:root {
  --bg: #f2efe8;
  --bg-soft: #fbfaf7;
  --panel: rgba(255, 255, 255, 0.78);
  --panel-strong: rgba(255, 255, 255, 0.92);
  --line: rgba(25, 41, 53, 0.12);
  --line-strong: rgba(25, 41, 53, 0.24);
  --text: #15202b;
  --muted: #5d6c7a;
  --accent: #0f5f66;
  --accent-soft: #d7ece9;
  --signal: #9f5c34;
  --scroll-track: rgba(25, 41, 53, 0.08);
  --scroll-thumb: rgba(15, 95, 102, 0.46);
  --scroll-thumb-hover: rgba(15, 95, 102, 0.68);
  --shadow: 0 20px 60px rgba(21, 32, 43, 0.08);
  --radius-xl: 28px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --content-width: 1240px;
  --side-card-width: 290px;
  --side-card-gap: 24px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;
  color: var(--text);
  font-family: "Manrope", "Segoe UI", sans-serif;
  line-height: 1.7;
  background:
    radial-gradient(circle at top left, rgba(15, 95, 102, 0.14), transparent 32%),
    radial-gradient(circle at top right, rgba(159, 92, 52, 0.12), transparent 28%),
    linear-gradient(180deg, #f7f4ed 0%, #f0ece4 48%, #ebe6dd 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.35;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.32) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.24) 1px, transparent 1px);
  background-size: 26px 26px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.48), transparent 85%);
}

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

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

button {
  font: inherit;
}

.site-frame {
  position: relative;
  z-index: 1;
}

.site-header,
.site-main,
.site-footer {
  width: min(calc(100% - 32px), var(--content-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 18px 0 0;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 22px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(248, 246, 240, 0.76);
  backdrop-filter: blur(18px);
  box-shadow: var(--shadow);
}

.site-brand {
  display: grid;
  gap: 2px;
}

.site-brand-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-brand-subtitle {
  color: var(--muted);
  font-size: 0.9rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 12px;
}

.site-nav-link,
.filter-chip,
.doc-tag {
  border: 1px solid transparent;
  border-radius: 999px;
  transition: 0.2s ease;
}

.site-nav-link {
  padding: 10px 16px;
  color: var(--muted);
}

.site-nav-link:hover,
.site-nav-link:focus-visible {
  border-color: var(--line);
  background: var(--panel-strong);
  color: var(--text);
}

.site-main {
  padding: 28px 0 64px;
}

.page-home .site-main {
  padding-top: 0;
}

.site-footer {
  padding: 0 0 40px;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
  padding: 0 6px;
}

.doc-home,
.doc-page-layout {
  display: grid;
  gap: 24px;
}

.hero-banner,
.filter-strip,
.doc-card,
.doc-directory-inner,
.doc-page-main,
.doc-page-toc-inner {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-banner {
  position: relative;
  isolation: isolate;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  min-height: 100vh;
  width: 100dvw;
  margin-left: calc(50% - 50dvw);
  margin-right: calc(50% - 50dvw);
  border-radius: 0 0 36px 36px;
  border-left: 0;
  border-right: 0;
  border-top: 0;
  background:
    linear-gradient(148deg, rgba(11, 20, 28, 0.34), rgba(11, 20, 28, 0.72)),
    url("/images/title.png") center 18% / cover no-repeat;
}

.hero-banner::before {
  content: "";
  position: absolute;
  inset: -3%;
  z-index: -2;
  background: url("/images/title.png") center/cover no-repeat;
  filter: blur(8px);
  opacity: 0.35;
  transform: scale(1.06);
}

.hero-banner::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 78% 14%, rgba(146, 203, 236, 0.24), transparent 38%),
    linear-gradient(95deg, rgba(6, 16, 24, 0.9) 0%, rgba(6, 16, 24, 0.54) 40%, rgba(6, 16, 24, 0.1) 100%);
}

.hero-copy {
  position: relative;
  z-index: 1;
  margin: 0 auto;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  backdrop-filter: none;
  box-shadow: none;
  color: #f3f7f8;
  max-width: min(560px, calc(100% - 40px));
}

.page-home .site-header {
  position: fixed;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: min(calc(100% - 32px), var(--content-width));
  z-index: 40;
  padding-top: 18px;
}

.page-home .site-header-inner {
  background: rgba(7, 18, 25, 0.1);
  border-color: rgba(255, 255, 255, 0.14);
  box-shadow: 0 12px 34px rgba(5, 11, 16, 0.16);
  backdrop-filter: blur(8px);
  transition: background 0.28s ease, border-color 0.28s ease, box-shadow 0.28s ease;
}

.page-home .site-brand-title,
.page-home .site-brand-subtitle,
.page-home .site-nav-link {
  color: rgba(245, 249, 252, 0.95);
}

.page-home .site-nav-link:hover,
.page-home .site-nav-link:focus-visible {
  border-color: rgba(255, 255, 255, 0.28);
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.page-home.home-scrolled .site-header-inner {
  background: rgba(7, 18, 25, 0.46);
  border-color: rgba(255, 255, 255, 0.25);
  box-shadow: 0 22px 70px rgba(5, 11, 16, 0.34);
}

.hero-kicker,
.section-kicker {
  margin: 0 0 10px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero-kicker {
  color: #95d7db;
}

.hero-copy h1,
.filter-strip-head h2,
.doc-directory-inner h2,
.doc-page-header h1 {
  margin: 0;
  font-family: "Noto Serif SC", serif;
  line-height: 1.12;
}

.hero-copy h1 {
  font-size: clamp(2.5rem, 6vw, 4.4rem);
  text-shadow: 0 10px 30px rgba(5, 12, 18, 0.45);
}

.hero-text {
  margin: 0;
  color: rgba(243, 247, 248, 0.9);
  font-size: 1.02rem;
  text-shadow: 0 8px 24px rgba(5, 12, 18, 0.38);
}

.hero-subline {
  margin-top: 18px;
}

.hero-subline .hero-text {
  max-width: 34rem;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 0;
}

.hero-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 26px;
}

.hero-meta span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: rgba(243, 247, 248, 0.84);
}

.hero-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  width: auto;
  gap: 18px;
  flex-shrink: 0;
}

.hero-links a {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 0;
  border-radius: 0;
  color: rgba(243, 247, 248, 0.95);
  background: transparent;
  box-shadow: none;
  transition: color 0.22s ease, transform 0.22s ease, opacity 0.22s ease;
}

.hero-link-icon {
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
}

.hero-link-icon--github {
  fill: currentColor;
}

.hero-link-icon--mail {
  fill: none;
  stroke: currentColor;
  stroke-width: 2.1;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-links a:hover,
.hero-links a:focus-visible {
  color: #ffffff;
  opacity: 1;
  transform: translateY(-2px);
}

.hero-links a {
  opacity: 0.92;
}

.filter-strip {
  padding: 22px 24px 24px;
}

.filter-strip-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: end;
  margin-bottom: 18px;
}

.filter-state {
  margin: 0;
  color: var(--muted);
}

.filter-chip-list,
.doc-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-chip,
.doc-tag {
  padding: 9px 14px;
  cursor: pointer;
  color: var(--muted);
  background: var(--bg-soft);
}

.filter-chip span {
  color: var(--signal);
}

.filter-chip:hover,
.filter-chip:focus-visible,
.doc-tag:hover,
.doc-tag:focus-visible,
.filter-chip.is-active {
  border-color: var(--line-strong);
  background: var(--accent-soft);
  color: var(--accent);
}

.doc-home-grid,
.doc-page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--side-card-width);
  gap: 16px;
  align-items: start;
  padding-right: 0;
}

.doc-feed {
  display: grid;
  gap: 18px;
}

.doc-card {
  padding: 24px 24px 22px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.doc-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.doc-card[hidden],
.doc-directory-list a[hidden] {
  display: none;
}

.doc-card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.doc-card h3 {
  margin: 12px 0 10px;
  font-size: clamp(1.35rem, 2vw, 1.72rem);
}

.doc-card h3 a:hover {
  color: var(--accent);
}

.doc-card-summary,
.doc-content,
.doc-toc-empty {
  color: var(--muted);
}

.doc-card-summary p:first-child,
.doc-content > *:first-child {
  margin-top: 0;
}

.doc-card-summary p:last-child,
.doc-content > *:last-child {
  margin-bottom: 0;
}

.doc-empty-state {
  padding: 22px 24px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-lg);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.45);
}

.doc-directory {
  position: sticky;
  top: 102px;
  align-self: start;
  width: var(--side-card-width);
  height: calc(100vh - 118px);
  max-height: calc(100vh - 118px);
  overflow: visible;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
  z-index: 12;
}

.doc-directory-inner,
.doc-page-toc-inner {
  display: flex;
  flex-direction: column;
  min-height: 0;
  flex: 1;
  height: 100%;
  overflow: auto;
  overscroll-behavior: contain;
  padding: 20px;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

.doc-directory-inner h2,
.doc-page-toc-inner h2 {
  font-size: 1.2rem;
}

.doc-directory-list,
.doc-toc-list {
  display: grid;
  flex: 1;
  gap: 8px;
  min-height: 0;
  overflow: auto;
  overscroll-behavior: contain;
  padding-right: 4px;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) var(--scroll-track);
}

.doc-directory-list::-webkit-scrollbar,
.doc-toc-list::-webkit-scrollbar {
  width: 10px;
}

.doc-directory-list::-webkit-scrollbar-track,
.doc-toc-list::-webkit-scrollbar-track {
  background: var(--scroll-track);
  border-radius: 999px;
}

.doc-directory-list::-webkit-scrollbar-thumb,
.doc-toc-list::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 999px;
  border: 2px solid transparent;
  background-clip: padding-box;
}

.doc-directory-list:hover::-webkit-scrollbar-thumb,
.doc-toc-list:hover::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb-hover);
}

.doc-directory-list a,
.doc-toc-list a {
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--muted);
  transition: 0.2s ease;
}

.doc-directory-list a:hover,
.doc-directory-list a.is-active,
.doc-toc-list a:hover,
.doc-toc-list a.is-active {
  background: var(--accent-soft);
  color: var(--accent);
}

.doc-page-main {
  padding: clamp(24px, 4vw, 42px);
}

.doc-page-header {
  margin-bottom: 28px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--line);
}

.doc-page-header h1 {
  font-size: clamp(2.1rem, 4vw, 3.3rem);
}

.doc-page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.doc-page-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.doc-page-tags a {
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: var(--bg-soft);
}

.doc-page-tags a:hover {
  border-color: var(--line-strong);
  background: var(--accent-soft);
  color: var(--accent);
}

.doc-page-toc {
  position: sticky;
  top: 102px;
  align-self: start;
  width: var(--side-card-width);
  height: calc(100vh - 118px);
  max-height: calc(100vh - 118px);
  overflow: visible;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow);
  z-index: 12;
}

.doc-directory.is-pinned,
.doc-page-toc.is-pinned {
  position: fixed;
  top: 102px;
  left: var(--pin-left, auto);
  width: var(--pin-width, var(--side-card-width));
  right: auto;
}

.doc-toc-list .lv3 {
  padding-left: 24px;
  font-size: 0.92rem;
}

.doc-content {
  font-size: 1rem;
}

.doc-content h2,
.doc-content h3,
.doc-content h4 {
  margin-top: 1.9em;
  margin-bottom: 0.6em;
  color: var(--text);
  font-family: "Noto Serif SC", serif;
  line-height: 1.3;
  scroll-margin-top: 110px;
}

.doc-content h2 {
  padding-bottom: 0.35em;
  border-bottom: 1px solid var(--line);
}

.doc-content p,
.doc-content ul,
.doc-content ol,
.doc-content blockquote,
.doc-content pre,
.doc-content table {
  margin: 0 0 1.1em;
}

.doc-content ul,
.doc-content ol {
  padding-left: 1.35rem;
}

.doc-content blockquote {
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  border-radius: 0 14px 14px 0;
  background: rgba(15, 95, 102, 0.08);
}

.doc-content code {
  padding: 0.15em 0.42em;
  border-radius: 8px;
  background: rgba(15, 95, 102, 0.08);
  color: #18464d;
}

.doc-content pre,
.doc-content .highlight {
  overflow-x: auto;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: #13202a;
  color: #edf5f6;
}

.doc-content pre code,
.doc-content .highlight code {
  padding: 0;
  background: transparent;
  color: inherit;
}

.doc-content table {
  width: 100%;
  border-collapse: collapse;
}

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

.doc-content th {
  background: rgba(15, 95, 102, 0.06);
}

@media (max-width: 1080px) {
  .doc-home-grid,
  .doc-page-layout {
    grid-template-columns: 1fr;
    padding-right: 0;
  }

  .doc-directory,
  .doc-page-toc {
    position: static;
    right: auto;
    width: auto;
    height: auto;
    max-height: none;
    overflow: visible;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }

  .hero-banner {
    min-height: 72vh;
    border-radius: 0 0 24px 24px;
  }
}

@media (max-width: 720px) {
  .site-header,
  .site-main,
  .site-footer {
    width: min(calc(100% - 20px), var(--content-width));
  }

  .page-home .site-header {
    width: min(calc(100% - 20px), var(--content-width));
  }

  .site-header-inner,
  .filter-strip,
  .doc-card,
  .doc-directory-inner,
  .doc-page-main,
  .doc-page-toc-inner {
    border-radius: 22px;
  }

  .site-header-inner,
  .filter-strip,
  .doc-card,
  .doc-directory-inner,
  .doc-page-main,
  .doc-page-toc-inner {
    padding-left: 16px;
    padding-right: 16px;
  }

  .site-header-inner,
  .filter-strip-head {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-copy {
    margin-left: auto;
    margin-right: auto;
    padding: 16px 14px;
  }

  .hero-subline {
    margin-top: 14px;
  }

  .hero-subline .hero-text {
    max-width: 100%;
  }

  .hero-bottom {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 18px;
  }

  .hero-links {
    width: auto;
    gap: 14px;
  }

  .hero-links a {
    width: 42px;
    height: 42px;
  }

  .hero-link-icon {
    width: 24px;
    height: 24px;
    flex: 0 0 24px;
  }

  .doc-page-main {
    padding-top: 24px;
    padding-bottom: 24px;
  }
}