:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --border: #e2e4e9;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --primary: #2f5fef;
  --primary-hover: #2249c9;
  --danger: #d92d20;
  --danger-bg: #fef3f2;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.05), 0 4px 16px rgba(16, 24, 40, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --surface: #1c1f26;
    --border: #2b2f38;
    --text: #edeef0;
    --text-muted: #9aa0ab;
    --primary: #5b82ff;
    --primary-hover: #7b9aff;
    --danger: #f97066;
    --danger-bg: #2a1716;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.center-screen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 32px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 15px;
}

.brand-name {
  font-weight: 600;
  font-size: 15px;
}

.brand-sub {
  color: var(--text-muted);
  font-size: 12px;
}

h1 {
  font-size: 20px;
  margin: 0 0 4px;
}

.subtitle {
  color: var(--text-muted);
  font-size: 14px;
  margin: 0 0 24px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 6px;
}

.field {
  margin-bottom: 16px;
}

input[type="email"],
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s ease;
}

input:focus {
  border-color: var(--primary);
}

button {
  width: 100%;
  padding: 11px 12px;
  border: none;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

button:hover:not(:disabled) {
  background: var(--primary-hover);
}

button:disabled {
  opacity: 0.6;
  cursor: default;
}

.error-banner {
  display: none;
  background: var(--danger-bg);
  color: var(--danger);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: 13px;
  margin-bottom: 16px;
}

.error-banner.visible {
  display: block;
}

.foot-note {
  margin-top: 20px;
  font-size: 12px;
  color: var(--text-muted);
  text-align: center;
}

/* Dashboard */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.app-main {
  padding: 32px 24px;
  max-width: 720px;
  margin: 0 auto;
}

.user-chip {
  display: flex;
  align-items: center;
  gap: 10px;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
}

.logout-link {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  width: auto;
  padding: 7px 14px;
  font-weight: 500;
}

.logout-link:hover:not(:disabled) {
  background: var(--bg);
  color: var(--text);
}

.welcome-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
}

.status-line {
  color: var(--text-muted);
  font-size: 13px;
}