:root {
  --bg-alabaster: #F8F7F4;
  --bg-paper: #FCFBF8;
  --bg-stone: #EFECE5;
  --bg-stone-subtle: #F4F1EA;
  --border-sand: #E2DCD0;
  --border-strong: #CBC2B2;
  --ink-primary: #1C1916;
  --ink-secondary: #575148;
  --ink-muted: #847D72;
  --sage-primary: #2D4739;
  --sage-dark: #1E3328;
  --sage-tint: #EBF1ED;
  --sage-border: #BFD1C7;
  --clay-primary: #9A523C;
  --clay-tint: #F6EBE6;
  --clay-border: #DFC2B6;
  --spring-red: #BF4330;
  --spring-blue: #366885;
  --spring-green: #2D4739;
  --spring-yellow: #C4922C;
  --font-serif: 'Cormorant Garamond', Georgia, serif;
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --shadow-card: 0 2px 12px rgba(28, 25, 21, 0.05);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 12px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

html, body {
  background-color: var(--bg-alabaster);
  color: var(--ink-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--sage-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--clay-primary);
}

/* Masthead */
.guide-header {
  background: rgba(252, 251, 248, 0.96);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-sand);
  padding: 0 2rem;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 40;
}

.guide-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--ink-primary);
}

.guide-brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--sage-primary);
  color: #FCFBF8;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 600;
}

.guide-brand-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.guide-brand-sub {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-muted);
}

.guide-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.guide-nav a {
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink-secondary);
}

.guide-nav a:hover,
.guide-nav a.active {
  color: var(--ink-primary);
}

.btn-workbench {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--sage-primary);
  color: #FCFBF8 !important;
  text-decoration: none !important;
  padding: 0.58rem 1.1rem;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 600;
  transition: background 0.15s ease;
}

.btn-workbench:hover {
  background: var(--sage-dark);
}

.btn-outline-studio {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  background: var(--bg-paper);
  color: var(--sage-primary) !important;
  border: 1px solid var(--sage-border);
  text-decoration: none !important;
  padding: 0.56rem 1.05rem;
  border-radius: var(--radius-sm);
  font-size: 0.84rem;
  font-weight: 600;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.btn-outline-studio:hover {
  border-color: var(--sage-primary);
  background: var(--sage-tint);
}

/* Containers */
.exercise-shell {
  max-width: 960px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4.5rem;
}

.hub-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4.5rem;
}

.breadcrumb {
  font-size: 0.78rem;
  color: var(--ink-muted);
  margin-bottom: 1.35rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  align-items: center;
}

.breadcrumb a {
  color: var(--ink-secondary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--clay-primary);
  font-weight: 500;
  margin-bottom: 0.45rem;
}

h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.05rem, 4vw, 2.85rem);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.015em;
  color: var(--ink-primary);
  margin-bottom: 0.9rem;
}

.lead {
  font-size: 1.04rem;
  color: var(--ink-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
}

h2 {
  font-family: var(--font-serif);
  font-size: 1.72rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink-primary);
  margin: 2.5rem 0 0.85rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-sand);
}

h3 {
  font-family: var(--font-sans);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--ink-primary);
  margin: 1.25rem 0 0.4rem;
}

p {
  margin-bottom: 0.95rem;
  color: var(--ink-secondary);
}

ul, ol {
  margin: 0 0 1.15rem 1.3rem;
  color: var(--ink-secondary);
}

li {
  margin-bottom: 0.42rem;
}

li strong {
  color: var(--ink-primary);
}

/* Exercise Hero Split & Architectural Plate */
.exercise-hero {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 1.5rem;
  align-items: stretch;
  margin-bottom: 1.25rem;
}

.hero-plate-box {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.1rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  text-align: center;
  color: var(--sage-primary);
}

.hero-plate-caption {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  width: 100%;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-sand);
}

/* 4-Cell Studio Specification Strip */
.spec-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
  overflow: hidden;
}

.spec-cell {
  padding: 0.9rem 1.05rem;
  border-right: 1px solid var(--border-sand);
}

.spec-cell:last-child {
  border-right: none;
}

.spec-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-bottom: 0.25rem;
}

.spec-value {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--ink-primary);
  line-height: 1.35;
}

/* Hardware & Spring Table */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  margin: 1.15rem 0 1.85rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  text-align: left;
}

th {
  background: var(--bg-stone);
  color: var(--ink-primary);
  font-weight: 700;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-sand);
}

td {
  padding: 0.78rem 1rem;
  border-bottom: 1px solid var(--border-sand);
  color: var(--ink-secondary);
  vertical-align: top;
}

tr:last-child td {
  border-bottom: none;
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.81rem;
  color: var(--ink-primary);
}

.spring-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  background: var(--bg-alabaster);
  border: 1px solid var(--border-sand);
  border-radius: 999px;
  padding: 0.16rem 0.58rem;
  color: var(--ink-primary);
  white-space: nowrap;
}

.safety-flag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  color: var(--clay-primary);
  background: var(--clay-tint);
  border: 1px solid var(--clay-border);
  border-radius: var(--radius-sm);
  padding: 0.14rem 0.5rem;
  margin-right: 0.35rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}
.dot.red { background: var(--spring-red); }
.dot.blue { background: var(--spring-blue); }
.dot.green { background: var(--spring-green); }
.dot.yellow { background: var(--spring-yellow); }

/* Biomechanics & Execution Panels */
.biomech-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.15rem;
  margin: 1.15rem 0 1.5rem;
}

.studio-panel {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.3rem 1.4rem;
  box-shadow: var(--shadow-card);
}

.studio-panel h3 {
  margin-top: 0;
  margin-bottom: 0.55rem;
  font-family: var(--font-serif);
  font-size: 1.32rem;
  font-weight: 600;
}

.studio-panel p:last-child,
.studio-panel ul:last-child,
.studio-panel ol:last-child {
  margin-bottom: 0;
}

.execution-card {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-left: 3px solid var(--sage-primary);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 1.85rem;
}

.execution-card h3 {
  margin-top: 0;
}

/* 3-Level Scaling Matrix */
.scaling-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.15rem 0 1.5rem;
}

.scaling-card {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}

.scaling-card.level-mid {
  border-top: 3px solid var(--sage-primary);
}

.scaling-card.level-adv {
  border-top: 3px solid var(--clay-primary);
}

.scaling-card.level-found {
  border-top: 3px solid var(--border-strong);
}

.scaling-tier {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--sage-primary);
  margin-bottom: 0.3rem;
}

.scaling-card.level-adv .scaling-tier {
  color: var(--clay-primary);
}

.scaling-card h3 {
  margin-top: 0;
  margin-bottom: 0.55rem;
  font-size: 0.98rem;
}

.scaling-card p {
  font-size: 0.88rem;
  line-height: 1.58;
  margin-bottom: 0;
}

/* Real 50-Minute Studio Block Examples */
.blocks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.1rem;
  margin: 1.15rem 0 1.85rem;
}

.block-example-card {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.block-meta-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}

.block-example-card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-size: 1.32rem;
  font-weight: 600;
}

.block-springs-line {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--sage-primary);
  margin-bottom: 0.7rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border-sand);
}

.block-seq-list {
  margin: 0 0 0.85rem 1.15rem;
  font-size: 0.87rem;
  color: var(--ink-primary);
}

.block-seq-list li {
  margin-bottom: 0.3rem;
}

.block-rationale {
  font-size: 0.8rem;
  color: var(--ink-secondary);
  background: var(--bg-stone-subtle);
  border-radius: var(--radius-sm);
  padding: 0.6rem 0.75rem;
  margin: 0;
  line-height: 1.5;
}

/* Deep-Link CTA Banner */
.cta-banner {
  background: var(--bg-paper);
  border: 1px solid var(--sage-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin: 2.5rem 0;
  box-shadow: var(--shadow-card);
}

.cta-banner h2 {
  margin-top: 0;
  border-bottom: none;
  padding-bottom: 0;
  font-size: 1.65rem;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

/* FAQ */
.faq-item {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.35rem;
  margin-bottom: 0.85rem;
  box-shadow: var(--shadow-card);
}

.faq-item h3 {
  margin-top: 0;
  margin-bottom: 0.4rem;
  font-size: 1rem;
}

.faq-item p {
  margin-bottom: 0;
  font-size: 0.92rem;
}

/* Internal Mesh Links */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.95rem;
  margin: 1rem 0 1.75rem;
}

.related-card {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.05rem 1.2rem;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.related-card:hover {
  border-color: var(--sage-primary);
  transform: translateY(-1px);
}

.related-card-title {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--ink-primary);
  line-height: 1.22;
  margin: 0.2rem 0 0.35rem;
}

.related-card-sub {
  font-size: 0.82rem;
  color: var(--ink-secondary);
}

.prev-next-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-sand);
}

.prev-next-link {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 0.95rem 1.15rem;
  text-decoration: none;
  transition: border-color 0.15s ease;
}

.prev-next-link:hover {
  border-color: var(--sage-primary);
}

.prev-next-link.next {
  text-align: right;
}

.prev-next-dir {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  margin-bottom: 0.2rem;
}

.prev-next-title {
  font-family: var(--font-serif);
  font-size: 1.16rem;
  font-weight: 600;
  color: var(--ink-primary);
}

/* Atlas Hub Directory (/exercises) */
.hub-stats-bar {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.85rem;
  margin: 1.5rem 0;
}

.hub-app-jump {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 0.95rem 1rem;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.hub-app-jump:hover {
  border-color: var(--sage-primary);
  transform: translateY(-1px);
}

.hub-app-count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--clay-primary);
  display: block;
  margin-bottom: 0.15rem;
}

.hub-app-name {
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--ink-primary);
  display: block;
  line-height: 1.2;
}

.hub-filter-panel {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  padding: 1.15rem 1.25rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
}

.hub-search-row {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 0.9rem;
}

.hub-search-input {
  flex: 1;
  min-width: 240px;
  padding: 0.65rem 0.95rem;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-alabaster);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  color: var(--ink-primary);
}

.hub-search-input:focus {
  outline: 2px solid var(--sage-border);
  border-color: var(--sage-primary);
  background: var(--bg-paper);
}

.hub-result-count {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-muted);
}

.hub-filter-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  margin-top: 0.55rem;
}

.hub-filter-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
  min-width: 78px;
}

.filter-btn {
  appearance: none;
  border: 1px solid var(--border-sand);
  background: var(--bg-alabaster);
  color: var(--ink-secondary);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.36rem 0.78rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.14s ease;
}

.filter-btn:hover {
  border-color: var(--sage-primary);
  color: var(--ink-primary);
}

.filter-btn.active {
  background: var(--sage-primary);
  border-color: var(--sage-primary);
  color: #FCFBF8;
}

.hub-section {
  margin-bottom: 3rem;
}

.hub-section-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border-sand);
}

.hub-section-header h2 {
  margin: 0;
  padding: 0;
  border: none;
  font-size: 1.85rem;
}

.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.atlas-hub-card {
  background: var(--bg-paper);
  border: 1px solid var(--border-sand);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.atlas-hub-card:hover {
  border-color: var(--sage-primary);
  transform: translateY(-1px);
}

.atlas-card-plate {
  background: var(--bg-stone-subtle);
  border-bottom: 1px solid var(--border-sand);
  padding: 0.7rem 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--sage-primary);
}

.atlas-card-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.69rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}

.atlas-card-body {
  padding: 1.05rem 1.15rem 1.15rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
}

.atlas-card-title {
  font-family: var(--font-serif);
  font-size: 1.32rem;
  font-weight: 600;
  line-height: 1.2;
  color: var(--ink-primary);
  margin-bottom: 0.35rem;
}

.atlas-card-cat {
  font-size: 0.83rem;
  color: var(--ink-secondary);
  margin-bottom: 0.75rem;
  line-height: 1.45;
}

.atlas-card-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border-sand);
  font-size: 0.78rem;
}

.atlas-card-spring {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--ink-muted);
}

.atlas-card-cta {
  font-weight: 700;
  color: var(--sage-primary);
  white-space: nowrap;
}

/* Footer */
.guide-footer {
  border-top: 1px solid var(--border-sand);
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  font-size: 0.82rem;
  color: var(--ink-muted);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
}

.guide-footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

@media (max-width: 820px) {
  .exercise-hero {
    grid-template-columns: 1fr;
  }
  .hero-plate-box {
    flex-direction: row;
    padding: 0.85rem 1.1rem;
  }
  .hero-plate-caption {
    width: auto;
    padding-top: 0;
    border-top: none;
    text-align: right;
  }
  .spec-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .spec-cell:nth-child(2) {
    border-right: none;
  }
  .spec-cell:nth-child(1),
  .spec-cell:nth-child(2) {
    border-bottom: 1px solid var(--border-sand);
  }
  .biomech-grid,
  .scaling-grid,
  .prev-next-nav {
    grid-template-columns: 1fr;
  }
  .prev-next-link.next {
    text-align: left;
  }
  .hub-stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .guide-header {
    padding: 0.75rem 1rem;
  }
  .exercise-shell,
  .hub-shell {
    padding: 1.75rem 1rem 3rem;
  }
  .spec-strip,
  .hub-stats-bar {
    grid-template-columns: 1fr;
  }
  .spec-cell {
    border-right: none !important;
    border-bottom: 1px solid var(--border-sand);
  }
  .spec-cell:last-child {
    border-bottom: none;
  }
  th, td {
    padding: 0.62rem 0.75rem;
    font-size: 0.84rem;
  }
}