/* ═══════════════════════════════════════════════════════════
   Equities Markets Notes — styles.css
   Modern SaaS Adaptive Theme (Dark Default + Light Mode)
   ═══════════════════════════════════════════════════════════ */

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ── Dark Mode (Default) ── */
:root {
  --bg:           #09090b;
  --surface:      #111113;
  --card:         #18181b;
  --border:       #27272a;
  --border-light: #3f3f46;
  --text:         #fafafa;
  --muted:        #a1a1aa;
  --dim:          #52525b;
  --shadow:       0 1px 3px rgba(0,0,0,0.4);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.5);
  --accent:       #6366f1;
  --accent2:      #818cf8;
  --accent3:      #a5b4fc;
  --green:        #22c55e;
  --amber:        #f59e0b;
  --coral:        #f97316;
  --pink:         #ec4899;
  --teal:         #14b8a6;
  --topbar-height: 40px;
  --sidebar-width: 240px;
  --radius:        6px;
  --radius-md:     8px;
  --radius-lg:     12px;
}

/* ── Light Mode ── */
.light, [data-theme="light"] {
  --bg:           #fafaf9;
  --surface:      #f4f4f5;
  --card:         #ffffff;
  --border:       #e4e4e7;
  --border-light: #d4d4d8;
  --text:         #09090b;
  --muted:        #52525b;
  --dim:          #a1a1aa;
  --shadow:       0 1px 3px rgba(0,0,0,0.06);
  --shadow-md:    0 4px 12px rgba(0,0,0,0.08);
  --green-text:   #15803d;
  --amber-text:   #b45309;
  --coral-text:   #c2410c;
  --teal-text:    #0f766e;
}

/* ── Theme Toggle Icons ── */
.icon-light { display: none; }
.icon-dark  { display: inline; }
.light .icon-dark  { display: none; }
.light .icon-light { display: inline; }

/* ── Topbar ── */
.site-topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.topbar-inner {
  display: flex;
  align-items: center;
  height: 100%;
  padding: 0 16px;
  gap: 12px;
}
.topbar-brand {
  display: flex;
  align-items: center;
  gap: 6px;
  text-decoration: none;
  flex-shrink: 0;
}
.topbar-logo-mark {
  font-size: 11px;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  padding: 2px 5px;
  border-radius: 4px;
  letter-spacing: .05em;
}
.topbar-logo-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
}
.topbar-breadcrumb {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  overflow: hidden;
}
.topbar-bc-link {
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
}
.topbar-bc-link:hover { color: var(--text); }
.topbar-bc-sep { font-size: 12px; color: var(--dim); }
.topbar-bc-current {
  font-size: 12px;
  color: var(--text);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.topbar-theme-toggle {
  background: none;
  border: 1px solid var(--border);
  color: var(--muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius);
  font-size: 13px;
  flex-shrink: 0;
  transition: color .15s, border-color .15s;
}
.topbar-theme-toggle:hover { color: var(--text); border-color: var(--border-light); }
.topbar-request {
  font-size: 11px;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  padding: 4px 10px;
  border-radius: var(--radius);
  flex-shrink: 0;
  transition: opacity .15s;
}
.topbar-request:hover { opacity: .85; }

/* ── App Layout ── */
.app-layout {
  display: flex;
  height: calc(100vh - var(--topbar-height));
  margin-top: var(--topbar-height);
}

/* ── Sidebar ── */
.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  height: calc(100vh - var(--topbar-height));
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.sidebar-label {
  padding: 14px 14px 8px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--dim);
  flex-shrink: 0;
}
#toc-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding-bottom: 8px;
}
#toc-nav::-webkit-scrollbar { width: 3px; }
#toc-nav::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 2px; }
#toc-nav::-webkit-scrollbar-track { background: transparent; }

/* TOC items */
.toc-item { border-bottom: 1px solid var(--border); }
a.toc-header {
  display: flex;
  align-items: center;
  padding: 9px 12px;
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  cursor: pointer;
  transition: color .15s, background .15s;
  gap: 8px;
}
a.toc-header:hover { color: var(--text); background: rgba(255,255,255,.03); }
.light a.toc-header:hover { background: rgba(0,0,0,.03); }
a.toc-header.active { color: var(--accent2); }
.toc-icon { font-size: 14px; flex-shrink: 0; }
.toc-label { flex: 1; }
.toc-chevron {
  font-size: 9px;
  color: var(--dim);
  transition: transform .2s ease;
  flex-shrink: 0;
}
.toc-item.open > a.toc-header .toc-chevron { transform: rotate(90deg); }
.toc-subs { display: none; padding: 2px 0 6px 28px; }
.toc-item.open .toc-subs { display: block; }
a.toc-sub {
  display: block;
  padding: 5px 12px 5px 0;
  font-size: 12px;
  color: var(--dim);
  text-decoration: none;
  transition: color .15s;
  line-height: 1.4;
}
a.toc-sub:hover { color: var(--muted); }
a.toc-sub.active { color: var(--accent2); font-weight: 500; }

/* Progress Bar */
.sidebar-footer {
  padding: 10px 14px;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.progress-meta {
  display: flex;
  justify-content: space-between;
  font-size: 11px;
  color: var(--dim);
  margin-bottom: 5px;
}
.progress-bar {
  height: 2px;
  background: var(--border);
  border-radius: 2px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 2px;
  width: 0%;
  transition: width .4s ease;
}

/* ── Main Content ── */
.main-content {
  flex: 1;
  overflow-y: auto;
  height: calc(100vh - var(--topbar-height));
  padding: 32px 48px 64px;
}
.main-header {
  padding: 0;
  max-width: 860px;
  margin: 0 auto;
}
.breadcrumb {
  font-size: 12px;
  color: var(--dim);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 4px;
}
.breadcrumb .bc-active { color: var(--muted); }
#content-area { max-width: 860px; margin: 0 auto; }

/* ── Content Container ── */
.content-container { padding-top: 8px; padding-bottom: 48px; }
.topic-hero { margin-bottom: 28px; }
.topic-hero h1, .topic-hero h2 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
  margin-bottom: 10px;
}
.difficulty-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 16px;
  letter-spacing: .03em;
}
.difficulty-badge.beginner      { background: rgba(34,197,94,.12);  color: var(--green); }
.difficulty-badge.intermediate  { background: rgba(245,158,11,.12); color: var(--amber); }
.difficulty-badge.advanced      { background: rgba(249,115,22,.12); color: var(--coral); }
.difficulty-badge.expert        { background: rgba(239,68,68,.14);  color: #f87171; }
.light .difficulty-badge.beginner    { color: var(--green-text,  #15803d); }
.light .difficulty-badge.intermediate{ color: var(--amber-text,  #b45309); }
.light .difficulty-badge.advanced    { color: var(--coral-text,  #c2410c); }

/* ── Typography ── */
.section-title {
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  margin: 32px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.subsection-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 24px 0 10px;
}
.body-text {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 14px;
}
.lead-text {
  font-size: 16px;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 20px;
}
strong { color: var(--text); font-weight: 600; }
em { color: var(--muted); font-style: italic; }

/* ── Stat Cards ── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin: 20px 0 28px;
}
.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px;
  border-top-width: 3px;
}
.stat-card .stat-value {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 4px;
}
.stat-card .stat-label {
  font-size: 11px;
  color: var(--dim);
  line-height: 1.4;
}

/* ── Tables ── */
.table-wrap { overflow-x: auto; margin: 16px 0 24px; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
th {
  background: var(--surface);
  color: var(--muted);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
td {
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  vertical-align: top;
}
tr:hover td { background: rgba(255,255,255,.02); }
.light tr:hover td { background: rgba(0,0,0,.02); }
td strong { color: var(--text); }

/* ── Callout Boxes ── */
.callout {
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin: 18px 0;
  font-size: 13.5px;
  line-height: 1.6;
  border-left: 3px solid;
}
.callout-title { font-weight: 700; margin-bottom: 4px; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; }
.callout.info    { background: rgba(99,102,241,.08);  border-color: var(--accent);  color: var(--muted); }
.callout.success { background: rgba(34,197,94,.08);   border-color: var(--green);   color: var(--muted); }
.callout.warning { background: rgba(245,158,11,.08);  border-color: var(--amber);   color: var(--muted); }
.callout.danger  { background: rgba(249,115,22,.08);  border-color: var(--coral);   color: var(--muted); }
.callout.teal    { background: rgba(20,184,166,.08);  border-color: var(--teal);    color: var(--muted); }
.callout.info .callout-title    { color: var(--accent2); }
.callout.success .callout-title { color: var(--green); }
.callout.warning .callout-title { color: var(--amber); }
.callout.danger .callout-title  { color: var(--coral); }
.callout.teal .callout-title    { color: var(--teal); }

/* ── Formula Box ── */
.formula-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  margin: 16px 0;
  font-family: 'Courier New', monospace;
  font-size: 13px;
  color: var(--accent3);
  line-height: 1.7;
}
.formula-box .formula-label {
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--dim);
  margin-bottom: 6px;
}

/* ── Step List ── */
.step-list { list-style: none; margin: 12px 0 20px; padding: 0; }
.step-list li {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}
.step-num {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

/* ── Bullet Lists ── */
.bullet-list { list-style: none; padding: 0; margin: 10px 0 18px; }
.bullet-list li {
  padding: 4px 0 4px 18px;
  position: relative;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}
.bullet-list li::before {
  content: '•';
  position: absolute;
  left: 4px;
  color: var(--accent);
  font-size: 12px;
}

/* ── Country Tabs ── */
.country-tabs { margin: 20px 0; }
.country-tab-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-bottom: 0;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.country-tab-btn {
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--dim);
  cursor: pointer;
  transition: color .15s;
  margin-bottom: -1px;
}
.country-tab-btn:hover { color: var(--muted); }
.light .country-tab-btn:hover { color: var(--text); }
.country-tab-btn.active { color: var(--accent2); border-bottom-color: var(--accent); }
.country-tab-panel { display: none; padding: 16px 0 4px; font-size: 13px; color: var(--muted); line-height: 1.65; }
.country-tab-panel.active { display: block; }
.country-tab-panel ul { margin: 8px 0; padding-left: 18px; }
.country-tab-panel li { margin-bottom: 5px; }

/* ── Expandable (Accordion) ── */
.expandable { border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 8px; overflow: hidden; }
.expandable-header {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--surface);
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}
.expandable-header:hover { background: rgba(255,255,255,.03); }
.light .expandable-header:hover { background: rgba(0,0,0,.03); }
.expandable-chevron { font-size: 10px; color: var(--dim); transition: transform .2s; }
.expandable.open .expandable-chevron { transform: rotate(180deg); }
.expandable-body { display: none; padding: 14px 16px; border-top: 1px solid var(--border); font-size: 13.5px; color: var(--muted); line-height: 1.65; }
.expandable.open .expandable-body { display: block; }

/* ── Quiz MCQ ── */
.quiz-question { margin-bottom: 24px; }
.quiz-q { font-size: 14px; font-weight: 500; color: var(--text); margin-bottom: 10px; line-height: 1.5; }
.quiz-options { display: flex; flex-direction: column; gap: 6px; }
.quiz-opt {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.quiz-opt:hover { border-color: var(--accent); color: var(--text); }
.quiz-question.answered .quiz-opt { cursor: not-allowed; }
.quiz-opt.correct { border-color: var(--green); background: rgba(34,197,94,.08); color: var(--green); }
.quiz-opt.wrong   { border-color: var(--coral); background: rgba(249,115,22,.08); color: var(--coral); }
.quiz-explain {
  display: none;
  margin-top: 10px;
  padding: 10px 12px;
  background: var(--card);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--muted);
  line-height: 1.6;
  border-left: 3px solid var(--green);
}
.quiz-question.answered .quiz-explain { display: block; }

/* ── Knowledge Check ── */
.kc-item { border: 1px solid var(--border); border-radius: var(--radius-md); margin-bottom: 10px; overflow: hidden; }
.kc-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  padding: 12px 16px;
  background: var(--surface);
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 12px;
}
.kc-question:hover { background: rgba(99,102,241,.05); }
.light .kc-question:hover { background: rgba(99,102,241,.04); }
.kc-q-text { font-size: 14px; color: var(--text); font-weight: 500; line-height: 1.5; }
.kc-toggle { font-size: 11px; color: var(--muted); flex-shrink: 0; margin-top: 3px; transition: transform .2s ease; }
.kc-item.open .kc-toggle { transform: rotate(180deg); }
.kc-answer {
  display: none;
  padding: 14px 16px;
  border-top: 1px solid var(--border);
  background: var(--bg);
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}
.kc-item.open .kc-answer { display: block; }

/* ── Mini Quiz & Topic Quick Check ── */
.mini-quiz-section { margin-top: 40px; padding-top: 32px; border-top: 1px solid var(--border); }
.mini-quiz-section h3 { margin-bottom: 4px; font-size: 18px; color: var(--text); }
.mini-quiz-block { margin-bottom: 32px; }
.mini-quiz-block h4, .knowledge-check-block h4 {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--muted);
  margin-bottom: 16px;
}
.topic-quick-check { margin-top: 40px; padding-top: 32px; border-top: 1px solid var(--border); }
.topic-quick-check h3 { margin-bottom: 4px; font-size: 18px; color: var(--text); }
.knowledge-check-block { margin-top: 8px; }

/* ── Cheatsheet ── */
.cheatsheet-section { margin-bottom: 32px; }
.cheatsheet-section h3 {
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--dim);
  margin-bottom: 14px;
}

/* ── Subtopic Navigation ── */
.subtopic-nav {
  margin-top: 36px;
  padding: 14px 0 10px;
  border-top: 1px solid var(--border);
}
.subtopic-nav-label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--dim);
  margin-bottom: 8px;
}
.subtopic-nav-links { display: flex; flex-wrap: wrap; gap: 6px; }
.subtopic-nav-link {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 12px;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  text-decoration: none;
  transition: color .15s, border-color .15s;
  cursor: pointer;
}
.subtopic-nav-link:hover { color: var(--text); border-color: var(--accent); }
.subtopic-nav-link.active {
  color: var(--accent);
  border-color: var(--accent);
  background: rgba(99,102,241,.07);
  font-weight: 500;
  pointer-events: none;
}
.topic-nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 8px;
}
.topic-nav-prev, .topic-nav-next {
  font-size: 13px;
  color: var(--accent2);
  text-decoration: none;
  transition: color .15s;
}
.topic-nav-prev:hover, .topic-nav-next:hover { color: var(--accent); }
.topic-nav-next { margin-left: auto; }

/* ── Misc ── */
.tag-row { display: flex; flex-wrap: wrap; gap: 6px; margin: 10px 0; }
.tag {
  padding: 3px 9px;
  border-radius: 20px;
  font-size: 11px;
  font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--dim);
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .sidebar { display: none; }
  .main-content { padding: 20px 20px 48px; }
  .stat-grid { grid-template-columns: 1fr 1fr; }
}