/* =============================================================
   BIRTHDAY WEBSITE — STYLESHEET
   -------------------------------------------------------------
   Organized in sections:
   1. Variables (colors, fonts, spacing) — change the look here
   2. Reset & base styles
   3. Shared components (buttons, decorative elements)
   4. Hero / opening screen
   5. Story chapters (shared chapter styling)
   6. Timeline (Our Story)
   7. Gallery (Our Memories) + lightbox
   8. Love cards (Things I Love About You)
   9. Envelope & letter
   10. Inside jokes
   11. Surprise section
   12. Finale
   13. Music button
   14. Scroll-reveal animation system
   15. Responsive tweaks
   ============================================================= */


/* -------------------------------------------------------------
   1. VARIABLES — the whole palette & type system lives here.
   Change these and the entire site updates.
   ------------------------------------------------------------- */
:root {
  /* Colors */
  --color-cream: #FAF3EC;       /* main background, warm ivory paper */
  --color-paper: #FFFDF9;       /* card / paper surfaces */
  --color-blush: #E8C4C4;       /* soft dusty rose */
  --color-rose: #B5696B;        /* primary accent */
  --color-rose-deep: #8B4A4C;   /* darker rose, for hover states */
  --color-ink: #3A2E2E;         /* main text, warm near-black */
  --color-ink-soft: #7A6B68;    /* secondary/muted text */
  --color-sage: #9CAA8C;        /* muted green accent */
  --color-gold: #C9A56A;        /* antique gold accent */
  --color-line: rgba(58, 46, 46, 0.14); /* hairlines / stitches */

  /* Typography */
  --font-display: 'Cormorant Garamond', serif;
  --font-script: 'Caveat', cursive;
  --font-body: 'Jost', sans-serif;

  /* Layout */
  --max-width: 1080px;
  --radius: 6px;
  --shadow-soft: 0 18px 40px rgba(58, 46, 46, 0.10);
  --shadow-card: 0 10px 24px rgba(58, 46, 46, 0.08);

  /* Motion */
  --ease-soft: cubic-bezier(0.22, 1, 0.36, 1);
  --t-slow: 0.9s;
  --t-med: 0.5s;
  --t-fast: 0.25s;
}

/* -------------------------------------------------------------
   2. RESET & BASE STYLES
   ------------------------------------------------------------- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-cream);
  background-image:
    radial-gradient(circle at 15% 20%, rgba(232, 196, 196, 0.15), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(156, 170, 140, 0.10), transparent 45%);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 500;
  margin: 0;
  color: var(--color-ink);
}

p {
  margin: 0;
}

img {
  max-width: 100%;
  display: block;
}

button {
  font-family: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

/* Respect users who prefer less 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;
  }
}

/* Visible focus state for keyboard users */
a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-rose);
  outline-offset: 3px;
}


/* -------------------------------------------------------------
   3. SHARED COMPONENTS
   ------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.4rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 999px;
  transition: transform var(--t-fast) var(--ease-soft),
              box-shadow var(--t-fast) var(--ease-soft),
              background var(--t-fast) var(--ease-soft);
  -webkit-tap-highlight-color: transparent;
}

.btn--primary {
  background: var(--color-rose);
  color: var(--color-paper);
  box-shadow: 0 10px 24px rgba(181, 105, 107, 0.35);
}

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--color-rose-deep);
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(181, 105, 107, 0.4);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn--ghost {
  background: transparent;
  border: 1px solid var(--color-rose);
  color: var(--color-rose-deep);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--color-rose);
  color: var(--color-paper);
  transform: translateY(-2px);
}

/* Floating decorative petals drifting across the background */
.floating-decor {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
}

.petal {
  position: absolute;
  top: -5%;
  font-size: 1.2rem;
  color: var(--color-blush);
  opacity: 0.6;
  animation: drift linear infinite;
  will-change: transform;
}

.petal--sage { color: var(--color-sage); }
.petal--gold { color: var(--color-gold); }

@keyframes drift {
  from {
    transform: translateY(-10vh) translateX(0) rotate(0deg);
  }
  to {
    transform: translateY(110vh) translateX(var(--drift-x, 40px)) rotate(360deg);
  }
}


/* -------------------------------------------------------------
   4. HERO / OPENING SCREEN
   ------------------------------------------------------------- */
.hero {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 2rem;
  background: var(--color-cream);
  transition: opacity 1.1s var(--ease-soft), visibility 1.1s var(--ease-soft);
}

.hero.hero--closed {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.hero__decor {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero__line {
  position: absolute;
  top: 8%;
  left: 50%;
  transform: translateX(-50%);
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, transparent, var(--color-rose));
  opacity: 0.5;
}

.hero__eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  margin-bottom: 1.4rem;
}

.hero__title {
  font-size: clamp(2.2rem, 9vw, 5.5rem);
  font-style: italic;
  color: var(--color-rose-deep);
  line-height: 1.1;
  max-width: 100%;
  overflow-wrap: break-word;
  word-break: break-word;
  padding: 0 0.5rem;
}

.hero__subtitle {
  margin-top: 1.2rem;
  font-size: 1.05rem;
  color: var(--color-ink-soft);
  letter-spacing: 0.03em;
}

.hero__btn {
  margin-top: 3rem;
}

.hero__hint {
  margin-top: 1.4rem;
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  font-style: italic;
  opacity: 0.8;
}

/* Hero entrance choreography — each element fades/rises in with a delay */
.reveal-in {
  opacity: 0;
  transform: translateY(16px);
  animation: revealIn 1s var(--ease-soft) forwards;
  animation-delay: calc(var(--d, 0) * 0.18s + 0.2s);
}

@keyframes revealIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}


/* -------------------------------------------------------------
   5. STORY CHAPTERS — shared styling for each section
   ------------------------------------------------------------- */
.story {
  position: relative;
  z-index: 2;
}

.chapter {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 7rem 1.6rem;
}

.chapter--center {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.chapter__eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-rose);
  margin-bottom: 0.9rem;
}

.chapter__title {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.15;
  overflow-wrap: break-word;
  word-break: break-word;
}

.chapter__title--script {
  font-family: var(--font-script);
  font-weight: 600;
  color: var(--color-rose-deep);
  font-size: clamp(2.6rem, 7vw, 4.2rem);
  margin-top: 0.2rem;
}

.chapter__subtitle {
  margin-top: 0.8rem;
  color: var(--color-ink-soft);
  font-size: 1.05rem;
}

/* --- Intro chapter specifics --- */
.intro {
  text-align: center;
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.intro__message {
  max-width: 560px;
  margin: 2rem auto 0;
  font-size: 1.15rem;
  color: var(--color-ink-soft);
}

.scroll-cue {
  margin-top: 4rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
}

.scroll-cue span {
  width: 1px;
  height: 40px;
  background: var(--color-rose);
  opacity: 0.5;
  animation: pulseLine 2s ease-in-out infinite;
}

.scroll-cue p {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
}

@keyframes pulseLine {
  0%, 100% { transform: scaleY(1); opacity: 0.3; }
  50% { transform: scaleY(1.3); opacity: 0.7; }
}


/* -------------------------------------------------------------
   6. TIMELINE (Our Story)
   ------------------------------------------------------------- */
.timeline {
  position: relative;
  margin-top: 4rem;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.timeline__thread {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  border-left: 2px dashed var(--color-line);
}

.timeline__item {
  position: relative;
  width: 46%;
}

.timeline__item--right {
  align-self: flex-end;
}

.timeline__dot {
  position: absolute;
  top: 1.6rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-rose);
  box-shadow: 0 0 0 5px var(--color-cream), 0 0 0 6px var(--color-line);
}

.timeline__item:not(.timeline__item--right) .timeline__dot {
  right: -8.4%;
}

.timeline__item--right .timeline__dot {
  left: -8.4%;
}

.timeline__dot--gold {
  background: var(--color-gold);
}

.timeline__card {
  background: var(--color-paper);
  border-radius: var(--radius);
  padding: 1.8rem 2rem;
  box-shadow: var(--shadow-card);
  transition: transform var(--t-med) var(--ease-soft), box-shadow var(--t-med) var(--ease-soft);
}

.timeline__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.timeline__card--gold {
  border: 1px solid rgba(201, 165, 106, 0.4);
}

.timeline__date {
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-rose);
  margin-bottom: 0.5rem;
}

.timeline__title {
  font-size: 1.4rem;
  margin-bottom: 0.6rem;
}

.timeline__text {
  color: var(--color-ink-soft);
  font-size: 0.98rem;
}


/* -------------------------------------------------------------
   7. GALLERY (Our Memories) + Lightbox
   ------------------------------------------------------------- */
.polaroid-grid {
  margin-top: 3.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.6rem 2rem;
}

.polaroid {
  margin: 0;
  background: var(--color-paper);
  padding: 0.8rem 0.8rem 1.4rem;
  box-shadow: var(--shadow-card);
  transform: rotate(var(--tilt, 0deg));
  transition: transform var(--t-med) var(--ease-soft), box-shadow var(--t-med) var(--ease-soft);
  cursor: pointer;
}

.polaroid img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: var(--color-blush);
}

/* Shown automatically (via script.js) when a photo path hasn't been
   filled in yet, so the layout still looks intentional while you're
   still gathering your images. Disappears the moment a real photo
   loads correctly. */
.polaroid.img-missing img,
.finale__photo.img-missing img {
  display: none;
}

.polaroid.img-missing::before,
.finale__photo.img-missing::before {
  content: "add a photo here";
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  aspect-ratio: 1 / 1;
  font-family: var(--font-script);
  font-size: 1.2rem;
  color: var(--color-rose-deep);
  background: linear-gradient(135deg, var(--color-blush), #f2dede);
}

.finale__photo.img-missing::before {
  aspect-ratio: 4 / 5;
  font-size: 1.4rem;
}

.polaroid figcaption {
  margin-top: 0.9rem;
  font-family: var(--font-script);
  font-size: 1.15rem;
  text-align: center;
  color: var(--color-ink-soft);
}

.polaroid:hover,
.polaroid:focus-visible {
  transform: rotate(0deg) translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-soft);
  z-index: 2;
}

.gallery__hint {
  text-align: center;
  margin-top: 2.4rem;
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  font-style: italic;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  background: rgba(58, 46, 46, 0.82);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-med) var(--ease-soft), visibility var(--t-med) var(--ease-soft);
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox__figure {
  max-width: min(560px, 90vw);
  background: var(--color-paper);
  padding: 1rem 1rem 1.6rem;
  margin: 0;
  transform: scale(0.9);
  transition: transform var(--t-med) var(--ease-soft);
}

.lightbox.is-open .lightbox__figure {
  transform: scale(1);
}

.lightbox__figure img {
  width: 100%;
  max-height: 70vh;
  object-fit: contain;
  background: var(--color-blush);
}

.lightbox__figure figcaption {
  margin-top: 1rem;
  text-align: center;
  font-family: var(--font-script);
  font-size: 1.3rem;
  color: var(--color-ink-soft);
}

.lightbox__close {
  position: absolute;
  top: 1.6rem;
  right: 1.6rem;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-paper);
  padding: 0.4rem 0.8rem;
}


/* -------------------------------------------------------------
   8. LOVE CARDS (Things I Love About You)
   ------------------------------------------------------------- */
.love-grid {
  margin-top: 3.5rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.6rem;
}

.love-card {
  perspective: 1000px;
  height: 190px;
  width: 100%;
  text-align: left;
  -webkit-tap-highlight-color: transparent;
}

.love-card__inner {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  transition: transform 0.7s var(--ease-soft);
  transform-style: preserve-3d;
}

.love-card.is-flipped .love-card__inner {
  transform: rotateY(180deg);
}

.love-card__face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 1.6rem;
  border-radius: var(--radius);
  backface-visibility: hidden;
  box-shadow: var(--shadow-card);
}

.love-card__face--front {
  background: var(--color-paper);
  gap: 0.8rem;
}

.love-card__number {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--color-rose);
}

.love-card__face--front span:last-child {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-style: italic;
}

.love-card__face--back {
  background: var(--color-rose);
  color: var(--color-paper);
  transform: rotateY(180deg);
  font-size: 0.98rem;
  line-height: 1.6;
}

.love-card:hover .love-card__face--front {
  box-shadow: var(--shadow-soft);
}


/* -------------------------------------------------------------
   9. ENVELOPE & LETTER
   ------------------------------------------------------------- */
.envelope-wrap {
  margin-top: 3.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.envelope {
  position: relative;
  width: min(420px, 84vw);
  height: 270px;
  cursor: pointer;
}

.envelope__back,
.envelope__front {
  position: absolute;
  inset: 0;
  background: var(--color-blush);
  border-radius: 4px;
}

.envelope__back {
  background: #DDB9B9;
}

.envelope__front {
  clip-path: polygon(0 22%, 50% 58%, 100% 22%, 100% 100%, 0 100%);
  background: var(--color-blush);
  z-index: 3;
}

.envelope__flap {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 60%;
  background: #EFD3D3;
  clip-path: polygon(0 0, 100% 0, 50% 78%);
  transform-origin: top center;
  transition: transform 0.9s var(--ease-soft);
  z-index: 4;
}

.envelope__seal {
  position: absolute;
  top: 40%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #c97d7f, var(--color-rose-deep));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-paper);
  font-size: 1.3rem;
  box-shadow: 0 6px 14px rgba(139, 74, 76, 0.5);
  z-index: 6;
  transition: transform var(--t-med) var(--ease-soft), opacity var(--t-med) var(--ease-soft);
}

.envelope:hover .envelope__seal {
  transform: translate(-50%, -50%) scale(1.06);
}

.envelope__letter {
  position: absolute;
  left: 6%;
  right: 6%;
  bottom: 6%;
  top: 26%;
  background: var(--color-paper);
  border-radius: 3px;
  padding: 1.8rem 1.8rem;
  box-shadow: 0 4px 14px rgba(58, 46, 46, 0.15);
  overflow-y: auto;
  overflow-x: hidden;
  text-align: left;
  transform: translateY(0);
  opacity: 0;
  transition: transform 1s var(--ease-soft), opacity 0.4s ease;
  z-index: 2;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--color-ink);
}

.envelope__letter p {
  margin-bottom: 1rem;
  overflow-wrap: break-word;
}

.letter__salutation {
  font-family: var(--font-script);
  font-style: normal;
  font-size: 1.5rem;
  color: var(--color-rose-deep);
}

.letter__signoff {
  margin-top: 1.4rem;
  font-family: var(--font-script);
  font-style: normal;
  font-size: 1.5rem;
  color: var(--color-rose-deep);
}

/* Open state, toggled by JS */
.envelope.is-open .envelope__flap {
  transform: rotateX(180deg);
  z-index: 1;
}

.envelope.is-open .envelope__seal {
  opacity: 0;
  transform: translate(-50%, -140%) scale(0.6);
}

.envelope.is-open .envelope__letter {
  transform: translateY(-58%);
  opacity: 1;
  z-index: 5;
  transition: transform 1s var(--ease-soft) 0.15s, opacity 0.6s ease 0.35s;
}

.envelope.is-open .envelope__front {
  z-index: 1;
}

.envelope__hint {
  margin-top: 1.6rem;
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  font-style: italic;
}


/* -------------------------------------------------------------
   10. INSIDE JOKES
   ------------------------------------------------------------- */
.joke-grid {
  margin-top: 3.5rem;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}

.joke-card {
  text-align: left;
  background: var(--color-paper);
  border-radius: var(--radius);
  padding: 1.6rem 1.8rem;
  box-shadow: var(--shadow-card);
  border-left: 3px solid var(--color-sage);
  transition: box-shadow var(--t-fast) var(--ease-soft);
}

.joke-card:hover {
  box-shadow: var(--shadow-soft);
}

.joke-card__teaser {
  display: block;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-ink);
}

.joke-card__full {
  display: block;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  color: var(--color-ink-soft);
  font-size: 0.95rem;
  transition: max-height 0.5s var(--ease-soft), opacity 0.4s ease, margin-top 0.5s var(--ease-soft);
}

.joke-card.is-open .joke-card__full {
  max-height: 240px;
  opacity: 1;
  margin-top: 0.8rem;
}

.joke-card.is-open .joke-card__teaser {
  color: var(--color-rose-deep);
}


/* -------------------------------------------------------------
   11. SURPRISE SECTION
   ------------------------------------------------------------- */
.surprise__btn {
  margin-top: 2rem;
}

.surprise__reveal {
  margin-top: 2.4rem;
  max-width: 520px;
  padding: 2rem;
  background: var(--color-paper);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  font-family: var(--font-script);
  font-size: 1.3rem;
  color: var(--color-rose-deep);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding-top: 0;
  padding-bottom: 0;
  transition: max-height 0.8s var(--ease-soft), opacity 0.6s ease, padding 0.8s var(--ease-soft), margin 0.6s var(--ease-soft);
}

.surprise__reveal.is-visible {
  max-height: 400px;
  opacity: 1;
  padding: 2rem;
  margin-top: 2.4rem;
}


/* -------------------------------------------------------------
   12. FINALE
   ------------------------------------------------------------- */
.finale {
  padding-bottom: 9rem;
}

.finale__photo {
  margin: 0 0 2.2rem;
  width: min(340px, 70vw);
  padding: 0.8rem;
  background: var(--color-paper);
  box-shadow: var(--shadow-soft);
  transform: rotate(-2deg);
}

.finale__photo img {
  width: 100%;
  aspect-ratio: 4 / 5;
  object-fit: cover;
  background: var(--color-blush);
}

.finale__message {
  max-width: 560px;
  margin-top: 1.6rem;
  font-size: 1.15rem;
  color: var(--color-ink-soft);
}

.finale__future {
  max-width: 500px;
  margin-top: 1.2rem;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--color-rose-deep);
}

.finale__signature {
  margin-top: 2.4rem;
  font-family: var(--font-script);
  font-size: 1.6rem;
  color: var(--color-ink);
}

.finale__decor {
  margin-top: 3rem;
  display: flex;
  gap: 0.6rem;
}

.finale__decor span {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-rose);
  opacity: 0.5;
}

.finale__decor span:nth-child(2) {
  background: var(--color-gold);
}

.finale__decor span:nth-child(3) {
  background: var(--color-sage);
}


/* -------------------------------------------------------------
   13. MUSIC BUTTON
   ------------------------------------------------------------- */
.music-btn {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  z-index: 40;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-paper);
  box-shadow: var(--shadow-card);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-rose-deep);
  font-size: 1.1rem;
  transition: transform var(--t-fast) var(--ease-soft), box-shadow var(--t-fast) var(--ease-soft);
}

.music-btn:hover {
  transform: scale(1.06);
  box-shadow: var(--shadow-soft);
}

.music-btn__disc {
  position: absolute;
  inset: 6px;
  border-radius: 50%;
  border: 1px dashed var(--color-blush);
}

.music-btn.is-playing .music-btn__disc {
  animation: spinDisc 6s linear infinite;
}

@keyframes spinDisc {
  to { transform: rotate(360deg); }
}


/* -------------------------------------------------------------
   14. SCROLL-REVEAL ANIMATION SYSTEM
   Elements with class "scroll-reveal" fade + rise into view
   the first time they enter the viewport (handled in script.js
   via IntersectionObserver, which adds the "is-visible" class).
   ------------------------------------------------------------- */
.scroll-reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s var(--ease-soft), transform 0.9s var(--ease-soft);
}

.scroll-reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children inside the same section slightly */
.timeline__item.scroll-reveal { transition-delay: 0.05s; }
.polaroid.scroll-reveal:nth-child(2) { transition-delay: 0.08s; }
.polaroid.scroll-reveal:nth-child(3) { transition-delay: 0.16s; }
.polaroid.scroll-reveal:nth-child(5) { transition-delay: 0.08s; }
.polaroid.scroll-reveal:nth-child(6) { transition-delay: 0.16s; }
.love-card.scroll-reveal:nth-child(2) { transition-delay: 0.08s; }
.love-card.scroll-reveal:nth-child(3) { transition-delay: 0.16s; }
.love-card.scroll-reveal:nth-child(5) { transition-delay: 0.08s; }
.love-card.scroll-reveal:nth-child(6) { transition-delay: 0.16s; }


/* -------------------------------------------------------------
   15. RESPONSIVE — tablet & mobile
   ------------------------------------------------------------- */
@media (max-width: 860px) {
  .chapter {
    padding: 5rem 1.3rem;
  }

  .polaroid-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem 1.4rem;
  }

  .love-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .joke-grid {
    grid-template-columns: 1fr;
  }

  /* Timeline collapses to a single left-aligned column on mobile */
  .timeline__thread {
    left: 10px;
  }

  .timeline__item,
  .timeline__item--right {
    width: 100%;
    align-self: auto;
    padding-left: 2.4rem;
  }

  .timeline__item:not(.timeline__item--right) .timeline__dot,
  .timeline__item--right .timeline__dot {
    left: 4px;
    right: auto;
  }
}

@media (max-width: 560px) {
  .hero__title {
    font-size: clamp(2.4rem, 12vw, 3.2rem);
  }

  .polaroid-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.6rem 1rem;
  }

  .love-grid {
    grid-template-columns: 1fr;
  }

  .love-card {
    height: 160px;
  }

  .envelope {
    height: 230px;
  }

  .envelope__letter {
    font-size: 1.1rem;
    padding: 1.4rem 1.2rem;
  }

  .music-btn {
    width: 46px;
    height: 46px;
    right: 1rem;
    bottom: 1rem;
  }

  .chapter__title {
    font-size: clamp(1.9rem, 8vw, 2.6rem);
  }
}

@media (max-width: 400px) {
  .polaroid-grid {
    grid-template-columns: 1fr;
    max-width: 280px;
    margin-left: auto;
    margin-right: auto;
  }
}