/* ============ 基礎 ============ */
:root {
  --paper: #faf7f2;
  --paper-deep: #f3ede3;
  --ink: #4a3f35;
  --ink-soft: #8a7d6f;
  --accent: #e8a87c;
  --accent-deep: #d68d5c;
  --card: #ffffff;
  --shadow: 0 6px 20px rgba(90, 70, 50, 0.14);
  --serif: "Noto Serif TC", serif;
  --sans: "Noto Sans TC", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 400;
  line-height: 1.8;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

.is-hidden { display: none !important; }

main { position: relative; z-index: 2; }

.act {
  position: relative;
  padding: 12vh 24px;
  padding-left: max(24px, env(safe-area-inset-left));
  padding-right: max(24px, env(safe-area-inset-right));
  max-width: 560px;
  margin: 0 auto;
}

/* ============ 背景花瓣 ============ */
#petal-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

/* ============ 音樂按鈕 ============ */
#bgm-btn {
  position: fixed;
  top: calc(14px + env(safe-area-inset-top));
  right: calc(14px + env(safe-area-inset-right));
  z-index: 50;
  border: 1px solid rgba(232, 168, 124, 0.6);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  color: var(--accent-deep);
  font-family: var(--sans);
  font-size: 14px;
  padding: 8px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow);
  cursor: pointer;
  animation: bgm-pulse 2.4s ease-in-out infinite;
}
@keyframes bgm-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); }
}

/* ============ 金額列 ============ */
#amount-bar {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  left: 50%;
  transform: translateX(-50%);
  z-index: 40;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(232, 168, 124, 0.5);
  border-radius: 999px;
  padding: 8px 22px;
  box-shadow: var(--shadow);
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--accent-deep);
  display: flex;
  align-items: center;
  gap: 6px;
  user-select: none;
  -webkit-user-select: none;
  cursor: default;
}
#amount-bar.bump { animation: amount-bump 0.4s ease; }
@keyframes amount-bump {
  0% { transform: translateX(-50%) scale(1); }
  40% { transform: translateX(-50%) scale(1.14); }
  100% { transform: translateX(-50%) scale(1); }
}
.amount-coin { font-size: 18px; }

.fly-chip {
  position: fixed;
  z-index: 45;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 24px;
  color: var(--accent-deep);
  pointer-events: none;
  transition: transform 0.7s cubic-bezier(0.3, 0, 0.4, 1), opacity 0.7s ease;
}

/* ============ 通用元件 ============ */
.section-title {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.08em;
}
.section-sub {
  text-align: center;
  color: var(--ink-soft);
  letter-spacing: 0.25em;
  margin-top: 6px;
  font-size: 14px;
}
.section-head { margin-bottom: 8vh; }

.primary-btn {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 500;
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  border: none;
  border-radius: 999px;
  padding: 14px 44px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.2s ease;
}
.primary-btn:active { transform: scale(0.96); }

.ghost-btn {
  font-family: var(--sans);
  font-size: 17px;
  color: var(--accent-deep);
  background: transparent;
  border: 1.5px solid var(--accent);
  border-radius: 999px;
  padding: 12px 36px;
  cursor: pointer;
  transition: opacity 0.8s ease, transform 0.8s ease;
}

/* 進場動畫 */
.reveal, .reveal-slow {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s ease, transform 0.9s ease;
}
.reveal-slow { transition-duration: 1.6s; }
.reveal.visible, .reveal-slow.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============ 第 1 幕 ============ */
#act1 {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-top: calc(10vh + env(safe-area-inset-top));
}
.act1-deco {
  color: var(--accent);
  letter-spacing: 0.6em;
  font-size: 13px;
  margin-bottom: 18px;
}
#couple-title {
  font-family: var(--serif);
  font-size: clamp(34px, 10vw, 46px);
  font-weight: 700;
  letter-spacing: 0.06em;
}
.act1-subtitle {
  margin-top: 16px;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 300;
  letter-spacing: 0.06em;
}
.counter { margin-top: 9vh; }
.counter-label {
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 0.3em;
}
.counter-days {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 600;
  margin-top: 4px;
}
.counter-days span {
  font-size: clamp(56px, 16vw, 84px);
  font-weight: 700;
  color: var(--accent-deep);
  padding: 0 6px;
  font-variant-numeric: tabular-nums;
}
.counter-ymd {
  margin-top: 8px;
  font-size: 14px;
  color: var(--ink-soft);
  letter-spacing: 0.15em;
}
.anniv-badge {
  margin-top: 20px;
  display: inline-block;
  font-family: var(--serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--accent-deep);
  background: rgba(232, 168, 124, 0.14);
  border: 1px dashed var(--accent);
  border-radius: 999px;
  padding: 8px 22px;
  animation: badge-glow 2s ease-in-out infinite;
}
@keyframes badge-glow {
  0%, 100% { box-shadow: 0 0 0 rgba(232, 168, 124, 0); }
  50% { box-shadow: 0 0 18px rgba(232, 168, 124, 0.5); }
}

.scroll-hint {
  position: absolute;
  bottom: calc(26px + env(safe-area-inset-bottom));
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
  color: var(--ink-soft);
  font-size: 12px;
  letter-spacing: 0.3em;
}
.scroll-arrow {
  font-size: 26px;
  line-height: 1;
  color: var(--accent);
  animation: arrow-bounce 1.8s ease-in-out infinite;
}
@keyframes arrow-bounce {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(8px); opacity: 1; }
}

/* ============ 第 2 幕：時間軸 ============ */
.timeline-year { margin-bottom: 11vh; }
.timeline-year-head { text-align: center; margin-bottom: 24px; }
.timeline-year-num {
  font-family: var(--serif);
  font-size: 42px;
  font-weight: 700;
  color: var(--accent-deep);
  letter-spacing: 0.05em;
  line-height: 1.2;
}
.timeline-year-title {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  margin-top: 2px;
}
.timeline-year-note {
  font-size: 14px;
  color: var(--ink-soft);
  margin-top: 6px;
  font-weight: 300;
}

.photo-row {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 14px 8px 22px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.photo-row::-webkit-scrollbar { display: none; }
.photo-row.single { justify-content: center; }

.polaroid {
  background: var(--card);
  padding: 10px 10px 30px;
  border-radius: 3px;
  box-shadow: var(--shadow);
  transform: rotate(var(--tilt, 0deg));
  flex: 0 0 auto;
  width: min(68vw, 300px);
  scroll-snap-align: center;
}
.polaroid img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 2px;
  background: var(--paper-deep);
}
.polaroid-caption {
  text-align: center;
  font-size: 12px;
  color: var(--ink-soft);
  margin-top: 10px;
  letter-spacing: 0.1em;
}

.corgi-spot { text-align: center; margin-top: 2vh; }
.corgi-svg { width: 96px; height: auto; margin: 0 auto; opacity: 0.85; }
.corgi-caption { font-size: 12px; color: var(--ink-soft); margin-top: 6px; letter-spacing: 0.1em; }

/* ============ 卡片（可讀式，像真的在讀一張卡片） ============ */
.cards-section .section-head { margin-bottom: 6vh; }

.cards-list {
  display: flex;
  flex-direction: column;
  gap: 44px;
  align-items: center;
}

.greeting-card {
  width: 100%;
  max-width: 480px;
  background: linear-gradient(160deg, #fffdfa, #fdf7ef);
  border-radius: 12px;
  box-shadow: 0 14px 36px rgba(90, 70, 50, 0.18);
  padding: 7px;
}
.greeting-card-inner {
  border: 1px solid rgba(214, 141, 92, 0.45);
  border-radius: 8px;
  padding: 40px 30px 34px;
}

.greeting-card-flourish {
  text-align: center;
  color: var(--accent);
  font-size: 20px;
  line-height: 1;
  margin-bottom: 22px;
}
.greeting-card-title {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  text-align: center;
  letter-spacing: 0.04em;
  margin-bottom: 24px;
}
.greeting-card-body p {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 2.1;
  color: var(--ink);
  margin-bottom: 18px;
  text-align: justify;
  text-justify: inter-character;
}
.greeting-card-body p:last-child { margin-bottom: 0; }
.greeting-card-sign {
  font-family: var(--serif);
  font-size: 16px;
  color: var(--ink-soft);
  text-align: right;
  margin-top: 26px;
  letter-spacing: 0.08em;
}

/* ============ 第 3 幕：情書 ============ */
#act3 { padding-top: 4vh; }
.letter-paper {
  background:
    linear-gradient(rgba(255, 255, 255, 0.94), rgba(255, 255, 255, 0.94)),
    repeating-linear-gradient(0deg, transparent 0 34px, rgba(232, 168, 124, 0.16) 34px 35px);
  border: 1px solid rgba(214, 141, 92, 0.25);
  border-radius: 6px;
  box-shadow: var(--shadow);
  padding: 44px 28px;
  min-height: 60svh;
}
.letter-deco-line {
  height: 3px;
  width: 64px;
  margin: 0 auto 34px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.letter-line {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 2.1;
  margin-bottom: 14px;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 1.1s ease, transform 1.1s ease;
}
.letter-line.shown { opacity: 1; transform: translateY(0); }

.letter-final-wrap {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 8vh;
}
.letter-final {
  font-family: var(--serif);
  font-size: clamp(26px, 7.5vw, 38px);
  font-weight: 700;
  line-height: 1.9;
  letter-spacing: 0.04em;
}

/* ============ 第 4 幕：測驗 ============ */
#act4 { min-height: 90svh; }
.quiz-intro {
  min-height: 80svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 26px;
}
.quiz-intro-text {
  font-family: var(--serif);
  font-size: 19px;
  line-height: 2;
}
.quiz-intro-rule { color: var(--ink-soft); font-size: 15px; }
.quiz-intro-rule strong { color: var(--accent-deep); font-family: var(--serif); }

.quiz-stage {
  min-height: 90svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 64px;
}
.quiz-progress {
  text-align: center;
  color: var(--ink-soft);
  letter-spacing: 0.2em;
  font-size: 15px;
  margin-bottom: 20px;
}
.quiz-photo-wrap { display: flex; justify-content: center; margin-bottom: 30px; }
.quiz-photo-wrap .polaroid { width: min(78vw, 340px); }
.quiz-placeholder {
  width: min(78vw, 340px);
  aspect-ratio: 4 / 3;
  border: 2px dashed rgba(232, 168, 124, 0.6);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.6);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
  color: var(--ink-soft);
  font-size: 15px;
}
.quiz-placeholder .emoji { font-size: 34px; }

.quiz-btn-row {
  display: flex;
  gap: 14px;
  justify-content: center;
}
.quiz-btn {
  flex: 1;
  max-width: 220px;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 500;
  padding: 16px 10px;
  border-radius: 16px;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}
.quiz-btn:active { transform: scale(0.95); }
.quiz-btn:disabled { opacity: 0.55; }
.quiz-btn-pass {
  background: linear-gradient(135deg, var(--accent), var(--accent-deep));
  color: #fff;
}
.quiz-btn-fail {
  background: var(--card);
  color: var(--ink);
  border: 1.5px solid rgba(138, 125, 111, 0.35);
}

/* ============ 第 5 幕：結算 ============ */
#act5 {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 5vh;
  padding-bottom: calc(10vh + env(safe-area-inset-bottom));
}
.settling p {
  font-family: var(--serif);
  font-size: 22px;
  color: var(--ink-soft);
  letter-spacing: 0.3em;
  animation: settle-blink 1.2s ease-in-out infinite;
}
@keyframes settle-blink {
  0%, 100% { opacity: 0.35; }
  50% { opacity: 1; }
}

.final-amount-label {
  font-size: 15px;
  color: var(--ink-soft);
  letter-spacing: 0.25em;
}
.final-amount {
  font-family: var(--serif);
  font-size: clamp(58px, 17vw, 92px);
  font-weight: 700;
  color: var(--accent-deep);
  line-height: 1.3;
  font-variant-numeric: tabular-nums;
}

.reward-card {
  background: var(--card);
  border: 1px solid rgba(232, 168, 124, 0.5);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 36px 30px;
  max-width: 400px;
  width: 100%;
  animation: card-pop 0.9s cubic-bezier(0.2, 1.4, 0.4, 1);
}
@keyframes card-pop {
  0% { opacity: 0; transform: scale(0.7) translateY(30px); }
  100% { opacity: 1; transform: scale(1) translateY(0); }
}
.reward-card h2 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 700;
}
.reward-subtitle {
  margin-top: 10px;
  color: var(--accent-deep);
  font-family: var(--serif);
  font-size: 16px;
  letter-spacing: 0.15em;
}
.reward-footnote {
  margin-top: 16px;
  font-size: 12.5px;
  color: var(--ink-soft);
  border-top: 1px dashed rgba(138, 125, 111, 0.3);
  padding-top: 14px;
}

.finale-photo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  animation: fade-in 1.5s ease;
}
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
.polaroid-final {
  --tilt: -2deg;
  width: min(76vw, 330px);
}
.signature {
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.12em;
}
.corgi-tiny svg { width: 54px; height: auto; opacity: 0.8; }
.forever {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.28em;
}

#confetti-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 60;
  pointer-events: none;
}

/* ============ 桌機微調 ============ */
@media (min-width: 700px) {
  .act { max-width: 640px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01s !important; transition-duration: 0.01s !important; }
}