/* ==========================================================================
   Teacher's Day Love Letter - QR Code Streamlined Experience
   Aesthetic: Romantic Vintage Stationery, Polaroid Photo Keepsakes & Warm Elegance
   ========================================================================== */

:root {
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-script: 'Great Vibes', cursive;
  --font-handwriting: 'Caveat', 'Alex Brush', cursive;
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --color-bg-base: #f8f3ea;
  --color-parchment: #fffdf8;
  --color-parchment-border: #e6dac6;
  --color-ink: #2b211b;
  --color-ink-muted: #5e5048;
  --color-ink-light: #8c7c72;
  --color-crimson: #8c1d31;
  --color-crimson-dark: #661221;
  --color-gold: #c59b48;
  --color-gold-light: #e8c97e;
  --color-gold-dark: #966f27;
  --color-blush: #fcedec;
  --color-rose: #d9777f;

  --envelope-body: #eadecd;
  --envelope-flap: #dfd0be;

  --shadow-subtle: 0 4px 15px rgba(43, 33, 27, 0.06);
  --shadow-medium: 0 10px 30px rgba(43, 33, 27, 0.12);
  --shadow-dramatic: 0 20px 50px rgba(43, 33, 27, 0.22);
  --shadow-letter: 0 25px 60px rgba(70, 48, 35, 0.18), 0 5px 15px rgba(70, 48, 35, 0.08);

  --transition-smooth: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-bounce: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-serif);
  color: var(--color-ink);
  background: var(--color-bg-base);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
  position: relative;
  background-image: 
    radial-gradient(ellipse at 15% 15%, rgba(252, 237, 236, 0.8) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 75%, rgba(232, 201, 126, 0.35) 0%, transparent 60%),
    radial-gradient(ellipse at 50% 100%, rgba(223, 208, 190, 0.4) 0%, transparent 50%);
  background-attachment: fixed;
}

/* Falling Rose Petals & Golden Sparkles Canvas */
#ambient-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 15;
}

/* Discreet Floating Sound Indicator (No menu clutter) */
.sound-fab {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 100;
  background: rgba(255, 253, 248, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--color-parchment-border);
  border-radius: 30px;
  padding: 8px 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-smooth);
}

.sound-fab:hover {
  transform: scale(1.05);
  background: rgba(255, 253, 248, 0.98);
  border-color: var(--color-gold);
}

.sound-label {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
  color: var(--color-crimson);
  text-transform: uppercase;
}

.sound-bars {
  display: inline-flex;
  align-items: flex-end;
  gap: 2.5px;
  height: 14px;
}

.sound-bars span {
  width: 2.5px;
  background: var(--color-crimson);
  border-radius: 2px;
  animation: soundPulse 0.9s ease-in-out infinite alternate;
}

.sound-bars span:nth-child(1) { height: 6px; animation-delay: 0.1s; }
.sound-bars span:nth-child(2) { height: 14px; animation-delay: 0.35s; }
.sound-bars span:nth-child(3) { height: 9px; animation-delay: 0.2s; }
.sound-bars span:nth-child(4) { height: 12px; animation-delay: 0.4s; }

.sound-fab.muted .sound-bars span {
  animation-play-state: paused;
  height: 3px !important;
  opacity: 0.4;
}

.sound-fab.muted .sound-label {
  color: var(--color-ink-muted);
}

@keyframes soundPulse {
  0% { height: 3px; }
  100% { height: 14px; }
}

/* Page Container */
.page-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 30px 16px 70px;
  position: relative;
  z-index: 20;
}

/* ==========================================================================
   ENVELOPE SCREEN (Stage 1)
   ========================================================================== */
.envelope-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
  max-width: 600px;
  margin: auto;
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.envelope-screen.opened {
  opacity: 0;
  transform: scale(0.9) translateY(-40px);
  pointer-events: none;
  position: absolute;
}

.envelope-intro-text {
  text-align: center;
  margin-bottom: 22px;
  animation: fadeInDown 1.2s ease;
  padding: 0 10px;
}

.intro-tagline {
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  font-size: 0.78rem;
  color: var(--color-gold-dark);
  font-weight: 600;
  margin-bottom: 6px;
}

.intro-title {
  font-family: var(--font-script);
  font-size: 2.75rem;
  color: var(--color-crimson);
  line-height: 1.15;
}

.intro-hint {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-ink-muted);
  margin-top: 6px;
}

/* 3D Envelope */
.envelope-wrapper {
  position: relative;
  width: 100%;
  max-width: 560px;
  height: 370px;
  perspective: 1200px;
  margin: 10px 0 20px;
  animation: floatEnvelope 4s ease-in-out infinite;
}

@keyframes floatEnvelope {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

.envelope {
  position: relative;
  width: 100%;
  height: 100%;
  background: var(--envelope-body);
  border-radius: 12px;
  box-shadow: var(--shadow-dramatic);
  overflow: visible;
  border: 1px solid rgba(197, 155, 72, 0.35);
}

.envelope::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(0,0,0,0.035) 1px, transparent 0);
  background-size: 10px 10px;
  border-radius: 12px;
  pointer-events: none;
}

/* Postage Stamp */
.envelope-stamp {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 95px;
  height: 95px;
  background: #fff;
  padding: 3px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
  border-radius: 2px;
  transform: rotate(3deg);
  transition: transform 0.3s ease;
  z-index: 6;
}

.envelope-stamp img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Postmark overlay */
.postmark-overlay {
  position: absolute;
  top: 30px;
  right: 108px;
  width: 78px;
  height: 78px;
  border: 2px dashed rgba(140, 29, 49, 0.45);
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.52rem;
  font-weight: 700;
  color: rgba(140, 29, 49, 0.55);
  letter-spacing: 1px;
  text-align: center;
  transform: rotate(-14deg);
  pointer-events: none;
  z-index: 7;
}

/* Recipient Cartouche */
.envelope-address {
  position: absolute;
  bottom: 22px;
  left: 50%;
  transform: translateX(-50%);
  width: 86%;
  background: rgba(255, 253, 248, 0.95);
  backdrop-filter: blur(4px);
  padding: 12px 18px 14px;
  border-radius: 8px;
  border: 1px solid rgba(197, 155, 72, 0.45);
  box-shadow: 0 4px 15px rgba(43, 33, 27, 0.08), inset 0 0 0 2px rgba(255, 255, 255, 0.9);
  text-align: center;
  z-index: 8;
  transition: var(--transition-smooth);
}

.envelope-address .to-label {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  font-weight: 700;
  display: block;
  margin-bottom: 2px;
}

.envelope-address .recipient-name {
  font-family: var(--font-script);
  font-size: 2.5rem;
  color: var(--color-ink);
  line-height: 1.1;
  text-shadow: 0 1px 2px rgba(255,255,255,0.8);
}

.envelope-address .recipient-desc {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-crimson);
  margin-top: 2px;
}

/* Triangular Flaps */
.envelope-flap-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 48%;
  background: var(--envelope-flap);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  transform-origin: top;
  transition: transform 0.9s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 10;
  box-shadow: 0 6px 12px rgba(43, 33, 27, 0.1);
  border-top: 1px solid rgba(255,255,255,0.3);
}

.envelope-flap-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 52%;
  background: #e2d2bf;
  clip-path: polygon(0 100%, 100% 100%, 50% 0%);
  z-index: 4;
}

.envelope-flap-left {
  position: absolute;
  top: 0;
  left: 0;
  width: 52%;
  height: 100%;
  background: #dbcbba;
  clip-path: polygon(0 0, 0 100%, 100% 50%);
  z-index: 3;
}

.envelope-flap-right {
  position: absolute;
  top: 0;
  right: 0;
  width: 52%;
  height: 100%;
  background: #d8c7b4;
  clip-path: polygon(100% 0, 100% 100%, 0 50%);
  z-index: 3;
}

/* Wax Seal */
.wax-seal-btn {
  position: absolute;
  top: 42%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 95px;
  height: 95px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 25;
  border-radius: 50%;
  outline: none;
  transition: var(--transition-bounce);
  -webkit-tap-highlight-color: transparent;
}

.wax-seal-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 50%;
  filter: drop-shadow(0 6px 14px rgba(70, 15, 25, 0.45));
  transition: var(--transition-smooth);
}

.wax-seal-btn:hover,
.wax-seal-btn:active {
  transform: translate(-50%, -50%) scale(1.12);
}

.wax-seal-btn:hover .wax-seal-img {
  filter: drop-shadow(0 10px 20px rgba(140, 29, 49, 0.6)) brightness(1.05);
}

.seal-pulse {
  position: absolute;
  inset: -6px;
  border-radius: 50%;
  border: 2px dashed rgba(197, 155, 72, 0.75);
  animation: rotatePulse 8s linear infinite;
  pointer-events: none;
}

@keyframes rotatePulse {
  0% { transform: rotate(0deg) scale(1); opacity: 0.6; }
  50% { transform: rotate(180deg) scale(1.08); opacity: 1; }
  100% { transform: rotate(360deg) scale(1); opacity: 0.6; }
}

.seal-tooltip {
  position: absolute;
  bottom: -36px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-family: var(--font-sans);
  font-size: 0.82rem;
  letter-spacing: 0.5px;
  font-weight: 600;
  color: var(--color-crimson);
  background: rgba(255, 253, 248, 0.96);
  padding: 5px 14px;
  border-radius: 14px;
  border: 1px solid var(--color-gold-light);
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  pointer-events: none;
  animation: bounceHint 2s infinite;
}

@keyframes bounceHint {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(-5px); }
}

.wax-seal-btn.breaking {
  animation: sealBreak 0.7s forwards ease;
}

@keyframes sealBreak {
  0% { transform: translate(-50%, -50%) scale(1.1); }
  40% { transform: translate(-50%, -50%) scale(1.25) rotate(10deg); filter: brightness(1.3); }
  100% { transform: translate(-50%, -50%) scale(0) rotate(-20deg); opacity: 0; }
}

.envelope.open .envelope-flap-top {
  transform: rotateX(180deg);
  z-index: 1;
}

/* ==========================================================================
   LETTER & PHOTOS SCREEN (Stage 2)
   ========================================================================== */
.letter-screen {
  display: none;
  opacity: 0;
  transform: translateY(40px) scale(0.97);
  transition: opacity 0.9s cubic-bezier(0.16, 1, 0.3, 1), transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
  width: 100%;
  max-width: 780px;
}

.letter-screen.visible {
  display: flex;
  flex-direction: column;
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* Parchment Letter Paper */
.parchment-sheet {
  background: var(--color-parchment);
  border-radius: 6px;
  padding: 50px 55px;
  box-shadow: var(--shadow-letter);
  border: 1px solid var(--color-parchment-border);
  position: relative;
  margin-bottom: 35px;
  overflow: hidden;
}

.parchment-sheet::before {
  content: '';
  position: absolute;
  inset: 12px;
  border: 1px solid rgba(197, 155, 72, 0.4);
  pointer-events: none;
  border-radius: 2px;
}

.parchment-sheet::after {
  content: '';
  position: absolute;
  inset: 16px;
  border: 1px dashed rgba(197, 155, 72, 0.2);
  pointer-events: none;
  border-radius: 2px;
}

/* Corner filigree */
.corner-ornament {
  position: absolute;
  width: 28px;
  height: 28px;
  border-color: var(--color-gold);
  border-style: solid;
  pointer-events: none;
}
.corner-tl { top: 20px; left: 20px; border-width: 2px 0 0 2px; }
.corner-tr { top: 20px; right: 20px; border-width: 2px 2px 0 0; }
.corner-bl { bottom: 20px; left: 20px; border-width: 0 0 2px 2px; }
.corner-br { bottom: 20px; right: 20px; border-width: 0 2px 2px 0; }

/* Letter Header */
.letter-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  border-bottom: 1px solid rgba(197, 155, 72, 0.25);
  padding-top: 16px;
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.letter-origin {
  display: flex;
  flex-direction: column;
  padding-top: 8px;
}

.letter-date {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.05rem;
  color: var(--color-ink-muted);
}

.letter-occasion-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  font-weight: 700;
  color: var(--color-crimson);
  background: var(--color-blush);
  padding: 4px 10px;
  border-radius: 20px;
  margin-top: 6px;
  width: fit-content;
  border: 1px solid rgba(140, 29, 49, 0.15);
}

.letter-stamp-holder {
  width: 75px;
  height: 75px;
  border: 1px solid rgba(0,0,0,0.08);
  box-shadow: 0 4px 8px rgba(0,0,0,0.08);
  transform: rotate(2deg);
  background: #fff;
  padding: 2px;
}

.letter-stamp-holder img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* Floral Watercolor Banner */
.letter-artwork {
  width: 100%;
  max-height: 220px;
  border-radius: 6px;
  overflow: hidden;
  margin-bottom: 28px;
  box-shadow: 0 6px 18px rgba(70, 48, 35, 0.08);
}

.letter-artwork img {
  width: 100%;
  height: 100%;
  max-height: 220px;
  object-fit: cover;
  display: block;
}

/* Salutation */
.letter-salutation {
  font-family: var(--font-script);
  font-size: 2.85rem;
  color: var(--color-crimson);
  line-height: 1.15;
  margin-bottom: 16px;
}

/* Letter Body */
.letter-body {
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--color-ink);
}

.letter-body p {
  margin-bottom: 20px;
  text-indent: 1.8rem;
}

.first-letter-dropcap::first-letter {
  font-family: var(--font-script);
  float: left;
  font-size: 4.2rem;
  line-height: 0.8;
  padding-top: 4px;
  padding-right: 10px;
  color: var(--color-gold-dark);
}

.letter-quote-callout {
  border-left: 3px solid var(--color-gold);
  padding: 12px 20px;
  margin: 24px 0;
  background: rgba(249, 235, 234, 0.45);
  border-radius: 0 8px 8px 0;
  font-style: italic;
  font-size: 1.25rem;
  color: var(--color-crimson-dark);
  text-indent: 0 !important;
}

/* Closing Signature */
.letter-closing {
  margin-top: 36px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-top: 1px dashed rgba(197, 155, 72, 0.3);
  padding-top: 22px;
}

.signature-block {
  display: flex;
  flex-direction: column;
}

.signature-valediction {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.15rem;
  color: var(--color-ink-muted);
}

.signature-name {
  font-family: var(--font-script);
  font-size: 2.85rem;
  color: var(--color-ink);
  line-height: 1.1;
  margin-top: 4px;
}

.signature-title {
  font-family: var(--font-sans);
  font-size: 0.78rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  font-weight: 600;
}

.closing-seal {
  width: 70px;
  height: 70px;
  opacity: 0.9;
  filter: drop-shadow(0 4px 8px rgba(140, 29, 49, 0.35));
}

.closing-seal img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ==========================================================================
   PHOTO MEMORIES SECTION (AUTHENTIC POLAROIDS)
   ========================================================================== */
.memories-section {
  width: 100%;
  margin-top: 10px;
  margin-bottom: 35px;
}

.section-header {
  text-align: center;
  margin-bottom: 26px;
}

.section-pretitle {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 2.5px;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  font-weight: 700;
}

.section-title {
  font-family: var(--font-script);
  font-size: 2.6rem;
  color: var(--color-crimson);
  line-height: 1.2;
}

.polaroid-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  align-items: start;
}

.polaroid-card {
  background: #ffffff;
  padding: 12px 12px 20px 12px;
  border-radius: 4px;
  box-shadow: 0 10px 25px rgba(43, 33, 27, 0.14), 0 2px 6px rgba(43, 33, 27, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition: var(--transition-bounce);
  cursor: pointer;
}

.polaroid-frame {
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 2px;
  background: #eee;
}

.polaroid-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s ease;
}

.polaroid-caption {
  font-family: var(--font-handwriting);
  font-size: 1.22rem;
  color: #382e29;
  text-align: center;
  margin-top: 12px;
  line-height: 1.3;
}

/* Organic photographic rotation angles */
.card-tilt-left {
  transform: rotate(-2.5deg);
}

.card-tilt-right {
  transform: rotate(2.2deg);
}

.card-tilt-straight {
  transform: rotate(-0.5deg);
}

.polaroid-card:hover {
  transform: translateY(-8px) rotate(0deg) scale(1.03);
  box-shadow: 0 20px 40px rgba(43, 33, 27, 0.22);
  z-index: 10;
}

.polaroid-card:hover .polaroid-frame img {
  transform: scale(1.04);
}

/* ==========================================================================
   INTERACTIVE BUTTON
   ========================================================================== */
.letter-interactive-bar {
  display: flex;
  justify-content: center;
  margin-top: 10px;
  margin-bottom: 30px;
}

.btn-primary-action {
  background: linear-gradient(135deg, var(--color-crimson), #a8243e);
  color: #fff;
  border: none;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  padding: 14px 30px;
  border-radius: 30px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 6px 20px rgba(140, 29, 49, 0.35);
  transition: var(--transition-bounce);
  -webkit-tap-highlight-color: transparent;
}

.btn-primary-action:hover,
.btn-primary-action:active {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 10px 25px rgba(140, 29, 49, 0.45);
}

/* Dynamic Floating Emojis / Hearts */
.floating-element {
  position: fixed;
  pointer-events: none;
  z-index: 999;
  user-select: none;
  animation: floatUpAndFade 3.5s forwards ease-out;
}

@keyframes floatUpAndFade {
  0% {
    transform: translate(0, 0) scale(0.6) rotate(0deg);
    opacity: 1;
  }
  100% {
    transform: translate(var(--dx), var(--dy)) scale(1.4) rotate(var(--rot));
    opacity: 0;
  }
}

/* Keyframes */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   MOBILE OPTIMIZATIONS (PERFECT FOR QR SCANS ON PHONES)
   ========================================================================== */
@media (max-width: 768px) {
  .page-container {
    padding: 20px 14px 60px;
  }

  .envelope-wrapper {
    height: 320px;
  }

  .envelope-stamp {
    width: 80px;
    height: 80px;
    top: 16px;
    right: 18px;
  }

  .postmark-overlay {
    top: 22px;
    right: 92px;
    width: 65px;
    height: 65px;
  }

  .envelope-address {
    width: 90%;
    bottom: 16px;
    padding: 10px 14px;
  }

  .envelope-address .recipient-name {
    font-size: 2.1rem;
  }

  .envelope-address .recipient-desc {
    font-size: 0.95rem;
  }

  .wax-seal-btn {
    width: 85px;
    height: 85px;
    top: 40%;
  }

  .parchment-sheet {
    padding: 48px 22px 34px;
  }

  .letter-salutation {
    font-size: 2.3rem;
  }

  .letter-body {
    font-size: 1.12rem;
    line-height: 1.75;
  }

  .letter-body p {
    text-indent: 1.2rem;
  }

  .polaroid-grid {
    grid-template-columns: 1fr;
    max-width: 320px;
    margin: 0 auto;
    gap: 20px;
  }

  .card-tilt-left,
  .card-tilt-right,
  .card-tilt-straight {
    transform: rotate(0deg);
  }

  .letter-closing {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .signature-name {
    font-size: 2.4rem;
  }
}