/* ============================================================
   LOGIN.CSS — Authentication Page Styles
   Math Tutor UI
   ============================================================ */

/* ── Page Layout ─────────────────────────────────────────── */

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
}

/* Liquid morphism blobs behind the card */
.login-page .liquid-blob:nth-child(1) {
  top: -10%;
  left: -10%;
  width: 420px;
  height: 420px;
  animation-delay: 0s;
}

.login-page .liquid-blob:nth-child(2) {
  bottom: -15%;
  right: -5%;
  width: 380px;
  height: 380px;
  animation-delay: -5s;
  animation-duration: 13s, 7s;
}

.login-page .liquid-blob:nth-child(3) {
  top: 40%;
  right: 15%;
  width: 250px;
  height: 250px;
  opacity: 0.1;
  animation-delay: -3s;
  animation-duration: 16s, 9s;
}

/* ── Login Card ──────────────────────────────────────────── */

.login-card {
  width: 100%;
  max-width: 440px;
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: var(--radius-2xl);
  border: 1px solid rgba(255, 255, 255, 0.14);
  box-shadow:
    0 8px 40px rgba(0, 0, 0, 0.5),
    inset 0 1px 0 rgba(255, 255, 255, 0.12);
  padding: var(--space-10) var(--space-8);
  position: relative;
  z-index: 10;
  animation: scaleIn 400ms var(--ease-spring) both;
  animation-delay: 100ms;
}

/* Animated border glow on card */
.login-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-2xl);
  background: linear-gradient(135deg, #00d9ff, #a855f7, #ec4899, #00d9ff);
  background-size: 300% 300%;
  animation: gradient-flow 5s ease infinite;
  z-index: -1;
  opacity: 0.3;
  border-radius: calc(var(--radius-2xl) + 1px);
}

/* ── Logo Area ───────────────────────────────────────────── */

.login-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: var(--space-8);
  animation: slideDown 300ms var(--ease-out) both;
  animation-delay: 200ms;
}

.login-logo-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, #00d9ff, #a855f7);
  background-size: 200% 200%;
  animation: liquid-btn 4s ease infinite;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: var(--space-4);
  box-shadow: 0 0 30px rgba(0, 217, 255, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
}

.login-logo h1 {
  font-size: var(--text-2xl);
  font-family: var(--font-heading);
  font-weight: 700;
  background: linear-gradient(135deg, #00d9ff, #a855f7);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: gradient-flow 5s ease infinite;
  letter-spacing: -0.02em;
}

.login-logo p {
  color: var(--text-muted);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

/* ── Form Elements ───────────────────────────────────────── */

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  animation: slideUp 300ms var(--ease-out) both;
  animation-delay: 250ms;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.form-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--transition-base);
  display: flex;
  align-items: center;
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4) var(--space-3) 42px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--text-base);
  font-family: var(--font-body);
  outline: none;
  transition:
    border-color var(--transition-base),
    background var(--transition-base),
    box-shadow var(--transition-base);
  -webkit-appearance: none;
}

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

.form-input:focus {
  border-color: var(--cyan);
  background: rgba(0, 217, 255, 0.05);
  box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.15), 0 0 20px rgba(0, 217, 255, 0.1);
}

.form-input:focus + .form-input-icon,
.form-input-wrap:focus-within .form-input-icon {
  color: var(--cyan);
}

/* Error state */
.form-group.has-error .form-input {
  border-color: var(--error);
  background: rgba(255, 0, 85, 0.05);
  box-shadow: 0 0 0 3px rgba(255, 0, 85, 0.15);
  animation: shake 300ms var(--ease-out);
}

.form-error {
  display: none;
  font-size: var(--text-xs);
  color: var(--error);
  align-items: center;
  gap: var(--space-1);
  animation: slideDown 200ms var(--ease-out) both;
}

.form-group.has-error .form-error {
  display: flex;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

/* Password toggle */
.btn-toggle-pw {
  position: absolute;
  right: 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
}
.btn-toggle-pw:hover { color: var(--text-secondary); }

/* ── Divider ─────────────────────────────────────────────── */

.login-divider {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  color: var(--text-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.login-divider::before,
.login-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
}

/* ── Buttons ─────────────────────────────────────────────── */

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-family: var(--font-body);
  font-weight: 500;
  cursor: pointer;
  transition:
    transform var(--transition-base),
    opacity var(--transition-base),
    box-shadow var(--transition-base);
  text-decoration: none;
  white-space: nowrap;
  -webkit-user-select: none;
  user-select: none;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none !important;
}

/* Primary — liquid gradient */
.btn-primary {
  background: linear-gradient(135deg, #00d9ff, #a855f7, #00b8d9);
  background-size: 250% 250%;
  animation: liquid-btn 4s ease infinite;
  color: #fff;
  width: 100%;
  padding: var(--space-4);
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.btn-primary:not(:disabled):hover {
  transform: translateY(-1px) scale(1.01);
  filter: brightness(1.1);
}

.btn-primary:not(:disabled):active {
  transform: scale(0.98);
  animation-play-state: paused;
}

/* Google OAuth button */
.btn-google {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  transition:
    background var(--transition-base),
    border-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.btn-google:hover {
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.btn-google:active {
  transform: scale(0.98);
}

.google-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ── Forgot Password / Switch Link ───────────────────────── */

.login-links {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.login-links a {
  color: var(--cyan);
  font-size: var(--text-sm);
  transition: opacity var(--transition-fast);
}
.login-links a:hover { opacity: 0.75; }

/* ── Loading state on button ─────────────────────────────── */

.btn-primary.loading {
  pointer-events: none;
}

.btn-primary.loading::after {
  content: '';
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  margin-left: var(--space-2);
}

/* ── Global Error Banner ─────────────────────────────────── */

.login-alert {
  display: none;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  align-items: center;
  gap: var(--space-2);
  animation: slideDown 200ms var(--ease-out) both;
}

.login-alert.show { display: flex; }

.login-alert.error {
  background: rgba(255, 0, 85, 0.12);
  border: 1px solid rgba(255, 0, 85, 0.3);
  color: #ff6688;
}

.login-alert.success {
  background: rgba(0, 255, 136, 0.1);
  border: 1px solid rgba(0, 255, 136, 0.3);
  color: #00ff88;
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 480px) {
  .login-card {
    padding: var(--space-8) var(--space-6);
    border-radius: var(--radius-xl);
    max-width: 100%;
  }

  .login-page {
    padding: var(--space-4);
    align-items: flex-start;
    padding-top: 10vh;
  }
}