/* ═══════════════════════════════════════════════════════════════════════
   HOLISTIC SMART BRAND DESIGN SYSTEM — DOCS LAYOUT (docs.css)
═══════════════════════════════════════════════════════════════════════ */

/* ── 1. MAIN DOCS LAYOUT ── */
.docs {
  display: flex;
  width: 100%;
  max-width: var(--maxw-wide);
  margin-inline: auto;
  min-height: calc(100vh - 72px);
}

/* ── 2. STICKY LEFT SIDE RAIL ── */
.rail {
  width: var(--rail-w);
  flex-shrink: 0;
  padding: var(--sp-8) var(--sp-6) var(--sp-12) var(--gutter);
  position: sticky;
  top: 72px;
  height: calc(100vh - 72px);
  overflow-y: auto;
  border-right: 1px solid var(--line);
}

.rail-group {
  margin-bottom: var(--sp-6);
}

.rail-group h2 {
  font-family: var(--ff-mono);
  font-size: 11px;
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-eyebrow);
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: var(--sp-3);
}

.rail-group ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rail-group li a {
  display: block;
  font-size: 13.5px;
  color: var(--body);
  padding: 6px 10px;
  border-radius: var(--rad-sm);
  text-decoration: none;
  transition: all var(--t-fast);
  border-left: 2px solid transparent;
}

.rail-group li a:hover {
  color: var(--navy);
  background: var(--bg-soft);
}

.rail-group li a.active {
  color: var(--navy);
  font-weight: var(--fw-bold);
  background: var(--navy-tint);
  border-left-color: var(--sky);
}

.rail-scrim {
  display: none;
}

/* ── 3. MAIN CONTENT CONTAINER ── */
.content {
  flex: 1;
  min-width: 0;
  padding-bottom: var(--sp-12);
}

/* ── 4. PAGE HEADER ── */
.page-head {
  padding-top: clamp(36px, 5vw, 56px);
  padding-bottom: clamp(32px, 4vw, 44px);
  background: #fff;
  border-bottom: 1px solid var(--line);
}

.crumb {
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--muted);
  margin-bottom: var(--sp-3);
}

.crumb a {
  color: var(--body);
  text-decoration: none;
}
.crumb a:hover {
  color: var(--sky-dark);
}

.page-head h1 {
  font-size: var(--fs-h1);
  margin-bottom: var(--sp-3);
}

.page-head .lead {
  max-width: 68ch;
  margin-bottom: var(--sp-4);
}

.page-meta {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
}

/* ── 5. DOCUMENTATION SECTIONS ── */
.doc-section {
  padding-top: clamp(48px, 6vw, 72px);
  padding-bottom: clamp(48px, 6vw, 72px);
  border-bottom: 1px solid var(--line);
}

.doc-section--soft {
  background: var(--bg-soft);
}

.doc-section--navy {
  background: var(--navy);
  color: #DDE8F8;
}
.doc-section--navy h2, .doc-section--navy h3 {
  color: #fff;
}
.doc-section--navy .sec-intro {
  color: #ABC5E8;
}

.doc-section h2 {
  font-size: var(--fs-h2);
  margin-bottom: var(--sp-2);
}

.sec-intro {
  font-size: var(--fs-lead);
  color: var(--body);
  max-width: 68ch;
  line-height: var(--lh-relaxed);
  margin-bottom: var(--sp-7);
}

.block {
  margin-top: var(--sp-8);
}

.block h3 {
  font-size: 18px;
  margin-bottom: var(--sp-2);
}

.block p {
  font-size: 14.5px;
  color: var(--body);
  line-height: 1.6;
}

/* ── 6. TYPOGRAPHY TESTER & PLAYGROUND ── */
.type-tester {
  border: 1px solid var(--line);
  border-radius: var(--rad-lg);
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow-sm);
  margin-top: var(--sp-6);
}

.tester-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-4);
  padding: 14px 20px;
  background: var(--bg-soft);
  border-bottom: 1px solid var(--line);
}

.control-group {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--ff-mono);
  font-size: 12px;
  color: var(--ink);
}

.control-group select, .control-group input[type="range"] {
  accent-color: var(--sky);
}

.control-group select {
  font-family: var(--ff-body);
  font-size: 13px;
  padding: 4px 8px;
  border-radius: var(--rad-sm);
  border: 1px solid var(--line);
  background: #fff;
}

.tester-preview {
  padding: var(--sp-8);
  outline: none;
  min-height: 140px;
  font-family: var(--ff-display);
  font-size: 32px;
  line-height: 1.3;
  color: var(--ink);
  word-break: break-word;
}

/* ── 7. RESPONSIVE MEDIA QUERIES FOR DOCS ── */
@media (max-width: 980px) {
  .rail {
    position: fixed;
    top: 72px;
    left: -280px;
    z-index: 999;
    width: 260px;
    background: #fff;
    box-shadow: 10px 0 30px rgba(0,0,0,0.15);
    transition: left var(--t-base) var(--ease);
  }

  .rail.open {
    left: 0;
  }

  .rail-scrim.open {
    display: block;
    position: fixed;
    inset: 72px 0 0 0;
    z-index: 998;
    background: rgba(7, 27, 62, 0.4);
    backdrop-filter: blur(4px);
  }
}