/* ── Production-grade theme ── */
:root {
  --md-text-font-size: 16px;
  --md-code-font-size: 13.5px;

  --brand:        #5b6af5;
  --brand-dark:   #4451e0;
  --brand-light:  #eef0fe;

  --green:        #00b37e;
  --green-light:  #e6f9f3;
  --green-dark:   #00956a;
}

/* ── Light mode ── */
[data-md-color-scheme="default"] {
  --md-primary-fg-color:        #5b6af5;
  --md-primary-bg-color:        #ffffff;
  --md-accent-fg-color:         #5b6af5;
  --md-typeset-a-color:         #5b6af5;
  --md-default-bg-color:        #f9f9fb;
  --md-default-fg-color:        #111827;
  --md-default-fg-color--light: #374151;
  --md-default-fg-color--lighter: #6b7280;
}

/* Header */
[data-md-color-scheme="default"] .md-header {
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
  box-shadow: 0 1px 6px rgba(0,0,0,0.06);
  color: #111827;
  padding: 0.4rem 0.4rem 0 0.4rem;
  margin-top: 4px;
}

[data-md-color-scheme="default"] .md-header__title {
  color: #111827;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.3px;
}

/* Tabs bar */
[data-md-color-scheme="default"] .md-tabs {
  background-color: #ffffff;
  border-bottom: 1px solid #e5e7eb;
}

[data-md-color-scheme="default"] .md-tabs__link {
  color: #6b7280;
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.01em;
  padding: 0 0.8rem;
  transition: color 0.15s ease;
}

[data-md-color-scheme="default"] .md-tabs__link:hover {
  color: #111827;
}

[data-md-color-scheme="default"] .md-tabs__link--active {
  color: var(--green) !important;
  font-weight: 700;
  border-bottom: 2px solid var(--green);
}

/* Search bar — ShadCN style */
[data-md-color-scheme="default"] .md-search__form {
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  display: flex;
  align-items: center;
}

[data-md-color-scheme="default"] .md-search__form:hover {
  border-color: #cbd5e1;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

[data-md-color-scheme="default"] .md-search__input {
  background-color: transparent;
  border: none;
  border-radius: 8px;
  color: #111827;
  font-size: 0.875rem;
  box-shadow: none !important;
}

[data-md-color-scheme="default"] .md-search__input::placeholder {
  color: #94a3b8;
  font-size: 0.875rem;
}

[data-md-color-scheme="default"] .md-search__input:focus {
  border: none;
  box-shadow: none;
  background-color: transparent;
}

[data-md-color-scheme="default"] .md-search__form:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(0,179,126,0.12);
}

[data-md-color-scheme="default"] .md-search__icon {
  color: #94a3b8;
}

/* Sidebar */
[data-md-color-scheme="default"] .md-sidebar {
  background-color: #ffffff;
  border-right: 1px solid #f0f0f0;
}

[data-md-color-scheme="default"] .md-nav__link {
  color: #374151;
}

[data-md-color-scheme="default"] .md-nav__link:hover,
[data-md-color-scheme="default"] .md-nav__link--active {
  color: #5b6af5;
}

/* Content area */
[data-md-color-scheme="default"] .md-content {
  background-color: #ffffff;
}

/* ── Typography ── */
.md-typeset {
  font-size: 1rem;
  line-height: 1.85;
  color: #111827;
}

.md-typeset h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #111827;
  margin-bottom: 0.5rem;
}

.md-typeset h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.3px;
  margin-top: 2.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #e5e7eb;
}

.md-typeset h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 1.8rem;
  color: #1f2937;
}

.md-typeset a {
  font-weight: 500;
}

.md-typeset code {
  font-size: 0.87rem;
  border-radius: 5px;
  padding: 0.1em 0.4em;
  background-color: var(--green-light);
  color: var(--green-dark);
  border: 1px solid #b2e8d8;
}

.md-typeset pre code {
  background-color: transparent;
  color: inherit;
  border: none;
  padding: 0;
}

.md-typeset pre {
  border-radius: 10px;
  border: 1px solid #e5e7eb;
}

.md-typeset blockquote {
  border-left: 3px solid var(--green);
  background: var(--green-light);
  border-radius: 0 8px 8px 0;
  padding: 0.8rem 1rem;
  color: #374151;
}

/* Nav font size */
.md-nav__item .md-nav__link {
  font-size: 0.84rem;
}

/* ── Green touches ── */

/* Active nav item in sidebar */
[data-md-color-scheme="default"] .md-nav__link--active {
  color: var(--green) !important;
  font-weight: 600;
  background-color: var(--green-light);
  border-radius: 6px;
  padding-left: 0.6rem;
  border-left: 3px solid var(--green);
}

/* h2 bottom border — green */
.md-typeset h2 {
  border-bottom-color: var(--green) !important;
}

/* Tip admonition — green */
.md-typeset .admonition.tip,
.md-typeset details.tip {
  border-color: var(--green);
}
.md-typeset .admonition.tip > .admonition-title,
.md-typeset details.tip > summary {
  background-color: var(--green-light);
  color: var(--green-dark);
}
.md-typeset .admonition.tip > .admonition-title::before,
.md-typeset details.tip > summary::before {
  background-color: var(--green);
}

/* Success callout — green */
.md-typeset .admonition.success,
.md-typeset details.success {
  border-color: var(--green);
}
.md-typeset .admonition.success > .admonition-title,
.md-typeset details.success > summary {
  background-color: var(--green-light);
  color: var(--green-dark);
}

/* Home page cards */
.md-typeset .grid.cards > ul > li,
.md-typeset .grid.cards > :not(ul) {
  border-radius: 14px;
  padding: 2rem;
  border: 1px solid #e5e7eb;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
  transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
  background: #ffffff;
}

.md-typeset .grid.cards > ul > li:hover,
.md-typeset .grid.cards > :not(ul):hover {
  box-shadow: 0 8px 28px rgba(0,179,126,0.12);
  transform: translateY(-3px);
  border-color: var(--green);
}

/* Wider content */
.md-grid {
  max-width: 1260px;
}

/* TOC */
[data-md-color-scheme="default"] .md-nav--secondary .md-nav__link--active {
  color: #5b6af5;
  font-weight: 600;
}

/* ── Case Study Home Page ── */

.cs-hero {
  text-align: center;
  padding: 3.5rem 1rem 2.5rem;
  margin-bottom: 0.5rem;
}

.cs-hero-label {
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--green);
  margin-bottom: 0.8rem;
}

.cs-hero-title {
  font-size: 2.6rem !important;
  font-weight: 800 !important;
  line-height: 1.2 !important;
  letter-spacing: -0.5px !important;
  color: #111827 !important;
  margin-bottom: 1rem !important;
}

.cs-hero-sub {
  font-size: 1.05rem;
  color: #6b7280;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

.cs-path-label {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: #9ca3af;
  margin-bottom: 1.2rem;
  padding-left: 2px;
}

/* Level block */
.cs-level {
  margin-bottom: 1.2rem;
  border: 1px solid #e5e7eb;
  border-radius: 16px;
  overflow: hidden;
  background: #ffffff;
}

.cs-level.locked {
  background: #fafafa;
  opacity: 0.6;
}

.cs-level-header {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  padding: 1.2rem 1.5rem;
  border-bottom: 1px solid #f0f0f0;
}

.cs-level.locked .cs-level-header {
  border-bottom: none;
}

.cs-level-badge {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.65rem;
  border-radius: 8px;
  white-space: nowrap;
  flex-shrink: 0;
}

.cs-level-badge.lv1 { background: #dcfce7; color: #15803d; }
.cs-level-badge.lv2 { background: #dbeafe; color: #1d4ed8; }
.cs-level-badge.lv3 { background: #fef9c3; color: #a16207; }
.cs-level-badge.lv4 { background: #ffedd5; color: #c2410c; }
.cs-level-badge.lv5 { background: #fee2e2; color: #b91c1c; }

.cs-level-meta {
  flex: 1;
}

.cs-level-title {
  font-size: 1rem;
  font-weight: 700;
  color: #111827;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cs-level-desc {
  font-size: 0.82rem;
  color: #6b7280;
  margin-top: 0.15rem;
}

.cs-level-count {
  font-size: 0.78rem;
  font-weight: 600;
  color: #6b7280;
  white-space: nowrap;
  flex-shrink: 0;
}

.cs-locked-count {
  color: #d1d5db;
}

.cs-soon {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: #9ca3af;
  background: #f3f4f6;
  padding: 0.2rem 0.5rem;
  border-radius: 20px;
  vertical-align: middle;
}

/* Cards row */
.cs-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1.2rem 1.5rem;
}

/* Individual card */
.cs-card {
  display: block;
  text-decoration: none !important;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 1.3rem 1.4rem;
  background: #ffffff;
  transition: box-shadow 0.18s ease, transform 0.18s ease, border-color 0.18s ease;
  color: inherit !important;
}

.cs-card:hover {
  box-shadow: 0 6px 24px rgba(0,179,126,0.13);
  transform: translateY(-2px);
  border-color: var(--green);
  text-decoration: none !important;
}

.cs-card-elite {
  border-color: #fecaca;
  background: linear-gradient(135deg, #ffffff 0%, #fff5f5 100%);
}

.cs-card-elite:hover {
  box-shadow: 0 6px 24px rgba(185,28,28,0.12);
  border-color: #f87171;
}

.cs-card-header {
  margin-bottom: 0.7rem;
}

.cs-badge {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.55rem;
  border-radius: 20px;
}

.cs-badge.foundation  { background: #dcfce7; color: #15803d; }
.cs-badge.ascent      { background: #dbeafe; color: #1d4ed8; }
.cs-badge.expedition  { background: #fef9c3; color: #a16207; }
.cs-badge.summit      { background: #ffedd5; color: #c2410c; }
.cs-badge.battleground{ background: #fee2e2; color: #b91c1c; }

.cs-card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: #111827;
  margin-bottom: 0.35rem;
}

.cs-card-desc {
  font-size: 0.84rem;
  color: #6b7280;
  line-height: 1.55;
  margin-bottom: 1rem;
}

.cs-topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.cs-topics span {
  font-size: 0.7rem;
  font-weight: 500;
  color: #374151;
  background: #f3f4f6;
  border: 1px solid #e5e7eb;
  padding: 0.18rem 0.55rem;
  border-radius: 20px;
}