/* === 变量与重置 === */
:root {
  --bg: #fdf6f0;
  --ink: #3a2a2e;
  --rose: #c14a6b;
  --rose-soft: #e89aae;
  --paper: #fffaf5;
  --shadow: 0 8px 32px rgba(58, 42, 46, 0.12);
  --serif-zh: "Songti SC", "STSong", "Hiragino Sans GB", "PingFang SC", "Microsoft YaHei", serif;
  --serif-en: "Cormorant Garamond", "Times New Roman", Georgia, serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif-zh);
  line-height: 1.6;
  overflow-x: hidden;
}
img, picture { display: block; max-width: 100%; }
button { background: none; border: none; color: inherit; cursor: pointer; font: inherit; }

/* === 封面区 === */
.cover {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  overflow: hidden;
  color: #fff;
  text-align: center;
  padding: 4rem 1.5rem;
}
.cover__bg, .cover__bg img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover;
  filter: brightness(0.55) blur(2px);
  z-index: 0;
}
.cover__overlay {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, rgba(0,0,0,0) 0%, rgba(0,0,0,0.35) 100%);
  z-index: 1;
}
.cover__content {
  position: relative;
  z-index: 2;
  max-width: 90vw;
  animation: fadeUp 1.2s ease-out 0.2s both;
}
.cover__title {
  font-family: var(--serif-en);
  font-weight: 500;
  font-size: clamp(2.5rem, 9vw, 6rem);
  letter-spacing: 0.04em;
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 12px rgba(0,0,0,0.3);
}
.cover__title .amp {
  color: var(--rose-soft);
  font-style: italic;
  font-weight: 400;
  margin: 0 0.2em;
}
.cover__poem {
  font-size: clamp(1rem, 2.2vw, 1.35rem);
  letter-spacing: 0.15em;
  font-weight: 300;
  margin-bottom: 2.5rem;
  opacity: 0.92;
  text-shadow: 0 1px 6px rgba(0,0,0,0.4);
}
.cover__counter {
  font-size: clamp(0.85rem, 1.8vw, 1.05rem);
  letter-spacing: 0.08em;
  opacity: 0.85;
}
.counter__prefix { margin-right: 0.5em; }
.counter__nums { font-variant-numeric: tabular-nums; }
.counter__nums span { color: var(--rose-soft); font-weight: 500; min-width: 1.2em; display: inline-block; text-align: center; }

.cover__scroll {
  position: absolute;
  bottom: 2rem; left: 50%; transform: translateX(-50%);
  z-index: 2;
  color: #fff;
  opacity: 0.7;
  animation: bob 2s ease-in-out infinite;
}
.cover__scroll:hover { opacity: 1; }

/* === 相册区 === */
.gallery {
  padding: 6rem 1.5rem;
  max-width: 1400px;
  margin: 0 auto;
}
.gallery__grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(4, 1fr);
}
.gallery__item {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: 4px;
  background: var(--paper);
  box-shadow: var(--shadow);
  cursor: zoom-in;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out, box-shadow 0.3s;
}
.gallery__item.is-visible { opacity: 1; transform: translateY(0); }
.gallery__item:hover { box-shadow: 0 12px 36px rgba(193, 74, 107, 0.25); }
.gallery__item img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s ease;
}
.gallery__item:hover img { transform: scale(1.04); }

@media (max-width: 1200px) { .gallery__grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 768px)  { .gallery__grid { grid-template-columns: repeat(2, 1fr); } .gallery { padding: 4rem 1rem; } }
@media (max-width: 480px)  { .gallery__grid { grid-template-columns: 1fr; gap: 1rem; } }

/* === 页脚 === */
.footer {
  text-align: center;
  padding: 4rem 1.5rem 6rem;
  color: var(--rose);
  font-family: var(--serif-en);
  font-style: italic;
  font-size: 1.1rem;
  letter-spacing: 0.06em;
}
.heart-inline { color: var(--rose); }

/* === Lightbox === */
.lightbox {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0, 0, 0, 0.92);
  display: grid; place-items: center;
  animation: fadeIn 0.2s ease-out;
}
.lightbox[hidden] { display: none; }
.lightbox__pic, .lightbox__pic img {
  max-width: 95vw; max-height: 95vh;
  object-fit: contain;
}
.lightbox__close, .lightbox__prev, .lightbox__next {
  position: absolute;
  color: #fff;
  font-size: 2.5rem;
  width: 3rem; height: 3rem;
  display: grid; place-items: center;
  opacity: 0.6;
  transition: opacity 0.2s;
}
.lightbox__close { top: 1rem; right: 1rem; }
.lightbox__prev  { top: 50%; left: 1rem;  transform: translateY(-50%); }
.lightbox__next  { top: 50%; right: 1rem; transform: translateY(-50%); }
.lightbox__close:hover, .lightbox__prev:hover, .lightbox__next:hover { opacity: 1; }

/* === 音乐按钮 === */
.music-btn {
  position: fixed; right: 1.5rem; bottom: 1.5rem;
  z-index: 50;
  width: 3rem; height: 3rem;
  border-radius: 50%;
  background: var(--rose);
  color: #fff;
  box-shadow: 0 4px 16px rgba(193,74,107,0.45);
  font-size: 1.1rem;
  display: grid; place-items: center;
  transition: transform 0.2s, box-shadow 0.2s;
}
.music-btn:hover { transform: scale(1.08); }
.music-btn.is-playing { background: var(--rose-soft); }

/* === 飘落爱心 === */
.heart-fall {
  position: fixed;
  top: -2rem;
  z-index: 1;
  pointer-events: none;
  color: var(--rose-soft);
  font-size: 1rem;
  opacity: 0.7;
  will-change: transform, opacity;
  animation: fall linear forwards;
}

/* === 动画 === */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}
@keyframes bob {
  0%, 100% { transform: translate(-50%, 0); }
  50%      { transform: translate(-50%, 8px); }
}
@keyframes fall {
  0%   { transform: translateY(0) translateX(0) rotate(0deg); opacity: 0.7; }
  90%  { opacity: 0.7; }
  100% { transform: translateY(110vh) translateX(var(--sway, 30px)) rotate(360deg); opacity: 0; }
}

/* === 用户偏好：减弱动效 === */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .heart-fall { display: none !important; }
  .cover__scroll { animation: none; }
}