/* ==========================================================================
   THE STRING THAT LED ME TO YOU — SHAELBY & ARU
   Palette:
   - Cherry Red:  #FF304F (Red string / Primary accent / Buttons / Knots)
   - Midnight:    #10131A (Text / Dark sections / Frame borders)
   - Ice Blue:    #B9E6FF (Secondary accent / Soft pills)
   - Soft White:  #F8F7F2 (Main background canvas)
   - Bubblegum:   #FFB7CA (Highlights / Badges / Washi tape)
   ========================================================================== */

/* Local Rough Notes Font Support */
@font-face {
  font-family: 'Rough Notes';
  src: local('Rough Notes'),
       url('assets/RoughNotes.woff2') format('woff2'),
       url('assets/RoughNotes.woff') format('woff'),
       url('assets/RoughNotes.ttf') format('truetype'),
       url('assets/RoughNotes.otf') format('opentype');
  font-weight: normal;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg-page: #F8F7F2;
  --bg-card: #FFFFFF;
  --bg-surface: #EFECE3;
  --border-card: #E2DDD2;
  --shadow-soft: rgba(16, 19, 26, 0.06);
  
  --ink-primary: #10131A;
  --ink-muted: #4A505C;
  --ink-faded: #8A92A0;
  
  --thread-red: #FF304F;
  --thread-red-light: rgba(255, 48, 79, 0.16);
  --accent-blue: #B9E6FF;
  --accent-blue-light: rgba(185, 230, 255, 0.35);
  --accent-pink: #FFB7CA;
  --accent-pink-light: rgba(255, 183, 202, 0.28);
  
  --washi-tape: rgba(255, 183, 202, 0.55);

  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-hand: 'Rough Notes', 'Nothing You Could Do', 'Reenie Beanie', 'Covered By Your Grace', cursive;

  --ease-fluid: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: all 0.45s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

html {
  background-color: var(--bg-page);
  touch-action: manipulation;
}

body {
  background-color: var(--bg-page);
  color: var(--ink-primary);
  font-family: var(--font-main);
  font-size: 15.5px;
  line-height: 1.6;
  min-height: 100dvh;
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.011em;
}

/* Paper Grain Texture */
.paper-grain {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ==========================================================================
   TOP NAVIGATION BAR
   ========================================================================== */
.top-nav-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  padding: 12px 20px;
  padding-top: max(12px, env(safe-area-inset-top));
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(248, 247, 242, 0.92);
  border-bottom: 1px solid var(--border-card);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav-btn-back {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--ink-primary);
  font-family: var(--font-main);
  font-size: 0.76rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  transition: var(--ease-fluid);
  box-shadow: 0 1px 3px var(--shadow-soft);
}

.nav-btn-back.hidden { display: none; }

.nav-btn-back:hover {
  border-color: var(--thread-red);
  color: var(--thread-red);
}

.brand-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink-muted);
  letter-spacing: -0.01em;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-pill {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  color: var(--ink-muted);
  font-family: var(--font-main);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
  box-shadow: 0 1px 4px var(--shadow-soft);
  transition: var(--ease-fluid);
}

.control-pill:hover {
  color: var(--ink-primary);
  border-color: var(--accent-pink);
}

.pill-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background-color: var(--ink-faded);
}

.control-pill.is-active .pill-dot {
  background-color: var(--thread-red);
}

/* ==========================================================================
   PROGRESSIVE RED THREAD SVG BACKGROUND
   ========================================================================== */
.thread-viewport {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

.master-thread-svg {
  width: 100%;
  height: 100%;
}

.master-thread-path {
  stroke: var(--thread-red);
  stroke-width: 2.3px;
  stroke-linecap: round;
  opacity: 0.88;
  transition: stroke-dashoffset 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================================================
   STEP STAGE & STORY CARDS
   ========================================================================== */
.stage-container {
  position: relative;
  z-index: 2;
  min-height: 100dvh;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 85px 20px 45px 20px;
  max-width: 660px;
  margin: 0 auto;
}

.step-view {
  display: none;
  width: 100%;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.35s cubic-bezier(0.16, 1, 0.3, 1), transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.step-view.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.story-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 8px;
  padding: 40px 30px;
  box-shadow: 0 8px 30px var(--shadow-soft);
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.display-title {
  font-size: clamp(1.75rem, 4.8vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink-primary);
  margin-bottom: 12px;
  line-height: 1.25;
}

.body-prose {
  font-size: 0.98rem;
  color: var(--ink-muted);
  line-height: 1.75;
  max-width: 450px;
  margin-bottom: 20px;
}

.body-sub {
  font-size: 0.9rem;
  color: var(--ink-muted);
  margin-bottom: 20px;
}

/* Action Buttons */
.action-footer {
  margin-top: 30px;
  width: 100%;
  display: flex;
  justify-content: center;
}

.btn-primary {
  background: var(--thread-red);
  color: #ffffff;
  border: none;
  font-family: var(--font-main);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 12px 28px;
  border-radius: 24px;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--thread-red-light);
  transition: var(--ease-spring);
  letter-spacing: -0.01em;
}

.btn-primary:hover {
  background: #E6203E;
  transform: translateY(-2px) scale(1.02);
}

/* ==========================================================================
   STEP 0: HERO OPENING WITH LANDSCAPE PHOTO
   ========================================================================== */
.hero-title {
  font-size: clamp(2.1rem, 5.5vw, 2.7rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--ink-primary);
  margin-bottom: 4px;
  line-height: 1.2;
}

.hero-meta {
  font-size: 0.9rem;
  color: var(--ink-muted);
  font-weight: 500;
  margin-bottom: 22px;
}

/* Cinematic Landscape Frame */
.hero-landscape-card {
  position: relative;
  width: 100%;
  max-width: 480px;
  background: #ffffff;
  padding: 10px 10px 14px 10px;
  border-radius: 6px;
  border: 1px solid var(--border-card);
  box-shadow: 0 6px 20px var(--shadow-soft);
  margin-bottom: 24px;
}

.landscape-photo-frame {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 4px;
  background: #10131A;
}

.landscape-photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.landscape-photo-caption {
  font-family: var(--font-hand);
  font-size: 1.35rem;
  color: var(--thread-red);
  margin-top: 10px;
  line-height: 1.3;
}

.whisper-quote-group {
  max-width: 440px;
  margin: 0 auto;
}

.whisper-quote {
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--ink-muted);
  margin-bottom: 4px;
  letter-spacing: -0.015em;
}

.whisper-quote.line-3 {
  color: var(--ink-primary);
  font-weight: 600;
}

/* ==========================================================================
   STEP 1: BEFORE US
   ========================================================================== */
.quote-scrap-card {
  background: var(--bg-surface);
  border-left: 3px solid var(--accent-pink);
  padding: 12px 18px;
  max-width: 420px;
  border-radius: 0 4px 4px 0;
}

.scrap-text {
  font-size: 0.98rem;
  font-weight: 500;
  color: var(--ink-primary);
  letter-spacing: -0.01em;
}

/* ==========================================================================
   STEP 2: ENCOUNTER & FLIP POLAROID
   ========================================================================== */
.handwritten-accent {
  font-family: var(--font-hand);
  font-size: 1.65rem;
  color: var(--thread-red);
  margin-bottom: 14px;
  transform: rotate(-2deg);
}

.date-banner-box {
  margin-bottom: 22px;
}

.date-highlight {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--ink-primary);
  margin-bottom: 2px;
}

.date-sub {
  font-size: 0.85rem;
  color: var(--ink-muted);
}

/* 3D Flip Card */
.flip-polaroid-box {
  width: 100%;
  max-width: 270px;
  height: 330px;
  perspective: 1000px;
  cursor: pointer;
  margin: 0 auto;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  text-align: center;
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  transform-style: preserve-3d;
}

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

.flip-card-front, .flip-card-back {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  background: #ffffff;
  padding: 10px 10px 14px 10px;
  box-shadow: 0 4px 16px var(--shadow-soft);
  border-radius: 4px;
  display: flex;
  flex-direction: column;
}

.flip-card-back {
  transform: rotateY(180deg);
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  padding: 24px 20px;
  justify-content: center;
  align-items: center;
}

.polaroid-photo-frame {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #10131A;
  border-radius: 2px;
}

.polaroid-photo-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.polaroid-caption-row {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.caption-name {
  font-family: var(--font-hand);
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.caption-flip-hint {
  font-size: 0.72rem;
  color: var(--accent-pink);
  font-weight: 700;
}

.back-meta-tag {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--ink-faded);
  margin-bottom: 12px;
}

.back-memo-text {
  font-family: var(--font-hand);
  font-size: 1.35rem;
  color: var(--thread-red);
  line-height: 1.35;
  margin-bottom: 14px;
}

.back-date-tag {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent-pink);
}

/* Washi Tape */
.washi-tape {
  position: absolute;
  width: 50px;
  height: 15px;
  background: var(--washi-tape);
  z-index: 5;
}

.tape-top-center { top: -7px; left: 50%; transform: translateX(-50%) rotate(1deg); }
.tape-top-left { top: -7px; left: 12px; transform: rotate(-3deg); }
.tape-top-right { top: -7px; right: 12px; transform: rotate(3deg); }

/* ==========================================================================
   STEP 3: MEMORY STOPS & INTERACTIVE RECEIPT
   ========================================================================== */
.memory-tab-strip {
  display: flex;
  gap: 8px;
  margin-bottom: 22px;
  background: var(--bg-surface);
  padding: 4px;
  border-radius: 20px;
}

.mem-tab-pill {
  background: transparent;
  border: none;
  font-family: var(--font-main);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-muted);
  padding: 6px 14px;
  border-radius: 16px;
  cursor: pointer;
  transition: var(--ease-fluid);
}

.mem-tab-pill.active {
  background: var(--bg-card);
  color: var(--thread-red);
  box-shadow: 0 1px 4px var(--shadow-soft);
  font-weight: 700;
}

.memory-panel-view {
  display: none;
  width: 100%;
  animation: fadeIn 0.35s ease;
}

.memory-panel-view.active { display: block; }

.framed-polaroid-simple {
  background: #ffffff;
  padding: 10px 10px 14px 10px;
  box-shadow: 0 4px 16px var(--shadow-soft);
  max-width: 285px;
  margin: 0 auto;
  position: relative;
  border-radius: 4px;
}

.photo-img-wrap {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #10131A;
  border-radius: 2px;
}

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

.hand-caption {
  font-family: var(--font-hand);
  font-size: 1.3rem;
  color: var(--ink-primary);
  margin-top: 10px;
  line-height: 1.3;
}

/* Interactive Receipt Box */
.cafe-receipt-box {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  padding: 20px 18px;
  max-width: 320px;
  margin: 0 auto;
  text-align: left;
  border-radius: 4px;
}

.receipt-timestamp {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  display: block;
  border-bottom: 1px dashed var(--border-card);
  padding-bottom: 6px;
  margin-bottom: 8px;
}

.receipt-sub-hint {
  font-size: 0.72rem;
  color: var(--thread-red);
  font-weight: 700;
  margin-bottom: 10px;
}

.receipt-items-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.receipt-order-btn {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: 4px;
  padding: 8px 10px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--ink-primary);
  cursor: pointer;
  transition: var(--ease-fluid);
}

.receipt-order-btn:hover {
  border-color: var(--accent-pink);
  transform: translateX(2px);
}

.peek-tag {
  font-size: 0.72rem;
  color: var(--thread-red);
  font-weight: 700;
}

.receipt-speech-popup {
  margin-top: 12px;
  padding: 10px 12px;
  background: var(--bg-card);
  border-left: 3px solid var(--thread-red);
  border-radius: 0 4px 4px 0;
  animation: fadeIn 0.3s ease;
}

.receipt-speech-popup.hidden { display: none; }

.speech-text {
  font-family: var(--font-hand);
  font-size: 1.25rem;
  color: var(--thread-red);
  line-height: 1.3;
}

/* ==========================================================================
   STEP 4: UNTANGLE KNOT
   ========================================================================== */
.knot-untangle-box {
  width: 140px;
  margin: 0 auto 16px auto;
  cursor: pointer;
  transition: var(--ease-spring);
}

.knot-untangle-box:hover {
  transform: scale(1.08);
}

.svg-tangled-knot {
  width: 100%;
  height: 80px;
}

.untangle-hint-label {
  font-family: var(--font-hand);
  font-size: 1.25rem;
  color: var(--thread-red);
  font-weight: 600;
  display: block;
  margin-top: 4px;
}

.tangled-prose-block {
  font-size: 0.98rem;
  color: var(--ink-muted);
  line-height: 1.7;
}

.tangled-climax-text {
  color: var(--thread-red);
  font-weight: 700;
  margin-top: 10px;
}

/* ==========================================================================
   STEP 5: AUTHENTIC 3-YEAR PHOTOBOOTH KEEPSAKE STRIP
   ========================================================================== */
.numeral-three-icon {
  width: 44px;
  height: 60px;
  margin-bottom: 8px;
}

.svg-numeral-three {
  width: 100%;
  height: 100%;
}

.photostrip-keepsake-container {
  position: relative;
  background: #ffffff;
  border: 1px solid var(--border-card);
  border-radius: 6px;
  padding: 24px 18px 20px 18px;
  box-shadow: 0 8px 28px var(--shadow-soft);
  max-width: 360px;
  width: 100%;
  margin: 0 auto 10px auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.photostrip-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px dashed var(--border-card);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.photostrip-brand {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--ink-primary);
}

.photostrip-years {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--thread-red);
}

.photostrip-frame-card {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: 4px;
  padding: 10px;
  text-align: center;
  cursor: pointer;
  transition: var(--ease-spring);
}

.photostrip-frame-card:hover, .photostrip-frame-card:focus {
  transform: translateY(-3px) scale(1.02);
  border-color: var(--accent-pink);
  box-shadow: 0 6px 18px var(--shadow-soft);
  background: #ffffff;
}

.frame-year-badge {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--thread-red);
  margin-bottom: 6px;
}

.frame-photo-wrap {
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 3px;
  background: #10131A;
}

.frame-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.frame-hand-memo {
  font-family: var(--font-hand);
  font-size: 1.25rem;
  color: var(--ink-primary);
  margin-top: 8px;
  line-height: 1.25;
}

.photostrip-thread-stitch {
  width: 2px;
  height: 16px;
  background: var(--thread-red);
  margin: 4px auto;
  border-radius: 2px;
  opacity: 0.6;
}

.photostrip-footer {
  width: 100%;
  border-top: 1px dashed var(--border-card);
  padding-top: 12px;
  margin-top: 16px;
  text-align: center;
}

.photostrip-stamp {
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--ink-faded);
}

/* ==========================================================================
   STEP 6: INTERACTIVE KEEPSAKE SECRETS
   ========================================================================== */
.keepsake-grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  width: 100%;
  max-width: 520px;
}

.interactive-keepsake-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: 6px;
  padding: 16px;
  cursor: pointer;
  position: relative;
  text-align: left;
  transition: var(--ease-spring);
}

.interactive-keepsake-card:hover {
  transform: translateY(-3px) scale(1.02);
  border-color: var(--accent-pink);
  box-shadow: 0 4px 14px var(--accent-pink-light);
}

.interactive-keepsake-card.is-unsealed {
  background: #ffffff;
  border-color: var(--thread-red);
  box-shadow: 0 4px 16px var(--thread-red-light);
}

.keepsake-front-preview {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.keepsake-preview-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.keepsake-unseal-prompt {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--thread-red);
  margin-top: 4px;
}

.keepsake-secret-body {
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--accent-pink);
  animation: fadeIn 0.35s ease;
}

.keepsake-secret-body.hidden { display: none; }

.secret-prose {
  font-family: var(--font-hand);
  font-size: 1.35rem;
  color: var(--thread-red);
  line-height: 1.3;
  margin-bottom: 6px;
}

.secret-status-tag {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent-pink);
}

/* ==========================================================================
   STEP 7: OVERHAULED LUXURIOUS LETTER FOR ARU
   ========================================================================== */
.synthesis-quote-card {
  position: relative;
  background: var(--bg-surface);
  border: 1px solid var(--border-card);
  border-radius: 8px;
  padding: 22px 24px;
  max-width: 480px;
  margin-bottom: 24px;
}

.quote-thread-accent {
  width: 32px;
  height: 2px;
  background: var(--thread-red);
  margin: 0 auto 12px auto;
  position: relative;
}

.accent-knot-dot {
  position: absolute;
  top: -3px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--thread-red);
}

.quote-p {
  font-size: 1.05rem;
  color: var(--ink-muted);
  margin-bottom: 4px;
  letter-spacing: -0.015em;
}

.quote-p.focal {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink-primary);
}

.envelope-presentation-box {
  width: 100%;
  max-width: 460px;
}

/* Luxury 3D Envelope */
.luxury-envelope {
  position: relative;
  background: #EFE9DE;
  border: 1.5px solid var(--border-card);
  border-radius: 8px;
  padding: 55px 24px 30px 24px;
  cursor: pointer;
  box-shadow: 0 10px 30px var(--shadow-soft);
  transition: var(--ease-spring);
  overflow: hidden;
}

.luxury-envelope:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 36px rgba(255, 48, 79, 0.15);
  border-color: var(--accent-pink);
}

/* Triangle Flap */
.envelope-triangle-flap {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 0;
  border-left: 230px solid transparent;
  border-right: 230px solid transparent;
  border-top: 55px solid #E4DCCF;
  pointer-events: none;
}

/* Ribbon Bands */
.envelope-ribbon-horizontal {
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--thread-red);
  transform: translateY(-50%);
  box-shadow: 0 1px 4px var(--thread-red-light);
}

.envelope-ribbon-vertical {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 4px;
  background: var(--thread-red);
  transform: translateX(-50%);
  box-shadow: 0 1px 4px var(--thread-red-light);
}

/* Embossed Wax Seal Badge */
.wax-seal-badge {
  position: relative;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 82px;
  height: 82px;
  border-radius: 50%;
  background: var(--thread-red);
  box-shadow: 0 4px 16px rgba(255, 48, 79, 0.35), inset 0 2px 4px rgba(255, 255, 255, 0.3);
  border: 2px solid rgba(255, 255, 255, 0.4);
  margin-bottom: 12px;
  transition: transform 0.3s var(--ease-spring);
}

.luxury-envelope:hover .wax-seal-badge {
  transform: scale(1.08);
}

.wax-seal-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #ffffff;
}

.seal-initials {
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.seal-subtext {
  font-family: var(--font-hand);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1;
}

.envelope-tap-whisper {
  position: relative;
  z-index: 5;
  font-size: 0.76rem;
  font-weight: 600;
  color: var(--ink-muted);
}

/* Unfolded Letter Sheet */
.letter-sheet-parchment {
  position: relative;
  background: #ffffff;
  padding: 38px 28px;
  border: 1px solid var(--border-card);
  border-radius: 8px;
  box-shadow: 0 10px 36px var(--shadow-soft);
  text-align: left;
  animation: unfoldPaper 0.45s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.letter-sheet-parchment.hidden { display: none; }

.btn-fold-letter {
  position: absolute;
  top: 12px;
  right: 14px;
  background: transparent;
  border: none;
  font-family: var(--font-main);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-muted);
  cursor: pointer;
}

.letter-inner-flow {
  max-width: 400px;
  margin: 0 auto;
}

.letter-salutation {
  font-family: var(--font-hand);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--thread-red);
  margin-bottom: 12px;
}

.letter-paragraph {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--ink-primary);
  margin-bottom: 12px;
}

.letter-signature-text {
  font-family: var(--font-hand);
  font-size: 1.8rem;
  color: var(--thread-red);
  margin-top: 16px;
  margin-bottom: 22px;
}

.telegram-reply-action-wrap {
  text-align: center;
  border-top: 1px dashed var(--border-card);
  padding-top: 18px;
}

.btn-reply-telegram {
  display: inline-block;
  background: var(--accent-blue);
  color: #10131A;
  border: 1px solid rgba(16, 19, 26, 0.12);
  padding: 11px 26px;
  border-radius: 20px;
  text-decoration: none;
  font-family: var(--font-main);
  font-size: 0.86rem;
  font-weight: 600;
  transition: var(--ease-spring);
  box-shadow: 0 4px 12px var(--accent-blue-light);
}

.btn-reply-telegram:hover {
  background: #90D2F8;
  transform: translateY(-2px) scale(1.03);
}

.telegram-sub-hint {
  font-size: 0.72rem;
  color: var(--ink-faded);
  margin-top: 6px;
}

/* ==========================================================================
   STEP 8: EPILOGUE
   ========================================================================== */
.epilogue-red-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--thread-red);
  margin-bottom: 16px;
}

.epilogue-title {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--ink-primary);
  margin-bottom: 6px;
}

.epilogue-subtitle {
  font-size: 1rem;
  color: var(--ink-muted);
  margin-bottom: 12px;
}

.epilogue-author {
  font-family: var(--font-hand);
  font-size: 1.7rem;
  color: var(--thread-red);
  margin-bottom: 22px;
}

.btn-restart-action {
  background: transparent;
  border: 1px solid var(--border-card);
  color: var(--ink-muted);
  font-family: var(--font-main);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 16px;
  cursor: pointer;
  transition: var(--ease-fluid);
}

.btn-restart-action:hover {
  color: var(--ink-primary);
  border-color: var(--thread-red);
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes unfoldPaper {
  from { opacity: 0; transform: scaleY(0.92) translateY(8px); }
  to { opacity: 1; transform: scaleY(1) translateY(0); }
}

/* Mobile Responsiveness */
@media (max-width: 640px) {
  .stage-container { padding: 75px 16px 30px 16px; }
  .story-card { padding: 30px 18px; }
  .top-nav-bar { padding: 10px 14px; }
  .brand-title { display: none; }
  .keepsake-grid-container { grid-template-columns: 1fr; }
  .envelope-triangle-flap {
    border-left-width: 160px;
    border-right-width: 160px;
  }
}