:root {
  --bg: #080a0f;
  --panel: rgba(18, 22, 32, 0.88);
  --panel-strong: rgba(15, 19, 29, 0.96);
  --text: #f4efe5;
  --muted: #b9b0a3;
  --line: rgba(255, 255, 255, 0.11);
  --accent: #d9aa4e;
  --accent2: #80d8ff;
  --header-height: 72px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 15% 5%, rgba(217, 170, 78, 0.20), transparent 34rem),
    radial-gradient(circle at 85% 10%, rgba(128, 216, 255, 0.10), transparent 30rem),
    linear-gradient(180deg, #080a0f, #0e1118 48%, #080a0f);
  line-height: 1.7;
}

body.detail-drawer-open {
  overflow: hidden;
  touch-action: none;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: var(--header-height);
  padding: 18px min(5vw, 64px);
  background: rgba(8, 10, 15, 0.72);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
}

.mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 9px;
  font-weight: 900;
}

nav {
  display: flex;
  gap: 20px;
  color: var(--muted);
  font-size: 0.95rem;
}

.language-switcher {
  display: inline-flex;
  gap: 4px;
  padding: 4px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(8, 10, 15, 0.72);
}

.language-button {
  min-width: 42px;
  min-height: 34px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.language-button[aria-pressed="true"] {
  background: var(--accent);
  color: #0b0d12;
  box-shadow: 0 0 18px rgba(217, 170, 78, 0.25);
}

.language-button:focus-visible {
  outline: 2px solid var(--accent2);
  outline-offset: 2px;
}

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

main {
  width: min(1180px, 92vw);
  margin: 0 auto;
}

.hero {
  min-height: 72vh;
  display: grid;
  place-content: center;
  padding: 88px 0 72px;
}

.eyebrow {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 0.78rem;
  font-weight: 800;
}

h1 {
  margin: 0.16em 0;
  max-width: 980px;
  font-size: clamp(3rem, 8vw, 7.2rem);
  line-height: 0.95;
  letter-spacing: -0.06em;
}

h1 span {
  color: transparent;
  -webkit-text-stroke: 1px rgba(244, 239, 229, 0.84);
}

h2 {
  margin: 0.15em 0 0.65em;
  font-size: clamp(1.55rem, 3vw, 2.6rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.lead {
  max-width: 820px;
  color: var(--muted);
  font-size: clamp(1rem, 1.5vw, 1.24rem);
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-weight: 800;
}

.primary {
  background: var(--accent);
  color: #111;
  border-color: var(--accent);
}

.secondary {
  background: rgba(255, 255, 255, 0.04);
}

.panel,
.toolbar,
.stratagem-card,
.stratagem-nav-card,
.category-card,
.stats div {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.22);
}

.panel {
  border-radius: 26px;
  padding: clamp(24px, 4vw, 42px);
  margin-bottom: 34px;
}

.concept {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 34px;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 34px 0 70px;
}

.stats div {
  border-radius: 22px;
  padding: 24px;
}

.stats strong {
  display: block;
  font-size: 2.4rem;
  color: var(--accent);
  line-height: 1;
}

.stats span {
  color: var(--muted);
}

.section {
  margin: 70px 0;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.category-card {
  border-radius: 18px;
  padding: 18px;
  cursor: pointer;
  transition: transform 0.18s, border-color 0.18s;
}

.category-card:hover {
  transform: translateY(-3px);
  border-color: rgba(217, 170, 78, 0.55);
}

.category-card strong {
  display: block;
  color: var(--accent);
  margin-bottom: 6px;
}

.category-card span {
  color: var(--muted);
  font-size: 0.92rem;
}

.atlas-section {
  scroll-margin-top: calc(var(--header-height) + 18px);
}

.toolbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px auto;
  gap: 12px;
  align-items: center;
  padding: 14px;
  border-radius: 18px;
  margin: 22px 0;
}

input,
select {
  width: 100%;
  min-height: 48px;
  padding: 13px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(3, 5, 10, 0.72);
  color: var(--text);
  font-size: 1rem;
}

.view-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.toggle-button,
.drawer-close {
  min-height: 44px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-weight: 800;
  cursor: pointer;
}

.toggle-button.active,
.toggle-button:hover,
.drawer-close:hover {
  border-color: rgba(217, 170, 78, 0.72);
  background: rgba(217, 170, 78, 0.16);
  color: var(--accent);
}

.stratagem-workspace {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(420px, 1.1fr);
  gap: 24px;
  height: calc(100dvh - var(--header-height) - 48px);
  min-height: 560px;
  overflow: hidden;
}

.stratagem-navigation,
.stratagem-detail-pane {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-color: rgba(217, 170, 78, 0.52) rgba(255, 255, 255, 0.06);
  scrollbar-width: thin;
}

.stratagem-navigation {
  padding-right: 6px;
}

.stratagem-detail-pane {
  position: sticky;
  top: calc(var(--header-height) + 18px);
  align-self: start;
  max-height: calc(100dvh - var(--header-height) - 48px);
  scroll-margin-top: calc(var(--header-height) + 18px);
}

.stratagem-list {
  display: grid;
  gap: 12px;
}

.stratagem-list.tree-view {
  gap: 18px;
}

.category-group {
  display: grid;
  gap: 10px;
}

.category-heading {
  position: sticky;
  top: 0;
  z-index: 1;
  margin: 0;
  padding: 10px 4px 8px;
  color: var(--accent);
  background: rgba(8, 10, 15, 0.9);
  backdrop-filter: blur(10px);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tree-root {
  border: 1px solid rgba(217, 170, 78, 0.22);
  border-radius: 22px;
  background:
    linear-gradient(180deg, rgba(217, 170, 78, 0.08), rgba(255, 255, 255, 0.025)),
    rgba(18, 22, 32, 0.72);
  padding: 14px;
}

.tree-root + .tree-root {
  margin-top: 4px;
}

.tree-root-summary,
.tree-child-summary {
  cursor: pointer;
  list-style: none;
}

.tree-root-summary::-webkit-details-marker,
.tree-child-summary::-webkit-details-marker {
  display: none;
}

.tree-root-summary {
  display: grid;
  gap: 4px;
  padding: 4px 2px 12px;
}

.tree-root-summary::before {
  content: "▾";
  float: right;
  justify-self: end;
  color: var(--accent);
  font-weight: 900;
}

.tree-root:not([open]) .tree-root-summary::before,
.tree-child:not([open]) .tree-child-summary::before {
  content: "▸";
}

.tree-root-title {
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.tree-root-description {
  color: var(--muted);
  font-size: 0.9rem;
}

.tree-child {
  border: 1px solid rgba(128, 216, 255, 0.16);
  border-radius: 16px;
  background: rgba(3, 5, 10, 0.26);
  padding: 10px;
}

.tree-child + .tree-child {
  margin-top: 10px;
}

.tree-child-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  color: var(--text);
  font-weight: 850;
}

.tree-child-summary::before {
  content: "▾";
  color: var(--accent2);
  font-weight: 900;
}

.count-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 28px;
  height: 24px;
  border-radius: 999px;
  background: rgba(128, 216, 255, 0.12);
  border: 1px solid rgba(128, 216, 255, 0.32);
  color: var(--accent2);
  font-size: 0.78rem;
  font-weight: 900;
}

.tree-child-list {
  display: grid;
  gap: 8px;
  margin-top: 10px;
}

.stratagem-nav-card {
  width: 100%;
  text-align: left;
  border-radius: 18px;
  padding: 16px;
  color: var(--text);
  cursor: pointer;
  transition: transform 0.16s, border-color 0.16s, background 0.16s;
}

.stratagem-nav-card:hover,
.stratagem-nav-card.active {
  transform: translateY(-1px);
  border-color: rgba(217, 170, 78, 0.66);
  background: rgba(217, 170, 78, 0.10);
}

.tree-stratagem-card {
  border-radius: 14px;
  padding: 13px;
  background: rgba(255, 255, 255, 0.035);
  box-shadow: none;
}

.tree-stratagem-card h3 {
  font-size: 1rem;
  margin-top: 8px;
}

.tree-stratagem-card .summary {
  margin: 6px 0 8px;
  color: #e7ded0;
  font-size: 0.88rem;
  line-height: 1.55;
}

.tree-stratagem-card .english {
  margin: 0;
  font-size: 0.84rem;
}

.nav-card-top,
.card-top {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
}

.number {
  color: var(--accent);
  font-weight: 900;
  font-size: 0.86rem;
}

.badge {
  display: inline-block;
  color: var(--accent2);
  border: 1px solid rgba(128, 216, 255, 0.36);
  border-radius: 999px;
  padding: 3px 9px;
  font-size: 0.76rem;
  white-space: nowrap;
}

.stratagem-nav-card h3 {
  margin: 10px 0 2px;
  font-size: 1.15rem;
  line-height: 1.2;
}

.stratagem-nav-card .english,
.stratagem-nav-card .reading {
  margin: 0;
}

.stratagem-card {
  border-radius: 22px;
  padding: clamp(20px, 3vw, 30px);
}

.stratagem-card h3 {
  font-size: clamp(1.8rem, 4vw, 3rem);
  margin: 12px 0 0;
  letter-spacing: 0.04em;
}

.reading {
  color: var(--muted);
  margin: 0 0 8px;
}

.english {
  color: var(--accent);
  font-style: italic;
  margin: 0 0 16px;
}

.summary {
  color: #ede5d8;
  margin-bottom: 18px;
}

.meta {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.meta p {
  margin: 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.meta b {
  color: var(--text);
}

.optional-section {
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.optional-section p {
  border-top: 0;
  padding-top: 0;
}

.breakdown-list {
  margin: 8px 0 0;
  padding-left: 1.2rem;
  color: var(--muted);
}

.note-link {
  display: inline-flex;
  width: fit-content;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 0 16px;
  border: 1px solid rgba(217, 170, 78, 0.58);
  border-radius: 999px;
  color: var(--accent);
  font-weight: 800;
}

.empty-state {
  min-height: 180px;
}

.mobile-detail-drawer {
  display: none;
}

.notes {
  border-color: rgba(217, 170, 78, 0.35);
}

footer {
  width: min(1180px, 92vw);
  margin: 80px auto 0;
  padding: 34px 0;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

@media (max-width: 980px) {
  .concept {
    grid-template-columns: 1fr;
  }

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

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

@media (max-width: 899px) {
  :root {
    --header-height: 116px;
  }

  .site-header {
    align-items: flex-start;
    gap: 12px;
    flex-direction: column;
  }

  .language-switcher {
    position: absolute;
    top: 14px;
    right: 4vw;
  }

  nav {
    flex-wrap: wrap;
    gap: 12px;
  }

  .hero {
    min-height: auto;
  }

  .stats,
  .category-grid {
    grid-template-columns: 1fr;
  }

  .stratagem-workspace {
    display: block;
    height: auto;
    min-height: 0;
    overflow: visible;
  }

  .stratagem-navigation {
    overflow: visible;
    padding-right: 0;
  }

  .stratagem-detail-pane {
    display: none;
  }

  .mobile-detail-drawer {
    position: fixed;
    inset: 0;
    z-index: 60;
    display: none;
  }

  .mobile-detail-drawer.open {
    display: block;
  }

  .mobile-detail-scrim {
    position: absolute;
    inset: 0;
    background: rgba(3, 5, 10, 0.76);
    backdrop-filter: blur(10px);
  }

  .mobile-detail-panel {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-rows: auto minmax(0, 1fr);
    height: 100dvh;
    background:
      radial-gradient(circle at 10% 0%, rgba(217, 170, 78, 0.18), transparent 26rem),
      linear-gradient(180deg, #080a0f, #10131c);
    padding-bottom: env(safe-area-inset-bottom);
  }

  .mobile-detail-bar {
    position: sticky;
    top: 0;
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 60px;
    padding: calc(env(safe-area-inset-top) + 10px) 16px 10px;
    border-bottom: 1px solid var(--line);
    background: rgba(8, 10, 15, 0.92);
    backdrop-filter: blur(16px);
  }

  .drawer-close {
    padding: 0 14px;
  }

  .drawer-number {
    color: var(--accent);
    font-weight: 900;
  }

  .mobile-detail-content {
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    padding: 16px 16px 28px;
    scroll-padding-top: 84px;
  }

  .mobile-detail-content .stratagem-card {
    box-shadow: none;
  }

  footer {
    flex-direction: column;
  }
}