/* =========================================================
   DESIGN TOKENS & ROOT CONFIG
========================================================= */
:root {
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --danger-500: #ef4444;
  --danger-600: #dc2626;
  --success-500: #10b981;
  
  --bg-main: #020617;
  --bg-panel: rgba(2, 6, 23, 0.85);
  --bg-soft: rgba(15, 23, 42, 0.95);
  
  --border-soft: rgba(148, 163, 184, 0.15);
  --border-medium: rgba(148, 163, 184, 0.25);
  
  --text-main: #e5e7eb;
  --text-muted: #94a3b8;
  --text-faint: #64748b;
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  --shadow-soft: 0 20px 40px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 60px rgba(59, 130, 246, 0.15);
  
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* =========================================================
   GLOBAL RESET
========================================================= */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--text-main);
  background: var(--bg-main);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

/* =========================================================
   STARFIELD BACKGROUND
========================================================= */
.space-background {
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse at top, #0f172a 0%, #020617 50%, #000000 100%);
  z-index: -10;
}

.stars-container {
  position: fixed;
  inset: 0;
  perspective: 1000px;
  overflow: hidden;
  z-index: -9;
}

.stars {
  position: absolute;
  inset: -50%;
  background-repeat: repeat;
  will-change: transform;
}

.stars-far {
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 80% 70%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 50% 50%, rgba(255,255,255,0.35), transparent);
  background-size: 400px 400px;
  animation: starsDriftSlow 240s linear infinite;
}

.stars-mid {
  background-image:
    radial-gradient(2px 2px at 40% 60%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 70% 20%, rgba(255,255,255,0.5), transparent);
  background-size: 300px 300px;
  animation: starsDriftMedium 180s linear infinite;
}

.stars-near {
  background-image:
    radial-gradient(3px 3px at 10% 80%, rgba(255,255,255,0.9), transparent),
    radial-gradient(2px 2px at 90% 30%, rgba(255,255,255,0.8), transparent);
  background-size: 200px 200px;
  animation: starsDriftFast 120s linear infinite;
}

@keyframes starsDriftSlow {
  from { transform: translateY(0); }
  to { transform: translateY(400px); }
}

@keyframes starsDriftMedium {
  from { transform: translateY(0); }
  to { transform: translateY(300px); }
}

@keyframes starsDriftFast {
  from { transform: translateY(0); }
  to { transform: translateY(200px); }
}

/* Ambient glow */
.ambient-glow {
  position: fixed;
  inset: -20%;
  background:
    radial-gradient(circle at 30% 30%, rgba(59, 130, 246, 0.15), transparent 40%),
    radial-gradient(circle at 70% 70%, rgba(168, 85, 247, 0.12), transparent 45%);
  animation: ambientFloat 30s ease-in-out infinite;
  z-index: -8;
  pointer-events: none;
}

@keyframes ambientFloat {
  0%, 100% { transform: translate(0, 0); }
  25% { transform: translate(-30px, 20px); }
  50% { transform: translate(20px, -30px); }
  75% { transform: translate(-20px, -20px); }
}

/* =========================================================
   MAIN CONTAINER
========================================================= */
.auth-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 16px;
  position: relative;
}

.auth-card {
  width: 100%;
  max-width: 460px;
  background: var(--bg-panel);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  box-shadow: var(--shadow-soft), var(--shadow-glow);
  position: relative;
  animation: fadeUp 0.8s var(--ease-smooth);
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Glassmorphic border highlight */
.auth-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  padding: 1px;
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.3),
    rgba(168, 85, 247, 0.2),
    rgba(59, 130, 246, 0.3));
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.5;
  pointer-events: none;
}

/* =========================================================
   HEADER
========================================================= */
.auth-header {
  text-align: center;
  margin-bottom: 28px;
}

.brand-container {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.brand-logo {
  position: relative;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(
    135deg,
    rgba(30, 41, 59, 0.85),
    rgba(15, 23, 42, 0.85)
  );
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 10px 30px rgba(0, 0, 0, 0.45),
    inset 0 1px 1px rgba(255, 255, 255, 0.06);
  transition: 
    transform 0.35s cubic-bezier(0.4, 0, 0.2, 1),
    box-shadow 0.35s ease;
  flex-shrink: 0;
}

.brand-logo::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    135deg,
    rgba(59, 130, 246, 0.45),
    rgba(168, 85, 247, 0.35),
    rgba(59, 130, 246, 0.45)
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0.45;
  pointer-events: none;
}

.brand-logo img {
  width: 72%;
  height: 72%;
  object-fit: contain;
  filter: drop-shadow(0 4px 12px rgba(59, 130, 246, 0.25));
  transition: transform 0.35s ease;
}

@media (hover: hover) {
  .brand-logo:hover {
    transform: translateY(-2px) scale(1.04);
    box-shadow:
      0 14px 45px rgba(0, 0, 0, 0.6),
      0 0 40px rgba(59, 130, 246, 0.35);
  }

  .brand-logo:hover img {
    transform: scale(1.08);
  }
}

.brand-title {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(135deg, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
}

.tagline {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

/* =========================================================
   MODE TOGGLE
========================================================= */
.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 24px;
  position: relative;
}

.mode-toggle button {
  padding: 10px 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  border-radius: calc(var(--radius-md) - 4px);
  transition: color 0.3s var(--ease-smooth);
  position: relative;
  z-index: 2;
  white-space: nowrap;
}

.mode-toggle button.active {
  color: #fff;
}

.mode-slider {
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 4px);
  height: calc(100% - 8px);
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  border-radius: calc(var(--radius-md) - 4px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  transition: transform 0.4s var(--ease-smooth);
  z-index: 1;
}

.mode-toggle.admin .mode-slider {
  transform: translateX(calc(100% + 6px));
  background: linear-gradient(135deg, var(--danger-600), var(--danger-500));
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

/* =========================================================
   AUTH TABS
========================================================= */
.auth-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  background: var(--bg-soft);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 24px;
  position: relative;
}

.auth-tabs button {
  padding: 10px 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 13px;
  cursor: pointer;
  border-radius: calc(var(--radius-md) - 4px);
  transition: color 0.3s var(--ease-smooth);
  position: relative;
  z-index: 2;
}

.auth-tabs button.active {
  color: #fff;
}

.tab-slider {
  position: absolute;
  top: 4px;
  left: 4px;
  width: calc(50% - 4px);
  height: calc(100% - 8px);
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  border-radius: calc(var(--radius-md) - 4px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
  transition: transform 0.4s var(--ease-smooth);
  z-index: 1;
}

.auth-tabs.signup .tab-slider {
  transform: translateX(calc(100% + 6px));
}

/* =========================================================
   FORMS
========================================================= */
.auth-content {
  position: relative;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group {
  position: relative;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 8px;
  letter-spacing: 0.3px;
}

.input-wrapper {
  position: relative;
}

.input-wrapper input {
  width: 100%;
  padding: 13px 40px 13px 14px;
  background: var(--bg-soft);
  border: 1.5px solid var(--border-soft);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-size: 15px;
  font-family: inherit;
  transition: all 0.3s var(--ease-smooth);
}

.input-wrapper input:focus {
  outline: none;
  border-color: var(--primary-500);
  background: rgba(15, 23, 42, 1);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

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

/* Input icons */
.input-icon {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 16px;
  transition: color 0.3s;
}

.input-wrapper input:focus ~ .input-icon {
  color: var(--primary-500);
}

/* Password toggle */
.password-toggle {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  font-size: 16px;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
}

.password-toggle:hover {
  color: var(--text-main);
  background: rgba(148, 163, 184, 0.1);
}

.password-toggle:active {
  transform: translateY(-50%) scale(0.95);
}

.eye-icon {
  display: block;
  line-height: 1;
}

/* =========================================================
   PASSWORD STRENGTH
========================================================= */
.password-strength {
  margin-top: 10px;
}

.strength-meter {
  width: 100%;
  height: 4px;
  background: rgba(148, 163, 184, 0.2);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 6px;
}

.strength-bar {
  height: 100%;
  width: 0%;
  border-radius: 2px;
  transition: all 0.4s var(--ease-smooth);
}

.strength-bar.weak {
  width: 25%;
  background: #ef4444;
}

.strength-bar.fair {
  width: 50%;
  background: #f59e0b;
}

.strength-bar.good {
  width: 75%;
  background: #eab308;
}

.strength-bar.strong {
  width: 100%;
  background: #10b981;
}

.strength-text {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

/* =========================================================
   BUTTONS
========================================================= */
.btn {
  width: 100%;
  padding: 13px 20px;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.3s var(--ease-smooth);
  position: relative;
  overflow: hidden;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
  color: #fff;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger-600), var(--danger-500));
  color: #fff;
  box-shadow: 0 4px 16px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(239, 68, 68, 0.4);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Loading state */
.btn-loading {
  pointer-events: none;
}

.btn-loading .btn-text {
  opacity: 0;
}

.btn-spinner {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2.5px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}

.btn-loading .btn-spinner {
  display: block;
}

@keyframes spin {
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

/* =========================================================
   OAUTH BUTTONS
========================================================= */
.divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 24px 0 18px;
  color: var(--text-faint);
  font-size: 12px;
  font-weight: 500;
}

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

.oauth-buttons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-oauth {
  width: 100%;
  padding: 11px 16px;
  border: 1.5px solid var(--border-medium);
  border-radius: var(--radius-md);
  background: var(--bg-soft);
  color: var(--text-main);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: all 0.3s var(--ease-smooth);
  font-family: inherit;
}

.btn-oauth:hover {
  background: rgba(15, 23, 42, 1);
  border-color: var(--border-medium);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.btn-oauth:active {
  transform: translateY(0);
}

.btn-oauth svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* =========================================================
   ERROR MESSAGES
========================================================= */
.error-message {
  padding: 11px 14px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: var(--radius-sm);
  color: #fca5a5;
  font-size: 13px;
  font-weight: 500;
  animation: shake 0.4s, fadeIn 0.3s;
  display: none;
}

.error-message.show {
  display: block;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-8px); }
  50% { transform: translateX(8px); }
  75% { transform: translateX(-8px); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* =========================================================
   FOOTER
========================================================= */
.auth-footer {
  margin-top: 24px;
  text-align: center;
  font-size: 11px;
  color: var(--text-faint);
  font-weight: 500;
  letter-spacing: 0.5px;
}

.forgot-password {
  text-align: right;
  margin-top: -4px;
}

.forgot-password a {
  color: var(--primary-500);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
  transition: color 0.2s;
}

.forgot-password a:hover {
  color: var(--primary-600);
  text-decoration: underline;
}

/* =========================================================
   ADMIN SECTION
========================================================= */
.admin-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(239, 68, 68, 0.15);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 999px;
  color: #fca5a5;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

/* =========================================================
   UTILITY CLASSES
========================================================= */
.hidden {
  display: none !important;
}

.fade-enter {
  animation: fadeIn 0.4s var(--ease-smooth);
}

.fade-exit {
  animation: fadeOut 0.3s var(--ease-smooth);
}

@keyframes fadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

/* =========================================================
   RESPONSIVE - TABLET
========================================================= */
@media (min-width: 481px) and (max-width: 768px) {
  .auth-card {
    padding: 36px 30px;
  }

  .brand-logo {
    width: 50px;
    height: 50px;
  }

  .brand-title {
    font-size: 26px;
  }
}

/* =========================================================
   RESPONSIVE - DESKTOP
========================================================= */
@media (min-width: 769px) {
  .auth-wrapper {
    padding: 20px;
  }

  .auth-card {
    padding: 48px 40px;
  }

  .brand-logo {
    width: 52px;
    height: 52px;
    border-radius: 14px;
  }

  .brand-title {
    font-size: 28px;
  }

  .tagline {
    font-size: 14px;
  }

  .mode-toggle button,
  .auth-tabs button {
    padding: 12px;
    font-size: 14px;
  }

  .mode-toggle,
  .auth-tabs {
    gap: 8px;
  }

  .mode-slider,
  .tab-slider {
    transform: translateX(0);
  }

  .mode-toggle.admin .mode-slider,
  .auth-tabs.signup .tab-slider {
    transform: translateX(calc(100% + 8px));
  }

  .auth-form {
    gap: 18px;
  }

  .input-wrapper input {
    padding: 14px 44px 14px 16px;
  }

  .input-icon {
    right: 16px;
    font-size: 18px;
  }

  .password-toggle {
    right: 16px;
    font-size: 18px;
  }

  .btn {
    padding: 14px 20px;
  }

  .btn-oauth {
    padding: 12px 20px;
    gap: 12px;
  }

  .divider {
    margin: 28px 0 20px;
    gap: 16px;
    font-size: 13px;
  }

  .oauth-buttons {
    gap: 12px;
  }

  .auth-footer {
    margin-top: 28px;
    font-size: 12px;
  }
}

/* =========================================================
   RESPONSIVE - MOBILE
========================================================= */
@media (max-width: 480px) {
  .auth-wrapper {
    padding: 12px;
    align-items: flex-start;
    padding-top: 20px;
  }

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

  .auth-header {
    margin-bottom: 24px;
  }

  .brand-container {
    gap: 10px;
  }

  .brand-logo {
    width: 44px;
    height: 44px;
    border-radius: 11px;
  }

  .brand-title {
    font-size: 22px;
  }

  .tagline {
    font-size: 12px;
  }

  .mode-toggle,
  .auth-tabs {
    margin-bottom: 20px;
  }

  .mode-toggle button,
  .auth-tabs button {
    padding: 9px 6px;
    font-size: 12px;
  }

  .form-group label {
    font-size: 12px;
    margin-bottom: 6px;
  }

  .input-wrapper input {
    padding: 12px 38px 12px 12px;
    font-size: 14px;
  }

  .input-icon {
    right: 12px;
    font-size: 15px;
  }

  .password-toggle {
    right: 12px;
    font-size: 15px;
    padding: 4px;
  }

  .btn {
    padding: 12px 18px;
    font-size: 14px;
  }

  .btn-oauth {
    padding: 10px 14px;
    font-size: 13px;
    gap: 8px;
  }

  .btn-oauth svg {
    width: 18px;
    height: 18px;
  }

  .divider {
    margin: 20px 0 16px;
    gap: 12px;
    font-size: 11px;
  }

  .oauth-buttons {
    gap: 8px;
  }

  .error-message {
    padding: 10px 12px;
    font-size: 12px;
  }

  .auth-footer {
    margin-top: 20px;
    font-size: 10px;
  }

  .admin-badge {
    font-size: 10px;
    padding: 5px 10px;
    margin-bottom: 20px;
  }

  .forgot-password a {
    font-size: 12px;
  }

  .strength-text {
    font-size: 11px;
  }
}

/* =========================================================
   VERY SMALL SCREENS
========================================================= */
@media (max-width: 360px) {
  .auth-card {
    padding: 24px 16px;
  }

  .brand-title {
    font-size: 20px;
  }

  .mode-toggle button,
  .auth-tabs button {
    font-size: 11px;
    padding: 8px 4px;
  }

  .btn-oauth {
    font-size: 12px;
  }
}

/* =========================================================
   LANDSCAPE MOBILE
========================================================= */
@media (max-height: 600px) and (orientation: landscape) {
  .auth-wrapper {
    padding: 16px;
    align-items: flex-start;
  }

  .auth-card {
    margin: 0 auto;
    padding: 24px 28px;
  }

  .auth-header {
    margin-bottom: 20px;
  }

  .mode-toggle,
  .auth-tabs {
    margin-bottom: 18px;
  }

  .auth-form {
    gap: 14px;
  }

  .divider {
    margin: 18px 0 14px;
  }
}

/* =========================================================
   REDUCED MOTION
========================================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* =========================================================
   FOCUS VISIBLE (ACCESSIBILITY)
========================================================= */
button:focus-visible,
input:focus-visible,
a:focus-visible {
  outline: 2px solid var(--primary-500);
  outline-offset: 2px;
}

/* =========================================================
   PRINT STYLES
========================================================= */
@media print {
  .space-background,
  .stars-container,
  .ambient-glow {
    display: none;
  }

  .auth-card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}