/* ==========================================================================
   Aplikasi Media Pembelajaran HTML Interaktif - Stylesheet
   Modern, Bersih, Aksesibel, dan Responsif
   ========================================================================== */

:root {
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: #e0f2fe;
  --secondary: #0d9488;
  --accent: #f59e0b;
  --success: #16a34a;
  --success-light: #dcfce7;
  --warning: #ea580c;
  --warning-light: #ffedd5;
  --danger: #dc2626;

  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-sidebar: #0f172a;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --border-color: #e2e8f0;
  --border-focus: #38bdf8;

  --header-height: 60px;
  --toolbar-height: 44px;
  --font-sans: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --font-mono: 'Cascadia Code', 'Fira Code', Consolas, Monaco, 'Courier New', monospace;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

html, body {
  height: 100%;
  min-height: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ==========================================================================
   Header Navbar
   ========================================================================== */
.app-header {
  height: var(--header-height);
  background-color: #0f172a;
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid #1e293b;
  z-index: 20;
  flex-shrink: 0;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, #38bdf8 0%, #0284c7 100%);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  box-shadow: 0 2px 8px rgba(2, 132, 199, 0.4);
}

.brand-title {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: #ffffff;
}

.brand-badge {
  font-size: 11px;
  background-color: rgba(56, 189, 248, 0.2);
  color: #38bdf8;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid rgba(56, 189, 248, 0.3);
  font-weight: 600;
}

/* Header Navigation & Actions */
.header-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.main-nav-tab {
  background: transparent;
  color: #94a3b8;
  border: none;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s;
}

.main-nav-tab:hover {
  background-color: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

.main-nav-tab.active {
  background-color: #0284c7;
  color: #ffffff;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-header {
  background-color: #1e293b;
  color: #f1f5f9;
  border: 1px solid #334155;
  padding: 7px 13px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn-header:hover {
  background-color: #334155;
  border-color: #475569;
  color: #ffffff;
}

.btn-header-primary {
  background-color: #0284c7;
  border-color: #0284c7;
  color: #ffffff;
}

.btn-header-primary:hover {
  background-color: #0369a1;
  border-color: #0369a1;
}

/* ==========================================================================
   Main App Container (Sidebar + Workspaces)
   ========================================================================== */
.app-container {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

/* ==========================================================================
   Sidebar: Materi & Tantangan
   ========================================================================== */
.app-sidebar {
  width: 320px;
  background-color: #ffffff;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  z-index: 10;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-tab-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.sidebar-section-title {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  font-weight: 700;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Modul Card */
.modules-container {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.module-card {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 14px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 12px;
  transition: all 0.2s ease;
}

.module-card:hover {
  background-color: #ffffff;
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.module-icon {
  font-size: 22px;
  width: 36px;
  height: 36px;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.module-info {
  flex: 1;
  min-width: 0;
}

.module-title {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.module-desc {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-module-open {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  padding: 4px;
  transition: color 0.15s;
}

.module-card:hover .btn-module-open {
  color: var(--primary);
}

/* Tantangan Card */
.challenges-container {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.challenge-card {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}

.challenge-card:hover {
  border-color: #38bdf8;
  box-shadow: var(--shadow-md);
}

.challenge-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

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

.challenge-head-text {
  flex: 1;
}

.difficulty-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 4px;
  text-transform: uppercase;
}

.diff-mudah {
  background-color: #dcfce7;
  color: #15803d;
}

.diff-menengah {
  background-color: #fef3c7;
  color: #b45309;
}

.challenge-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
  margin-top: 2px;
}

.challenge-instruction {
  font-size: 12.5px;
  color: var(--text-main);
  line-height: 1.5;
  margin-bottom: 12px;
  background-color: #f8fafc;
  padding: 8px 10px;
  border-radius: 6px;
  border-left: 3px solid var(--primary);
}

.challenge-actions {
  display: flex;
  gap: 8px;
}

.btn-outline-sm {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 10px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}

.btn-outline-sm:hover {
  background-color: #f1f5f9;
}

.btn-primary-sm {
  background-color: var(--primary);
  border: 1px solid var(--primary);
  color: #ffffff;
  padding: 6px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  flex: 1;
}

.btn-primary-sm:hover {
  background-color: var(--primary-hover);
}

.challenge-feedback {
  margin-top: 10px;
  font-size: 12.5px;
  display: none;
}

.alert-success {
  background-color: var(--success-light);
  color: #14532d;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid #86efac;
}

.alert-warning {
  background-color: var(--warning-light);
  color: #7c2d12;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid #fdba74;
}

.hint-text {
  margin-top: 5px;
  font-size: 11.5px;
  color: #9a3412;
}

/* ==========================================================================
   Workspace (Dual-Pane: Editor & Preview)
   ========================================================================== */
.workspace-container {
  flex: 1;
  display: flex;
  overflow: hidden;
  position: relative;
  background-color: var(--bg-main);
}

/* Split Panes */
.pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: 100%;
}

.editor-pane {
  width: 50%;
  border-right: 1px solid var(--border-color);
  background-color: #ffffff;
}

.preview-pane {
  width: 50%;
  background-color: #f1f5f9;
}

/* Drag Resizer */
.workspace-resizer {
  width: 7px;
  background-color: transparent;
  cursor: col-resize;
  position: relative;
  z-index: 15;
  transition: background-color 0.15s;
  flex-shrink: 0;
}

.workspace-resizer::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 3px;
  height: 36px;
  background-color: #cbd5e1;
  border-radius: 3px;
}

.workspace-resizer:hover,
.workspace-resizer:active {
  background-color: var(--primary);
}

.workspace-resizer:hover::after {
  background-color: #ffffff;
}

/* Pane Headers & Toolbars */
.pane-header {
  height: var(--toolbar-height);
  background-color: #f8fafc;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  flex-shrink: 0;
}

.pane-title-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.pane-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 6px;
}

.status-pill {
  font-size: 11px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 12px;
}

.status-success {
  background-color: #dcfce7;
  color: #15803d;
}

.status-warning {
  background-color: #ffedd5;
  color: #c2410c;
}

.status-info {
  background-color: #e0f2fe;
  color: #0369a1;
}

.pane-counters {
  font-size: 11.5px;
  color: var(--text-muted);
  display: flex;
  gap: 12px;
}

/* Quick Tag Inserter Toolbar */
.quick-tag-bar {
  background-color: #f1f5f9;
  border-bottom: 1px solid var(--border-color);
  padding: 5px 12px;
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  flex-shrink: 0;
}

.quick-tag-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.3px;
  white-space: nowrap;
  margin-right: 4px;
}

.tag-chip {
  background-color: #ffffff;
  border: 1px solid #cbd5e1;
  color: #0369a1;
  font-family: var(--font-mono);
  font-size: 11.5px;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  user-select: none;
}

.tag-chip:hover {
  background-color: #e0f2fe;
  border-color: #38bdf8;
  color: #0284c7;
}

/* Code Editor Wrapper */
.editor-wrapper {
  flex: 1;
  position: relative;
  overflow: hidden;
}

.editor-wrapper textarea {
  width: 100%;
  height: 100%;
  border: none;
  outline: none;
  resize: none;
  font-family: var(--font-mono);
  font-size: 14px;
  padding: 16px;
  line-height: 1.5;
  background-color: #1e1e2e;
  color: #f8fafc;
  box-sizing: border-box;
}

/* CodeMirror Full-height Override */
.CodeMirror {
  height: 100% !important;
  font-family: var(--font-mono) !important;
  font-size: 14px !important;
  line-height: 1.55 !important;
}

.cm-s-dracula.CodeMirror {
  background-color: #1e1e2e !important;
}

/* ==========================================================================
   Preview Area & Device Simulation
   ========================================================================== */
.viewport-switcher {
  display: flex;
  align-items: center;
  gap: 4px;
  background-color: #e2e8f0;
  padding: 2px;
  border-radius: 6px;
}

.viewport-btn {
  background: transparent;
  border: none;
  font-size: 13px;
  padding: 3px 8px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-muted);
  transition: all 0.15s;
}

.viewport-btn.active {
  background-color: #ffffff;
  color: var(--text-main);
  box-shadow: var(--shadow-sm);
}

.btn-icon-text {
  background: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 5px;
}

.btn-icon-text:hover {
  background-color: #f8fafc;
}

.preview-container {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  padding: 16px;
  background-color: #cbd5e1;
  transition: all 0.3s;
}

.preview-wrapper {
  width: 100%;
  height: 100%;
  background-color: #ffffff;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: width 0.3s ease, height 0.3s ease;
  position: relative;
}

.preview-wrapper iframe {
  width: 100%;
  height: 100%;
  border: none;
  background-color: #ffffff;
  display: block;
}

/* Responsive Viewports */
.preview-wrapper.mode-desktop {
  width: 100%;
  height: 100%;
}

.preview-wrapper.mode-tablet {
  width: 768px;
  height: 95%;
  border: 10px solid #1e293b;
  border-radius: 20px;
}

.preview-wrapper.mode-mobile {
  width: 375px;
  height: 95%;
  border: 12px solid #1e293b;
  border-radius: 28px;
}

/* Fullscreen Mode */
.preview-container.is-fullscreen {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1000;
  padding: 0;
  background-color: #ffffff;
}

.preview-container.is-fullscreen .preview-wrapper {
  border-radius: 0;
  box-shadow: none;
}

/* ==========================================================================
   Modals (Materi Detail & Kamus Tag)
   ========================================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background-color: #ffffff;
  width: 90%;
  max-width: 680px;
  max-height: 85vh;
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: translateY(20px);
  transition: transform 0.25s ease;
}

.modal-backdrop.active .modal-card {
  transform: translateY(0);
}

.modal-card-lg {
  max-width: 850px;
}

.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 10px;
}

.modal-close-btn {
  background: transparent;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: background-color 0.15s;
}

.modal-close-btn:hover {
  background-color: #f1f5f9;
  color: var(--danger);
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  line-height: 1.6;
}

.modal-footer {
  padding: 14px 24px;
  border-top: 1px solid var(--border-color);
  background-color: #f8fafc;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

/* Modul Detail Typography & Content */
.module-detail-content h4 {
  font-size: 15px;
  margin-top: 16px;
  margin-bottom: 8px;
  color: var(--primary-hover);
}

.module-detail-content h4:first-child {
  margin-top: 0;
}

.module-detail-content p {
  font-size: 14px;
  color: #334155;
  margin-bottom: 12px;
}

.module-detail-content ul,
.module-detail-content ol {
  padding-left: 20px;
  margin-bottom: 14px;
  font-size: 14px;
  color: #334155;
}

.module-detail-content li {
  margin-bottom: 6px;
}

.code-explain {
  background-color: #0f172a;
  color: #38bdf8;
  padding: 10px 14px;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  margin-bottom: 12px;
}

.sample-code-box {
  margin-top: 20px;
  background-color: #1e293b;
  border-radius: 10px;
  padding: 16px;
  color: #f8fafc;
}

.sample-code-box h5 {
  font-size: 13px;
  color: #94a3b8;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.sample-code-box pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  overflow-x: auto;
  line-height: 1.5;
  color: #a5f3fc;
}

/* Kamus Tag Modal Table */
.tag-dict-controls {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.dict-search-input {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 14px;
  outline: none;
}

.dict-search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
}

.cat-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.cat-filter-btn {
  background-color: #f1f5f9;
  border: 1px solid var(--border-color);
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--text-muted);
}

.cat-filter-btn.active {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
}

.tag-table-wrapper {
  max-height: 400px;
  overflow-y: auto;
  border: 1px solid var(--border-color);
  border-radius: 8px;
}

.tag-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

.tag-table th {
  background-color: #f8fafc;
  padding: 10px 14px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  font-weight: 700;
  color: var(--text-muted);
  position: sticky;
  top: 0;
  z-index: 5;
}

.tag-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border-color);
  vertical-align: middle;
}

.tag-table tr:hover {
  background-color: #f8fafc;
}

.tag-code {
  font-family: var(--font-mono);
  background-color: #e0f2fe;
  color: #0369a1;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.badge-cat {
  font-size: 11px;
  background-color: #f1f5f9;
  color: #475569;
  padding: 3px 8px;
  border-radius: 4px;
  font-weight: 600;
}

.btn-insert-sm {
  background-color: #0284c7;
  color: white;
  border: none;
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 11.5px;
  font-weight: 600;
  cursor: pointer;
}

.btn-insert-sm:hover {
  background-color: #0369a1;
}

/* ==========================================================================
   Toast Notification Pill
   ========================================================================== */
.toast-pill {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(50px);
  background-color: #0f172a;
  color: #ffffff;
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 13.5px;
  font-weight: 600;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 500;
}

.toast-pill.active {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast-success {
  background-color: #15803d;
}

.toast-warning {
  background-color: #c2410c;
}

.toast-info {
  background-color: #0284c7;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
  .app-sidebar {
    width: 270px;
  }
}

@media (max-width: 840px) {
  .app-sidebar {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    z-index: 50;
    display: none;
  }

  .editor-pane {
    width: 100% !important;
  }

  .preview-pane {
    display: none;
  }

  .workspace-resizer {
    display: none;
  }
}