:root {
  color-scheme: light;
  --ink: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --line-strong: #cbd5e1;
  --accent: #0f766e;
  --accent-hover: #0d9488;
  --accent-soft: rgba(15, 118, 110, 0.1);
  --accent-glow: rgba(15, 118, 110, 0.18);
  --paper: #f8fafc;
  --paper-warm: #f1f5f9;
  --panel: #ffffff;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow: 0 8px 30px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 16px 40px rgba(15, 23, 42, 0.08);
  --radius: 14px;
  --radius-lg: 18px;
  --sans: "Segoe UI", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --tap: 44px;
  --track-dsa: #4f46e5;
  --track-dsa-soft: rgba(79, 70, 229, 0.1);
  --track-lld: #c2410c;
  --track-lld-soft: rgba(194, 65, 12, 0.1);
  --track-hld: #2563eb;
  --track-hld-soft: rgba(37, 99, 235, 0.1);
  --track-sd: #0f766e;
  --track-sd-soft: rgba(15, 118, 110, 0.1);
  --track-hi: #7c3aed;
  --track-hi-soft: rgba(124, 58, 237, 0.1);
  --track-res: #475569;
  --track-res-soft: rgba(71, 85, 105, 0.1);
  --code-bg: #0f172a;
  --code-fg: #e2e8f0;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--paper);
  background-image:
    linear-gradient(rgba(15, 118, 110, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 118, 110, 0.03) 1px, transparent 1px),
    radial-gradient(ellipse 90% 60% at 0% -10%, rgba(15, 118, 110, 0.12), transparent 55%),
    radial-gradient(ellipse 70% 50% at 100% 0%, rgba(37, 99, 235, 0.08), transparent 50%),
    radial-gradient(ellipse 60% 40% at 50% 100%, rgba(124, 58, 237, 0.05), transparent 45%);
  background-size: 32px 32px, 32px 32px, auto, auto, auto;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

body,
.shell,
.panel,
.article,
.card,
.note-list li,
.note-list a {
  min-width: 0;
}

p,
li,
td,
th,
.subtitle,
.simple-summary,
.callout {
  overflow-wrap: anywhere;
}

a {
  color: var(--accent-hover);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

.shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 16px 0 56px;
}

.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
  padding: 14px 18px;
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm), var(--shadow);
  position: sticky;
  top: 10px;
  z-index: 50;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
  flex-shrink: 0;
}

.brand small {
  color: var(--accent);
  font: 700 10px/1.2 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.brand strong {
  font: 700 22px/1.15 var(--sans);
  letter-spacing: -0.03em;
  background: linear-gradient(135deg, var(--ink) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  max-width: 100%;
  padding-bottom: 2px;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 8px 14px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.nav a:hover {
  background: var(--paper-warm);
  color: var(--ink);
  text-decoration: none;
}

.nav a.active {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(15, 118, 110, 0.14), rgba(15, 118, 110, 0.08));
  color: var(--accent);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
  text-decoration: none;
}

.hero {
  padding: 8px 0 4px;
}

.hero-panel {
  padding: clamp(24px, 4vw, 36px);
  margin-bottom: 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.95) 0%, rgba(248, 250, 252, 0.9) 100%);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.hero-panel::before {
  content: "";
  position: absolute;
  inset: 0 auto auto 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--track-sd), var(--track-hld), var(--track-hi));
}

.hero-panel h1 {
  margin: 0;
  max-width: 14ch;
  font: 700 clamp(32px, 7vw, 48px)/1.05 var(--sans);
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero-panel p {
  max-width: 48ch;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2.5vw, 18px);
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.hero-stat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}

.hero-stat em {
  font-style: normal;
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font: 700 11px/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 16ch;
  font: 700 clamp(32px, 7vw, 52px)/1.05 var(--sans);
  letter-spacing: -0.03em;
}

.hero p {
  max-width: 52ch;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: clamp(16px, 2.5vw, 18px);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr));
  gap: 16px;
  margin-top: 20px;
}

.card {
  display: flex;
  flex-direction: column;
  padding: 20px 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow-sm);
  color: inherit;
  text-decoration: none;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--card-accent, var(--accent));
  opacity: 0.85;
}

.card:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
  text-decoration: none;
}

.card:active {
  transform: translateY(0);
}

.card-tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--card-soft, var(--accent-soft));
  color: var(--card-accent, var(--accent));
  font: 700 10px/1 var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  width: fit-content;
}

.card h2 {
  margin: 0 0 8px;
  font: 700 20px/1.2 var(--sans);
  letter-spacing: -0.02em;
}

.card p {
  margin: 0;
  flex: 1;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.55;
}

.card .meta {
  display: inline-block;
  margin-top: 16px;
  padding: 5px 10px;
  border-radius: 999px;
  background: var(--paper-warm);
  color: var(--muted);
  font: 600 11px/1 var(--mono);
}

.card-track-dsa { --card-accent: var(--track-dsa); --card-soft: var(--track-dsa-soft); }
.card-track-lld { --card-accent: var(--track-lld); --card-soft: var(--track-lld-soft); }
.card-track-hld { --card-accent: var(--track-hld); --card-soft: var(--track-hld-soft); }
.card-track-sd { --card-accent: var(--track-sd); --card-soft: var(--track-sd-soft); }
.card-track-hi { --card-accent: var(--track-hi); --card-soft: var(--track-hi-soft); }
.card-track-res { --card-accent: var(--track-res); --card-soft: var(--track-res-soft); }

.panel {
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, #ffffff 0%, #fcfdfe 100%);
  box-shadow: var(--shadow);
}

.panel h1 {
  margin: 0 0 8px;
  font: 700 clamp(28px, 5vw, 38px)/1.08 var(--sans);
  letter-spacing: -0.03em;
}

.panel .subtitle {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.55;
}

.note-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.note-list a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: var(--tap);
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: inherit;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.note-list a:hover {
  border-color: var(--accent);
  background: linear-gradient(180deg, #fff, var(--accent-soft));
  box-shadow: var(--shadow);
  text-decoration: none;
}

.note-list strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
}

.note-list a > div > div {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 400;
}

.note-list span {
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
  opacity: 0.7;
}

.note-list a:hover span {
  opacity: 1;
}

.article {
  max-width: 720px;
}

.article h2 {
  margin: 32px 0 12px;
  font: 700 clamp(22px, 4vw, 26px)/1.25 var(--sans);
  letter-spacing: -0.02em;
}

.article h3 {
  margin: 22px 0 10px;
  font: 700 17px/1.35 var(--sans);
  color: var(--ink);
}

.article p,
.article li {
  color: var(--ink);
  font-size: 16px;
}

.article ul,
.article ol {
  margin: 10px 0 16px;
  padding-left: 22px;
}

.article li {
  margin: 6px 0;
}

.article .lead {
  color: var(--muted);
  font-size: 17px;
}

.callout {
  margin: 18px 0;
  padding: 14px 16px;
  border-left: 4px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: linear-gradient(90deg, var(--accent-soft), rgba(255, 255, 255, 0.5));
}

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin: 16px 0 22px;
  border: 1px solid var(--line);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: 14px;
}

th,
td {
  padding: 11px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: linear-gradient(180deg, var(--accent-soft), rgba(255, 255, 255, 0.5));
  font-weight: 700;
  color: var(--ink);
}

tr:nth-child(even) td {
  background: #f8fafc;
}

.empty {
  padding: 24px;
  border: 1px dashed var(--line-strong);
  border-radius: 12px;
  color: var(--muted);
  text-align: center;
  background: var(--paper-warm);
}

.revision-box {
  margin-top: 36px;
  padding: 20px 22px;
  border: 1px solid rgba(15, 118, 110, 0.25);
  border-radius: var(--radius);
  background: linear-gradient(145deg, rgba(15, 118, 110, 0.08) 0%, #ffffff 55%);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.revision-box h2 {
  margin: 0 0 12px;
  font: 700 17px/1.2 var(--sans);
  color: var(--accent);
  letter-spacing: -0.01em;
}

.revision-box ul {
  margin: 0;
  padding-left: 20px;
}

.revision-box li {
  margin: 7px 0;
  font-size: 15px;
}

.simple-summary {
  margin: 0 0 20px;
  padding: 14px 16px 14px 18px;
  border: 1px solid rgba(15, 118, 110, 0.15);
  border-left: 4px solid var(--accent);
  border-radius: 0 12px 12px 0;
  background: linear-gradient(90deg, var(--accent-soft), rgba(255, 255, 255, 0.6));
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

.simple-summary strong {
  color: var(--accent);
}

.code {
  margin: 14px 0;
  padding: 16px;
  border: 1px solid #1e293b;
  border-radius: 12px;
  background: var(--code-bg);
  color: var(--code-fg);
  font: 13px/1.55 var(--mono);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  white-space: pre-wrap;
  word-break: break-word;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.section-heading {
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--line);
  font: 700 17px/1.2 var(--sans);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.admin-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.field-hint {
  margin: -6px 0 10px;
  font-size: 13px;
  color: var(--muted);
  font-weight: 400;
}

.article-body ul {
  margin: 12px 0 18px;
  padding-left: 22px;
}

.article-body code,
.article code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #e2e8f0;
  color: #0f172a;
  padding: 2px 6px;
  border-radius: 5px;
}

.article-body h2 {
  margin-top: 28px;
}

.article-body h3 {
  margin-top: 20px;
}

.footer {
  margin-top: 36px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.install-hint {
  display: none;
  margin: 18px 0 0;
  padding: 12px 14px;
  border: 1px dashed var(--accent);
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--ink);
  font-size: 14px;
}

.install-hint.show {
  display: block;
}

.install-hint button {
  margin-left: 8px;
  min-height: 36px;
  padding: 6px 12px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: #fff;
  color: var(--accent);
  font: 600 13px/1 var(--sans);
  cursor: pointer;
}

.sticky-jump {
  position: sticky;
  top: 72px;
  z-index: 30;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 10px 0 12px;
  margin: 0 0 12px;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.sticky-jump::-webkit-scrollbar {
  display: none;
}

.jump-nav-btn,
.sticky-jump a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--muted);
  font: 600 12px/1.2 var(--sans);
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
  cursor: pointer;
  transition: all 0.15s ease;
}

.jump-nav-btn:hover,
.sticky-jump a:hover {
  border-color: var(--line-strong);
  color: var(--ink);
  text-decoration: none;
}

.jump-nav-btn.active,
.sticky-jump a.active {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px var(--accent-glow);
  text-decoration: none;
}

.panel-head-compact .subtitle {
  margin-bottom: 12px;
}

.panel-head-compact .simple-summary {
  margin-bottom: 12px;
  padding: 10px 12px;
  font-size: 14px;
}

.compact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.compact-grid a {
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  min-height: 0;
  padding: 12px 12px;
  border-radius: 10px;
}

.compact-grid strong {
  font-size: 13px;
  line-height: 1.35;
}

.compact-grid a > div > div {
  display: none;
}

.compact-grid span {
  display: none;
}

.resource-hub .resource-section {
  scroll-margin-top: 88px;
}

#sd-start,
#sd-core,
#sd-blocks,
#sd-designs {
  scroll-margin-top: 88px;
}

.resource-hub .section-heading {
  margin: 18px 0 8px;
  font-size: 16px;
  border-bottom-width: 1px;
}

.resource-hub .note-list:not(.compact-grid) a {
  padding: 11px 14px;
}

.resource-hub .note-list:not(.compact-grid) a > div > div {
  font-size: 12px;
  line-height: 1.4;
}

@media (max-width: 720px) {
  .shell {
    width: calc(100% - 20px);
    padding: 10px 0 40px;
  }

  .topbar {
    top: 0;
    border-radius: 0 0 var(--radius) var(--radius);
    margin-bottom: 16px;
    padding: 12px 14px;
  }

  .hero-panel {
    padding: 20px 18px;
  }

  .hero-stats {
    gap: 8px;
  }

  .hero-stat {
    font-size: 12px;
    padding: 7px 12px;
  }

  .nav a {
    font-size: 12px;
    padding: 8px 12px;
  }

  .panel {
    padding: 16px;
    border-radius: var(--radius);
  }

  .note-list a {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .note-list span {
    align-self: flex-end;
  }

  .card {
    padding: 16px;
  }

  .revision-box {
    padding: 16px;
  }

  .sticky-jump {
    top: 0;
  }

  .resource-hub[data-resource-tabs] .resource-section {
    display: none;
  }

  .resource-hub[data-resource-tabs] .resource-section.active {
    display: block;
  }

  .resource-hub .note-list:not(.compact-grid) a {
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .resource-hub .note-list:not(.compact-grid) span {
    align-self: center;
  }

  .hub-long .note-list a > div > div {
    display: none;
  }

  .hub-long .note-list a {
    flex-direction: row;
    align-items: center;
    padding: 12px 14px;
  }

  .hub-long .note-list span {
    align-self: center;
  }

  .hub-long .section-heading {
    margin-top: 16px;
  }

  .sticky-jump .jump-anchor {
    display: none;
  }
}

@media (min-width: 721px) {
  .resource-hub[data-resource-tabs] .resource-section {
    display: block;
  }

  .jump-nav-btn[data-tab] {
    display: none;
  }

  .sticky-jump .jump-anchor {
    display: inline-flex;
  }

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

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

  .card,
  .nav a,
  .jump-nav-btn,
  .note-list a {
    transition: none;
  }

  .card:hover {
    transform: none;
  }
}