:root {
  /* Palette mirrored from web/sheet-workbench/src/v2/app.css (v2 冷灰靛蓝). */
  --background: #f5f6f8;
  --foreground: #13171e;
  --card: #ffffff;
  --primary: #4338ca;
  --primary-hover: #3730a3;
  --primary-foreground: #ffffff;
  --muted-foreground: #5a6472;
  --accent: #eceeff;
  --border: #e2e5ea;
  --input: #d0d5dd;
  --ring: #4338ca;
  --up: #c8302a;

  color: var(--foreground);
  background: var(--background);
  font-family: -apple-system, "SF Pro Text", "PingFang SC", "Noto Sans SC", "Microsoft YaHei UI", system-ui, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }

body { margin: 0; min-width: 320px; }

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px;
  background: var(--background);
}

.login-card {
  width: min(460px, 100%);
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  box-shadow: 0 1px 2px color-mix(in srgb,var(--foreground) 6%,transparent), 0 8px 24px color-mix(in srgb,var(--foreground) 10%,transparent);
}

.login-card header {
  display: flex;
  gap: 16px;
  align-items: center;
  padding: 28px 30px 8px;
  color: var(--foreground);
  background: var(--card);
}

.brand-mark {
  display: grid;
  flex: 0 0 48px;
  height: 48px;
  place-items: center;
  border-radius: 12px;
  color: var(--primary-foreground);
  background: var(--primary);
  font-size: 24px;
  font-weight: 800;
}

.login-card header p { margin: 0 0 5px; color: var(--muted-foreground); font-size: 13px; }
.login-card h1 { margin: 0; font-size: 23px; line-height: 1.35; }

form { display: grid; gap: 9px; padding: 30px; }
label { margin-top: 7px; font-size: 13px; font-weight: 600; }

input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--input);
  border-radius: 8px;
  color: var(--foreground);
  background: var(--card);
  font: inherit;
}

input:focus { outline: 3px solid color-mix(in srgb,var(--ring) 20%,transparent); border-color: var(--ring); }

button {
  min-height: 44px;
  margin-top: 10px;
  border: 0;
  border-radius: 8px;
  color: var(--primary-foreground);
  background: var(--primary);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

button:hover { background: var(--primary-hover); }
button:disabled { cursor: wait; opacity: 0.65; }

.login-message { min-height: 20px; margin: 4px 0 0; color: var(--up); font-size: 13px; }
.login-card footer { padding: 0 30px 25px; color: var(--muted-foreground); font-size: 12px; text-align: center; }