/* Alpha Intellect 全局主题
 * data-theme: cloud | aurora | midnight
 * 字体：简体无衬线（Noto Sans SC + Nunito）
 */
:root {
  /* Noto Sans SC 保证简体汉字（如「产」）字重一致；Nunito 补拉丁园体感 */
  --font-sans: "Noto Sans SC", "Nunito", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 18px 50px rgba(28, 52, 78, 0.08);
  --theme-transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease,
    box-shadow 0.25s ease;
}

/* 云白：接近 App 截图的清爽白蓝 */
html[data-theme="cloud"],
:root {
  --bg: #f3f5f8;
  --bg-2: #eef2f7;
  --paper: #ffffff;
  --ink: #111827;
  --muted: #667085;
  --line: rgba(17, 24, 39, 0.1);
  --accent: #2f6bff;
  --accent-2: #1d4ed8;
  --accent-soft: rgba(47, 107, 255, 0.1);
  --card: #ffffff;
  --card-border: rgba(17, 24, 39, 0.08);
  --footer: #98a2b3;
  --em: #2f6bff;
  --arrow-ink: #ffffff;
  --danger: #c2410c;
  --ok: #0f8f6c;
  --glow: rgba(47, 107, 255, 0.16);
  --surface-grad: linear-gradient(165deg, #f7f9fc 0%, #eef2f7 100%);
  --ring: color-mix(in srgb, var(--accent) 14%, transparent);
  --feature-bg: #111827;
  --feature-ink: #fffdf8;
  --feature-muted: #bdc5d3;
  --feature-eyebrow: #ff9a7d;
  --feature-action-border: rgba(255, 255, 255, 0.35);
  --feature-action-hover-bg: #fffdf8;
  --feature-action-hover-ink: #111827;
  --nav-glass: color-mix(in srgb, var(--bg) 92%, transparent);
  --tag-bg: #ebe8df;
  --tag-ink: #5e687a;
  --blue: #315bba;
  --blue-soft: #e8eefb;
  --warn: #8a5b16;
  --green: #14785c;

  /* daily 兼容别名 */
  --site-bg: var(--bg);
  --site-paper: var(--paper);
  --site-ink: var(--ink);
  --site-muted: var(--muted);
  --site-line: var(--line);
  --site-accent: var(--accent);
  --site-accent-soft: var(--accent-soft);
  --site-green: var(--ok);
  --site-shadow: var(--shadow);
}

/* 青雾：青绿浅色 */
html[data-theme="aurora"] {
  --bg: #f3faf7;
  --bg-2: #e8f5f0;
  --paper: #ffffff;
  --ink: #123028;
  --muted: rgba(18, 48, 40, 0.62);
  --line: rgba(15, 143, 108, 0.16);
  --accent: #0f8f6c;
  --accent-2: #0b6f55;
  --accent-soft: rgba(15, 143, 108, 0.12);
  --card: rgba(255, 255, 255, 0.88);
  --card-border: rgba(15, 143, 108, 0.22);
  --footer: rgba(18, 48, 40, 0.45);
  --em: #0f8f6c;
  --arrow-ink: #f7fffb;
  --danger: #b45309;
  --ok: #0f8f6c;
  --glow: rgba(15, 143, 108, 0.18);
  --surface-grad:
    radial-gradient(900px 520px at 8% -10%, rgba(56, 180, 160, 0.14), transparent 55%),
    radial-gradient(760px 480px at 96% 4%, rgba(15, 143, 108, 0.1), transparent 48%),
    linear-gradient(165deg, #f5fbf8 0%, #e8f5f0 100%);
  --ring: color-mix(in srgb, var(--accent) 16%, transparent);
  --feature-bg: #123028;
  --feature-ink: #f7fffb;
  --feature-muted: rgba(247, 255, 251, 0.72);
  --feature-eyebrow: #6ee7b7;
  --feature-action-border: rgba(247, 255, 251, 0.35);
  --feature-action-hover-bg: #f7fffb;
  --feature-action-hover-ink: #123028;
  --nav-glass: color-mix(in srgb, var(--bg) 92%, transparent);
  --tag-bg: #e2f1ec;
  --tag-ink: #2a5c4c;
  --blue: #1f6f9a;
  --blue-soft: #e4f1f7;
  --warn: #8a5b16;
  --green: #0f8f6c;

  --site-bg: var(--bg);
  --site-paper: var(--paper);
  --site-ink: var(--ink);
  --site-muted: var(--muted);
  --site-line: var(--line);
  --site-accent: var(--accent);
  --site-accent-soft: var(--accent-soft);
  --site-green: var(--ok);
  --site-shadow: var(--shadow);
}

/* 墨夜 */
html[data-theme="midnight"] {
  --bg: #071018;
  --bg-2: #0d1b28;
  --paper: #102033;
  --ink: #e8f0f4;
  --muted: rgba(214, 228, 236, 0.68);
  --line: rgba(120, 170, 190, 0.18);
  --accent: #3ddea8;
  --accent-2: #7dd3fc;
  --accent-soft: rgba(61, 222, 168, 0.14);
  --card: rgba(12, 24, 36, 0.86);
  --card-border: rgba(61, 222, 168, 0.28);
  --footer: rgba(214, 228, 236, 0.42);
  --em: #3ddea8;
  --arrow-ink: #071018;
  --danger: #fb923c;
  --ok: #3ddea8;
  --glow: rgba(56, 180, 220, 0.2);
  --surface-grad:
    radial-gradient(1100px 700px at 12% -10%, rgba(56, 180, 220, 0.16), transparent 55%),
    radial-gradient(900px 600px at 88% 10%, rgba(61, 222, 168, 0.1), transparent 50%),
    linear-gradient(165deg, #071018 0%, #0d1b28 48%, #091622 100%);
  --ring: color-mix(in srgb, var(--accent) 22%, transparent);
  /* 勿回退到 --site-ink（墨夜下 --ink 是浅色） */
  --feature-bg: #0b2f2a;
  --feature-ink: #e8f7f2;
  --feature-muted: rgba(214, 236, 228, 0.82);
  --feature-eyebrow: #3ddea8;
  --feature-action-border: rgba(61, 222, 168, 0.45);
  --feature-action-hover-bg: #3ddea8;
  --feature-action-hover-ink: #071018;
  --nav-glass: color-mix(in srgb, var(--bg) 88%, transparent);
  --tag-bg: rgba(61, 222, 168, 0.12);
  --tag-ink: #b7f0d8;
  --blue: #7dd3fc;
  --blue-soft: rgba(125, 211, 252, 0.14);
  --warn: #fb923c;
  --green: #3ddea8;

  --site-bg: var(--bg);
  --site-paper: var(--paper);
  --site-ink: var(--ink);
  --site-muted: var(--muted);
  --site-line: var(--line);
  --site-accent: var(--accent);
  --site-accent-soft: var(--accent-soft);
  --site-green: var(--ok);
  --site-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
}

html {
  color-scheme: light;
}

html[data-theme="midnight"] {
  color-scheme: dark;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--surface-grad);
  transition: var(--theme-transition);
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

/* 主题切换控件 */
.theme-switcher {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
  white-space: nowrap;
}

.theme-switcher button {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 7px 11px;
  border-radius: 9px;
  cursor: pointer;
  min-height: 34px;
  line-height: 1;
  transition: var(--theme-transition);
}

.theme-switcher button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--arrow-ink);
}

.theme-switcher button:hover,
.theme-switcher button:focus-visible {
  color: var(--ink);
  outline: none;
}

.theme-switcher button[aria-pressed="true"]:hover {
  color: var(--arrow-ink);
}

@media (max-width: 640px) {
  .theme-switcher button {
    padding: 7px 9px;
    font-size: 11px;
  }
}