/* ============ 奶奶纪念相册 — 温馨纪念风 ============ */
:root {
  --bg: #f5efe2;
  --bg-deep: #ece0c8;
  --ink: #4a3728;
  --ink-soft: #6f5b45;
  --accent: #b3894f;
  --accent-deep: #8f6c3a;
  --card: #fffdf7;
  --line: #e3d6bf;
  --serif: "Songti SC", "STSong", "Noto Serif SC", "SimSun", serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body.no-scroll { overflow: hidden; }

/* ============ 封面 ============ */
.hero {
  position: relative;
  min-height: 88vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(160deg, #f8f1e3 0%, #efe2c8 52%, #e2cda4 100%);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.4) 0%, rgba(255, 255, 255, 0) 62%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  z-index: 1;
  padding: 2rem;
  animation: fadeUp 1.2s ease both;
}
.hero-eyebrow {
  font-size: 0.95rem;
  letter-spacing: 0.6em;
  color: var(--accent-deep);
  margin-bottom: 1.2rem;
}
.hero-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2.3rem, 6vw, 4.6rem);
  letter-spacing: 0.12em;
  color: var(--ink);
  line-height: 1.3;
}
.hero-divider {
  width: 84px;
  height: 2px;
  margin: 1.8rem auto;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.hero-subtitle {
  font-family: var(--serif);
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  letter-spacing: 0.2em;
  color: var(--ink-soft);
}
.hero-note {
  margin-top: 0.8rem;
  font-size: 0.9rem;
  letter-spacing: 0.25em;
  color: var(--accent-deep);
}
.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--accent-deep);
  font-size: 1.4rem;
  animation: bounce 2s infinite;
  opacity: 0.7;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes bounce {
  0%, 100% { transform: translate(-50%, 0); }
  50% { transform: translate(-50%, 8px); }
}

/* ============ 时间轴 ============ */
.timeline {
  max-width: 1280px;
  margin: 0 auto;
  padding: 4rem 2rem 2rem;
}
.year {
  margin-bottom: 4.5rem;
}
.year-title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.7rem;
  color: var(--ink);
  text-align: center;
  letter-spacing: 0.15em;
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2rem;
}
.year-title::before,
.year-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line));
}
.year-title::after {
  background: linear-gradient(90deg, var(--line), transparent);
}

/* ============ 照片横排（等高行，不裁切） ============ */
.grid {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: center;
}
.photo {
  position: relative;
  flex: 0 0 auto;
  height: 260px;
  max-width: 100%;
  border-radius: 10px;
  overflow: hidden;
  background: var(--card);
  box-shadow: 0 2px 10px rgba(74, 55, 40, 0.12);
  cursor: zoom-in;
  animation: fadeUp 0.6s ease both;
}
.photo img {
  height: 100%;
  width: auto;
  display: block;
  transition: transform 0.5s ease;
}
.photo:hover img { transform: scale(1.045); }
.photo:hover { box-shadow: 0 8px 26px rgba(74, 55, 40, 0.22); }
.caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 22px 14px 10px;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.58));
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}
.photo:hover .caption { opacity: 1; }

@media (max-width: 820px) { .photo { height: 220px; } }
@media (max-width: 520px) { .photo { height: 200px; } }

/* ============ 视频 ============ */
.video-grid {
  max-width: 860px;
  margin: 2rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.video {
  border-radius: 10px;
  overflow: hidden;
  background: var(--card);
  box-shadow: 0 2px 10px rgba(74, 55, 40, 0.12);
}
.video video {
  display: block;
  width: 100%;
  background: #000;
}
.video-caption {
  padding: 12px 16px;
  text-align: center;
  font-size: 0.9rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

/* ============ 页脚 ============ */
.footer {
  text-align: center;
  padding: 3rem 2rem 4rem;
  color: var(--ink-soft);
}
.footer-divider {
  width: 64px;
  height: 2px;
  margin: 0 auto 1.6rem;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}
.footer p {
  font-family: var(--serif);
  letter-spacing: 0.25em;
  font-size: 1rem;
}

/* ============ 灯箱 ============ */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(22, 15, 8, 0.94);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.lightbox[hidden] { display: none; }
.lb-img {
  max-width: 92vw;
  max-height: 82vh;
  border-radius: 5px;
  box-shadow: 0 12px 60px rgba(0, 0, 0, 0.55);
  animation: fadeUp 0.25s ease;
}
.lb-close,
.lb-prev,
.lb-next {
  position: fixed;
  border: none;
  background: none;
  color: #e8dcc8;
  cursor: pointer;
  line-height: 1;
  z-index: 1001;
  transition: color 0.2s;
}
.lb-close:hover,
.lb-prev:hover,
.lb-next:hover { color: #fff; }
.lb-close {
  top: 16px;
  right: 20px;
  font-size: 2.4rem;
  padding: 6px 12px;
}
.lb-prev {
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3.2rem;
  padding: 10px 18px;
}
.lb-next {
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 3.2rem;
  padding: 10px 18px;
}
.lb-caption {
  position: fixed;
  bottom: 24px;
  left: 0;
  right: 0;
  text-align: center;
  color: #e8dcc8;
  font-size: 0.98rem;
  letter-spacing: 0.1em;
}
.lb-counter {
  position: fixed;
  top: 22px;
  left: 0;
  right: 0;
  text-align: center;
  color: rgba(232, 220, 200, 0.72);
  font-size: 0.85rem;
  letter-spacing: 0.2em;
}

@media (max-width: 640px) {
  .lb-prev { left: 4px; font-size: 2.4rem; padding: 8px 10px; }
  .lb-next { right: 4px; font-size: 2.4rem; padding: 8px 10px; }
  .lb-img { max-width: 96vw; max-height: 76vh; }
}