/* ============================================================
   Syntro Build AI — Authentication Stylesheet
   Module 0 | Dark Mode | Responsive
   ============================================================ */

:root {
  --bg-base:        #0d0f14;
  --bg-card:        #161920;
  --bg-input:       #1e2330;
  --bg-input-focus: #242938;
  --border:         #252830;
  --border-focus:   #6c63ff;
  --text-primary:   #e2e8f0;
  --text-secondary: #a0a8b8;
  --text-muted:     #4a5568;
  --accent-start:   #6c63ff;
  --accent-end:     #4f8cff;
  --accent-solid:   #6c63ff;
  --success:        #48bb78;
  --danger:         #fc5c65;
  --warning:        #f6ad55;
  --radius-sm:      8px;
  --radius-md:      12px;
  --radius-lg:      16px;
  --shadow-card:    0 24px 64px rgba(0,0,0,.5);
  --transition:     0.18s ease;
}

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

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  line-height: 1.5;
}

/* ---- Ambient background glow ---- */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 600px 400px at 20% 10%, rgba(108,99,255,.08) 0%, transparent 70%),
    radial-gradient(ellipse 500px 350px at 80% 90%, rgba(79,140,255,.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   Auth wrapper
   ============================================================ */

.auth-wrapper {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 440px;
}

/* ---- Brand header ---- */
.auth-brand {
  text-align: center;
  margin-bottom: 32px;
}

.auth-brand__logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  margin-bottom: 8px;
}

.auth-brand__icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(108,99,255,.35);
  flex-shrink: 0;
}

.auth-brand__icon svg {
  width: 22px;
  height: 22px;
  fill: #fff;
}

.auth-brand__name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.3px;
}

.auth-brand__name span {
  background: linear-gradient(90deg, var(--accent-start), var(--accent-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.auth-brand__tagline {
  font-size: 13px;
  color: var(--text-muted);
  letter-spacing: .5px;
}

/* ---- Card ---- */
.auth-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-card);
}

.auth-card__title {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
  letter-spacing: -.3px;
}

.auth-card__subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 28px;
  line-height: 1.5;
}

/* ============================================================
   Form elements
   ============================================================ */

.form-group {
  margin-bottom: 18px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 7px;
  letter-spacing: .2px;
}

.form-control {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 15px;
  padding: 11px 14px;
  outline: none;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  font-family: inherit;
  -webkit-appearance: none;
}

.form-control:focus {
  border-color: var(--border-focus);
  background: var(--bg-input-focus);
  box-shadow: 0 0 0 3px rgba(108,99,255,.15);
}

.form-control::placeholder { color: var(--text-muted); }

.form-control--error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(252,92,101,.12);
}

/* Password input wrapper */
.input-password {
  position: relative;
}

.input-password .form-control {
  padding-right: 44px;
}

.input-password__toggle {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  padding: 4px;
  transition: color var(--transition);
}

.input-password__toggle:hover { color: var(--text-secondary); }

/* ---- Password strength ---- */
.password-strength {
  margin-top: 8px;
}

.password-strength__bar {
  height: 3px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 5px;
}

.password-strength__fill {
  height: 100%;
  border-radius: 999px;
  transition: width .3s ease, background .3s ease;
  width: 0%;
}

.password-strength__label {
  font-size: 11px;
  color: var(--text-muted);
}

/* ---- Row helpers ---- */
.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 18px;
}

/* ---- Checkbox ---- */
.form-check {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.form-check__input {
  width: 17px;
  height: 17px;
  border: 1.5px solid var(--border);
  border-radius: 4px;
  background: var(--bg-input);
  cursor: pointer;
  flex-shrink: 0;
  accent-color: var(--accent-solid);
  transition: border-color var(--transition);
}

.form-check__input:checked { border-color: var(--accent-solid); }

.form-check__label {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ---- Links ---- */
.auth-link {
  color: var(--accent-solid);
  text-decoration: none;
  font-size: 13px;
  transition: color var(--transition);
}

.auth-link:hover { color: var(--accent-end); text-decoration: underline; }

/* ============================================================
   Buttons
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }

.btn--primary {
  width: 100%;
  padding: 13px 20px;
  font-size: 15px;
  background: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  color: #fff;
  box-shadow: 0 4px 18px rgba(108,99,255,.35);
  letter-spacing: .2px;
}

.btn--primary:hover:not(:disabled) {
  box-shadow: 0 6px 24px rgba(108,99,255,.5);
  opacity: .92;
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 10px 16px;
  font-size: 14px;
}

.btn--ghost:hover:not(:disabled) {
  border-color: var(--border-focus);
  color: var(--text-primary);
}

/* ---- Spinner inside button ---- */
.btn__spinner {
  width: 17px;
  height: 17px;
  border: 2px solid rgba(255,255,255,.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: none;
}

.btn--loading .btn__spinner { display: block; }
.btn--loading .btn__text { display: none; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   Alerts
   ============================================================ */

.alert {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 13px 15px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  line-height: 1.5;
  margin-bottom: 22px;
  border: 1px solid transparent;
}

.alert__icon { flex-shrink: 0; margin-top: 1px; }

.alert--error {
  background: rgba(252,92,101,.1);
  border-color: rgba(252,92,101,.25);
  color: #fc8c91;
}

.alert--success {
  background: rgba(72,187,120,.1);
  border-color: rgba(72,187,120,.25);
  color: #68d391;
}

.alert--info {
  background: rgba(108,99,255,.1);
  border-color: rgba(108,99,255,.25);
  color: #a89fff;
}

.alert--warning {
  background: rgba(246,173,85,.1);
  border-color: rgba(246,173,85,.25);
  color: #f6c26b;
}

/* ============================================================
   Divider
   ============================================================ */

.auth-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0;
  color: var(--text-muted);
  font-size: 13px;
}

.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ============================================================
   Footer links
   ============================================================ */

.auth-footer {
  text-align: center;
  margin-top: 22px;
  font-size: 14px;
  color: var(--text-secondary);
}

/* ============================================================
   Verification / info states
   ============================================================ */

.auth-icon-state {
  text-align: center;
  padding: 8px 0 24px;
}

.auth-icon-state__icon {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}

.auth-icon-state__icon--success {
  background: rgba(72,187,120,.12);
  border: 1px solid rgba(72,187,120,.25);
}

.auth-icon-state__icon--info {
  background: rgba(108,99,255,.12);
  border: 1px solid rgba(108,99,255,.25);
}

.auth-icon-state__icon--warning {
  background: rgba(246,173,85,.12);
  border: 1px solid rgba(246,173,85,.25);
}

.auth-icon-state__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.auth-icon-state__body {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 320px;
  margin: 0 auto 24px;
}

/* ============================================================
   Field error text
   ============================================================ */

.field-error {
  font-size: 12px;
  color: var(--danger);
  margin-top: 5px;
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ============================================================
   Responsive
   ============================================================ */

@media (max-width: 480px) {
  body { padding: 16px 12px; align-items: flex-start; padding-top: 32px; }

  .auth-card {
    padding: 28px 20px;
  }

  .auth-card__title { font-size: 20px; }

  .form-row { flex-direction: column; align-items: flex-start; gap: 8px; }
}