/* ═══════════════════════════════════════════════════════════
   SCROLLTRIGGER TUTORIAL — PONPON-MANIA INSPIRED DESIGN
   ═══════════════════════════════════════════════════════════ */

/* ===== CUSTOM PROPERTIES ===== */
:root {
  /* Core Palette */
  --cream: #fff5f0;
  --dark: #171717;
  --rose: #f1abbd;
  --peach: #feece3;
  --gold: #f7c704;
  --coral: #e8735a;
  --purple: #ae57ff;
  --mint: #b8e8d0;

  /* Semantic Tokens — Light */
  --bg-light: var(--cream);
  --bg-dark: var(--dark);
  --text-light: var(--dark);
  --text-dark: var(--cream);
  --text-muted-light: #6b5e54;
  --text-muted-dark: #a89e94;
  --accent: var(--rose);
  --accent-pop: var(--gold);
  --accent-coral: var(--coral);

  /* Typography */
  --font-display: 'Libre Franklin', 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'DM Mono', 'Fira Code', 'Courier New', monospace;

  /* Geometry */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 25px;
  --radius-pill: 999px;

  /* Shadows */
  --shadow-soft: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-pop: 0 8px 30px rgba(0, 0, 0, 0.12);
  --shadow-bold: 4px 4px 0px var(--dark);
  --shadow-bold-rose: 4px 4px 0px var(--rose);

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-light);
  background: var(--bg-light);
  overflow-x: hidden;
}

/* ===== HEADER / HERO ===== */
header {
  background: var(--dark);
  color: var(--text-dark);
  padding: var(--space-xl) var(--space-md);
  position: relative;
  overflow: hidden;
}

header::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, var(--rose) 0%, transparent 70%);
  opacity: 0.15;
  pointer-events: none;
}

header::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -15%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, var(--gold) 0%, transparent 70%);
  opacity: 0.08;
  pointer-events: none;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.header-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rose);
  margin-bottom: var(--space-md);
}

header h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 8vw, 5.5rem);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

header h1 em {
  font-style: italic;
  color: var(--rose);
}

.header-deck {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-muted-dark);
  max-width: 52ch;
  margin-bottom: var(--space-lg);
  line-height: 1.6;
}

/* Goal Box */
.goal-box {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-lg);
}

.goal-box h2 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--cream);
  margin-bottom: var(--space-sm);
}

.goal-box ul {
  list-style: none;
  padding-left: 0;
}

.goal-box li {
  padding: 0.4rem 0;
  padding-left: 1.8rem;
  position: relative;
  font-size: 0.95rem;
  color: var(--text-muted-dark);
}

.goal-box li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  color: var(--mint);
  font-weight: 700;
}

.goal-box li strong {
  color: var(--cream);
}

/* TOC */
.toc {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.toc-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  padding: 0.5rem 1.2rem;
  text-decoration: none;
  color: var(--cream);
  transition: background 0.2s, border-color 0.2s;
}

.toc-item:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--rose);
}

.toc-num {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--rose);
}

.toc-label {
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 700;
}

/* ===== PROGRESS BAR ===== */
.progress-container {
  background: var(--cream);
  padding: var(--space-sm) var(--space-md);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 0;
  z-index: 500;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--peach);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: 0.4rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(135deg, var(--rose) 0%, var(--coral) 100%);
  width: 0%;
  transition: width 0.5s ease;
  border-radius: var(--radius-pill);
}

.progress-text {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted-light);
  margin: 0;
}

/* ===== MAIN CONTENT ===== */
.tutorial-content {
  max-width: 100%;
  margin: 0 auto;
}

/* ===== TUTORIAL SECTIONS ===== */
.tutorial-section {
  padding: var(--space-xl) var(--space-md);
  scroll-margin-top: 4rem;
}

.tutorial-section > * {
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Light sections */
.section-light {
  background: var(--bg-light);
  color: var(--text-light);
}

/* Dark sections */
.section-dark {
  background: var(--bg-dark);
  color: var(--text-dark);
}

/* Section headings */
.tutorial-section h2 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 900;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.section-dark h2 {
  color: var(--cream);
}

.part-number {
  background: var(--rose);
  color: var(--dark);
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 900;
  flex-shrink: 0;
}

.section-dark .part-number {
  background: var(--gold);
}

/* H3 */
.tutorial-section h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  margin-top: var(--space-md);
  margin-bottom: var(--space-sm);
  padding-left: var(--space-sm);
  border-left: 6px solid var(--rose);
}

.section-dark h3 {
  border-left-color: var(--gold);
  color: var(--cream);
}

/* Paragraphs */
.tutorial-section p {
  margin-bottom: var(--space-sm);
  font-size: 1.05rem;
}

.section-dark p {
  color: var(--text-muted-dark);
}

.tutorial-section strong {
  color: var(--coral);
}

.section-dark strong {
  color: var(--gold);
}

/* Inline code */
.tutorial-section code:not(pre code) {
  background: var(--peach);
  color: var(--coral);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.88em;
}

.section-dark code:not(pre code) {
  background: rgba(255, 255, 255, 0.08);
  color: var(--gold);
}

/* Lists */
.tutorial-section ul,
.tutorial-section ol {
  margin: var(--space-sm) 0;
  padding-left: 1.8rem;
}

.tutorial-section li {
  margin: 0.4rem 0;
  font-size: 1rem;
}

/* ===== CODE BLOCKS ===== */
.code-block-wrapper {
  position: relative;
  margin: var(--space-sm) 0 var(--space-md) 0;
}

pre {
  background: #1e1a17;
  color: #e8dcc8;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  border: 2px solid #2e2a27;
  box-shadow: var(--shadow-bold);
}

.section-dark pre {
  background: #0d0d0d;
  border-color: #2a2a2a;
  box-shadow: 4px 4px 0px var(--rose);
}

pre::-webkit-scrollbar {
  height: 6px;
}

pre::-webkit-scrollbar-track {
  background: #0d0d0d;
  border-radius: 3px;
}

pre::-webkit-scrollbar-thumb {
  background: #3a3530;
  border-radius: 3px;
}

pre::-webkit-scrollbar-thumb:hover {
  background: #5a5550;
}

code {
  font-family: var(--font-mono);
}

/* Copy Code Button */
.copy-code-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: rgba(255, 255, 255, 0.08);
  color: #e8dcc8;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 400;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: background 0.2s, transform 0.15s;
  z-index: 10;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.copy-code-btn:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-1px);
}

.copy-code-btn.copied {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--dark);
}

.copy-code-btn .icon {
  font-size: 0.9rem;
  line-height: 1;
}

/* ===== INFO BOXES ===== */
.info-box {
  background: var(--peach);
  border-left: 6px solid var(--rose);
  padding: 1.5rem;
  margin: var(--space-md) 0;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.info-box h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.info-box p {
  margin-bottom: 0.5rem;
  font-size: 0.95rem;
  color: var(--dark);
}

.info-box ul,
.info-box ol {
  margin-top: 0.5rem;
}

.info-box li {
  color: var(--dark);
  font-size: 0.95rem;
}

/* Strategy variant */
.info-box.strategy {
  background: #fef9e7;
  border-left-color: var(--gold);
}

.info-box.strategy h4 {
  color: #5c4b00;
}

/* Warning variant */
.info-box.warning {
  background: #fde8e5;
  border-left-color: var(--coral);
}

.info-box.warning h4 {
  color: #8b2500;
}

/* Success variant */
.info-box.success {
  background: #e6f7ed;
  border-left-color: #38a169;
}

.info-box.success h4 {
  color: #1a5c32;
}

/* Dark section info box variants */
.info-box-dark {
  background: rgba(255, 255, 255, 0.06);
  border-left-color: var(--gold);
}

.info-box-dark h4,
.info-box-dark p {
  color: var(--cream);
}

.section-dark .info-box.warning {
  background: rgba(232, 115, 90, 0.12);
  border-left-color: var(--coral);
}

.section-dark .info-box.warning h4 {
  color: var(--coral);
}

.section-dark .info-box.warning p,
.section-dark .info-box.warning li {
  color: var(--text-muted-dark);
}

/* ===== CONFIG TABLE ===== */
.config-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-sm) 0 var(--space-md) 0;
  font-size: 0.9rem;
}

.config-table th {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-align: left;
  padding: 0.8rem;
  border-bottom: 2px solid var(--dark);
  color: var(--text-muted-light);
}

.config-table td {
  padding: 0.8rem;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  vertical-align: top;
}

.config-table td code {
  font-size: 0.82rem;
}

/* ===== CHECKPOINTS ===== */
.checkpoint {
  background: white;
  border: 2px solid rgba(0, 0, 0, 0.08);
  padding: var(--space-sm) 1.5rem;
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
  transition: background 0.3s, border-color 0.3s;
}

.checkpoint:hover {
  border-color: var(--rose);
}

.checkpoint label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: 1rem;
  font-weight: 500;
}

.checkpoint input[type="checkbox"] {
  width: 22px;
  height: 22px;
  cursor: pointer;
  accent-color: var(--rose);
  flex-shrink: 0;
}

.checkpoint.completed {
  background: #e6f7ed;
  border-color: #38a169;
}

/* Dark checkpoints */
.checkpoint-dark {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--cream);
}

.checkpoint-dark:hover {
  border-color: var(--gold);
}

.checkpoint-dark.completed {
  background: rgba(56, 161, 105, 0.15);
  border-color: #38a169;
}

/* ===== REFLECTION BOXES ===== */
.reflection-box {
  background: rgba(241, 171, 189, 0.08);
  border: 2px dashed var(--rose);
  padding: 1.5rem;
  margin: var(--space-md) 0;
  border-radius: var(--radius-md);
}

.reflection-box h4 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--coral);
  margin-bottom: 0.8rem;
}

.reflection-box p {
  font-style: italic;
  color: var(--text-muted-light);
  margin-bottom: var(--space-sm);
  font-size: 0.95rem;
}

.response-area {
  width: 100%;
  padding: var(--space-sm);
  border: 2px solid rgba(0, 0, 0, 0.08);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.6;
  resize: vertical;
  min-height: 80px;
  transition: border-color 0.2s;
  background: white;
}

.response-area:focus {
  outline: none;
  border-color: var(--rose);
}

.save-indicator {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #38a169;
  margin-top: 0.4rem;
  opacity: 0;
  transition: opacity 0.3s;
}

.save-indicator.visible {
  opacity: 1;
}

/* Dark reflection boxes */
.reflection-box-dark {
  background: rgba(247, 199, 4, 0.05);
  border-color: var(--gold);
}

.reflection-box-dark h4 {
  color: var(--gold);
}

.reflection-box-dark p {
  color: var(--text-muted-dark);
}

.reflection-box-dark .response-area {
  background: rgba(255, 255, 255, 0.04);
  border-color: rgba(255, 255, 255, 0.1);
  color: var(--cream);
}

.reflection-box-dark .response-area:focus {
  border-color: var(--gold);
}

/* ===== SOLUTION BOXES ===== */
.solution-box {
  margin: var(--space-sm) 0 var(--space-md) 0;
  border: 2px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all 0.3s;
}

.solution-box.hidden {
  display: none;
}

.solution-box pre {
  margin: 0;
  border-radius: 0;
  border: none;
  box-shadow: none;
}

.show-solution {
  background: var(--dark);
  color: var(--cream);
  border: 2px solid var(--dark);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-lg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: var(--shadow-bold-rose);
}

.show-solution:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px var(--rose);
}

.show-solution:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0px var(--rose);
}

/* Dark section variant */
.show-solution-dark {
  background: var(--cream);
  color: var(--dark);
  border-color: var(--cream);
  box-shadow: 4px 4px 0px var(--gold);
}

.show-solution-dark:hover {
  box-shadow: 6px 6px 0px var(--gold);
}

.show-solution-dark:active {
  box-shadow: 2px 2px 0px var(--gold);
}

/* ═══════════════════════════════════════════════════════════
   DEMO ZONES
   ═══════════════════════════════════════════════════════════ */

.demo-zone {
  width: 100vw;
  margin-left: 50%;
  transform: translateX(-50%);
  padding: var(--space-lg) var(--space-md);
  position: relative;
}

.demo-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  text-align: center;
  margin-bottom: var(--space-md);
  max-width: none;
}

/* Demo Toolbar (label + reset button) */
.demo-toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  max-width: none;
}

.demo-toolbar .demo-label {
  margin-bottom: 0;
}

.demo-reset-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  background: white;
  color: var(--dark);
  border: 2px solid var(--dark);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
  box-shadow: 2px 2px 0px var(--rose);
  flex-shrink: 0;
}

.demo-reset-btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 3px 3px 0px var(--rose);
  background: var(--peach);
}

.demo-reset-btn:active {
  transform: translate(0, 0);
  box-shadow: 1px 1px 0px var(--rose);
}

.demo-reset-icon {
  font-size: 0.9rem;
  line-height: 1;
}

/* ── DEMO 1: TRIGGER CARDS ── */
.demo-trigger {
  background: var(--peach);
  border-top: 2px solid var(--rose);
  border-bottom: 2px solid var(--rose);
}

.demo-trigger .demo-label {
  color: var(--coral);
}

.demo-cards-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .demo-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .demo-cards-grid {
    grid-template-columns: 1fr;
  }
}

.demo-card {
  background: white;
  border: 2px solid var(--dark);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
  box-shadow: var(--shadow-bold);
  opacity: 0;
  transform: translateY(50px) scale(0.92);
  will-change: transform, opacity;
}

.demo-card-icon {
  display: block;
  font-size: 2rem;
  margin-bottom: 0.8rem;
  color: var(--coral);
}

.demo-card h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--dark);
}

.demo-card p {
  font-size: 0.8rem;
  color: var(--text-muted-light);
  line-height: 1.5;
  margin: 0;
}

/* ── DEMO 2: SCRUB HEADLINES ── */
.demo-scrub {
  background: #0d0d0d;
  border-top: 2px solid rgba(247, 199, 4, 0.3);
  border-bottom: 2px solid rgba(247, 199, 4, 0.3);
  min-height: 70vh;
}

.demo-scrub .demo-label {
  color: var(--gold);
}

.demo-scrub-track {
  max-width: 900px;
  margin: 0 auto var(--space-md) auto;
  height: 4px;
  background: rgba(255, 255, 255, 0.1);
  position: relative;
  border-radius: var(--radius-pill);
}

.demo-scrub-fill {
  height: 100%;
  background: var(--gold);
  width: 0%;
  border-radius: var(--radius-pill);
  transition: width 0.1s;
}

.demo-scrub-label {
  position: absolute;
  right: 0;
  top: -1.5rem;
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.3);
}

.demo-headline-wrap {
  overflow: hidden;
  max-width: 900px;
  margin: 0 auto;
}

.demo-headline {
  font-family: var(--font-display);
  font-size: clamp(3rem, 10vw, 8rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--cream);
  display: block;
}

.demo-hl {
  opacity: 0;
  will-change: transform, opacity;
}

#demo-hl1 { transform: translateX(-120%); }
#demo-hl2 { transform: translateX(120%); }
#demo-hl3 { transform: translateX(-120%); }

.demo-hl-right {
  text-align: right;
}

.demo-scrub-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 900px;
  margin: var(--space-md) auto 0 auto;
  padding-top: var(--space-md);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.demo-scrub-caption {
  max-width: 45ch;
  font-size: 0.85rem;
  color: var(--text-muted-dark);
  line-height: 1.5;
  margin: 0;
}

.demo-scrub-caption code {
  background: rgba(247, 199, 4, 0.15);
  color: var(--gold);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.82em;
}

.demo-scrub-pct {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--gold);
  border-radius: var(--radius-pill);
}

/* ── DEMO 3: PIN + TIMELINE ── */
.demo-pin {
  width: 100vw;
  max-width: none;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  transform: none;
  background: var(--dark);
  border-top: 2px solid var(--rose);
  border-bottom: 2px solid var(--rose);
  padding: 0;
}

.demo-pin > .demo-label {
  padding: var(--space-md) var(--space-md) 0 var(--space-md);
  color: var(--rose);
  max-width: none;
}

.demo-pin-stage {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 100vh;
  align-items: start;
}

@media (max-width: 768px) {
  .demo-pin-stage {
    grid-template-columns: 1fr;
  }
}

.demo-pin-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg) var(--space-md);
  background: #0d0d0d;
  min-height: 100svh;
  align-self: start;
  will-change: transform;
}

.demo-pin-card {
  width: 100%;
  max-width: 320px;
  aspect-ratio: 3/4;
  background: #1e1a17;
  border: 1px solid #2e2a27;
  border-radius: var(--radius-md);
  position: relative;
  overflow: hidden;
}

.demo-pin-stripe {
  position: absolute;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--rose);
  top: 30%;
  opacity: 0;
  will-change: transform, opacity;
}

.demo-pin-card-content {
  position: absolute;
  bottom: 1.5rem;
  left: 1.5rem;
  right: 1.5rem;
}

.demo-pin-kicker {
  font-family: var(--font-mono);
  font-size: 0.55rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--rose);
  margin-bottom: 0.4rem;
}

.demo-pin-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--cream);
  line-height: 1.1;
  opacity: 0;
  transform: translateY(20px);
  will-change: transform, opacity;
}

.demo-pin-subtitle {
  margin-top: 0.6rem;
  font-size: 0.75rem;
  color: var(--text-muted-dark);
  line-height: 1.5;
  opacity: 0;
  transform: translateY(20px);
  will-change: transform, opacity;
}

.demo-pin-cta {
  display: inline-block;
  margin-top: 1rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cream);
  border: 1px solid var(--cream);
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  opacity: 0;
  transform: translateY(20px);
  will-change: transform, opacity;
}

.demo-pin-dots {
  display: flex;
  gap: 0.5rem;
  margin-top: var(--space-sm);
}

.demo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #3a3530;
  transition: background 0.3s;
}

.demo-dot.active {
  background: var(--rose);
}

.demo-pin-right {
  padding: var(--space-lg) var(--space-md);
}

.demo-pin-step {
  min-height: 50vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-md) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.demo-pin-step:last-child {
  border-bottom: none;
}

.demo-step-num {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-muted-dark);
  margin-bottom: 0.8rem;
}

.demo-pin-step h3 {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 800;
  color: var(--cream);
  margin-bottom: 0.8rem;
  line-height: 1.2;
  padding: 0;
  border: none;
  max-width: none;
}

.demo-pin-step h3 em {
  font-style: italic;
  color: var(--rose);
}

.demo-pin-step p {
  max-width: 36ch;
  color: var(--text-muted-dark);
  font-size: 0.95rem;
  margin: 0;
}

.demo-pin-step code {
  background: rgba(241, 171, 189, 0.1);
  color: var(--rose);
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* ===== CODE RECAP TABS ===== */
.recap-section h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
}

.tab-bar {
  display: flex;
  gap: 0;
  margin-top: var(--space-md);
  margin-bottom: 0;
}

.tab-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.7rem 1.4rem;
  background: var(--peach);
  color: var(--text-muted-light);
  border: 2px solid var(--peach);
  border-bottom: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.tab-btn:hover {
  background: var(--rose);
  color: var(--dark);
}

.tab-btn.active {
  background: #1e1a17;
  color: #e8dcc8;
  border-color: #1e1a17;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.tab-panel .code-block-wrapper {
  margin-top: 0;
}

.tab-panel pre {
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
}

/* ===== COMPLETION SECTION ===== */
.completion-section {
  border-top: 4px solid var(--rose);
}

.completion-section h2 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  color: var(--coral);
}

/* ===== EXPORT SECTION ===== */
.export-section {
  background: var(--peach);
  padding: var(--space-md);
  text-align: center;
}

#export-responses {
  background: var(--dark);
  color: var(--cream);
  border: 2px solid var(--dark);
  padding: 0.8rem 2rem;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: var(--shadow-bold-rose);
}

#export-responses:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0px var(--rose);
}

#export-responses:active {
  transform: translate(0, 0);
  box-shadow: 2px 2px 0px var(--rose);
}

/* ===== FOOTER ===== */
footer {
  background: var(--dark);
  color: var(--text-muted-dark);
  text-align: center;
  padding: var(--space-lg) var(--space-md);
}

.footer-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--cream);
  margin-bottom: 0.4rem;
}

.footer-meta {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted-dark);
  margin-bottom: var(--space-sm);
}

.footer-note {
  max-width: 55ch;
  margin: 0 auto;
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 768px) {
  :root {
    --space-lg: 3rem;
    --space-xl: 4rem;
  }

  .tutorial-section {
    padding: var(--space-lg) var(--space-sm);
  }

  .tutorial-section > * {
    max-width: 100%;
  }

  header {
    padding: var(--space-lg) var(--space-sm);
  }

  .toc {
    gap: 0.5rem;
  }

  .toc-item {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
  }

  .demo-pin-stage {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .demo-pin-left {
    padding: var(--space-md);
    min-height: auto;
    will-change: auto;
  }

  .demo-pin-step {
    min-height: auto;
    padding: var(--space-md) 0;
  }

  .demo-scrub {
    min-height: auto;
    padding: var(--space-md) var(--space-sm);
  }

  .demo-headline {
    font-size: clamp(2rem, 12vw, 5rem);
  }

  .tab-btn {
    padding: 0.5rem 0.8rem;
    font-size: 0.6rem;
  }
}

/* ═══════════════════════════════════════════════════════════
   REDUCED MOTION
   ═══════════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  /* Make all demo elements visible without animation */
  .demo-card {
    opacity: 1 !important;
    transform: none !important;
  }

  .demo-hl {
    opacity: 1 !important;
    transform: none !important;
  }

  .demo-pin-title,
  .demo-pin-subtitle,
  .demo-pin-cta,
  .demo-pin-stripe {
    opacity: 1 !important;
    transform: none !important;
  }

  .demo-scrub-fill {
    width: 100% !important;
  }
}

/* ===== FOCUS STATES ===== */
:focus-visible {
  outline: 3px solid var(--rose);
  outline-offset: 3px;
}

.section-dark :focus-visible {
  outline-color: var(--gold);
}

button:focus-visible {
  outline: 3px solid var(--rose);
  outline-offset: 3px;
}