/* ==========================================================================
   A LITTLE SOMETHING FOR YOU — MASTER STYLESHEET
   Color System, Typography, 3D Card Geometry & Editorial Stationery
   ========================================================================== */

:root {
  /* Primary Palette */
  --color-paper-ivory: #F4E8D2;
  --color-burnt-orange: #B94E2C;
  --color-mulberry-burgundy: #702F32;
  --color-autumn-gold: #D6A849;
  --color-walnut-brown: #754B35;

  /* Supporting Colors */
  --color-deep-walnut: #3B2922;
  --color-dark-ink: #382B27;
  --color-muted-ink: #755F52;
  --color-paper-edge: #E3D3B8;

  /* Shadows (#241610 at 12% to 24% opacity) */
  --shadow-card-outer:
    0 14px 32px rgba(36, 22, 16, 0.24),
    0 3px 8px rgba(36, 22, 16, 0.16);
  --shadow-cover-open:
    -10px 16px 28px rgba(36, 22, 16, 0.22),
    -2px 4px 10px rgba(36, 22, 16, 0.14);
  --shadow-paper-sheet:
    0 10px 24px rgba(36, 22, 16, 0.18),
    0 2px 6px rgba(36, 22, 16, 0.12);
  --shadow-photo-frame:
    0 6px 16px rgba(36, 22, 16, 0.16),
    0 2px 4px rgba(36, 22, 16, 0.12);

  /* Typography Stacks */
  --font-display: 'Cormorant Garamond', Georgia, 'Times New Roman', serif;
  --font-reading: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-handwritten: 'Caveat', 'Bradley Hand', cursive, serif;

  /* Layout & Spacing */
  --card-max-width: 390px;
  --sheet-max-width: 540px;
  --page-gutter: clamp(16px, 4.5vw, 28px);
}

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

html {
  background-color: var(--color-deep-walnut);
  color: var(--color-dark-ink);
  font-family: var(--font-reading);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  -webkit-text-size-adjust: 100%;
  overflow-x: clip;
}

body {
  min-height: 100vh;
  min-height: 100svh;
  background-color: var(--color-deep-walnut);
  /* Restrained warm ambient light behind the stationery */
  background-image: radial-gradient(
    circle at 50% 34%,
    rgba(117, 75, 53, 0.22) 0%,
    rgba(59, 41, 34, 0) 70%
  );
  padding-top: env(safe-area-inset-top, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  padding-bottom: calc(48px + env(safe-area-inset-bottom, 0px));
  padding-left: env(safe-area-inset-left, 0px);
  overflow-x: clip;
}

/* Subtle natural paper grain utility for all ivory stationery surfaces */
.card-interior,
.card-cover-front,
.card-cover-back,
.spread-paper-sheet,
.stationery-sheet,
.closing-card {
  background-color: var(--color-paper-ivory);
  background-image:
    radial-gradient(rgba(117, 75, 53, 0.03) 1px, transparent 0),
    radial-gradient(rgba(56, 43, 39, 0.02) 1px, transparent 0);
  background-size: 24px 24px;
  background-position: 0 0, 12px 12px;
}

.experience-stage {
  width: 100%;
  max-width: 100%;
  margin: 0 auto;
  overflow-x: clip;
}

/* --------------------------------------------------------------------------
   Scene 1 & 2: Greeting Card Container & 3D Fold Geometry
   -------------------------------------------------------------------------- */
.card-scene {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(20px, 4vh, 44px) var(--page-gutter);
}

.card-viewport {
  width: min(86vw, var(--card-max-width));
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Parent container holding single authoritative 3D perspective */
.greeting-card {
  position: relative;
  width: 100%;
  aspect-ratio: 0.74;
  max-height: calc(100svh - 48px);
  perspective: 1500px;
  -webkit-perspective: 1500px;
  /* Gentle initial entrance */
  animation: cardInitialEntrance 620ms cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes cardInitialEntrance {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Fixed Inside Panel (Right-hand inside face of the card) */
.card-interior {
  position: absolute;
  inset: 0;
  border-radius: 3px 5px 5px 3px;
  border: 1px solid var(--color-paper-edge);
  box-shadow: var(--shadow-card-outer);
  overflow: hidden;
  z-index: 1;
  display: flex;
  flex-direction: column;
}

/* Subtle left spine fold crease */
.card-interior::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 14px;
  background: linear-gradient(
    to right,
    rgba(36, 22, 16, 0.12) 0%,
    rgba(227, 211, 184, 0.4) 55%,
    transparent 100%
  );
  pointer-events: none;
  z-index: 3;
}

.card-paper-frame {
  position: relative;
  flex: 1;
  margin: 12px;
  border: 1px solid var(--color-paper-edge);
  padding: clamp(22px, 5vw, 34px) clamp(18px, 4.5vw, 28px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
}

/* Hinged Front Cover Assembly */
.card-cover-hinge {
  position: absolute;
  inset: 0;
  transform-origin: 0% 50%;
  -webkit-transform-origin: 0% 50%;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  z-index: 4;
  transition: box-shadow 0.9s ease;
}

.card-cover-front,
.card-cover-back {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border-radius: 3px 5px 5px 3px;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

/* Front Cover Interactive Button */
.card-cover-front {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--color-paper-edge);
  box-shadow: var(--shadow-card-outer);
  cursor: pointer;
  padding: 12px;
  display: flex;
  flex-direction: column;
  text-align: center;
  color: var(--color-mulberry-burgundy);
  font-family: inherit;
  transform: rotateY(0deg) translateZ(1px);
  -webkit-transform: rotateY(0deg) translateZ(1px);
  transition: border-color 0.25s ease;
  -webkit-tap-highlight-color: transparent;
}

/* Visible Left Spine Line on Closed Cover */
.card-cover-front::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 8px;
  background: linear-gradient(
    to right,
    rgba(117, 75, 53, 0.22),
    rgba(227, 211, 184, 0.35) 60%,
    transparent
  );
  pointer-events: none;
}

.card-cover-front:hover {
  border-color: var(--color-walnut-brown);
}

.card-cover-front:focus-visible {
  outline: 2px solid var(--color-mulberry-burgundy);
  outline-offset: 4px;
}

.cover-paper-frame {
  flex: 1;
  width: 100%;
  border: 1px solid var(--color-paper-edge);
  padding: 5px;
  display: flex;
}

.cover-inner-border {
  flex: 1;
  width: 100%;
  border: 1px solid rgba(112, 47, 50, 0.35);
  padding: clamp(24px, 6vw, 38px) clamp(16px, 4vw, 26px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
}

.cover-heading-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 6px;
}

.cover-line {
  display: block;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.875rem, 6.8vw, 2.375rem); /* 30px to 38px */
  line-height: 1.16;
  color: var(--color-mulberry-burgundy);
  letter-spacing: -0.01em;
}

.cover-line--italic {
  font-style: italic;
  font-weight: 400;
}

.cover-illustration-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: auto 0;
}

.cover-maple-svg {
  width: clamp(86px, 24vw, 112px);
  height: clamp(86px, 24vw, 112px);
  display: block;
}

.cover-prompt {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-top: 1px solid var(--color-paper-edge);
  color: var(--color-walnut-brown);
  font-family: var(--font-reading);
  font-size: clamp(0.75rem, 3.2vw, 0.875rem); /* 12px to 14px */
  font-weight: 500;
  letter-spacing: 0.02em;
}

.cover-prompt-arrow {
  color: var(--color-burnt-orange);
  transition: transform 0.25s ease;
}

.card-cover-front:hover .cover-prompt-arrow {
  transform: translateX(3px);
}

/* Inside Surface of the Left Cover */
.card-cover-back {
  border: 1px solid var(--color-paper-edge);
  transform: rotateY(180deg);
  -webkit-transform: rotateY(180deg);
  padding: 12px;
  display: flex;
  box-shadow: var(--shadow-cover-open);
  pointer-events: none;
}

.cover-back-paper-frame {
  flex: 1;
  border: 1px solid var(--color-paper-edge);
  display: flex;
  align-items: flex-end;
  justify-content: flex-start;
  padding: 18px;
}

.cover-back-ornament {
  width: 28px;
  height: 28px;
  opacity: 0.65;
}

/* --------------------------------------------------------------------------
   Scene 2: Interior Greeting Typography & Drifting Leaves
   -------------------------------------------------------------------------- */
.interior-content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 290px;
}

.js-enabled .interior-content {
  opacity: 0;
  transform: translateY(12px);
}

.interior-cluster-svg {
  width: 132px;
  height: 52px;
  margin-bottom: 14px;
}

.interior-lead {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.2rem, 4.5vw, 1.4rem);
  color: var(--color-walnut-brown);
  margin-bottom: 6px;
}

.interior-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.5rem, 9vw, 3rem); /* 40px to 48px */
  line-height: 1.08;
  color: var(--color-mulberry-burgundy);
  margin-bottom: 12px;
}

.interior-subtitle {
  font-family: var(--font-reading);
  font-weight: 400;
  font-size: clamp(0.95rem, 3.8vw, 1.0625rem);
  color: var(--color-dark-ink);
}

.interior-divider {
  width: 56px;
  height: 1px;
  background-color: var(--color-paper-edge);
  margin: 22px auto 18px;
}

.scroll-cue {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-reading);
  font-size: clamp(0.75rem, 3vw, 0.8125rem);
  font-weight: 500;
  color: var(--color-muted-ink);
}

.scroll-cue-arrow {
  color: var(--color-burnt-orange);
}

/* Drifting Autumn Leaves inside Card Perimeter (Never crosses main heading) */
.falling-leaves-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 1;
}

.drift-leaf {
  position: absolute;
  top: -32px;
  width: 22px;
  height: 22px;
  opacity: 0;
}

.drift-leaf--1 { left: 10%; }
.drift-leaf--2 { right: 11%; width: 19px; height: 19px; }
.drift-leaf--3 { left: 18%; width: 17px; height: 17px; }
.drift-leaf--4 { right: 16%; width: 21px; height: 21px; }

/* CSS Fallback if GSAP does not load */
.greeting-card.css-fallback-open .card-cover-hinge {
  transform: rotateY(-148deg);
  transition: transform 1.05s cubic-bezier(0.33, 1, 0.68, 1);
}

.greeting-card.css-fallback-open .interior-content {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.55s ease 0.45s, transform 0.55s ease 0.45s;
}

/* --------------------------------------------------------------------------
   Keepsake Flow Container (Revealed in natural document flow once opened)
   -------------------------------------------------------------------------- */
.keepsake-flow {
  width: 100%;
  max-width: var(--sheet-max-width);
  margin: 0 auto;
  padding: 8px var(--page-gutter) 40px;
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 5vh, 44px);
}

/* When JS is active, keep below-the-fold scenes collapsed until card opens */
.js-enabled .keepsake-flow:not(.is-unfolded) {
  display: none;
}

.paper-spread {
  width: 100%;
}

/* --------------------------------------------------------------------------
   Scene 3: The Family Photographs
   -------------------------------------------------------------------------- */
.spread-paper-sheet {
  border-radius: 3px;
  border: 1px solid var(--color-paper-edge);
  box-shadow: var(--shadow-paper-sheet);
  padding: clamp(24px, 6vw, 40px) clamp(18px, 5vw, 34px);
  position: relative;
}

.botanical-header {
  display: flex;
  justify-content: center;
  margin-bottom: clamp(18px, 4vw, 28px);
}

.branch-svg {
  width: 156px;
  height: 48px;
}

.photo-album-composition {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 5.5vw, 34px);
  align-items: center;
}

.photo-frame {
  width: 100%;
  margin: 0;
}

/* Deliberate, balanced asymmetry for the two vertical portraits */
.photo-frame--primary {
  max-width: 84%;
  align-self: flex-start;
  transform: rotate(-1.15deg);
}

.photo-frame--secondary {
  max-width: 78%;
  align-self: flex-end;
  transform: rotate(1.35deg);
}

.js-enabled .photo-frame {
  opacity: 0;
}

.photo-print-border {
  background-color: var(--color-paper-ivory);
  border: 1px solid var(--color-paper-edge);
  box-shadow: var(--shadow-photo-frame);
  padding: clamp(10px, 2.6vw, 14px) clamp(10px, 2.6vw, 14px) clamp(18px, 4vw, 24px);
}

.photo-inner-mat {
  position: relative;
  width: 100%;
  aspect-ratio: var(--photo-aspect, 9 / 16);
  border: 1px solid var(--color-paper-edge);
  background-color: #EFE2C8;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.family-photo {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  position: relative;
  z-index: 2;
}

/* Restrained fallback if image file is not yet placed in assets/ */
.photo-missing-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
  color: var(--color-muted-ink);
  font-family: var(--font-display);
  font-size: 1.15rem;
  z-index: 1;
}

.photo-missing-fallback small {
  font-family: var(--font-reading);
  font-size: 0.75rem;
  margin-top: 4px;
  opacity: 0.8;
}

.album-caption {
  margin-top: clamp(24px, 5vw, 32px);
  text-align: center;
  font-family: var(--font-reading);
  font-size: clamp(0.8125rem, 3.3vw, 0.9375rem); /* 13px to 15px */
  font-weight: 400;
  color: var(--color-muted-ink);
}

/* --------------------------------------------------------------------------
   Scene 4 & 5: The Two Heartfelt Letters
   -------------------------------------------------------------------------- */
.stationery-sheet {
  position: relative;
  border-radius: 3px;
  border: 1px solid var(--color-paper-edge);
  box-shadow: var(--shadow-paper-sheet);
  padding: clamp(28px, 7vw, 46px) clamp(22px, 6vw, 42px);
  overflow: hidden;
}

.js-enabled .stationery-sheet {
  opacity: 0;
  transform: translateY(14px);
}

/* Daughter's Letter Subtle Corner Botanical Detail */
.stationery-corner-leaf {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 34px;
  height: 34px;
  opacity: 0.85;
}

/* Boyfriend's Letter Distinct Burnt Orange Edge Detail */
.stationery-sheet--boyfriend {
  padding-left: clamp(26px, 6.5vw, 46px);
}

.stationery-accent-edge {
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: 0;
  width: 3px;
  background-color: var(--color-burnt-orange);
  border-radius: 0 2px 2px 0;
}

.letter-header {
  margin-bottom: clamp(18px, 4.5vw, 26px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--color-paper-edge);
}

.letter-kicker {
  font-family: var(--font-reading);
  font-size: clamp(0.75rem, 3vw, 0.875rem); /* 12px to 14px */
  font-weight: 500;
  color: var(--color-muted-ink);
  margin-bottom: 4px;
}

.letter-heading {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.5625rem, 5.8vw, 1.875rem); /* 25px to 30px */
  line-height: 1.2;
  color: var(--color-mulberry-burgundy);
}

.letter-body {
  font-family: var(--font-reading);
  font-weight: 400;
  font-size: clamp(1rem, 4vw, 1.125rem); /* 16px to 18px */
  line-height: 1.74;
  color: var(--color-dark-ink);
  max-width: 64ch;
  text-align: left;
}

.letter-body p + p {
  margin-top: 1.15em;
}

.letter-signoff {
  margin-top: 26px;
  padding-top: 14px;
  border-top: 1px solid rgba(227, 211, 184, 0.7);
}

.signoff-closing {
  font-family: var(--font-reading);
  font-size: clamp(0.95rem, 3.8vw, 1.05rem);
  font-weight: 400;
  color: var(--color-walnut-brown);
}

.signoff-signature {
  font-family: var(--font-handwritten);
  font-weight: 400;
  font-size: clamp(1.25rem, 4.8vw, 1.4375rem); /* 20px to 23px */
  color: var(--color-mulberry-burgundy);
  margin-top: 4px;
  line-height: 1.3;
}

/* --------------------------------------------------------------------------
   Scene 6: Final Birthday Wish
   -------------------------------------------------------------------------- */
.closing-card {
  border-radius: 3px;
  border: 1px solid var(--color-paper-edge);
  box-shadow: var(--shadow-paper-sheet);
  padding: clamp(32px, 7.5vw, 48px) clamp(22px, 6vw, 38px);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.js-enabled .closing-card {
  opacity: 0;
  transform: translateY(14px);
}

.closing-leaf-svg {
  width: 32px;
  height: 32px;
  margin-bottom: 12px;
}

.closing-lead {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1.15rem, 4.2vw, 1.35rem);
  color: var(--color-walnut-brown);
  margin-bottom: 4px;
}

.closing-title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.75rem, 6.2vw, 2.25rem); /* 28px to 36px */
  line-height: 1.15;
  color: var(--color-mulberry-burgundy);
}

.closing-burgundy-line {
  width: 72px;
  height: 1px;
  background-color: var(--color-mulberry-burgundy);
  margin: 16px auto;
}

.closing-wish {
  font-family: var(--font-reading);
  font-weight: 400;
  font-size: clamp(0.95rem, 3.8vw, 1.0625rem);
  color: var(--color-dark-ink);
  max-width: 36ch;
}

/* --------------------------------------------------------------------------
   Responsive Refinements (Tablet & Desktop)
   -------------------------------------------------------------------------- */
@media (min-width: 768px) {
  .card-viewport {
    transition: transform 1.05s cubic-bezier(0.33, 1, 0.68, 1);
  }

  /* On wider viewports, subtly shift the open spread so both panels sit balanced */
  .card-viewport.is-open-spread {
    transform: translateX(28%);
  }

  .photo-frame--primary {
    max-width: 72%;
  }

  .photo-frame--secondary {
    max-width: 68%;
  }
}

@media (max-height: 660px) and (max-width: 480px) {
  /* Short mobile viewport protection so the closed card never crops */
  .greeting-card {
    width: min(80vw, 330px);
  }
  .cover-maple-svg {
    width: 74px;
    height: 74px;
  }
}

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

  .falling-leaves-layer {
    display: none !important;
  }

  .js-enabled .interior-content,
  .js-enabled .photo-frame,
  .js-enabled .stationery-sheet,
  .js-enabled .closing-card {
    opacity: 1 !important;
    transform: none !important;
  }
}