:root {
  /* Palette mirrored from web/sheet-workbench/src/framework.css. */
  --background: #F6F4EF;
  --foreground: #1C1B19;
  --card: #FFFFFF;
  --popover: #FFFFFF;
  --primary: #1C1B19;
  --primary-foreground: #FFFFFF;
  --secondary: #EFECE5;
  --muted: #EFECE5;
  --muted-foreground: #6E6A62;
  --accent: #F7EEDC;
  --accent-foreground: #8F5B12;
  --border: #E6E2D9;
  --input: #E6E2D9;
  --ring: #B7791F;
  --sidebar: #F6F4EF;
  --brand: #B7791F;
  --brand-text: #8F5B12;
  --brand-on-dark: #E0A43E;
  --track: #ECE8DF;
  --up: #BC3A33;
  --down: #2A7D4F;
  --flat: #6E6A62;
  --up-on-dark: #FF9E8F;
  --down-on-dark: #8FD6A8;
  --muted-on-dark: #CFCAC0;

  color: var(--foreground);
  background: var(--background);
  font-family: "Microsoft YaHei", "PingFang SC", 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: 18px;
  background: var(--card);
  box-shadow: 0 22px 55px color-mix(in srgb,var(--foreground) 16%,transparent);
}

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

.brand-mark {
  display: grid;
  flex: 0 0 48px;
  height: 48px;
  place-items: center;
  border-radius: 14px;
  color: var(--foreground);
  background: var(--card);
  font-size: 24px;
  font-weight: 800;
}

.login-card header p { margin: 0 0 5px; color: var(--muted-on-dark); 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: 14px; font-weight: 700; }

input {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--input);
  border-radius: 9px;
  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: 9px;
  color: var(--card);
  background: var(--primary);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

button:hover { background: var(--foreground); }
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; }