/* ╔══════════════════════════════════════════════════════════════╗
   ║  Birthday Surprise — Production Stylesheet                  ║
   ║  Design: Midnight blue + warm gold + cream                  ║
   ║  Quality: Apple-level polish, cinematic, dreamy              ║
   ╚══════════════════════════════════════════════════════════════╝ */


/* ═══════════════════════════════════════════════════════════════
   §1  CSS CUSTOM PROPERTIES (Design Tokens)
   ═══════════════════════════════════════════════════════════════ */

:root {
  /* ── Colors ── */
  --midnight:    #0a0e27;
  --deep-blue:   #0f1538;
  --gold:        #d4a574;
  --gold-light:  #e8c9a0;
  --gold-dark:   #b8895a;
  --cream:       #faf3e8;
  --cream-dark:  #f0e6d6;
  --soft-purple: #7c6f9c;
  --rose:        #c17c74;
  --dark-text:   #1a1a2e;
  --light-text:  #e8e0d4;

  /* ── Derived / Utility Colors ── */
  --overlay:        rgba(10, 14, 39, 0.85);
  --overlay-heavy:  rgba(10, 14, 39, 0.92);
  --glass:          rgba(255, 255, 255, 0.06);
  --glass-border:   rgba(255, 255, 255, 0.1);
  --shadow-sm:      0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md:      0 8px 32px rgba(0, 0, 0, 0.2);
  --shadow-lg:      0 16px 48px rgba(0, 0, 0, 0.3);
  --shadow-gold:    0 4px 24px rgba(212, 165, 116, 0.25);

  /* ── Typography ── */
  --font-heading:  'Playfair Display', 'Georgia', 'Times New Roman', serif;
  --font-chinese:  'Noto Serif SC', 'Songti SC', 'SimSun', 'STSong', serif;
  --font-body:     'Inter', -apple-system, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;

  /* ── Spacing ── */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  6rem;
  --space-2xl: 10rem;

  /* ── Timing ── */
  --ease-out-expo:   cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-quart:  cubic-bezier(0.25, 1, 0.5, 1);
  --ease-in-out:     cubic-bezier(0.4, 0, 0.2, 1);
  --duration-fast:   0.2s;
  --duration-normal: 0.4s;
  --duration-slow:   0.6s;
  --duration-slower:  0.8s;
  --duration-cinematic: 1.2s;

  /* ── Layout ── */
  --max-width:   1200px;
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 20px;
  --border-radius-full: 9999px;
}


/* ═══════════════════════════════════════════════════════════════
   §2  GLOBAL RESETS & BASE STYLES
   ═══════════════════════════════════════════════════════════════ */

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--light-text);
  background-color: var(--midnight);
  overflow-x: hidden;
  min-height: 100vh;
}

body.opening-active {
  overflow: hidden;
  height: 100vh;
}

/* ── Selection ── */
::selection {
  background-color: var(--gold);
  color: var(--dark-text);
}

::-moz-selection {
  background-color: var(--gold);
  color: var(--dark-text);
}

/* ── Scrollbar ── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--midnight);
}

::-webkit-scrollbar-thumb {
  background: rgba(212, 165, 116, 0.3);
  border-radius: var(--border-radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(212, 165, 116, 0.5);
}

/* Firefox scrollbar */
html {
  scrollbar-width: thin;
  scrollbar-color: rgba(212, 165, 116, 0.3) var(--midnight);
}

/* ── Base Elements ── */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

a {
  color: var(--gold);
  text-decoration: none;
  transition: color var(--duration-fast) ease;
}

a:hover {
  color: var(--gold-light);
}

a:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

canvas {
  display: block;
}

/* ── Utility: No Scroll ── */
body.no-scroll {
  overflow: hidden;
}


/* ═══════════════════════════════════════════════════════════════
   §3  SECTION BASE — Shared section styles
   ═══════════════════════════════════════════════════════════════ */

.section {
  position: relative;
  min-height: 100vh;
  width: 100%;
  overflow: hidden;
}

.section--hidden {
  display: none;
}

.section__header {
  text-align: center;
  padding: var(--space-xl) var(--space-md) var(--space-lg);
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__number {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  opacity: 0.7;
  margin-bottom: var(--space-sm);
}

.section__title {
  font-family: var(--font-chinese);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--space-sm);
  color: var(--dark-text);
}

.section__subtitle {
  font-family: var(--font-chinese);
  font-size: clamp(0.9rem, 2vw, 1.1rem);
  font-weight: 400;
  opacity: 0.65;
  color: var(--dark-text);
}

/* Light header variant (for dark backgrounds) */
.section__header--light .section__title {
  color: var(--cream);
}

.section__header--light .section__subtitle {
  color: var(--light-text);
}


/* ═══════════════════════════════════════════════════════════════
   §4  PROGRESS BAR
   ═══════════════════════════════════════════════════════════════ */

.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold), var(--gold-light));
  z-index: 9999;
  transition: width 0.15s ease-out;
  will-change: width;
  box-shadow: 0 0 8px rgba(212, 165, 116, 0.4);
}


/* ═══════════════════════════════════════════════════════════════
   §5  MUSIC TOGGLE
   ═══════════════════════════════════════════════════════════════ */

.music-toggle {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 48px;
  height: 48px;
  border-radius: var(--border-radius-full);
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9998;
  transition: background var(--duration-normal) ease,
              transform var(--duration-fast) ease,
              box-shadow var(--duration-normal) ease;
  cursor: pointer;
}

.music-toggle:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: scale(1.08);
  box-shadow: 0 4px 16px rgba(212, 165, 116, 0.2);
}

.music-toggle:active {
  transform: scale(0.95);
}

.music-toggle:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.music-icon {
  font-size: 1.25rem;
  line-height: 1;
}

/* ── Music Bars (replaces icon when playing) ── */
.music-bars {
  display: none;
  align-items: flex-end;
  gap: 2px;
  height: 16px;
}

.music-toggle.playing .music-icon {
  display: none;
}

.music-toggle.playing .music-bars {
  display: flex;
}

.music-bars i {
  display: block;
  width: 3px;
  height: 4px;
  background: var(--gold);
  border-radius: 1px;
  animation: musicBar 0.8s ease-in-out infinite alternate;
}

.music-bars i:nth-child(1) {
  animation-delay: 0s;
  height: 6px;
}

.music-bars i:nth-child(2) {
  animation-delay: 0.15s;
  height: 10px;
}

.music-bars i:nth-child(3) {
  animation-delay: 0.3s;
  height: 14px;
}

.music-bars i:nth-child(4) {
  animation-delay: 0.45s;
  height: 8px;
}


/* ═══════════════════════════════════════════════════════════════
   §6  SECTION NAVIGATION (Side Dots)
   ═══════════════════════════════════════════════════════════════ */

.section-nav {
  position: fixed;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 9997;
}

.section-nav button {
  width: 8px;
  height: 8px;
  border-radius: var(--border-radius-full);
  background: rgba(255, 255, 255, 0.25);
  border: none;
  padding: 0;
  cursor: pointer;
  transition: width var(--duration-normal) var(--ease-out-expo),
              background var(--duration-normal) ease,
              box-shadow var(--duration-normal) ease;
}

.section-nav button:hover {
  background: rgba(255, 255, 255, 0.5);
}

.section-nav button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.section-nav button.active {
  width: 24px;
  background: var(--gold);
  box-shadow: 0 0 8px rgba(212, 165, 116, 0.4);
}


/* ═══════════════════════════════════════════════════════════════
   §7  OPENING SECTION — Envelope Animation
   ═══════════════════════════════════════════════════════════════ */

.opening {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(170deg, var(--midnight) 0%, var(--deep-blue) 50%, #0d1230 100%);
}

.opening__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.opening__content {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-md);
  transition: opacity var(--duration-cinematic) var(--ease-out-quart),
              transform var(--duration-cinematic) var(--ease-out-quart);
}

/* Exit transition when leaving opening */
.opening.section-exit .opening__content {
  opacity: 0;
  transform: scale(1.05) translateY(-20px);
}

/* ── Pre-title ── */
.opening__pre-title {
  font-family: var(--font-chinese);
  font-size: clamp(0.875rem, 2vw, 1.1rem);
  color: var(--light-text);
  letter-spacing: 0.15em;
  margin-bottom: var(--space-lg);
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 0.3s forwards;
}

/* ── Envelope ── */
.envelope {
  position: relative;
  width: clamp(240px, 50vw, 320px);
  height: clamp(160px, 33vw, 200px);
  margin-bottom: var(--space-lg);
  cursor: pointer;
  perspective: 800px;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 0.6s forwards;
}

/* Envelope body */
.envelope__body {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(145deg, var(--cream) 0%, var(--cream-dark) 100%);
  border-radius: 4px 4px var(--border-radius-sm) var(--border-radius-sm);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  z-index: 2;
}

/* Envelope body inner border decoration */
.envelope__body::after {
  content: '';
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(212, 165, 116, 0.2);
  border-radius: 2px;
  pointer-events: none;
}

/* Envelope flap (triangle) */
.envelope__flap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 50%;
  z-index: 3;
  transform-origin: top center;
  transition: transform var(--duration-slower) var(--ease-out-expo);
}

.envelope__flap::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-left: clamp(120px, 25vw, 160px) solid transparent;
  border-right: clamp(120px, 25vw, 160px) solid transparent;
  border-top: clamp(80px, 16.5vw, 100px) solid var(--cream-dark);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.08));
}

/* Gold seal on flap */
.envelope__flap::after {
  content: '✦';
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gold);
  color: var(--cream);
  border-radius: var(--border-radius-full);
  font-size: 0.7rem;
  box-shadow: 0 2px 8px rgba(212, 165, 116, 0.4);
  z-index: 4;
  transition: opacity var(--duration-normal) ease;
}

/* Flap opened state */
.envelope.opened .envelope__flap {
  transform: rotateX(-180deg);
}

.envelope.opened .envelope__flap::after {
  opacity: 0;
}

/* ── Letter (slides out) ── */
.envelope__letter {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 85%;
  height: 70%;
  background: white;
  border-radius: var(--border-radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 -2px 12px rgba(0, 0, 0, 0.05);
  transition: transform var(--duration-slower) var(--ease-out-expo) 0.2s;
  z-index: 1;
}

.envelope.opened .envelope__letter {
  transform: translateX(-50%) translateY(-75%);
}

.envelope__letter-text {
  font-family: var(--font-chinese);
  font-size: clamp(0.8rem, 2vw, 1rem);
  color: var(--dark-text);
  letter-spacing: 0.1em;
  opacity: 0;
  transition: opacity var(--duration-slow) ease 0.5s;
}

.envelope.opened .envelope__letter-text {
  opacity: 1;
}

/* ── Envelope Shadow ── */
.envelope__shadow {
  position: absolute;
  bottom: -12px;
  left: 10%;
  width: 80%;
  height: 20px;
  background: radial-gradient(ellipse, rgba(0, 0, 0, 0.2) 0%, transparent 70%);
  filter: blur(4px);
  z-index: 0;
}

/* ── Opening Subtitle ── */
.opening__subtitle {
  font-family: var(--font-chinese);
  font-size: clamp(0.8rem, 1.8vw, 0.95rem);
  color: var(--light-text);
  opacity: 0;
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
  animation: fadeUp 1s var(--ease-out-expo) 0.9s forwards;
}

/* ── Opening Button ── */
.opening__btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-chinese);
  font-size: 0.95rem;
  color: var(--gold);
  border: 1px solid var(--gold);
  border-radius: var(--border-radius-full);
  padding: 0.75rem 2rem;
  letter-spacing: 0.1em;
  background: transparent;
  transition: background var(--duration-normal) ease,
              color var(--duration-normal) ease,
              transform var(--duration-fast) ease,
              box-shadow var(--duration-normal) ease;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) 1.2s forwards;
}

.opening__btn:hover {
  background: var(--gold);
  color: var(--dark-text);
  box-shadow: var(--shadow-gold);
  transform: translateY(-2px);
}

.opening__btn:active {
  transform: translateY(0);
}

.opening__btn:focus-visible {
  outline: 2px solid var(--gold-light);
  outline-offset: 3px;
}

.opening__btn svg {
  transition: transform var(--duration-normal) ease;
}

.opening__btn:hover svg {
  transform: translateX(4px);
}


/* ═══════════════════════════════════════════════════════════════
   §8  HERO SECTION — Main Birthday Visual
   ═══════════════════════════════════════════════════════════════ */

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(180deg, var(--midnight) 0%, var(--deep-blue) 60%, #0d1230 100%);
}

.hero__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-md);
}

/* ── Hero Title ── */
.hero__title {
  margin-bottom: var(--space-md);
}

.hero__title-line1 {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 400;
  font-style: italic;
  color: var(--cream);
  line-height: 1.15;
  letter-spacing: -0.01em;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-cinematic) var(--ease-out-expo),
              transform var(--duration-cinematic) var(--ease-out-expo);
}

.hero__title-line2 {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 700;
  color: var(--gold);
  line-height: 1.15;
  letter-spacing: -0.02em;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--duration-cinematic) var(--ease-out-expo) 0.15s,
              transform var(--duration-cinematic) var(--ease-out-expo) 0.15s;
}

/* ── Hero Subtitle ── */
.hero__subtitle {
  font-family: var(--font-chinese);
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--cream);
  letter-spacing: 0.2em;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-cinematic) var(--ease-out-expo) 0.3s,
              transform var(--duration-cinematic) var(--ease-out-expo) 0.3s;
  margin-bottom: var(--space-lg);
}

/* ── Hero CTA ── */
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-chinese);
  font-size: 0.95rem;
  color: var(--light-text);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: var(--border-radius-full);
  padding: 0.75rem 2rem;
  letter-spacing: 0.08em;
  background: transparent;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-cinematic) var(--ease-out-expo) 0.45s,
              transform var(--duration-cinematic) var(--ease-out-expo) 0.45s,
              background var(--duration-normal) ease,
              color var(--duration-normal) ease,
              border-color var(--duration-normal) ease,
              box-shadow var(--duration-normal) ease;
}

.hero__cta:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--gold);
  color: var(--gold);
  box-shadow: 0 4px 20px rgba(212, 165, 116, 0.15);
}

.hero__cta:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.hero__cta svg {
  transition: transform var(--duration-normal) ease;
}

.hero__cta:hover svg {
  transform: translateY(3px);
}

/* ── Hero Visible State (entrance animation) ── */
.hero.visible .hero__title-line1,
.hero.visible .hero__title-line2,
.hero.visible .hero__subtitle,
.hero.visible .hero__cta {
  opacity: 1;
  transform: translateY(0);
}

/* ── Scroll Hint ── */
.hero__scroll-hint {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transition: opacity var(--duration-slow) ease 1s;
  z-index: 1;
}

.hero.visible .hero__scroll-hint {
  opacity: 0.5;
}

.hero__scroll-hint span {
  font-family: var(--font-chinese);
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--light-text);
}

.hero__scroll-arrow {
  width: 20px;
  height: 20px;
  border-right: 1.5px solid var(--light-text);
  border-bottom: 1.5px solid var(--light-text);
  transform: rotate(45deg);
  animation: bounce 2s ease-in-out infinite;
}


/* ═══════════════════════════════════════════════════════════════
   §9  TIMELINE SECTION — Memory Timeline
   ═══════════════════════════════════════════════════════════════ */

.timeline {
  background: var(--cream);
  color: var(--dark-text);
  padding-bottom: var(--space-xl);
}

.timeline__track {
  position: relative;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ── Central Vertical Line ── */
.timeline__line {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(
    to bottom,
    transparent 0%,
    rgba(212, 165, 116, 0.4) 10%,
    rgba(212, 165, 116, 0.4) 90%,
    transparent 100%
  );
  transform: translateX(-50%);
}

/* ── Timeline Items Container ── */
.timeline__items {
  position: relative;
  z-index: 1;
}

/* ── Individual Timeline Item ── */
.timeline__item {
  position: relative;
  width: 50%;
  padding: var(--space-md);
  opacity: 0;
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

/* Odd items: left side */
.timeline__item:nth-child(odd) {
  padding-right: var(--space-lg);
  text-align: right;
  transform: translateX(-30px);
}

/* Even items: right side */
.timeline__item:nth-child(even) {
  margin-left: 50%;
  padding-left: var(--space-lg);
  text-align: left;
  transform: translateX(30px);
}

/* Visible state */
.timeline__item.visible {
  opacity: 1;
  transform: translateX(0);
}

/* ── Circle Marker on the Line ── */
.timeline__item::before {
  content: '';
  position: absolute;
  top: var(--space-md);
  width: 14px;
  height: 14px;
  border-radius: var(--border-radius-full);
  background: var(--gold);
  border: 3px solid var(--cream);
  box-shadow: 0 0 0 3px var(--gold), var(--shadow-sm);
  z-index: 2;
  transition: transform var(--duration-normal) ease, box-shadow var(--duration-normal) ease;
}

.timeline__item:nth-child(odd)::before {
  right: -7px;
}

.timeline__item:nth-child(even)::before {
  left: -7px;
}

.timeline__item:hover::before {
  transform: scale(1.2);
  box-shadow: 0 0 0 3px var(--gold), 0 0 12px rgba(212, 165, 116, 0.4);
}

/* ── Timeline Card ── */
.timeline__card {
  background: white;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
  cursor: pointer;
  user-select: none;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) ease;
}

.timeline__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

/* ── Timeline Image ── */
.timeline__image {
  position: relative;
  width: 100%;
  padding-top: 56.25%; /* 16:9 aspect ratio */
  overflow: hidden;
}

.timeline__image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Placeholder gradient when no image */
.timeline__image--placeholder {
  background: linear-gradient(135deg, var(--soft-purple), var(--gold));
  opacity: 0.3;
}

/* ── Timeline Card Content ── */
.timeline__content {
  padding: 1.25rem 1.5rem;
}

.timeline__date {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold-dark);
  background: rgba(212, 165, 116, 0.1);
  padding: 0.25rem 0.75rem;
  border-radius: var(--border-radius-full);
  margin-bottom: 0.75rem;
}

.timeline__item-title {
  font-family: var(--font-chinese);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--dark-text);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.timeline__text {
  font-family: var(--font-chinese);
  font-size: 0.9rem;
  line-height: 1.8;
  color: #4a4a5a;
  text-align: left;
}


/* ═══════════════════════════════════════════════════════════════
   §10  GALLERY SECTION — Photo Wall
   ═══════════════════════════════════════════════════════════════ */

.gallery {
  background: linear-gradient(180deg, var(--midnight) 0%, var(--deep-blue) 100%);
  padding-bottom: var(--space-xl);
}

.gallery .section__header .section__title {
  color: var(--cream);
}

.gallery .section__header .section__subtitle {
  color: var(--light-text);
}

/* ── Photo Grid ── */
.gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* Make some photos span 2 columns for irregular layout */
.gallery__photo:nth-child(1) { grid-column: span 1; }
.gallery__photo:nth-child(2) { grid-column: span 1; }
.gallery__photo:nth-child(3) { grid-column: span 1; }
.gallery__photo:nth-child(4) { grid-column: span 2; }
.gallery__photo:nth-child(5) { grid-column: span 1; }
.gallery__photo:nth-child(6) { grid-column: span 1; }
.gallery__photo:nth-child(7) { grid-column: span 1; }
.gallery__photo:nth-child(8) { grid-column: span 1; }
.gallery__photo:nth-child(9) { grid-column: span 2; }

/* ── Individual Photo (Polaroid Style) ── */
.gallery__photo {
  position: relative;
  background: white;
  padding: 10px 10px 40px 10px;
  border-radius: 3px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  cursor: pointer;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) ease;
  opacity: 0;
  transform: translateY(30px);
}

.gallery__photo.visible {
  opacity: 1;
  transform: translateY(0) rotate(var(--rotate, 0deg));
}

.gallery__photo:hover {
  transform: translateY(-8px) rotate(0deg) !important;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35),
              0 0 30px rgba(212, 165, 116, 0.1);
  z-index: 10;
}

.gallery__photo:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

/* ── Photo Image Area ── */
.gallery__image {
  position: relative;
  width: 100%;
  padding-top: 75%; /* 4:3 default aspect ratio */
  overflow: hidden;
  border-radius: 2px;
}

.gallery__image img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.gallery__photo:hover .gallery__image img {
  transform: scale(1.05);
}

/* Unique placeholder gradients for each photo */
.gallery__image--placeholder {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.gallery__photo:nth-child(1) .gallery__image--placeholder { background: linear-gradient(135deg, #e8c9a0, #f5deb3, #deb887); }
.gallery__photo:nth-child(2) .gallery__image--placeholder { background: linear-gradient(135deg, #b8c6db, #a8b8d0, #9cafc4); }
.gallery__photo:nth-child(3) .gallery__image--placeholder { background: linear-gradient(135deg, #f5c6c0, #e8afa6, #d4978e); }
.gallery__photo:nth-child(4) .gallery__image--placeholder { background: linear-gradient(135deg, #c8d8c0, #b0c8a0, #98b888); }
.gallery__photo:nth-child(5) .gallery__image--placeholder { background: linear-gradient(135deg, #d8c4e0, #c8b0d4, #b89cc8); }
.gallery__photo:nth-child(6) .gallery__image--placeholder { background: linear-gradient(135deg, #f0d8c0, #e8c8a8, #d4b890); }
.gallery__photo:nth-child(7) .gallery__image--placeholder { background: linear-gradient(135deg, #c4d8e8, #b0c8dc, #9cb8d0); }
.gallery__photo:nth-child(8) .gallery__image--placeholder { background: linear-gradient(135deg, #e8d0d8, #dcc0c8, #d0b0b8); }
.gallery__photo:nth-child(9) .gallery__image--placeholder { background: linear-gradient(135deg, #d0d8c0, #c8d0b0, #bcc8a0); }

/* ── Photo Caption ── */
.gallery__caption {
  position: absolute;
  bottom: 10px;
  left: 10px;
  right: 10px;
  text-align: center;
  font-family: var(--font-chinese);
  font-size: 0.8rem;
  color: #666;
  line-height: 1.4;
  padding-top: 8px;
}


/* ═══════════════════════════════════════════════════════════════
   §11  LIGHTBOX — Full-screen Photo Viewer
   ═══════════════════════════════════════════════════════════════ */

.lightbox {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  background: var(--overlay-heavy);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) ease,
              visibility var(--duration-normal) ease;
}

.lightbox[hidden] {
  display: flex;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.lightbox:not([hidden]) {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.lightbox__content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  max-width: 90vw;
  max-height: 85vh;
}

.lightbox__image-wrap {
  max-width: 90vw;
  max-height: 75vh;
  overflow: hidden;
  border-radius: var(--border-radius-md);
}

.lightbox__image {
  max-width: 100%;
  max-height: 75vh;
  border-radius: var(--border-radius-md);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.lightbox__image img {
  max-width: 90vw;
  max-height: 75vh;
  object-fit: contain;
  border-radius: var(--border-radius-md);
}

.lightbox__caption {
  font-family: var(--font-chinese);
  font-size: 1rem;
  color: var(--cream);
  text-align: center;
  letter-spacing: 0.05em;
  opacity: 0.8;
}

/* ── Lightbox Controls ── */
.lightbox__close {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  color: var(--cream);
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--border-radius-full);
  transition: background var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.lightbox__close:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.1);
}

.lightbox__close:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.lightbox__prev,
.lightbox__next {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--cream);
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--border-radius-full);
  transition: background var(--duration-fast) ease, transform var(--duration-fast) ease;
}

.lightbox__prev {
  left: 1.5rem;
}

.lightbox__next {
  right: 1.5rem;
}

.lightbox__prev:hover,
.lightbox__next:hover {
  background: rgba(255, 255, 255, 0.18);
}

.lightbox__prev:active,
.lightbox__next:active {
  transform: translateY(-50%) scale(0.92);
}

.lightbox__prev:focus-visible,
.lightbox__next:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}


/* ═══════════════════════════════════════════════════════════════
   §12  LETTERS SECTION — Unsaid Words
   ═══════════════════════════════════════════════════════════════ */

.letters {
  background: linear-gradient(170deg, var(--deep-blue) 0%, #161040 40%, var(--midnight) 100%);
  padding-bottom: var(--space-xl);
}

.letters .section__header .section__title {
  color: var(--cream);
}

.letters .section__header .section__subtitle {
  color: var(--light-text);
}

/* ── Letters Grid ── */
.letters__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ── Letter Envelope ── */
.letter-envelope {
  position: relative;
  width: 240px;
  height: 160px;
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.letter-envelope.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Envelope body shape */
.letter-envelope__body {
  position: relative;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(250, 243, 232, 0.08) 0%, rgba(250, 243, 232, 0.04) 100%);
  border: 1px solid rgba(212, 165, 116, 0.2);
  border-radius: var(--border-radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  transition: transform var(--duration-normal) var(--ease-out-expo),
              box-shadow var(--duration-normal) ease,
              border-color var(--duration-normal) ease;
}

.letter-envelope:hover .letter-envelope__body {
  transform: translateY(-6px);
  box-shadow: 0 12px 32px rgba(212, 165, 116, 0.12);
  border-color: rgba(212, 165, 116, 0.4);
}

.letter-envelope:focus-visible .letter-envelope__body {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* Wax seal circle */
.letter-envelope__seal {
  width: 44px;
  height: 44px;
  border-radius: var(--border-radius-full);
  background: linear-gradient(135deg, var(--gold), var(--gold-dark));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(212, 165, 116, 0.3);
  transition: transform var(--duration-normal) ease;
}

.letter-envelope:hover .letter-envelope__seal {
  transform: scale(1.1);
}

/* Envelope label */
.letter-envelope__label {
  font-family: var(--font-chinese);
  font-size: 0.85rem;
  color: var(--light-text);
  letter-spacing: 0.05em;
  text-align: center;
  padding: 0 var(--space-sm);
}


/* ═══════════════════════════════════════════════════════════════
   §13  LETTER MODAL — Reading View
   ═══════════════════════════════════════════════════════════════ */

.letter-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) ease,
              visibility var(--duration-normal) ease;
}

.letter-modal[hidden] {
  display: flex;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.letter-modal:not([hidden]) {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.letter-modal__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay-heavy);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.letter-modal__paper {
  position: relative;
  max-width: 560px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  background: var(--cream);
  border-radius: var(--border-radius-lg);
  padding: var(--space-lg) var(--space-md);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
  transform: scale(0.8);
  transition: transform var(--duration-slow) var(--ease-out-expo);
}

.letter-modal:not([hidden]) .letter-modal__paper {
  transform: scale(1);
}

/* Paper texture overlay */
.letter-modal__paper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23d4a574' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
  border-radius: var(--border-radius-lg);
}

.letter-modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--dark-text);
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--border-radius-full);
  transition: background var(--duration-fast) ease;
  z-index: 2;
}

.letter-modal__close:hover {
  background: rgba(0, 0, 0, 0.1);
}

.letter-modal__close:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.letter-modal__title {
  font-family: var(--font-chinese);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--dark-text);
  text-align: center;
  margin-bottom: var(--space-md);
  position: relative;
  z-index: 1;
}

.letter-modal__content {
  font-family: var(--font-chinese);
  font-size: 1rem;
  line-height: 2;
  color: #3a3a4a;
  white-space: pre-line;
  position: relative;
  z-index: 1;
}


/* ═══════════════════════════════════════════════════════════════
   §13.5  STORY MODAL (Timeline Memory Detail)
   ═══════════════════════════════════════════════════════════════ */

.story-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) ease,
              visibility var(--duration-normal) ease;
}

.story-modal[hidden] {
  display: flex;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.story-modal:not([hidden]) {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.story-modal__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay-heavy);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.story-modal__card {
  position: relative;
  max-width: 620px;
  width: 92%;
  max-height: 85vh;
  overflow-y: auto;
  background: var(--cream);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.45);
  transform: scale(0.9);
  transition: transform var(--duration-slow) var(--ease-out-expo);
  z-index: 1;
  color: var(--dark-text);
}

.story-modal:not([hidden]) .story-modal__card {
  transform: scale(1);
}

.story-modal__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--dark-text);
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--border-radius-full);
  transition: background var(--duration-fast) ease, transform 0.2s ease;
  z-index: 10;
  cursor: pointer;
}

.story-modal__close:hover {
  background: white;
  transform: scale(1.08);
}

.story-modal__image-wrap {
  width: 100%;
  height: 220px;
  position: relative;
  overflow: hidden;
  border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.story-modal__image-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.story-modal__body {
  padding: 1.75rem 2rem 2rem;
}

.story-modal__date {
  display: inline-block;
  font-size: 0.825rem;
  letter-spacing: 2px;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.story-modal__title {
  font-family: var(--font-heading);
  font-size: 1.65rem;
  font-weight: 700;
  color: var(--dark-text);
  margin-bottom: 1rem;
  line-height: 1.3;
}

.story-modal__text {
  font-size: 1rem;
  line-height: 1.85;
  color: #4a4a58;
  white-space: pre-line;
}

.story-modal__footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.story-modal__like-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: white;
  border: 1px solid rgba(212, 165, 116, 0.4);
  padding: 8px 18px;
  border-radius: var(--border-radius-full);
  font-size: 0.9rem;
  color: var(--dark-text);
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.story-modal__like-btn:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
  box-shadow: 0 4px 16px rgba(212, 165, 116, 0.25);
}

.story-modal__like-btn:active {
  transform: scale(0.96);
}

.story-modal__like-btn.liked .like-heart {
  animation: heartPulse 0.4s ease-out;
}

@keyframes heartPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.4); }
  100% { transform: scale(1); }
}


/* ═══════════════════════════════════════════════════════════════
   §14  CAKE SECTION — Birthday Cake
   ═══════════════════════════════════════════════════════════════ */

.cake-section {
  background: linear-gradient(180deg, var(--cream) 0%, #f5eadb 50%, var(--cream) 100%);
  color: var(--dark-text);
  padding-bottom: var(--space-xl);
}

.cake__stage {
  max-width: 500px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  text-align: center;
}

.cake__wrapper {
  position: relative;
  margin-bottom: var(--space-md);
}

/* ── SVG Cake ── */
.cake__svg {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  display: block;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.08));
}

/* ── Candles Container ── */
.cake__candles {
  position: absolute;
  top: 36%;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 24px;
  justify-content: center;
  align-items: flex-end;
  z-index: 2;
  width: 60%;
  padding-bottom: 10px;
}

/* ── Individual Candle ── */
.candle {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: pointer;
  padding: 8px 4px 0;
  transition: transform 0.2s ease;
}

.candle:hover {
  transform: translateY(-2px);
}

.candle__stick,
.candle__body {
  width: 7px;
  height: 38px;
  border-radius: 3px 3px 1px 1px;
  background: linear-gradient(180deg, #ffe8cc 0%, #ffd4a0 50%, #e8b878 100%);
  position: relative;
}

/* Candle stripe decoration */
.candle__stick::after,
.candle__body::after {
  content: '';
  position: absolute;
  top: 4px;
  left: 1.5px;
  width: 3px;
  height: calc(100% - 8px);
  background: rgba(255, 255, 255, 0.35);
  border-radius: 1px;
}

/* ── Candle Flame ── */
.candle__flame {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 18px;
  background: radial-gradient(ellipse at 50% 90%, #fff6e0 0%, #ffcc44 30%, #ff8800 60%, transparent 100%);
  border-radius: 50% 50% 50% 50% / 70% 70% 40% 40%;
  opacity: 0;
  transform-origin: center bottom;
  transition: opacity var(--duration-normal) ease;
  filter: blur(0.5px);
}

.candle__flame.lit,
.candle.lit .candle__flame {
  opacity: 1;
  animation: flicker 0.8s ease-in-out infinite alternate;
}

.candle__flame.blown,
.candle.blown .candle__flame {
  opacity: 0;
  animation: flameBlow 0.5s ease-out forwards;
}

/* ── Candle Smoke ── */
.candle__smoke {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 4px;
  background: rgba(180, 180, 180, 0.5);
  border-radius: var(--border-radius-full);
  opacity: 0;
  pointer-events: none;
}

.candle__smoke.active,
.candle.blown .candle__smoke {
  animation: smokeRise 1.5s ease-out forwards;
}

/* ── Cake Glow ── */
.cake__glow {
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80%;
  height: 60px;
  background: radial-gradient(ellipse, rgba(255, 200, 100, 0.15) 0%, transparent 70%);
  pointer-events: none;
  transition: opacity var(--duration-slow) ease;
}

.cake__glow.dim {
  opacity: 0.3;
}

/* ── Cake Controls ── */
.cake__controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  margin-bottom: var(--space-md);
}

.cake__btn {
  font-family: var(--font-chinese);
  font-size: 0.95rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--border-radius-full);
  letter-spacing: 0.05em;
  transition: background var(--duration-normal) ease,
              color var(--duration-normal) ease,
              transform var(--duration-fast) ease,
              box-shadow var(--duration-normal) ease;
}

.cake__btn--light {
  background: var(--gold);
  color: white;
  box-shadow: 0 4px 16px rgba(212, 165, 116, 0.3);
}

.cake__btn--light:hover {
  background: var(--gold-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(212, 165, 116, 0.4);
}

.cake__btn--wish {
  background: var(--soft-purple);
  color: white;
  box-shadow: 0 4px 16px rgba(124, 111, 156, 0.3);
}

.cake__btn--wish:hover {
  background: #6b5e8c;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(124, 111, 156, 0.4);
}

.cake__btn--blow {
  background: var(--rose);
  color: white;
  box-shadow: 0 4px 16px rgba(193, 124, 116, 0.3);
}

.cake__btn--blow:hover {
  background: #a86860;
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(193, 124, 116, 0.4);
}

.cake__btn:active {
  transform: translateY(0) scale(0.97);
}

.cake__btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ── Cake Message ── */
.cake__message {
  font-family: var(--font-chinese);
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--dark-text);
  text-align: center;
  letter-spacing: 0.1em;
  opacity: 0;
  animation: fadeUp 0.8s var(--ease-out-expo) forwards;
}

.cake__message[hidden] {
  display: none;
}


/* ═══════════════════════════════════════════════════════════════
   §15  STAR SKY SECTION — Wish Upon a Star
   ═══════════════════════════════════════════════════════════════ */

.starsky {
  background: linear-gradient(180deg, #050818 0%, var(--midnight) 30%, var(--deep-blue) 100%);
  min-height: 100vh;
  padding-bottom: var(--space-xl);
  display: flex;
  flex-direction: column;
}

.starsky__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ── Star Wishes Container ── */
.starsky__wishes {
  position: relative;
  z-index: 1;
  flex: 1;
  min-height: 50vh;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
}

/* ── Individual Star ── */
.star {
  position: absolute;
  border-radius: var(--border-radius-full);
  background: radial-gradient(circle, #fffbe8 0%, rgba(255, 251, 232, 0.6) 40%, transparent 70%);
  cursor: pointer;
  transition: transform var(--duration-normal) ease,
              box-shadow var(--duration-normal) ease;
  animation: twinkle 3s ease-in-out infinite;
}

.star--small {
  width: 6px;
  height: 6px;
}

.star--medium {
  width: 10px;
  height: 10px;
}

.star--large {
  width: 14px;
  height: 14px;
}

.star:hover {
  transform: scale(1.8);
  box-shadow: 0 0 20px rgba(255, 251, 232, 0.6),
              0 0 40px rgba(255, 251, 232, 0.3);
}

.star:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 4px;
}

/* Star revealed: burst + glow */
.star--revealed {
  animation: starBurst 0.6s var(--ease-out-expo) forwards;
}

/* ── Revealed Wish Text Panel ── */
.starsky__revealed {
  position: relative;
  z-index: 2;
  max-width: 480px;
  margin: var(--space-md) auto;
  padding: var(--space-md) var(--space-lg);
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(212, 165, 116, 0.15);
  border-radius: var(--border-radius-lg);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--duration-slow) var(--ease-out-expo),
              transform var(--duration-slow) var(--ease-out-expo);
}

.starsky__revealed[hidden] {
  display: block;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.starsky__revealed:not([hidden]) {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
}

.starsky__wish-text {
  font-family: var(--font-chinese);
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  color: var(--cream);
  letter-spacing: 0.08em;
  line-height: 1.8;
}

/* ── Collect Button ── */
.starsky__collect {
  position: relative;
  z-index: 2;
  display: block;
  margin: var(--space-md) auto 0;
  font-family: var(--font-chinese);
  font-size: 0.9rem;
  color: var(--light-text);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius-full);
  padding: 0.65rem 1.75rem;
  letter-spacing: 0.08em;
  background: transparent;
  transition: background var(--duration-normal) ease,
              color var(--duration-normal) ease,
              border-color var(--duration-normal) ease;
}

.starsky__collect:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: var(--gold);
  color: var(--gold);
}

.starsky__collect:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}


/* ═══════════════════════════════════════════════════════════════
   §16  FINALE SECTION — Final Blessing
   ═══════════════════════════════════════════════════════════════ */

.finale {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(180deg, var(--midnight) 0%, #060a20 50%, var(--midnight) 100%);
}

.finale__canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.finale__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-lg) var(--space-md);
  max-width: 700px;
  width: 100%;
}

/* ── Finale Lines ── */
.finale__lines {
  margin-bottom: var(--space-xl);
}

.finale-line {
  font-family: var(--font-chinese);
  font-size: clamp(1.1rem, 3vw, 1.5rem);
  color: var(--cream);
  line-height: 2;
  letter-spacing: 0.1em;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-cinematic) var(--ease-out-expo),
              transform var(--duration-cinematic) var(--ease-out-expo);
}

.finale-line.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Last meaningful line — bigger and gold ("生日快乐") */
.finale-line:last-child {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--gold);
  margin-top: var(--space-sm);
}

/* Empty line spacer */
.finale-line--empty {
  height: var(--space-sm);
}

/* ── Gift Button ── */
.finale__gift {
  margin-bottom: var(--space-md);
}

.finale__gift[hidden] {
  display: none;
}

.finale__gift-btn {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: var(--space-md);
  cursor: pointer;
  transition: transform var(--duration-normal) ease;
  animation: pulse 2s ease-in-out infinite;
}

.finale__gift-btn:hover {
  animation-play-state: paused;
  transform: scale(1.1);
}

.finale__gift-btn:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 6px;
  border-radius: var(--border-radius-md);
}

.finale__gift-icon {
  font-size: 4rem;
  line-height: 1;
  display: block;
  filter: drop-shadow(0 4px 12px rgba(212, 165, 116, 0.3));
}

.finale__gift-text {
  font-family: var(--font-chinese);
  font-size: 0.9rem;
  color: var(--light-text);
  letter-spacing: 0.08em;
}

/* ── Hidden Message (revealed after gift) ── */
.finale__hidden {
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.finale__hidden[hidden] {
  display: none;
}

.finale__hidden-text {
  font-family: var(--font-chinese);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--cream);
  line-height: 2;
  letter-spacing: 0.06em;
  white-space: pre-line;
  opacity: 0;
  animation: fadeUp 1s var(--ease-out-expo) forwards;
}

/* ── Replay Button ── */
.finale__replay {
  font-family: var(--font-chinese);
  font-size: 0.85rem;
  color: var(--light-text);
  opacity: 0.5;
  letter-spacing: 0.08em;
  padding: 0.75rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--border-radius-full);
  transition: opacity var(--duration-normal) ease,
              border-color var(--duration-normal) ease,
              color var(--duration-normal) ease;
}

.finale__replay[hidden] {
  display: none;
}

.finale__replay:hover {
  opacity: 1;
  border-color: var(--gold);
  color: var(--gold);
}

.finale__replay:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}


/* ═══════════════════════════════════════════════════════════════
   §17  CONFETTI CANVAS — Celebration Overlay
   ═══════════════════════════════════════════════════════════════ */

.confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 9998;
}


/* ═══════════════════════════════════════════════════════════════
   §18  KEYFRAME ANIMATIONS
   ═══════════════════════════════════════════════════════════════ */

/* ── Fade Up — General entrance ── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Fade In — Simple opacity ── */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* ── Flicker — Candle flame ── */
@keyframes flicker {
  0% {
    transform: translateX(-50%) scale(1, 1) rotate(0deg);
    opacity: 1;
  }
  25% {
    transform: translateX(-50%) scale(0.92, 1.08) rotate(-2deg);
    opacity: 0.9;
  }
  50% {
    transform: translateX(-50%) scale(1.05, 0.95) rotate(1deg);
    opacity: 1;
  }
  75% {
    transform: translateX(-50%) scale(0.96, 1.04) rotate(-1deg);
    opacity: 0.85;
  }
  100% {
    transform: translateX(-50%) scale(1.02, 0.98) rotate(2deg);
    opacity: 0.95;
  }
}

/* ── Flame Blow Out ── */
@keyframes flameBlow {
  0% {
    transform: translateX(-50%) scale(1, 1);
    opacity: 1;
  }
  40% {
    transform: translateX(-50%) scale(1.4, 0.6) translateX(6px);
    opacity: 0.7;
  }
  100% {
    transform: translateX(-50%) scale(0.1, 0.1);
    opacity: 0;
  }
}

/* ── Smoke Rise — After blowing candle ── */
@keyframes smokeRise {
  0% {
    opacity: 0.6;
    transform: translateX(-50%) translateY(0) scale(1);
  }
  50% {
    opacity: 0.3;
    transform: translateX(-50%) translateY(-20px) scale(2);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(-40px) scale(3);
  }
}

/* ── Twinkle — Star animation ── */
@keyframes twinkle {
  0% {
    opacity: 0.4;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1.1);
  }
  100% {
    opacity: 0.4;
    transform: scale(0.9);
  }
}

/* ── Star Burst — When star is clicked ── */
@keyframes starBurst {
  0% {
    transform: scale(1);
    box-shadow: 0 0 4px rgba(255, 251, 232, 0.4);
  }
  50% {
    transform: scale(2.5);
    box-shadow: 0 0 30px rgba(255, 251, 232, 0.8),
                0 0 60px rgba(212, 165, 116, 0.4);
  }
  100% {
    transform: scale(1.5);
    box-shadow: 0 0 16px rgba(255, 251, 232, 0.5),
                0 0 32px rgba(212, 165, 116, 0.2);
    background: radial-gradient(circle, var(--gold) 0%, rgba(212, 165, 116, 0.4) 50%, transparent 70%);
  }
}

/* ── Bounce — Scroll hint ── */
@keyframes bounce {
  0%, 20%, 50%, 80%, 100% {
    transform: rotate(45deg) translateY(0);
  }
  40% {
    transform: rotate(45deg) translateY(-8px);
  }
  60% {
    transform: rotate(45deg) translateY(-4px);
  }
}

/* ── Music Bar — Audio visualization ── */
@keyframes musicBar {
  0% {
    height: 4px;
  }
  100% {
    height: 16px;
  }
}

/* ── Float — Gentle floating motion ── */
@keyframes float {
  0% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
  100% {
    transform: translateY(0);
  }
}

/* ── Pulse — Gift button ── */
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.06);
  }
  100% {
    transform: scale(1);
  }
}

/* ── Slide In Left — Timeline cards ── */
@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ── Slide In Right — Timeline cards ── */
@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ── Typewriter — Cake message reveal ── */
@keyframes typewriter {
  from {
    width: 0;
  }
  to {
    width: 100%;
  }
}


/* ═══════════════════════════════════════════════════════════════
   §19  ACCESSIBILITY — prefers-reduced-motion
   ═══════════════════════════════════════════════════════════════ */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.15s !important;
    scroll-behavior: auto !important;
  }

  .hero__title-line1,
  .hero__title-line2,
  .hero__subtitle,
  .hero__cta,
  .opening__pre-title,
  .opening__subtitle,
  .opening__btn,
  .envelope,
  .timeline__item,
  .gallery__photo,
  .letter-envelope,
  .finale-line,
  .starsky__revealed,
  .cake__message {
    opacity: 1 !important;
    transform: none !important;
  }

  .hero__scroll-arrow,
  .finale__gift-btn,
  .star,
  .candle__flame.lit,
  .music-bars i {
    animation: none !important;
  }

  .hero.visible .hero__scroll-hint {
    opacity: 0.5 !important;
  }
}


/* ═══════════════════════════════════════════════════════════════
   §20  RESPONSIVE — Tablet (max-width: 1024px)
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 1024px) {
  /* Section nav closer to edge */
  .section-nav {
    right: 1rem;
  }

  /* Gallery: 2-column layout */
  .gallery__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }

  .gallery__photo:nth-child(n) {
    grid-column: span 1;
  }

  .gallery__photo:nth-child(4) {
    grid-column: span 2;
  }

  .gallery__photo:nth-child(9) {
    grid-column: span 2;
  }

  /* Timeline: single column */
  .timeline__line {
    left: 24px;
  }

  .timeline__item,
  .timeline__item:nth-child(odd),
  .timeline__item:nth-child(even) {
    width: 100%;
    margin-left: 0;
    padding-left: 56px;
    padding-right: var(--space-md);
    text-align: left;
    transform: translateX(30px);
  }

  .timeline__item.visible {
    transform: translateX(0);
  }

  .timeline__item::before,
  .timeline__item:nth-child(odd)::before,
  .timeline__item:nth-child(even)::before {
    left: 17px;
    right: auto;
  }

  /* Letters grid adjustments */
  .letters__grid {
    gap: var(--space-sm);
  }

  .letter-envelope {
    width: 220px;
    height: 150px;
  }
}


/* ═══════════════════════════════════════════════════════════════
   §21  RESPONSIVE — Mobile (max-width: 768px)
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 768px) {
  :root {
    --space-lg: 3rem;
    --space-xl: 4rem;
    --space-2xl: 6rem;
  }

  /* Section nav hide on mobile for cleanliness */
  .section-nav {
    display: none;
  }

  /* Music toggle */
  .music-toggle {
    bottom: 1.25rem;
    right: 1.25rem;
    width: 44px;
    height: 44px;
  }

  /* Section headers */
  .section__header {
    padding: var(--space-lg) var(--space-sm) var(--space-md);
  }

  /* Envelope sizing */
  .envelope {
    width: 260px;
    height: 170px;
  }

  .envelope__flap::before {
    border-left-width: 130px;
    border-right-width: 130px;
    border-top-width: 85px;
  }

  /* Gallery: single column */
  .gallery__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
    padding: 0 var(--space-sm);
  }

  .gallery__photo:nth-child(n) {
    grid-column: span 1;
  }

  .gallery__photo {
    max-width: 380px;
    margin: 0 auto;
  }

  /* Lightbox arrows */
  .lightbox__prev,
  .lightbox__next {
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
  }

  .lightbox__prev {
    left: 0.75rem;
  }

  .lightbox__next {
    right: 0.75rem;
  }

  /* Letters */
  .letters__grid {
    flex-direction: column;
    align-items: center;
  }

  .letter-envelope {
    width: 280px;
    height: 160px;
  }

  /* Letter modal */
  .letter-modal__paper {
    padding: var(--space-md);
    width: 94%;
    max-height: 85vh;
  }

  /* Cake */
  .cake__candles {
    gap: 16px;
  }

  .cake__controls {
    flex-direction: column;
    align-items: center;
  }

  .cake__btn {
    width: 100%;
    max-width: 280px;
    min-height: 44px;
  }

  /* Finale */
  .finale__content {
    padding: var(--space-md) var(--space-sm);
  }

  .finale__gift-icon {
    font-size: 3.5rem;
  }

  /* Star sky */
  .starsky__revealed {
    padding: var(--space-sm) var(--space-md);
    margin: var(--space-sm) var(--space-sm);
  }

  /* All buttons touch-friendly */
  .opening__btn,
  .hero__cta,
  .cake__btn,
  .starsky__collect,
  .finale__replay {
    min-height: 44px;
    padding: 0.75rem 1.5rem;
  }
}


/* ═══════════════════════════════════════════════════════════════
   §22  RESPONSIVE — Small Mobile (max-width: 480px)
   ═══════════════════════════════════════════════════════════════ */

@media (max-width: 480px) {
  :root {
    --space-lg: 2.5rem;
    --space-xl: 3rem;
  }

  body {
    font-size: 15px;
  }

  /* Envelope smaller */
  .envelope {
    width: 220px;
    height: 145px;
  }

  .envelope__flap::before {
    border-left-width: 110px;
    border-right-width: 110px;
    border-top-width: 72.5px;
  }

  /* Hero adjustments */
  .hero__title-line1 {
    font-size: 2rem;
  }

  .hero__title-line2 {
    font-size: 2.5rem;
  }

  /* Timeline */
  .timeline__item,
  .timeline__item:nth-child(odd),
  .timeline__item:nth-child(even) {
    padding-left: 44px;
    padding-right: var(--space-xs);
  }

  .timeline__line {
    left: 16px;
  }

  .timeline__item::before,
  .timeline__item:nth-child(odd)::before,
  .timeline__item:nth-child(even)::before {
    left: 9px;
    width: 12px;
    height: 12px;
  }

  .timeline__content {
    padding: 1rem;
  }

  .timeline__date {
    font-size: 0.7rem;
  }

  .timeline__item-title {
    font-size: 1rem;
  }

  .timeline__text {
    font-size: 0.85rem;
  }

  /* Gallery */
  .gallery__photo {
    padding: 6px 6px 32px 6px;
    max-width: 320px;
  }

  .gallery__caption {
    font-size: 0.75rem;
    bottom: 6px;
    left: 6px;
    right: 6px;
  }

  /* Letter envelope */
  .letter-envelope {
    width: 240px;
    height: 140px;
  }

  .letter-envelope__seal {
    width: 38px;
    height: 38px;
    font-size: 0.95rem;
  }

  .letter-envelope__label {
    font-size: 0.8rem;
  }

  /* Letter modal */
  .letter-modal__paper {
    padding: 1.5rem var(--space-sm);
    border-radius: var(--border-radius-md);
  }

  .letter-modal__title {
    font-size: 1.1rem;
  }

  .letter-modal__content {
    font-size: 0.9rem;
    line-height: 1.9;
  }

  /* Cake */
  .cake__candles {
    gap: 12px;
  }

  .candle__stick {
    height: 28px;
    width: 5px;
  }

  .candle__flame {
    width: 8px;
    height: 13px;
    top: -13px;
  }

  /* Finale */
  .finale-line {
    font-size: 1rem;
    line-height: 1.8;
  }

  .finale-line:last-child {
    font-size: 1.5rem;
  }

  .finale__gift-icon {
    font-size: 3rem;
  }

  .finale__hidden-text {
    font-size: 0.9rem;
  }

  /* Star sky */
  .starsky__wish-text {
    font-size: 0.95rem;
  }
}


/* ═══════════════════════════════════════════════════════════════
   §23  UTILITY CLASSES
   ═══════════════════════════════════════════════════════════════ */

/* Visually hidden but accessible to screen readers */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* Visible entrance trigger */
.visible {
  /* Applied via JS — individual section elements define their own
     opacity/transform transitions above that respond to this class */
}

/* Text alignment helpers */
.text-center { text-align: center; }
.text-left   { text-align: left; }
.text-right  { text-align: right; }

/* Spacing helpers */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }