/* ================================================
   DNHS PORTAL - Responsive Styles
   Optimized for Android, iOS, and Desktop
   ================================================ */

/* ================================================
   CSS CUSTOM PROPERTIES
   ================================================ */
:root {
  /* Colors */
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);
  --secondary-color: #8b5cf6;
  --background-dark: #0f172a;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);
  --border-color: rgba(255, 255, 255, 0.1);
  --input-bg: rgba(255, 255, 255, 0.03);
  
  /* Spacing */
  --touch-target-min: 44px;
  --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
  --safe-area-inset-top: env(safe-area-inset-top, 0px);
  
  /* Transitions */
  --transition-speed: 0.3s;
  --transition-bezier: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Shadows */
  --shadow-sm: 0 4px 15px rgba(99, 102, 241, 0.3);
  --shadow-md: 0 8px 24px rgba(99, 102, 241, 0.15);
  --shadow-lg: 0 10px 30px rgba(99, 102, 241, 0.4);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

/* ================================================
   BASE STYLES
   ================================================ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--background-dark);
  background-image: url('MAIN BG.jpg');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.5;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding: 20px;
}

/* Safe area padding for notched devices */
@supports (padding: max(0px)) {
  body {
    padding-left: max(20px, env(safe-area-inset-left));
    padding-right: max(20px, env(safe-area-inset-right));
    padding-bottom: max(20px, env(safe-area-inset-bottom));
  }
}

/* ================================================
   ANIMATED PARTICLES
   ================================================ */
.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.particle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: rgba(99, 102, 241, 0.3);
  border-radius: 50%;
  animation: float-particle 15s infinite;
}

@keyframes float-particle {
  0%, 100% {
    transform: translateY(100vh) translateX(0) scale(0);
    opacity: 0;
  }
  10% {
    opacity: 1;
    transform: translateY(80vh) translateX(10px) scale(1);
  }
  90% {
    opacity: 1;
  }
  100% {
    transform: translateY(-10vh) translateX(-10px) scale(0.5);
    opacity: 0;
  }
}

/* ================================================
   FADE TRANSITIONS
   ================================================ */
.fade-transition {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--background-dark);
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed) ease;
}

.fade-transition.active {
  opacity: 1;
  pointer-events: all;
}

.fade-out {
  opacity: 0;
  transform: translateY(-10px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}

/* ================================================
   GLASS CARD
   ================================================ */
.glass-card {
  position: relative;
  background: rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.3),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  opacity: 0;
  transform: translateY(30px) scale(0.95);
  animation: card-enter 0.8s var(--transition-bezier) forwards;
  z-index: 10;
}

@keyframes card-enter {
  0% {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ================================================
   LOGO STYLES
   ================================================ */
.logo-container {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 8px;
  opacity: 0;
  transform: translateY(20px);
  animation: logo-enter 0.6s var(--transition-bezier) 0.2s forwards;
}

@keyframes logo-enter {
  0% {
    opacity: 0;
    transform: translateY(20px) scale(0.8);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.logo-float {
  animation: logo-float 3s ease-in-out infinite;
}

@keyframes logo-float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-8px);
  }
}

.logo-container img {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-md);
  object-fit: cover;
}

/* ================================================
   FORM ELEMENTS
   ================================================ */
.form-section {
  opacity: 0;
  transform: translateY(20px);
}

.form-section:nth-child(1) { animation: form-enter 0.5s var(--transition-bezier) 0.4s forwards; }
.form-section:nth-child(2) { animation: form-enter 0.5s var(--transition-bezier) 0.5s forwards; }
.form-section:nth-child(3) { animation: form-enter 0.5s var(--transition-bezier) 0.6s forwards; }
.form-section:nth-child(4) { animation: form-enter 0.5s var(--transition-bezier) 0.7s forwards; }
.form-section:nth-child(5) { animation: form-enter 0.5s var(--transition-bezier) 0.8s forwards; }

@keyframes form-enter {
  0% {
    opacity: 0;
    transform: translateY(20px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Glass Input Group */
.glass-input-group {
  position: relative;
}

.glass-input {
  width: 100%;
  padding: 16px 16px 16px 48px;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition-speed) var(--transition-bezier);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

.glass-input::placeholder {
  color: var(--text-muted);
  transition: all var(--transition-speed) ease;
}

.glass-input:focus {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(99, 102, 241, 0.5);
  box-shadow: 
    0 0 0 4px rgba(99, 102, 241, 0.1),
    var(--shadow-md);
  outline: none;
  transform: translateY(-2px);
}

.glass-input:focus::placeholder {
  opacity: 0.5;
  transform: translateX(5px);
}

/* Remove autofill background */
.glass-input:-webkit-autofill,
.glass-input:-webkit-autofill:hover,
.glass-input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--text-primary);
  -webkit-box-shadow: 0 0 0px 1000px var(--background-dark) inset;
  transition: background-color 5000s ease-in-out 0s;
}

/* Input Icon */
.input-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 14px;
  transition: all var(--transition-speed) ease;
  pointer-events: none;
}

.glass-input:focus + .input-icon {
  color: var(--primary-color);
  transform: translateY(-50%) scale(1.1);
}

/* Password Toggle */
.password-toggle {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  background: none;
  border: none;
  padding: 8px;
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
}

.password-toggle:hover {
  color: var(--text-primary);
  transform: translateY(-50%) scale(1.1);
}

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

/* ================================================
   CUSTOM CHECKBOX
   ================================================ */
.custom-checkbox {
  position: relative;
  width: 20px;
  height: 20px;
  cursor: pointer;
  flex-shrink: 0;
}

.custom-checkbox input {
  position: absolute;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.custom-checkbox .checkmark {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 6px;
  transition: all var(--transition-speed) ease;
}

.custom-checkbox input:checked ~ .checkmark {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  border-color: transparent;
  transform: scale(1.1);
}

.custom-checkbox .checkmark:after {
  content: '';
  position: absolute;
  left: 7px;
  top: 3px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) scale(0);
  transition: all 0.2s ease;
}

.custom-checkbox input:checked ~ .checkmark:after {
  transform: rotate(45deg) scale(1);
}

.custom-checkbox input:focus ~ .checkmark {
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* ================================================
   BUTTONS
   ================================================ */
.btn-primary {
  position: relative;
  width: 100%;
  padding: 16px 24px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 50%, #a855f7 100%);
  background-size: 200% 200%;
  border: none;
  border-radius: var(--radius-lg);
  color: white;
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  overflow: hidden;
  transition: all 0.4s var(--transition-bezier);
  box-shadow: var(--shadow-sm);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-primary::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.btn-primary:hover::before {
  left: 100%;
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg), 0 0 20px rgba(139, 92, 246, 0.3);
  background-position: 100% 0;
}

.btn-primary:active {
  transform: translateY(-1px) scale(0.98);
  box-shadow: var(--shadow-sm);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-primary.loading {
  pointer-events: none;
  opacity: 0.8;
}

/* ================================================
   LINKS
   ================================================ */
.link-hover {
  position: relative;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition-speed) ease;
}

.link-hover::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  transition: width var(--transition-speed) ease;
}

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

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

/* Register Link */
.register-link {
  color: var(--text-muted);
  font-size: 14px;
  transition: all 0.4s var(--transition-bezier);
}

.register-link .create-account {
  position: relative;
  color: var(--primary-color);
  font-weight: 600;
  text-decoration: none;
  transition: all 0.4s var(--transition-bezier);
}

.register-link .create-account::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color), #a78bfa);
  transform: translateX(-50%);
  transition: width 0.4s var(--transition-bezier);
  border-radius: 2px;
}

.register-link:hover .create-account {
  color: #818cf8;
  transform: translateY(-2px);
  text-shadow: 0 0 20px rgba(99, 102, 241, 0.5);
}

.register-link:hover .create-account::before {
  width: 100%;
}

/* ================================================
   SOCIAL ICONS
   ================================================ */
.follow-label {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
  transition: color var(--transition-speed) ease;
}

.social-icon-btn {
  position: relative;
  width: 48px;
  height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  color: rgba(255, 255, 255, 0.6);
  font-size: 18px;
  text-decoration: none;
  cursor: pointer;
  overflow: hidden;
  transition: all 0.4s var(--transition-bezier);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.social-icon-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, #4267B2, #5b7bc0);
  opacity: 0;
  transition: opacity var(--transition-speed) ease;
}

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

.social-icon-btn i {
  position: relative;
  z-index: 1;
  transition: transform 0.4s var(--transition-bezier);
}

.social-icon-btn:hover i {
  transform: scale(1.15) rotate(5deg);
}

.social-icon-btn:hover {
  border-color: transparent;
  box-shadow: 
    0 0 20px rgba(66, 103, 178, 0.5),
    0 0 40px rgba(66, 103, 178, 0.3);
  transform: translateY(-4px);
}

.social-icon-btn:active {
  transform: translateY(-2px) scale(0.98);
}

/* Glow ring effect */
.social-icon-btn::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  background: linear-gradient(135deg, #4267B2, transparent, #5b7bc0);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-speed) ease;
}

.social-icon-btn:hover::after {
  opacity: 0.6;
  animation: rotate 3s linear infinite;
}

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

/* ================================================
   TITLE ANIMATIONS
   ================================================ */
h1 {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.title-enter {
  opacity: 0;
  transform: translateY(10px);
  animation: title-enter 0.6s var(--transition-bezier) 0.35s forwards;
}

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

.subtitle-enter {
  opacity: 0;
  font-size: clamp(0.875rem, 2vw, 1rem);
  animation: subtitle-enter 0.5s var(--transition-bezier) 0.5s forwards;
}

@keyframes subtitle-enter {
  0% {
    opacity: 0;
    transform: translateY(5px);
  }
  100% {
    opacity: 0.7;
    transform: translateY(0);
  }
}

/* ================================================
   RESPONSIVE DESIGN - MOBILE FIRST
   ================================================ */

/* Extra Small Devices (phones, 320px - 480px) */
@media (max-width: 480px) {
  body {
    padding: 10px;
    padding-top: max(10px, var(--safe-area-inset-top));
    padding-bottom: max(10px, var(--safe-area-inset-bottom));
  }

  .glass-card {
    padding: 20px !important;
    border-radius: var(--radius-lg);
    margin: 10px;
  }

  .logo-container {
    padding: 6px;
  }

  .logo-container img {
    width: 60px !important;
    height: 60px !important;
  }

  h1 {
    font-size: 1.5rem !important;
  }

  .glass-input {
    padding: 14px 14px 14px 44px;
    font-size: 14px;
  }

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

  .password-toggle {
    right: 12px;
  }

  .btn-primary {
    padding: 14px 20px;
    font-size: 13px;
  }

  .social-icon-btn {
    width: 44px;
    height: 44px;
    font-size: 16px;
  }

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

  /* Touch improvements */
  .glass-input {
    min-height: 52px;
  }

  .password-toggle {
    min-width: 52px;
    min-height: 52px;
  }
}

/* Small Tablets (481px - 768px) */
@media (min-width: 481px) and (max-width: 768px) {
  body {
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .glass-card {
    padding: 30px !important;
    max-width: 450px;
    margin: 20px auto;
  }

  .logo-container img {
    width: 80px !important;
    height: 80px !important;
  }

  h1 {
    font-size: 1.75rem !important;
  }
}

/* Tablets and Small Desktops (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
  body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 40px;
  }

  .glass-card {
    max-width: 480px;
    width: 100%;
    padding: 40px !important;
    margin: 0 auto;
  }
}

/* Desktop (1025px and up) */
@media (min-width: 1025px) {
  body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 40px;
  }

  .glass-card {
    max-width: 420px;
    width: 100%;
    margin: 0 auto;
    box-shadow: 
      0 8px 32px rgba(0, 0, 0, 0.3),
      inset 0 1px 0 rgba(255, 255, 255, 0.05),
      0 0 60px rgba(99, 102, 241, 0.1);
    transition: all 0.4s var(--transition-bezier);
  }

  .glass-card:hover {
    transform: translateY(-5px);
    box-shadow: 
      0 20px 50px rgba(0, 0, 0, 0.4),
      inset 0 1px 0 rgba(255, 255, 255, 0.05),
      0 0 80px rgba(99, 102, 241, 0.15);
  }

  .glass-input:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
  }

  /* Larger screens */
  @media (min-width: 1440px) {
    .glass-card {
      max-width: 480px;
    }
  }
}

/* ================================================
   TOUCH DEVICE OPTIMIZATIONS
   ================================================ */
@media (hover: none) and (pointer: coarse) {
  /* Disable hover effects on touch devices */
  .btn-primary:hover::before {
    display: none;
  }

  .btn-primary:hover {
    transform: none;
    box-shadow: var(--shadow-sm);
  }

  /* Ensure touch targets are large enough */
  .glass-input {
    min-height: 52px;
  }

  .btn-primary {
    padding: 18px 24px;
  }

  .social-icon-btn {
    width: 52px;
    height: 52px;
  }

  /* Remove tap highlight */
  * {
    -webkit-tap-highlight-color: transparent;
  }

  /* Improve touch response */
  .btn-primary,
  .social-icon-btn,
  .link-hover {
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
  }
}

/* ================================================
   iOS SPECIFIC OPTIMIZATIONS
   ================================================ */
@supports (-webkit-touch-callout: none) {
  body {
    /* Fix for iOS input zoom */
    font-size: 16px;
  }

  .glass-input {
    font-size: 16px;
    /* Prevent iOS autofill styling */
    -webkit-appearance: none;
    appearance: none;
  }
}

.ios .glass-card {
  /* iOS safe area handling */
  padding-bottom: calc(20px + var(--safe-area-inset-bottom));
}

/* ================================================
   ANDROID SPECIFIC OPTIMIZATIONS
   ================================================ */
.android body {
  /* Android specific optimizations */
  -webkit-font-smoothing: none;
}

.android .glass-input:focus {
  /* Remove Android focus ring */
  -webkit-tap-highlight-color: transparent;
}

/* ================================================
   ACCESSIBILITY
   ================================================ */

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Skip link for screen readers */
.skip-link {
  position: absolute;
  top: -100%;
  left: 50%;
  transform: translateX(-50%);
  padding: 1rem 2rem;
  background: var(--primary-color);
  color: white;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  z-index: 10000;
  transition: top var(--transition-speed) ease;
}

.skip-link:focus {
  top: 0;
}

/* Back link styling */
.back-link {
  position: relative;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition-speed) ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.back-link::before {
  content: '←';
  position: absolute;
  left: -20px;
  opacity: 0;
  transition: all var(--transition-speed) ease;
}

.back-link:hover {
  color: var(--primary-color);
  padding-left: 20px;
}

.back-link:hover::before {
  opacity: 1;
  left: 0;
}

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

  .logo-float {
    animation: none;
  }

  .particle {
    animation: none;
    opacity: 0.3;
  }
}

/* High contrast mode */
@media (prefers-contrast: high) {
  .glass-card {
    background: rgba(0, 0, 0, 0.9);
    border: 2px solid white;
  }

  .glass-input {
    background: black;
    border: 2px solid white;
  }

  .btn-primary {
    border: 2px solid white;
  }
}

/* ================================================
   PERFORMANCE OPTIMIZATIONS
   ================================================ */

/* Will-change for animations */
.glass-card {
  will-change: opacity, transform;
}

.btn-primary {
  will-change: transform, box-shadow;
}

.glass-input {
  will-change: background-color, border-color, box-shadow, transform;
}

/* GPU acceleration for animations */
.logo-float,
.btn-primary,
.social-icon-btn {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* ================================================
   DARK MODE SUPPORT
   ================================================ */
@media (prefers-color-scheme: dark) {
  /* Already optimized for dark mode, no changes needed */
}

/* Force light mode override */
@media (prefers-color-scheme: light) {
  body {
    background-color: #1e1e2e;
  }
}