/* ============================================
   主樣式
   ============================================ */

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-background);
  overflow-x: hidden;
}

.container {
  width: min(100% - 2.5rem, var(--container-max));
  margin-inline: auto;
}

section {
  padding-block: var(--section-gap);
}

/* ===== 標題系統 ===== */
.section-head {
  text-align: center;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.section-head .en {
  font-family: var(--font-serif-en);
  font-size: clamp(0.85rem, 1.6vw, 1rem);
  letter-spacing: 0.45em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 0.6rem;
}

.section-head h2 {
  font-family: var(--font-serif-tc);
  font-weight: 600;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  color: var(--color-heading);
  letter-spacing: 0.18em;
}

.section-head .divider {
  width: 56px;
  height: 1px;
  background: var(--color-primary);
  margin: 1.2rem auto 0;
  position: relative;
}

.section-head .divider::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 7px;
  background: var(--color-primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

/* ===== 導覽列 ===== */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  padding: 0.9rem 1.4rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.4s var(--ease-soft), box-shadow 0.4s, padding 0.4s;
}

.site-nav.scrolled {
  background: rgba(255, 250, 245, 0.92);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 18px rgba(70, 58, 53, 0.08);
  padding-block: 0.6rem;
}

.nav-brand {
  font-family: var(--font-serif-en);
  font-size: 1.15rem;
  letter-spacing: 0.12em;
  color: var(--color-white);
  transition: color 0.4s;
  text-shadow: 0 1px 10px rgba(45, 32, 26, 0.55);
}

.site-nav.scrolled .nav-brand {
  text-shadow: none;
}

.site-nav.scrolled .nav-brand {
  color: var(--color-heading);
}

.nav-links {
  display: flex;
  gap: 1.6rem;
}

.nav-links a {
  font-size: 0.88rem;
  letter-spacing: 0.14em;
  color: var(--color-white);
  opacity: 0.9;
  transition: color 0.4s, opacity 0.3s;
  padding: 0.3rem 0.1rem;
  text-shadow: 0 1px 10px rgba(45, 32, 26, 0.55);
}

.site-nav.scrolled .nav-links a,
.nav-links a.nav-rsvp {
  text-shadow: none;
}

.site-nav.scrolled .nav-links a {
  color: var(--color-text);
}

.nav-links a:hover {
  opacity: 1;
  color: var(--color-primary);
}

/* ===== 首頁主視覺 ===== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: flex-end;   /* 文字放底部，避免壓到照片中的人物 */
  justify-content: center;
  text-align: center;
  padding: 0;
  overflow: hidden;
  background: var(--ph-hero);
}

.hero .hero-photo {
  position: absolute;
  inset: 0;
}

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

.hero::after {
  /* 上緣輕壓暗（讓導覽列清楚）、下緣重壓暗（讓主文字清楚） */
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(52, 38, 32, 0.32) 0%,
    rgba(52, 38, 32, 0.02) 30%,
    rgba(52, 38, 32, 0.08) 52%,
    rgba(48, 34, 28, 0.46) 76%,
    rgba(42, 30, 25, 0.74) 100%
  );
  pointer-events: none;
}

.hero-content {
  /* 文字直接疊在照片上：以多層陰影（貼邊黑邊＋柔光暈）確保可讀 */
  position: relative;
  z-index: 2;
  color: var(--color-white);
  margin: 0 1.25rem clamp(7.5rem, 17vh, 10rem);
  padding: 0 0.5rem;
  /* 8 方向 1px 實心描邊 + 近距深影 + 柔光暈：亮背景上維持清楚輪廓 */
  text-shadow:
    -1px -1px 0 rgba(38, 27, 22, 0.8),
    1px -1px 0 rgba(38, 27, 22, 0.8),
    -1px 1px 0 rgba(38, 27, 22, 0.8),
    1px 1px 0 rgba(38, 27, 22, 0.8),
    0 -1px 0 rgba(38, 27, 22, 0.8),
    0 1px 0 rgba(38, 27, 22, 0.8),
    -1px 0 0 rgba(38, 27, 22, 0.8),
    1px 0 0 rgba(38, 27, 22, 0.8),
    0 2px 4px rgba(38, 27, 22, 0.85),
    0 3px 10px rgba(38, 27, 22, 0.6),
    0 8px 30px rgba(38, 27, 22, 0.5);
}

.hero-tagline {
  font-family: var(--font-serif-en);
  font-weight: 600;
  font-size: clamp(0.8rem, 2vw, 1rem);
  letter-spacing: 0.5em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-names {
  font-family: var(--font-serif-tc);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3.2rem);
  letter-spacing: 0.16em;
  line-height: 1.3;
}

.hero-names .amp {
  font-family: var(--font-serif-en);
  font-style: italic;
  font-weight: 400;
  font-size: 0.62em;
  margin-inline: 0.5em;
  opacity: 0.9;
}

.hero-parents {
  display: flex;
  justify-content: center;
  gap: clamp(1.6rem, 5vw, 3.2rem);
  margin-top: 1rem;
}

.hero-parents p {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  font-size: clamp(0.85rem, 2vw, 0.95rem);
  font-weight: 600;
  letter-spacing: 0.14em;
}

.hero-parents .parents-label {
  font-size: 0.72em;
  letter-spacing: 0.32em;
  text-indent: 0.32em; /* 平衡字距置中 */
  opacity: 0.95;
}

.hero-date {
  font-family: var(--font-serif-en);
  font-weight: 600;
  font-size: clamp(1.05rem, 2.6vw, 1.35rem);
  letter-spacing: 0.35em;
  margin-top: 1rem;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.9em;
}

.hero-weekday {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.68em;
  letter-spacing: 0.3em;
  opacity: 0.95;
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 1.4rem;
  transform: translateX(-50%);
  z-index: 2;
  color: var(--color-white);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.35em;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  opacity: 0.95;
  text-shadow:
    -1px -1px 0 rgba(38, 27, 22, 0.8),
    1px -1px 0 rgba(38, 27, 22, 0.8),
    -1px 1px 0 rgba(38, 27, 22, 0.8),
    1px 1px 0 rgba(38, 27, 22, 0.8),
    0 -1px 0 rgba(38, 27, 22, 0.8),
    0 1px 0 rgba(38, 27, 22, 0.8),
    -1px 0 0 rgba(38, 27, 22, 0.8),
    1px 0 0 rgba(38, 27, 22, 0.8),
    0 2px 8px rgba(38, 27, 22, 0.6);
}

/* 較矮的視窗：收起提示、卡片貼近底部 */
@media (max-height: 700px) {
  .scroll-hint {
    display: none;
  }

  .hero-content {
    margin-bottom: 3rem;
  }
}

.scroll-hint .scroll-cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-indent: 0.3em; /* 平衡字距置中 */
  animation: scroll-bob 1.8s ease-in-out infinite;
}

.scroll-hint .scroll-cta svg {
  width: 17px;
  height: 17px;
  filter: drop-shadow(0 1px 2px rgba(38, 27, 22, 0.8));
}

.scroll-hint .line {
  width: 1px;
  height: 34px;
  background: rgba(255, 255, 255, 0.7);
  overflow: hidden;
  position: relative;
}

.scroll-hint .line::after {
  content: "";
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-white);
  animation: scroll-line 2.2s var(--ease-soft) infinite;
}

/* ===== 照片占位框 ===== */
.photo-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--color-surface);
}

.photo-frame::before {
  content: "";
  display: block;
}

.photo-frame.ratio-3x4::before { padding-top: 133.33%; }
.photo-frame.ratio-4x3::before { padding-top: 75%; }
.photo-frame.ratio-1x1::before { padding-top: 100%; }

.photo-frame > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
  opacity: 0;
  transition: opacity 0.8s var(--ease-soft);
}

.photo-frame > img.is-loaded {
  opacity: 1;
}

.photo-frame > img.is-missing {
  display: none;
}

.ph-label {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
  padding: 1rem;
}

.ph-label .ph-en {
  font-family: var(--font-serif-en);
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
}

.ph-label .ph-path {
  font-family: Consolas, Menlo, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  padding: 0.25em 0.8em;
  border: 1px solid currentColor;
  border-radius: 999px;
  opacity: 0.9;
  white-space: nowrap;
  max-width: 94%;
  overflow: hidden;
  text-overflow: ellipsis;
}

.ph-label .ph-size {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  opacity: 0.8;
}

/* 各色卡 */
.ph-groom { background: var(--ph-groom); }
.ph-bride { background: var(--ph-bride); }
.ph-story-1 { background: var(--ph-story-1); }
.ph-story-2 { background: var(--ph-story-2); }
.ph-story-3 { background: var(--ph-story-3); }
.ph-story-4 { background: var(--ph-story-4); }
.ph-gallery-1 { background: var(--ph-gallery-1); }
.ph-gallery-2 { background: var(--ph-gallery-2); }
.ph-gallery-3 { background: var(--ph-gallery-3); }
.ph-gallery-4 { background: var(--ph-gallery-4); }
.ph-gallery-5 { background: var(--ph-gallery-5); }
.ph-gallery-6 { background: var(--ph-gallery-6); }

/* 淺色色卡文字改深色 */
.ph-story-1 .ph-label,
.ph-story-2 .ph-label,
.ph-story-3 .ph-label,
.ph-story-4 .ph-label {
  color: rgba(70, 58, 53, 0.55);
}

/* ===== 邀請文字 ===== */
.invitation {
  text-align: center;
}

.invitation-text {
  max-width: 34em;
  margin-inline: auto;
  font-size: clamp(1rem, 2.4vw, 1.15rem);
  letter-spacing: 0.12em;
  line-height: 2.3;
}

/* ===== 新人介紹 ===== */
.couple {
  background: var(--color-surface);
}

.couple-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.6rem, 4vw, 3.5rem);
  max-width: 860px;
  margin-inline: auto;
}

.couple-card {
  text-align: center;
}

.couple-card .photo-frame {
  box-shadow: var(--shadow-soft);
  margin-bottom: 1.6rem;
}

.couple-role {
  font-family: var(--font-serif-en);
  font-size: 0.78rem;
  letter-spacing: 0.4em;
  text-transform: uppercase;
  color: var(--color-secondary);
  margin-bottom: 0.4rem;
}

.couple-name {
  font-family: var(--font-serif-tc);
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: 0.2em;
  margin-bottom: 0.2rem;
}

.couple-name-en {
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--color-secondary);
  margin-bottom: 1rem;
}

.couple-intro {
  font-size: 0.92rem;
  line-height: 2;
  letter-spacing: 0.06em;
  max-width: 24em;
  margin-inline: auto;
}

/* ===== 愛情故事時間軸 ===== */
.story-timeline {
  position: relative;
  max-width: 760px;
  margin-inline: auto;
  padding-left: 0;
}

.story-timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: var(--color-line);
}

.story-item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(1.8rem, 5vw, 3.2rem);
  align-items: center;
  margin-bottom: clamp(2.8rem, 6vw, 4.2rem);
}

.story-item:last-child {
  margin-bottom: 0;
}

.story-item::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-background);
  border: 2px solid var(--color-primary);
  z-index: 2;
}

.story-item:nth-child(even) .story-media {
  order: 2;
}

.story-item:nth-child(even) .story-body {
  order: 1;
  text-align: right;
}

.story-media .photo-frame {
  box-shadow: var(--shadow-soft);
}

.story-date {
  font-family: var(--font-serif-en);
  font-size: 0.95rem;
  letter-spacing: 0.22em;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}

.story-title {
  font-family: var(--font-serif-tc);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: 0.15em;
  margin-bottom: 0.6rem;
}

.story-desc {
  font-size: 0.92rem;
  line-height: 2;
  letter-spacing: 0.05em;
}

/* ===== 婚禮倒數 ===== */
.countdown {
  background: linear-gradient(160deg, #f7efe6 0%, #efe1d3 100%);
  text-align: center;
}

.countdown-grid {
  display: flex;
  justify-content: center;
  gap: clamp(0.8rem, 3vw, 2rem);
  flex-wrap: wrap;
}

.countdown-cell {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  min-width: clamp(72px, 18vw, 120px);
  padding: clamp(1rem, 3vw, 1.8rem) 0.6rem;
}

.countdown-num {
  font-family: var(--font-serif-en);
  font-size: clamp(1.9rem, 6vw, 3rem);
  font-weight: 600;
  color: var(--color-heading);
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.countdown-unit {
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  color: var(--color-secondary);
  margin-top: 0.4rem;
}

.countdown-done {
  display: none;
  font-family: var(--font-serif-tc);
  font-size: clamp(1.2rem, 3.4vw, 1.6rem);
  letter-spacing: 0.2em;
  color: var(--color-heading);
}

.countdown.is-done .countdown-grid { display: none; }
.countdown.is-done .countdown-done { display: block; }

/* ===== 婚宴資訊 ===== */
.venue {
  background: var(--color-surface);
}

.venue-card {
  max-width: 640px;
  margin-inline: auto;
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-soft);
  padding: clamp(1.8rem, 5vw, 3rem);
  text-align: center;
}

.venue-date {
  font-family: var(--font-serif-en);
  font-size: clamp(1.5rem, 4vw, 2rem);
  letter-spacing: 0.24em;
  color: var(--color-heading);
}

.venue-weekday {
  font-size: 0.88rem;
  letter-spacing: 0.3em;
  color: var(--color-secondary);
  margin-top: 0.3rem;
  margin-bottom: 1.4rem;
}

.venue-times {
  display: flex;
  justify-content: center;
  gap: 2.4rem;
  padding-block: 1.2rem;
  border-block: 1px solid var(--color-line);
  margin-bottom: 1.5rem;
}

.venue-time-label {
  font-size: 0.78rem;
  letter-spacing: 0.25em;
  color: var(--color-secondary);
  margin-bottom: 0.2rem;
}

.venue-time-value {
  font-family: var(--font-serif-en);
  font-size: 1.4rem;
  color: var(--color-heading);
  letter-spacing: 0.08em;
}

.venue-name {
  font-family: var(--font-serif-tc);
  font-size: clamp(1.2rem, 3vw, 1.45rem);
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: 0.14em;
}

.venue-address,
.venue-phone {
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  margin-top: 0.5rem;
}

.venue-actions {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem;
  margin-top: 1.8rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  transition: transform 0.25s var(--ease-soft), box-shadow 0.25s, background 0.25s, color 0.25s;
  min-height: 48px;
}

.btn svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 6px 18px rgba(164, 124, 108, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(164, 124, 108, 0.45);
}

.btn-outline {
  border: 1px solid var(--color-primary);
  color: var(--color-primary);
  background: transparent;
}

.btn-outline:hover {
  background: var(--color-primary);
  color: var(--color-white);
  transform: translateY(-2px);
}

/* ===== 交通資訊 ===== */
.transport-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
  max-width: 860px;
  margin-inline: auto;
}

.transport-card {
  background: var(--color-white);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 1.6rem 1.5rem;
}

.transport-card h3 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: 0.12em;
  margin-bottom: 0.7rem;
}

.transport-card h3 svg {
  width: 19px;
  height: 19px;
  color: var(--color-primary);
  flex-shrink: 0;
}

.transport-card p {
  font-size: 0.88rem;
  line-height: 1.95;
  letter-spacing: 0.04em;
}

.transport-map {
  text-align: center;
  margin-top: 2rem;
}

/* ===== 相簿 ===== */
.gallery {
  background: var(--color-surface);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
  max-width: 920px;
  margin-inline: auto;
}

.gallery-item {
  padding: 0;
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.35s var(--ease-soft), box-shadow 0.35s;
  display: block;
  width: 100%;
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.gallery-hint {
  text-align: center;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--color-secondary);
  margin-top: 1.4rem;
}

/* 燈箱 */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(40, 30, 26, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease-soft), visibility 0.35s;
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox-stage {
  width: min(92vw, 760px);
  max-height: 84vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-stage .photo-frame {
  width: 100%;
  max-height: 84vh;
  border-radius: var(--radius);
}

.lightbox-img {
  max-width: 100%;
  max-height: 84vh;
  border-radius: var(--radius);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.lightbox-counter {
  position: absolute;
  top: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.8);
  font-family: var(--font-serif-en);
  letter-spacing: 0.3em;
  font-size: 0.85rem;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
  position: absolute;
  color: rgba(255, 255, 255, 0.85);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background 0.25s, color 0.25s;
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
  background: rgba(255, 255, 255, 0.14);
  color: var(--color-white);
}

.lightbox-close {
  top: 0.9rem;
  right: 0.9rem;
}

.lightbox-prev { left: 0.6rem; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 0.6rem; top: 50%; transform: translateY(-50%); }

.lightbox svg {
  width: 26px;
  height: 26px;
}

/* ===== 出席回覆 ===== */
.rsvp {
  text-align: center;
}

.rsvp-card {
  max-width: 560px;
  margin-inline: auto;
  background: linear-gradient(160deg, #fdf3e9 0%, #f7e5d4 100%);
  border: 1px solid #ecd5bf;
  border-radius: var(--radius);
  padding: clamp(1.8rem, 5vw, 2.8rem);
  box-shadow: var(--shadow-soft);
}

.rsvp-deadline {
  font-size: clamp(1.05rem, 2.8vw, 1.25rem);
  letter-spacing: 0.14em;
  margin-bottom: 0.6rem;
  color: var(--color-heading);
}

.rsvp-deadline strong {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 1.1em;
}

.rsvp-note {
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  opacity: 0.85;
  margin-bottom: 1.8rem;
}

.btn-rsvp-main {
  padding: 1rem 3rem;
  font-size: 1.02rem;
  animation: rsvp-glow 2.6s ease-in-out infinite;
}

/* 出席回覆快速按鈕（固定左下角） */
.rsvp-fab {
  position: fixed;
  left: 1.1rem;
  bottom: 1.2rem;
  z-index: 90;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0.72rem 1.3rem;
  border-radius: 999px;
  font-size: 0.88rem;
  letter-spacing: 0.14em;
  box-shadow: 0 8px 24px rgba(164, 124, 108, 0.45);
  transition: transform 0.3s var(--ease-soft), opacity 0.3s, visibility 0.3s;
  animation: rsvp-glow 2.6s ease-in-out infinite;
}

.rsvp-fab svg {
  width: 17px;
  height: 17px;
}

.rsvp-fab:hover {
  transform: translateY(-3px);
}

.rsvp-fab.is-hidden {
  opacity: 0;
  visibility: hidden;
}

/* 導覽列的出席回覆改為醒目膠囊 */
.nav-links a.nav-rsvp,
.site-nav.scrolled .nav-links a.nav-rsvp {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0.35rem 1rem;
  border-radius: 999px;
  opacity: 1;
}

.nav-links a.nav-rsvp:hover {
  background: #8f6a5b;
  color: var(--color-white);
}

/* ===== 注意事項 ===== */
.notes {
  background: var(--color-surface);
}

.notes-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
  max-width: 920px;
  margin-inline: auto;
}

.note-card {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
  border-top: 3px solid var(--color-secondary);
}

.note-card h3 {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--color-heading);
  letter-spacing: 0.16em;
  margin-bottom: 0.55rem;
}

.note-card p {
  font-size: 0.85rem;
  line-height: 1.95;
  letter-spacing: 0.04em;
}

/* ===== 頁尾 ===== */
.site-footer {
  background: linear-gradient(170deg, #57453d 0%, #3c2f29 100%);
  color: rgba(255, 250, 245, 0.85);
  text-align: center;
  padding-block: clamp(3.5rem, 8vw, 5.5rem) 2.2rem;
}

.footer-names {
  font-family: var(--font-serif-tc);
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  letter-spacing: 0.2em;
  color: var(--color-white);
}

.footer-names .amp {
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 0.7em;
  margin-inline: 0.4em;
}

.footer-date {
  font-family: var(--font-serif-en);
  letter-spacing: 0.3em;
  margin-top: 0.7rem;
  opacity: 0.85;
}

.footer-thanks {
  font-size: 0.9rem;
  letter-spacing: 0.14em;
  line-height: 2.1;
  margin-top: 1.6rem;
}

.footer-share {
  display: flex;
  justify-content: center;
  gap: 0.9rem;
  margin-top: 1.8rem;
}

.footer-share a,
.footer-share button {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.9);
  transition: background 0.3s, transform 0.3s;
}

.footer-share a:hover,
.footer-share button:hover {
  background: rgba(255, 255, 255, 0.14);
  transform: translateY(-2px);
}

.footer-share svg {
  width: 20px;
  height: 20px;
}

.footer-copy {
  margin-top: 2.4rem;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  opacity: 0.55;
}

/* ===== 浮動按鈕 ===== */
.floating-btns {
  position: fixed;
  right: 1.1rem;
  bottom: 1.2rem;
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.fab {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-white);
  color: var(--color-primary);
  box-shadow: 0 6px 20px rgba(70, 58, 53, 0.22);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.3s var(--ease-soft), opacity 0.3s, visibility 0.3s, background 0.3s;
}

.fab svg {
  width: 20px;
  height: 20px;
}

.fab:hover {
  transform: translateY(-3px);
}

#back-to-top {
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
}

#back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

#music-toggle.is-playing {
  background: var(--color-primary);
  color: var(--color-white);
}

#music-toggle.is-playing svg {
  animation: music-spin 3.5s linear infinite;
}

#music-toggle.is-unavailable {
  display: none;
}

/* 音樂播放提示泡泡 */
.music-hint {
  position: fixed;
  right: 1.1rem;
  bottom: 4.7rem;
  z-index: 95;
  background: rgba(255, 255, 255, 0.96);
  color: var(--color-primary);
  padding: 0.55rem 1.05rem;
  border-radius: 999px;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  box-shadow: 0 6px 20px rgba(70, 58, 53, 0.22);
  cursor: pointer;
  animation: hint-bob 2.2s ease-in-out infinite;
}

.music-hint[hidden] {
  display: none;
}

/* ===== 提示訊息 ===== */
.toast {
  position: fixed;
  left: 50%;
  bottom: 2rem;
  transform: translate(-50%, 20px);
  z-index: 300;
  background: rgba(70, 58, 53, 0.94);
  color: var(--color-white);
  padding: 0.7rem 1.6rem;
  border-radius: 999px;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s var(--ease-soft), transform 0.35s, visibility 0.35s;
  max-width: 88vw;
  text-align: center;
}

.toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* ===== 開啟喜帖動畫（自動播放的信封開場） =====
 * 時序（main.js 控制）：
 *  1. .is-open  蠟封淡出、信封蓋往上翻
 *  2. .is-out   卡片從信封中抽出，信封向下退出畫面
 *  3. .is-zoom  卡片放大並淡出，轉場成整個頁面
 *  4. .is-done  整個開場畫面淡出
 */
.envelope-screen {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: linear-gradient(160deg, #fffaf5 0%, #f2e2d0 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 1s var(--ease-soft), visibility 1s;
}

.envelope-screen.is-done {
  opacity: 0;
  visibility: hidden;
}

.envelope {
  position: relative;
  width: min(86vw, 400px);
  aspect-ratio: 10 / 7;
  animation: env-float-in 1.1s var(--ease-soft) both;
}

/* 信封底（上半是信封內側，開蓋後可見） */
.env-shell {
  position: absolute;
  inset: 0;
  border-radius: 10px;
  background: linear-gradient(180deg, #c8ab8d 0%, #d9c1a6 38%, #e9d6c3 60%);
  box-shadow: 0 24px 50px rgba(70, 58, 53, 0.3);
  transition: transform 1s cubic-bezier(0.5, 0, 0.75, 0.4);
}

/* 內卡 */
.env-letter {
  position: absolute;
  left: 5%;
  right: 5%;
  top: 6%;
  bottom: 8%;
  background: linear-gradient(170deg, #ffffff 0%, #fff8f0 100%);
  border-radius: 8px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  text-align: center;
  padding: 1rem;
  box-shadow: 0 6px 22px rgba(70, 58, 53, 0.16);
  will-change: transform, opacity;
  opacity: 0; /* 信封闔上時完全看不到卡片，開蓋時才浮現 */
  transition: transform 1s var(--ease-soft), opacity 0.7s ease 0.35s;
}

.env-letter::after {
  /* 卡片邊框裝飾 */
  content: "";
  position: absolute;
  inset: 7px;
  border: 1px solid var(--color-line);
  border-radius: 6px;
  pointer-events: none;
}

.env-letter-en {
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  color: var(--color-secondary);
}

.env-letter-names {
  font-family: var(--font-serif-tc);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: 0.18em;
  color: var(--color-heading);
}

.env-letter-date {
  font-family: var(--font-serif-en);
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--color-primary);
}

/* 信封前袋 */
.env-pocket {
  position: absolute;
  inset: 0;
  z-index: 3;
  background: linear-gradient(180deg, #eedcc9 0%, #e0c8ae 100%);
  clip-path: polygon(0 30%, 50% 64%, 100% 30%, 100% 100%, 0 100%);
  border-radius: 10px;
  filter: drop-shadow(0 -2px 4px rgba(70, 58, 53, 0.08));
  transition: transform 1s cubic-bezier(0.5, 0, 0.75, 0.4);
}

/* 信封蓋（開啟時往上翻） */
.env-flap {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 62%;
  z-index: 4;
  background: linear-gradient(180deg, #e7d3bd 0%, #d9bfa2 100%);
  clip-path: polygon(0 0, 100% 0, 50% 100%);
  border-radius: 10px 10px 0 0;
  transform-origin: top center;
  backface-visibility: visible;
  transition: transform 1.1s cubic-bezier(0.6, 0, 0.3, 1), z-index 0s 0.55s,
              filter 1.1s;
}

/* 蠟封 */
.env-seal {
  position: absolute;
  left: 50%;
  top: 62%;
  transform: translate(-50%, -50%);
  z-index: 5;
  width: 66px;
  height: 66px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #b98d78 0%, #96685a 70%);
  color: #fff7ee;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif-en);
  font-style: italic;
  font-size: 1.15rem;
  letter-spacing: 0.04em;
  box-shadow: 0 4px 14px rgba(90, 60, 45, 0.4), inset 0 0 0 3px rgba(255, 247, 238, 0.25);
  transition: transform 0.6s var(--ease-soft), opacity 0.6s;
}

/* --- 1. 開蓋 --- */
.envelope.is-open .env-letter {
  opacity: 1;
}

.envelope.is-open .env-flap {
  transform: rotateX(178deg);
  z-index: 1;
  filter: brightness(0.94);
}

.envelope.is-open .env-seal {
  opacity: 0;
  transform: translate(-50%, -50%) scale(0.35) rotate(-18deg);
}

/* --- 2. 卡片抽出、信封向下退場 --- */
.envelope.is-out .env-letter {
  transform: translateY(-72%) scale(1.08);
}

.envelope.is-out .env-shell,
.envelope.is-out .env-pocket,
.envelope.is-out .env-flap {
  transform: translateY(130vh);
}

.envelope.is-out .env-flap {
  transform: rotateX(178deg) translateY(-130vh); /* 翻轉座標系下的向下 */
}

/* --- 3. 卡片放大轉場成頁面 --- */
.envelope.is-zoom .env-letter {
  transform: translateY(-10%) scale(6.5);
  opacity: 0;
  transition: transform 1.15s cubic-bezier(0.45, 0, 0.2, 1), opacity 0.75s ease 0.35s;
}

/* 無障礙：鍵盤焦點 */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}