/* Minimal centered login aligned with the 408 application's light theme. */
:root {
  --canvas: #f6f7f9;
  --canvas-soft: #fbfcfd;
  --surface: #ffffff;
  --ink: #111827;
  --ink-soft: #414f63;
  --muted: #667085;
  --line: #e4e7ec;
  --line-strong: #cfd4dc;
  --accent: #4338ca;
  --accent-hover: #3730a3;
  --accent-soft: #eef0fc;
  --focus-ring: rgba(67, 56, 202, .15);
  --danger: #b42318;
  --danger-soft: #fef3f2;
  --danger-line: #fecdca;
  --radius-sm: 6px;
  --radius-md: 7px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 18px 42px rgba(16, 24, 40, .07);
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --ease: cubic-bezier(.2, .65, .35, 1);
  --dur: .16s;
}

* { box-sizing: border-box; }
html { color-scheme: light; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 24px;
  background: linear-gradient(180deg, var(--canvas-soft) 0%, var(--canvas) 100%);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.login-shell {
  width: 100%;
  display: grid;
  place-items: center;
}

.login-card {
  width: min(400px, 100%);
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.login-form {
  margin: 0;
  display: grid;
  gap: 15px;
}

.login-brand {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 680;
}

h1 {
  margin: 0;
  color: var(--ink);
  font-size: 26px;
  line-height: 1.2;
  font-weight: 680;
}

.login-subtitle {
  margin: -5px 0 15px;
  color: var(--muted);
}

.field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

label {
  color: var(--ink-soft);
  font-size: 13px;
  font-weight: 570;
}

input {
  width: 100%;
  height: 44px;
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 0 12px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

input::placeholder { color: var(--muted); }
input:hover { border-color: var(--line-strong); }

input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.error {
  min-height: 0;
  margin: 0;
  color: var(--danger);
  font-size: 13px;
}

.error:not(:empty) {
  min-height: 34px;
  padding: 7px 10px;
  border: 1px solid var(--danger-line);
  border-radius: var(--radius-sm);
  background: var(--danger-soft);
}

.login-submit {
  height: 45px;
  margin-top: 4px;
  border: 0;
  border-radius: var(--radius-md);
  background: var(--accent);
  color: #fff;
  font: inherit;
  font-size: 15px;
  font-weight: 640;
  cursor: pointer;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.login-submit:hover { background: var(--accent-hover); }
.login-submit:active { transform: translateY(1px); }

:focus-visible {
  outline: 2.5px solid var(--accent);
  outline-offset: 2px;
}

@media (max-width: 480px) {
  body { padding: 16px; }
  .login-card {
    padding: 26px 20px;
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 10px 28px rgba(16, 24, 40, .06);
  }
  h1 { font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}