/**
 * Login Page CSS
 * 로그인 / 회원가입 페이지 스타일
 */

/* ======================================== */
/* Layout */
/* ======================================== */

.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  background: var(--bg);
}

.login-card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-1);
  padding: var(--spacing-2xl);
  width: 100%;
  max-width: 400px;
}

/* ======================================== */
/* Logo / Header */
/* ======================================== */

.login-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.login-logo {
  width: 56px;
  height: 56px;
  background: var(--primary);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
}

.login-logo .material-icons {
  font-size: 32px;
  color: #ffffff;
}

.login-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.login-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ======================================== */
/* Tabs */
/* ======================================== */

.login-tabs {
  display: flex;
  gap: var(--spacing-xs);
  background: var(--bg);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: var(--spacing-xl);
}

.login-tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.login-tab--active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: var(--shadow-1);
}

/* ======================================== */
/* Forms */
/* ======================================== */

.login-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.login-form--hidden {
  display: none;
}

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

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-input {
  width: 100%;
  padding: 12px var(--spacing-md);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--surface);
  outline: none;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

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

.form-input--error {
  border-color: var(--danger);
}

.form-input--error:focus {
  box-shadow: 0 0 0 3px rgba(217, 48, 37, 0.2);
}

.field-error {
  font-size: var(--font-size-xs);
  color: var(--danger);
  display: none;
}

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

/* ======================================== */
/* Submit Button */
/* ======================================== */

.login-btn {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
  margin-top: var(--spacing-xs);
}

.login-btn:hover {
  background: var(--primary-hover);
}

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

.login-btn:disabled {
  background: var(--border);
  cursor: not-allowed;
  transform: none;
}

/* ======================================== */
/* Alert / Toast */
/* ======================================== */

.login-alert {
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  display: none;
  align-items: center;
  gap: var(--spacing-sm);
}

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

.login-alert--error {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger);
}

.login-alert--success {
  background: var(--success-bg);
  color: var(--success);
  border: 1px solid var(--success);
}

.login-alert .material-icons {
  font-size: 18px;
  flex-shrink: 0;
}

/* ======================================== */
/* Footer / Switch link */
/* ======================================== */

.login-footer {
  text-align: center;
  margin-top: var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.login-footer__link {
  color: var(--primary);
  font-weight: 500;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-color: transparent;
  transition: text-decoration-color var(--transition-fast);
}

.login-footer__link:hover {
  text-decoration-color: var(--primary);
}

/* ======================================== */
/* Loading spinner inside button */
/* ======================================== */

.btn-spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 6px;
}

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

/* ======================================== */
/* Agreement section */
/* ======================================== */

.agreement-section {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.agreement-divider {
  height: 1px;
  background: var(--border-light);
  margin: 8px 0;
}

.agreement-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 13px;
  color: var(--text-primary);
  cursor: pointer;
}

.agreement-item--all {
  font-weight: 600;
  font-size: 14px;
}

.agreement-item input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--primary);
  flex-shrink: 0;
}

.agreement-item span {
  flex: 1;
}

.agreement-tag {
  font-style: normal;
  font-weight: 600;
  color: var(--primary);
  font-size: 12px;
}

.agreement-tag--optional {
  color: var(--text-tertiary);
  font-weight: 400;
}

.agreement-link {
  font-size: 12px;
  color: var(--text-secondary);
  text-decoration: underline;
  flex-shrink: 0;
}

.agreement-link:hover {
  color: var(--primary);
}

/* ======================================== */
/* Forgot Password Link */
/* ======================================== */

.forgot-password-link {
  text-align: right;
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.forgot-password-link a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.forgot-password-link a:hover {
  color: var(--primary);
  text-decoration: underline;
}

/* ======================================== */
/* Inline Error Message */
/* ======================================== */

.error-message {
  padding: var(--spacing-sm) var(--spacing-md);
  margin-bottom: var(--spacing-md);
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 500;
  text-align: center;
}

/* Shake animation for login form on credential error */
@keyframes shake {
  0%  { transform: translateX(0); }
  15% { transform: translateX(-6px); }
  30% { transform: translateX(6px); }
  45% { transform: translateX(-5px); }
  60% { transform: translateX(5px); }
  75% { transform: translateX(-3px); }
  90% { transform: translateX(3px); }
  100% { transform: translateX(0); }
}

.shake {
  animation: shake 0.5s ease;
}

/* ======================================== */
/* Social Login Section */
/* ======================================== */

.social-login-section {
  margin-bottom: var(--spacing-md);
  position: relative;
}

.social-login-section--loading {
  opacity: 0.6;
  pointer-events: none;
}

.social-login-section--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.google-login-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  width: 100%;
  padding: 12px 16px;
  border: 1px solid var(--border, #dadce0);
  border-radius: var(--radius-md, 8px);
  background: #fff;
  color: #3c4043;
  font-size: 15px;
  font-weight: 500;
  font-family: 'Pretendard Variable', -apple-system, sans-serif;
  cursor: pointer;
  transition: background-color 0.2s, box-shadow 0.2s;
}

.google-login-btn:hover {
  background-color: #f7f8f8;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.google-login-btn:active {
  background-color: #eee;
}

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

.google-login-btn__text {
  white-space: nowrap;
}

/* ======================================== */
/* Login Divider ("또는") */
/* ======================================== */

.login-divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

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

.login-divider__text {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  white-space: nowrap;
}

/* ======================================== */
/* Social Signup Form */
/* ======================================== */

.social-signup-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.social-signup-header {
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.social-signup-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
}

.social-signup-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.social-signup-cancel {
  width: 100%;
  padding: 12px;
  background: transparent;
  color: var(--text-secondary);
  border: 1.5px solid var(--border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.social-signup-cancel:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}

/* ======================================== */
/* Token Display (개발용) */
/* ======================================== */

.dev-token-box {
  margin-top: var(--spacing-md);
  padding: var(--spacing-md);
  background: var(--bg);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
  word-break: break-all;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.dev-token-box__label {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
}

.dev-token-box__value {
  font-family: monospace;
  user-select: all;
}

.dev-token-box__link {
  display: inline-block;
  margin-top: var(--spacing-sm);
  color: var(--primary);
  font-weight: 500;
  text-decoration: none;
  font-size: var(--font-size-sm);
}

.dev-token-box__link:hover {
  text-decoration: underline;
}