:root, html[data-theme="dark"] {
  --bg0: #0f1419;
  --bg1: #182029;
  --ink: #e8eef4;
  --muted: #8b9aab;
  --line: #2a3644;
  --accent: #3d9cf0;
  --accent2: #2a7ec4;
  --card: #151c24;
  --ok: #6bcb8a;
  --btn-fill: #1c2631;
  --guide-glow: rgba(61, 156, 240, 0.18);
  --hero-glow2: rgba(107, 203, 138, 0.08);
  color-scheme: dark;
}

html[data-theme="light"] {
  --bg0: #f4f7fb;
  --bg1: #e8eef6;
  --ink: #142033;
  --muted: #5b6b7c;
  --line: #d5dee8;
  --accent: #1f7fd6;
  --accent2: #1766ad;
  --card: #ffffff;
  --ok: #1f8a4c;
  --btn-fill: #ffffff;
  --guide-glow: rgba(31, 127, 214, 0.12);
  --hero-glow2: rgba(31, 138, 76, 0.08);
  color-scheme: light;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font: 16px/1.55 "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(900px 420px at 12% -10%, var(--guide-glow), transparent 55%),
    radial-gradient(700px 380px at 100% 0%, var(--hero-glow2), transparent 50%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 20px 64px;
}

.hero { margin-bottom: 22px; }
.hero-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.brand {
  margin: 0;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
  text-decoration: none;
}
.brand-logo {
  display: block;
  border-radius: 8px;
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--line) 70%, transparent);
  background: #0b1f3a;
}
.theme-toggle {
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--btn-fill);
  color: var(--ink);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
}
.theme-toggle:hover { border-color: var(--accent); }

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 650;
  letter-spacing: -0.02em;
}
.lede { margin: 0 0 8px; color: var(--ink); max-width: 38em; }
.muted { color: var(--muted); }
.muted a, footer a { color: var(--accent); }
.small { font-size: 13px; }
.hero a { color: var(--accent); }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 16px;
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: color-mix(in srgb, var(--card) 88%, transparent);
}
.tab {
  flex: 1 1 120px;
  min-height: 42px;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: var(--muted);
  font-size: 15px;
  font-weight: 650;
  cursor: pointer;
}
.tab[aria-selected="true"] {
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  color: #ffffff;
}
.tab:hover:not([aria-selected="true"]) { color: var(--ink); background: color-mix(in srgb, var(--btn-fill) 80%, transparent); }

.panel { display: grid; gap: 14px; min-height: 120px; }

.app {
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--card) 92%, transparent);
  backdrop-filter: blur(8px);
  border-radius: 14px;
  padding: 18px 18px 16px;
}

.app-top {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  align-items: baseline;
  margin-bottom: 6px;
}
.platform {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ok);
}
.app h2 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
}
.subtitle { margin: 0 0 8px; color: var(--muted); font-size: 14px; }
.hint {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.45;
}

.mirrors {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--btn-fill);
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
  font-weight: 550;
  transition: border-color .15s, background .15s, transform .12s;
}
.btn:hover { border-color: var(--accent); }
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(180deg, var(--accent), var(--accent2));
  border-color: transparent;
  color: #ffffff;
}
.btn.primary:hover { filter: brightness(1.05); }

.empty {
  border: 1px dashed var(--line);
  border-radius: 14px;
  padding: 28px 18px;
  color: var(--muted);
  text-align: center;
}

.err {
  margin-top: 16px;
  padding: 12px 14px;
  border-radius: 10px;
  background: color-mix(in srgb, #3a1f24 80%, var(--card));
  color: #ffb4b8;
}

footer { margin-top: 28px; }