:root {
  --color-gold-dark: #C9A227;
  --color-gold-light: #E4CD73;
  --color-snow: #F7F2E7;
  --color-brown: #3B2D1E;
  --color-ink: #1F1A15;
  --color-bronze: #8B6F47;
  --color-blue: #0E4E6E;
  --color-violet: #5B4B8A;
  --color-teal: #1B6B6B;
  --color-line: #D8D0C2;
  --color-red: #A63A2B;
  --color-leather: #4A3320;
  --font-heading: "Noto Serif SC", "Source Han Serif SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: clamp(2.8rem, 6vw, 5.5rem);
  --font-h1: clamp(2.2rem, 4vw, 3.6rem);
  --font-h2: clamp(1.5rem, 2.5vw, 2.2rem);
  --font-body-size: clamp(1rem, 1.1vw, 1.1rem);
  --font-caption: 0.875rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
  font-size: 100%;
}

body {
  margin: 0;
  background: var(--color-snow);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--font-body-size);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 900;
  line-height: 1.2;
  color: inherit;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

ul,
ol {
  margin: 0;
  padding: 0;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  transform: translateY(-160%);
  background: var(--color-gold-dark);
  color: var(--color-ink);
  font-weight: 700;
  padding: 10px 18px;
  text-decoration: none;
  border: 1px solid var(--color-ink);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(31, 26, 21, 0.96);
  color: var(--color-snow);
  border-bottom: 1px solid var(--color-bronze);
  backdrop-filter: blur(8px);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(1rem, 2vw, 2.5rem);
  width: min(100% - 2rem, 1440px);
  margin-inline: auto;
  min-height: 88px;
  padding: 0 1rem;
}

.header__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-right: auto;
  color: var(--color-snow);
  text-decoration: none;
  flex-shrink: 0;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  background: var(--color-gold-dark);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 900;
  clip-path: polygon(0 0, 100% 0, 100% 68%, 68% 100%, 0 100%);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--color-gold-light);
  letter-spacing: 0.14em;
}

.nav-main ul {
  display: flex;
  align-items: center;
  gap: 2px;
  list-style: none;
}

.nav-main__link {
  display: flex;
  align-items: center;
  white-space: nowrap;
  gap: 0.4rem;
  padding: 10px 12px;
  font-size: 0.92rem;
  color: var(--color-snow);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.nav-index {
  font-family: var(--font-heading);
  font-size: 0.65rem;
  color: var(--color-bronze);
  transition: color 0.25s ease;
}

.nav-main__link:hover {
  color: var(--color-gold-light);
}

.nav-main__link:hover .nav-index {
  color: var(--color-gold-light);
}

.nav-main__link[aria-current="page"] {
  color: var(--color-gold-light);
  border-bottom-color: var(--color-gold-dark);
}

.nav-main__link[aria-current="page"] .nav-index {
  color: var(--color-gold-dark);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  flex-shrink: 0;
}

.o-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.o-btn--gold {
  background: var(--color-gold-dark);
  border-color: var(--color-gold-dark);
  color: var(--color-ink);
}

.o-btn--gold:hover {
  background: var(--color-gold-light);
  border-color: var(--color-gold-light);
}

.o-btn--ghost {
  background: transparent;
  border-color: var(--color-bronze);
  color: var(--color-snow);
}

.o-btn--ghost:hover {
  border-color: var(--color-gold-dark);
  color: var(--color-gold-light);
}

.o-btn--dark {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-snow);
}

.o-btn--dark:hover {
  background: var(--color-brown);
  border-color: var(--color-brown);
}

.o-btn--small {
  min-height: 44px;
  padding: 8px 14px;
  font-size: 0.85rem;
}

.header__cta {
  margin-right: 4px;
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  background: transparent;
  border: 1px solid var(--color-bronze);
  color: var(--color-snow);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 2px;
  background: currentColor;
  margin-inline: auto;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav-toggle__bar + .nav-toggle__bar {
  margin-top: 5px;
}

.nav-toggle[data-open] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[data-open] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[data-open] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.rail-main {
  position: fixed;
  left: clamp(8px, 1.5vw, 24px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.rail-main::after {
  content: "";
  width: 1px;
  height: 110px;
  background: linear-gradient(to bottom, transparent, var(--color-gold-dark), transparent);
}

.rail-main__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 0.63rem;
  letter-spacing: 0.32em;
  color: var(--color-bronze);
}

.rail-point {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--color-bronze);
  font-family: var(--font-heading);
  font-size: 0.68rem;
  color: var(--color-bronze);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.rail-point.is-active {
  background: var(--color-gold-dark);
  border-color: var(--color-gold-dark);
  color: var(--color-ink);
}

.site-main {
  min-height: 70vh;
}

.container {
  width: min(100% - 2rem, 1280px);
  margin-inline: auto;
}

.container--narrow {
  max-width: 900px;
}

.container--wide {
  max-width: 1600px;
}

.section {
  padding-block: clamp(3.5rem, 8vw, 7rem);
}

.section--dark {
  background: var(--color-brown);
  color: var(--color-snow);
}

.section--tint {
  background: var(--color-gold-light);
  color: var(--color-ink);
}

.section--leather {
  background: var(--color-leather);
  color: var(--color-snow);
}

.section--line {
  border-top: 1px solid var(--color-line);
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2.5rem;
  position: relative;
}

.section-index {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(4rem, 12vw, 9rem);
  line-height: 0.8;
  color: rgba(201, 162, 39, 0.2);
  -webkit-text-stroke: 1px var(--color-gold-dark);
  letter-spacing: -0.04em;
}

.section-title {
  font-family: var(--font-heading);
  font-size: var(--font-h1);
  line-height: 1.15;
  margin: 0.3em 0 0.2em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-gold-dark);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 1px;
  background: currentColor;
}

.section-head__desc {
  max-width: 56ch;
  color: var(--color-bronze);
  font-size: 1rem;
}

.section--dark .eyebrow {
  color: var(--color-gold-light);
}

.section--dark .section-head__desc {
  color: var(--color-line);
}

.edge-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 0.72rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-bronze);
  max-height: 200px;
}

.display-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: var(--font-display);
  line-height: 0.95;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.theme-ribbon {
  height: 10px;
  background: repeating-linear-gradient(
    90deg,
    var(--color-gold-dark) 0 14px,
    var(--color-brown) 14px 28px,
    var(--color-line) 28px 42px
  );
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: clamp(1rem, 2vw, 1.5rem);
}

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

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

.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.o-chip {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 4px 12px;
  border: 1px solid var(--color-line);
  background: transparent;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-violet);
}

.o-chip--violet {
  border-color: var(--color-violet);
  background: rgba(91, 75, 138, 0.08);
}

.o-chip--blue {
  border-color: var(--color-blue);
  color: var(--color-blue);
  background: rgba(14, 78, 110, 0.06);
}

.o-card {
  display: block;
  background: var(--color-snow);
  border: 1px solid var(--color-line);
  padding: 24px;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.o-card:hover {
  border-color: var(--color-gold-dark);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(31, 26, 21, 0.08);
}

.o-card__index {
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--color-gold-dark);
}

.o-card__title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  line-height: 1.35;
  margin: 0.4rem 0 0.5rem;
}

.o-card__meta {
  font-size: 0.85rem;
  color: var(--color-blue);
  letter-spacing: 0.04em;
}

.o-card__summary {
  font-size: 0.95rem;
  color: var(--color-bronze);
  margin-top: 0.6rem;
}

.o-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  background: var(--color-snow);
}

.o-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  min-width: 640px;
}

.o-table th,
.o-table td {
  padding: 12px 14px;
  border: 1px solid var(--color-line);
  text-align: left;
}

.o-table th {
  background: var(--color-gold-dark);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: 0.88rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.o-table tbody tr:nth-child(even) {
  background: rgba(216, 208, 194, 0.22);
}

.o-board {
  position: relative;
  background: var(--color-brown);
  color: var(--color-snow);
  border: 1px solid var(--color-gold-dark);
  padding: 28px;
  overflow: hidden;
}

.o-board::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(201, 162, 39, 0.35);
  pointer-events: none;
}

.o-board__tag {
  position: relative;
  z-index: 1;
  display: block;
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-gold-light);
}

.o-board__title {
  position: relative;
  z-index: 1;
  font-family: var(--font-heading);
  font-size: clamp(1.3rem, 2vw, 1.8rem);
  line-height: 1.3;
  margin: 0.5rem 0 0.6rem;
}

.o-board__summary {
  position: relative;
  z-index: 1;
  color: var(--color-line);
  max-width: 60ch;
}

.o-board__aside {
  position: relative;
  z-index: 1;
  border-left: 2px solid var(--color-gold-dark);
  padding-left: 16px;
  color: var(--color-snow);
}

.o-figure {
  position: relative;
  background: var(--color-brown);
  border: 1px solid var(--color-bronze);
  aspect-ratio: 16 / 10;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.o-figure--wide {
  aspect-ratio: 21 / 9;
}

.o-figure--portrait {
  aspect-ratio: 4 / 5;
}

.o-figure__placeholder {
  border: 1px dashed var(--color-gold-dark);
  padding: 12px 18px;
  font-size: 0.78rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--color-gold-dark);
  text-align: center;
}

.grid-lines {
  background-image:
    linear-gradient(to right, rgba(216, 208, 194, 0.35) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(216, 208, 194, 0.35) 1px, transparent 1px);
  background-size: 48px 48px;
}

.hero-frame {
  position: relative;
  background: var(--color-brown);
  border: 1px solid var(--color-gold-dark);
  padding: clamp(1.5rem, 5vw, 4rem);
}

.hero-frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(201, 162, 39, 0.4);
  pointer-events: none;
}

.hero-frame__content {
  position: relative;
  z-index: 1;
  max-width: 760px;
}

.hero-frame__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 1.5rem;
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(201, 162, 39, 0.5);
  font-size: 0.85rem;
  color: var(--color-gold-light);
}

.site-footer {
  background: var(--color-ink);
  color: var(--color-snow);
}

.footer__decorative {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 48px;
  padding-inline: clamp(32px, 8vw, 120px);
  background: var(--color-brown);
  border-bottom: 1px solid var(--color-bronze);
  overflow: hidden;
}

.footer-diamond {
  width: 8px;
  height: 8px;
  flex: none;
  background: var(--color-gold-dark);
  transform: rotate(45deg);
}

.footer-diamond--lg {
  width: 16px;
  height: 16px;
  background: transparent;
  border: 1px solid var(--color-gold-dark);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.3fr;
  gap: 3rem 2rem;
  width: min(100% - 2rem, 1440px);
  margin-inline: auto;
  padding-block: clamp(3rem, 6vw, 5.5rem) 2.5rem;
}

.footer__brand-block {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.footer__brand-line {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--color-gold-light);
  line-height: 1.3;
}

.footer__statement {
  max-width: 42ch;
  color: var(--color-line);
  font-size: 0.95rem;
  line-height: 1.9;
}

.footer-nav,
.footer-support {
  display: grid;
  align-content: start;
  gap: 1rem;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-gold-dark);
}

.footer-nav ul,
.footer-support ul {
  list-style: none;
  display: grid;
  gap: 0.5rem;
}

.footer-nav a,
.footer-support a {
  display: inline-block;
  padding: 4px 0;
  color: var(--color-snow);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.footer-nav a:hover,
.footer-support a:hover {
  color: var(--color-gold-light);
  border-bottom-color: var(--color-gold-dark);
}

.footer__contact {
  display: grid;
  align-content: start;
  gap: 0.35rem;
}

.footer__contact p {
  color: var(--color-snow);
  opacity: 0.88;
  font-size: 0.95rem;
}

.footer__legal {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  border-top: 1px solid var(--color-bronze);
  padding-top: 1.5rem;
  color: var(--color-bronze);
  font-size: 0.8rem;
}

.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(60px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.has-js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 90;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  border: 1px solid var(--color-ink);
  background: var(--color-gold-dark);
  color: var(--color-ink);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease, background 0.3s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-to-top:hover {
  background: var(--color-gold-light);
}

.back-to-top__text {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

a:focus-visible,
button:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-gold-dark);
  outline-offset: 3px;
}

@media (max-width: 1100px) {
  .rail-main {
    display: none;
  }
}

@media (max-width: 980px) {
  .header-inner {
    min-height: 72px;
  }

  .nav-main {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: var(--color-ink);
    border-top: 1px solid var(--color-bronze);
    max-height: calc(100vh - 72px);
    overflow-y: auto;
  }

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

  .nav-main ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 16px 16px;
  }

  .nav-main__link {
    border: 0;
    border-bottom: 1px solid rgba(139, 111, 71, 0.45);
    padding: 14px 12px;
    font-size: 1rem;
  }

  .nav-main__link[aria-current="page"] {
    border-bottom: 1px solid rgba(139, 111, 71, 0.45);
    border-left: 2px solid var(--color-gold-dark);
  }

  .nav-toggle {
    display: flex;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }

  .footer__legal {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  .brand-sub {
    display: none;
  }

  .header__cta {
    font-size: 0.85rem;
    padding-inline: 14px;
  }

  .section-head {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }

  .edge-note {
    writing-mode: horizontal-tb;
    max-height: none;
  }

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

  .col-3,
  .col-4,
  .col-5,
  .col-6,
  .col-7,
  .col-8,
  .col-9,
  .col-12 {
    grid-column: span 12;
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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