:root {
  --ff-heading: 'Space Grotesk', sans-serif;
  --ff-body: 'Inter', sans-serif;
  --radius-sm: 8px;
  --radius-lg: 22px;
  --transition: 0.25s cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --bg-primary: #0a0f0d;
  --bg-card: #15201a;
  --bg-input: #0f1813;
  --border: rgba(255,255,255,.08);
  --border-accent: rgba(34,197,94,.45);
  --text-primary: #f0fdf4;
  --text-secondary: #a3c4b0;
  --text-muted: #5f8a6e;
  --accent: #22c55e;
  --accent-glow: rgba(34,197,94,.35);
  --gradient-hero: linear-gradient(165deg, #0a0f0d 0%, #0d1a12 40%, #112216 100%);
  --gradient-accent: linear-gradient(135deg, #22c55e, #16a34a);
  --error: #f87171;
  --error-bg: rgba(248,113,113,.10);
  --success-bg: rgba(34,197,94,.10);
  color-scheme: dark;
}

[data-theme="light"] {
  --bg-primary: #f8faf9;
  --bg-card: #ffffff;
  --bg-input: #f8faf9;
  --border: rgba(0,0,0,.10);
  --border-accent: rgba(22,163,74,.55);
  --text-primary: #052e16;
  --text-secondary: #3f6b52;
  --text-muted: #7ba390;
  --accent: #16a34a;
  --accent-glow: rgba(22,163,74,.18);
  --gradient-hero: linear-gradient(165deg, #f8faf9 0%, #ecfdf5 40%, #dcfce7 100%);
  --gradient-accent: linear-gradient(135deg, #16a34a, #15803d);
  --error: #dc2626;
  --error-bg: rgba(220,38,38,.07);
  --success-bg: rgba(22,163,74,.08);
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 32px 16px;
  font-family: var(--ff-body);
  background: var(--bg-primary);
  background-image: var(--gradient-hero);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

.auth-card {
  width: 100%; max-width: 440px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: 0 12px 48px rgba(0,0,0,.18);
}
.auth-card.wide { max-width: 520px; }
@media (max-width: 480px) { .auth-card { padding: 28px 20px; } }

.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: var(--ff-heading); font-weight: 700; font-size: 1.25rem;
  color: var(--text-primary); text-decoration: none;
  margin-bottom: 28px;
}
.brand svg { width: 30px; height: 30px; color: var(--text-primary); }
.brand .accent { color: var(--accent); }
.brand sup { font-size: .55em; margin-left: 1px; }

h1 {
  font-family: var(--ff-heading); font-size: 1.6rem; font-weight: 700;
  letter-spacing: -.01em; margin-bottom: 6px;
}
.subtitle { color: var(--text-secondary); font-size: .92rem; margin-bottom: 26px; line-height: 1.5; }

.row { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 480px) { .row { grid-template-columns: 1fr; gap: 0; } }

.field { margin-bottom: 16px; }
.field label {
  display: block; font-size: .82rem; font-weight: 600;
  color: var(--text-secondary); margin-bottom: 6px;
}
.field input {
  width: 100%; padding: 11px 14px;
  font: inherit; font-size: .95rem; color: var(--text-primary);
  background: var(--bg-input);
  border: 1px solid var(--border); border-radius: var(--radius-sm);
  outline: none; transition: border-color var(--transition), box-shadow var(--transition);
}
.field input:focus { border-color: var(--border-accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.field.invalid input { border-color: var(--error); }
.field .error { display: none; color: var(--error); font-size: .8rem; margin-top: 5px; }
.field.invalid .error { display: block; }

.password-wrap { position: relative; }
.password-wrap input { padding-right: 62px; }
.toggle-pw {
  position: absolute; right: 8px; top: 50%; transform: translateY(-50%);
  background: none; border: none; cursor: pointer;
  color: var(--text-muted); font: 600 .75rem var(--ff-body); padding: 6px;
}
.toggle-pw:hover { color: var(--accent); }

.hint { color: var(--text-muted); font-size: .78rem; margin-top: 5px; }

.label-row { display: flex; justify-content: space-between; align-items: baseline; }
.label-row a { font-size: .8rem; }

a { color: var(--accent); text-decoration: none; font-weight: 600; }
a:hover { text-decoration: underline; }

.btn {
  width: 100%; margin-top: 8px; padding: 12px 22px;
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; border-radius: var(--radius-sm); cursor: pointer;
  font: 600 .95rem var(--ff-body); color: #fff;
  background: var(--gradient-accent);
  box-shadow: 0 2px 12px var(--accent-glow);
  transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--accent-glow); }
.btn:disabled { opacity: .6; cursor: wait; transform: none; }

.alert {
  display: none; padding: 11px 14px; border-radius: var(--radius-sm);
  font-size: .88rem; line-height: 1.45; margin-bottom: 18px;
}
.alert.show { display: block; }
.alert.error { background: var(--error-bg); color: var(--error); }
.alert.success { background: var(--success-bg); color: var(--accent); }

.footer-text { text-align: center; color: var(--text-secondary); font-size: .88rem; margin-top: 22px; }