/* ============================================================
   renai.club — Le Salon Renai · est. 1962
   Mid-century paper-cut keepsake album
   ============================================================ */

:root {
  --paper:        #f6ead6;  /* washi cream */
  --saffron:      #f0c065;  /* sun wash */
  --persimmon:    #e07a4f;  /* lover A, stamps */
  --sage:         #9bb168;  /* paper river, leaves */
  --yuzu:         #6a8caf;  /* sky wash, marginalia */
  --plum:         #c25d6e;  /* wax seal, cherry centers */
  --cocoa:        #3a2a22;  /* warm dark ink */
  --brass:        #c79358;  /* corner brackets */
  --paper-shade:  #ecd9b6;  /* a half-tone lower paper */
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { width: 100%; }
html { scroll-behavior: smooth; }
body {
  font-family: "DM Sans", system-ui, sans-serif;
  font-weight: 400;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--cocoa);
  background: var(--paper);
  overflow-x: hidden;
  position: relative;
  /* Subtle washi paper grain - a tiled SVG noise pattern */
  background-image:
    radial-gradient(circle at 20% 30%, rgba(240,192,101,0.05) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(155,177,104,0.05) 0%, transparent 60%);
}

body::before {
  /* Tiled paper noise overlay at low opacity (0.06) per the design spec */
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='240' height='240' viewBox='0 0 240 240'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.227  0 0 0 0 0.165  0 0 0 0 0.133  0 0 0 0.18 0'/></filter><rect width='240' height='240' filter='url(%23n)'/></svg>");
  background-size: 240px 240px;
  opacity: 0.06;
  z-index: 800;
  mix-blend-mode: multiply;
}

.svg-defs { position: absolute; width: 0; height: 0; pointer-events: none; }

#album {
  position: relative;
  width: 100%;
  overflow: hidden;
}

/* ============================================================
   SCENE: shared
   ============================================================ */
.scene {
  position: relative;
  width: 100%;
  min-height: 88vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6vh 4vw;
  perspective: 1800px;
  transform-style: preserve-3d;
  isolation: isolate;
}

.scene--hero {
  min-height: 100vh;
}

/* Watercolor wash stack — three radial-gradient blobs filtered as bleeds */
.watercolor-stack {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.wash {
  position: absolute;
  border-radius: 50%;
  mix-blend-mode: multiply;
  filter: url(#watercolor-bleed);
  opacity: 0.55;
}

.wash--saffron {
  width: 70vw; height: 70vw;
  top: -10vw; left: -8vw;
  background: radial-gradient(circle at 50% 50%, var(--saffron) 0%, rgba(240,192,101,0.55) 38%, rgba(240,192,101,0) 70%);
}
.wash--sage {
  width: 60vw; height: 60vw;
  bottom: -14vw; right: -10vw;
  background: radial-gradient(circle at 50% 50%, var(--sage) 0%, rgba(155,177,104,0.45) 40%, rgba(155,177,104,0) 70%);
}
.wash--yuzu {
  width: 56vw; height: 56vw;
  top: 28vh; left: 36vw;
  background: radial-gradient(circle at 50% 50%, var(--yuzu) 0%, rgba(106,140,175,0.42) 42%, rgba(106,140,175,0) 70%);
  opacity: 0.42;
}
.wash--persimmon {
  width: 68vw; height: 68vw;
  top: -6vw; right: -12vw;
  background: radial-gradient(circle at 50% 50%, var(--persimmon) 0%, rgba(224,122,79,0.4) 40%, rgba(224,122,79,0) 70%);
  opacity: 0.48;
}
.wash--plum {
  width: 50vw; height: 50vw;
  bottom: -8vw; left: -6vw;
  background: radial-gradient(circle at 50% 50%, var(--plum) 0%, rgba(194,93,110,0.4) 40%, rgba(194,93,110,0) 70%);
  opacity: 0.4;
}

/* IntersectionObserver-triggered bleed-in: each scene's wash circle expands */
.scene .wash {
  clip-path: circle(0% at 30% 35%);
  transition: clip-path 1600ms cubic-bezier(.22,.8,.2,1);
}
.scene.in-view .wash--saffron { clip-path: circle(140% at 30% 35%); }
.scene.in-view .wash--yuzu    { clip-path: circle(140% at 64% 56%); }
.scene.in-view .wash--sage    { clip-path: circle(140% at 78% 78%); }
.scene.in-view .wash--persimmon { clip-path: circle(140% at 20% 30%); }
.scene.in-view .wash--plum    { clip-path: circle(140% at 70% 82%); }

/* ============================================================
   HERO CARD STAGE — 4 layered planes, hero-dominant
   ============================================================ */
.card-stage {
  position: relative;
  width: min(78vw, 720px);
  height: 88vh;
  max-height: 88vh;
  transform-style: preserve-3d;
  transform: rotate(-1.2deg);
  z-index: 1;
}

.card-plane {
  position: absolute;
  inset: 0;
  border-radius: 4px;
  transform-style: preserve-3d;
  pointer-events: none;
}

.card-plane--paper {
  background: var(--paper);
  box-shadow:
    0 30px 60px -28px rgba(58,42,34,0.32),
    0 6px 14px -8px rgba(58,42,34,0.18),
    inset 0 0 0 1px rgba(199,147,88,0.25);
  transform: translateZ(0);
  /* a softer torn-paper edge via clip-path */
  clip-path: polygon(
    0.6% 0.4%, 99.2% 0.6%, 99.6% 99.4%, 0.4% 99.2%
  );
}

.card-plane--paper::after {
  /* a faint washi grain on the card */
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='0.95' numOctaves='2'/><feColorMatrix values='0 0 0 0 0.78  0 0 0 0 0.58  0 0 0 0 0.34  0 0 0 0.12 0'/></filter><rect width='180' height='180' filter='url(%23g)'/></svg>");
  opacity: 0.5;
  mix-blend-mode: multiply;
  pointer-events: none;
}

.emboss-seal {
  position: absolute;
  top: 18px;
  right: 22px;
  opacity: 0.65;
  filter: drop-shadow(0 1px 0 rgba(255,255,255,0.5));
}

.card-plane--portrait {
  transform: translateZ(18px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8% 6% 38% 6%;
}
.paper-cut-lovers {
  width: 100%;
  height: auto;
  max-height: 60%;
  pointer-events: auto;
}
.paper-cut-lover {
  transform-origin: center center;
  transition: transform 360ms cubic-bezier(.2,.8,.2,1);
  cursor: pointer;
}
.paper-cut-lover--left.leaning  { transform: translateX(6px) rotate(-2deg); }
.paper-cut-lover--right.leaning { transform: translateX(-6px) rotate(2deg); }

.daisy-mark { transform-origin: center center; animation: daisy-sway 7s ease-in-out infinite; }
@keyframes daisy-sway {
  0%,100% { transform: translate(200px, 110px) rotate(-2deg); }
  50%     { transform: translate(200px, 110px) rotate(3deg); }
}

.card-plane--type {
  transform: translateZ(40px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  padding: 6% 6% 8% 6%;
  text-align: center;
  pointer-events: auto;
}

.kicker {
  font-family: "Caveat", cursive;
  font-size: clamp(1rem, 1.6vw, 1.3rem);
  color: var(--plum);
  letter-spacing: 0.18em;
  transform: skewX(-3deg) rotate(-0.6deg);
  margin-bottom: 0.2em;
  opacity: 0.92;
}

.wordmark {
  font-family: "Quicksand", sans-serif;
  font-weight: 700;
  font-size: clamp(4.4rem, 11vw, 9.5rem);
  letter-spacing: -0.018em;
  line-height: 0.92;
  color: var(--cocoa);
  transform: rotate(-2.4deg);
  display: inline-flex;
  flex-wrap: nowrap;
  margin: 0.08em 0 0.1em 0;
  cursor: pointer;
  user-select: none;
}

.wm-letter, .wm-dot {
  display: inline-block;
  transform-origin: center 70%;
  transition: transform 280ms cubic-bezier(.2,.8,.2,1);
  will-change: transform;
}

.wm-dot {
  color: var(--persimmon);
  margin: 0 -0.04em;
}

.sub-line {
  font-family: "Fraunces", serif;
  font-style: italic;
  font-weight: 500;
  font-size: clamp(0.95rem, 1.6vw, 1.2rem);
  color: var(--cocoa);
  opacity: 0.85;
  margin-top: 0.4em;
  font-variation-settings: "SOFT" 100, "WONK" 1;
  max-width: 22ch;
}

.stamp-wobble {
  position: absolute;
  right: -14px;
  bottom: -10px;
  width: 140px;
  height: 140px;
  animation: stamp-tilt 4.2s ease-in-out infinite;
  transform-origin: center center;
}
@keyframes stamp-tilt {
  0%,100% { transform: rotate(-8deg); }
  50%     { transform: rotate(-6.4deg); }
}

.card-plane--vellum {
  transform: translateZ(58px);
  pointer-events: none;
  overflow: hidden;
  border-radius: 4px;
}

.vellum-particles {
  width: 100%;
  height: 100%;
  display: block;
}

/* ============================================================
   CORNER BRACKETS — lift away on cursor approach
   ============================================================ */
.card-corner {
  position: absolute;
  width: 60px;
  height: 60px;
  z-index: 3;
  transition: transform 320ms cubic-bezier(.2,.8,.2,1), opacity 320ms;
  pointer-events: none;
  filter: drop-shadow(0 2px 0 rgba(58,42,34,0.18));
}
.card-corner--tl { top: -10px; left: -10px; }
.card-corner--tr { top: -10px; right: -10px; transform: scaleX(-1); }
.card-corner--bl { bottom: -10px; left: -10px; transform: scaleY(-1); }
.card-corner--br { bottom: -10px; right: -10px; transform: scale(-1,-1); }

.card-corner.lift--tl { transform: translate(-6px, -6px) rotate(-4deg); }
.card-corner.lift--tr { transform: scaleX(-1) translate(-6px, -6px) rotate(4deg); }
.card-corner.lift--bl { transform: scaleY(-1) translate(-6px, -6px) rotate(4deg); }
.card-corner.lift--br { transform: scale(-1,-1) translate(-6px, -6px) rotate(-4deg); }

/* ============================================================
   SCROLL HINT
   ============================================================ */
.scroll-hint {
  position: absolute;
  bottom: 2vh;
  left: 50%;
  transform: translateX(-50%) rotate(-1.4deg);
  font-family: "Caveat", cursive;
  color: var(--cocoa);
  opacity: 0.55;
  font-size: 1.05rem;
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 4;
}
.hint-line {
  display: inline-block;
  width: 38px;
  height: 1px;
  background: var(--cocoa);
  position: relative;
  animation: hint-grow 2.6s ease-in-out infinite;
}
@keyframes hint-grow {
  0%,100% { width: 14px; }
  50%     { width: 46px; }
}

/* ============================================================
   LETTER SCENES — 80vh portrait cards, each tilted differently
   ============================================================ */
.scene--letter-1 .letter-card { transform: rotate(-1.6deg); }
.scene--letter-2 .letter-card { transform: rotate(2.1deg); }
.scene--letter-3 .letter-card { transform: rotate(-0.9deg); }

.letter-card {
  position: relative;
  width: min(78vw, 720px);
  min-height: 80vh;
  background: var(--paper);
  border-radius: 4px;
  box-shadow:
    0 28px 56px -26px rgba(58,42,34,0.32),
    0 6px 14px -8px rgba(58,42,34,0.18),
    inset 0 0 0 1px rgba(199,147,88,0.22);
  padding: 6vh 7% 5vh 12%;
  z-index: 1;
  isolation: isolate;
  transition: transform 600ms cubic-bezier(.2,.8,.2,1);
}
.letter-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/><feColorMatrix values='0 0 0 0 0.78  0 0 0 0 0.58  0 0 0 0 0.34  0 0 0 0.1 0'/></filter><rect width='180' height='180' filter='url(%23g)'/></svg>");
  opacity: 0.5;
  mix-blend-mode: multiply;
  pointer-events: none;
  border-radius: 4px;
}

.letter-banner {
  border-bottom: 1.4px solid var(--cocoa);
  padding-bottom: 0.6em;
  margin-bottom: 1.4em;
  filter: url(#ink-wobble);
}

.letter-number {
  font-family: "Caveat", cursive;
  font-size: 1.4rem;
  color: var(--plum);
  letter-spacing: 0.08em;
  transform: skewX(-3deg);
  display: inline-block;
}

.letter-title {
  font-family: "Fraunces", serif;
  font-style: italic;
  font-weight: 500;
  font-size: clamp(2rem, 4.4vw, 3.4rem);
  font-variation-settings: "SOFT" 100, "WONK" 1;
  color: var(--cocoa);
  line-height: 1.05;
  margin-top: 0.1em;
  letter-spacing: -0.012em;
}

.scene--letter-1 .letter-title { color: var(--persimmon); }
.scene--letter-2 .letter-title { color: var(--yuzu); }
.scene--letter-3 .letter-title { color: var(--plum); }

.letter-body {
  position: relative;
  max-width: 56ch;
}

.letter-prose {
  font-family: "DM Sans", sans-serif;
  font-weight: 400;
  font-size: 1.08rem;
  line-height: 1.72;
  color: var(--cocoa);
  margin-bottom: 1.2em;
}
.letter-prose em {
  font-family: "Fraunces", serif;
  font-style: italic;
  font-weight: 500;
  font-variation-settings: "SOFT" 100, "WONK" 1;
  color: var(--persimmon);
}

.caveat-note {
  font-family: "Caveat", cursive;
  font-size: 1.2rem;
  color: var(--plum);
  transform: skewX(-3deg);
  display: inline-block;
  margin-left: 0.2em;
  opacity: 0.9;
}

.kanji-romaji {
  font-family: "Fraunces", serif;
  font-weight: 500;
  font-style: italic;
  color: var(--yuzu);
}

.letter-signoff {
  margin-top: 2em;
  text-align: right;
}
.caveat-signoff {
  font-family: "Caveat", cursive;
  font-size: 1.4rem;
  color: var(--cocoa);
  transform: skewX(-3deg) rotate(-1deg);
  display: inline-block;
  opacity: 0.92;
}

/* Margin pen — left side of letter body */
.margin-pen {
  position: absolute;
  top: 0;
  left: -7%;
  width: 28px;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}
.pen-nib {
  transition: transform 80ms linear;
}
.pen-stroke {
  /* stroke-dashoffset is driven by JS based on IntersectionObserver ratio */
}

/* Decorative marks */
.postage-strip,
.paper-airplane,
.torn-divider {
  position: absolute;
  pointer-events: none;
}
.postage-strip {
  bottom: 28px;
  left: 12%;
  width: 60%;
  height: 28px;
  opacity: 0.55;
}
.paper-airplane {
  top: 6vh;
  right: 6%;
  width: 80px;
  animation: airplane-drift 8s ease-in-out infinite;
  transform-origin: center;
}
@keyframes airplane-drift {
  0%,100% { transform: translate(0,0) rotate(-6deg); }
  50%     { transform: translate(8px,-10px) rotate(2deg); }
}
.torn-divider {
  bottom: 0;
  left: 0;
  width: 100%;
  height: 24px;
  opacity: 0.5;
}

/* ============================================================
   FOOTER — Wax seal
   ============================================================ */
.album-footer {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8vh 4vw 6vh;
  position: relative;
  z-index: 1;
}

.wax-seal {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  outline: none;
  position: relative;
  filter: drop-shadow(0 8px 14px rgba(58,42,34,0.28));
}
.wax-seal-svg {
  display: block;
  transition: transform 320ms cubic-bezier(.2,.8,.2,1);
  transform-origin: center;
  animation: seal-breathe 5.6s ease-in-out infinite;
}
@keyframes seal-breathe {
  0%,100% { transform: rotate(-3deg) scale(1); }
  50%     { transform: rotate(-1deg) scale(1.015); }
}

#seal-left, #seal-right {
  opacity: 0;
  transform-origin: 100px 100px;
  transition: transform 720ms cubic-bezier(.18,.7,.2,1), opacity 720ms;
}

.wax-seal.cracked .seal-whole {
  opacity: 0;
  transition: opacity 80ms;
}
.wax-seal.cracked #seal-left {
  opacity: 1;
  transform: translate(-46px, 28px) rotate(-22deg);
}
.wax-seal.cracked #seal-right {
  opacity: 1;
  transform: translate(46px, 32px) rotate(24deg);
}
.wax-seal.cracked .wax-seal-svg {
  animation: none;
}

.wax-message {
  font-family: "Caveat", cursive;
  font-size: 1.4rem;
  color: var(--plum);
  margin-top: 1.6em;
  opacity: 0;
  transform: translateY(8px) skewX(-3deg);
  transition: opacity 600ms ease, transform 600ms ease;
  text-align: center;
  max-width: 36ch;
}
.wax-seal.cracked .wax-message {
  opacity: 0.92;
  transform: translateY(0) skewX(-3deg);
}

.footer-mark {
  margin-top: 2.6em;
  font-family: "Caveat", cursive;
  font-size: 1.1rem;
  color: var(--cocoa);
  opacity: 0.58;
  letter-spacing: 0.06em;
  transform: rotate(-0.4deg);
}

/* ============================================================
   AMBIENT INK & PETAL CANVASES
   ============================================================ */
.ink-canvas, .petal-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 200;
}
.petal-canvas { z-index: 220; }

.ink-dot {
  fill: var(--cocoa);
  opacity: 0.18;
  transform-box: fill-box;
  transform-origin: center;
}

.petal {
  transform-box: fill-box;
  transform-origin: center;
  filter: url(#ink-wobble);
}

/* ============================================================
   REDUCED MOTION — halve particle activity, never disable
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .stamp-wobble, .wax-seal-svg, .daisy-mark, .paper-airplane, .hint-line {
    animation: none;
  }
}

/* ============================================================
   RESPONSIVE — narrow viewports
   ============================================================ */
@media (max-width: 720px) {
  .card-stage { width: 88vw; height: 88vh; }
  .letter-card { width: 88vw; padding: 5vh 6% 5vh 16%; }
  .wordmark { font-size: clamp(3.4rem, 14vw, 6rem); }
  .sub-line { font-size: 0.95rem; }
  .stamp-wobble { width: 96px; height: 96px; right: -6px; bottom: -6px; }
  .stamp-wobble svg { width: 96px; height: 96px; }
  .margin-pen { left: -10%; width: 18px; }
  .letter-title { font-size: clamp(1.6rem, 7vw, 2.4rem); }
}

@media (max-width: 420px) {
  .scene { padding: 4vh 2vw; }
  .card-stage { width: 92vw; }
  .letter-card { width: 92vw; padding: 4vh 6% 4vh 14%; }
  .wordmark { font-size: clamp(2.8rem, 16vw, 4.6rem); }
}