/* ===== Google Fonts Import ===== */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Noto+Serif+SC:wght@400;700;900&family=Inter:wght@300;400;500;600&display=swap');

/* ===== 1. Reset & Variables ===== */
:root {
  --bg-primary: #050510;
  --gold: #ffd700;
  --gold-light: #ffe566;
  --gold-dark: #b8960f;
  --gold-dim: rgba(255, 215, 0, 0.2);
  --accent-rose: #ff6b9d;
  --accent-purple: #7c5bf5;
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.35);
  --font-display: 'Playfair Display', Georgia, serif;
  --font-cn: 'Noto Serif SC', '宋体', serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --transition-fade: 1.2s ease;
}

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

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  -webkit-font-smoothing: antialiased;
  cursor: none;
  user-select: none;
}

/* ===== 2. Canvas Layers ===== */
#particles-canvas {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

#confetti-canvas {
  position: fixed;
  inset: 0;
  z-index: 100;
  pointer-events: none;
}

/* ===== 3. Slide Layers ===== */
.slide-layer {
  position: fixed;
  inset: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition-fade);
  overflow: hidden;
}

.slide-layer.active {
  opacity: 1;
  z-index: 3;
}

/* ===== 4. Hero Slide ===== */
.slide-hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100%;
  height: 100%;
}

.hero-sparkle {
  position: absolute;
  inset: -50%;
  background: radial-gradient(circle at center, rgba(255, 215, 0, 0.04) 0%, transparent 40%);
  animation: pulse-glow 4s ease-in-out infinite;
}

.slide-hero .age-number {
  font-family: var(--font-display);
  font-size: 28vmin;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--gold-light) 0%, var(--gold) 30%, var(--gold-dark) 60%, var(--gold-light) 100%);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 3s ease-in-out infinite;
  filter: drop-shadow(0 0 50px rgba(255, 215, 0, 0.35));
  opacity: 0;
  transform: scale(0.6);
  transition: all 1.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide-hero .age-number.show {
  opacity: 1;
  transform: scale(1);
}

.slide-hero .hero-label {
  font-family: var(--font-body);
  font-size: 1.8vmin;
  font-weight: 500;
  letter-spacing: 1.2em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 3vmin;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.8s ease 0.5s;
}

.slide-hero .hero-label.show {
  opacity: 0.85;
  transform: translateY(0);
}

.slide-hero .hero-title {
  font-family: var(--font-cn);
  font-size: 5vmin;
  font-weight: 700;
  letter-spacing: 0.3em;
  margin-top: 2vmin;
  opacity: 0;
  transform: translateY(30px);
  transition: all 1s ease 0.8s;
}

.slide-hero .hero-title.show {
  opacity: 1;
  transform: translateY(0);
}

.slide-hero .hero-subtitle {
  font-family: var(--font-cn);
  font-size: 2.5vmin;
  color: var(--text-secondary);
  margin-top: 2.5vmin;
  min-height: 4vmin;
  opacity: 0;
  transition: opacity 0.5s ease 1.2s;
}

.slide-hero .hero-subtitle.show {
  opacity: 1;
}

.typewriter-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--gold);
  margin-left: 4px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

.hero-divider {
  width: 80px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  margin-top: 3vmin;
  opacity: 0;
  transform: scaleX(0);
  transition: all 0.8s ease 1.8s;
}

.hero-divider.show {
  opacity: 1;
  transform: scaleX(1);
}

/* ===== 5. Age Intro Slide ===== */
.slide-age-intro {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100%;
  height: 100%;
}

.slide-age-intro .intro-age-num {
  font-family: var(--font-display);
  font-size: 22vmin;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--gold-light), var(--gold), var(--gold-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 40px rgba(255, 215, 0, 0.25));
  opacity: 0;
  transform: scale(0.7);
  transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.slide-age-intro .intro-age-num.show {
  opacity: 1;
  transform: scale(1);
}

.slide-age-intro .intro-age-suffix {
  font-family: var(--font-cn);
  font-size: 5vmin;
  color: var(--gold);
  opacity: 0.7;
  margin-left: 1vmin;
}

.slide-age-intro .intro-title {
  font-family: var(--font-cn);
  font-size: 5vmin;
  font-weight: 700;
  margin-top: 3vmin;
  letter-spacing: 0.4em;
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s ease 0.3s;
}

.slide-age-intro .intro-title.show {
  opacity: 1;
  transform: translateY(0);
}

.slide-age-intro .intro-subtitle {
  font-family: var(--font-body);
  font-size: 2.2vmin;
  color: var(--text-muted);
  margin-top: 2vmin;
  letter-spacing: 0.2em;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.8s ease 0.5s;
}

.slide-age-intro .intro-subtitle.show {
  opacity: 1;
  transform: translateY(0);
}

.intro-line {
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-dim), transparent);
  margin-top: 3vmin;
  opacity: 0;
  transform: scaleX(0);
  transition: all 0.6s ease 0.7s;
}

.intro-line.show {
  opacity: 1;
  transform: scaleX(1);
}

/* ===== 6. Photo Slide ===== */
.slide-photo {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.photo-bg {
  position: absolute;
  inset: -40px;
  background-size: cover;
  background-position: center;
  filter: blur(40px) brightness(0.25) saturate(0.8);
  transform: scale(1.1);
}

.photo-main {
  position: relative;
  max-width: 88%;
  max-height: 82%;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 20px 80px rgba(0, 0, 0, 0.6);
  z-index: 2;
  opacity: 0;
  transform: scale(0.92);
  transition: all 1s cubic-bezier(0.16, 1, 0.3, 1) 0.2s;
}

.photo-main.show {
  opacity: 1;
  transform: scale(1);
}

/* Ken Burns - applied via JS with random params */
.photo-main.kenburns {
  animation: kenburns 8s ease-in-out forwards;
}

.photo-age-label {
  position: absolute;
  bottom: 5vmin;
  left: 5vmin;
  z-index: 5;
  display: flex;
  align-items: baseline;
  gap: 1.5vmin;
  opacity: 0;
  transform: translateY(15px);
  transition: all 0.6s ease 0.6s;
}

.photo-age-label.show {
  opacity: 1;
  transform: translateY(0);
}

.photo-age-label .label-age {
  font-family: var(--font-display);
  font-size: 4vmin;
  font-weight: 700;
  color: var(--gold);
}

.photo-age-label .label-title {
  font-family: var(--font-cn);
  font-size: 2.2vmin;
  color: var(--text-secondary);
}

.photo-counter {
  position: absolute;
  bottom: 5vmin;
  right: 5vmin;
  z-index: 5;
  font-family: var(--font-body);
  font-size: 1.8vmin;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  opacity: 0;
  transition: opacity 0.6s ease 0.6s;
}

.photo-counter.show {
  opacity: 1;
}

/* Vignette overlay */
.photo-vignette {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(5, 5, 16, 0.4) 0%, transparent 20%, transparent 75%, rgba(5, 5, 16, 0.6) 100%),
    linear-gradient(90deg, rgba(5, 5, 16, 0.3) 0%, transparent 15%, transparent 85%, rgba(5, 5, 16, 0.3) 100%);
}

/* ===== 7. Wishes Slide ===== */
.slide-wishes {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  width: 100%;
  height: 100%;
}

.wishes-bg-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 70%, rgba(255, 215, 0, 0.05) 0%, transparent 60%);
  pointer-events: none;
}

/* CSS Cake */
.cake {
  width: 200px;
  margin: 0 auto 4vmin;
  position: relative;
}

.cake-layer {
  margin: 0 auto;
  position: relative;
}

.cake-layer-1 {
  width: 180px;
  height: 55px;
  background: linear-gradient(135deg, #ff9a9e, #fad0c4);
  border-radius: 10px 10px 14px 14px;
  z-index: 1;
}

.cake-layer-2 {
  width: 140px;
  height: 45px;
  background: linear-gradient(135deg, #a18cd1, #fbc2eb);
  margin-top: -3px;
  border-radius: 8px 8px 12px 12px;
  z-index: 2;
}

.cake-layer-3 {
  width: 100px;
  height: 35px;
  background: linear-gradient(135deg, var(--gold-light), var(--gold));
  margin-top: -3px;
  border-radius: 6px 6px 10px 10px;
  z-index: 3;
}

.cake-plate {
  width: 220px;
  height: 14px;
  background: linear-gradient(180deg, #ddd, #aaa);
  border-radius: 50%;
  margin: 3px auto 0;
}

.candles {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-bottom: -4px;
  position: relative;
  z-index: 4;
}

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

.candle-stick {
  width: 5px;
  height: 28px;
  background: linear-gradient(180deg, #ffeb3b, #ff9800);
  border-radius: 3px;
}

.flame-container {
  position: relative;
  width: 14px;
  height: 20px;
  margin-bottom: -2px;
}

.flame {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 9px;
  height: 15px;
  background: radial-gradient(ellipse at bottom, #fff 0%, #ffeb3b 30%, #ff9800 60%, transparent 100%);
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
  animation: flicker 0.5s ease-in-out infinite alternate;
}

.flame-glow {
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 20px;
  background: radial-gradient(circle, rgba(255, 200, 0, 0.3) 0%, transparent 70%);
  animation: flicker 0.6s ease-in-out infinite alternate-reverse;
}

.cake-wrapper {
  opacity: 0;
  transform: translateY(30px) scale(0.9);
  transition: all 1s cubic-bezier(0.16, 1, 0.3, 1);
}

.cake-wrapper.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}

.wishes-title {
  font-family: var(--font-display);
  font-size: 7vmin;
  font-weight: 900;
  background: linear-gradient(135deg, var(--gold-light), var(--gold), var(--accent-rose));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 3vmin;
  opacity: 0;
  transform: translateY(25px);
  transition: all 1s ease 0.4s;
}

.wishes-title.show {
  opacity: 1;
  transform: translateY(0);
}

.wishes-text {
  font-family: var(--font-cn);
  font-size: 2.5vmin;
  color: var(--text-secondary);
  line-height: 2.2;
  max-width: 700px;
  opacity: 0;
  transform: translateY(20px);
  transition: all 1s ease 0.8s;
}

.wishes-text.show {
  opacity: 1;
  transform: translateY(0);
}

.wishes-emoji {
  font-size: 6vmin;
  margin-top: 3vmin;
  opacity: 0;
  transition: all 1s ease 1.2s;
}

.wishes-emoji.show {
  opacity: 1;
}

/* ===== 8. Progress Bar ===== */
.progress-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: rgba(255, 255, 255, 0.06);
  z-index: 50;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--gold-dark), var(--gold), var(--gold-light));
  transition: width 0.3s linear;
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.3);
}

/* Overall slide counter */
.slide-counter {
  position: fixed;
  bottom: 1.5vmin;
  right: 3vmin;
  z-index: 50;
  font-family: var(--font-body);
  font-size: 1.4vmin;
  color: var(--text-muted);
  letter-spacing: 0.1em;
}

/* ===== 9. Pause Overlay ===== */
.pause-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(5, 5, 16, 0.7);
  backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
}

.pause-overlay.active {
  opacity: 1;
  visibility: visible;
}

.pause-icon {
  font-size: 8vmin;
  color: var(--gold);
  margin-bottom: 2vmin;
  letter-spacing: 0.5em;
}

.pause-overlay p {
  font-family: var(--font-cn);
  font-size: 3vmin;
  color: var(--text-secondary);
}

.pause-overlay .pause-hint {
  font-size: 1.8vmin;
  color: var(--text-muted);
  margin-top: 1.5vmin;
}

/* ===== 10. Controls Hint ===== */
.controls-hint {
  position: fixed;
  top: 3vmin;
  right: 3vmin;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.8vmin;
  opacity: 0.6;
  transition: opacity 1s ease;
}

.controls-hint.hidden {
  opacity: 0;
}

.controls-hint span {
  font-size: 1.4vmin;
  color: var(--text-muted);
  letter-spacing: 0.15em;
  background: rgba(255, 255, 255, 0.04);
  padding: 0.6vmin 1.2vmin;
  border-radius: 4px;
}

/* ===== 11. Loading Screen ===== */
.loading-screen {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--bg-primary);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: opacity 0.8s ease, visibility 0.8s ease;
}

.loading-screen.fade-out {
  opacity: 0;
  visibility: hidden;
}

.loading-ring {
  width: 50px;
  height: 50px;
  border: 2px solid rgba(255, 255, 255, 0.08);
  border-top-color: var(--gold);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.loading-text {
  margin-top: 20px;
  font-family: var(--font-cn);
  font-size: 1.6vmin;
  color: var(--text-muted);
  letter-spacing: 0.5em;
}

/* ===== 12. Keyframes ===== */
@keyframes shimmer {

  0%,
  100% {
    background-position: 0% 50%;
  }

  50% {
    background-position: 100% 50%;
  }
}

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

@keyframes blink {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0;
  }
}

@keyframes pulse-glow {

  0%,
  100% {
    opacity: 0.5;
    transform: scale(0.95);
  }

  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

@keyframes flicker {
  0% {
    transform: translateX(-50%) scale(1) rotate(-2deg);
  }

  100% {
    transform: translateX(-50%) scale(1.1) rotate(2deg);
  }
}

@keyframes kenburns {
  0% {
    transform: scale(1) translate(0, 0);
  }

  100% {
    transform: scale(1.06) translate(var(--kb-x, -0.5%), var(--kb-y, -0.5%));
  }
}