/**
 * XELAS Login Page - Modern Design System
 * Inspired by Linear, Vercel, and Notion
 * Features: Glassmorphism, Gradient Accents, Smooth Animations
 */

/* ==================== */
/* CSS CUSTOM PROPERTIES */
/* ==================== */

:root {
  /* Color Palette */
  --login-bg-primary: #0a0a0a;
  --login-bg-card: rgba(20, 20, 24, 0.85);
  --login-bg-input: rgba(30, 30, 34, 0.6);
  --login-bg-social: rgba(255, 255, 255, 0.06);

  /* Gradient Colors */
  --login-gradient-1: rgba(59, 130, 246, 0.15);
  --login-gradient-2: rgba(139, 92, 246, 0.12);
  --login-gradient-3: rgba(236, 72, 153, 0.1);

  /* Text Colors */
  --login-text-primary: #ffffff;
  --login-text-secondary: #f5f5f5;
  --login-text-body: #a3a3a3;
  --login-text-muted: #737373;
  --login-text-link: #60a5fa;
  --login-text-link-hover: #93c5fd;

  /* Border Colors */
  --login-border-primary: rgba(255, 255, 255, 0.08);
  --login-border-input: rgba(255, 255, 255, 0.1);
  --login-border-focus: #6366f1;
  --login-border-hover: rgba(255, 255, 255, 0.15);

  /* Button Colors */
  --login-btn-gradient-start: #6366f1;
  --login-btn-gradient-end: #8b5cf6;

  /* Spacing */
  --login-card-padding: 3rem;
  --login-gap-xs: 0.5rem;
  --login-gap-sm: 0.75rem;
  --login-gap-md: 1rem;
  --login-gap-lg: 1.5rem;
  --login-gap-xl: 2rem;

  /* Border Radius */
  --login-radius-card: 1.25rem;
  --login-radius-input: 0.75rem;
  --login-radius-button: 0.625rem;

  /* Transitions */
  --login-transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --login-transition-normal: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --login-transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --login-transition-spring: 400ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* Shadows */
  --login-shadow-card:
    0 20px 50px -12px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.08),
    inset 0 1px 0 0 rgba(255, 255, 255, 0.05);
  --login-shadow-focus:
    0 0 0 3px rgba(99, 102, 241, 0.25),
    0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --login-shadow-button-hover:
    0 8px 16px -4px rgba(99, 102, 241, 0.4),
    0 4px 8px -2px rgba(99, 102, 241, 0.2);
}

/* ==================== */
/* BASE STYLES */
/* ==================== */

body,
html {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Visually hidden but accessible to screen readers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==================== */
/* ANIMATED BACKGROUND */
/* ==================== */

.login-page-background {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--login-bg-primary);
  z-index: -1;
  overflow: hidden;
}

.login-page-background::before,
.login-page-background::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.4;
  animation: gradientDrift 20s ease-in-out infinite alternate;
}

.login-page-background::before {
  top: -10%;
  right: -5%;
  width: 600px;
  height: 600px;
  background: radial-gradient(
    circle,
    var(--login-gradient-1) 0%,
    transparent 70%
  );
  animation-delay: 0s;
}

.login-page-background::after {
  bottom: -15%;
  left: -10%;
  width: 700px;
  height: 700px;
  background: radial-gradient(
    circle,
    var(--login-gradient-2) 0%,
    transparent 70%
  );
  animation-delay: -10s;
}

@keyframes gradientDrift {
  0% {
    transform: translate(0, 0) scale(1);
  }
  50% {
    transform: translate(30px, -30px) scale(1.1);
  }
  100% {
    transform: translate(-20px, 20px) scale(0.95);
  }
}

/* ==================== */
/* PAGE CONTAINER */
/* ==================== */

.login-page-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--login-gap-md);
  box-sizing: border-box;
}

/* ==================== */
/* LOGIN CARD */
/* ==================== */

.login-card {
  width: 100%;
  max-width: 440px;
  background: var(--login-bg-card);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--login-border-primary);
  border-radius: var(--login-radius-card);
  padding: var(--login-card-padding);
  box-shadow: var(--login-shadow-card);
  box-sizing: border-box;
  animation: cardEnter var(--login-transition-spring) ease-out;
}

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

/* Fallback for browsers without backdrop-filter support */
@supports not (backdrop-filter: blur(20px)) {
  .login-card {
    background: rgba(20, 20, 24, 0.95);
  }
}

/* ==================== */
/* BRAND HEADER */
/* ==================== */

.login-brand {
  text-align: center;
  margin-bottom: var(--login-gap-sm);
}

.login-brand a {
  text-decoration: none;
  color: inherit;
  display: inline-block;
  transition: opacity 0.2s ease;
}

.login-brand a:hover {
  opacity: 0.8;
}

.brand-logo {
  margin: 0;
  font-size: 2rem;
  font-weight: 700;
  color: var(--login-text-primary);
  letter-spacing: -0.02em;
  background: linear-gradient(
    135deg,
    #ffffff 0%,
    #e0e0e0 100%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-logo-img {
  width: 64px;
  height: 64px;
  object-fit: contain;
}

/* ==================== */
/* PAGE HEADER */
/* ==================== */

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

.login-title {
  margin: 0 0 var(--login-gap-xs) 0;
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--login-text-secondary);
  line-height: 1.2;
}

.login-subtitle {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--login-text-body);
  line-height: 1.5;
}

/* ==================== */
/* FLASH MESSAGES */
/* ==================== */

.flash-messages-container {
  margin-bottom: var(--login-gap-lg);
  display: flex;
  flex-direction: column;
  gap: var(--login-gap-sm);
}

.flash-alert {
  display: flex;
  align-items: flex-start;
  gap: var(--login-gap-sm);
  padding: 0.875rem 1rem;
  border-radius: var(--login-radius-input);
  font-size: 0.875rem;
  line-height: 1.5;
  animation: slideIn var(--login-transition-slow) ease-out;
  position: relative;
}

.flash-alert-danger,
.flash-alert-error {
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: #fca5a5;
}

.flash-alert-success {
  background: rgba(34, 197, 94, 0.1);
  border: 1px solid rgba(34, 197, 94, 0.3);
  color: #86efac;
}

.flash-alert-info {
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.3);
  color: #93c5fd;
}

.flash-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.125rem;
}

.flash-message {
  flex: 1;
  padding-right: var(--login-gap-lg);
}

.flash-close {
  position: absolute;
  top: 50%;
  right: 0.75rem;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: currentColor;
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.7;
  transition: opacity var(--login-transition-fast);
}

.flash-close:hover {
  opacity: 1;
}

.flash-close:focus {
  outline: 2px solid currentColor;
  outline-offset: 2px;
  border-radius: 2px;
}

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

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

/* ==================== */
/* SOCIAL LOGIN SECTION */
/* ==================== */

.social-login-section {
  margin-bottom: var(--login-gap-lg);
}

.social-buttons {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--login-gap-sm);
}

.social-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  background: var(--login-bg-social);
  border: 1px solid var(--login-border-input);
  border-radius: var(--login-radius-button);
  color: var(--login-text-primary);
  text-decoration: none;
  transition: all var(--login-transition-normal);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.social-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.1);
  opacity: 0;
  transition: opacity var(--login-transition-normal);
}

.social-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--login-border-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.social-btn:hover::before {
  opacity: 1;
}

.social-btn:active {
  transform: translateY(0);
  background: rgba(255, 255, 255, 0.08);
}

.social-btn:focus-visible {
  outline: 2px solid var(--login-border-focus);
  outline-offset: 2px;
}

.social-btn img {
  width: 20px;
  height: 20px;
  filter: brightness(0.95);
  transition: filter var(--login-transition-normal);
}

.social-btn:hover img {
  filter: brightness(1.1);
}

/* ==================== */
/* SEPARATOR */
/* ==================== */

.login-separator {
  position: relative;
  text-align: center;
  margin: var(--login-gap-lg) 0;
}

.login-separator span {
  display: inline-block;
  padding: 0 var(--login-gap-md);
  font-size: 0.8125rem;
  color: #525252;
  background: var(--login-bg-card);
  position: relative;
  z-index: 1;
}

.login-separator::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--login-border-primary);
}

/* ==================== */
/* LOGIN FORM */
/* ==================== */

.login-form {
  margin-bottom: var(--login-gap-xl);
}

.form-group {
  margin-bottom: var(--login-gap-md);
  position: relative;
}

.form-group.focused .form-input {
  background: rgba(30, 30, 34, 0.8);
  border-color: var(--login-border-focus);
  box-shadow: var(--login-shadow-focus);
}

.form-label {
  display: block;
  margin-bottom: var(--login-gap-xs);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--login-text-body);
}

.form-input {
  width: 100%;
  height: 48px;
  padding: 0 var(--login-gap-md);
  background: var(--login-bg-input);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--login-border-input);
  border-radius: var(--login-radius-input);
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--login-text-secondary);
  box-sizing: border-box;
  transition: all var(--login-transition-normal);
  outline: none;
}

.form-input::placeholder {
  color: var(--login-text-muted);
  opacity: 1;
}

.form-input:hover:not(:focus) {
  border-color: var(--login-border-hover);
}

.form-input:focus {
  background: rgba(30, 30, 34, 0.8);
  border-color: var(--login-border-focus);
  box-shadow: var(--login-shadow-focus);
}

.form-input.invalid {
  border-color: #ef4444;
  animation: shake 400ms cubic-bezier(0.36, 0.07, 0.19, 0.97);
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  10%, 30%, 50%, 70%, 90% {
    transform: translateX(-4px);
  }
  20%, 40%, 60%, 80% {
    transform: translateX(4px);
  }
}

/* Autofill styling */
.form-input:-webkit-autofill,
.form-input:-webkit-autofill:hover,
.form-input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--login-text-secondary);
  -webkit-box-shadow: 0 0 0 1000px rgba(30, 30, 34, 0.8) inset;
  transition: background-color 5000s ease-in-out 0s;
}

/* ==================== */
/* FORGOT PASSWORD LINK */
/* ==================== */

.forgot-password-link {
  display: block;
  text-align: right;
  margin-top: 8px;
  font-size: 0.85rem;
  color: var(--login-text-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.forgot-password-link:hover {
  color: var(--login-text-secondary);
}

/* ==================== */
/* SUBMIT BUTTON */
/* ==================== */

.submit-btn {
  width: 100%;
  height: 48px;
  padding: 0 var(--login-gap-lg);
  background: rgba(20, 20, 24, 0.9);
  border: 1px solid var(--login-border-input);
  border-radius: var(--login-radius-button);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--login-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--login-gap-xs);
  transition: all var(--login-transition-normal);
  position: relative;
  overflow: hidden;
  box-sizing: border-box;
}

.submit-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.1) 0%,
    rgba(255, 255, 255, 0) 100%
  );
  opacity: 0;
  transition: opacity var(--login-transition-normal);
}

.submit-btn:hover {
  transform: translateY(-2px);
  background: rgba(35, 35, 40, 0.95);
  border-color: var(--login-border-hover);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.submit-btn:hover::before {
  opacity: 1;
}

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

.submit-btn:focus-visible {
  outline: 2px solid rgba(99, 102, 241, 0.5);
  outline-offset: 2px;
}

.submit-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.submit-arrow {
  transition: transform var(--login-transition-normal);
}

.submit-btn:hover .submit-arrow {
  transform: translateX(4px);
}

/* Loading state */
.submit-btn.loading .submit-text {
  opacity: 0.7;
}

.submit-btn.loading .submit-arrow {
  animation: spin 800ms linear infinite;
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* ==================== */
/* FOOTER */
/* ==================== */

.login-footer {
  text-align: center;
}

.legal-text {
  margin: 0 0 var(--login-gap-md) 0;
  font-size: 0.8125rem;
  color: var(--login-text-muted);
  line-height: 1.5;
}

.legal-text a {
  color: var(--login-text-link);
  text-decoration: none;
  transition: color var(--login-transition-fast);
}

.legal-text a:hover {
  color: var(--login-text-link-hover);
  text-decoration: underline;
}

.legal-text a:focus-visible {
  outline: 2px solid var(--login-text-link);
  outline-offset: 2px;
  border-radius: 2px;
}

.register-link-container {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
}

.register-prompt {
  font-size: 0.875rem;
  color: var(--login-text-body);
}

.register-link {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--login-text-link);
  text-decoration: none;
  transition: color var(--login-transition-fast);
}

.register-link:hover {
  color: var(--login-text-link-hover);
  text-decoration: underline;
}

.register-link:focus-visible {
  outline: 2px solid var(--login-text-link);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ==================== */
/* MOBILE RESPONSIVE */
/* ==================== */

@media (max-width: 767px) {
  .login-page-container {
    padding: var(--login-gap-md);
    align-items: flex-start;
    padding-top: var(--login-gap-xl);
  }

  .login-card {
    padding: 2rem 1.5rem;
    border-radius: 1rem;
    animation: cardEnterMobile var(--login-transition-spring) ease-out;
  }

  @keyframes cardEnterMobile {
    0% {
      opacity: 0;
      transform: translateY(10px) scale(0.99);
    }
    100% {
      opacity: 1;
      transform: translateY(0) scale(1);
    }
  }

  .brand-logo {
    font-size: 1.75rem;
  }

  .brand-logo-img {
    width: 56px;
    height: 56px;
  }

  .login-brand {
    margin-bottom: var(--login-gap-sm);
  }

  .login-header {
    margin-bottom: var(--login-gap-lg);
  }

  .login-title {
    font-size: 1.25rem;
  }

  .login-subtitle {
    font-size: 0.875rem;
  }

  /* Larger touch targets for mobile */
  .social-buttons {
    grid-template-columns: repeat(4, 1fr);
    gap: var(--login-gap-sm);
  }

  .social-btn {
    height: 52px;
  }

  .social-btn img {
    width: 22px;
    height: 22px;
  }

  .form-input {
    height: 52px;
    font-size: 16px; /* Prevents iOS zoom on focus */
    padding: 0 1rem;
  }

  .submit-btn {
    height: 52px;
    font-size: 1rem;
  }

  .forgot-password-link {
    font-size: 0.8rem;
    padding: 4px 0;
  }

  .password-strength-container {
    margin-top: 10px;
  }

  .form-hint {
    font-size: 0.75rem;
  }

  /* Background gradient adjustments */
  .login-page-background::before {
    width: 400px;
    height: 400px;
    top: -15%;
    right: -20%;
  }

  .login-page-background::after {
    width: 450px;
    height: 450px;
    bottom: -20%;
    left: -25%;
  }
}

/* Extra small devices */
@media (max-width: 380px) {
  .login-card {
    padding: 1.75rem 1.25rem;
  }

  .brand-logo {
    font-size: 1.5rem;
  }

  .brand-logo-img {
    width: 48px;
    height: 48px;
  }

  .login-title {
    font-size: 1.1rem;
  }

  .login-subtitle {
    font-size: 0.8rem;
  }

  .social-buttons {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--login-gap-sm);
  }

  .social-btn {
    height: 48px;
  }

  .forgot-password-link {
    font-size: 0.75rem;
  }
}

/* Safe area insets for notched devices */
@supports (padding: max(0px)) {
  @media (max-width: 767px) {
    .login-page-container {
      padding-top: max(var(--login-gap-xl), env(safe-area-inset-top));
      padding-bottom: max(var(--login-gap-md), env(safe-area-inset-bottom));
      padding-left: max(var(--login-gap-md), env(safe-area-inset-left));
      padding-right: max(var(--login-gap-md), env(safe-area-inset-right));
    }
  }
}

/* ==================== */
/* REDUCED MOTION */
/* ==================== */

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

  .login-page-background::before,
  .login-page-background::after {
    animation: none;
  }
}

/* ==================== */
/* FOCUS VISIBLE POLYFILL */
/* ==================== */

/* Remove focus styles for mouse users */
:focus:not(:focus-visible) {
  outline: none;
}

/* Enhance focus styles for keyboard users */
:focus-visible {
  outline: 2px solid var(--login-border-focus);
  outline-offset: 2px;
}

/* ==================== */
/* REGISTER PAGE EXTRAS */
/* ==================== */

/* Password Input Wrapper */
.password-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.password-input-wrapper .form-input {
  padding-right: 3rem;
}

.password-toggle {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  padding: 0.5rem;
  cursor: pointer;
  color: var(--login-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--login-transition-fast);
}

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

.password-toggle:focus-visible {
  outline: 2px solid var(--login-border-focus);
  outline-offset: 2px;
  border-radius: 4px;
}

/* Password Strength Indicator */
.password-strength-container {
  display: flex;
  align-items: center;
  gap: var(--login-gap-sm);
  margin-top: var(--login-gap-xs);
}

.password-strength-bar {
  flex: 1;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 2px;
  overflow: hidden;
}

.password-strength-fill {
  height: 100%;
  width: 0;
  border-radius: 2px;
  transition: width var(--login-transition-normal), background-color var(--login-transition-normal);
}

.password-strength-fill.weak {
  background: #ef4444;
}

.password-strength-fill.fair {
  background: #f59e0b;
}

.password-strength-fill.good {
  background: #10b981;
}

.password-strength-fill.strong {
  background: #22c55e;
}

.password-strength-text {
  font-size: 0.75rem;
  font-weight: 500;
  min-width: 3rem;
  text-align: right;
  transition: color var(--login-transition-normal);
}

.password-strength-text.weak {
  color: #ef4444;
}

.password-strength-text.fair {
  color: #f59e0b;
}

.password-strength-text.good {
  color: #10b981;
}

.password-strength-text.strong {
  color: #22c55e;
}

/* Form Hint Text */
.form-hint {
  margin: var(--login-gap-xs) 0 0 0;
  font-size: 0.75rem;
  color: var(--login-text-muted);
  line-height: 1.4;
}

/* Mobile adjustments for register extras */
@media (max-width: 767px) {
  .password-toggle {
    min-width: 44px;
    min-height: 44px;
    padding: 0.5rem;
    right: 0.25rem;
  }

  .password-toggle svg {
    width: 22px;
    height: 22px;
  }

  .password-strength-container {
    margin-top: 0.375rem;
  }

  .password-strength-text {
    font-size: 0.6875rem;
  }

  .form-hint {
    font-size: 0.6875rem;
  }
}

/* ==================== */
/* PRINT STYLES */
/* ==================== */

@media print {
  .login-page-background {
    display: none;
  }

  .login-card {
    box-shadow: none;
    border: 1px solid #333;
  }
}