/* ========================================
   1. CSS Variables & Reset
   ======================================== */
:root {
  --color-primary: #0F172A;
  --color-primary-light: #1E293B;
  --color-accent: #F59E0B;
  --color-accent-hover: #D97706;
  --color-emerald: #10B981;
  --color-emerald-light: #ECFDF5;
  --color-rose: #F43F5E;
  --color-rose-light: #FFF1F2;
  --color-bg: #F8FAFC;
  --color-surface: #FFFFFF;
  --color-text: #334155;
  --color-text-secondary: #94A3B8;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  --font-display: 'Inter', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: Georgia, 'Times New Roman', serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', monospace;
  --h1-size: clamp(2rem, 5vw, 3.5rem);
  --h2-size: clamp(1.5rem, 3.5vw, 2.25rem);
  --h3-size: clamp(1.15rem, 2.5vw, 1.5rem);
  --body-size: clamp(0.95rem, 1.5vw, 1.1rem);
  --caption-size: 0.8rem;
  --content-max-width: 800px;
  --section-gap: clamp(3rem, 6vw, 5rem);
  --sidebar-width: 240px;
  --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);

    /* --- AUTO-FORCED DARK THEME --- */
    --color-primary: #E2E8F0;
    --color-primary-light: #CBD5E1;
    --color-bg: #0F172A;
    --color-surface: #1E293B;
    --color-text: #E2E8F0;
    --color-text-secondary: #94A3B8;
    --color-border: #334155;
    --color-border-light: #1E293B;
}



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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-body);
  font-size: var(--body-size);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-base);
}

a:hover {
  color: var(--color-accent-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ========================================
   2. General Typography
   ======================================== */
h1 {
  font-family: var(--font-display);
  font-size: var(--h1-size);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h2 {
  font-family: var(--font-display);
  font-size: var(--h2-size);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
  text-align: left;
  margin-bottom: 1.25rem;
  scroll-margin-top: 2rem;
}

h3 {
  font-family: var(--font-display);
  font-size: var(--h3-size);
  font-weight: 600;
  line-height: 1.3;
  text-align: left;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  scroll-margin-top: 2rem;
}

p {
  text-align: justify;
  margin-bottom: 1.25rem;
}

ul, ol {
  text-align: justify;
  padding-left: 1.5rem;
  margin-bottom: 1.25rem;
}

li {
  margin-bottom: 0.5rem;
}

blockquote {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-style: italic;
  font-weight: 400;
  text-align: left;
  border-left: 3px solid var(--color-accent);
  padding: 0.75rem 1.25rem;
  margin: 1.5rem 0;
  color: var(--color-text-secondary);
}

strong {
  font-weight: 600;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

thead th {
  background-color: var(--color-surface);
  border-bottom: 2px solid var(--color-border);
  padding: 0.75rem 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-secondary);
}

tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border-light);
  text-align: left;
}

tbody tr:hover {
  background-color: var(--color-border-light);
}

figure {
  margin: 2rem auto;
  max-width: 100%;
}

figcaption {
  text-align: center;
  font-size: var(--caption-size);
  color: var(--color-text-secondary);
  margin-top: 0.5rem;
}

/* ========================================
   3. Layout — Main Grid (Sidebar TOC)
   ======================================== */
header {
  position: relative;
  z-index: 10;
}

main {
  width: 100%;
  max-width: 1360px;
  margin-left: auto;
  margin-right: auto;
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: 0 2.5rem;
}

main > [data-content="hero"] {
  grid-column: 1 / -1;
}

main > [data-content="toc"] {
  grid-column: 1;
  grid-row: 2 / 100;
}

main > [data-content]:not([data-content="hero"]):not([data-content="toc"]) {
  grid-column: 2;
  text-align: justify;
}

/* ========================================
   4. Section Blocks (data-content)
   ======================================== */
[data-content] {
    max-width: var(--content-max-width);
    padding: 0 1.5rem;
    margin-bottom: var(--section-gap);
    margin-left: auto;  
    margin-right: auto;
}

[data-content="hero"] {
  max-width: none;
  padding: 0;
  margin-bottom: 0;
}

[data-content="toc"] {
  max-width: var(--sidebar-width);
  padding: 0;
}

/* ========================================
   5. Components
   ======================================== */

/* --- info-box --- */
.info-box {
  background: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 6px 6px 0;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.info-box p {
  text-align: left;
  margin-bottom: 0.5rem;
  color: var(--color-text);
}
.info-box p:last-child { margin-bottom: 0; }
.info-box strong {
  color: var(--color-primary);
}
@media (prefers-color-scheme: dark) {
  .info-box {
    background: var(--color-surface);
    border-left-color: var(--color-accent);
  }
  .info-box strong {
    color: var(--color-primary);
  }
}

/* --- calc-example --- */
.calc-example {
  background: #0F172A;
  color: #F8FAFC;
  border-radius: 8px;
  padding: 1.75rem 1.5rem;
  margin: 2rem 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.calc-example p {
  text-align: center;
  color: #F8FAFC;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
}
.calc-example p:last-child { margin-bottom: 0; }
.calc-example strong {
  color: var(--color-accent);
}
@media (prefers-color-scheme: dark) {
  .calc-example {
    background: #0F172A;
    color: #F8FAFC;
  }
  .calc-example p { color: #F8FAFC; }
}

/* --- callout (warning + tip) --- */
.callout {
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin: 2rem 0;
  border-left: 4px solid var(--color-rose);
  background: var(--color-rose-light);
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.callout p {
  text-align: left;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}
.callout p:last-child { margin-bottom: 0; }
.callout.callout-tip {
  border-left-color: var(--color-emerald);
  background: var(--color-emerald-light);
}
@media (prefers-color-scheme: dark) {
  .callout {
    background: #2D1B1E;
    border-left-color: var(--color-rose);
  }
  .callout p { color: #F8FAFC; }
  .callout.callout-tip {
    background: #1B2D25;
    border-left-color: var(--color-emerald);
  }
  .callout.callout-tip p { color: #F8FAFC; }
}

/* --- card-grid --- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  margin: 2rem 0;
}
.card-grid > div {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.card-grid > div:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.card-grid p {
  text-align: left;
  color: var(--color-text);
  margin-bottom: 0.5rem;
  font-size: 0.92rem;
}
.card-grid strong {
  font-size: 1.4rem;
  font-family: var(--font-display);
  color: var(--color-primary);
  display: block;
  margin-bottom: 0.25rem;
}
@media (prefers-color-scheme: dark) {
  .card-grid > div {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
  .card-grid p { color: var(--color-text); }
  .card-grid strong { color: var(--color-primary); }
}

/* --- comparison --- */
.comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}
.comparison > div {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.comparison > div h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color-accent);
}
.comparison p {
  text-align: left;
  color: var(--color-text);
  font-size: 0.92rem;
  margin-bottom: 0.5rem;
}
@media (max-width: 600px) {
  .comparison { grid-template-columns: 1fr; }
}
@media (prefers-color-scheme: dark) {
  .comparison > div {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
  .comparison p { color: var(--color-text); }
}

/* --- tldr --- */
.tldr {
  background: var(--color-surface);
  border-left: 4px solid var(--color-accent);
  border-radius: 0 6px 6px 0;
  padding: 1.5rem 1.75rem;
  margin-bottom: var(--section-gap);
}
.tldr h2 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.25rem);
  font-weight: 700;
  margin-bottom: 1rem;
}
.tldr ul {
  padding-left: 1.25rem;
}
.tldr li {
  margin-bottom: 0.6rem;
  font-size: 0.95rem;
}
@media (prefers-color-scheme: dark) {
  .tldr {
    background: var(--color-surface);
  }
}

/* --- key-takeaway --- */
.key-takeaway {
  border-top: 2px solid var(--color-accent);
  padding-top: 1.25rem;
  margin: 2.5rem 0;
}
.key-takeaway p {
  text-align: left;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.5vw, 1.35rem);
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-text);
}

/* --- fun-fact --- */
.fun-fact {
  position: relative;
  padding-left: 1.5rem;
  margin: 1.5rem 0;
}
.fun-fact::before {
  content: '\2014';
  position: absolute;
  left: 0;
  top: 0;
  color: var(--color-accent);
  font-weight: 700;
}
.fun-fact p {
  text-align: left;
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}

/* --- glossary-term --- */
.glossary-term {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 1rem 0;
}
.glossary-term strong {
  font-family: var(--font-mono);
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
  white-space: nowrap;
}
.glossary-term span {
  font-family: var(--font-body);
  color: var(--color-text-secondary);
}
@media (max-width: 600px) {
  .glossary-term { flex-direction: column; gap: 2px; }
}

/* --- dos-donts --- */
.dos-donts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}
.dos-donts > div {
  padding: 1.25rem;
  border-radius: 8px;
}
.dos-donts > div:first-child {
  background: var(--color-emerald-light);
  border-top: 3px solid var(--color-emerald);
}
.dos-donts > div:last-child {
  background: var(--color-rose-light);
  border-top: 3px solid var(--color-rose);
}
.dos-donts h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.75rem;
}
.dos-donts > div:first-child h4 { color: #047857; }
.dos-donts > div:last-child h4 { color: #BE123C; }
.dos-donts p, .dos-donts li {
  text-align: left;
  color: var(--color-text);
  font-size: 0.92rem;
}
@media (max-width: 600px) {
  .dos-donts { grid-template-columns: 1fr; }
}
@media (prefers-color-scheme: dark) {
  .dos-donts > div:first-child {
    background: #0D2818;
    border-top-color: var(--color-emerald);
  }
  .dos-donts > div:first-child h4 { color: #6EE7B7; }
  .dos-donts > div:last-child {
    background: #2D1219;
    border-top-color: var(--color-rose);
  }
  .dos-donts > div:last-child h4 { color: #FDA4AF; }
  .dos-donts p, .dos-donts li { color: #E2E8F0; }
}

/* --- pre-game-checklist --- */
.pre-game-checklist {
  margin: 2rem 0;
}
.pre-game-checklist h4 {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.8rem;
  color: var(--color-accent);
  margin-bottom: 1rem;
}
.pre-game-checklist ul {
  list-style: none;
  padding-left: 1.5rem;
  border-left: 2px solid var(--color-border);
}
.pre-game-checklist li {
  position: relative;
  padding-left: 0.5rem;
  margin-bottom: 0.75rem;
  text-align: left;
  color: var(--color-text);
}
.pre-game-checklist li::before {
  content: '\2610';
  position: absolute;
  left: -1.25rem;
  color: var(--color-accent);
  background: var(--color-bg);
  padding: 0 2px;
}
@media (prefers-color-scheme: dark) {
  .pre-game-checklist li::before { background: var(--color-bg); }
}

/* --- at-a-glance --- */
.at-a-glance {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  margin: 2rem 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
}
.at-a-glance > div {
  padding: 1.25rem;
  text-align: center;
  border-right: 1px solid var(--color-border);
}
.at-a-glance > div:last-child { border-right: none; }
.at-a-glance strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}
.at-a-glance p {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin-bottom: 0;
}
@media (max-width: 600px) {
  .at-a-glance {
    grid-template-columns: 1fr;
  }
  .at-a-glance > div {
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .at-a-glance > div:last-child { border-bottom: none; }
}

/* --- worked-example --- */
.worked-example {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.75rem 1.5rem;
  margin: 2rem 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.worked-example p {
  text-align: left;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--color-text);
  margin-bottom: 0.75rem;
}
.worked-example hr {
  border: none;
  border-top: 1px dashed var(--color-border);
  margin: 1rem 0;
}
.worked-example .result {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
}
@media (prefers-color-scheme: dark) {
  .worked-example {
    background: var(--color-surface);
    border-color: var(--color-border);
  }
  .worked-example p { color: var(--color-text); }
}

/* --- section-bridge --- */
.section-bridge {
  text-align: center;
  margin: 2rem 0;
  position: relative;
  padding: 0 2rem;
}
.section-bridge::before,
.section-bridge::after {
  content: '\2014\2014';
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-secondary);
  opacity: 0.4;
}
.section-bridge::before { left: 0; }
.section-bridge::after { right: 0; }
.section-bridge p {
  text-align: center;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--color-accent);
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* ========================================
   6. Hero Section
   ======================================== */
[data-content="hero"] {
  width: 100vw;
  margin-left: calc(50% - 50vw);
  position: relative;
  overflow: hidden;
  background: linear-gradient(165deg, #0F172A 0%, #1E293B 60%, #0F172A 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

[data-content="hero"]::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Ccircle cx='40' cy='40' r='16' fill='none' stroke='%23F59E0B' stroke-width='0.5' opacity='0.06'/%3E%3Ccircle cx='40' cy='40' r='8' fill='none' stroke='%23F59E0B' stroke-width='0.3' opacity='0.04'/%3E%3Cline x1='32' y1='40' x2='48' y2='40' stroke='%23F59E0B' stroke-width='0.3' opacity='0.04'/%3E%3C/svg%3E");
  background-size: 80px 80px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 50%, black 20%, transparent 70%);
}

[data-content="hero"]::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 40%, rgba(245,158,11,0.05) 0%, transparent 70%);
  pointer-events: none;
}

[data-content="hero"] .hero-inner {
  position: relative;
  z-index: 2;
  max-width: 800px;
  width: 100%;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

[data-content="hero"] h1 {
  color: #FFFFFF;
  margin-bottom: 1rem;
}

[data-content="hero"] p,
[data-content="hero"] figcaption {
  text-align: center;
}

[data-content="hero"] .hero-subtitle-hook {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

[data-content="hero"] .hero-description {
  color: #CBD5E1;
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  line-height: 1.7;
  max-width: 640px;
  margin: 0 auto 2rem;
}

[data-content="hero"] .hero-badges {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
  width: 100%;
}

[data-content="hero"] .hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(255,255,255,0.07);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 100px;
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: #E2E8F0;
  letter-spacing: 0.02em;
}

[data-content="hero"] .hero-badge .badge-num {
  color: var(--color-accent);
  font-weight: 800;
}

[data-content="hero"] figure {
  margin: 2rem auto 0;
  max-width: 720px;
}

[data-content="hero"] .hero-image {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  border-radius: 8px;
}

[data-content="hero"] figcaption {
  color: #94A3B8;
  margin-top: 0.75rem;
}

[data-content="hero"] .hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-accent);
  color: #0F172A;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.7rem 1.5rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background var(--transition-base), transform var(--transition-base);
  text-decoration: none;
}

[data-content="hero"] .hero-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* ========================================
   7. TOC — Sticky Sidebar
   ======================================== */
[data-content="toc"] {
  position: sticky;
  top: 2rem;
  max-height: calc(100vh - 4rem);
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
  padding-right: 1rem;
  margin-top: 0.5rem;
}

[data-content="toc"]::-webkit-scrollbar {
  width: 4px;
}

[data-content="toc"]::-webkit-scrollbar-track {
  background: transparent;
}

[data-content="toc"]::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: 2px;
}

[data-content="toc"] nav {
  font-size: 0.82rem;
}

[data-content="toc"] .toc-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

[data-content="toc"] ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 0;
}

[data-content="toc"] li {
  margin-bottom: 0.15rem;
}

[data-content="toc"] > nav > ul > li > a {
  display: block;
  padding: 0.35rem 0.5rem;
  color: var(--color-text);
  font-weight: 600;
  border-radius: 4px;
  transition: background var(--transition-base), color var(--transition-base);
}

[data-content="toc"] > nav > ul > li > a:hover {
  background: var(--color-border-light);
  color: var(--color-accent);
}

[data-content="toc"] ul ul {
  padding-left: 0.75rem;
  margin-top: 0.15rem;
}

[data-content="toc"] ul ul a {
  display: block;
  padding: 0.25rem 0.5rem;
  color: var(--color-text-secondary);
  font-weight: 400;
  font-size: 0.78rem;
  border-radius: 4px;
  transition: color var(--transition-base), background var(--transition-base);
}

[data-content="toc"] ul ul a:hover {
  color: var(--color-accent);
  background: var(--color-border-light);
}

/* ========================================
   8. FAQ Accordion
   ======================================== */
details {
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 0;
}

summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
  padding: 1rem 0;
  font-weight: 600;
  font-size: 1rem;
  list-style: none;
  color: var(--color-text);
  transition: color var(--transition-base);
}

summary::-webkit-details-marker { display: none; }
summary::marker { display: none; content: ''; }

summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  transition: transform var(--transition-base);
  flex-shrink: 0;
  margin-left: 1rem;
}

details[open] summary::after {
  transform: rotate(45deg);
}

summary:hover { color: var(--color-accent); }

summary:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

details {
  interpolate-size: allow-keywords;
}

::details-content {
  block-size: 0;
  opacity: 0;
  overflow: hidden;
  content-visibility: hidden;
  transition:
    block-size 0.3s ease,
    opacity 0.3s ease,
    content-visibility 0.3s ease allow-discrete;
}

details[open]::details-content {
  block-size: auto;
  opacity: 1;
  content-visibility: visible;
}

/* Fallback for older browsers */
@supports not selector(::details-content) {
  @keyframes faq-fade-in {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
  }
  details[open] > *:not(summary) {
    animation: faq-fade-in 0.3s ease forwards;
  }
}

details > div {
  padding-bottom: 1rem;
}

details > div > p {
  color: var(--color-text);
  text-align: left;
}



/* ========================================
   11. Responsive — Mobile
   ======================================== */
@media (max-width: 900px) {
  main {
    display: block;
  }

  main > [data-content="toc"] {
    position: static;
    max-height: none;
    overflow-y: visible;
    max-width: var(--content-max-width);
    padding: 0 1.5rem;
    margin-bottom: var(--section-gap);
  }

  [data-content] {
    max-width: 100%;
    padding: 0 1.25rem;
  }

  [data-content="hero"] {
    padding: clamp(3rem, 8vw, 5rem) 1rem clamp(2rem, 6vw, 3.5rem);
    width: 100%;
    margin-left: 0;
  }

  [data-content="hero"] h1 {
    font-size: clamp(1.6rem, 6vw, 2.5rem);
  }

  [data-content="hero"] .hero-description {
    font-size: 0.95rem;
  }

  [data-content="hero"] .hero-badge {
    font-size: 0.72rem;
    padding: 0.35rem 0.75rem;
  }

  .site-header {
    padding: 0.75rem 1rem;
  }
}

@media (max-width: 600px) {
  :root {
    --section-gap: 2.5rem;
  }

  table {
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .at-a-glance {
    grid-template-columns: 1fr;
  }

  [data-content="hero"] {
    padding: 2.5rem 0.85rem 2rem;
  }

  [data-content="hero"] h1 {
    font-size: clamp(1.4rem, 7vw, 2rem);
    line-height: 1.2;
  }

  [data-content="hero"] .hero-subtitle-hook {
    font-size: 0.68rem;
    letter-spacing: 0.08em;
  }

  [data-content="hero"] .hero-badges {
    gap: 0.5rem;
  }

  [data-content="hero"] .hero-badge {
    font-size: 0.68rem;
    padding: 0.3rem 0.65rem;
  }

  [data-content] {
    padding: 0 1rem;
  }

  .site-header {
    padding: 0.6rem 0.85rem;
    gap: 0.6rem;
    flex-wrap: wrap;
  }

  .date-badge {
    font-size: 0.65rem;
    padding: 0.25rem 0.6rem;
  }

  .trust-marker {
    font-size: 0.6rem;
  }
}

/* =========================================
   UNIVERSAL DESKTOP & MOBILE MENU + LOGO
   ========================================= */

/* Header Base */
.site-header {
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border, #333);
    position: sticky;
    top: 0;
    z-index: 100;
}

/* Mobile defaults for navigation bar */
.top-navigation-bar {
    width: 100%;
    margin: 0 auto;
    padding: 15px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Logo Fixes */
.site-logo img {
    max-height: 75px; 
    width: auto !important; 
    display: block;
    transition: transform 0.2s ease;
}

.site-logo img:hover {
    transform: scale(1.02);
}

/* Desktop Menu */
.site-nav--desktop {
    display: none; 
}

/* Desktop Grid Layout: Logo left, Menu center */
@media (min-width: 1024px) {
    .top-navigation-bar {
        max-width: 100%;
        padding: 15px 40px; 
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        align-items: center;
    }
    
    .site-logo {
        grid-column: 1;
        justify-self: start; 
        margin: 0;
    }

    .site-nav--desktop {
        display: block;
        grid-column: 2;
        justify-self: center; 
    }

    .mobile-controls {
        display: none; 
    }
    
    .menu-desktop {
        display: flex;
        gap: 30px;
        list-style: none;
        margin: 0;
        padding: 0;
    }
    
    .menu-desktop a {
        text-decoration: none;
        color: var(--color-text);
        font-family: var(--font-body, sans-serif);
        font-weight: 500;
        font-size: 16px;
        transition: color 0.2s ease;
    }
    
    .menu-desktop a:hover {
        color: var(--color-accent);
    }
}

/* Mobile Burger Button */
.burger {
    background: transparent;
    border: none;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 5px;
    z-index: 1000;
}

.burger span {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--color-text);
    transition: transform 0.3s ease, opacity 0.3s ease;
    border-radius: 2px;
}

/* Burger Animation to X */
.burger.is-active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}
.burger.is-active span:nth-child(2) {
    opacity: 0;
}
.burger.is-active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

/* Mobile Menu Slider */
.mobile-menu {
    position: fixed;
    top: 0;
    right: -100%; 
    width: 85%;
    max-width: 400px;
    height: 100vh;
    background-color: var(--color-bg);
    box-shadow: -5px 0 20px rgba(0,0,0,0.5);
    transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
    overflow-y: auto;
    padding: 60px 30px;
}

.mobile-menu.is-open {
    right: 0; 
}

.mobile-menu__close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    font-size: 36px;
    line-height: 1;
    color: var(--color-text);
    cursor: pointer;
    transition: color 0.2s ease;
}

.mobile-menu__close:hover {
    color: var(--color-accent);
}

.menu-mobile {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.menu-mobile a {
    text-decoration: none;
    color: var(--color-text);
    font-size: 20px;
    font-family: var(--font-display, sans-serif);
    font-weight: 600;
    display: block;
    transition: color 0.2s ease, padding-left 0.2s ease;
}

.menu-mobile a:hover {
    color: var(--color-accent);
    padding-left: 10px; 
}

/* Overlay */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(3px); 
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s;
    z-index: 998;
}

.mobile-menu-overlay.is-active {
    opacity: 1;
    visibility: visible;
}

/* =========================================
   4-COLUMN FOOTER (US Sweep Coin Casino Theme)
   ========================================= */
.site-footer-4col {
    background-color: var(--color-bg, #0b1120); /* Deep dark background */
    color: var(--color-text-secondary, #94a3b8);
    padding: 60px 20px 30px;
    margin-top: 80px;
    font-family: var(--font-body, sans-serif);
    border-top: 3px solid var(--color-accent, #f59e0b); /* Orange/Amber accent */
}

.footer-4col-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Legal Disclaimers Block */
.footer-disclaimers {
    font-size: 0.85rem;
    color: var(--color-text-secondary, #64748b);
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-disclaimers p {
    margin-bottom: 0.8rem;
    line-height: 1.6;
    text-align: left;
}

.footer-disclaimers a {
    color: var(--color-accent, #f59e0b);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

.footer-disclaimers a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* Grid Layout */
.footer-4col-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

@media (min-width: 768px) {
    .footer-4col-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .footer-4col-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 30px;
    }
}

/* Titles */
.widget-title {
    color: var(--color-accent, #f59e0b); 
    font-family: var(--font-display, sans-serif); 
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1.2rem;
    margin-top: 0;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* Lists */
.widget-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.widget-list li {
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--color-text-secondary, #94a3b8);
    line-height: 1.5;
}

.widget-list a {
    color: var(--color-text-secondary, #94a3b8);
    text-decoration: none;
    transition: color 0.2s ease;
}

.widget-list a:hover {
    color: var(--color-accent, #f59e0b);
}

/* Bullets */
.bullet-list li {
    position: relative;
    padding-left: 16px;
}

.bullet-list li::before {
    content: '•';
    color: var(--color-accent, #f59e0b); 
    position: absolute;
    left: 0;
    top: -2px;
    font-size: 1.5rem;
    line-height: 1;
}

.clean-list li {
    padding-left: 0;
    padding-bottom: 0.8rem;
}

.clean-list li::before {
    display: none;
}

.footer-4col-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding-top: 25px;
    text-align: center;
}

.footer-4col-bottom p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--color-text-secondary, #94a3b8);
    text-align: center;
}

/* Back to Top Button */
.back-to-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--color-accent, #f59e0b);
    color: #0b1120;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 99;
}

.back-to-top-btn.is-visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top-btn:hover {
    background-color: #d97706; /* Darker orange */
    transform: translateY(-5px);
    color: #0b1120;
}

[data-content="toc"] {
    top: 100px !important; 
    max-height: calc(100vh - 120px) !important; 
}

h1, h2, h3, h4, h5, h6 {
    scroll-margin-top: 110px !important; 
}