/* 客户端可切换主题。
   默认（无 data-theme 或 data-theme="space"）= 原「深空」主题，完全沿用 dark.css / home.css，本文件不动它。
   其余主题通过覆盖 dark.css / home.css 的 CSS 变量 + 重绘 .space-bg 背景实现；
   星空 canvas 的颜色由 --fx-* 变量驱动（见 space.js），--fx-stars:0 则关闭 canvas（亮色主题用）。

   主题切换器（右下角浮窗）的配色走 --switch-* 变量，逐主题自适应。 */

:root {
  --switch-bg: rgba(18, 20, 26, 0.72);
  --switch-fg: #eef1f6;
  --switch-border: rgba(255, 255, 255, 0.16);
  --switch-pop: rgba(16, 18, 24, 0.96);
  --switch-hover: rgba(255, 255, 255, 0.08);
}

/* ============================================================
   极光 Aurora —— 深夜墨绿 + 青绿/紫极光，星点偏青
   ============================================================ */
html[data-theme="aurora"] {
  --bg: #04100e; --bg-2: #07140f;
  --ink: #ecfff8; --ink-soft: #c2ddd2; --text: #bcd2c9; --muted: #84a195; --faint: #56756a;
  --border: rgba(180, 255, 230, 0.12); --border-strong: rgba(180, 255, 230, 0.22);
  --surface: rgba(180, 255, 230, 0.05); --surface-2: rgba(180, 255, 230, 0.09);
  --accent: #28e0b0; --accent-hover: #46f0c4; --accent-soft: rgba(40, 224, 176, 0.16);
  --grad: linear-gradient(115deg, #2bf5c8 0%, #4be07b 50%, #7b9bff 100%);

  --h-bg: #04100e; --h-bg2: #07140f; --h-ink: #ecfff8; --h-text: #bcd2c9;
  --h-muted: #84a195; --h-faint: #56756a;
  --h-line: rgba(180, 255, 230, 0.12); --h-line-soft: rgba(180, 255, 230, 0.07);
  --h-panel: rgba(180, 255, 230, 0.04);
  --h-cyan: #2bf5c8; --h-blue: #36d97b; --h-violet: #7b9bff;
  --h-grad: linear-gradient(115deg, #2bf5c8 0%, #4be07b 50%, #7b9bff 100%);

  --fx-stars: 1; --fx-star: 210, 255, 240; --fx-star2: 120, 245, 210;
  --fx-meteor: 150, 255, 225; --fx-meteor2: 90, 210, 180; --fx-dot: 210, 255, 240;
}
html[data-theme="aurora"] .space-bg {
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(43, 245, 200, 0.20), transparent 60%),
    radial-gradient(100% 70% at 82% 112%, rgba(123, 155, 255, 0.22), transparent 60%),
    linear-gradient(180deg, #04120f 0%, #06090f 100%);
}
html[data-theme="aurora"] .space-bg::before {
  background: linear-gradient(90deg, rgba(2, 8, 6, 0.55) 0%, rgba(2, 8, 6, 0.18) 55%, rgba(2, 8, 6, 0.40) 100%);
}
html[data-theme="aurora"] .card,
html[data-theme="aurora"] .redeem-panel { background: #08160f; }

/* ============================================================
   落日 Sunset —— 暮色深紫 + 暖橙/品红，星点偏暖
   ============================================================ */
html[data-theme="sunset"] {
  --bg: #120814; --bg-2: #0c0610;
  --ink: #fff2f5; --ink-soft: #e6cdd6; --text: #d8c3cd; --muted: #a78a98; --faint: #6f5667;
  --border: rgba(255, 200, 220, 0.12); --border-strong: rgba(255, 200, 220, 0.22);
  --surface: rgba(255, 200, 220, 0.05); --surface-2: rgba(255, 200, 220, 0.09);
  --accent: #ff5c8a; --accent-hover: #ff7aa0; --accent-soft: rgba(255, 92, 138, 0.16);
  --grad: linear-gradient(115deg, #ff9a5b 0%, #ff5c8a 52%, #b15cff 100%);

  --h-bg: #120814; --h-bg2: #0c0610; --h-ink: #fff2f5; --h-text: #d8c3cd;
  --h-muted: #a78a98; --h-faint: #6f5667;
  --h-line: rgba(255, 200, 220, 0.12); --h-line-soft: rgba(255, 200, 220, 0.07);
  --h-panel: rgba(255, 200, 220, 0.04);
  --h-cyan: #ff9a5b; --h-blue: #ff5c8a; --h-violet: #b15cff;
  --h-grad: linear-gradient(115deg, #ff9a5b 0%, #ff5c8a 52%, #b15cff 100%);

  --fx-stars: 1; --fx-star: 255, 235, 225; --fx-star2: 255, 160, 190;
  --fx-meteor: 255, 200, 170; --fx-meteor2: 255, 120, 160; --fx-dot: 255, 225, 210;
}
html[data-theme="sunset"] .space-bg {
  background:
    radial-gradient(120% 80% at 50% 115%, rgba(255, 138, 91, 0.24), transparent 60%),
    radial-gradient(95% 70% at 80% -12%, rgba(177, 92, 255, 0.22), transparent 55%),
    linear-gradient(180deg, #14081a 0%, #0a0610 100%);
}
html[data-theme="sunset"] .space-bg::before {
  background: linear-gradient(90deg, rgba(8, 4, 10, 0.55) 0%, rgba(8, 4, 10, 0.18) 55%, rgba(8, 4, 10, 0.40) 100%);
}
html[data-theme="sunset"] .card,
html[data-theme="sunset"] .redeem-panel { background: #170a16; }

/* ============================================================
   墨 Noir —— 极简单色，近黑底 + 银白点缀，星点冷白
   ============================================================ */
html[data-theme="noir"] {
  --bg: #0a0a0b; --bg-2: #0f0f11;
  --ink: #f4f6f9; --ink-soft: #c8ccd3; --text: #bcc0c8; --muted: #868b94; --faint: #565a63;
  --border: rgba(255, 255, 255, 0.11); --border-strong: rgba(255, 255, 255, 0.20);
  --surface: rgba(255, 255, 255, 0.04); --surface-2: rgba(255, 255, 255, 0.08);
  --accent: #c9d1dc; --accent-hover: #ffffff; --accent-soft: rgba(255, 255, 255, 0.12);
  --grad: linear-gradient(115deg, #ffffff 0%, #b9c0cc 50%, #6b7280 100%);

  --h-bg: #0a0a0b; --h-bg2: #0f0f11; --h-ink: #f4f6f9; --h-text: #bcc0c8;
  --h-muted: #868b94; --h-faint: #565a63;
  --h-line: rgba(255, 255, 255, 0.11); --h-line-soft: rgba(255, 255, 255, 0.06);
  --h-panel: rgba(255, 255, 255, 0.035);
  --h-cyan: #ffffff; --h-blue: #b9c0cc; --h-violet: #6b7280;
  --h-grad: linear-gradient(115deg, #ffffff 0%, #b9c0cc 50%, #6b7280 100%);

  --fx-stars: 1; --fx-star: 235, 238, 242; --fx-star2: 180, 186, 196;
  --fx-meteor: 230, 233, 238; --fx-meteor2: 150, 156, 166; --fx-dot: 245, 247, 250;
}
html[data-theme="noir"] .space-bg {
  background:
    radial-gradient(120% 80% at 50% -10%, rgba(255, 255, 255, 0.06), transparent 58%),
    linear-gradient(180deg, #0b0b0c 0%, #070708 100%);
}
html[data-theme="noir"] .space-bg::before {
  background: linear-gradient(90deg, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.20) 55%, rgba(0, 0, 0, 0.40) 100%);
}
html[data-theme="noir"] .card,
html[data-theme="noir"] .redeem-panel { background: #121214; }

/* ============================================================
   白昼 Daylight —— 亮色：白卡 + 海军蓝墨字 + 蓝色强调（关闭星空 canvas）
   ============================================================ */
html[data-theme="daylight"] {
  --bg: #f6f8fc; --bg-2: #eef2f8;
  --ink: #0e1730; --ink-soft: #26324a; --text: #33415c; --muted: #5e6b82; --faint: #93a0b4;
  --border: rgba(14, 23, 48, 0.12); --border-strong: rgba(14, 23, 48, 0.22);
  --surface: rgba(14, 23, 48, 0.03); --surface-2: rgba(14, 23, 48, 0.06);
  --accent: #2f6bff; --accent-hover: #1f5bef; --accent-soft: rgba(47, 107, 255, 0.12);
  --grad: linear-gradient(115deg, #2f6bff 0%, #5b8cff 50%, #7b5bff 100%);
  --shadow: 0 30px 70px -28px rgba(40, 60, 110, 0.28);

  --h-bg: #f6f8fc; --h-bg2: #eef2f8; --h-ink: #0e1730; --h-text: #33415c;
  --h-muted: #5e6b82; --h-faint: #93a0b4;
  --h-line: rgba(14, 23, 48, 0.12); --h-line-soft: rgba(14, 23, 48, 0.07);
  --h-panel: rgba(14, 23, 48, 0.03);
  --h-cyan: #2f6bff; --h-blue: #2f6bff; --h-violet: #7b5bff;
  --h-grad: linear-gradient(115deg, #2f6bff 0%, #5b8cff 50%, #7b5bff 100%);

  --fx-stars: 0;

  --switch-bg: rgba(255, 255, 255, 0.85); --switch-fg: #0e1730;
  --switch-border: rgba(14, 23, 48, 0.16); --switch-pop: #ffffff;
  --switch-hover: rgba(14, 23, 48, 0.06);
}
html[data-theme="daylight"] .space-bg {
  background:
    radial-gradient(110% 80% at 50% -10%, #e8f0ff 0%, transparent 60%),
    radial-gradient(90% 70% at 85% 110%, #ede7ff 0%, transparent 60%),
    linear-gradient(180deg, #f7f9fc 0%, #eef2f8 100%);
}
html[data-theme="daylight"] .space-bg::before { background: none; }

html[data-theme="daylight"] a { color: #2f6bff; }
html[data-theme="daylight"] .topbar { background: rgba(255, 255, 255, 0.85); border-bottom-color: var(--border); }
html[data-theme="daylight"] .topbar nav a,
html[data-theme="daylight"] .home-nav a { color: #33415c; }
html[data-theme="daylight"] .topbar nav a:hover,
html[data-theme="daylight"] .topbar nav a.active,
html[data-theme="daylight"] .home-nav a:hover { color: var(--ink); }

html[data-theme="daylight"] .card,
html[data-theme="daylight"] .redeem-panel {
  background: #ffffff; border-color: var(--border);
  box-shadow: 0 24px 60px -32px rgba(40, 60, 110, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.6);
}

html[data-theme="daylight"] input:not([type="checkbox"]):not([type="radio"]),
html[data-theme="daylight"] select,
html[data-theme="daylight"] textarea,
html[data-theme="daylight"] .h-input {
  background: #ffffff; border-color: var(--border); color: var(--ink);
}
html[data-theme="daylight"] input:not([type="checkbox"]):not([type="radio"]):focus,
html[data-theme="daylight"] select:focus,
html[data-theme="daylight"] textarea:focus,
html[data-theme="daylight"] .h-input:focus {
  border-color: var(--accent); background: #ffffff; box-shadow: 0 0 0 4px rgba(47, 107, 255, 0.14);
}
html[data-theme="daylight"] input::placeholder,
html[data-theme="daylight"] textarea::placeholder,
html[data-theme="daylight"] .h-input::placeholder { color: var(--faint); }

html[data-theme="daylight"] .btn-primary,
html[data-theme="daylight"] .h-btn {
  background: #10254e; color: #fff; border-color: rgba(16, 37, 78, 0.3);
  box-shadow: 0 18px 40px -18px rgba(16, 37, 78, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}
html[data-theme="daylight"] .btn-primary:hover,
html[data-theme="daylight"] .h-btn:hover { background: #173468; border-color: rgba(16, 37, 78, 0.45); }

html[data-theme="daylight"] code { background: rgba(14, 23, 48, 0.06); color: var(--ink-soft); }
html[data-theme="daylight"] strong { color: var(--ink); }
html[data-theme="daylight"] .table-wrap { background: #ffffff; }
html[data-theme="daylight"] th { background: rgba(14, 23, 48, 0.03); }
html[data-theme="daylight"] tbody tr:hover { background: rgba(14, 23, 48, 0.03); }
html[data-theme="daylight"] .badge-product { background: rgba(14, 23, 48, 0.06); color: var(--ink-soft); }
html[data-theme="daylight"] .seg-toggle { background: rgba(14, 23, 48, 0.05); }
html[data-theme="daylight"] .seg-toggle .seg-btn:has(input:checked) { background: #10254e; color: #fff; }
html[data-theme="daylight"] .step.active .num { background: #10254e; color: #fff; }
html[data-theme="daylight"] .step.done .num { background: rgba(14, 23, 48, 0.12); color: var(--ink); border-color: var(--border); }

/* 亮色下提示条文字加深以保证对比度 */
html[data-theme="daylight"] .alert-error,
html[data-theme="daylight"] .h-alert { color: #b42318; }
html[data-theme="daylight"] .alert-success { color: #067647; }
html[data-theme="daylight"] .alert-info { color: #1f5bef; }
html[data-theme="daylight"] .alert-warn { color: #92500f; }

/* ============================================================
   主题切换器（右下角浮窗）—— 配色走 --switch-* 自适应
   ============================================================ */
.theme-switch { position: fixed; right: 18px; bottom: 18px; z-index: 60; }

.theme-trigger {
  width: 44px; height: 44px; display: grid; place-items: center;
  border-radius: 999px; cursor: pointer;
  color: var(--switch-fg); background: var(--switch-bg);
  border: 1px solid var(--switch-border);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  box-shadow: 0 12px 30px -12px rgba(0, 0, 0, 0.5);
  transition: transform .18s cubic-bezier(.2, .8, .2, 1), box-shadow .2s, background .2s;
}
.theme-trigger:hover { transform: translateY(-2px); box-shadow: 0 18px 40px -14px rgba(0, 0, 0, 0.55); }
.theme-trigger:active { transform: translateY(0) scale(.96); }
.theme-trigger svg { width: 20px; height: 20px; }

.theme-menu {
  position: absolute; right: 0; bottom: 56px; width: 188px; padding: 8px;
  border-radius: 16px; background: var(--switch-pop); border: 1px solid var(--switch-border);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  box-shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.55);
  transform-origin: bottom right;
  animation: theme-pop .16s cubic-bezier(.2, .8, .2, 1) both;
}
.theme-menu[hidden] { display: none; }
@keyframes theme-pop { from { opacity: 0; transform: translateY(6px) scale(.96); } to { opacity: 1; transform: none; } }

.theme-menu-title {
  font-size: .68rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--switch-fg); opacity: .55; padding: 6px 10px 8px;
}
.theme-item {
  width: 100%; display: flex; align-items: center; gap: 11px;
  padding: 9px 10px; margin: 0; border: 0; border-radius: 10px; cursor: pointer;
  background: transparent; color: var(--switch-fg); font: inherit; font-size: .92rem; text-align: left;
  transition: background .14s;
}
.theme-item:hover { background: var(--switch-hover); }
.theme-item .sw {
  width: 20px; height: 20px; border-radius: 999px; flex: none;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}
.theme-item .nm { flex: 1; }
.theme-item .ck { width: 16px; height: 16px; opacity: 0; flex: none; }
.theme-item[aria-checked="true"] .ck { opacity: 1; }
.theme-item[aria-checked="true"] { font-weight: 600; }

@media (max-width: 560px) {
  .theme-switch { right: 14px; bottom: 14px; }
}
@media (prefers-reduced-motion: reduce) {
  .theme-menu { animation: none; }
  .theme-trigger { transition: none; }
}