/* ===== 破译 · 基础主题（活泼彩色） ===== */
:root {
  --bg: #fef6ff;
  --bg-grad-1: #ffe5ec;
  --bg-grad-2: #e0f7ff;
  --bg-grad-3: #fff7d6;
  --surface: #ffffff;
  --surface-2: #fff3fb;
  --text: #2b2440;
  --muted: #8a83a3;
  --line: #f0d8ee;

  --coral: #ff6b8a;
  --mint: #2fd6a8;
  --sun: #ffc83d;
  --grape: #9b6bff;
  --sky: #4cc9f0;
  --ink: #3a3458;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 10px 30px rgba(155, 107, 255, 0.14);
  --shadow-sm: 0 4px 14px rgba(155, 107, 255, 0.12);
  --tap: 46px;
  --topbar-bg: rgba(255, 255, 255, 0.82);
  --toast-bg: #2b2440;
  --toast-fg: #ffffff;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 500px at 12% -8%, var(--bg-grad-1), transparent 60%),
    radial-gradient(900px 520px at 96% 4%, var(--bg-grad-2), transparent 58%),
    radial-gradient(800px 600px at 50% 110%, var(--bg-grad-3), transparent 60%),
    var(--bg);
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-tap-highlight-color: transparent;
  line-height: 1.5;
}

img { max-width: 100%; }

a { color: var(--grape); text-decoration: none; }

.wrap { width: min(960px, 100%); margin: 0 auto; padding: 18px 16px 48px; }

/* 流式标题 */
h1, h2, h3 { margin: 0 0 .4em; line-height: 1.2; font-weight: 800; }
.site-title {
  font-size: clamp(26px, 6vw, 42px);
  background: linear-gradient(90deg, var(--coral), var(--grape), var(--sky));
  -webkit-background-clip: text; background-clip: text; color: transparent;
  letter-spacing: .5px;
}
.lede { color: var(--muted); font-size: clamp(14px, 3.4vw, 17px); margin: 0 0 22px; }

/* 通用可点击目标 */
button { font-family: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--grape); outline-offset: 2px; }

/* 隐藏但可访问 */
.visually-hidden {
  position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0);
}

/* ===== 深色模式（全站，含游戏内顶栏 / 卡片 / 弹窗） ===== */
:root { color-scheme: light; }
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14101f;
  --bg-grad-1: #1b1430;
  --bg-grad-2: #171028;
  --bg-grad-3: #1a1330;
  --surface: #211a33;
  --surface-2: #2c2440;
  --text: #ece8f7;
  --muted: #a79fc4;
  --line: #3a3155;
  --ink: #ece8f7;            /* 浅色化：作为文字可读；少数棋盘用它作底框会反相为浅框，仍清晰 */
  --coral: #ff8aa3;
  --mint: #4be3b8;
  --sun: #ffd76a;
  --grape: #b18bff;
  --sky: #6bd6f5;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.4);
  --topbar-bg: rgba(33, 26, 51, 0.86);
  --toast-bg: #0e0b16;
  --toast-fg: #ffffff;
}

@media (prefers-reduced-motion: no-preference) {
  body, .topbar, .modal, .btn, .chip, .tab, .appicon, .card, .icon-btn {
    transition: background-color .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
  }
}