:root{
  --paper: #f1efe8;
  --card: #ffffff;
  --ink: #2c2c2a;
  --ink-soft: #6a6963;
  --ink-faint: #99978f;
  --line: #ddd9cf;
  --pad: clamp(18px, 4vw, 56px);
}

*{ box-sizing: border-box; }

html{ -webkit-text-size-adjust: 100%; }

body{
  margin: 0;
  min-height: 100%;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
               "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 顶部 ---------- */
.head{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: max(26px, env(safe-area-inset-top)) var(--pad) 18px;
}

.brand{ display: flex; align-items: center; gap: 10px; }

.brand-link{ display: flex; align-items: center; }
.brand-link img{ display: block; height: 28px; width: auto; }
.brand .brand-mark{ display: none; }

.brand-title{
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  letter-spacing: .02em;
}

.brand-count{
  font-size: 12px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
}

/* 导航胶囊：与首页同一套形状与尺寸，只把配色换成浅色版 */
.nav{
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, .62);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.nav a{
  display: block;
  padding: 7px 16px;
  border-radius: 999px;
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: .06em;
  transition: background .2s ease, color .2s ease;
}

.nav a:hover,
.nav a:focus-visible{
  background: rgba(44, 44, 42, .08);
  color: var(--ink);
}

.nav a.is-current{
  background: rgba(44, 44, 42, .10);
  color: var(--ink);
}

/* ---------- 照片墙 ---------- */
.wall{
  column-count: 3;
  column-gap: clamp(14px, 2vw, 26px);
  padding: 6px var(--pad) 40px;
}

@media (max-width: 1100px){ .wall{ column-count: 2; } }
@media (max-width: 620px){ .wall{ column-count: 1; } }

/* 窄屏：四个入口一行放不下，「来信」收成只剩信封图标 */
@media (max-width: 620px){
  .nav a{ padding: 6px 11px; font-size: 12.5px; letter-spacing: .02em; }
  .nav a.nav-mail{ gap: 0; padding: 6px 9px; }
  .nav-mail-label{ display: none; }
  /* 锁定组合太宽，窄屏只留记号 */
  .brand .brand-lockup{ display: none; }
  .brand .brand-mark{ display: block; height: 22px; }
}

.shot{
  break-inside: avoid;
  display: block;
  width: 100%;
  margin: 0 0 clamp(14px, 2vw, 26px);
  padding: 10px 10px 0;
  border: 0;
  border-radius: 2px;
  background: var(--card);
  box-shadow: 0 1px 2px rgba(44,44,42,.10), 0 6px 18px rgba(44,44,42,.07);
  cursor: zoom-in;
  text-align: left;
  font: inherit;
  color: inherit;
  transform: rotate(var(--tilt, 0deg));
  transition: transform .28s cubic-bezier(.2,.7,.2,1), box-shadow .28s ease;
}

.shot:hover,
.shot:focus-visible{
  transform: rotate(0deg) translateY(-3px);
  box-shadow: 0 2px 4px rgba(44,44,42,.12), 0 14px 30px rgba(44,44,42,.13);
  outline: none;
}

.shot img{
  display: block;
  width: 100%;
  height: auto;
  background: #e9e6dd;
  border-radius: 1px;
}

.shot figcaption{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  padding: 10px 2px 12px;
  font-size: 12px;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.shot .shot-date{ color: var(--ink-soft); }

/* ---------- 空状态 / 页脚 ---------- */
.empty{
  padding: 40px var(--pad);
  color: var(--ink-faint);
  font-size: 14px;
}

.foot{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  padding: 18px var(--pad) max(30px, env(safe-area-inset-bottom));
  font-size: 12px;
  color: var(--ink-faint);
  border-top: 1px solid var(--line);
  margin-top: 10px;
}

/* ---------- 导航末尾的来信入口 ---------- */
.nav a.nav-mail{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px 7px 12px;
}

.nav a.nav-mail svg{
  width: 12px;
  height: 12px;
  flex: none;
  opacity: .75;
}

/* ---------- 灯箱 ---------- */
.lb{
  border: 0;
  padding: 0;
  width: 100vw;
  max-width: 100vw;
  height: 100vh;
  max-height: 100vh;
  background: rgba(24,24,22,.94);
  color: #fff;
}

.lb::backdrop{ background: rgba(24,24,22,.94); }

.lb[open]{ display: grid; grid-template-rows: auto 1fr auto; }

.lb-bar{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px clamp(16px, 3vw, 28px);
  font-size: 12.5px;
  color: rgba(255,255,255,.72);
  font-variant-numeric: tabular-nums;
}

.lb-close{
  border: 0;
  background: transparent;
  color: rgba(255,255,255,.8);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
}

.lb-close:hover{ color: #fff; }

.lb-img{
  align-self: center;
  justify-self: center;
  max-width: min(94vw, 1600px);
  max-height: calc(100vh - 150px);
  width: auto;
  height: auto;
  object-fit: contain;
}

.lb-tools{
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  padding: 16px 0 max(20px, env(safe-area-inset-bottom));
}

.lb-nav{
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  padding-bottom: 3px;
  border: 1px solid rgba(255,255,255,.28);
  border-radius: 50%;
  background: transparent;
  color: #fff;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, opacity .2s ease;
}

.lb-nav:hover:not(:disabled){
  background: rgba(255,255,255,.14);
  border-color: rgba(255,255,255,.5);
}

.lb-nav:disabled{ opacity: .25; cursor: default; }

.lb-pos{
  min-width: 4.5em;
  text-align: center;
  font-size: 12px;
  color: rgba(255,255,255,.6);
  font-variant-numeric: tabular-nums;
}

@media (prefers-reduced-motion: reduce){
  .shot, .shot:hover{ transition: none; transform: none; }
  .shot{ transform: none; }
}