* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  line-height: 1.55;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(15, 139, 141, 0.2), transparent 34%),
    radial-gradient(circle at 84% 8%, rgba(239, 107, 59, 0.16), transparent 24%),
    linear-gradient(165deg, var(--bg) 0%, var(--bg-accent) 100%);
}

main {
  margin-top: 1.75rem;
}

button,
select {
  font: inherit;
}

code,
pre {
  font-family: var(--font-mono);
}

a {
  color: inherit;
}

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

a:focus-visible,
button:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.page-shell {
  width: min(var(--content-width), calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(1rem, 3vw, var(--space-5)) 0 3.25rem;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(1.4rem, 4vw, 2.35rem);
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: calc(var(--radius) + 6px);
  background:
    linear-gradient(135deg, rgba(255, 254, 249, 0.96), rgba(255, 255, 255, 0.76)),
    rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -8% -32% auto;
  width: 16rem;
  height: 16rem;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(239, 107, 59, 0.16), transparent 66%);
  pointer-events: none;
}

.eyebrow {
  position: relative;
  z-index: 1;
  margin: 0;
  color: var(--accent-strong);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

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

.eyebrow a:hover,
.eyebrow a:focus-visible {
  text-decoration: underline;
}

.section-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.72rem;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  position: relative;
  z-index: 1;
  margin: 1rem 0 0;
  max-width: 13ch;
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.hero-copy {
  position: relative;
  z-index: 1;
  margin: 1rem 0 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.75;
}

.meta-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1rem;
}

.meta-chip {
  padding: 0.38rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
  line-height: 1.2;
}

.library-panel,
.sidebar-panel,
.empty-state {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.library-panel {
  margin-top: 0;
  padding: clamp(1.25rem, 3vw, 1.8rem);
}

.panel-header {
  margin-bottom: 1.15rem;
}

.section-kicker {
  margin-bottom: 0.7rem;
  border: 1px solid rgba(239, 107, 59, 0.12);
  background: var(--accent-warm-soft);
  color: var(--accent-warm-strong);
}

.panel-header h2,
.sidebar-panel h2 {
  margin: 0;
  font-size: 1.22rem;
  letter-spacing: -0.02em;
}

.panel-copy,
.utility-note,
.filter-helper {
  margin: 0.42rem 0 0;
  max-width: 42rem;
  color: var(--muted);
  line-height: 1.7;
}

.filter-bar {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem 1.1rem;
  margin-bottom: 1.45rem;
  padding: 1.15rem;
  border: 1px solid rgba(11, 95, 99, 0.16);
  border-radius: 20px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(245, 251, 248, 0.96));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.68);
}

.filter-field {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.filter-field-wide {
  grid-column: 1 / -1;
}

.filter-field-primary {
  padding: 0.9rem;
  border: 1px solid rgba(11, 95, 99, 0.12);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
  transition: border-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}

.filter-field-primary[data-active="true"] {
  border-color: rgba(11, 95, 99, 0.28);
  box-shadow: 0 16px 28px rgba(15, 139, 141, 0.08);
  transform: translateY(-1px);
}

.filter-field-topics {
  padding-top: 0.2rem;
}

.filter-field-topics[data-active="true"] .filter-heading-block {
  color: var(--text);
}

.filter-label {
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.filter-select {
  min-height: 2.75rem;
  padding: 0.72rem 0.9rem;
  border: 1px solid rgba(11, 95, 99, 0.2);
  border-radius: 10px;
  background: var(--surface-strong);
  color: var(--text);
  transition: border-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}

.filter-select[data-active="true"] {
  border-color: rgba(11, 95, 99, 0.3);
  box-shadow: inset 0 3px 0 rgba(239, 107, 59, 0.7);
}

.filter-select:hover,
.filter-select:focus-visible {
  border-color: rgba(11, 95, 99, 0.38);
  box-shadow: 0 0 0 4px rgba(15, 139, 141, 0.08);
}

.filter-toolbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.filter-heading-block {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.filter-count-chip {
  display: inline-flex;
  align-items: center;
  min-height: 1.6rem;
  padding: 0.12rem 0.5rem;
  border-radius: 999px;
  background: rgba(11, 95, 99, 0.1);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.filter-reset {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  align-self: flex-start;
  min-height: 1.5rem;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color 140ms ease, opacity 140ms ease;
}

.filter-reset::before {
  content: "↺";
  color: var(--accent-warm-strong);
  opacity: 0.68;
}

.filter-reset:disabled {
  opacity: 0.42;
  cursor: default;
}

.filter-reset:hover,
.filter-reset:focus-visible {
  color: var(--accent-strong);
}

.filter-helper {
  margin-top: 0.15rem;
  font-size: 0.92rem;
  max-width: 44rem;
}

.filter-topic-summary {
  margin: -0.1rem 0 0;
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1.55;
}

.filter-tag-list {
  display: grid;
  gap: 0.85rem;
}

.filter-tag-group {
  display: grid;
  gap: 0.55rem;
}

.filter-tag-group-secondary {
  padding-top: 0.2rem;
  border-top: 1px solid rgba(11, 95, 99, 0.1);
}

.filter-tag-group-header {
  display: grid;
  gap: 0.14rem;
}

.filter-tag-group-title {
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.filter-tag-group-copy {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.45;
}

.filter-tag-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 0.58rem;
}

.filter-tag {
  min-height: 2.35rem;
  padding: 0.48rem 0.82rem;
  border: 1px solid rgba(11, 95, 99, 0.18);
  border-radius: 12px;
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
  font-weight: 700;
  transition:
    background 140ms ease,
    color 140ms ease,
    border-color 140ms ease,
    transform 140ms ease,
    box-shadow 140ms ease;
}

.filter-tag:hover,
.filter-tag:focus-visible {
  border-color: rgba(11, 95, 99, 0.36);
  box-shadow: 0 12px 18px rgba(15, 139, 141, 0.08);
  transform: translateY(-1px);
}

.filter-tag[aria-pressed="true"] {
  border-color: rgba(11, 95, 99, 0.6);
  background: linear-gradient(160deg, var(--accent-strong), #083d40);
  color: #f7fffd;
  box-shadow:
    inset 0 3px 0 rgba(239, 107, 59, 0.8),
    0 14px 24px rgba(15, 139, 141, 0.2);
}

.filter-tag-priority {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(247, 252, 249, 0.92));
}

.filter-tag-secondary {
  background: rgba(255, 255, 255, 0.66);
  color: var(--muted);
}

.filter-tag-label {
  display: block;
}

.filter-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  align-self: flex-start;
  margin-top: 0.1rem;
  min-height: 2.45rem;
  padding: 0.55rem 0.9rem;
  border: 1px solid rgba(11, 95, 99, 0.18);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--accent-strong);
  cursor: pointer;
  font-weight: 800;
  transition: border-color 140ms ease, box-shadow 140ms ease, transform 140ms ease;
}

.filter-toggle::after {
  content: "▾";
  color: var(--accent-warm-strong);
  transition: transform 140ms ease;
}

.filter-toggle:hover,
.filter-toggle:focus-visible {
  border-color: rgba(11, 95, 99, 0.34);
  box-shadow: 0 12px 22px rgba(15, 139, 141, 0.08);
  transform: translateY(-1px);
}

.filter-toggle[aria-expanded="true"]::after {
  transform: rotate(180deg);
}

.filter-toggle[hidden] {
  display: none;
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 290px), 1fr));
  gap: 1.15rem;
}

.empty-state {
  padding: 1.25rem;
}

.doc-link,
.secondary-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.55rem;
  appearance: none;
  cursor: pointer;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  transition:
    transform 140ms ease,
    background 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease,
    color 140ms ease;
}

.doc-link {
  border: 0;
  padding: 0.7rem 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #f7fffd;
  box-shadow: 0 12px 22px rgba(15, 139, 141, 0.18);
}

.doc-link:hover,
.doc-link:focus-visible {
  transform: translateY(-1px);
  box-shadow: 0 16px 28px rgba(15, 139, 141, 0.22);
}

.secondary-link {
  padding: 0.68rem 0.95rem;
  border: 1px solid rgba(11, 95, 99, 0.18);
  background: var(--surface-strong);
  color: var(--accent-strong);
}

.secondary-link:hover,
.secondary-link:focus-visible {
  border-color: rgba(11, 95, 99, 0.34);
  box-shadow: 0 12px 22px rgba(15, 139, 141, 0.08);
  transform: translateY(-1px);
}

.empty-state {
  color: var(--muted);
  line-height: 1.65;
}

.document-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--sidebar-width)) minmax(0, 1fr);
  gap: 1.4rem;
  margin-top: 1.5rem;
}

.sidebar-panel {
  align-self: start;
  position: sticky;
  top: 1rem;
  padding: 1.05rem 1.1rem;
}

.sidebar-section {
  margin: 0;
}

.sidebar-section + .sidebar-section {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.sidebar-section[hidden] {
  display: none;
}

.sidebar-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  cursor: pointer;
  list-style: none;
}

.sidebar-summary::-webkit-details-marker {
  display: none;
}

.sidebar-summary::after {
  content: "▾";
  flex-shrink: 0;
  color: var(--muted);
  font-size: 0.82rem;
  transition: transform 140ms ease, color 140ms ease;
}

.sidebar-summary:hover::after,
.sidebar-summary:focus-visible::after {
  color: var(--accent-strong);
}

.sidebar-disclosure[open] > .sidebar-summary {
  margin-bottom: 0.75rem;
}

.sidebar-disclosure[open] > .sidebar-summary::after {
  transform: rotate(180deg);
}

.sidebar-summary h2 {
  margin: 0;
  font-size: 1rem;
}

.sidebar-chip-row {
  margin-top: 0;
}

.document-toc {
  margin-top: 0;
}

.toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc-list li + li {
  margin-top: 0.45rem;
}

.toc-link {
  display: inline-block;
  text-decoration: none;
  color: var(--muted);
  line-height: 1.55;
}

.toc-link[data-depth="3"] {
  padding-left: 0.9rem;
  font-size: 0.95rem;
}

.toc-link:hover,
.toc-link:focus-visible {
  color: var(--accent-strong);
}

.document-panel {
  padding: clamp(1.25rem, 4vw, 1.9rem);
}

.document-body {
  min-height: 320px;
}

.document-body > *:first-child {
  margin-top: 0;
}

.document-placeholder {
  max-width: var(--reading-width);
  margin: 0 auto;
}

.document-placeholder strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 0.4rem;
  color: var(--text);
}

.document-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1rem;
}

@media (max-width: 920px) {
  .filter-bar {
    grid-template-columns: 1fr;
  }

  .document-layout {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .sidebar-panel {
    order: 2;
    position: static;
  }

  .document-panel {
    order: 1;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(100% - 1rem, var(--content-width));
    padding-top: 0.75rem;
  }

  main {
    margin-top: 1rem;
  }

  .hero,
  .library-panel,
  .document-panel,
  .sidebar-panel,
  .empty-state {
    padding: 1rem;
  }

  .hero h1 {
    font-size: clamp(2.15rem, 12vw, 3.2rem);
  }

  .hero-copy {
    font-size: 0.98rem;
  }

  .filter-bar {
    gap: 0.85rem;
  }

  .document-actions,
  .filter-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .doc-link,
  .secondary-link,
  .filter-select {
    width: 100%;
  }

  .filter-toggle {
    width: auto;
  }

  .filter-tag {
    min-height: 2.5rem;
  }
}