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

:root {
  --color-bg: #F7F3E9;
  --color-bg-alt: #DDE5DA;
  --color-ink: #1F1F1F;
  --color-primary: #2F6B5E;
  --color-primary-deep: #1C4A40;
  --color-accent: #C29B62;
  --color-dark: #2B2B2B;
  --color-alert: #D14D3A;
  --color-border: #E2D9C6;
  --color-glass: rgba(247, 243, 233, 0.82);
  --font-title: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STKaiti", "KaiTi", SimSun, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --header-height: 72px;
  --container: 1280px;
  --gap: 32px;
  --radius: 6px;
  --shadow: 0 12px 32px rgba(27, 27, 27, 0.08);
  --transition: 0.3s ease;
}

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

body {
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
}

main {
  display: block;
  min-height: 60vh;
}

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

p {
  margin-bottom: 1em;
}

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

ul,
ol {
  list-style: none;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

a:hover {
  color: var(--color-primary-deep);
}

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

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

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

.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 999;
  background: var(--color-dark);
  color: var(--color-bg);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 20px;
  border-radius: 0 0 6px 6px;
  transition: top 0.25s ease;
}

.skip-link:focus {
  top: 0;
  color: #FFFFFF;
}

.site-container {
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

.site-header.is-scrolled {
  background: var(--color-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 20px rgba(27, 27, 27, 0.04);
}

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: min(100% - 48px, var(--container));
  height: 100%;
  margin-inline: auto;
  gap: 24px;
}

.site-header__brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--color-ink);
  text-decoration: none;
  flex-shrink: 0;
}

.site-header__brand:hover {
  color: var(--color-ink);
}

.site-header__brand-mark {
  position: relative;
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-bg);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 22px;
  border: 2px solid var(--color-accent);
  box-shadow: inset 0 0 0 2px var(--color-primary-deep);
}

.site-header__brand-mark::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  border: 1px dashed var(--color-accent);
  pointer-events: none;
}

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

.site-header__brand-text strong {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.site-header__brand-text small {
  font-size: 12px;
  opacity: 0.7;
  letter-spacing: 0.08em;
  margin-top: 2px;
  color: var(--color-ink);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.5vw, 36px);
}

.site-nav__list a {
  display: block;
  font-size: 15px;
  font-weight: 500;
  color: var(--color-ink);
  text-decoration: none;
  padding: 6px 2px;
  position: relative;
  letter-spacing: 0.03em;
  transition: color 0.2s ease;
}

.site-nav__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

.site-nav__list a:hover {
  color: var(--color-primary);
}

.site-nav__list a:hover::after,
.site-nav__list a[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-nav__list a[aria-current="page"] {
  color: var(--color-primary);
  font-weight: 700;
}

.site-nav__toggle {
  display: none;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  cursor: pointer;
  padding: 0;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.site-nav__toggle-line {
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

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

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

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

.site-footer {
  background: var(--color-dark);
  color: rgba(232, 228, 216, 0.82);
  padding: 72px 0 24px;
  margin-top: auto;
}

.site-footer__main {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr 1.4fr;
  gap: 48px;
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.site-footer__seal {
  display: inline-block;
  padding: 8px 18px;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
  font-family: var(--font-title);
  font-weight: 900;
  font-size: 18px;
  letter-spacing: 0.15em;
  border-radius: 4px;
  transform: rotate(-1deg);
}

.site-footer__statement {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(232, 228, 216, 0.7);
  max-width: 32ch;
}

.site-footer__title {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--color-accent);
  margin-bottom: 18px;
  position: relative;
  padding-bottom: 8px;
}

.site-footer__title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 32px;
  height: 1px;
  background: var(--color-accent);
}

.site-footer__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.site-footer__list a {
  color: rgba(232, 228, 216, 0.82);
  font-size: 14px;
  transition: color 0.2s ease;
}

.site-footer__list a:hover {
  color: #FFFFFF;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.site-footer__contact-item {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(232, 228, 216, 0.82);
}

.site-footer__note {
  margin-top: 12px;
  font-size: 13px;
  color: rgba(194, 155, 98, 0.85);
  padding: 10px 12px;
  border-left: 3px solid var(--color-accent);
  background: rgba(194, 155, 98, 0.08);
}

.site-footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  width: min(100% - 48px, var(--container));
  margin-inline: auto;
  padding-top: 24px;
  font-size: 13px;
  color: rgba(232, 228, 216, 0.5);
}

.site-footer__copyright,
.site-footer__icp {
  margin: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  border: 2px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

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

.btn--primary:hover {
  background: var(--color-primary-deep);
  color: #FFFFFF;
}

.btn--outline {
  background: transparent;
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: var(--color-bg);
}

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

.btn--accent:hover {
  background: #A9864C;
  color: var(--color-dark);
}

.page-hero {
  padding-top: calc(var(--header-height) + 48px);
  padding-bottom: 56px;
  position: relative;
  overflow: hidden;
}

.page-section {
  padding: 80px 0;
}

.page-section--alt {
  background: var(--color-bg-alt);
}

.tone-block {
  background: var(--color-bg-alt);
  padding: 48px 0;
}

.section-title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(26px, 3vw, 44px);
  line-height: 1.25;
  margin-bottom: 16px;
  display: inline-block;
  position: relative;
}

.section-title::after {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  background: var(--color-accent);
  margin-top: 8px;
}

.section-title--center {
  text-align: center;
}

.section-title--center::after {
  margin-inline: auto;
}

.split {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 48px;
  align-items: start;
}

.brand-panel {
  background: var(--color-primary-deep);
  color: var(--color-bg);
  padding: 48px 32px;
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.brand-panel::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 140px;
  height: 140px;
  border: 2px solid rgba(194, 155, 98, 0.3);
  border-radius: 50%;
  pointer-events: none;
}

.content-panel {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 32px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.frame-hero {
  position: relative;
  padding: 32px;
  border: 2px solid var(--color-primary);
  background:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 32px 32px;
  background-color: rgba(247, 243, 233, 0.7);
}

.frame-hero::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--color-accent);
  pointer-events: none;
}

.glass-panel {
  background: var(--color-glass);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: 12px;
  box-shadow: var(--shadow);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

.grid__span-4 {
  grid-column: span 4;
}

.grid__span-6 {
  grid-column: span 6;
}

.grid__span-8 {
  grid-column: span 8;
}

.grid__span-12 {
  grid-column: span 12;
}

.card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: 0 4px 16px rgba(27, 27, 27, 0.05);
}

.timeline {
  position: relative;
  padding-left: 28px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent) 60%, transparent);
}

.timeline__item {
  position: relative;
  padding-bottom: 28px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 2px var(--color-primary);
}

.timeline__item:last-child::before {
  background: var(--color-accent);
  box-shadow: 0 0 0 2px var(--color-accent);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.tab-btn {
  padding: 10px 20px;
  border: 1px solid var(--color-border);
  background: transparent;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-ink);
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

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

[role="tabpanel"] {
  display: none;
  padding: 24px;
  border: 1px solid var(--color-border);
  background: #FFFFFF;
  border-radius: var(--radius);
}

[role="tabpanel"][data-active="true"] {
  display: block;
}

.seal {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--color-alert);
  color: var(--color-alert);
  font-family: var(--font-title);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0.1em;
  border-radius: 3px;
  transform: rotate(-1.5deg);
  line-height: 1.4;
}

.data-table {
  font-family: var(--font-mono);
  font-size: 14px;
  width: 100%;
}

.data-table th {
  font-family: var(--font-body);
  font-weight: 700;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 2px solid var(--color-primary);
  background: var(--color-bg);
  letter-spacing: 0.05em;
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

.data-table tr:hover td {
  background: rgba(221, 229, 218, 0.5);
}

.ink-line {
  height: 1px;
  border: none;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent), transparent);
  margin: 40px 0;
}

.img-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-primary);
  border-radius: 4px;
  background: var(--color-bg-alt);
  aspect-ratio: 4 / 3;
}

.img-frame::after {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid var(--color-accent);
  pointer-events: none;
}

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

.img-frame--blur img {
  filter: blur(2px) saturate(0.85);
  transition: filter 0.4s ease;
}

.img-frame--blur:hover img {
  filter: blur(0) saturate(1);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  color: #777777;
  margin-bottom: 24px;
}

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

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

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

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

[data-scroll-progress] {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 200;
  height: 3px;
  width: 0;
  background: linear-gradient(to right, var(--color-primary), var(--color-accent));
}

@media (max-width: 899px) {
  :root {
    --header-height: 60px;
  }

  .site-header {
    height: var(--header-height);
  }

  .site-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 40px 28px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .site-nav__list a {
    display: block;
    font-size: 20px;
    font-weight: 700;
    padding: 16px 4px;
    border-bottom: 1px solid var(--color-border);
  }

  .site-nav__list a::after {
    display: none;
  }

  .site-nav__toggle {
    display: flex;
  }

  .split {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .grid__span-4,
  .grid__span-6,
  .grid__span-8,
  .grid__span-12 {
    grid-column: span 12;
  }

  .site-footer__main {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .page-section {
    padding: 56px 0;
  }
}

@media (max-width: 599px) {
  :root {
    --header-height: 56px;
  }

  .site-header__brand-mark {
    width: 36px;
    height: 36px;
    font-size: 18px;
  }

  .site-header__brand-text strong {
    font-size: 15px;
  }

  .site-header__brand-text small {
    display: none;
  }

  .site-header__inner {
    width: calc(100% - 32px);
  }

  .site-footer {
    padding: 48px 0 20px;
  }

  .site-footer__main {
    grid-template-columns: 1fr;
    gap: 28px;
    width: calc(100% - 32px);
  }

  .site-footer__bottom {
    width: calc(100% - 32px);
    flex-direction: column;
    text-align: center;
  }

  .page-section {
    padding: 40px 0;
  }

  .frame-hero {
    padding: 20px;
  }

  .content-panel {
    padding: 20px;
  }

  .img-frame {
    aspect-ratio: 16 / 10;
  }
}

@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;
  }

  .site-nav {
    transition: none;
  }

  .site-header {
    transition: none;
  }

  .site-nav__toggle-line {
    transition: none;
  }
}