/* Anatomy ICD-10 - application styles.
   Written with CSS logical properties throughout so the Arabic (RTL) locale mirrors
   correctly without a separate stylesheet. */

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  background: var(--bg);
  color: var(--fg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

h1, h2, h3, h4 {
  line-height: 1.25;
  margin-block: 0 0.5em;
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(1.9rem, 4vw, 2.75rem); font-weight: 800; }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); font-weight: 700; }
h3 { font-size: 1.15rem; font-weight: 650; }

p { margin-block: 0 1em; }

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

:focus-visible {
  outline: 2px solid var(--highlight);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  inset-block-start: -100px;
  inset-inline-start: 1rem;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  z-index: 100;
}
.skip-link:focus { inset-block-start: 1rem; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

.page { flex: 1 0 auto; padding-block: 2.5rem 4rem; }

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky;
  inset-block-start: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg-elevated) 88%, transparent);
  backdrop-filter: blur(10px);
  border-block-end: 1px solid var(--border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  min-height: 62px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--fg);
  font-weight: 750;
  letter-spacing: 0.02em;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand__mark { width: 34px; height: 34px; }
.brand__text { display: flex; flex-direction: column; line-height: 1.1; }
.brand__name { font-size: 0.98rem; }
.brand__tag {
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-muted);
  font-weight: 600;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-inline-start: auto;
  flex-wrap: wrap;
}
.site-nav a,
.site-nav .navlink {
  color: var(--fg-muted);
  padding: 0.42rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 550;
}
.site-nav a:hover { background: var(--bg-sunken); color: var(--fg); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--fg); background: var(--bg-sunken); }

/* ---------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1.05rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.08s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn--primary { background: var(--accent); color: var(--accent-fg); }
.btn--primary:hover { background: color-mix(in srgb, var(--accent) 85%, black); }
.btn--ghost { background: transparent; color: var(--fg); border-color: var(--border); }
.btn--ghost:hover { background: var(--bg-sunken); }
.btn--sm { padding: 0.35rem 0.7rem; font-size: 0.82rem; }
.btn--block { width: 100%; }

/* ---------------------------------------------------------------- cards */
.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.4rem;
}
.card--flush { padding: 0; overflow: hidden; }

.grid { display: grid; gap: 1.15rem; }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

.stat { background: var(--bg-elevated); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem 1.15rem; }
.stat__value { font-size: 1.75rem; font-weight: 750; letter-spacing: -0.02em; }
.stat__label { font-size: 0.78rem; color: var(--fg-muted); text-transform: uppercase; letter-spacing: 0.08em; }

/* ---------------------------------------------------------------- badges + code pills */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.16rem 0.55rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  background: var(--bg-sunken);
  color: var(--fg-muted);
  border: 1px solid var(--border);
}
.badge--accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.badge--warn { background: color-mix(in srgb, var(--warning) 16%, transparent); color: var(--warning); border-color: transparent; }
.badge--danger { background: color-mix(in srgb, var(--danger) 14%, transparent); color: var(--danger); border-color: transparent; }
.badge--ok { background: color-mix(in srgb, var(--success) 15%, transparent); color: var(--success); border-color: transparent; }

.code-pill {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  background: var(--highlight-soft);
  color: var(--fg);
  border: 1px solid color-mix(in srgb, var(--highlight) 45%, transparent);
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
}

.code-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-elevated);
  padding: 0.9rem 1rem;
  margin-block-end: 0.7rem;
}
.code-card__head { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.code-card__title { margin-block: 0.45rem 0.2rem; font-weight: 600; font-size: 0.95rem; }
.code-card__advice {
  margin-block-start: 0.6rem;
  padding-inline-start: 0.75rem;
  border-inline-start: 3px solid var(--highlight);
  font-size: 0.85rem;
  color: var(--fg-muted);
}

/* ---------------------------------------------------------------- notice */
.notice {
  border: 1px solid var(--border);
  border-inline-start: 4px solid var(--warning);
  background: var(--bg-sunken);
  border-radius: var(--radius);
  padding: 0.85rem 1.05rem;
  font-size: 0.87rem;
  color: var(--fg-muted);
}
.notice--info { border-inline-start-color: var(--accent); }
.notice strong { color: var(--fg); }

.messages { list-style: none; padding: 0; margin: 0 0 1.5rem; display: grid; gap: 0.5rem; }

/* ---------------------------------------------------------------- forms */
label { display: block; font-size: 0.85rem; font-weight: 600; margin-block-end: 0.3rem; }
input[type="text"], input[type="email"], input[type="password"], input[type="search"], select, textarea {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--fg);
  font: inherit;
  font-size: 0.92rem;
}
.field { margin-block-end: 1rem; }
.helptext { font-size: 0.8rem; color: var(--fg-muted); }
.errorlist { color: var(--danger); font-size: 0.83rem; padding-inline-start: 1rem; }

/* ---------------------------------------------------------------- tables */
.table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.table th, .table td { padding: 0.6rem 0.8rem; text-align: start; border-block-end: 1px solid var(--border); }
.table th { font-size: 0.74rem; text-transform: uppercase; letter-spacing: 0.07em; color: var(--fg-muted); }
.table-wrap { overflow-x: auto; }

/* ---------------------------------------------------------------- hero */
.hero { padding-block: 3.5rem 2rem; }
.hero__lede { font-size: 1.1rem; color: var(--fg-muted); max-width: 62ch; }
.hero__actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-block-start: 1.75rem; }

.pipeline {
  display: grid;
  gap: 0.5rem;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin-block: 1.5rem;
}
.pipeline__step {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.8rem 0.9rem;
}
.pipeline__step b { display: block; font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--fg-muted); }
.pipeline__step span { font-family: var(--font-mono); font-size: 0.86rem; }

/* ---------------------------------------------------------------- explorer */
.explorer {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr) 360px;
  gap: 1rem;
  min-height: calc(100vh - 62px - 190px);
}
@media (max-width: 1100px) {
  .explorer { grid-template-columns: 1fr; }
}
.explorer__panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  overflow-y: auto;
  max-height: 78vh;
}
.explorer__canvas {
  background: var(--viewer-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  min-height: 520px;
}
.explorer__canvas canvas { display: block; touch-action: none; }

.viewer-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 2rem;
  color: #cbd5e1;
}

.system-group { margin-block-end: 0.6rem; }
.system-group__head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  background: none;
  border: 0;
  padding: 0.4rem 0.3rem;
  font: inherit;
  font-weight: 650;
  font-size: 0.85rem;
  color: var(--fg);
  cursor: pointer;
  border-radius: var(--radius-sm);
}
.system-group__head:hover { background: var(--bg-sunken); }
.system-group__list { list-style: none; margin: 0; padding-inline-start: 1.1rem; }
.system-group__list button {
  background: none;
  border: 0;
  padding: 0.28rem 0.35rem;
  font: inherit;
  font-size: 0.84rem;
  color: var(--fg-muted);
  cursor: pointer;
  width: 100%;
  text-align: start;
  border-radius: var(--radius-sm);
}
.system-group__list button:hover { background: var(--bg-sunken); color: var(--fg); }
.system-group__list button[aria-pressed="true"] { color: var(--highlight); font-weight: 650; }

.omnisearch { position: relative; flex: 1 1 260px; max-width: 420px; }
.omnisearch__results {
  position: absolute;
  inset-inline: 0;
  inset-block-start: calc(100% + 4px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  max-height: 340px;
  overflow-y: auto;
  z-index: 50;
  padding: 0.3rem;
}
.omnisearch__group-label {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--fg-muted);
  padding: 0.45rem 0.6rem 0.2rem;
}
.omnisearch__item {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  width: 100%;
  background: none;
  border: 0;
  font: inherit;
  font-size: 0.86rem;
  text-align: start;
  padding: 0.45rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--fg);
}
.omnisearch__item:hover,
.omnisearch__item[aria-selected="true"] { background: var(--bg-sunken); }

.tabs { display: flex; gap: 0.3rem; flex-wrap: wrap; margin-block-end: 0.9rem; }
.tab {
  background: none;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.28rem 0.7rem;
  font: inherit;
  font-size: 0.79rem;
  font-weight: 600;
  color: var(--fg-muted);
  cursor: pointer;
}
.tab[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }

.viewer-toolbar {
  position: absolute;
  inset-block-end: 0.75rem;
  inset-inline-start: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.35rem;
  background: color-mix(in srgb, var(--bg-elevated) 90%, transparent);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem;
  backdrop-filter: blur(8px);
  z-index: 5;
}
.viewer-toolbar button {
  background: none;
  border: 0;
  border-radius: 999px;
  padding: 0.3rem 0.7rem;
  font: inherit;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--fg-muted);
  cursor: pointer;
}
.viewer-toolbar button:hover { background: var(--bg-sunken); color: var(--fg); }

/* ---------------------------------------------------------------- footer */
.site-footer {
  flex-shrink: 0;
  border-block-start: 1px solid var(--border);
  background: var(--bg-elevated);
  padding-block: 2rem;
  font-size: 0.87rem;
}
.site-footer__grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  align-items: start;
}
.site-footer h4 {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--fg-muted);
  margin-block-end: 0.6rem;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem; }
.site-footer a { color: var(--fg-muted); }
.site-footer a:hover { color: var(--fg); }
.site-footer__bottom {
  margin-block-start: 1.75rem;
  padding-block-start: 1.25rem;
  border-block-start: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  color: var(--fg-muted);
}
.site-footer__logo { height: 30px; width: auto; }

.switcher { display: inline-flex; align-items: center; gap: 0.4rem; }
.switcher select {
  width: auto;
  padding: 0.32rem 0.5rem;
  font-size: 0.82rem;
  border-radius: var(--radius-sm);
}

.swatches { display: flex; gap: 0.3rem; flex-wrap: wrap; }
.swatch {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid var(--border);
  cursor: pointer;
  padding: 0;
}
.swatch[aria-pressed="true"] { border-color: var(--fg); box-shadow: 0 0 0 2px var(--bg-elevated), 0 0 0 4px var(--accent); }
.swatch--ocean { background: linear-gradient(135deg, #2563eb, #f7fafc); }
.swatch--midnight { background: linear-gradient(135deg, #6366f1, #0b0f19); }
.swatch--sunset { background: linear-gradient(135deg, #ea580c, #fff8f2); }
.swatch--graphite { background: linear-gradient(135deg, #64748b, #161718); }
.swatch--evergreen { background: linear-gradient(135deg, #15803d, #f5faf6); }
.swatch--orchid { background: linear-gradient(135deg, #a21caf, #fbf7fc); }

.muted { color: var(--fg-muted); }
.mono { font-family: var(--font-mono); }
.stack { display: grid; gap: 1.15rem; }
.row { display: flex; gap: 0.6rem; align-items: center; flex-wrap: wrap; }
.prose { max-width: 72ch; }
.prose h2 { margin-block-start: 2rem; }
.prose ul { padding-inline-start: 1.25rem; }
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

/* ---------------------------------------------------------------- viewer loading */
.viewer-loading {
  position: absolute;
  inset-block-end: 3.6rem;
  inset-inline-start: 50%;
  transform: translateX(-50%);
  z-index: 6;
  text-align: center;
  color: #cbd5e1;
  font-size: 0.8rem;
  pointer-events: none;
}
.viewer-loading__bar {
  width: 180px;
  height: 3px;
  border-radius: 999px;
  background: rgb(148 163 184 / 0.25);
  overflow: hidden;
  margin-inline: auto;
}
.viewer-loading__bar span {
  display: block;
  height: 100%;
  background: var(--highlight);
  transition: width 0.2s ease;
}
.viewer-loading p { margin: 0.4rem 0 0; }

/* ---------------------------------------------------------------- anatomical reference */
.reference {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-sunken);
  padding: 0.75rem;
  margin-block-end: 1rem;
}
.reference__title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--fg-muted);
  margin: 0 0 0.5rem;
  font-weight: 700;
}
.reference__image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.reference__empty {
  margin: 0;
  font-size: 0.8rem;
  color: var(--fg-muted);
  padding: 0.9rem 0.6rem;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
}
.reference__source {
  margin: 0.55rem 0 0;
  font-size: 0.76rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}