/* =========================================================================
   FRIENDSHIP DAY SCRAPBOOK — style.css
   Design tokens
   -------------------------------------------------------------------------
   Palette:   cream base, blush + bubblegum pink, buttery yellow, cocoa text
   Type:      Caveat (handwritten, for feeling) / Baloo 2 (bubbly headings)
              / Quicksand (soft rounded body)
   Signature: a "physical scrapbook" motif — wobbly hand-cut card edges,
              washi-tape corners, a polaroid photo and a wax-seal envelope —
              carried through every screen instead of flat rectangles.
   ========================================================================= */

:root {
  --cream: #fff8f0;
  --cream-deep: #fdeee0;
  --pink-light: #ffe1ec;
  --pink: #ff9fc4;
  --pink-deep: #ff6fa5;
  --yellow: #ffe9a8;
  --gold: #f4b860;
  --cocoa: #6b4a3f;
  --cocoa-soft: #8a6a5e;
  --white: #fffdf9;

  --font-hand: 'Caveat', cursive;
  --font-head: 'Baloo 2', system-ui, sans-serif;
  --font-body: 'Quicksand', system-ui, sans-serif;

  --radius: 22px;
  --shadow-soft: 0 10px 30px rgba(107, 74, 63, 0.14);
  --shadow-card: 0 14px 34px rgba(255, 111, 165, 0.22);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background:
    radial-gradient(circle at 15% 10%, var(--pink-light) 0%, transparent 45%),
    radial-gradient(circle at 85% 90%, var(--yellow) 0%, transparent 40%),
    var(--cream);
  color: var(--cocoa);
  font-family: var(--font-body);
  overflow-x: hidden;
}

h1, h2, h3 { margin: 0 0 8px; }

button, input, textarea { font-family: inherit; }

/* ---------------------------- layout shells ---------------------------- */

#app { position: relative; min-height: 100vh; }

.screen {
  display: none;
  min-height: 100vh;
  width: 100%;
  align-items: center;
  justify-content: center;
  padding: 32px 18px 56px;
  position: relative;
}

.screen.is-active {
  display: flex;
  animation: screenFadeIn 0.6s ease both;
}

@keyframes screenFadeIn {
  from { opacity: 0; transform: translateY(14px) scale(0.99); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.content-center {
  max-width: 480px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  z-index: 2;
}

.content-center.wide { max-width: 720px; }

/* ------------------------------ typography ------------------------------ */

.handwritten-heading {
  font-family: var(--font-hand);
  font-weight: 700;
  font-size: clamp(2.2rem, 8vw, 3.4rem);
  color: var(--pink-deep);
  text-shadow: 2px 2px 0 rgba(255, 233, 168, 0.6);
  line-height: 1.1;
}

.handwritten-heading.big { font-size: clamp(2.6rem, 10vw, 4.2rem); }

.rounded-heading {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(1.4rem, 5vw, 2rem);
  color: var(--cocoa);
}

.eyebrow {
  font-family: var(--font-head);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--pink-deep);
  margin: 0 0 6px;
}

.subtext {
  color: var(--cocoa-soft);
  font-size: 1.02rem;
  line-height: 1.5;
  max-width: 40ch;
}

/* -------------------------------- buttons -------------------------------- */

.btn {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  border-radius: 999px;
  padding: 14px 30px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.2s ease;
  -webkit-tap-highlight-color: transparent;
}

.btn-primary {
  background: linear-gradient(135deg, var(--pink-deep), var(--pink));
  color: var(--white);
  box-shadow: var(--shadow-card);
}

.btn-primary:hover { transform: translateY(-2px) scale(1.02); box-shadow: 0 18px 30px rgba(255, 111, 165, 0.3); }
.btn-primary:active { transform: translateY(0) scale(0.98); }
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-ghost {
  background: var(--white);
  color: var(--pink-deep);
  border: 2px solid var(--pink);
}
.btn-ghost:hover { background: var(--pink-light); transform: translateY(-1px); }
.btn.small { padding: 9px 18px; font-size: 0.88rem; }

.reveal-next { animation: popIn 0.5s ease both; }

@keyframes popIn {
  from { opacity: 0; transform: scale(0.7); }
  to   { opacity: 1; transform: scale(1); }
}

/* ------------------------------ ambient layer ------------------------------ */

.ambient-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.ambient-item {
  position: absolute;
  bottom: -60px;
  font-size: var(--size, 1.6rem);
  opacity: 0.75;
  animation: floatUp var(--dur, 12s) linear infinite;
  animation-delay: var(--delay, 0s);
  left: var(--x, 50%);
}

@keyframes floatUp {
  0%   { transform: translateY(0) translateX(0) rotate(0deg); opacity: 0; }
  10%  { opacity: 0.8; }
  50%  { transform: translateY(-52vh) translateX(18px) rotate(12deg); }
  90%  { opacity: 0.6; }
  100% { transform: translateY(-104vh) translateX(-10px) rotate(-8deg); opacity: 0; }
}

/* -------------------------------- music button -------------------------------- */

.music-btn {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--pink-deep), var(--gold));
  color: var(--white);
  font-size: 1.3rem;
  box-shadow: var(--shadow-card);
  cursor: pointer;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: gentleBob 2.6s ease-in-out infinite;
}

.music-btn.is-playing .music-icon { animation: spin 3.2s linear infinite; }
.music-btn:not(.is-playing) { opacity: 0.75; }

@keyframes gentleBob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-5px); }
}
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* -------------------------------- cards -------------------------------- */

.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: 30px 26px;
  position: relative;
}

/* wobbly hand-cut edge, the site's signature card shape */
.scrapbook-card {
  border-radius: 255px 15px 225px 15px / 15px 225px 15px 255px;
  border: 2px dashed var(--pink);
}

.scrapbook-card::before {
  content: '';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%) rotate(-4deg);
  width: 70px;
  height: 26px;
  background: rgba(255, 233, 168, 0.85);
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
}

/* -------------------------------- setup form -------------------------------- */

.setup-card { max-width: 440px; width: 100%; text-align: left; }
.setup-screen { align-items: flex-start; padding-top: 48px; }

.field {
  display: block;
  margin: 16px 0;
  font-family: var(--font-head);
  font-size: 0.85rem;
  color: var(--cocoa);
}

.field span { display: block; margin-bottom: 6px; }

.field input[type="text"],
.field textarea,
.field input[type="file"] {
  width: 100%;
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  border-radius: 14px;
  border: 2px solid var(--pink-light);
  background: var(--cream);
  color: var(--cocoa);
  resize: vertical;
}

.field input:focus, .field textarea:focus {
  outline: 3px solid var(--gold);
  outline-offset: 1px;
  border-color: var(--pink);
}

.hint { font-family: var(--font-body); font-size: 0.78rem; color: var(--cocoa-soft); display: block; margin-top: 4px; }

.photo-preview-wrap { margin: 10px 0; }
.photo-preview-wrap img { width: 100%; max-height: 220px; object-fit: cover; border-radius: 14px; box-shadow: var(--shadow-soft); }

#setupSubmitBtn { width: 100%; margin-top: 8px; }
.error-text { color: #d1436b; font-size: 0.85rem; margin-top: 8px; }

/* -------------------------------- page 1: balloon -------------------------------- */

.balloon-scene {
  position: absolute;
  top: 6%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: balloonDrift 6s ease-in-out infinite;
}

@keyframes balloonDrift {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-46%) translateY(-16px); }
}

.hot-air-balloon { position: relative; width: 120px; }
.balloon-canopy {
  width: 100px;
  height: 120px;
  margin: 0 auto;
  border-radius: 50% 50% 46% 46%;
  background: linear-gradient(160deg, var(--pink-deep), var(--yellow));
}
.balloon-stripes {
  position: absolute;
  top: 0; left: 10px;
  width: 80px; height: 120px;
  border-radius: 50% 50% 46% 46%;
  background: repeating-linear-gradient(90deg, transparent 0 12px, rgba(255,255,255,0.35) 12px 20px);
}
.balloon-basket {
  width: 34px; height: 22px;
  background: var(--cocoa-soft);
  border-radius: 4px;
  margin: 6px auto 0;
}

.sticker {
  position: absolute;
  font-size: 1.8rem;
  margin: 0;
  animation: wiggle 3.4s ease-in-out infinite;
}
.sticker-1 { top: 18%; left: 8%; animation-delay: 0.2s; }
.sticker-2 { top: 30%; right: 10%; animation-delay: 0.8s; }
.sticker-3 { bottom: 22%; left: 12%; animation-delay: 1.4s; }

@keyframes wiggle {
  0%, 100% { transform: rotate(-6deg); }
  50% { transform: rotate(8deg); }
}

/* -------------------------------- page 2: notification -------------------------------- */

.notif-card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 34px 30px;
  position: relative;
  animation: cardDrop 0.7s cubic-bezier(.34,1.56,.64,1) both;
}

@keyframes cardDrop {
  from { opacity: 0; transform: translateY(-30px) scale(0.9); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.notif-icon { font-size: 2.6rem; animation: gentleBob 2s ease-in-out infinite; }
.notif-dot {
  position: absolute;
  top: 14px; right: 14px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--pink-deep);
  box-shadow: 0 0 0 4px rgba(255, 111, 165, 0.25);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.3); }
}

/* -------------------------------- page 3: envelope -------------------------------- */
/* ---------- Improved Envelope ---------- */

.envelope{
    position:relative;
    width:320px;
    height:220px;
    margin:20px auto;
    background:none;
    border:none;
    cursor:pointer;
    perspective:1400px;
    padding:0;
}

.envelope-back{
    position:absolute;
    inset:0;
    background:#ffe4ef;
    border-radius:14px;
    box-shadow:0 15px 35px rgba(0,0,0,.15);
    overflow:hidden;
}

.envelope-letter{
    position:absolute;
    left:8%;
    bottom:12px;
    width:84%;
    height:88%;
    background:#fff;
    border-radius:10px;
    padding:20px;
    display:flex;
    justify-content:center;
    align-items:center;
    box-shadow:0 18px 35px rgba(0,0,0,.18);
    transform:translateY(58%);
    transition:transform .9s cubic-bezier(.25,1,.3,1);
    z-index:2;
}

.letter-text{
    font-family:var(--font-hand);
    font-size:1.35rem;
    line-height:1.5;
    text-align:center;
    color:var(--cocoa);
    opacity:0;
    transform:translateY(15px);
    transition:all .45s ease .55s;
}

.envelope-front{
    position:absolute;
    left:0;
    right:0;
    bottom:0;
    height:60%;
    background:var(--pink);
    border-radius:0 0 14px 14px;
    clip-path:polygon(0 0,50% 45%,100% 0,100% 100%,0 100%);
    z-index:3;
}

.envelope-flap{
    position:absolute;
    top:0;
    left:0;
    width:100%;
    height:56%;
    background:var(--pink-deep);
    clip-path:polygon(0 0,100% 0,50% 100%);
    transform-origin:top;
    transition:transform .8s ease,z-index .8s ease;
    z-index:5;
    backface-visibility:hidden;
}

.envelope-seal{
    position:absolute;
    left:50%;
    top:50%;
    transform:translate(-50%,-50%);
    font-size:1.8rem;
    z-index:6;
    transition:all .3s ease;
}

/* Open Animation */

.envelope.is-open .envelope-flap{
    transform:rotateX(180deg);
    z-index:0;
}

.envelope.is-open .envelope-seal{
    opacity:0;
    transform:translate(-50%,-50%) scale(0);
}

.envelope.is-open .envelope-letter{
    transform:translateY(-72%);
    z-index:10;
    animation:letterBounce .55s ease .8s;
}

.envelope.is-open .letter-text{
    opacity:1;
    transform:translateY(0);
}

@keyframes letterBounce{
    0%{
        transform:translateY(-72%);
    }
    35%{
        transform:translateY(-79%);
    }
    65%{
        transform:translateY(-68%);
    }
    100%{
        transform:translateY(-72%);
    }
}

/* -------------------------------- page 4: polaroid -------------------------------- */

.polaroid {
  background: var(--white);
  padding: 14px 14px 44px;
  border-radius: 4px;
  box-shadow: var(--shadow-card);
  transform: rotate(-3deg);
  width: min(78vw, 300px);
  margin: 10px auto;
}

.polaroid img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  border-radius: 2px;
  background: var(--pink-light);
}

.polaroid-caption {
  font-family: var(--font-hand);
  font-size: 1.3rem;
  color: var(--cocoa);
  text-align: center;
  margin: 10px 0 0;
}

.final-polaroid { transform: rotate(2deg); }

/* -------------------------------- page 5: quote cards -------------------------------- */

.quote-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 14px;
  width: 100%;
  margin: 8px 0;
}

.quote-card {
  perspective: 1000px;
  height: 170px;
  cursor: pointer;
}

.quote-card-inner {
  position: relative;
  width: 100%; height: 100%;
  transition: transform 0.6s cubic-bezier(.4,0,.2,1);
  transform-style: preserve-3d;
}

.quote-card.is-flipped .quote-card-inner { transform: rotateY(180deg); }

.quote-face {
  position: absolute; inset: 0;
  backface-visibility: hidden;
  border-radius: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 12px;
  box-shadow: var(--shadow-soft);
}

.quote-front {
  background: linear-gradient(155deg, var(--pink-light), var(--yellow));
}
.quote-front .quote-emoji { font-size: 2rem; margin-bottom: 6px; }
.quote-front .quote-title { font-family: var(--font-head); font-weight: 600; font-size: 0.9rem; color: var(--cocoa); text-align: center; }

.quote-back {
  background: var(--white);
  transform: rotateY(180deg);
  border: 2px solid var(--pink);
}
.quote-back p {
  font-family: var(--font-hand);
  font-size: 1.15rem;
  color: var(--cocoa);
  text-align: center;
  margin: 0;
}

/* -------------------------------- page 6: agreement -------------------------------- */

.agreement-list {
  list-style: none;
  padding: 0;
  margin: 6px 0;
  width: 100%;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.agreement-item {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--white);
  border-radius: 14px;
  padding: 12px 16px;
  box-shadow: var(--shadow-soft);
  font-family: var(--font-body);
  font-weight: 600;
  color: var(--cocoa);
}

.agreement-item input[type="checkbox"] {
  width: 20px; height: 20px;
  accent-color: var(--pink-deep);
  flex-shrink: 0;
}

.agreement-item.is-required { border: 2px dashed var(--pink-deep); }

/* -------------------------------- page 7: door -------------------------------- */

.knock-heading { animation: wiggle 2s ease-in-out infinite; }

.door-scene { width: 220px; height: 260px; margin: 12px auto; perspective: 900px; }
.door-frame {
  position: relative;
  width: 100%; height: 100%;
  background: var(--cocoa-soft);
  border-radius: 10px 10px 4px 4px;
  overflow: hidden;
}

.door-reveal {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.2rem;
  background: linear-gradient(160deg, var(--pink-light), var(--yellow));
}

.door-panel {
  position: absolute; top: 0; bottom: 0; width: 50%;
  background: linear-gradient(160deg, var(--pink-deep), var(--pink));
  border: 2px solid var(--white);
  transition: transform 0.9s cubic-bezier(.4,0,.2,1);
  transform-origin: left center;
  z-index: 2;
}
.door-left { left: 0; transform-origin: left center; }
.door-right { left: 50%; transform-origin: right center; }

.door-scene.is-open .door-left { transform: rotateY(-110deg); }
.door-scene.is-open .door-right { transform: rotateY(110deg); }

.door-buttons {
  display: flex;
  gap: 14px;
  justify-content: center;
  position: relative;
  min-height: 54px;
}

#doorNoBtn { position: relative; transition: transform 0.15s ease-out; }

/* -------------------------------- page 8: balloons -------------------------------- */

.balloon-row {
  display: flex;
  gap: 20px;
  justify-content: center;
  margin: 20px 0;
  flex-wrap: wrap;
}

.pop-balloon {
  width: 78px;
  height: 96px;
  border-radius: 50% 50% 48% 48%;
  border: none;
  cursor: pointer;
  position: relative;
  box-shadow: var(--shadow-soft);
  animation: balloonBob 2.4s ease-in-out infinite;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.pop-balloon:nth-child(1) { background: linear-gradient(160deg, var(--pink-deep), var(--pink)); animation-delay: 0s; }
.pop-balloon:nth-child(2) { background: linear-gradient(160deg, var(--gold), var(--yellow)); animation-delay: 0.4s; }
.pop-balloon:nth-child(3) { background: linear-gradient(160deg, #ff9fc4, #ffd6e8); animation-delay: 0.8s; }

.pop-balloon.is-popped { transform: scale(1.5); opacity: 0; pointer-events: none; }

@keyframes balloonBob {
  0%, 100% { transform: translateY(0) rotate(-2deg); }
  50% { transform: translateY(-10px) rotate(2deg); }
}

.wish-bubble {
  font-family: var(--font-hand);
  font-size: 1.15rem;
  background: var(--white);
  border-radius: 14px;
  padding: 10px 14px;
  box-shadow: var(--shadow-soft);
  margin-top: -4px;
  animation: popIn 0.4s ease both;
}

.big-message {
  font-family: var(--font-hand);
  font-size: clamp(1.6rem, 6vw, 2.2rem);
  color: var(--pink-deep);
  margin-top: 12px;
  animation: popIn 0.6s ease both;
}

/* -------------------------------- final page -------------------------------- */

.final-message {
  font-family: var(--font-hand);
  font-size: 1.5rem;
  color: var(--cocoa);
  max-width: 40ch;
  line-height: 1.4;
}

.final-signature {
  font-family: var(--font-head);
  font-weight: 600;
  color: var(--pink-deep);
}

.finish-box { margin-top: 10px; width: 100%; }

.share-result {
  margin-top: 14px;
  background: var(--white);
  border-radius: 14px;
  padding: 14px;
  box-shadow: var(--shadow-soft);
}

.share-link-row { display: flex; gap: 8px; margin-top: 8px; }
.share-link-row input {
  flex: 1;
  padding: 10px 12px;
  border-radius: 10px;
  border: 2px solid var(--pink-light);
  font-family: var(--font-body);
  font-size: 0.85rem;
  background: var(--cream);
  color: var(--cocoa);
}

/* -------------------------------- confetti -------------------------------- */

.confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 999;
}

.confetti-piece {
  position: absolute;
  top: -12px;
  width: 8px;
  height: 14px;
  opacity: 0.9;
  animation: confettiFall linear forwards;
}

@keyframes confettiFall {
  to { transform: translateY(110vh) rotate(540deg); opacity: 0.4; }
}

/* -------------------------------- responsive -------------------------------- */

@media (min-width: 640px) {
  .screen { padding: 48px 24px 72px; }
  .quote-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 380px) {
  .envelope { width: 220px; height: 150px; }
  .door-scene { width: 190px; height: 220px; }
}