/* ===== 共用浅色主题 ===== */
:root {
  --bg: #f5f6fb;
  --bg-grad: radial-gradient(1200px 600px at 50% -10%, #eef1ff 0%, #f5f6fb 55%);
  --card: #ffffff;
  --ink: #1c2333;
  --ink-soft: #5b6478;
  --ink-faint: #9aa2b4;
  --line: #e7e9f2;
  --primary: #4f6bff;
  --primary-d: #3a56f0;
  --primary-soft: #eef1ff;
  --green: #12b76a;
  --green-soft: #e7f8ef;
  --amber: #f59e0b;
  --red: #ef4444;
  --red-soft: #fdecec;
  --shadow: 0 10px 30px rgba(30, 41, 89, .08);
  --shadow-sm: 0 2px 8px rgba(30, 41, 89, .06);
  --radius: 16px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg-grad), var(--bg);
  background-attachment: fixed;
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 40px 20px 80px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; margin-bottom: 6px; }
.brand .dot { width: 26px; height: 26px; border-radius: 8px; background: linear-gradient(135deg, #4f6bff, #7c3aed); display: inline-flex; align-items: center; justify-content: center; color: #fff; font-size: 15px; }
h1 { font-size: 24px; font-weight: 700; letter-spacing: -.3px; }
.sub { color: var(--ink-soft); font-size: 14px; margin-bottom: 26px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; margin-bottom: 18px; box-shadow: var(--shadow); }
button { font-family: inherit; cursor: pointer; border: none; border-radius: 12px; font-size: 15px; font-weight: 600; padding: 13px 22px; transition: .16s; }
.primary { background: var(--primary); color: #fff; box-shadow: 0 6px 16px rgba(79, 107, 255, .28); }
.primary:hover { background: var(--primary-d); transform: translateY(-1px); }
.primary:disabled { background: #c7cde0; color: #fff; cursor: not-allowed; box-shadow: none; transform: none; }
.ghost { background: #eef0f7; color: #47506a; }
.ghost:hover { background: #e4e7f2; }
.ghost:disabled { color: #aeb5c7; cursor: default; }
input[type=text], input[type=password] {
  width: 100%; background: #fbfcff; border: 1.5px solid var(--line); border-radius: 12px;
  padding: 13px 15px; color: var(--ink); font-size: 15px; font-family: inherit; transition: .15s;
}
input[type=text]:focus, input[type=password]:focus { outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 4px var(--primary-soft); }
.tip { color: var(--ink-faint); font-size: 13px; margin-top: 10px; }
.label { color: var(--ink-soft); font-size: 13px; font-weight: 600; margin: 18px 0 8px; }