/* ==========================================================================
   PyBelajar - W3Schools Clean Design System
   Mendukung Tema Terang (Default) & Gelap, Bebas Efek Neon, dan Responsif Penuh
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* ==================== TEMA TERANG (DEFAULT W3SCHOOLS) ==================== */
:root, [data-theme="light"] {
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Latar Belakang Bersih & Terang */
  --bg-page: #f8fafc;
  --bg-surface: #ffffff;
  --bg-subtle: #f1f5f9;
  --bg-hover: #e2e8f0;
  --bg-active: #cbd5e1;

  /* Garis Batas Halus */
  --border-subtle: #e2e8f0;
  --border-medium: #cbd5e1;
  --border-dark: #94a3b8;

  /* Warna Teks Berkontras Tinggi */
  --text-main: #0f172a;
  --text-muted: #334155;
  --text-subtle: #64748b;

  /* Aksen Klasik W3Schools (Tanpa Efek Neon) */
  --w3-green: #04aa6d;
  --w3-green-hover: #038a58;
  --w3-green-light: #e8f5e9;
  --primary-blue: #0284c7;
  --danger: #dc2626;
  --warning-bg: #fef9c3;
  --warning-border: #facc15;
  --warning-text: #713f12;

  --code-bg: #f8fafc;
  --code-border: #e2e8f0;
  --code-text: #0f172a;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 2px 6px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 6px 18px rgba(0, 0, 0, 0.12);
}

/* ==================== TEMA GELAP (ELEGAN & BERSIH, TANPA NEON) ==================== */
[data-theme="dark"] {
  --bg-page: #0b1120;
  --bg-surface: #131c31;
  --bg-subtle: #1a253c;
  --bg-hover: #24324f;
  --bg-active: #2e3e60;

  --border-subtle: #1e293b;
  --border-medium: #334155;
  --border-dark: #475569;

  --text-main: #f8fafc;
  --text-muted: #cbd5e1;
  --text-subtle: #94a3b8;

  --w3-green: #04aa6d;
  --w3-green-hover: #059862;
  --w3-green-light: rgba(4, 170, 109, 0.15);
  --primary-blue: #38bdf8;
  --danger: #ef4444;
  --warning-bg: rgba(251, 191, 36, 0.1);
  --warning-border: #ca8a04;
  --warning-text: #fef08a;

  --code-bg: #090e1a;
  --code-border: #1e293b;
  --code-text: #f8fafc;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.6);
}

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

html {
  scroll-behavior: smooth;
  max-width: 100vw;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-y: auto; /* Bisa scroll ke bawah secara alami */
  max-width: 100vw;
  overflow-x: hidden;
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-page);
}
::-webkit-scrollbar-thumb {
  background: var(--border-medium);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-subtle);
}

/* ==================== TOP NAVIGATION BAR ==================== */
.navbar {
  height: 64px;
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: var(--shadow-sm);
}

.nav-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.btn-mobile-hamburger {
  display: none;
  background: transparent;
  border: 1px solid var(--border-medium);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-main);
}

.brand-icon {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--w3-green);
  border-radius: var(--radius-sm);
  color: #fff;
}

.brand-text span {
  color: var(--w3-green);
  font-weight: 800;
}

.brand-badge {
  font-size: 0.65rem;
  background: var(--w3-green);
  color: #fff;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-weight: 700;
}

.nav-mode-switcher {
  display: flex;
  background: var(--bg-subtle);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-subtle);
  gap: 2px;
}

.nav-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.nav-tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-hover);
}

.nav-tab-btn.active {
  background: var(--w3-green);
  color: #fff;
}

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

.stats-pill-group {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
}

.xp-badge {
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--w3-green);
}

.progress-overview {
  display: flex;
  align-items: center;
  gap: 8px;
}

.global-bar-bg {
  width: 80px;
  height: 6px;
  background: var(--border-medium);
  border-radius: 99px;
  overflow: hidden;
}

.global-bar-fill {
  height: 100%;
  width: 0%;
  background: var(--w3-green);
  transition: width 0.3s ease;
}

.global-percent-text {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
}

.user-rank {
  font-size: 0.75rem;
  font-weight: 700;
  background: var(--w3-green-light);
  color: var(--w3-green);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
}

/* ==================== BUTTONS ==================== */
.btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  user-select: none;
}

.btn-primary {
  background: var(--w3-green);
  color: #fff;
}
.btn-primary:hover {
  background: var(--w3-green-hover);
}

.btn-success {
  background: var(--w3-green);
  color: #fff;
}
.btn-success:hover {
  background: var(--w3-green-hover);
}

.btn-secondary {
  background: var(--bg-subtle);
  color: var(--text-main);
  border-color: var(--border-medium);
}
.btn-secondary:hover {
  background: var(--bg-hover);
}

.btn-ghost-sm {
  background: transparent;
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 4px 8px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.btn-ghost-sm:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

.btn-secondary-sm {
  background: var(--bg-subtle);
  color: var(--text-main);
  font-size: 0.8rem;
  padding: 6px 12px;
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.btn-secondary-sm:hover {
  background: var(--bg-hover);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s;
}
.btn-icon:hover {
  background: var(--bg-hover);
  color: var(--text-main);
}

/* ==================== MAIN WORKSPACE LAYOUT ==================== */
.main-wrapper {
  flex: 1;
  display: flex;
  min-height: calc(100vh - 64px);
  position: relative;
  max-width: 100vw;
  min-width: 0;
  overflow-x: hidden;
}

/* Backdrop untuk Mobile Sidebar */
.sidebar-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 150;
}

/* ==================== SIDEBAR ==================== */
.sidebar {
  width: 260px;
  min-width: 240px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
  flex-shrink: 0;
  z-index: 160;
  transition: transform 0.25s ease;
}

.sidebar-header {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
  position: sticky;
  top: 0;
  background: var(--bg-surface);
  z-index: 10;
}

.sidebar-title {
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 8px;
}

.search-box {
  position: relative;
  width: 100%;
}

.search-box input {
  width: 100%;
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  padding: 8px 12px 8px 32px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.82rem;
  outline: none;
}
.search-box input:focus {
  border-color: var(--w3-green);
  background: var(--bg-surface);
}

.search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-subtle);
  pointer-events: none;
}

.modules-list {
  flex: 1;
  padding: 8px 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.w3-sidebar-group {
  display: flex;
  flex-direction: column;
}

.w3-sidebar-group-header {
  padding: 10px 18px 4px 18px;
  font-size: 0.76rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-subtle);
}

.w3-sidebar-items {
  display: flex;
  flex-direction: column;
}

.w3-topic-btn {
  background: transparent;
  border: none;
  padding: 7px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  width: 100%;
}

.w3-topic-btn:hover {
  background: var(--bg-subtle);
  color: var(--text-main);
}

.w3-topic-btn.active {
  background: var(--w3-green) !important;
  color: #fff !important;
  font-weight: 700;
}

.w3-check-icon {
  font-weight: 800;
  color: var(--w3-green);
  font-size: 0.85rem;
}
.w3-topic-btn.active .w3-check-icon {
  color: #fff;
}

/* ==================== WORKSPACE (SPLIT & RESPONSIVE) ==================== */
.workspace-container {
  flex: 1;
  display: flex;
  min-width: 0;
  background: var(--bg-page);
}

/* CONTENT PANEL */
.lesson-content-panel {
  flex: 1;
  min-width: 0;
  max-width: 100%;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
}

.panel-header {
  padding: 14px 24px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--bg-surface);
  position: sticky;
  top: 64px;
  z-index: 50;
  min-width: 0;
  max-width: 100%;
}

.breadcrumb-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--text-subtle);
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.breadcrumb-sep {
  opacity: 0.5;
}

#breadcrumb-lesson {
  color: var(--w3-green);
  font-weight: 700;
}

.tabs-row {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  flex-wrap: nowrap;
}
.tabs-row::-webkit-scrollbar {
  display: none;
}

.tab-btn-mobile-editor {
  display: none;
}

.tab-btn {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-sans);
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: all 0.15s;
}

.tab-btn:hover {
  color: var(--text-main);
  background: var(--bg-hover);
}

.tab-btn.active {
  background: var(--w3-green);
  color: #fff;
  border-color: var(--w3-green);
}

.tab-badge {
  font-size: 0.7rem;
  padding: 1px 6px;
  border-radius: var(--radius-sm);
  background: rgba(0, 0, 0, 0.15);
  color: #fff;
  font-weight: 700;
}

.panel-body {
  padding: 24px 30px;
  flex: 1;
}

/* ==================== W3 TUTORIAL CONTENT ==================== */
.w3-tutorial-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 820px;
  width: 100%;
  min-width: 0;
}

.w3-tutorial-content h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.5px;
  word-break: break-word;
}

.w3-tutorial-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-main);
  margin-top: 14px;
  word-break: break-word;
}

.w3-tutorial-content p {
  font-size: 0.98rem;
  word-break: break-word;
}

.w3-hr {
  border: none;
  border-top: 1px solid var(--border-subtle);
  margin: 8px 0 14px 0;
}

.w3-nav-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 6px 0 14px 0;
  gap: 8px;
}

.w3-bottom-nav {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border-subtle);
}

.w3-nav-btn {
  background: var(--w3-green);
  color: #fff;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 700;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.w3-nav-btn:hover:not(:disabled) {
  background: var(--w3-green-hover);
}

.w3-nav-btn:disabled {
  background: var(--border-medium);
  color: var(--text-subtle);
  cursor: not-allowed;
}

.w3-list {
  padding-left: 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.95rem;
  word-break: break-word;
}

/* W3 Example Box */
.w3-example-box {
  background: var(--code-bg);
  border: 1px solid var(--border-medium);
  border-left: 5px solid var(--w3-green);
  border-radius: var(--radius-sm);
  padding: 18px;
  margin: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 100%;
  max-width: 100%;
  min-width: 0;
}

.w3-example-box h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-main);
  word-break: break-word;
}

.w3-example-box pre {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 14px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
}

.w3-example-box code {
  font-family: var(--font-mono);
  color: var(--code-text);
  font-size: 0.88rem;
}

.w3-try-btn {
  background: var(--w3-green);
  color: #fff;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.88rem;
  font-weight: 700;
  padding: 9px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  align-self: flex-start;
  transition: all 0.15s;
}

.w3-try-btn:hover {
  background: var(--w3-green-hover);
}

/* W3 Exercise Banner */
.w3-exercise-banner {
  background: var(--bg-subtle);
  border: 1px solid var(--border-medium);
  border-left: 5px solid var(--w3-green);
  border-radius: var(--radius-sm);
  padding: 20px;
  margin: 20px 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.w3-exercise-badge {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: var(--w3-green);
}

.w3-exercise-banner h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
}

/* W3 Table */
.w3-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  margin: 14px 0;
}

.w3-table th, .w3-table td {
  padding: 10px 14px;
  border: 1px solid var(--border-subtle);
  text-align: left;
}

.w3-table th {
  background: var(--bg-subtle);
  color: var(--text-main);
  font-weight: 700;
}

.w3-table td code {
  font-family: var(--font-mono);
  color: var(--primary-blue);
  background: var(--bg-subtle);
  padding: 2px 6px;
  border-radius: 4px;
}

.w3-info-card {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.92rem;
}

.w3-warning {
  background: var(--warning-bg);
  border-left: 4px solid var(--warning-border);
  color: var(--warning-text);
}

/* ==================== RIGHT: EDITOR PANEL ==================== */
.editor-panel {
  width: 46%;
  min-width: 380px;
  display: flex;
  flex-direction: column;
  background: var(--bg-surface);
  border-left: 1px solid var(--border-subtle);
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}

.editor-header-bar {
  height: 48px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
  position: sticky;
  top: 0;
  z-index: 40;
}

.editor-file-tab {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-surface);
  border-top: 2px solid var(--w3-green);
  padding: 8px 14px;
  height: 100%;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-main);
  font-weight: 600;
}

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

.editor-workspace-wrap {
  height: 380px;
  min-height: 320px;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border-subtle);
}

/* ==================== TERMINAL PANEL ==================== */
.terminal-panel {
  min-height: 220px;
  background: var(--code-bg);
  display: flex;
  flex-direction: column;
}

.terminal-header {
  height: 40px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
}

.terminal-tabs {
  display: flex;
  align-items: center;
  gap: 4px;
}

.term-tab-btn {
  background: transparent;
  border: none;
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-subtle);
  padding: 5px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.term-tab-btn:hover {
  color: var(--text-main);
}

.term-tab-btn.active {
  color: var(--w3-green);
  background: var(--w3-green-light);
  font-weight: 700;
}

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

.exec-time-pill {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.terminal-body {
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-y: auto;
  max-height: 260px;
}

.terminal-raw-output {
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--code-text);
}

/* Test results */
.test-header-status {
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 10px;
}

.test-status-pass {
  background: var(--w3-green-light);
  color: var(--w3-green);
  border: 1px solid var(--w3-green);
}

.test-status-fail {
  background: rgba(220, 38, 38, 0.1);
  color: var(--danger);
  border: 1px solid var(--danger);
}

.test-items-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.test-item-card {
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
}

.test-item-card.test-pass {
  border-left: 4px solid var(--w3-green);
}

.test-item-card.test-fail {
  border-left: 4px solid var(--danger);
}

.test-item-title {
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 2px;
}

.test-item-msg {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.next-lesson-prompt {
  margin-top: 14px;
  text-align: right;
}

/* ==================== CHALLENGE CARD ==================== */
.challenge-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 820px;
}

.challenge-top-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.badge-challenge-tag {
  font-size: 0.72rem;
  font-weight: 800;
  background: var(--w3-green-light);
  color: var(--w3-green);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.badge-reward {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--w3-green);
}

.badge-solved {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--w3-green);
  background: var(--w3-green-light);
  padding: 3px 8px;
  border-radius: var(--radius-sm);
}

.challenge-heading {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
}

.challenge-instructions {
  background: var(--bg-subtle);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 0.95rem;
  line-height: 1.7;
}

.challenge-hints-accordion {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--bg-subtle);
}

.hint-header-toggle {
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
}

.hint-body-content {
  padding: 14px;
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}

.hint-list {
  padding-left: 20px;
  font-size: 0.88rem;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

.solution-box {
  margin-top: 10px;
  background: var(--code-bg);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: 12px;
}

/* ==================== QUIZ STYLES ==================== */
.quiz-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 820px;
}

.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-tag {
  font-size: 0.72rem;
  font-weight: 800;
  background: var(--w3-green-light);
  color: var(--w3-green);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.quiz-reward {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--w3-green);
}

.quiz-question {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.5;
  white-space: pre-line;
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quiz-option-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  text-align: left;
  transition: all 0.15s ease;
}

.quiz-option-btn:hover:not(:disabled) {
  border-color: var(--w3-green);
  background: var(--bg-subtle);
}

.opt-letter {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-medium);
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.quiz-option-btn.correct-answer {
  background: var(--w3-green-light) !important;
  border-color: var(--w3-green) !important;
  color: var(--w3-green) !important;
  font-weight: 600;
}
.quiz-option-btn.correct-answer .opt-letter {
  background: var(--w3-green);
  color: #fff;
  border-color: var(--w3-green);
}

.quiz-option-btn.wrong-answer {
  background: rgba(220, 38, 38, 0.1) !important;
  border-color: var(--danger) !important;
  color: var(--danger) !important;
}
.quiz-option-btn.wrong-answer .opt-letter {
  background: var(--danger);
  color: #fff;
  border-color: var(--danger);
}

.quiz-feedback-box {
  padding: 14px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  line-height: 1.5;
}

.feedback-correct {
  background: var(--w3-green-light);
  border: 1px solid var(--w3-green);
  color: var(--w3-green);
}

.feedback-wrong {
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid var(--danger);
  color: var(--danger);
}

.fb-title {
  font-weight: 700;
  margin-bottom: 4px;
}

/* ==================== MODALS ==================== */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-dialog {
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  max-width: 640px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-badge {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--w3-green);
}

.modal-header h2 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-main);
}

.btn-close-modal {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
}

/* Cheatsheet */
.cs-category-card {
  margin-bottom: 18px;
}
.cs-category-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--w3-green);
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 4px;
}
.cs-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.cs-table td {
  padding: 6px 10px;
  border-bottom: 1px solid var(--border-subtle);
}
.cs-table code {
  color: var(--primary-blue);
  font-family: var(--font-mono);
  background: var(--bg-subtle);
  padding: 2px 4px;
  border-radius: 4px;
}

/* Certificate Modal */
.certificate-dialog {
  max-width: 840px;
}
.cert-card-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.cert-paper {
  background: #ffffff;
  color: #1e293b;
  padding: 18px;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}
.cert-border-outer {
  border: 4px double #04aa6d;
  padding: 6px;
}
.cert-border-inner {
  border: 1px solid #cbd5e1;
  padding: 26px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cert-brand {
  font-weight: 800;
  font-size: 1.1rem;
  color: #04aa6d;
}
.cert-serial {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: #64748b;
  font-weight: 600;
}
.cert-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: 2px;
  color: #0f172a;
}
.cert-subtitle {
  font-size: 0.95rem;
  color: #04aa6d;
  font-weight: 600;
}
.cert-presented-to {
  font-size: 0.9rem;
  color: #64748b;
}
.cert-recipient-name {
  font-size: 2rem;
  font-weight: 800;
  color: #04aa6d;
  border-bottom: 2px solid #04aa6d;
  display: inline-block;
  padding: 0 30px 4px 30px;
  margin: 0 auto;
}
.cert-description {
  font-size: 0.88rem;
  color: #475569;
  max-width: 660px;
  margin: 0 auto;
  line-height: 1.6;
}
.cert-footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-top: 14px;
}
.cert-signature-line {
  border-bottom: 1px solid #94a3b8;
  padding-bottom: 4px;
  font-weight: 700;
  color: #0f172a;
  min-width: 140px;
}
.signature-font {
  font-family: cursive;
  font-size: 1.2rem;
  color: #04aa6d;
}
.cert-sign-title {
  font-size: 0.75rem;
  color: #64748b;
  margin-top: 4px;
}
.cert-seal {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  border: 2px solid #04aa6d;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #04aa6d;
  font-weight: 800;
  font-size: 0.65rem;
  text-align: center;
}
.cert-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Prompt Modal */
.form-control {
  width: 100%;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  outline: none;
}
.form-control:focus {
  border-color: var(--w3-green);
}

.spinner-inline {
  width: 13px;
  height: 13px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.status-pill {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 99px;
}
.status-ready {
  background: var(--w3-green-light);
  color: var(--w3-green);
}
.status-loading {
  background: var(--warning-bg);
  color: var(--warning-text);
}

/* ==================== MEDIA QUERIES (RESPONSIF KE SEMUA DEVICE) ==================== */

/* Tablet & Mobile (< 1024px): Layout Single Column, Fixed Drawer Sidebar, Full-Width Panels */
@media (max-width: 1024px) {
  .workspace-container {
    flex-direction: column;
    width: 100%;
    max-width: 100vw;
    min-width: 0;
  }

  .lesson-content-panel {
    width: 100%;
    max-width: 100vw;
    min-width: 0;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .editor-panel {
    width: 100%;
    max-width: 100vw;
    min-width: 0;
    border-left: none;
    position: static;
    height: auto;
    overflow-y: visible;
  }

  .btn-mobile-hamburger {
    display: inline-flex !important;
  }

  .sidebar {
    position: fixed;
    top: 56px;
    left: 0;
    bottom: 0;
    width: 290px;
    max-width: 85vw;
    height: calc(100vh - 56px);
    transform: translateX(-100%);
    box-shadow: var(--shadow-lg);
    z-index: 250;
    transition: transform 0.25s ease;
  }

  .sidebar.sidebar-open {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 240;
  }

  .sidebar-backdrop.active {
    display: block !important;
  }

  .nav-mode-switcher {
    display: none !important;
  }

  .tab-btn-mobile-editor {
    display: inline-flex !important;
  }
}

/* Smartphone & Layar Kecil (< 768px): Header Kompak, Tombol Minimalis, Bebas Overflow */
@media (max-width: 768px) {
  .navbar {
    height: 56px;
    padding: 0 10px;
    max-width: 100vw;
  }

  .nav-left {
    gap: 8px;
  }

  .brand-logo {
    gap: 6px;
    font-size: 1.1rem;
  }

  .brand-icon {
    width: 30px;
    height: 30px;
  }

  .brand-text {
    font-size: 1.05rem;
  }

  .nav-right {
    gap: 5px;
  }

  /* Sembunyikan label teks tombol navbar di hp agar tidak overflow */
  .nav-text-desktop,
  .btn-nav-compact span:not(.xp-badge) {
    display: none !important;
  }

  .btn-nav-compact {
    padding: 6px !important;
    min-width: 34px !important;
    height: 34px !important;
    border-radius: var(--radius-sm);
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
  }

  .stats-pill-group {
    padding: 4px 8px;
    gap: 4px;
  }

  .stats-pill-group .xp-badge {
    font-size: 0.78rem;
  }

  .stats-pill-group .progress-overview,
  .stats-pill-group .user-rank {
    display: none !important;
  }

  .panel-header {
    padding: 10px 14px;
    top: 56px;
  }

  .breadcrumb-row {
    font-size: 0.76rem;
  }

  .tabs-row {
    gap: 4px;
  }

  .tab-btn {
    font-size: 0.78rem;
    padding: 6px 10px;
  }

  .panel-body {
    padding: 14px 14px;
  }

  .w3-tutorial-content {
    gap: 12px;
  }

  .w3-tutorial-content h1 {
    font-size: 1.45rem;
  }

  .w3-tutorial-content h2 {
    font-size: 1.2rem;
  }

  .w3-tutorial-content p,
  .w3-list {
    font-size: 0.92rem;
  }

  .w3-nav-btn {
    font-size: 0.82rem;
    padding: 6px 14px;
  }

  .w3-example-box {
    padding: 12px;
    margin: 10px 0;
  }

  .w3-example-box h3 {
    font-size: 0.95rem;
  }

  .w3-example-box pre {
    padding: 10px;
    font-size: 0.82rem;
  }

  .w3-try-btn {
    width: 100%;
    text-align: center;
    justify-content: center;
    padding: 8px 12px;
    font-size: 0.84rem;
  }

  /* Editor Header & Actions di Mobile */
  .editor-header-bar {
    height: auto;
    min-height: 44px;
    padding: 8px 10px;
    flex-wrap: wrap;
    gap: 6px;
  }

  .editor-file-tab {
    padding: 4px 8px;
    font-size: 0.78rem;
    height: auto;
  }

  .editor-actions-group {
    flex-wrap: wrap;
    gap: 4px;
  }

  .editor-actions-group .btn {
    font-size: 0.75rem;
    padding: 5px 8px;
  }

  .editor-workspace-wrap {
    height: 300px;
    min-height: 240px;
  }

  .terminal-header {
    height: auto;
    padding: 6px 10px;
    flex-wrap: wrap;
    gap: 6px;
  }

  .terminal-body {
    padding: 10px 12px;
    font-size: 0.8rem;
    max-height: 200px;
  }

  /* Sertifikat Modal Responsif */
  .modal-dialog {
    width: 95% !important;
    margin: 10px auto;
  }

  .cert-paper {
    padding: 10px;
  }

  .cert-border-inner {
    padding: 12px;
  }

  .cert-title {
    font-size: 1.25rem;
  }

  .cert-recipient-name {
    font-size: 1.25rem;
  }
}

/* Smartphone Sangat Sempit (< 380px: Galaxy Z Fold unfolded cover, dll) */
@media (max-width: 380px) {
  .navbar {
    padding: 0 6px;
  }

  .brand-text span {
    display: none; /* Hemat ruang hanya tampil 'Py' */
  }

  .btn-nav-compact {
    min-width: 30px !important;
    height: 30px !important;
    padding: 4px !important;
  }

  .panel-body {
    padding: 10px;
  }

  .w3-nav-buttons {
    flex-direction: column;
    width: 100%;
    gap: 6px;
  }

  .w3-nav-btn {
    width: 100%;
    text-align: center;
  }
}

/* Print CSS */
@media print {
  body * {
    visibility: hidden;
  }
  #cert-printable-area, #cert-printable-area * {
    visibility: visible;
  }
  #cert-printable-area {
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    box-shadow: none;
  }
}