/* =============================================================
   Claude Code Course — Design System
   components.css: Layout, Navigation, Cards, Controls
   ============================================================= */

/* ---------------------------------------------------------------
   Layout — App Shell
--------------------------------------------------------------- */
.app-shell {
  display: flex;
  min-height: 100vh;
}

/* ---------------------------------------------------------------
   Sidebar
--------------------------------------------------------------- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: var(--z-sidebar);
  transition:
    transform var(--transition-med),
    background-color var(--transition-med),
    border-color var(--transition-med);
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ---------------------------------------------------------------
   Sidebar Logo
--------------------------------------------------------------- */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  padding: 1.25rem 1rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  text-decoration: none;
}

.sidebar-logo:hover {
  text-decoration: none;
}

.sidebar-logo-icon {
  width: 32px;
  height: 32px;
  background-color: var(--accent);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1rem;
  color: #fff;
  font-weight: 700;
  font-family: inherit;
}

.sidebar-logo-text {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.sidebar-logo-title {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.2;
}

.sidebar-logo-subtitle {
  font-size: 0.6875rem;
  color: var(--text-muted);
  font-family: "JetBrains Mono", "Fira Code", monospace;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ---------------------------------------------------------------
   Sidebar Progress Section
--------------------------------------------------------------- */
.sidebar-progress {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-progress-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.375rem;
}

/* ---------------------------------------------------------------
   Sidebar Navigation
--------------------------------------------------------------- */
.sidebar-nav {
  flex: 1;
  padding: 0.5rem 0;
  overflow-y: auto;
}

.nav-section {
  margin-bottom: 0.25rem;
}

.nav-section-title {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0.75rem 1rem 0.25rem;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 0;
  transition:
    background-color var(--transition),
    color var(--transition);
  position: relative;
  line-height: 1.4;
}

.nav-link:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  text-decoration: none;
}

html.light .nav-link:hover {
  background-color: rgba(0, 0, 0, 0.04);
}

.nav-link.active {
  background-color: rgba(247, 129, 102, 0.12);
  color: var(--accent);
  font-weight: 500;
}

.nav-link.active::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--accent);
  border-radius: 0 2px 2px 0;
}

.nav-link.done {
  color: var(--text-muted);
}

.nav-link.done::after {
  content: "✓";
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--success);
  flex-shrink: 0;
}

.nav-link-icon {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.7;
}

.nav-link-number {
  font-size: 0.6875rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--text-muted);
  min-width: 1.25rem;
  flex-shrink: 0;
}

/* ---------------------------------------------------------------
   Sidebar Footer
--------------------------------------------------------------- */
.sidebar-footer {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

/* ---------------------------------------------------------------
   Main Content Area
--------------------------------------------------------------- */
.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  transition: margin-left var(--transition-med);
}

.content-header {
  position: sticky;
  top: 0;
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  z-index: 10;
  padding: 0 1.5rem;
  height: 52px;
  display: flex;
  align-items: center;
  gap: 1rem;
  transition:
    background-color var(--transition-med),
    border-color var(--transition-med);
}

.content-body {
  flex: 1;
  padding: 2rem 1.5rem;
}

/* ---------------------------------------------------------------
   Breadcrumb
--------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.breadcrumb-item {
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.breadcrumb-item a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition);
}

.breadcrumb-item a:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.breadcrumb-sep {
  color: var(--text-muted);
  flex-shrink: 0;
  font-size: 0.75rem;
}

.breadcrumb-item.current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ---------------------------------------------------------------
   Progress Bar
--------------------------------------------------------------- */
.progress-bar-container {
  width: 100%;
  height: 6px;
  background-color: var(--border);
  border-radius: 9999px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 9999px;
  transition: width 600ms cubic-bezier(0.4, 0, 0.2, 1);
  min-width: 0;
}

.progress-text {
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-family: "JetBrains Mono", monospace;
}

.progress-text strong {
  color: var(--accent);
}

/* ---------------------------------------------------------------
   Homepage Grid
--------------------------------------------------------------- */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
  padding: 1.5rem 0;
}

/* ---------------------------------------------------------------
   Card
--------------------------------------------------------------- */
.card {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition:
    transform var(--transition-med),
    box-shadow var(--transition-med),
    border-color var(--transition-med);
  cursor: pointer;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
  text-decoration: none;
  color: inherit;
}

.card.completed {
  opacity: 0.7;
  border-left: 3px solid var(--success);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}

.card-number {
  font-size: 0.6875rem;
  font-family: "JetBrains Mono", monospace;
  color: var(--text-muted);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.125rem 0.375rem;
  flex-shrink: 0;
}

.card-status-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.card-description {
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}

/* ---------------------------------------------------------------
   Module Header
--------------------------------------------------------------- */
.module-header {
  padding: 2rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.module-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 0.75rem;
}

.module-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ---------------------------------------------------------------
   Search
--------------------------------------------------------------- */
.search-container {
  position: relative;
  flex: 1;
  max-width: 480px;
}

.search-input {
  width: 100%;
  height: 36px;
  padding: 0 0.75rem 0 2.25rem;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.875rem;
  font-family: inherit;
  transition:
    border-color var(--transition),
    box-shadow var(--transition),
    background-color var(--transition-med);
  outline: none;
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(247, 129, 102, 0.15);
  background-color: var(--bg-primary);
}

.search-icon {
  position: absolute;
  left: 0.625rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  width: 16px;
  height: 16px;
}

.search-results {
  position: absolute;
  top: calc(100% + 0.375rem);
  left: 0;
  right: 0;
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-tooltip);
  max-height: 400px;
  overflow-y: auto;
  display: none;
}

.search-results.open {
  display: block;
}

.search-results-header {
  padding: 0.5rem 0.75rem;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.75rem;
  cursor: pointer;
  transition: background-color var(--transition);
  text-decoration: none;
  color: inherit;
}

.search-result-item:hover,
.search-result-item.focused {
  background-color: rgba(247, 129, 102, 0.08);
  text-decoration: none;
  color: inherit;
}

.search-result-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  flex-shrink: 0;
}

.search-result-text {
  flex: 1;
  min-width: 0;
}

.search-result-title {
  font-size: 0.875rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.search-no-results {
  padding: 1.25rem 0.75rem;
  text-align: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ---------------------------------------------------------------
   Theme Toggle
--------------------------------------------------------------- */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--text-muted);
}

.theme-toggle[aria-label="Switch to light mode"] .icon-moon { display: block; }
.theme-toggle[aria-label="Switch to light mode"] .icon-sun  { display: none; }
.theme-toggle[aria-label="Switch to dark mode"]  .icon-moon { display: none; }
.theme-toggle[aria-label="Switch to dark mode"]  .icon-sun  { display: block; }

/* ---------------------------------------------------------------
   Buttons — Base
--------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  cursor: pointer;
  text-decoration: none;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition),
    transform var(--transition);
  white-space: nowrap;
  line-height: 1;
  user-select: none;
}

.btn:hover {
  background-color: var(--bg-card);
  border-color: var(--text-muted);
  text-decoration: none;
  color: var(--text-primary);
}

.btn:active {
  transform: translateY(1px);
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------------------------------------------------------------
   Buttons — Variants
--------------------------------------------------------------- */
.btn-primary {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #ffffff;
}

.btn-ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--text-secondary);
}

.btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.06);
  border-color: transparent;
  color: var(--text-primary);
}

html.light .btn-ghost:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.btn-sm {
  padding: 0.3125rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-lg {
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  border-radius: var(--radius-lg);
}

/* ---------------------------------------------------------------
   Button — Complete Module
--------------------------------------------------------------- */
.btn-complete {
  background-color: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  gap: 0.5rem;
}


.btn-complete:hover {
  border-color: var(--success);
  color: var(--success);
  background-color: rgba(63, 185, 80, 0.08);
}

.btn-complete.completed {
  background-color: rgba(63, 185, 80, 0.12);
  border-color: var(--success);
  color: var(--success);
  font-weight: 500;
}


/* ---------------------------------------------------------------
   Button — Next Module
--------------------------------------------------------------- */
.btn-next {
  background-color: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
  font-weight: 600;
}

.btn-next:hover {
  background-color: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #ffffff;
}


/* ---------------------------------------------------------------
   Badge
--------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.125rem 0.5rem;
  font-size: 0.6875rem;
  font-weight: 500;
  border-radius: 9999px;
  border: 1px solid transparent;
  white-space: nowrap;
  line-height: 1.5;
}

.badge-default {
  background-color: var(--bg-secondary);
  border-color: var(--border);
  color: var(--text-secondary);
}

.badge-accent {
  background-color: rgba(247, 129, 102, 0.15);
  border-color: rgba(247, 129, 102, 0.3);
  color: var(--accent);
}

.badge-success {
  background-color: rgba(63, 185, 80, 0.12);
  border-color: rgba(63, 185, 80, 0.3);
  color: var(--success);
}

.badge-warning {
  background-color: rgba(210, 153, 34, 0.12);
  border-color: rgba(210, 153, 34, 0.3);
  color: var(--warning);
}

.badge-info {
  background-color: rgba(88, 166, 255, 0.12);
  border-color: rgba(88, 166, 255, 0.3);
  color: var(--info);
}

/* Difficulty-specific */
.badge-beginner  { background-color: rgba(63, 185, 80, 0.1);  border-color: rgba(63, 185, 80, 0.25);   color: var(--success); }
.badge-intermediate { background-color: rgba(210, 153, 34, 0.1); border-color: rgba(210, 153, 34, 0.25); color: var(--warning); }
.badge-advanced  { background-color: rgba(167, 139, 250, 0.1); border-color: rgba(167, 139, 250, 0.25); color: #a78bfa; }

/* ---------------------------------------------------------------
   Tag
--------------------------------------------------------------- */
.tag {
  display: inline-flex;
  align-items: center;
  padding: 0.125rem 0.5rem;
  font-size: 0.75rem;
  font-family: "JetBrains Mono", monospace;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition);
  cursor: default;
}

.tag:hover,
a.tag:hover {
  background-color: rgba(247, 129, 102, 0.1);
  border-color: rgba(247, 129, 102, 0.3);
  color: var(--accent);
  text-decoration: none;
}

/* ---------------------------------------------------------------
   Hamburger / Mobile Menu Toggle
--------------------------------------------------------------- */
.hamburger {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background-color: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  padding: 0;
  flex-shrink: 0;
}

.hamburger-bar {
  width: 16px;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.open .hamburger-bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.open .hamburger-bar:nth-child(2) {
  opacity: 0;
}

.hamburger.open .hamburger-bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------------------------------------------------------------
   Mobile Overlay
--------------------------------------------------------------- */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.6);
  z-index: calc(var(--z-sidebar) - 1);
  backdrop-filter: blur(2px);
}

/* ---------------------------------------------------------------
   Responsive — Mobile
--------------------------------------------------------------- */
@media (max-width: 767px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .sidebar-overlay.visible {
    display: block;
  }

  .main-content {
    margin-left: 0;
  }

  .hamburger {
    display: flex;
  }

  .modules-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 479px) {
  .content-body {
    padding: 1.25rem 1rem;
  }

  .module-header h1 {
    font-size: 1.375rem;
  }
}

/* ---------------------------------------------------------------
   Responsive — Tablet
--------------------------------------------------------------- */
@media (min-width: 768px) and (max-width: 1023px) {
  :root {
    --sidebar-width: 220px;
  }
}