:root {
  --color-primary: #1E3A2F;
  --color-primary-deep: #142A22;
  --color-content: #F4F0E6;
  --color-paper: #FDF9F2;
  --color-accent: #C9A063;
  --color-alert: #8B2635;
  --color-text: #222222;
  --color-muted: #5A5A5A;
  --color-border: #4A5A5A;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", sans-serif;
  --font-mono: "Roboto Mono", "IBM Plex Mono", monospace;
  --container: 1280px;
  --header-h: 78px;
  --header-h-mobile: 64px;
  --space-1: .25rem;
  --space-2: .5rem;
  --space-3: .75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 5rem;
  --space-10: 6rem;
  --radius: 2px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, .08);
  --shadow-md: 0 10px 30px -12px rgba(0, 0, 0, .25);
  --shadow-lg: 0 24px 50px -20px rgba(0, 0, 0, .35);
  --ease: cubic-bezier(.25, .1, .25, 1);
}

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

* {
  margin: 0;
  padding: 0;
}

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

@media (prefers-reduced-motion: no-preference) {
  html {
    scroll-behavior: smooth;
  }
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-content);
  text-rendering: optimizeLegibility;
}

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

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
  word-break: break-word;
}

p {
  margin-bottom: 1rem;
}

a {
  color: inherit;
  text-decoration-color: rgba(201, 160, 99, .45);
  text-decoration-thickness: .08em;
}

a:hover {
  text-decoration-color: var(--color-accent);
}

ul[class],
ol[class] {
  list-style: none;
  margin: 0;
  padding: 0;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

::selection {
  background: var(--color-accent);
  color: var(--color-primary);
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.content-container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2.5rem);
}

.section {
  margin-block: var(--space-8);
}

.section-label {
  font-family: var(--font-mono);
  font-size: .8rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-accent);
  border-left: 3px solid var(--color-accent);
  padding-left: .75rem;
  margin: 0 0 var(--space-5);
}

.page-title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: .01em;
  margin-bottom: var(--space-4);
}

.page-abstract {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 48em;
}

.text-mono {
  font-family: var(--font-mono);
}

.text-sm {
  font-size: .875rem;
}

.text-accent {
  color: var(--color-accent);
}

.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-with-note {
  grid-template-columns: minmax(0, 14rem) minmax(0, 1fr);
  gap: var(--space-8);
}

.panel {
  background: var(--color-paper);
  border: 1px solid rgba(74, 90, 90, .2);
  box-shadow: var(--shadow-sm);
  padding: var(--space-5);
  border-radius: var(--radius);
}

.panel-float {
  box-shadow: var(--shadow-md);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: .7rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: .95rem;
  font-weight: 600;
  letter-spacing: .05em;
  text-decoration: none;
  cursor: pointer;
  transition: background .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease), box-shadow .3s var(--ease);
}

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

.btn-primary:hover {
  background: #BD9259;
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-ghost:hover {
  background: rgba(201, 160, 99, .15);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  font-size: .875rem;
  color: var(--color-muted);
}

.breadcrumb li + li::before {
  content: "/";
  margin-right: .5rem;
  color: var(--color-border);
}

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

.breadcrumb a:hover {
  color: var(--color-accent);
}

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

.img-container {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, rgba(30, 58, 47, .06) 0%, rgba(201, 160, 99, .12) 100%),
    var(--color-paper);
  border: 1px solid rgba(74, 90, 90, .15);
}

.img-container::before {
  content: "";
  display: block;
  padding-bottom: 56.25%;
}

.img-container img,
.img-container > .img-placeholder {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.img-container > .img-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  font-family: var(--font-mono);
  font-size: .9rem;
  letter-spacing: .08em;
  color: var(--color-muted);
  text-align: center;
}

.img-container-4-3::before {
  padding-bottom: 75%;
}

.img-container-1-1::before {
  padding-bottom: 100%;
}

.tabs {
  background: var(--color-paper);
  border: 1px solid rgba(74, 90, 90, .2);
  box-shadow: var(--shadow-sm);
}

.tab-list {
  display: flex;
  flex-wrap: wrap;
  border-bottom: 1px solid rgba(74, 90, 90, .2);
}

.tab {
  appearance: none;
  background: transparent;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: .9rem 1.4rem;
  font-family: var(--font-sans);
  font-size: .95rem;
  font-weight: 600;
  color: var(--color-muted);
  cursor: pointer;
  transition: color .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.tab:hover {
  background: rgba(201, 160, 99, .08);
  color: var(--color-primary);
}

.tab[aria-selected="true"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-accent);
}

.tab-panel {
  padding: var(--space-5);
}

.tab-panel[hidden] {
  display: none;
}

.scroll-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 80;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-accent);
  border: 1px solid rgba(201, 160, 99, .5);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  font-size: 1.25rem;
  line-height: 1;
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease);
}

.scroll-top:hover {
  transform: translateY(-2px);
}

.skip-link {
  position: fixed;
  top: .5rem;
  left: .5rem;
  z-index: 300;
  padding: .6rem 1.2rem;
  background: var(--color-accent);
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius);
  transform: translateY(calc(-100% - 2rem));
  transition: transform .25s var(--ease);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: linear-gradient(180deg, rgba(20, 42, 34, .96), rgba(30, 58, 47, .92));
  border-bottom: 1px solid rgba(201, 160, 99, .35);
  box-shadow: none;
  transition: box-shadow .3s var(--ease);
}

@supports (backdrop-filter: blur(10px)) {
  .site-header {
    backdrop-filter: blur(10px);
  }
}

.site-header[data-scrolled="true"] {
  box-shadow: 0 8px 30px -10px rgba(0, 0, 0, .35);
}

.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent) 25%, rgba(201, 160, 99, .2) 100%);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  height: var(--header-h);
  padding: 0 var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.brand-link {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  color: var(--color-paper);
  text-decoration: none;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.4rem;
  letter-spacing: .04em;
  white-space: nowrap;
}

.brand-text {
  display: inline-block;
}

.brand-mark {
  position: relative;
  display: inline-block;
  width: .6rem;
  height: .6rem;
  background: var(--color-accent);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px rgba(201, 160, 99, .25);
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 2px;
  background: var(--color-primary);
}

.site-nav {
  display: flex;
  align-items: center;
  margin-left: var(--space-8);
}

.nav-list {
  display: flex;
  align-items: center;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: block;
  padding: .65rem .9rem;
  color: rgba(253, 249, 242, .85);
  text-decoration: none;
  font-size: .95rem;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: color .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease);
}

.nav-link:hover {
  color: var(--color-paper);
  background: rgba(201, 160, 99, .16);
}

.nav-link[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.header-status {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: .55rem;
  padding-left: 1.25rem;
  border-left: 1px solid rgba(201, 160, 99, .3);
  color: rgba(253, 249, 242, .7);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  white-space: nowrap;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex: 0 0 auto;
}

.status-text {
  line-height: 1.2;
}

@keyframes statusPulse {
  0% {
    box-shadow: 0 0 0 0 rgba(201, 160, 99, .4);
  }
  100% {
    box-shadow: 0 0 0 8px rgba(201, 160, 99, 0);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .status-dot {
    animation: statusPulse 2s ease-out infinite;
  }
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--color-paper);
  cursor: pointer;
  border-radius: var(--radius);
}

.nav-toggle:hover {
  background: rgba(201, 160, 99, .1);
}

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: background .3s var(--ease);
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background: currentColor;
  transition: transform .3s var(--ease), top .3s var(--ease), bottom .3s var(--ease);
}

.nav-toggle-icon::before {
  top: -6px;
}

.nav-toggle-icon::after {
  bottom: -6px;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon {
  background: transparent;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before {
  top: 0;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after {
  bottom: 0;
  transform: rotate(-45deg);
}

.site-footer {
  background: var(--color-primary-deep);
  color: rgba(253, 249, 242, .78);
  border-top: 3px solid var(--color-accent);
}

.footer-inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-9) var(--space-5) var(--space-5);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr .8fr 1.1fr 1.1fr;
  gap: var(--space-7) var(--space-6);
}

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

.footer-brand .brand-lockup {
  margin-bottom: var(--space-4);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: .75rem;
  color: var(--color-paper);
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
}

.footer-claim {
  font-size: .9rem;
  max-width: 22em;
  color: rgba(253, 249, 242, .62);
}

.footer-title {
  margin-bottom: var(--space-4);
  font-family: var(--font-serif);
  font-size: .95rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.footer-nav,
.footer-contact-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav li + li {
  margin-top: .6rem;
}

.footer-link {
  color: rgba(253, 249, 242, .75);
  text-decoration: none;
  font-size: .92rem;
  transition: color .25s var(--ease);
}

.footer-link:hover {
  color: var(--color-accent);
}

.footer-contact-list li {
  padding: .2rem 0;
  font-size: .9rem;
  color: rgba(253, 249, 242, .7);
}

.footer-icp p {
  margin: .25rem 0;
  font-size: .85rem;
  color: rgba(253, 249, 242, .6);
  font-family: var(--font-mono);
}

.footer-bottom {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid rgba(253, 249, 242, .14);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  font-size: .82rem;
  color: rgba(253, 249, 242, .5);
}

.footer-bottom p {
  margin: 0;
}

.footer-note {
  font-family: var(--font-mono);
}

@media (max-width: 1100px) {
  .header-status {
    display: none;
  }
  .site-nav {
    margin-left: auto;
  }
}

@media (max-width: 880px) {
  .header-inner {
    height: var(--header-h-mobile);
    gap: var(--space-3);
  }
  .brand-text {
    font-size: 1.15rem;
  }
  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary-deep);
    border-top: 1px solid rgba(201, 160, 99, .25);
    padding: 0 var(--space-5) var(--space-5);
    max-height: calc(100vh - var(--header-h-mobile));
    overflow-y: auto;
  }
  .site-nav[data-open="true"] {
    display: block;
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }
  .nav-item {
    width: 100%;
  }
  .nav-link {
    padding: .95rem .5rem;
    border-bottom: 1px solid rgba(253, 249, 242, .12);
  }
  .nav-link[aria-current="page"] {
    border-bottom-color: var(--color-accent);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 920px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-with-note {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}