/* ==========================================================================
   Claude Editorial Design System (design.md Specification)
   - Canvas: #faf9f5 (Warm Cream)
   - Primary Accent: #cc785c (Coral)
   - Surface Dark: #181715 (Navy)
   - Typography: Noto Sans KR, Cormorant Garamond, Inter, JetBrains Mono
   ========================================================================== */

:root {
  /* Brand & Accent Colors */
  --colors-primary: #cc785c;
  --colors-primary-active: #a9583e;
  --colors-primary-disabled: #e6dfd8;
  --colors-accent-teal: #5db8a6;
  --colors-accent-amber: #e8a55a;

  /* Surface Colors */
  --colors-canvas: #faf9f5;
  --colors-surface-soft: #f5f0e8;
  --colors-surface-card: #efe9de;
  --colors-surface-cream-strong: #e8e0d2;
  --colors-surface-dark: #181715;
  --colors-surface-dark-elevated: #252320;
  --colors-surface-dark-soft: #1f1e1b;

  /* Borders & Hairlines */
  --colors-hairline: #e6dfd8;
  --colors-hairline-soft: #ebe6df;

  /* Text Colors */
  --colors-ink: #141413;
  --colors-body-strong: #252523;
  --colors-body: #3d3d3a;
  --colors-muted: #6c6a64;
  --colors-muted-soft: #8e8b82;
  --colors-on-primary: #ffffff;
  --colors-on-dark: #faf9f5;
  --colors-on-dark-soft: #a09d96;

  /* Fonts */
  --font-kr: "Noto Sans KR", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: "Cormorant Garamond", Georgia, serif;
  --font-sans: "Inter", "Noto Sans KR", sans-serif;
  --font-mono: "JetBrains Mono", monospace;

  /* Radii */
  --rounded-xs: 4px;
  --rounded-sm: 6px;
  --rounded-md: 8px;
  --rounded-lg: 12px;
  --rounded-xl: 16px;
  --rounded-pill: 9999px;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 12px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  --spacing-section: 80px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--colors-canvas);
  color: var(--colors-ink);
  font-family: var(--font-kr);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

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

/* ==========================================================================
   TOP NAVIGATION BAR
   ========================================================================== */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: 64px;
  background-color: rgba(250, 249, 245, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--colors-hairline);
  display: flex;
  align-items: center;
  padding: 6px 0;
}

.nav-container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-spike {
  color: var(--colors-primary);
}

.brand-title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.3px;
  color: var(--colors-ink);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-btn {
  background: transparent;
  border: none;
  font-family: var(--font-kr);
  padding: 5px 10px;
  border-radius: var(--rounded-md);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  min-height: 42px;
  min-width: 88px;
  text-align: center;
}

.nav-maintext {
  font-size: 13px;
  font-weight: 700;
  color: var(--colors-ink);
  line-height: 1.2;
  pointer-events: none;
}

.nav-subtext {
  font-size: 11px;
  font-weight: 500;
  color: var(--colors-muted);
  line-height: 1.2;
  margin-top: 2px;
  pointer-events: none;
}

.nav-btn:hover {
  background-color: var(--colors-surface-soft);
}

.nav-btn.active {
  background-color: var(--colors-surface-card);
  box-shadow: inset 0 -2px 0 var(--colors-primary);
}

.nav-btn.active .nav-maintext {
  color: var(--colors-primary);
}

.nav-btn.active .nav-subtext {
  color: var(--colors-body-strong);
}

.btn-nav-action {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background-color: var(--colors-surface-card);
  color: var(--colors-ink);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: var(--rounded-md);
  border: 1px solid var(--colors-hairline);
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.notion-icon {
  fill: currentColor;
  flex-shrink: 0;
}

.btn-nav-action:hover {
  background-color: var(--colors-surface-cream-strong);
}

/* ==========================================================================
   HERO BAND
   ========================================================================== */
.hero-band {
  padding: 48px 0 40px 0;
  border-bottom: 1px solid var(--colors-hairline);
  background-color: var(--colors-canvas);
}

.hero-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 40px;
  align-items: center;
}

.hero-text-box {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.hero-badge-group {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.badge-coral {
  background-color: var(--colors-primary);
  color: var(--colors-on-primary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2px;
  padding: 4px 12px;
  border-radius: var(--rounded-pill);
}

.badge-sub-info {
  font-size: 13px;
  color: var(--colors-muted);
  font-weight: 500;
}

.hero-headline {
  font-family: var(--font-kr);
  font-size: 40px;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.8px;
  color: var(--colors-ink);
  margin-bottom: 16px;
}

.highlight-text {
  color: var(--colors-primary);
  position: relative;
  display: inline-block;
}

.hero-description {
  font-size: 16px;
  color: var(--colors-body);
  line-height: 1.6;
  word-break: keep-all;
}

/* Hero Right Visual Box */
.hero-illustration-card {
  background-color: var(--colors-surface-dark);
  border-radius: var(--rounded-xl);
  padding: 20px;
  color: var(--colors-on-dark);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.illustration-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.window-controls {
  display: flex;
  gap: 6px;
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red {
  background-color: #ef4444;
}

.dot.yellow {
  background-color: #f59e0b;
}

.dot.green {
  background-color: #10b981;
}

.card-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--colors-on-dark-soft);
}

.illustration-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.workflow-card {
  display: flex;
  align-items: center;
  gap: 14px;
  background-color: var(--colors-surface-dark-soft);
  padding: 12px 16px;
  border-radius: var(--rounded-md);
  border: 1px solid rgba(255, 255, 255, 0.06);
  cursor: pointer;
  transition: all 0.2s ease;
}

/* Step Guide Image Optimization Style */
.step-guide-img {
  width: 100%;
  max-width: 100%;
  border-radius: 12px;
  margin: 16px 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.3);
  display: block;
  object-fit: contain;
}

.workflow-card:hover {
  background-color: var(--colors-surface-dark-elevated);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateX(2px);
}

.workflow-card.active-step {
  border-color: var(--colors-primary);
  background-color: rgba(204, 120, 92, 0.12);
}

.workflow-badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  color: var(--colors-on-dark-soft);
  background-color: rgba(255, 255, 255, 0.1);
  padding: 4px 8px;
  border-radius: var(--rounded-xs);
}

.workflow-badge.highlight {
  color: var(--colors-primary);
  background-color: rgba(204, 120, 92, 0.2);
}

.workflow-content {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.workflow-content strong {
  font-size: 14px;
  color: var(--colors-on-dark);
}

.workflow-content p {
  font-size: 12px;
  color: var(--colors-on-dark-soft);
}

.arrow-icon {
  color: var(--colors-muted);
  font-size: 14px;
}

/* ==========================================================================
   CURRICULUM SUMMARY SECTION (REQUEST #2 IMPLEMENTATION)
   ========================================================================== */
.curriculum-summary-box {
  background-color: var(--colors-surface-soft);
  border-radius: var(--rounded-lg);
  padding: 28px;
  border: 1px solid var(--colors-hairline);
  margin-bottom: 32px;
}

.curriculum-steps-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 16px;
}

.curriculum-steps-container-2col {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 16px;
}

.curriculum-step-card {
  background-color: var(--colors-canvas);
  border: 1px solid var(--colors-hairline);
  border-radius: var(--rounded-md);
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.step-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--colors-hairline-soft);
}

.step-card-header .badge-line1 {
  font-size: 15px;
  font-weight: 700;
  color: var(--colors-primary);
}

.badge-time {
  font-size: 11px;
  font-weight: 600;
  color: var(--colors-muted);
  background-color: var(--colors-surface-card);
  padding: 2px 8px;
  border-radius: var(--rounded-pill);
}

.step-card-content {
  font-size: 13px;
  color: var(--colors-body);
  line-height: 1.55;
  flex-grow: 1;
}

.step-card-content strong {
  color: var(--colors-ink);
  font-size: 14px;
  display: block;
  margin-bottom: 4px;
}

.step-card-content ul {
  list-style-type: disc;
  padding-left: 18px;
  margin-bottom: 10px;
}

.step-card-content ul li {
  margin-bottom: 3px;
}

.margin-top-xs {
  margin-top: 8px;
}

.margin-bottom-md {
  margin-bottom: 20px;
}

.sub-link-group-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--colors-body-strong);
  margin-bottom: 10px;
  padding-left: 4px;
  border-left: 3px solid var(--colors-primary);
}

/* ==========================================================================
   TWO-LINE BADGES
   ========================================================================== */
.card-badge-two-line {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  background-color: var(--colors-canvas);
  border: 1px solid var(--colors-hairline);
  padding: 4px 10px;
  border-radius: var(--rounded-md);
  margin-bottom: 4px;
}

.card-badge-two-line .badge-line1 {
  font-size: 11px;
  font-weight: 700;
  color: var(--colors-primary);
  text-transform: uppercase;
}

.card-badge-two-line .badge-line2 {
  font-size: 12px;
  font-weight: 500;
  color: var(--colors-body-strong);
}

.badge-two-line-coral {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  background-color: var(--colors-primary);
  color: var(--colors-on-primary);
  padding: 6px 14px;
  border-radius: var(--rounded-md);
  margin-bottom: 8px;
  box-shadow: 0 2px 6px rgba(204, 120, 92, 0.2);
}

.badge-two-line-coral .line1 {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  opacity: 0.9;
}

.badge-two-line-coral .line2 {
  font-size: 13px;
  font-weight: 600;
}

.badge-header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.badge-header-row .badge-two-line-coral {
  margin-bottom: 0;
}

.btn-promptories {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: linear-gradient(135deg, var(--colors-primary), #e88a6d);
  color: #ffffff;
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--rounded-pill);
  text-decoration: none;
  box-shadow: 0 2px 8px rgba(204, 120, 92, 0.25);
  transition: all 0.2s ease;
}

.btn-promptories:hover {
  background: linear-gradient(135deg, var(--colors-primary-active), var(--colors-primary));
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(204, 120, 92, 0.4);
  color: #ffffff;
  text-decoration: none;
}

.margin-top-sm {
  margin-top: 6px;
}

/* ==========================================================================
   TAB CONTENTS & SECTIONS
   ========================================================================== */
.tab-pane {
  display: none;
  padding: 40px 0 var(--spacing-xxl) 0;
}

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

.section-head {
  margin-bottom: 36px;
}

.section-title {
  font-family: var(--font-kr);
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--colors-ink);
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 15px;
  color: var(--colors-muted);
}

.sub-section-header {
  font-size: 22px;
  font-weight: 700;
  color: var(--colors-ink);
  margin-bottom: 20px;
}

/* Prompt Card List */
.prompt-card-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 36px;
}

.prompt-card {
  position: relative;
  background-color: var(--colors-surface-card);
  border-radius: var(--rounded-md);
  padding: 20px 22px 32px 22px;
  border: 1px solid var(--colors-hairline);
}

.prompt-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.prompt-card-head strong {
  font-size: 15px;
  color: var(--colors-ink);
}

.prompt-card-body {
  font-size: 14px;
  color: var(--colors-body-strong);
  background-color: var(--colors-canvas);
  padding: 14px 18px;
  border-radius: var(--rounded-sm);
  border: 1px solid var(--colors-hairline-soft);
  line-height: 1.6;
  word-break: break-word;
}

.prompt-card-body.collapsible {
  max-height: 90px;
  overflow: hidden;
  position: relative;
  transition: max-height 0.3s ease-in-out;
}

.prompt-card-body.collapsible::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40px;
  background: linear-gradient(transparent, var(--colors-canvas));
  pointer-events: none;
}

.prompt-card-body.collapsible.expanded {
  max-height: 2000px;
}

.prompt-card-body.collapsible.expanded::after {
  display: none;
}

.btn-toggle-expand {
  background: transparent;
  border: none;
  color: var(--colors-primary);
  padding: 0;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  position: absolute;
  right: 24px;
  bottom: 10px;
  z-index: 5;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  transition: opacity 0.2s ease;
}

.btn-toggle-expand:hover {
  background: transparent;
  text-decoration: underline;
  opacity: 0.85;
}

/* Feature Cards Grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 48px;
}

.feature-card {
  background-color: var(--colors-surface-card);
  border-radius: var(--rounded-lg);
  padding: 26px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  border: 1px solid var(--colors-hairline);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(20, 20, 19, 0.06);
}

.card-headline {
  font-size: 20px;
  font-weight: 700;
  color: var(--colors-ink);
}

.card-body {
  font-size: 14px;
  color: var(--colors-body);
  flex-grow: 1;
  line-height: 1.55;
}

.btn-text-link {
  background: transparent;
  border: none;
  color: var(--colors-primary);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
}

.btn-text-link:hover {
  text-decoration: underline;
}

.btn-copy {
  background-color: var(--colors-primary);
  color: var(--colors-on-primary);
  border: none;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--rounded-sm);
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.btn-copy:hover {
  background-color: var(--colors-primary-active);
}

.btn-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-ext-link {
  display: inline-flex;
  align-items: center;
  background: transparent;
  color: var(--colors-primary);
  border: none;
  font-size: 13px;
  font-weight: 600;
  padding: 0 4px;
  text-decoration: none;
  cursor: pointer;
  transition: all 0.2s ease;
  line-height: 1;
}

.btn-ext-link:hover {
  background: transparent;
  color: var(--colors-primary-active);
  text-decoration: underline;
}

.code-header .btn-ext-link {
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--colors-on-dark);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.code-header .btn-ext-link:hover {
  background-color: var(--colors-primary);
  color: var(--colors-on-primary);
  border-color: var(--colors-primary);
}

/* Resources Box */
.resources-box {
  background-color: var(--colors-surface-soft);
  border-radius: var(--rounded-lg);
  padding: 32px 36px;
  border: 1px solid var(--colors-hairline);
}

.resources-title {
  font-size: 19px;
  font-weight: 700;
  color: var(--colors-ink);
  margin-bottom: 20px;
}

.download-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.download-tile {
  display: flex;
  align-items: center;
  gap: 16px;
  background-color: var(--colors-canvas);
  border: 1px solid var(--colors-hairline);
  border-radius: var(--rounded-md);
  padding: 18px 20px;
  text-decoration: none;
  color: var(--colors-ink);
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.download-tile:hover {
  background-color: var(--colors-surface-card);
  border-color: var(--colors-primary);
}

.file-icon {
  font-size: 24px;
}

.file-info {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.file-info strong {
  font-size: 14px;
  font-weight: 700;
}

.file-info span {
  font-size: 12px;
  color: var(--colors-muted);
}

.download-btn-text {
  font-size: 13px;
  font-weight: 600;
  color: var(--colors-primary);
}

/* Code Window Card */
.code-window-card {
  background-color: var(--colors-surface-dark);
  border-radius: var(--rounded-lg);
  padding: 24px 28px;
  color: var(--colors-on-dark);
  margin-bottom: 0;
}

.tab-pane > .code-window-card {
  margin-bottom: 36px;
}

.code-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  margin-bottom: 16px;
}

.code-title {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--colors-on-dark-soft);
}

pre {
  background-color: var(--colors-surface-dark-soft);
  padding: 18px 20px;
  border-radius: var(--rounded-md);
  overflow-x: auto;
}

code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: #e2e8f0;
}

.margin-top-lg {
  margin-top: 52px;
}

/* Footer */
.site-footer {
  background-color: var(--colors-surface-dark);
  color: var(--colors-on-dark-soft);
  padding: 48px 0;
  margin-top: var(--spacing-section);
}

.footer-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--colors-on-dark);
  font-size: 14px;
}

.footer-text {
  font-size: 13px;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--colors-surface-dark);
  color: var(--colors-on-dark);
  padding: 12px 20px;
  border-radius: var(--rounded-md);
  font-size: 14px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  animation: fadeIn 0.3s ease;
}

/* Modal / Screentip Popup */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(18, 17, 16, 0.7);
  backdrop-filter: blur(6px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}

.modal-content {
  background-color: var(--colors-canvas);
  border: 1px solid var(--colors-hairline);
  border-radius: var(--rounded-xl);
  max-width: 580px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  border-bottom: 1px solid var(--colors-hairline);
  background-color: var(--colors-surface-soft);
}

.modal-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--colors-ink);
}

.btn-modal-close {
  background: transparent;
  border: none;
  font-size: 24px;
  line-height: 1;
  color: var(--colors-muted);
  cursor: pointer;
  padding: 0 4px;
  transition: color 0.2s ease;
}

.btn-modal-close:hover {
  color: var(--colors-ink);
}

.modal-body {
  padding: 24px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--colors-body-strong);
  max-height: 70vh;
  overflow-y: auto;
}

.modal-intro {
  margin-bottom: 16px;
  color: var(--colors-body);
  background-color: var(--colors-surface-card);
  padding: 12px 16px;
  border-radius: var(--rounded-md);
  border-left: 3px solid var(--colors-primary);
}

.modal-tip-list {
  padding-left: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.modal-tip-list li {
  color: var(--colors-ink);
}

.modal-tip-list li strong {
  color: var(--colors-primary);
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--colors-hairline);
  display: flex;
  justify-content: flex-end;
  background-color: var(--colors-surface-soft);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(100%);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hidden {
  display: none !important;
}

/* Step Guide Image Optimization Style (Natural Size Left Aligned) */
.step-guide-img {
  width: auto;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  margin: 28px 0 44px 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
  display: block;
  object-fit: contain;
  box-sizing: border-box;
}

/* Video Grid Layout */
.video-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.video-card {
  background-color: var(--colors-surface-card);
  border: 1px solid var(--colors-hairline);
  border-radius: var(--rounded-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.04);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.video-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.video-responsive {
  position: relative;
  width: 100%;
  padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
  height: 0;
  background-color: #000;
}

.video-responsive iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card-body {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--colors-canvas);
  border-top: 1px solid var(--colors-hairline-soft);
}

.video-card-body strong {
  font-size: 15px;
  color: var(--colors-ink);
}

/* Responsive Styles */
@media (max-width: 900px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-headline {
    font-size: 32px;
  }

  .curriculum-steps-container,
  .feature-grid,
  .download-grid,
  .video-grid,
  .copyright-grid,
  .cinemastudio-item > div,
  .skill-register-container {
    grid-template-columns: 1fr !important;
  }

  .nav-links {
    display: none;
  }
}

/* ==========================================================================
   COURSE SEGMENTED SWITCHER (Top Nav Switcher)
   ========================================================================== */
.course-switcher {
  position: relative;
  display: inline-flex;
  align-items: center;
  background-color: var(--colors-surface-soft);
  border: 1px solid var(--colors-hairline);
  padding: 4px;
  border-radius: var(--rounded-pill);
  gap: 4px;
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
}

.switcher-btn {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: none;
  background: transparent;
  color: var(--colors-muted);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  border-radius: var(--rounded-pill);
  cursor: pointer;
  transition: all 0.25s ease;
  white-space: nowrap;
}

.switcher-btn .switcher-icon {
  font-size: 14px;
  line-height: 1;
}

.switcher-btn:hover {
  color: var(--colors-ink);
}

.switcher-btn.active {
  color: var(--colors-on-primary);
  background-color: var(--colors-primary);
  box-shadow: 0 2px 8px rgba(204, 120, 92, 0.35);
}

.course-view {
  animation: courseFadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes courseFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Specific Cards for Video Course */
.copyright-warning-box {
  background-color: #2b1f1a;
  border: 1px solid #7a3e2b;
  border-radius: var(--rounded-lg);
  padding: 24px 28px;
  color: #f7e6e1;
  margin-bottom: 32px;
}

.copyright-warning-box h4 {
  color: #ff9d7d;
  font-size: 18px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.copyright-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 16px;
}

.copyright-card {
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid rgba(247, 230, 225, 0.12);
  padding: 16px;
  border-radius: var(--rounded-md);
}

.copyright-card strong {
  color: #ffb8a1;
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
}

.copyright-card p {
  font-size: 13px;
  line-height: 1.5;
  color: #e5cfc8;
}

.skill-info-card {
  background-color: var(--colors-surface-card);
  border: 1px solid var(--colors-hairline);
  border-radius: var(--rounded-lg);
  padding: 22px 26px;
  margin-bottom: 24px;
}