/* ─── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  --color-bg-deep:      #0d0f1a;
  --color-bg-card:      #161929;
  --color-border:       rgba(255, 255, 255, 0.08);
  --color-accent:       #7c3aed;
  --color-accent-glow:  #a855f7;
  --color-accent-light: #c084fc;
  --color-text-primary: #f1f5f9;
  --color-text-muted:   #94a3b8;
  --color-error-bg:     rgba(239, 68, 68, 0.12);
  --color-error-text:   #fca5a5;
  --color-error-border: rgba(239, 68, 68, 0.4);
  --color-success:      #4ade80;
  --font-main:          'Outfit', system-ui, sans-serif;
  --radius-card:        1.5rem;
  --radius-input:       0.75rem;
  --radius-btn:         0.75rem;
  --shadow-card:        0 25px 60px rgba(0, 0, 0, 0.6), 0 0 0 1px var(--color-border);
  --shadow-glow:        0 0 40px rgba(124, 58, 237, 0.35);
  --transition-fast:    150ms ease;
}

/* ─── Reset & base ──────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: var(--font-main);
  background: var(--color-bg-deep);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
}

/* ─── Background ─────────────────────────────────────────────────────────────── */
.auth-bg {
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(124, 58, 237, 0.18) 0%, transparent 70%),
    var(--color-bg-deep);
}

/* Animated star field */
.stars {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 25% 40%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 45% 20%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 60% 70%, rgba(255,255,255,0.3) 0%, transparent 100%),
    radial-gradient(1px 1px at 75% 30%, rgba(255,255,255,0.6) 0%, transparent 100%),
    radial-gradient(1px 1px at 85% 55%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(1px 1px at 35% 80%, rgba(255,255,255,0.5) 0%, transparent 100%),
    radial-gradient(1px 1px at 90% 10%, rgba(255,255,255,0.4) 0%, transparent 100%),
    radial-gradient(2px 2px at 55% 50%, rgba(168, 85, 247, 0.6) 0%, transparent 100%),
    radial-gradient(2px 2px at 20% 65%, rgba(168, 85, 247, 0.4) 0%, transparent 100%);
  animation: twinkle 6s ease-in-out infinite alternate;
}

@keyframes twinkle {
  from { opacity: 0.6; }
  to   { opacity: 1; }
}

/* ─── Card ───────────────────────────────────────────────────────────────────── */
.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-card), var(--shadow-glow);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  animation: cardIn 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) both;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* ─── Logo & title ───────────────────────────────────────────────────────────── */
.auth-logo {
  font-size: 4rem;
  line-height: 1;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 0 18px rgba(168, 85, 247, 0.7));
  animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

.auth-title {
  font-size: 2.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, #c084fc 0%, #e879f9 50%, #f0abfc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.25rem;
}

.auth-subtitle {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin-bottom: 2rem;
}

/* ─── Form ───────────────────────────────────────────────────────────────────── */
.auth-form {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.field-input {
  width: 100%;
  padding: 0.8rem 1rem;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-input);
  color: var(--color-text-primary);
  font-family: var(--font-main);
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.field-input::placeholder { color: rgba(148, 163, 184, 0.45); }

.field-input:focus {
  border-color: var(--color-accent-glow);
  box-shadow: 0 0 0 3px rgba(168, 85, 247, 0.2);
}

/* ─── Error message ──────────────────────────────────────────────────────────── */
.error-message {
  padding: 0.75rem 1rem;
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius-input);
  color: var(--color-error-text);
  font-size: 0.9rem;
  text-align: center;
  animation: fadeIn 0.2s ease;
}

.error-message[hidden] { display: none; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── Button ─────────────────────────────────────────────────────────────────── */
.btn-primary {
  width: 100%;
  padding: 0.9rem 1.5rem;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-glow) 100%);
  border: none;
  border-radius: var(--radius-btn);
  color: #fff;
  font-family: var(--font-main);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.02em;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  box-shadow: 0 4px 20px rgba(124, 58, 237, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(rgba(255,255,255,0.15), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.btn-primary:hover:not(:disabled)::after { opacity: 1; }
.btn-primary:hover:not(:disabled) { transform: translateY(-2px); box-shadow: 0 8px 28px rgba(124, 58, 237, 0.65); }
.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled { opacity: 0.7; cursor: not-allowed; }

/* ─── Footer ─────────────────────────────────────────────────────────────────── */
.auth-footer {
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  position: relative;
  z-index: 1;
}

.auth-footer-link {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.auth-footer-link:hover { color: var(--color-accent-glow); text-decoration: underline; }
.auth-footer-sep { opacity: 0.4; }