/* ==================== ROOT VARIABLES ==================== */
:root {
  /* Background */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FA;
  --bg-input: #F8F9FA;
  --bg-input-focus: #FFFFFF;
  --bg-overlay: rgba(248, 249, 250, 0.95);
  --bg-card-solid: #FFFFFF;

  /* Text */
  --text-primary: #212121;
  --text-secondary: #6C757D;
  --text-muted: #9E9E9E;

  /* Accent */
  --accent-primary: #7C4DFF;
  --accent-secondary: #FF4081;
  --accent-gold: #D4A843;
  --accent-success: #4CAF50;
  --accent-error: #FF5252;
  --accent-warning: #FFB74D;
  --accent-info: #64B5F6;

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #7C4DFF, #FF4081);
  --gradient-primary-reverse: linear-gradient(135deg, #FF4081, #7C4DFF);
  --gradient-gold: linear-gradient(135deg, #D4A843, #F0D078);
  --gradient-gold-full: linear-gradient(135deg, #D4A843, #F0D078, #B8860B);
  --gradient-card-border: linear-gradient(135deg, #7C4DFF, #FF4081);

  /* Borders */
  --border-subtle: #E0E0E0;
  --border-input: #E0E0E0;
  --border-focus: #7C4DFF;
  --border-error: #FF5252;

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow-primary: 0 8px 28px rgba(124, 77, 255, 0.3);
  --shadow-button: 0 4px 16px rgba(124, 77, 255, 0.3);
  --shadow-button-hover: 0 6px 24px rgba(124, 77, 255, 0.4);
  --shadow-toast: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* Border Radius */
  --radius-xs: 4px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 50%;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 20px;
  --spacing-2xl: 24px;
  --spacing-3xl: 32px;

  /* Font Sizes */
  --font-xs: 10px;
  --font-sm: 11px;
  --font-md: 12px;
  --font-lg: 13px;
  --font-xl: 14px;
  --font-2xl: 15px;
  --font-3xl: 18px;
  --font-4xl: 22px;
  --font-5xl: 32px;

  /* Z-Index */
  --z-base: 1;
  --z-card: 10;
  --z-modal: 100;
  --z-toast: 200;
  --z-loading: 9999;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  position: fixed;
  width: 100%;
}

body {
  font-family: 'Vazirmatn', sans-serif;
  background: var(--bg-secondary);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  height: 100vh;
  height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  direction: rtl;
  overflow: hidden;
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  overscroll-behavior: none;
  position: fixed;
  width: 100%;
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
  width: 4px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: rgba(0, 0, 0, 0.1);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(0, 0, 0, 0.2);
}

/* ==================== SELECTION ==================== */
::selection {
  background: rgba(124, 77, 255, 0.2);
  color: #212121;
}

/* ==================== LOADING OVERLAY ==================== */
#loadingOverlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  z-index: var(--z-loading);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xl);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

#loadingOverlay.active {
  opacity: 1;
  pointer-events: all;
}

.loader-ring {
  width: 48px;
  height: 48px;
  border: 3px solid rgba(124, 77, 255, 0.15);
  border-top-color: var(--accent-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loader-text {
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-lg);
  color: var(--text-secondary);
  font-weight: 500;
}

/* ==================== MAIN WRAPPER ==================== */
.login-wrapper {
  position: relative;
  z-index: var(--z-base);
  width: 100%;
  max-width: 420px;
  padding: var(--spacing-xl);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xl);
  height: 100vh;
  height: 100dvh;
  justify-content: center;
  overflow: hidden;
}

/* ==================== LOGIN CARD ==================== */
.login-card {
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  background: var(--bg-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--spacing-3xl) var(--spacing-2xl) var(--spacing-2xl);
  box-shadow: var(--shadow-card);
  position: relative;
  animation: cardEntry 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.login-card::-webkit-scrollbar {
  display: none;
}

@keyframes cardEntry {
  0% { opacity: 0; transform: translateY(20px) scale(0.98); }
  100% { opacity: 1; transform: translateY(0) scale(1); }
}

.login-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-card-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

/* ==================== LOGO SECTION ==================== */
.login-logo-section {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.login-logo {
  width: 72px;
  height: 72px;
  margin: 0 auto var(--spacing-md);
  background: var(--gradient-primary);
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-glow-primary);
}

.logo-glow {
  position: absolute;
  inset: -8px;
  border-radius: inherit;
  background: var(--gradient-primary);
  opacity: 0.2;
  filter: blur(16px);
}

.logo-icon {
  font-size: var(--font-5xl);
  position: relative;
  z-index: 1;
}

.login-title {
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-4xl);
  font-weight: 900;
  color: var(--text-primary);
  letter-spacing: 2px;
}

.title-highlight {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.login-subtitle {
  font-size: var(--font-md);
  color: var(--text-secondary);
  margin-top: var(--spacing-xs);
  font-weight: 400;
}

/* ==================== DIVIDER ==================== */
.divider {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

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

.divider-text {
  font-size: var(--font-sm);
  color: var(--text-muted);
  white-space: nowrap;
  font-weight: 500;
}

/* ==================== TAB SWITCHER ==================== */
.tab-switcher {
  display: flex;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-xl);
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs);
}

.tab-btn {
  flex: 1;
  padding: 10px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-lg);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.tab-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-base);
  border-radius: var(--radius-sm);
}

.tab-btn:hover {
  color: var(--text-secondary);
  background: rgba(124, 77, 255, 0.05);
}

.tab-btn.active {
  color: #fff;
  box-shadow: var(--shadow-button);
}

.tab-btn.active::before {
  opacity: 1;
}

.tab-btn i,
.tab-btn span {
  position: relative;
  z-index: 1;
}

.tab-btn i {
  font-size: var(--font-xl);
}

/* ==================== AUTH FORMS ==================== */
.auth-form {
  display: none;
  flex-direction: column;
  gap: var(--spacing-lg);
  animation: formSlideIn 0.4s ease;
}

.auth-form.active {
  display: flex;
}

@keyframes formSlideIn {
  0% { opacity: 0; transform: translateY(10px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ==================== INPUT GROUPS ==================== */
.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon-wrapper {
  position: absolute;
  right: 14px;
  z-index: 1;
  color: var(--text-muted);
  font-size: var(--font-2xl);
  pointer-events: none;
  transition: color var(--transition-base);
}

.input-group:focus-within .input-icon-wrapper {
  color: var(--accent-primary);
}

.auth-input {
  width: 100%;
  padding: 14px 42px 14px 16px;
  background: var(--bg-input);
  border: 2px solid var(--border-input);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-xl);
  transition: all var(--transition-base);
  outline: none;
}

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

.auth-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 4px rgba(124, 77, 255, 0.1);
  background: var(--bg-input-focus);
}

.auth-input.error {
  border-color: var(--border-error);
  box-shadow: 0 0 0 3px rgba(255, 82, 82, 0.1);
}

.toggle-password {
  position: absolute;
  left: 12px;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--spacing-xs);
  font-size: var(--font-xl);
  transition: color var(--transition-fast);
  z-index: 1;
}

.toggle-password:hover {
  color: var(--text-secondary);
}

/* ==================== FORM OPTIONS ==================== */
.form-options {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: var(--font-md);
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.checkbox-label input {
  display: none;
}

.checkmark {
  width: 18px;
  height: 18px;
  border: 2px solid var(--border-input);
  border-radius: var(--radius-xs);
  position: relative;
  transition: all var(--transition-base);
  flex-shrink: 0;
}

.checkbox-label:hover .checkmark {
  border-color: var(--border-focus);
}

.checkbox-label input:checked+.checkmark {
  background: var(--gradient-primary);
  border-color: transparent;
}

.checkbox-label input:checked+.checkmark::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: #fff;
  font-size: var(--font-sm);
  font-weight: 700;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent-secondary);
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-md);
  cursor: pointer;
  transition: color var(--transition-fast);
  font-weight: 500;
}

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

/* ==================== PASSWORD STRENGTH ==================== */
.password-strength {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.strength-bar {
  flex: 1;
  height: 4px;
  background: #E0E0E0;
  border-radius: 2px;
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  border-radius: 2px;
  transition: all var(--transition-slow);
  width: 0;
}

.strength-fill.weak { width: 25%; background: var(--accent-error); }
.strength-fill.medium { width: 50%; background: var(--accent-warning); }
.strength-fill.strong { width: 75%; background: var(--accent-secondary); }
.strength-fill.very-strong { width: 100%; background: var(--accent-success); }

.strength-text {
  font-size: var(--font-sm);
  color: var(--text-muted);
  min-width: 70px;
  font-weight: 500;
  transition: color var(--transition-base);
}

/* ==================== BUTTONS ==================== */
.btn {
  padding: 12px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-xl);
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--shadow-button);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: var(--shadow-button-hover);
}

.btn-primary:active:not(:disabled) {
  transform: scale(0.97);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
}

.btn-ghost:hover:not(:disabled) {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.btn-lg {
  width: 100%;
  padding: 14px;
  font-size: var(--font-2xl);
}

/* ==================== SOCIAL LOGIN ==================== */
.social-section {
  margin-top: var(--spacing-xs);
}

.social-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

.social-btn {
  flex: 1;
  padding: var(--spacing-md);
  border: 1px solid var(--border-input);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-lg);
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all var(--transition-base);
}

.social-btn:hover {
  background: var(--bg-secondary);
  border-color: var(--border-focus);
  transform: translateY(-1px);
}

.social-btn:active {
  transform: scale(0.97);
}

.google-icon {
  flex-shrink: 0;
}

/* ==================== GUEST SECTION ==================== */
.guest-section {
  margin-top: var(--spacing-sm);
}

.guest-section .btn-ghost {
  font-size: var(--font-lg);
  opacity: 0.8;
}

.guest-section .btn-ghost:hover {
  opacity: 1;
}

/* ==================== FOOTER ==================== */
.login-footer {
  text-align: center;
  margin-top: var(--spacing-lg);
  font-size: var(--font-xs);
  color: var(--text-muted);
  line-height: 1.8;
}

.login-footer p {
  margin: var(--spacing-xs) 0;
}

.link-text {
  color: var(--accent-primary);
  cursor: pointer;
  transition: color var(--transition-fast);
  font-weight: 500;
}

.link-text:hover {
  color: var(--accent-secondary);
}

.copyright {
  opacity: 0.7;
}

/* ==================== BACK LINK ==================== */
.back-home {
  color: var(--text-muted);
  font-size: var(--font-md);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  transition: color var(--transition-base);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
}

.back-home:hover {
  color: var(--accent-primary);
  background: var(--bg-secondary);
}

/* ==================== MODALS ==================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  padding: var(--spacing-xl);
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background: var(--bg-card-solid);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  max-width: 380px;
  width: 100%;
  text-align: center;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  animation: modalEntry 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes modalEntry {
  0% { opacity: 0; transform: scale(0.95) translateY(10px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-icon {
  font-size: 48px;
  margin-bottom: var(--spacing-md);
}

.modal-title {
  font-size: var(--font-3xl);
  font-weight: 800;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.modal-text {
  font-size: var(--font-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
}

.modal-hint {
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
}

.terms-list {
  list-style: none;
  text-align: right;
  margin-bottom: var(--spacing-lg);
}

.terms-list li {
  font-size: var(--font-md);
  color: var(--text-secondary);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid #F0F0F0;
}

.terms-list li::before {
  content: '• ';
  color: var(--accent-primary);
  font-weight: 700;
}

.terms-list li:last-child {
  border-bottom: none;
}

/* ==================== RESET INFO ==================== */
.reset-info {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md);
  background: rgba(124, 77, 255, 0.06);
  border-radius: var(--radius-sm);
}

.reset-info i {
  font-size: 20px;
  color: var(--accent-primary);
}

.reset-info p {
  font-size: var(--font-md);
  color: var(--text-secondary);
}

/* ==================== TOAST AREA ==================== */
.toast-area {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  pointer-events: none;
  max-width: 380px;
  width: 90%;
}

.toast {
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-family: 'Vazirmatn', sans-serif;
  font-size: var(--font-lg);
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  box-shadow: var(--shadow-toast);
  pointer-events: all;
  cursor: pointer;
  opacity: 0;
  transform: translateY(-20px);
  transition: all var(--transition-base);
}

.toast.show { opacity: 1; transform: translateY(0); }
.toast.out { opacity: 0; transform: translateY(-20px); }

.toast i { font-size: var(--font-xl); flex-shrink: 0; }
.toast span { flex: 1; }

.toast.info { background: #E3F2FD; color: #1565C0; border: 1px solid #BBDEFB; }
.toast.success { background: #E8F5E9; color: #2E7D32; border: 1px solid #C8E6C9; }
.toast.error { background: #FFEBEE; color: #C62828; border: 1px solid #FFCDD2; }
.toast.warning { background: #FFF8E1; color: #E65100; border: 1px solid #FFECB3; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 440px) {
  .login-wrapper { padding: var(--spacing-lg); gap: var(--spacing-lg); }
  .login-card { padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-xl); border-radius: var(--radius-md); max-height: 88vh; }
  .login-title { font-size: var(--font-3xl); }
  .login-logo { width: 60px; height: 60px; }
  .logo-icon { font-size: 28px; }
  .tab-btn { font-size: var(--font-md); padding: 8px; }
  .auth-input { padding: 12px 38px 12px 14px; font-size: var(--font-lg); }
  .btn-lg { padding: 12px; font-size: var(--font-xl); }
  .social-btn { font-size: var(--font-md); padding: 10px; }
  .modal-content { padding: var(--spacing-xl) var(--spacing-lg); }
}

@media (max-width: 360px) {
  .login-card { padding: var(--spacing-xl) var(--spacing-md) var(--spacing-lg); }
  .tab-switcher { gap: 2px; }
  .tab-btn { font-size: var(--font-xs); padding: 8px 6px; }
  .form-options { flex-direction: column; align-items: flex-start; gap: var(--spacing-sm); }
}