 0 6px 26px rgba(124, 92, 252, .09);
  --shadow-pop: 0 14px 38px rgba(76, 88, 175, .18);
  --shadow-soft: 0 2px 10px rgba(33, 37, 45, .05);

  /* 字体 */
  --font: "PingFang SC", "Microsoft YaHei", "微软雅黑", system-ui, sans-serif;

  /* 间距节奏 */
  --gap-xs: 6px;
  --gap-sm: 12px;
  --gap-md: 20px;
  --gap-lg: 32px;
  --gap-xl: 56px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
button { font-family: var(--font); cursor: pointer; }

/* ===== 顶部导航 ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, .92);
  backdrop-filter: blur(14px);
  padding: 14px clamp(16px, 4vw, 48px);
  display: flex;
  align-items: center;
  gap: var(--gap-md);
}
.nav .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 900;
  color: var(--ink);
  letter-spacing: .5px;
}
.nav .logo .logo-mark {
  width: 34px; height: 34px;
  border-radius: 10px;
  background: var(--grad-logo);
  display: inline-flex; align-items: center; justify-content: center;
  color: #fff; font-size: 16px; font-weight: 900;
  box-shadow: 0 4px 14px rgba(124, 92, 252, .35);
}
.nav .links { display: flex; gap: 6px; margin-left: auto; align-items: center; }
.nav .links a {
  padding: 8px 18px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-2);
  transition: all .18s;
}
.nav .links a:hover { color: var(--primary); background: var(--primary-soft); }
.nav .links a.active {
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 800;
}
.nav .links a.nav-cta {
  background: var(--grad-primary);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 6px 16px rgba(124, 92, 252, .35);
}
.nav .links a.nav-cta:hover { filter: brightness(1.06); transform: translateY(-1px); color: #fff; }
@media (max-width: 640px) {
  .nav { flex-wrap: wrap; }
  .nav .links { width: 100%; margin-left: 0; justify-content: center; }
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 700;
  padding: 12px 26px;
  transition: all .18s;
  text-decoration: none;
}
.btn-primary {
  background: var(--grad-primary);
  color: #fff;
  box-shadow: 0 8px 22px rgba(108, 116, 245, .40);
}
.btn-primary:hover { filter: brightness(1.07); transform: translateY(-2px); box-shadow: 0 12px 28px rgba(108, 116, 245, .48); }
.btn-dark {
  background: var(--ink);
  color: #fff;
  box-shadow: 0 8px 20px rgba(33, 37, 45, .26);
}
.btn-dark:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(33, 37, 45, .34); }
.btn-ghost {
  background: var(--surface);
  color: var(--ink);
  border: 2px solid rgba(33, 37, 45, .10);
  box-shadow: none;
}
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-2px); }
.btn-sm { padding: 8px 18px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none !important; }

/* ===== 卡片 ===== */
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(124, 92, 252, .06);
  transition: transform .22s, box-shadow .22s;
}
.card.hoverable:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-pop);
}

/* ===== 彩色图标块（渐变） ===== */
.chip-icon {
  width: 52px; height: 52px;
  border-radius: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex: 0 0 auto;
  color: #fff;
}
.chip-purple { background: linear-gradient(135deg, #9b7bfc, #c9b8ff); }
.chip-orange { background: linear-gradient(135deg, #ffa94d, #ffd43b); }
.chip-lime   { background: linear-gradient(135deg, #51cf66, #a9e34b); }
.chip-mint   { background: linear-gradient(135deg, #38d9a9, #8fd9b5); }
.chip-coral  { background: linear-gradient(135deg, #ff8787, #f783ac); }
.chip-sky    { background: linear-gradient(135deg, #4dabf7, #74c0fc); }
.chip-soft   { background: var(--primary-soft); color: var(--primary); }

/* ===== 标签 pill ===== */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 999px;
  padding: 7px 16px;
  font-size: 13px;
  font-weight: 700;
}
.pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-green); }
.pill.pink { background: #ffe9ee; color: #e64980; }

/* ===== 区块容器 ===== */
.section { max-width: 1120px; margin: 0 auto; padding: 0 clamp(16px, 4vw, 40px); }
.sec-head { margin-bottom: var(--gap-lg); text-align: center; }
.sec-head .kicker {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: #ffe9ee;
  color: #e64980;
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 13px;
  font-weight: 800;
  margin-bottom: 14px;
}
.sec-head h2 { font-size: clamp(24px, 3.4vw, 34px); font-weight: 900; line-height: 1.25; }
.sec-head h2 .u {
  background: linear-gradient(transparent 62%, var(--accent-yellow) 62%, var(--accent-yellow) 92%, transparent 92%);
  padding: 0 2px;
}
.sec-head p { color: var(--ink-2); margin-top: 10px; font-size: 15px; }

/* ===== 输入框 ===== */
.input {
  width: 100%;
  border: 2px solid rgba(33, 37, 45, .08);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 14px;
  font-family: var(--font);
  color: var(--ink);
  background: var(--bg-soft);
  transition: border-color .15s, box-shadow .15s;
}
.input:focus {
  outline: none;
  border-color: var(--primary);
  background: #fff;
  box-shadow: 0 0 0 4px rgba(124, 92, 252, .14);
}

/* ===== 提示条 ===== */
.notice {
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 13px;
  line-height: 1.5;
  display: none;
}
.notice.show { display: block; }
.notice-warn { background: #fff4e0; color: #9a6700; border: 1px solid #ffd9a0; }
.notice-err  { background: #fdecea; color: #b3261e; border: 1px solid #f6b6b0; }
.notice-ok   { background: #e9faee; color: #1c7a58; border: 1px solid #b3e3cd; }

/* ===== 页脚 ===== */
.footer {
  margin-top: var(--gap-xl);
  padding: var(--gap-lg) clamp(16px, 4vw, 48px);
  text-align: center;
  color: var(--ink-3);
  font-size: 13px;
}