/* Premium Login Page Styles - Modern CSS with Advanced Features */

/* CSS Custom Properties for Theme */
:root {
  --bg-primary: #071b49;
  --bg-secondary: #0a2057;
  --bg-card: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  --primary: #1e63ff;
  --primary-hover: color-mix(in oklab, var(--primary) 85%, black);
  --primary-light: color-mix(in oklab, var(--primary) 20%, white);
  --primary-glow: rgba(30, 99, 255, 0.4);
  
  --focus: #2563eb;
  --focus-ring: color-mix(in oklab, var(--focus) 25%, transparent);
  
  --danger: #dc2626;
  --success: #16a34a;
  --warning: #f59e0b;
  
  --border: rgba(2, 6, 23, 0.08);
  --border-hover: rgba(2, 6, 23, 0.16);
  
  --shadow-sm: 0 2px 8px rgba(2, 6, 23, 0.08);
  --shadow-md: 0 10px 30px rgba(2, 6, 23, 0.15);
  --shadow-lg: 0 20px 50px rgba(2, 6, 23, 0.25);
  --shadow-xl: 0 30px 70px rgba(2, 6, 23, 0.35);
  
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  --transition-fast: 160ms;
  --transition-base: 220ms;
  --transition-slow: 360ms;
  
  --ease-out: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Modern Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  height: 100%;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-primary);
  position: relative;
  overflow-x: hidden;
}

/* Background with Gradient and Effects */
.auth-container {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 1.5rem;
  position: relative;
  background: 
    radial-gradient(ellipse 1200px 800px at 50% -20%, 
      color-mix(in oklab, var(--primary) 10%, transparent),
      transparent),
    radial-gradient(ellipse 800px 600px at 80% 120%, 
      rgba(30, 99, 255, 0.05),
      transparent),
    var(--bg-primary);
}

/* Animated Background Orbs */
.bg-effects {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  opacity: 0.3;
  animation: float-orb 20s infinite ease-in-out;
}

.glow-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary), transparent);
  top: -200px;
  left: -200px;
  animation-duration: 25s;
}

.glow-2 {
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, #60a5fa, transparent);
  bottom: -100px;
  right: -100px;
  animation-duration: 30s;
  animation-delay: -5s;
}

.glow-3 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, #818cf8, transparent);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-duration: 35s;
  animation-delay: -10s;
}

@keyframes float-orb {
  0%, 100% {
    transform: translate(0, 0) scale(1);
  }
  33% {
    transform: translate(50px, -50px) scale(1.1);
  }
  66% {
    transform: translate(-30px, 30px) scale(0.9);
  }
}

/* Brand Logo with Effects */
.brand-logo {
  position: relative;
  display: inline-flex;
  margin-bottom: 1.5rem;
  animation: logo-appear 0.6s var(--ease-out) 0.1s both;
  transition: transform var(--transition-base) var(--ease-out);
}

.brand-logo:hover {
  transform: translateY(-3px) scale(1.05);
}

.logo-img {
  width: 64px;
  height: 64px;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.3));
  transition: filter var(--transition-base);
}

.brand-logo:hover .logo-img {
  filter: drop-shadow(0 12px 32px rgba(30, 99, 255, 0.4));
}

.logo-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, var(--primary-glow), transparent);
  border-radius: 50%;
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.brand-logo:hover .logo-glow {
  opacity: 1;
  animation: pulse-glow 2s infinite;
}

@keyframes logo-appear {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes pulse-glow {
  0%, 100% {
    transform: scale(1);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.2);
    opacity: 0.3;
  }
}

/* Authentication Card with Premium Effects */
.auth-card {
  position: relative;
  width: min(440px, 90vw);
  background: var(--bg-card);
  border-radius: var(--radius-xl);
  padding: 2.5rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--border);
  animation: card-appear 0.5s var(--ease-out) 0.2s both;
  transition: all var(--transition-slow) var(--ease-out);
}

.auth-card::before {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, 
    var(--primary-light),
    transparent 40%,
    transparent 60%,
    var(--primary-light));
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
  z-index: -1;
}

.auth-card:hover {
  transform: translateY(-4px) scale(1.01);
  box-shadow: 
    0 40px 80px rgba(2, 6, 23, 0.25),
    0 20px 40px rgba(30, 99, 255, 0.1);
}

.auth-card:hover::before {
  opacity: 1;
}

.card-glow {
  position: absolute;
  inset: -30px;
  background: radial-gradient(ellipse at center,
    var(--primary-glow),
    transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
  border-radius: var(--radius-xl);
  filter: blur(30px);
  z-index: -2;
}

.auth-card:hover .card-glow {
  opacity: 0.5;
  animation: breathe 3s infinite ease-in-out;
}

@keyframes card-appear {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes breathe {
  0%, 100% {
    transform: scale(1);
    opacity: 0.5;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.3;
  }
}

/* Form Styles */
.sign-in-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  text-align: center;
  margin-bottom: 0.5rem;
  animation: fade-in 0.6s var(--ease-out) 0.3s both;
}

@keyframes fade-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Form Groups and Labels */
.form-group {
  position: relative;
  animation: fade-in-up 0.6s var(--ease-out) 0.4s both;
}

.form-group:nth-child(3) {
  animation-delay: 0.5s;
}

.form-group:nth-child(4) {
  animation-delay: 0.6s;
}

@keyframes fade-in-up {
  from {
    opacity: 0;
    transform: translateY(15px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

.form-group:focus-within .form-label {
  color: var(--primary);
}

/* Input Wrapper and Inputs */
.input-wrapper {
  position: relative;
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  padding-right: 2.75rem;
  font-size: 1rem;
  color: var(--text-primary);
  background: var(--bg-card);
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: all var(--transition-fast) var(--ease-out);
}

.form-input:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-sm);
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 
    0 0 0 4px var(--focus-ring),
    var(--shadow-sm);
  transform: translateY(-1px);
}

.form-input:valid:not(:placeholder-shown) {
  border-color: var(--success);
}

.form-input[aria-invalid="true"] {
  border-color: var(--danger);
  animation: shake 0.4s ease-in-out;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

/* Input Icons */
.input-icon {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--transition-fast);
}

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

/* Password Toggle Button */
.toggle-password {
  position: absolute;
  right: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  padding: 0.5rem;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.toggle-password:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.toggle-password:focus {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.toggle-password svg {
  width: 20px;
  height: 20px;
  display: block;
}

.toggle-password .eye-closed {
  display: none;
}

.toggle-password[aria-pressed="true"] .eye-open {
  display: none;
}

.toggle-password[aria-pressed="true"] .eye-closed {
  display: block;
}

/* Caps Lock Warning */
.caps-lock-warning {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  background: color-mix(in oklab, var(--warning) 10%, white);
  color: var(--warning);
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
  animation: slide-down 0.3s var(--ease-out);
}

@keyframes slide-down {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Error Messages */
.error-message,
.field-error {
  color: var(--danger);
  font-size: 0.875rem;
  margin-top: 0.25rem;
  animation: fade-in 0.3s var(--ease-out);
}

.error-message {
  padding: 0.75rem 1rem;
  background: color-mix(in oklab, var(--danger) 10%, white);
  border-radius: var(--radius-sm);
  border: 1px solid color-mix(in oklab, var(--danger) 20%, white);
  margin-bottom: 1rem;
}

/* Form Row */
.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  animation: fade-in-up 0.6s var(--ease-out) 0.7s both;
}

/* Checkbox Styles */
.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  font-size: 0.9375rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.checkbox-label:hover {
  color: var(--text-primary);
}

.checkbox-input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.checkbox-custom {
  position: relative;
  width: 20px;
  height: 20px;
  background: var(--bg-card);
  border: 2px solid var(--border-hover);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast) var(--ease-out);
}

.checkbox-label:hover .checkbox-custom {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.checkbox-input:checked + .checkbox-custom {
  background: var(--primary);
  border-color: var(--primary);
}

.checkbox-input:checked + .checkbox-custom::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 6px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  animation: check-mark 0.3s var(--ease-bounce);
}

@keyframes check-mark {
  from {
    opacity: 0;
    transform: rotate(45deg) scale(0);
  }
  to {
    opacity: 1;
    transform: rotate(45deg) scale(1);
  }
}

/* Links */
.forgot-link,
.signup-link {
  color: var(--primary);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all var(--transition-fast);
  position: relative;
}

.forgot-link::after,
.signup-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition-fast) var(--ease-out);
}

.forgot-link:hover::after,
.signup-link:hover::after {
  width: 100%;
}

/* Primary Button */
.btn-primary {
  position: relative;
  padding: 0.875rem 1.5rem;
  background: var(--primary);
  color: var(--text-inverse);
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  overflow: hidden;
  transition: all var(--transition-fast) var(--ease-out);
  animation: fade-in-up 0.6s var(--ease-out) 0.8s both;
  box-shadow: 
    0 10px 25px rgba(30, 99, 255, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.btn-primary::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    transparent,
    rgba(255, 255, 255, 0.2),
    transparent);
  transform: translateX(-100%);
  transition: transform 0.6s;
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 
    0 15px 35px rgba(30, 99, 255, 0.4),
    inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover::before {
  transform: translateX(100%);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: 
    0 5px 15px rgba(30, 99, 255, 0.3),
    inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.btn-primary:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.btn-primary .btn-loader {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.spinner {
  animation: spin 1s linear infinite;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Divider */
.divider {
  position: relative;
  text-align: center;
  margin: 1.5rem 0;
  animation: fade-in-up 0.6s var(--ease-out) 0.9s both;
}

.divider::before,
.divider::after {
  content: '';
  position: absolute;
  top: 50%;
  width: calc(50% - 60px);
  height: 1px;
  background: var(--border);
}

.divider::before {
  left: 0;
}

.divider::after {
  right: 0;
}

.divider-text {
  display: inline-block;
  padding: 0 1rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  background: var(--bg-card);
}

/* Social Buttons */
.social-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  animation: fade-in-up 0.6s var(--ease-out) 1s both;
}

.btn-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  border: 2px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast) var(--ease-out);
}

.btn-social:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-google:hover {
  border-color: #4285f4;
  background: color-mix(in oklab, #4285f4 10%, white);
  color: #4285f4;
}

.btn-apple:hover {
  border-color: #000000;
  background: color-mix(in oklab, #000000 5%, white);
  color: #000000;
}

.btn-microsoft:hover {
  border-color: #00a4ef;
  background: color-mix(in oklab, #00a4ef 10%, white);
  color: #00a4ef;
}

/* Sign Up Section */
.signup-section {
  text-align: center;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  animation: fade-in-up 0.6s var(--ease-out) 1.1s both;
}

.signup-heading {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.btn-signup {
  display: inline-block;
  padding: 0.75rem 2rem;
  background: transparent;
  color: var(--primary);
  font-size: 1rem;
  font-weight: 600;
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: all var(--transition-fast) var(--ease-out);
  cursor: pointer;
}

.btn-signup:hover {
  background: var(--primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px rgba(30, 99, 255, 0.3);
}

.btn-signup:active {
  transform: translateY(0) scale(0.98);
}

/* Footer */
.auth-footer {
  margin-top: 3rem;
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  animation: fade-in 0.8s var(--ease-out) 1.2s both;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: rgba(147, 197, 253, 0.7); /* Приглушенный голубоватый */
  text-decoration: none;
  font-size: 0.875rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: rgba(147, 197, 253, 1); /* Ярче при наведении */
}

.separator {
  color: rgba(147, 197, 253, 0.4);
}

.footer-copyright {
  font-size: 0.8125rem;
  color: rgba(147, 197, 253, 0.5);
}

/* Responsive Design */
@media (max-width: 640px) {
  .auth-card {
    padding: 2rem;
  }
  
  .form-title {
    font-size: 1.5rem;
  }
  
  .social-buttons {
    grid-template-columns: 1fr;
  }
  
  .btn-social span {
    display: inline;
  }
  
  .form-row {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 0.5rem;
  }
  
  .separator {
    display: none;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .glow-orb {
    animation: none;
    opacity: 0.1;
  }
}

/* Focus Visible for Keyboard Navigation */
:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Print Styles */
@media print {
  .auth-container {
    background: white;
  }
  
  .bg-effects,
  .card-glow,
  .logo-glow {
    display: none;
  }
}