:root {
  --page-bg: #F4E4CC;
  --section-bg-a: #EAD2A8;
  --section-bg-b: #D9C4A5;
  --card-bg: #FFF8EF;
  --accent: #8B5A2B;
  --text-primary: #3E2B1E;
  --border: #C8B08C;
  --status-new: #E63946;
  --status-archived: #2A9D8F;
  --status-updating: #F4A261;
  --tag-60s: #F4A460;
  --tag-70s: #8FBC8F;
  --tag-80s: #87CEEB;
  --tag-90s: #DDA0DD;
  --title-font: Kaiti SC, STKaiti, 楷体, cursive;
  --body-font: Songti SC, SimSun, Noto Serif SC, serif;
  --base-size: 16px;
  --container-width: 1200px;
  --radius-sm: 10px;
  --radius-md: 18px;
  --radius-lg: 28px;
  --radius-pill: 999px;
  --shadow-sm: 0 2px 8px rgba(62, 43, 30, 0.08);
  --shadow-md: 0 6px 20px rgba(62, 43, 30, 0.14);
}

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

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

body {
  min-height: 100vh;
  font-family: var(--body-font);
  font-size: var(--base-size);
  line-height: 1.75;
  color: var(--text-primary);
  background: var(--page-bg);
  background-image:
    linear-gradient(to right, rgba(139, 90, 43, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(139, 90, 43, 0.055) 1px, transparent 1px);
  background-size: 24px 24px;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
  background: none;
  border: none;
}

ul,
ol {
  list-style: none;
}

a {
  color: inherit;
  text-decoration: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--title-font);
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
}

p {
  margin-bottom: 1rem;
}

:focus-visible {
  outline: 3px solid var(--status-updating);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: 1rem;
}

.main-content {
  padding: 2rem 0 3rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 200;
  padding: 0.5rem 1.1rem;
  background: var(--page-bg);
  color: var(--accent);
  border-radius: 0 0 12px 12px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--accent);
  color: var(--page-bg);
  box-shadow: 0 2px 12px rgba(62, 43, 30, 0.22);
}

.header-top {
  position: relative;
}

.header-top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.9rem;
  padding-bottom: 0.9rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  min-width: 0;
}

.brand-seal {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  background: var(--page-bg);
  color: var(--accent);
  border: 2px solid rgba(244, 228, 204, 0.6);
  font-family: var(--title-font);
  font-size: 1.4rem;
  font-weight: 700;
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 0.12rem;
  min-width: 0;
}

.brand-name {
  font-family: var(--title-font);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--card-bg);
  white-space: nowrap;
}

.brand-tagline {
  font-size: 0.85rem;
  color: rgba(244, 228, 204, 0.78);
  letter-spacing: 0.03em;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-coords {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.08rem;
}

.coord-line {
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(244, 228, 204, 0.62);
  white-space: nowrap;
}

.progress-bar {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: var(--status-new);
  z-index: 120;
  pointer-events: none;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(244, 228, 204, 0.4);
  color: var(--page-bg);
  font-family: var(--body-font);
  font-size: 0.9rem;
  line-height: 1.2;
}

.nav-toggle-box {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
}

.nav-toggle-line {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  margin: 2.5px 0;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle-text {
  font-size: 0.88rem;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-nav {
  background: rgba(0, 0, 0, 0.14);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.35rem;
  padding-bottom: 0.35rem;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-pill);
  color: var(--page-bg);
  font-size: 0.95rem;
  line-height: 1.25;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.nav-link:hover {
  background: rgba(244, 228, 204, 0.16);
}

.nav-link[aria-current="page"],
.nav-link.is-active {
  background: var(--page-bg);
  color: var(--accent);
  font-weight: 700;
}

.nav-link-index {
  font-size: 0.7rem;
  opacity: 0.7;
  letter-spacing: 0.04em;
}

.nav-link-label {
  line-height: inherit;
}

.nav-status {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.site-footer {
  background: var(--accent);
  color: var(--page-bg);
  margin-top: 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.6fr;
  gap: 2rem;
  padding-block: 2.8rem;
}

.footer-brand {
  display: flex;
  align-items: flex-start;
  gap: 0.8rem;
}

.footer-brand .brand-seal {
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.2rem;
}

.footer-brand .brand-name {
  font-size: 1.3rem;
}

.footer-col {
  min-width: 0;
}

.footer-heading {
  font-family: var(--title-font);
  font-size: 1.05rem;
  margin-bottom: 0.85rem;
  color: var(--card-bg);
}

.footer-list li,
.footer-contact-list li {
  margin-bottom: 0.45rem;
  font-size: 0.9rem;
  line-height: 1.5;
}

.footer-list a {
  color: rgba(244, 228, 204, 0.85);
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.footer-list a:hover {
  color: #fff;
  padding-left: 3px;
}

.footer-contact-list li {
  color: rgba(244, 228, 204, 0.85);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding-block: 1.1rem;
  border-top: 1px solid rgba(244, 228, 204, 0.2);
  font-size: 0.85rem;
  color: rgba(244, 228, 204, 0.72);
}

.footer-copy {
  letter-spacing: 0.02em;
}

.footer-icp {
  letter-spacing: 0.06em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent);
  background: var(--card-bg);
  color: var(--accent);
  font-family: var(--body-font);
  font-size: 0.95rem;
  line-height: 1.3;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--primary {
  background: var(--accent);
  color: var(--card-bg);
  border-color: var(--accent);
}

.btn--compact {
  padding: 0.32rem 0.9rem;
  font-size: 0.85rem;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 0.9rem 0;
  font-size: 0.85rem;
}

.breadcrumb li {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.breadcrumb li::after {
  content: "›";
  color: var(--border);
}

.breadcrumb li:last-child::after {
  content: "";
}

.breadcrumb a {
  color: var(--accent);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb [aria-current] {
  color: var(--text-primary);
  font-weight: 600;
}

.grid {
  display: grid;
  gap: 1rem;
}

.grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.9rem;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.card__title {
  font-size: 1.1rem;
  line-height: 1.35;
}

.card__meta {
  font-size: 0.82rem;
  color: rgba(62, 43, 30, 0.72);
}

.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-sm);
  aspect-ratio: 4 / 3;
  background: var(--section-bg-b);
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame--square {
  aspect-ratio: 1 / 1;
}

.photo-stack {
  position: relative;
}

.photo-stack::before,
.photo-stack::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  z-index: -1;
}

.photo-stack::before {
  transform: rotate(-1.6deg);
}

.photo-stack::after {
  transform: rotate(1.4deg);
}

.tile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 1rem;
  border-radius: 1.25rem;
  background: var(--card-bg);
  border: 1px solid var(--border);
  text-decoration: none;
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tile:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.tile__count {
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
}

.list-rows {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--border);
}

.list-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  align-items: center;
  gap: 1rem;
  padding: 0.85rem 0.6rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  transition: background 0.2s ease;
}

.list-row:hover {
  background: #fff;
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.28rem;
  padding: 0.2rem 0.7rem;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--card-bg);
  border: 1px solid var(--border);
  text-decoration: none;
}

.tag--60s {
  background: var(--tag-60s);
  border-color: transparent;
}

.tag--70s {
  background: var(--tag-70s);
  border-color: transparent;
}

.tag--80s {
  background: var(--tag-80s);
  border-color: transparent;
}

.tag--90s {
  background: var(--tag-90s);
  border-color: transparent;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.26rem 0.75rem;
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.4;
  border: 1px solid transparent;
  white-space: nowrap;
}

.status-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.status-badge--new {
  background: #fce4e4;
  color: #b02a35;
  border-color: var(--status-new);
}

.status-badge--updating {
  background: #fef0df;
  color: #b4662e;
  border-color: var(--status-updating);
}

.status-badge--archived {
  background: #dff0ed;
  color: #1e6e63;
  border-color: var(--status-archived);
}

.seq-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 0.5rem;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: var(--card-bg);
  font-size: 0.85rem;
  font-weight: 700;
  line-height: 1;
}

.metric-bar {
  display: flex;
  align-items: flex-end;
  gap: 0.3rem;
  height: 3rem;
}

.metric-bar__item {
  flex: 1;
  border-radius: 6px 6px 0 0;
  background: var(--tag-60s);
  min-height: 4px;
}

.index-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.3rem;
}

.index-bar__item {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--text-primary);
  text-decoration: none;
  font-size: 0.83rem;
  line-height: 1;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.index-bar__item:hover,
.index-bar__item.is-active {
  background: var(--accent);
  color: var(--card-bg);
  border-color: var(--accent);
}

.slide-rail {
  display: flex;
  gap: 1rem;
  overflow-x: auto;
  padding: 0.6rem 0.2rem;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.slide-rail > * {
  flex: 0 0 auto;
  scroll-snap-align: start;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.compare-table th,
.compare-table td {
  border: 1px solid var(--border);
  padding: 0.65rem 0.8rem;
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  background: var(--section-bg-a);
  color: var(--text-primary);
  font-family: var(--title-font);
  font-weight: 700;
}

.compare-table tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.45);
}

.pagination {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  height: 2.2rem;
  padding: 0 0.6rem;
  border-radius: 50%;
  background: var(--card-bg);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  text-decoration: none;
  color: var(--text-primary);
  line-height: 1;
}

.pagination a:hover,
.pagination a.is-current {
  background: var(--accent);
  color: var(--card-bg);
  border-color: var(--accent);
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 960px) {
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }

  .nav-status {
    display: none;
  }
}

@media (max-width: 760px) {
  .brand-tagline {
    max-width: 42vw;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .header-coords {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: rgba(0, 0, 0, 0.32);
    border-top: 1px solid rgba(244, 228, 204, 0.16);
    box-shadow: 0 12px 18px rgba(62, 43, 30, 0.2);
  }

  .site-nav[data-open] {
    display: block;
  }

  .nav-inner {
    flex-direction: column;
    align-items: stretch;
    padding-top: 0.9rem;
    padding-bottom: 1rem;
    gap: 0.8rem;
  }

  .nav-list {
    flex-direction: column;
    gap: 0.1rem;
  }

  .nav-link {
    width: 100%;
    padding: 0.6rem 0.9rem;
    border-radius: var(--radius-sm);
  }

  .nav-link[aria-current="page"],
  .nav-link.is-active {
    background: rgba(244, 228, 204, 0.9);
    color: var(--accent);
  }

  .nav-status {
    display: flex;
    margin-top: 0.3rem;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .list-row {
    grid-template-columns: auto 1fr auto;
    gap: 0.7rem;
  }

  .list-row .list-row__meta {
    display: none;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.6rem;
    padding-block: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .header-top-inner {
    gap: 0.5rem;
  }

  .brand-seal {
    width: 2.4rem;
    height: 2.4rem;
    font-size: 1.2rem;
  }

  .brand-name {
    font-size: 1.25rem;
  }

  .brand-tagline {
    font-size: 0.78rem;
  }

  .nav-toggle-text {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }
}