/* ==========================================================================
   Clean & High-Performance CSS untuk Platform Pembelajaran PHP 8.3 & MySQL
   Dirancang hemat resource, ultra-cepat, dan nyaman dibaca berjam-jam
   ========================================================================== */

:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f59e0b;
  --warning-light: #fffbeb;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--slate-50);
  color: var(--slate-800);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* Layout Container */
.container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Top Navbar */
.navbar {
  background: #ffffff;
  border-bottom: 1px solid var(--slate-200);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--slate-900);
}

.brand-badge {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 9999px;
  border: 1px solid #bfdbfe;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.nav-link {
  text-decoration: none;
  font-weight: 500;
  color: var(--slate-600);
  transition: color 0.15s ease;
  font-size: 0.92rem;
}

.nav-link:hover, .nav-link.active {
  color: var(--primary);
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--slate-100);
  padding: 6px 12px;
  border-radius: 9999px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--slate-700);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  font-weight: 600;
  font-size: 0.88rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.15s ease-in-out;
  line-height: 1.25;
}

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

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

.btn-success {
  background: var(--success);
  color: #ffffff;
}

.btn-success:hover {
  background: #059669;
}

.btn-outline {
  background: #ffffff;
  border-color: var(--slate-300);
  color: var(--slate-700);
}

.btn-outline:hover {
  background: var(--slate-100);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.btn-block {
  width: 100%;
}

/* Cards & Surfaces */
.card {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}

/* Flash Alerts */
.alert {
  padding: 0.9rem 1.2rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.alert-success { background: var(--success-light); border: 1px solid #a7f3d0; color: #065f46; }
.alert-danger  { background: var(--danger-light); border: 1px solid #fecaca; color: #991b1b; }
.alert-warning { background: var(--warning-light); border: 1px solid #fde68a; color: #92400e; }
.alert-info    { background: var(--primary-light); border: 1px solid #bfdbfe; color: #1e40af; }

/* Progress Bar */
.progress-track {
  width: 100%;
  height: 9px;
  background: var(--slate-200);
  border-radius: 9999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #2563eb, #10b981);
  border-radius: 9999px;
  transition: width 0.4s ease;
}

/* Typography for Lessons */
.lesson-reading {
  font-size: 1.02rem;
  line-height: 1.75;
  color: var(--slate-800);
}

.lesson-reading h2 {
  font-size: 1.45rem;
  margin-top: 1.8rem;
  margin-bottom: 0.75rem;
  color: var(--slate-900);
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--slate-200);
}

.lesson-reading h3 {
  font-size: 1.2rem;
  margin-top: 1.4rem;
  margin-bottom: 0.6rem;
  color: var(--slate-900);
}

.lesson-reading p {
  margin-bottom: 1rem;
}

.lesson-reading ul, .lesson-reading ol {
  margin-left: 1.5rem;
  margin-bottom: 1.1rem;
}

.lesson-reading li {
  margin-bottom: 0.35rem;
}

.note-box {
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

.tip-box {
  background: var(--success-light);
  border-left: 4px solid var(--success);
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

/* Code Blocks & Highlighting */
pre {
  background: #0f172a;
  color: #f8fafc;
  padding: 1.1rem;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.55;
  margin: 1rem 0;
}

code {
  font-family: var(--font-mono);
  background: var(--slate-100);
  color: #b91c1c;
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.88em;
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-locked { background: var(--slate-200); color: var(--slate-600); }
.badge-unlocked { background: var(--primary-light); color: var(--primary); border: 1px solid #bfdbfe; }
.badge-in_progress { background: var(--warning-light); color: #b45309; border: 1px solid #fde68a; }
.badge-completed { background: var(--success-light); color: #047857; border: 1px solid #a7f3d0; }

/* Section & List Layout */
.section-block {
  margin-bottom: 2.25rem;
}

.section-title-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--slate-200);
}

.section-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--slate-900);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.section-count {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--slate-600);
  background: var(--slate-200);
  padding: 2px 8px;
  border-radius: 9999px;
}

.lesson-list {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.lesson-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 1.1rem 1.35rem;
  border-bottom: 1px solid var(--slate-100);
  transition: background-color 0.15s ease;
}

.lesson-row:last-child {
  border-bottom: none;
}

.lesson-row:hover:not(.locked) {
  background-color: #f8fafc;
}

.lesson-row.locked {
  background-color: #fafbfc;
  opacity: 0.75;
}

.lesson-row-left {
  display: flex;
  align-items: flex-start;
  gap: 1.1rem;
  flex: 1;
}

.lesson-badge-number {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  background: var(--slate-100);
  color: var(--slate-600);
  flex-shrink: 0;
}

.lesson-row.completed .lesson-badge-number {
  background: var(--success-light);
  color: var(--success);
  border: 1px solid #a7f3d0;
}

.lesson-row.active-unlocked .lesson-badge-number {
  background: var(--primary-light);
  color: var(--primary);
  border: 1px solid #bfdbfe;
}

.lesson-meta-wrap {
  flex: 1;
}

.lesson-row-title {
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--slate-900);
  line-height: 1.35;
  margin-bottom: 0.25rem;
}

.lesson-row-desc {
  font-size: 0.84rem;
  color: var(--slate-600);
  line-height: 1.5;
  margin-bottom: 0.4rem;
}

.lesson-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.76rem;
}

.lesson-chip-item {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  color: var(--slate-600);
}

.lesson-chip-item.passed {
  color: #059669;
  font-weight: 600;
}

.lesson-row-right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}

@media (max-width: 768px) {
  .lesson-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.85rem;
  }
  .lesson-row-right {
    width: 100%;
    justify-content: space-between;
  }
  .lesson-row-right .btn {
    width: 100%;
  }
}

/* Grid Dashboard Modules */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.module-card {
  background: #ffffff;
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-md);
  padding: 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
}

.module-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.module-card.locked {
  background: #f8fafc;
  opacity: 0.72;
}

.module-card.locked:hover {
  transform: none;
  box-shadow: var(--shadow-sm);
}

/* Live Code Editor & Sandbox */
.code-editor-wrapper {
  background: #0f172a;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--slate-700);
  margin-top: 1rem;
}

.code-editor-header {
  background: #1e293b;
  padding: 0.65rem 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--slate-700);
  color: #cbd5e1;
  font-size: 0.82rem;
  font-weight: 600;
}

.code-textarea {
  width: 100%;
  min-height: 240px;
  background: #090d16;
  color: #38bdf8;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.6;
  padding: 1rem;
  border: none;
  outline: none;
  resize: vertical;
}

.terminal-box {
  background: #05080f;
  color: #a7f3d0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  padding: 1rem;
  min-height: 100px;
  max-height: 260px;
  overflow-y: auto;
  border-top: 1px solid #1e293b;
  white-space: pre-wrap;
}

/* MCQ Options */
.mcq-option-label {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  background: var(--slate-50);
  border: 1px solid var(--slate-200);
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-bottom: 0.65rem;
  transition: all 0.15s ease;
  font-size: 0.92rem;
}

.mcq-option-label:hover {
  background: var(--primary-light);
  border-color: #93c5fd;
}

.mcq-option-label input[type="radio"] {
  margin-top: 3px;
}

/* Tabs */
.tabs-nav {
  display: flex;
  gap: 0.5rem;
  border-bottom: 1px solid var(--slate-200);
  margin-bottom: 1.5rem;
}

.tab-btn {
  padding: 0.65rem 1.25rem;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--slate-600);
  cursor: pointer;
}

.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* Responsive */
@media (max-width: 768px) {
  .module-grid {
    grid-template-columns: 1fr;
  }
  .nav-inner {
    height: auto;
    padding: 0.75rem 0;
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* ============================================================
   PROTEKSI ANTI-COPY, ANTI-SELECTION & INTEGRITAS BELAJAR
   Mencegah siswa melakukan seleksi teks dan salin-tempel instan
   ============================================================ */
body, 
.lesson-reading, 
.quiz-card, 
.section-block, 
.lesson-row, 
.note-box, 
pre, 
code, 
.terminal-box, 
.mcq-option-label {
  -webkit-user-select: none !important;
  -moz-user-select: none !important;
  -ms-user-select: none !important;
  user-select: none !important;
  -webkit-touch-callout: none !important;
}

/* Biarkan elemen isian formulir dan area koding bisa diketik manual */
input, 
textarea, 
select {
  -webkit-user-select: text !important;
  -moz-user-select: text !important;
  -ms-user-select: text !important;
  user-select: text !important;
}