/* ==========================================================================
   ROMANTIC PINK HEART CONFESSION - HUY THÍCH TRÚC
   Design System: Soft UI Evolution + Glassmorphism + Romantic Motion Physics
   ========================================================================== */

:root {
  --font-display: 'Dancing Script', cursive;
  --font-serif: 'Playfair Display', serif;
  --font-sans: 'Be Vietnam Pro', 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;

  /* Color Palette - Romantic Rose & Soft Blush */
  --color-bg-light: #FFF5F7;
  --color-bg-blush: #FFE4E8;
  --color-bg-card: rgba(255, 255, 255, 0.85);
  --color-card-border: rgba(255, 255, 255, 0.95);
  
  --color-primary: #E11D48; /* Rose 600 */
  --color-primary-hover: #BE123C; /* Rose 700 */
  --color-primary-light: #FDA4AF; /* Rose 300 */
  --color-secondary: #F472B6; /* Pink 400 */
  --color-accent-gold: #F59E0B; /* Amber 500 */
  --color-accent-gold-light: #FDE68A;

  --color-text-main: #4C0519; /* Rose 950 - High contrast */
  --color-text-muted: #881337; /* Rose 900 */
  --color-text-soft: #9F1239; /* Rose 800 */

  /* Glassmorphism & Shadows */
  --glass-shadow: 0 20px 50px rgba(225, 29, 72, 0.12), 0 4px 12px rgba(244, 63, 94, 0.08);
  --glass-shadow-hover: 0 25px 60px rgba(225, 29, 72, 0.2), 0 8px 20px rgba(244, 63, 94, 0.12);
  --glow-pink: 0 0 30px rgba(244, 114, 182, 0.5);
  --glow-heart: 0 0 20px rgba(225, 29, 72, 0.6);

  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 32px;
  --radius-full: 9999px;

  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-smooth: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-light);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  line-height: 1.6;
}

/* Ambient animated background gradients */
.bg-gradient-mesh {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -2;
  background: 
    radial-gradient(circle at 15% 20%, rgba(253, 164, 175, 0.45) 0%, transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(254, 205, 211, 0.5) 0%, transparent 50%),
    radial-gradient(circle at 50% 60%, rgba(251, 113, 133, 0.25) 0%, transparent 60%),
    radial-gradient(circle at 20% 85%, rgba(244, 114, 182, 0.35) 0%, transparent 50%),
    radial-gradient(circle at 80% 85%, rgba(253, 186, 116, 0.3) 0%, transparent 45%),
    linear-gradient(180deg, #FFF5F7 0%, #FFE4E8 50%, #FFF0F3 100%);
  animation: meshFloat 18s ease-in-out infinite alternate;
}

@keyframes meshFloat {
  0% { transform: scale(1) translate(0, 0); }
  50% { transform: scale(1.04) translate(-10px, 15px); }
  100% { transform: scale(1) translate(10px, -10px); }
}

#romantic-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: -1;
}

/* Floating Audio Player Widget */
.audio-player-pill {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1100;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 18px 8px 10px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-full);
  box-shadow: 0 8px 24px rgba(225, 29, 72, 0.12);
  cursor: pointer;
  transition: var(--transition-fast);
  user-select: none;
}

.audio-player-pill:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(225, 29, 72, 0.18);
  border-color: var(--color-primary-light);
}

.vinyl-disc {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: radial-gradient(circle, #E11D48 20%, #4C0519 21%, #881337 60%, #1E050B 100%);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
}

.vinyl-disc::after {
  content: '';
  width: 8px;
  height: 8px;
  background: #FFF;
  border-radius: 50%;
  box-shadow: 0 0 2px rgba(0,0,0,0.5);
}

.vinyl-disc.spinning {
  animation: spinVinyl 3.5s linear infinite;
}

@keyframes spinVinyl {
  100% { transform: rotate(360deg); }
}

.music-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 16px;
}

.music-bar {
  width: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  height: 4px;
  transition: height 0.2s ease;
}

.music-bars.playing .music-bar:nth-child(1) { animation: soundWave 0.8s ease-in-out infinite alternate; }
.music-bars.playing .music-bar:nth-child(2) { animation: soundWave 0.6s ease-in-out infinite 0.2s alternate; }
.music-bars.playing .music-bar:nth-child(3) { animation: soundWave 0.9s ease-in-out infinite 0.4s alternate; }

@keyframes soundWave {
  0% { height: 4px; }
  100% { height: 16px; }
}

.music-info {
  display: flex;
  flex-direction: column;
}

.music-title {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-main);
  white-space: nowrap;
}

.music-status {
  font-size: 0.65rem;
  color: var(--color-text-muted);
}

/* App Container */
.app-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px 100px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

/* Glassmorphism Card Style */
.glass-card {
  background: var(--color-bg-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
  padding: 40px;
  width: 100%;
  position: relative;
  transition: var(--transition-smooth);
}

/* STAGE 1: ENVELOPE INTRO */
.envelope-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 32px;
  animation: fadeIn 1s ease forwards;
}

.tagline-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--color-primary-light);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary);
  box-shadow: 0 4px 15px rgba(225, 29, 72, 0.08);
}

.envelope-wrapper {
  position: relative;
  width: 320px;
  height: 220px;
  cursor: pointer;
  perspective: 1000px;
  transition: transform var(--transition-fast);
}

.envelope-wrapper:hover {
  transform: translateY(-6px) scale(1.02);
}

.envelope-box {
  width: 100%;
  height: 100%;
  background: linear-gradient(145deg, #FFF0F3 0%, #FFE4E8 100%);
  border-radius: var(--radius-md);
  box-shadow: 0 20px 45px rgba(225, 29, 72, 0.18), inset 0 0 20px rgba(255,255,255,0.8);
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.8);
}

/* Envelope Flaps */
.flap-left, .flap-right, .flap-bottom {
  position: absolute;
  width: 0;
  height: 0;
  border-style: solid;
}

.flap-left {
  top: 0;
  left: 0;
  border-width: 110px 0 110px 160px;
  border-color: transparent transparent transparent rgba(254, 205, 211, 0.5);
  z-index: 2;
}

.flap-right {
  top: 0;
  right: 0;
  border-width: 110px 160px 110px 0;
  border-color: transparent rgba(253, 164, 175, 0.45) transparent transparent;
  z-index: 2;
}

.flap-bottom {
  bottom: 0;
  left: 0;
  border-width: 0 160px 130px 160px;
  border-color: transparent transparent rgba(254, 226, 230, 0.7) transparent;
  z-index: 3;
}

.flap-top {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 130px 160px 0 160px;
  border-color: rgba(251, 113, 133, 0.7) transparent transparent transparent;
  transform-origin: top center;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 4;
}

.envelope-wrapper.open .flap-top {
  transform: rotateX(180deg);
  z-index: 1;
}

/* Wax Seal */
.wax-seal {
  position: absolute;
  top: 110px;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 68px;
  height: 68px;
  background: radial-gradient(circle at 35% 35%, #F43F5E 0%, #BE123C 60%, #881337 100%);
  border-radius: 50%;
  box-shadow: 0 6px 18px rgba(190, 18, 60, 0.4), inset 0 2px 4px rgba(255,255,255,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  transition: transform 0.3s ease;
}

.wax-seal:hover {
  transform: translate(-50%, -50%) scale(1.08);
}

.seal-emblem {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: #FFF;
  text-shadow: 0 1px 3px rgba(0,0,0,0.4);
}

.envelope-prompt {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.envelope-title {
  font-family: var(--font-display);
  font-size: 2.4rem;
  color: var(--color-primary);
  line-height: 1.2;
}

.envelope-sub {
  font-size: 1rem;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
}

.pulse-hint {
  animation: gentlePulse 2s infinite ease-in-out;
}

@keyframes gentlePulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.05); opacity: 0.85; }
}

/* STAGE 2: THE CONFESSION MAIN EXPERIENCE */
.confession-stage {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 40px;
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.confession-stage.active {
  display: flex;
}

/* Romantic Letter Container */
.parchment-letter {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(254, 205, 211, 0.8);
  border-radius: var(--radius-lg);
  padding: 48px;
  position: relative;
  box-shadow: var(--glass-shadow);
  overflow: hidden;
}

.parchment-letter::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(90deg, #FDA4AF 0%, #E11D48 50%, #F472B6 100%);
}

.letter-header {
  margin-bottom: 24px;
}

.letter-to {
  font-family: var(--font-display);
  font-size: 2.8rem;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 6px;
}

.letter-date {
  font-size: 0.85rem;
  color: var(--color-text-soft);
  font-style: italic;
}

.letter-body {
  font-size: 1.125rem;
  line-height: 1.85;
  color: var(--color-text-main);
  min-height: 180px;
  white-space: pre-line;
}

.typewriter-cursor {
  display: inline-block;
  width: 3px;
  height: 1.2em;
  background-color: var(--color-primary);
  margin-left: 4px;
  vertical-align: text-bottom;
  animation: blink 0.75s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.letter-footer {
  margin-top: 32px;
  display: flex;
  justify-content: flex-end;
}

.letter-from {
  text-align: right;
  font-family: var(--font-display);
  font-size: 2.2rem;
  color: var(--color-primary-hover);
}

.letter-from-sub {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* REASONS GRID (Why Huy Fell For Trúc) */
.reasons-section {
  width: 100%;
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 28px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 1.85rem;
  font-weight: 700;
  color: var(--color-text-main);
  margin-bottom: 8px;
}

.section-sub {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.reasons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.reason-card {
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(254, 205, 211, 0.6);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: var(--transition-fast);
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: 0 4px 16px rgba(225, 29, 72, 0.05);
}

.reason-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.95);
  border-color: var(--color-primary-light);
  box-shadow: 0 12px 28px rgba(225, 29, 72, 0.12);
}

.reason-icon-pill {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, #FFF0F3 0%, #FFE4E8 100%);
  border: 1px solid var(--color-primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.reason-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.reason-desc {
  font-size: 0.925rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* POLAROID MEMORIES STRIP */
.polaroids-strip {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
  margin: 10px 0;
}

.polaroid-card {
  background: #FFF;
  padding: 14px 14px 24px;
  border-radius: 6px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.08);
  width: 250px;
  transition: transform 0.3s ease;
  transform: rotate(-2deg);
}

.polaroid-card:nth-child(2) {
  transform: rotate(2deg);
}

.polaroid-card:nth-child(3) {
  transform: rotate(-1deg);
}

.polaroid-card:hover {
  transform: rotate(0) scale(1.04) translateY(-6px);
  box-shadow: 0 20px 40px rgba(225, 29, 72, 0.15);
  z-index: 10;
}

.polaroid-img-frame {
  width: 100%;
  height: 200px;
  border-radius: 4px;
  background: linear-gradient(135deg, #FFDEE9 0%, #B5FFFC 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.polaroid-caption {
  margin-top: 14px;
  text-align: center;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--color-text-main);
}

/* THE GRAND QUESTION BOX */
.confession-ask-box {
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.95) 0%, rgba(255, 240, 243, 0.95) 100%);
  border: 2px solid var(--color-primary-light);
  border-radius: var(--radius-lg);
  padding: 50px 30px;
  text-align: center;
  box-shadow: var(--glass-shadow-hover);
  position: relative;
  overflow: hidden;
}

.beating-heart-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 76px;
  height: 76px;
  border-radius: 50%;
  background: linear-gradient(135deg, #E11D48 0%, #BE123C 100%);
  color: #FFF;
  margin-bottom: 20px;
  box-shadow: var(--glow-heart);
  animation: heartThump 1.2s ease-in-out infinite;
}

@keyframes heartThump {
  0%, 100% { transform: scale(1); }
  15% { transform: scale(1.22); }
  30% { transform: scale(1.05); }
  45% { transform: scale(1.28); }
  60% { transform: scale(1); }
}

.ask-title {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  color: var(--color-text-main);
  line-height: 1.25;
  margin-bottom: 12px;
}

.ask-sub {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 580px;
  margin: 0 auto 36px;
}

/* ACTION BUTTONS & RUNAWAY BUTTON */
.ask-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  position: relative;
  min-height: 90px;
}

.btn-yes {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 42px;
  background: linear-gradient(135deg, #FF4B72 0%, #E11D48 50%, #BE123C 100%);
  color: #FFF;
  font-family: var(--font-sans);
  font-size: 1.2rem;
  font-weight: 700;
  border: none;
  border-radius: var(--radius-full);
  box-shadow: 0 10px 28px rgba(225, 29, 72, 0.4), inset 0 1px 1px rgba(255,255,255,0.4);
  cursor: pointer;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.25s ease;
  user-select: none;
}

.btn-yes:hover {
  transform: translateY(-3px) scale(1.06);
  box-shadow: 0 16px 36px rgba(225, 29, 72, 0.55);
}

.btn-yes:active {
  transform: scale(0.98);
}

.btn-no {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--color-text-muted);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  border: 1px solid var(--color-card-border);
  border-radius: var(--radius-full);
  box-shadow: 0 4px 14px rgba(0,0,0,0.06);
  cursor: pointer;
  transition: left 0.32s cubic-bezier(0.34, 1.56, 0.64, 1), top 0.32s cubic-bezier(0.34, 1.56, 0.64, 1), transform 0.25s ease, box-shadow 0.25s ease;
  user-select: none;
  position: relative;
  white-space: nowrap;
}

.btn-no.roaming {
  position: fixed !important;
  width: auto !important;
  max-width: max-content !important;
  z-index: 999 !important;
  box-shadow: 0 14px 32px rgba(225, 29, 72, 0.25), 0 4px 12px rgba(0,0,0,0.1) !important;
  border-color: var(--color-primary-light) !important;
}

#btn-skip-type {
  padding: 8px 12px;
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  border-radius: var(--radius-sm);
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
}

#btn-skip-type:hover,
#btn-skip-type:focus-visible {
  opacity: 0.85;
  background-color: rgba(225, 29, 72, 0.08);
  outline: none;
}

.btn-no-placeholder {
  display: inline-flex;
  width: 140px;
  height: 52px;
  pointer-events: none;
  visibility: hidden;
}

.no-message-tooltip {
  margin-top: 14px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-primary);
  min-height: 24px;
  animation: fadeIn 0.3s ease;
}

/* CELEBRATION MODAL OVERLAY */
.celebration-modal {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: rgba(76, 5, 25, 0.65);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.celebration-modal.active {
  display: flex;
  animation: fadeIn 0.5s ease forwards;
}

.celebration-card {
  background: linear-gradient(160deg, #FFFFFF 0%, #FFF5F7 100%);
  border: 2px solid #FDA4AF;
  border-radius: var(--radius-lg);
  padding: 48px 36px;
  max-width: 580px;
  width: 100%;
  margin: auto;
  text-align: center;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.25), var(--glow-pink);
  position: relative;
  animation: popIn 0.6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.btn-modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(225, 29, 72, 0.08);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary);
  font-size: 1.6rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition-fast);
  z-index: 10;
}

.btn-modal-close:hover,
.btn-modal-close:focus-visible {
  background: var(--color-primary);
  color: #FFF;
  transform: rotate(90deg);
  outline: none;
}

@keyframes popIn {
  0% { transform: scale(0.7); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

.celebration-badge {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, #FF4B72 0%, #E11D48 100%);
  color: #FFF;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  box-shadow: 0 10px 30px rgba(225, 29, 72, 0.45);
}

.celebration-title {
  font-family: var(--font-display);
  font-size: 3rem;
  color: var(--color-primary);
  line-height: 1.1;
  margin-bottom: 12px;
}

.celebration-sub {
  font-size: 1.125rem;
  color: var(--color-text-main);
  line-height: 1.7;
  margin-bottom: 28px;
}

/* Relationship Live Timer */
.love-timer-box {
  background: rgba(255, 240, 243, 0.7);
  border: 1px dashed var(--color-primary-light);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-bottom: 30px;
}

.love-timer-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-soft);
  font-weight: 600;
  margin-bottom: 10px;
}

.timer-units {
  display: flex;
  justify-content: center;
  gap: 16px;
}

.timer-unit-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.timer-num {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

.timer-tag {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* Celebration Actions */
.celebration-actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.btn-message-huy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 28px;
  background: linear-gradient(135deg, #0084FF 0%, #0066CC 100%);
  color: #FFF;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-decoration: none;
  box-shadow: 0 8px 20px rgba(0, 132, 255, 0.3);
  transition: var(--transition-fast);
}

.btn-message-huy:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(0, 132, 255, 0.4);
}

.btn-copy-sweet {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 24px;
  background: rgba(255, 255, 255, 0.95);
  border: 1px solid var(--color-primary-light);
  color: var(--color-primary);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: var(--transition-fast);
}

.btn-copy-sweet:hover {
  background: #FFF0F3;
  transform: translateY(-2px);
}

/* Toast Notification */
.toast-notice {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(76, 5, 25, 0.92);
  color: #FFF;
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-size: 0.9rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
  z-index: 2000;
  opacity: 0;
  transition: all 0.35s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Mobile & Responsive Tuning */
@media (max-width: 640px) {
  .app-container {
    padding: 40px 16px 80px;
  }

  .envelope-wrapper {
    width: 280px;
    height: 190px;
  }

  .flap-left { border-width: 95px 0 95px 140px; }
  .flap-right { border-width: 95px 140px 95px 0; }
  .flap-bottom { border-width: 0 140px 115px 140px; }
  .flap-top { border-width: 115px 140px 0 140px; }

  .wax-seal {
    top: 95px;
    width: 58px;
    height: 58px;
  }

  .envelope-title { font-size: 2rem; }
  .letter-to { font-size: 2.2rem; }
  .letter-from { font-size: 1.8rem; }
  .ask-title { font-size: 1.65rem; }

  .parchment-letter {
    padding: 28px 20px;
  }

  .confession-ask-box {
    padding: 36px 18px;
  }

  .ask-actions {
    flex-direction: column;
    gap: 16px;
  }

  .btn-yes {
    width: 100%;
    justify-content: center;
  }

  .btn-no:not(.roaming) {
    width: 100%;
    justify-content: center;
  }

  .btn-no.roaming {
    width: auto !important;
    max-width: max-content !important;
  }

  .celebration-card {
    padding: 32px 20px;
  }

  .celebration-title {
    font-size: 2.3rem;
  }
}

@media (max-height: 620px) {
  .celebration-card {
    padding: 24px 20px;
  }
  .celebration-badge {
    width: 60px;
    height: 60px;
    margin-bottom: 12px;
  }
  .celebration-title {
    font-size: 1.85rem;
    margin-bottom: 8px;
  }
  .celebration-sub {
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 16px;
  }
  .love-timer-box {
    padding: 12px;
    margin-bottom: 16px;
  }
}

/* Accessibility: prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .bg-gradient-mesh {
    animation: none;
  }
}