/* =========================================
   Anniversary Surprise Website
   Pink Pastel · Modern Minimal · Mobile-first
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;500;600;700&display=swap');

/* --- Design Tokens --- */
:root {
  --pink-50: #FFF0F5;
  --pink-100: #FFE4EE;
  --pink-200: #FFBBCC;
  --pink-300: #FF8FAB;
  --pink-400: #FF6B8A;
  --pink-500: #FF4D6D;
  --pink-600: #E8365D;
  --white: #FFFFFF;
  --text-primary: #4A3040;
  --text-secondary: #8A6578;
  --correct-green: #86C8A8;
  --shadow-sm: 0 2px 8px rgba(255, 107, 138, 0.15);
  --shadow-md: 0 8px 24px rgba(255, 107, 138, 0.2);
  --shadow-lg: 0 16px 48px rgba(255, 107, 138, 0.25);
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Prompt', sans-serif;
  background: linear-gradient(135deg, #FFF0F5 0%, #FFE4EE 25%, #FFF5F8 50%, #FFE4EE 75%, #FFF0F5 100%);
  background-size: 400% 400%;
  animation: gradientShift 20s ease infinite;
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* --- Floating Hearts Background --- */
.floating-hearts {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}

.floating-heart {
  position: absolute;
  bottom: -30px;
  opacity: 0;
  animation: floatUp var(--duration) var(--delay) infinite ease-in;
  will-change: transform, opacity;
}

@keyframes floatUp {
  0% {
    opacity: 0;
    transform: translateY(0) rotate(0deg) scale(0.5);
  }
  10% {
    opacity: 0.5;
  }
  80% {
    opacity: 0.2;
  }
  100% {
    opacity: 0;
    transform: translateY(-105vh) rotate(360deg) scale(1);
  }
}

/* --- Page System --- */
.page {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding: 32px 20px;
  position: relative;
  z-index: 1;
}

.page.active {
  display: flex;
  animation: fadeSlideIn 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.page.exit {
  animation: fadeSlideOut 0.4s ease forwards;
}

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(40px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeSlideOut {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-30px) scale(0.97);
  }
}

/* --- Card (Glassmorphism) --- */
.card {
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  border: 1px solid rgba(255, 187, 204, 0.35);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-md);
  text-align: center;
}

/* --- Heart SVG (Landing Page) --- */
.heart-container {
  margin-bottom: 28px;
  position: relative;
}

.heart-container::before {
  content: '';
  position: absolute;
  inset: -20px;
  background: radial-gradient(circle, rgba(255, 107, 138, 0.2) 0%, transparent 70%);
  border-radius: 50%;
  animation: heartGlow 2s ease-in-out infinite alternate;
}

@keyframes heartGlow {
  from { opacity: 0.5; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1.1); }
}

.heart-svg {
  width: 120px;
  height: 120px;
  filter: drop-shadow(0 8px 24px rgba(255, 77, 109, 0.4));
  animation: heartPulse 1.5s ease-in-out infinite;
  position: relative;
  z-index: 1;
}

@keyframes heartPulse {
  0%, 100% { transform: scale(1); }
  15% { transform: scale(1.18); }
  30% { transform: scale(1); }
  45% { transform: scale(1.12); }
}

/* --- Sparkles around heart --- */
.sparkle {
  position: absolute;
  width: 6px;
  height: 6px;
  background: var(--pink-300);
  border-radius: 50%;
  animation: sparkle 2s ease-in-out infinite;
}

.sparkle:nth-child(1) { top: 10%; left: 5%; animation-delay: 0s; }
.sparkle:nth-child(2) { top: 5%; right: 10%; animation-delay: 0.4s; }
.sparkle:nth-child(3) { bottom: 15%; left: 10%; animation-delay: 0.8s; }
.sparkle:nth-child(4) { bottom: 10%; right: 5%; animation-delay: 1.2s; }
.sparkle:nth-child(5) { top: 50%; left: -5%; animation-delay: 0.6s; }
.sparkle:nth-child(6) { top: 30%; right: -3%; animation-delay: 1s; }

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

/* --- Typography --- */
.greeting {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.title {
  font-size: 1.2rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--pink-400), var(--pink-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 14px;
  line-height: 1.4;
}

.subtitle {
  font-size: 0.95rem;
  font-weight: 300;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 6px;
}

.hint-text {
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--pink-400);
  margin-top: 12px;
}

.question-text {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.question-hint {
  font-size: 0.8rem;
  font-weight: 300;
  color: var(--text-secondary);
  margin-top: -16px;
  margin-bottom: 20px;
}

/* --- Buttons --- */
.music-toggle-btn {
  display: none !important;
}

.music-toggle-btn:hover {
  transform: scale(1.1);
  background: rgba(255, 228, 238, 0.9);
  border-color: var(--pink-300);
}

.music-toggle-btn.playing {
  animation: discRotation 4s linear infinite;
  background: rgba(255, 228, 238, 0.85);
  border-color: var(--pink-400);
  box-shadow: 0 0 12px rgba(255, 107, 138, 0.3);
}

@keyframes discRotation {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 36px;
  border: none;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--pink-400), var(--pink-500));
  color: white;
  font-family: 'Prompt', sans-serif;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  box-shadow: 0 4px 16px rgba(255, 77, 109, 0.3);
  margin-top: 28px;
  -webkit-tap-highlight-color: transparent;
  position: relative;
  overflow: hidden;
  min-height: 48px;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.btn:hover::after {
  opacity: 1;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(255, 77, 109, 0.4);
}

.btn:active {
  transform: translateY(0) scale(0.97);
  box-shadow: 0 2px 8px rgba(255, 77, 109, 0.3);
}

/* --- Date Input --- */
.input-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
}

.date-input {
  width: 100%;
  max-width: 260px;
  padding: 16px 20px;
  border: 2px solid var(--pink-200);
  border-radius: var(--radius-md);
  font-family: 'Prompt', sans-serif;
  font-size: 1.6rem;
  font-weight: 500;
  text-align: center;
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.85);
  outline: none;
  transition: all 0.3s ease;
  letter-spacing: 6px;
}

.date-input:focus {
  border-color: var(--pink-400);
  box-shadow: 0 0 0 4px rgba(255, 107, 138, 0.12);
}

.date-input::placeholder {
  color: var(--pink-200);
  letter-spacing: 3px;
  font-size: 0.95rem;
}

/* --- Quiz Choices --- */
.choices {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
}

.choice-btn {
  width: 100%;
  padding: 16px 24px;
  border: 2px solid rgba(255, 187, 204, 0.5);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-family: 'Prompt', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  text-align: left;
  -webkit-tap-highlight-color: transparent;
  min-height: 52px;
  display: flex;
  align-items: center;
}

.choice-btn:hover {
  border-color: var(--pink-400);
  background: rgba(255, 228, 238, 0.6);
  transform: translateX(6px);
  box-shadow: var(--shadow-sm);
}

.choice-btn:active {
  transform: scale(0.98);
  background: var(--pink-100);
}

.choice-btn.correct {
  border-color: var(--correct-green);
  background: rgba(134, 200, 168, 0.2);
  animation: correctBounce 0.5s ease;
  pointer-events: none;
}

.choice-btn.disabled {
  pointer-events: none;
  opacity: 0.6;
}

@keyframes correctBounce {
  0% { transform: scale(1); }
  30% { transform: scale(1.04); }
  60% { transform: scale(0.98); }
  100% { transform: scale(1); }
}

/* --- Photo Card --- */
.photo-card {
  width: 100%;
  max-width: 400px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-md);
}

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

.photo-info {
  padding: 16px 20px;
  text-align: center;
}

.photo-date {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--pink-400);
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.photo-caption {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  font-weight: 300;
}

/* --- Gallery Page --- */
.gallery-page {
  justify-content: flex-start;
  padding-top: 40px;
  padding-bottom: 60px;
}

.gallery-header {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  text-align: center;
}

.gallery-subheader {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 28px;
  font-weight: 300;
}

.gallery-grid {
  display: flex;
  flex-direction: column;
  gap: 20px;
  width: 100%;
  max-width: 400px;
}

.gallery-item {
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: white;
  box-shadow: var(--shadow-sm);
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.gallery-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
}

.gallery-item-date {
  padding: 12px 16px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--pink-400);
  letter-spacing: 1px;
}

/* --- Modal / Popup (Wrong Answer) --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(74, 48, 64, 0.5);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  padding: 24px;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: white;
  border-radius: var(--radius-lg);
  padding: 40px 32px;
  text-align: center;
  box-shadow: var(--shadow-lg);
  transform: scale(0.85) translateY(20px);
  transition: transform 0.4s cubic-bezier(0.22, 1, 0.36, 1);
  max-width: 320px;
  width: 100%;
}

.modal-overlay.active .modal-content {
  transform: scale(1) translateY(0);
}

.modal-emoji {
  font-size: 4.5rem;
  display: block;
  margin-bottom: 16px;
  animation: sadShake 0.6s ease-in-out;
}

@keyframes sadShake {
  0%, 100% { transform: rotate(0deg); }
  20% { transform: rotate(-8deg); }
  40% { transform: rotate(8deg); }
  60% { transform: rotate(-5deg); }
  80% { transform: rotate(5deg); }
}

.modal-text {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: 24px;
  line-height: 1.6;
}

.modal-close-btn {
  padding: 12px 32px;
  border: none;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--pink-200), var(--pink-300));
  color: var(--text-primary);
  font-family: 'Prompt', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  min-height: 44px;
}

.modal-close-btn:hover {
  background: linear-gradient(135deg, var(--pink-300), var(--pink-400));
  color: white;
  transform: translateY(-1px);
}

.modal-close-btn:active {
  transform: scale(0.97);
}

/* --- Final Page --- */
.final-page {
  padding-top: 60px;
  padding-bottom: 60px;
}

.final-page .card {
  background: rgba(255, 255, 255, 0.85);
  padding: 40px 28px;
}

.final-line {
  font-size: 1rem;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 2;
  opacity: 0;
  transform: translateY(12px);
  animation: fadeInLine 0.8s ease forwards;
}

.final-line:nth-child(1) { animation-delay: 0.3s; }
.final-line:nth-child(2) { animation-delay: 1s; }
.final-line:nth-child(3) { animation-delay: 1.7s; }

.final-signature {
  font-size: 1.15rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--pink-400), var(--pink-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-top: 24px;
  opacity: 0;
  transform: translateY(12px);
  animation: fadeInLine 0.8s ease forwards;
  animation-delay: 3.2s;
}

.final-date {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 8px;
  font-weight: 300;
  letter-spacing: 1px;
  opacity: 0;
  animation: fadeInLine 0.8s ease forwards;
  animation-delay: 4.0s;
}

.final-hearts {
  font-size: 2.5rem;
  margin-top: 24px;
  opacity: 0;
  animation: fadeInLine 0.8s ease forwards, heartPulse 1.5s ease-in-out 4.8s infinite;
  animation-delay: 4.8s;
}

@keyframes fadeInLine {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Decorative Divider --- */
.divider {
  width: 40px;
  height: 3px;
  background: linear-gradient(135deg, var(--pink-300), var(--pink-400));
  border-radius: 2px;
  margin: 16px auto;
}

/* --- Responsive --- */
@media (min-width: 768px) {
  .card {
    padding: 48px 40px;
    max-width: 440px;
  }

  .greeting {
    font-size: 1.75rem;
  }

  .title {
    font-size: 1.4rem;
  }

  .photo-card,
  .gallery-grid {
    max-width: 440px;
  }

  .heart-svg {
    width: 140px;
    height: 140px;
  }
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.page.intro-waiting .card,
.page.intro-animating .card {
  background: transparent;
  border-color: transparent;
  box-shadow: none;
  backdrop-filter: blur(0px) saturate(1);
  -webkit-backdrop-filter: blur(0px) saturate(1);
}

.page.intro-animating .card {
  animation: introCardReveal 1s ease forwards 4.5s;
}

.page.intro-waiting .sparkle,
.page.intro-animating .sparkle {
  display: none;
}

.page.intro-waiting {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.page.intro-waiting .heart-container {
  transform: translateY(20vh);
}

.page.intro-waiting .heart-svg {
  animation: introBeatsInfinite 0.9s cubic-bezier(0.25, 1, 0.5, 1) infinite;
}

.page.intro-animating .heart-container {
  transform: translateY(20vh);
  animation: introMoveUp 1s cubic-bezier(0.25, 1, 0.5, 1) forwards 4.5s;
}

.page.intro-animating .heart-svg {
  animation: introBeats5 4.5s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

.page.intro-waiting .greeting,
.page.intro-waiting .title,
.page.intro-waiting .divider,
.page.intro-waiting .subtitle,
.page.intro-waiting .hint-text,
.page.intro-waiting .btn,
.page.intro-animating .greeting,
.page.intro-animating .title,
.page.intro-animating .divider,
.page.intro-animating .subtitle,
.page.intro-animating .hint-text,
.page.intro-animating .btn {
  opacity: 0;
  transform: translateY(15px);
}

.page.intro-animating .greeting { animation: introFadeIn 0.8s ease forwards 4.8s; }
.page.intro-animating .title { animation: introFadeIn 0.8s ease forwards 4.9s; }
.page.intro-animating .divider { animation: introFadeIn 0.8s ease forwards 5.0s; }
.page.intro-animating .subtitle { animation: introFadeIn 0.8s ease forwards 5.1s; }
.page.intro-animating .hint-text { animation: introFadeIn 0.8s ease forwards 5.2s; }
.page.intro-animating .btn { animation: introFadeIn 0.8s ease forwards 5.3s; }

@keyframes introCardReveal {
  to {
    background: rgba(255, 255, 255, 0.72);
    border-color: rgba(255, 187, 204, 0.35);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(20px) saturate(1.4);
    -webkit-backdrop-filter: blur(20px) saturate(1.4);
  }
}

@keyframes introMoveUp {
  0% { transform: translateY(20vh); }
  100% { transform: translateY(0); }
}

@keyframes introBeatsInfinite {
  0%, 100% { transform: scale(1.5); filter: drop-shadow(0 10px 30px rgba(255, 77, 109, 0.6)); }
  50% { transform: scale(1.8); filter: drop-shadow(0 15px 40px rgba(255, 77, 109, 0.8)); }
}

@keyframes introBeats5 {
  0% { transform: scale(1.5); filter: drop-shadow(0 10px 30px rgba(255, 77, 109, 0.6)); }
  10% { transform: scale(1.8); filter: drop-shadow(0 15px 40px rgba(255, 77, 109, 0.8)); }
  20% { transform: scale(1.5); filter: drop-shadow(0 10px 30px rgba(255, 77, 109, 0.6)); }
  30% { transform: scale(1.8); filter: drop-shadow(0 15px 40px rgba(255, 77, 109, 0.8)); }
  40% { transform: scale(1.5); filter: drop-shadow(0 10px 30px rgba(255, 77, 109, 0.6)); }
  50% { transform: scale(1.8); filter: drop-shadow(0 15px 40px rgba(255, 77, 109, 0.8)); }
  60% { transform: scale(1.5); filter: drop-shadow(0 10px 30px rgba(255, 77, 109, 0.6)); }
  70% { transform: scale(1.8); filter: drop-shadow(0 15px 40px rgba(255, 77, 109, 0.8)); }
  80% { transform: scale(1.5); filter: drop-shadow(0 10px 30px rgba(255, 77, 109, 0.6)); }
  90% { transform: scale(1.8); filter: drop-shadow(0 15px 40px rgba(255, 77, 109, 0.8)); }
  100% { transform: scale(1); filter: drop-shadow(0 8px 24px rgba(255, 77, 109, 0.4)); }
}

@keyframes introFadeIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}