:root {
  --background: #f8f7f1;
  --foreground: #18130e;
  --card: #fdfefb;
  --primary: #7b1e14;
  --primary-foreground: #f8f8f4;
  --secondary: #eae3d9;
  --muted: #e9e7e2;
  --muted-foreground: #6a615b;
  --accent: #ebd1c4;
  --border: #cbc3bb;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC",
    "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-serif-cn: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif CJK SC",
    "SimSun", "STZhongsong", serif;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--background);
  color: var(--foreground);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

button { font-family: inherit; }

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

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 88px;
  padding: 14px clamp(20px, 5vw, 76px);
  background: rgba(249, 246, 239, 0.88);
  border-bottom: 1px solid rgba(48, 35, 27, 0.14);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 13px;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  text-align: left;
  cursor: pointer;
}

.brand-lockup strong {
  display: block;
  font-family: var(--font-serif-cn);
  font-size: 20px;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.brand-lockup small {
  display: block;
  margin-top: 3px;
  font-size: 10px;
  letter-spacing: 0.13em;
  color: var(--muted-foreground);
}

.brand-seal {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: #fff;
  border-radius: 2px;
  font-family: var(--font-serif-cn);
  font-size: 17px;
  letter-spacing: 0.08em;
  writing-mode: vertical-rl;
}

.header-note {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted-foreground);
}

/* ---------- Layout ---------- */
.home-view,
.album-view {
  width: min(1500px, 100% - 40px);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 96px) 0 80px;
}

.album-view { padding-top: clamp(32px, 5vw, 68px); }

.site-footer {
  padding: 40px 0 56px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted-foreground);
  border-top: 1px solid rgba(48, 35, 27, 0.1);
}

.site-footer strong {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-serif-cn);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--foreground);
}

/* ---------- Home intro ---------- */
.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.7fr);
  align-items: end;
  gap: 48px;
  margin-bottom: clamp(48px, 7vw, 90px);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: 0.18em;
  color: var(--primary);
}

.intro h1,
.album-heading h1 {
  margin: 0;
  font-family: var(--font-serif-cn);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.intro h1 { font-size: clamp(42px, 6.3vw, 92px); line-height: 1.08; }

.intro-copy { border-left: 1px solid var(--border); padding-left: 26px; }

.intro-copy p {
  max-width: 28em;
  margin: 0 0 24px;
  font-family: var(--font-serif-cn);
  font-size: 18px;
  line-height: 1.85;
}

.intro-copy span {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted-foreground);
}

/* ---------- Style grid ---------- */
.style-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(30px, 4vw, 64px) clamp(18px, 2.5vw, 40px);
}

.style-card {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
}

.style-number {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 3;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: #fff;
  background: rgba(25, 19, 16, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.55);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.preview-stack {
  display: grid;
  grid-template-columns: 1.65fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 3px;
  height: clamp(300px, 34vw, 520px);
  background: var(--secondary);
  overflow: hidden;
}

.preview-stack span { position: relative; overflow: hidden; }
.preview-stack .preview-1 { grid-row: 1 / 3; }

.preview-stack img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.7s cubic-bezier(0.2, 0.8, 0.2, 1), filter 0.5s;
}

.style-card:hover .preview-stack img { filter: saturate(1.04); transform: scale(1.025); }

.style-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 19px 1px 0;
}

.style-meta strong {
  display: block;
  font-family: var(--font-serif-cn);
  font-size: clamp(19px, 1.6vw, 25px);
  font-weight: 600;
  letter-spacing: 0.04em;
}

.style-meta small {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  color: var(--muted-foreground);
}

.style-arrow {
  font-family: var(--font-serif-cn);
  font-size: 25px;
  color: var(--primary);
  transition: transform 0.25s;
}

.style-card:hover .style-arrow { transform: translate(3px, -3px); }

/* ---------- Album ---------- */
.album-heading { margin-bottom: clamp(34px, 5vw, 64px); }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 54px;
  padding: 8px 0;
  border: 0;
  background: none;
  font-size: 14px;
  color: var(--muted-foreground);
  cursor: pointer;
}

.back-link svg { width: 17px; }

.album-title-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.album-title-row h1 { font-size: clamp(38px, 5vw, 72px); }

.album-title-row p {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 9px;
  font-size: 14px;
  color: var(--muted-foreground);
}

.album-title-row p svg { width: 17px; }

.album-instruction {
  margin: 24px 0 0;
  font-size: 14px;
  color: var(--muted-foreground);
}

.photo-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(28px, 3vw, 48px) clamp(12px, 2vw, 28px);
}

.photo-card {
  display: flex;
  flex-direction: column;
  gap: 13px;
  min-width: 0;
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  cursor: zoom-in;
}

.photo-frame {
  position: relative;
  aspect-ratio: 4 / 5;
  background: var(--secondary);
  overflow: hidden;
}

.photo-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.photo-card:hover .photo-frame img { transform: scale(1.025); }

.photo-code {
  align-self: center;
  padding-bottom: 4px;
  font-size: 15px;
  font-weight: 650;
  letter-spacing: 0.14em;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}

.photo-card:hover .photo-code { border-color: var(--primary); }

/* ---------- Lightbox ---------- */
.viewer {
  position: fixed;
  inset: 0;
  z-index: 50;
  width: 100vw;
  height: 100dvh;
  background: #141210;
  color: #fff;
  overflow: hidden;
}

.viewer-topbar {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 16px 20px;
  background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0));
}

.viewer-topbar span { font-size: 15px; font-weight: 650; letter-spacing: 0.16em; }

.viewer-topbar button,
.viewer-nav {
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: rgba(20, 18, 16, 0.52);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  cursor: pointer;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.viewer-topbar button { width: 42px; height: 42px; }
.viewer-topbar button svg { width: 20px; }

.viewer-stage {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 70px clamp(14px, 6vw, 90px) 54px;
}

.viewer-stage > img {
  position: relative;
  z-index: 2;
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
}

.viewer-nav {
  position: absolute;
  top: 50%;
  z-index: 5;
  width: 48px;
  height: 48px;
  transform: translateY(-50%);
}

.viewer-nav svg { width: 22px; }
.viewer-prev { left: 18px; }
.viewer-next { right: 18px; }

.viewer-count {
  position: absolute;
  left: 50%;
  bottom: 16px;
  z-index: 5;
  transform: translateX(-50%);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.75);
}

.viewer-loading {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- Loading ---------- */
.loading-state {
  display: grid;
  place-items: center;
  min-height: 60vh;
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--muted-foreground);
}

/* ---------- Responsive ---------- */
@media (max-width: 1100px) {
  .site-header { min-height: 74px; padding: 11px 16px; }
  .style-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .photo-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .intro { grid-template-columns: minmax(0, 1fr) minmax(220px, 0.6fr); gap: 32px; }
}

@media (max-width: 720px) {
  .brand-lockup small,
  .header-note { display: none; }
  .home-view,
  .album-view { width: calc(100% - 28px); padding-top: 38px; }
  .intro { display: block; margin-bottom: 48px; }
  .intro h1 { font-size: clamp(40px, 13vw, 58px); }
  .intro-copy { margin-top: 32px; padding-left: 18px; }
  .intro-copy p { font-size: 16px; }
  .style-grid { grid-template-columns: 1fr; gap: 44px; }
  .preview-stack { height: min(112vw, 490px); }
  .photo-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 10px; }
  .back-link { margin-bottom: 36px; }
  .album-title-row { align-items: flex-start; }
  .album-title-row h1 { font-size: 38px; }
  .album-title-row p { white-space: nowrap; margin-top: 31px; }
  .photo-code { font-size: 14px; }
  .viewer-nav { width: 42px; height: 42px; top: auto; bottom: 14px; transform: none; }
  .viewer-prev { left: 20px; }
  .viewer-next { right: 20px; }
  .viewer-count { bottom: 26px; }
  .viewer-stage { padding-inline: 0; }
}