/* Envelope Component Styles for Wedding Site
 * Story 13.1: Create Seamless Envelope Experience
 * Designed for 320px × 240px desktop, responsive scaling
 */

/* CSS Custom Properties for Envelope Design */
:root {
  --envelope-cream: #F9F7F4;
  --envelope-gold: #D4AF37;
  --envelope-seal-color: #8B4513;
  --envelope-shadow: rgba(0, 0, 0, 0.15);
  --envelope-glow: rgba(212, 175, 55, 0.4);
  --envelope-text-color: #2C3E50;
}

/* Envelope Container */
.envelope-container {
  position: relative;
  width: 70%; /* 70% width for desktop */
  max-width: 700px;
  margin: 0 auto;
  aspect-ratio: 3/2; /* Real envelope proportions - wider than tall */
  
  /* Phase 4: Move perspective to container for better cross-browser support */
  perspective: 1200px;
  -webkit-perspective: 1200px;
  -moz-perspective: 1200px;
  perspective-origin: 50% 50%;
  -webkit-perspective-origin: 50% 50%;
  -moz-perspective-origin: 50% 50%;
  /* CRITICAL: Enable 3D context for child transforms */
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
}

/* Fixed Position Envelope Container (for invitation page) */
.envelope-container.fixed-position {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 1000;
  margin: 0; /* Remove auto margin for fixed positioning */
  pointer-events: none; /* Allow clicks to pass through after animation */
}

/* Re-enable pointer events only when envelope is interactive */
.envelope-container.fixed-position.interactive {
  pointer-events: auto;
}

/* Hide envelope completely after animation */
.envelope-container.fixed-position.completed {
  display: none !important;
  pointer-events: none !important;
}

/* Main Envelope Body */
.envelope {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--envelope-cream) 0%, #F5F3F0 100%);
  border: 3px solid var(--envelope-gold);
  border-radius: 0; /* Sharp corners like real envelopes */
  box-shadow: 
    0 8px 25px var(--envelope-shadow),
    inset 0 1px 0 rgba(255,255,255,0.3); /* Inner highlight for depth */
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  -moz-transform-style: preserve-3d;
  overflow: visible; /* Allow flap to show outside */
  /* Phase 4: Perspective moved to container for better browser support */
}

/* Envelope Interactive States */
.envelope:hover:not(.opening):not(.envelope--seal-activating):not(.envelope--opening) {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 12px 35px var(--envelope-shadow), 0 0 20px var(--envelope-glow);
}

.envelope.active:not(.opening):not(.envelope--seal-activating):not(.envelope--opening) {
  transform: translateY(-4px) scale(1.05);
  box-shadow: 0 15px 40px var(--envelope-shadow), 0 0 25px var(--envelope-glow);
}

/* Event-Driven Animation States (Phase 1 & 2) */

/* Seal Activation State */
.envelope--seal-activating {
  transform: translateY(-2px) scale(1.03);
  box-shadow: 0 15px 40px var(--envelope-shadow), 0 0 30px var(--envelope-glow);
  transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

.envelope--seal-activating .envelope-seal {
  animation: seal-intense-glow 0.8s ease-out forwards;
  transform: scale(1.1);
}

/* Guest Name Revealing State */
.envelope--revealing .envelope-guest-name {
  animation: name-reveal-smooth 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

/* Envelope Opening State */
.envelope--opening {
  transform: none !important;
  transition: none !important;
}

.envelope--opening .envelope-flap-wrapper {
  transform: rotateX(105deg) !important; /* Fold back but stay visibly attached to envelope */
  transition: transform 1.2s cubic-bezier(0.25, 0.1, 0.25, 1);
}

.envelope--opening .envelope-flap {
  /* Enhanced shadow for opened state - more dramatic depth */
  box-shadow: 
    0 0 0 3px var(--envelope-gold), /* Maintain gold border */
    0 8px 24px rgba(0,0,0,0.3), /* Strong shadow for folded state */
    0 12px 32px rgba(0,0,0,0.2), /* Additional depth */
    inset 0 2px 6px rgba(0,0,0,0.15), /* Inner shadow for realism */
    inset 0 1px 0 rgba(255,255,255,0.1); /* Subtle inner highlight */
  /* Maintain color continuity - darker but still cream-based */
  background: linear-gradient(145deg, 
    #EAE8E5 0%, 
    #E0DDD8 50%, 
    #D8D5D0 100%);
}

/* Legacy .envelope.opening state removed - now using .envelope--opening exclusively */

.envelope.loading {
  animation: envelope-pulse 1.5s ease-in-out infinite;
}

/* Envelope Flap Wrapper */
.envelope-flap-wrapper {
  position: absolute;
  top: -3px; /* Align with envelope border for seamless integration */
  left: -3px; /* Match envelope border width */
  right: -3px; /* Match envelope border width */
  height: 62%; /* Longer flap for realistic proportions */
  transform-origin: 50% 2px; /* Rotate from the top edge attachment point */
  transform-style: preserve-3d;
  transition: transform 1.2s cubic-bezier(0.25, 0.1, 0.25, 1);
  z-index: 5; /* Above interior (z-index: 1) */
}

/* Envelope Flap */
.envelope-flap {
  width: 100%;
  height: 100%;
  /* More realistic flap color - cream interior with subtle gray undertone */
  background: linear-gradient(to bottom, 
    var(--envelope-cream) 0%, 
    #F4F2EF 50%, 
    #F0F0F0 100%);
  /* Improved clip-path that accounts for border integration */
  clip-path: polygon(0% 0%, 100% 0%, 50% 98%);
  /* Enhanced shadow for realistic depth and attachment */
  box-shadow: 
    0 0 0 3px var(--envelope-gold), /* Gold border matching envelope */
    0 2px 8px rgba(0,0,0,0.15), /* Subtle base shadow */
    0 6px 16px rgba(0,0,0,0.1), /* Larger shadow for depth */
    inset 0 1px 0 rgba(255,255,255,0.2); /* Inner highlight for realism */
}

/* Legacy .envelope.opening styles removed to prevent duplicate rotation
   Modern code now uses .envelope--opening exclusively */

/* Envelope dissolution animation */
.envelope.dissolving {
  animation: envelope-dissolve 1s ease-in-out forwards;
}

@keyframes envelope-dissolve {
  0% {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  50% {
    opacity: 0.7;
    transform: translateY(-10px) scale(1.02);
  }
  100% {
    opacity: 0;
    transform: translateY(-20px) scale(1.05);
    pointer-events: none;
  }
}

/* Envelope Seal */
.envelope-seal {
  position: absolute;
  top: 42%;
  left: 50%;
  transform: translateX(-50%);
  width: 45px;
  height: 45px;
  background: 
    radial-gradient(circle at 30% 30%, var(--envelope-gold) 0%, var(--envelope-seal-color) 70%),
    radial-gradient(circle at 70% 70%, rgba(139,69,19,0.3) 0%, transparent 50%);
  border-radius: 50%;
  border: 3px solid var(--envelope-seal-color);
  z-index: 15; /* Above flap */
  transition: all 0.4s ease;
  box-shadow: 
    0 3px 8px rgba(0,0,0,0.2),
    inset 0 1px 2px rgba(255,255,255,0.3);
}

.envelope-seal::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--envelope-cream);
  font-size: 18px;
  font-weight: bold;
}

.envelope.active .envelope-seal {
  animation: seal-glow 2s ease-in-out infinite;
}

/* Envelope Interior (for polaroid emergence in 13.3) */
.envelope-interior {
  position: absolute;
  top: 2%;
  left: 0.5%;
  right: 0.5%;
  height: 55%; /* Slightly smaller than flap height (60%) */
  background: 
    linear-gradient(to bottom, #F8F8F8 0%, #F0F0F0 100%); /* Slightly darker to be visible */
  border: 1px solid rgba(212, 175, 55, 0.3); /* Subtle border for definition */
  opacity: 0; /* Initially hidden, revealed when envelope opens */
  visibility: hidden;
  transition: opacity 0.6s ease-out, visibility 0.6s ease-out;
  z-index: 1; /* Behind flap but above envelope body */
  clip-path: polygon(0.5% 0%, 99.5% 0%, 50% 90%); /* Triangle 99% width of envelope */
  box-shadow: 
    inset 0 0 25px rgba(0,0,0,0.15), /* Deep cavity shadow */
    inset 0 8px 15px rgba(0,0,0,0.1), /* Top edge shadow */
    inset 4px 0 8px rgba(0,0,0,0.05), /* Left wall shadow */
    inset -4px 0 8px rgba(0,0,0,0.05), /* Right wall shadow */
    inset 0 -4px 8px rgba(0,0,0,0.03); /* Bottom shadow */
}

/* Add interior side walls for depth */
.envelope-interior::before,
.envelope-interior::after {
  content: '';
  position: absolute;
  background: linear-gradient(135deg, #F8F8F8 0%, #F0F0F0 100%);
}

/* Left interior wall */
.envelope-interior::before {
  top: 0;
  left: -3px;
  width: 3px;
  height: 100%;
  transform: skewY(-5deg);
  box-shadow: inset 1px 0 3px rgba(0,0,0,0.2);
}

/* Right interior wall */
.envelope-interior::after {
  top: 0;
  right: -3px;
  width: 3px;
  height: 100%;
  transform: skewY(5deg);
  box-shadow: inset -1px 0 3px rgba(0,0,0,0.2);
}

/* Add folded corner details for realism */

.envelope-interior:hover::before {
  box-shadow: 
    inset 1px 0 3px rgba(0,0,0,0.2),
    inset 0 1px 2px rgba(0,0,0,0.1); /* Corner fold shadow */
}

.envelope-interior:hover::after {
  box-shadow: 
    inset -1px 0 3px rgba(0,0,0,0.2),
    inset 0 1px 2px rgba(0,0,0,0.1); /* Corner fold shadow */
}

/* Interior is always visible - no special animation needed */

/* Ensure wedding content appears above interior cavity */
#header-section,
#venue-section, 
#schedule-section,
#rsvp-section,
#faq-section,
.invitation-content {
  position: relative;
  z-index: 10; /* Above interior cavity */
}


/* Wedding Title on Envelope */
.envelope-wedding-title {
  position: absolute;
  bottom: 15px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Dancing Script', cursive;
  font-size: 0.8rem;
  color: var(--envelope-seal-color);
  text-align: center;
  font-weight: 500;
  z-index: 3;
  white-space: nowrap;
}

/* Email Input Overlay */
.envelope-email-overlay {
  position: absolute;
  top: 75%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 85%;
  opacity: 1;
  visibility: visible;
  transition: all 0.3s ease;
  z-index: 4;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.envelope-email-input {
  width: 100%;
  padding: 8px 12px;
  border: 2px solid var(--envelope-gold);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--envelope-text-color);
  font-size: 14px;
  text-align: center;
  outline: none;
  backdrop-filter: blur(2px);
}

.envelope-email-input::placeholder {
  color: #888;
  font-style: italic;
}

.envelope-email-input:focus {
  border-color: var(--envelope-seal-color);
  box-shadow: 0 0 10px var(--envelope-glow);
}

/* Guest Name Display */
.envelope-guest-name {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Playfair Display', serif;
  font-size: 1.2rem;
  color: var(--envelope-seal-color);
  text-align: center;
  opacity: 0;
  z-index: 4;
}

.envelope-guest-name.reveal {
  animation: name-typewriter 1.5s ease-out forwards;
}

/* Submit Button */
.envelope-submit-btn {
  padding: 8px 20px;
  background: var(--envelope-gold);
  color: white;
  border: none;
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  opacity: 1;
  visibility: visible;
  transition: all 0.3s ease;
  z-index: 4;
  align-self: center;
  width: fit-content;
}

.envelope-submit-btn:hover {
  background: var(--envelope-seal-color);
  transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
  .envelope-container {
    width: 90%; /* 90% width for mobile to fill more of page */
    max-width: 550px;
    margin: 0 auto;
    aspect-ratio: 2.8/2; /* Slightly less wide on mobile */
  }
  
  .envelope-flap-wrapper {
    height: 55%; /* Slightly shorter flap on mobile */
  }
  
  .envelope-wedding-title {
    font-size: 0.7rem;
    bottom: 12px;
  }
  
  .envelope-guest-name {
    font-size: 1rem;
    bottom: 15px;
  }
  
  .envelope-seal {
    width: 35px;
    height: 35px;
  }
  
  .envelope-seal::before {
    font-size: 16px;
  }
  
  .envelope-email-input {
    font-size: 13px;
    padding: 6px 10px;
  }
  
  .envelope-submit-btn {
    font-size: 11px;
    padding: 5px 14px;
  }
}

@media (max-width: 480px) {
  .envelope-container {
    width: 95%; /* 95% width for smallest mobile screens */
    max-width: 450px;
    aspect-ratio: 2.5/2; /* More square on very small screens */
  }
  
  .envelope-flap-wrapper {
    height: 50%; /* Even shorter flap on very small screens */
  }
  
  .envelope-wedding-title {
    font-size: 0.6rem;
    bottom: 10px;
  }
  
  .envelope-guest-name {
    font-size: 0.9rem;
  }
  
  .envelope-seal {
    width: 35px;
    height: 35px;
    top: 40%;
  }
  
  .envelope-seal::before {
    font-size: 14px;
  }
}

/* Animations */
@keyframes envelope-pulse {
  0%, 100% {
    box-shadow: 0 8px 25px var(--envelope-shadow);
  }
  50% {
    box-shadow: 0 8px 25px var(--envelope-shadow), 0 0 20px var(--envelope-glow);
  }
}

/* Event-Driven Animation Keyframes (Phase 2) */
@keyframes seal-intense-glow {
  0% {
    box-shadow: 0 3px 8px rgba(0,0,0,0.2), inset 0 1px 2px rgba(255,255,255,0.3);
    transform: scale(1);
  }
  50% {
    box-shadow: 
      0 6px 16px rgba(0,0,0,0.3),
      0 0 30px var(--envelope-glow),
      0 0 50px var(--envelope-glow),
      inset 0 1px 2px rgba(255,255,255,0.5);
    transform: scale(1.15);
  }
  100% {
    box-shadow: 
      0 4px 12px rgba(0,0,0,0.25),
      0 0 20px var(--envelope-glow),
      inset 0 1px 2px rgba(255,255,255,0.4);
    transform: scale(1.1);
  }
}

@keyframes name-reveal-smooth {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(15px) scale(0.9);
  }
  30% {
    opacity: 0.3;
    transform: translateX(-50%) translateY(8px) scale(0.95);
  }
  70% {
    opacity: 0.9;
    transform: translateX(-50%) translateY(2px) scale(1.02);
  }
  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(0px) scale(1);
  }
}

@keyframes seal-glow {
  0%, 100% {
    box-shadow: 0 0 10px var(--envelope-glow);
  }
  50% {
    box-shadow: 0 0 20px var(--envelope-glow), 0 0 30px var(--envelope-glow);
  }
}

@keyframes name-typewriter {
  0% {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
  20% {
    opacity: 1;
  }
  100% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* Loading States */
.envelope-loading-text {
  position: absolute;
  top: 60%;
  left: 50%;
  transform: translateX(-50%);
  font-size: 12px;
  color: var(--envelope-text-color);
  opacity: 0;
  z-index: 4;
}

.envelope.loading .envelope-loading-text {
  opacity: 1;
  animation: fade-in-out 2s ease-in-out infinite;
}

@keyframes fade-in-out {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 1; }
}

/* Accessibility and Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .envelope,
  .envelope-flap-wrapper,
  .envelope-flap,
  .envelope-seal,
  .envelope-guest-name,
  .envelope-submit-btn {
    animation: none !important;
    transition: none !important;
  }
  
  .envelope:hover {
    transform: none;
  }
}

/* Focus states for keyboard navigation */
.envelope:focus-visible {
  outline: 3px solid var(--envelope-gold);
  outline-offset: 4px;
}

.envelope-email-input:focus-visible {
  outline: 2px solid var(--envelope-seal-color);
  outline-offset: 2px;
}

.envelope-submit-btn:focus-visible {
  outline: 2px solid white;
  outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .envelope {
    border-width: 3px;
    border-color: #000;
  }
  
  .envelope-seal {
    border-width: 2px;
    border-color: #000;
  }
  
  .envelope-email-input {
    border-width: 2px;
    border-color: #000;
  }
}

/* Screen reader only content */
.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;
}

/* Ensure text remains visible during font swap */
.envelope-guest-name {
  font-display: swap;
}

/* Improve touch targets for mobile */
@media (hover: none) and (pointer: coarse) {
  .envelope {
    min-height: 48px;
    min-width: 48px;
  }
  
  .envelope-submit-btn {
    min-height: 44px;
    min-width: 44px;
    padding: 8px 20px;
  }
  
  .envelope-email-input {
    min-height: 44px;
    padding: 12px 16px;
    font-size: 16px; /* Prevents zoom on iOS */
  }
}