/* ============================================================
   Lab Perakitan Komputer — Design System
   Dark Cyber-Lab Theme · Rasio 16:9 · Festival Biru Putih 2026
   ============================================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
  /* Brand Palette (Dark Lab / Neon Tech) */
  --c-primary: #00D4FF;
  --c-primary-hover: #33DDFF;
  --c-primary-glow: rgba(0, 212, 255, 0.3);
  --c-primary-dim: rgba(0, 212, 255, 0.12);

  --c-secondary: #7C3AED;
  --c-secondary-hover: #8B5CF6;
  --c-secondary-glow: rgba(124, 58, 237, 0.3);

  --c-success: #10B981;
  --c-success-hover: #34D399;
  --c-success-glow: rgba(16, 185, 129, 0.35);

  --c-warning: #F59E0B;
  --c-warning-hover: #FBBF24;

  --c-error: #EF4444;
  --c-error-hover: #F87171;
  --c-error-glow: rgba(239, 68, 68, 0.3);

  /* Surfaces */
  --c-bg-deep: #0F172A;
  --c-bg-panel: #1E293B;
  --c-bg-panel-hover: #283548;
  --c-bg-card: rgba(30, 41, 59, 0.85);
  --c-bg-glass: rgba(15, 23, 42, 0.75);
  --c-border: rgba(0, 212, 255, 0.12);
  --c-border-strong: rgba(0, 212, 255, 0.25);
  --c-border-subtle: rgba(148, 163, 184, 0.15);

  /* Typography */
  --c-text: #F1F5F9;
  --c-text-heading: #FFFFFF;
  --c-text-muted: #94A3B8;
  --c-text-dim: #64748B;

  /* Fonts */
  --font-heading: 'Fredoka', 'Nunito', system-ui, sans-serif;
  --font-body: 'Nunito', 'Poppins', system-ui, sans-serif;
  --font-mono: 'Courier New', 'Consolas', monospace;
  --font-scale: 1;

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-pill: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-glow-cyan: 0 0 20px rgba(0, 212, 255, 0.15);
  --shadow-glow-green: 0 0 20px rgba(16, 185, 129, 0.15);

  /* Transitions */
  --transition-fast: 0.12s ease;
  --transition-normal: 0.25s ease;
  --transition-bounce: 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
  font-size: calc(15px * var(--font-scale));
  scroll-behavior: smooth;
  overflow: hidden;
}

body {
  font-family: var(--font-body);
  color: var(--c-text);
  background: var(--c-bg-deep);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
  height: 100vh;
  width: 100vw;
}

/* ---------- Circuit Grid Background ---------- */
.lab-bg {
  position: fixed; inset: 0; z-index: 0;
  background:
    linear-gradient(135deg, #0F172A 0%, #0A0F1D 40%, #131C31 100%);
}
.lab-bg::before {
  content: '';
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
}

/* ---------- 16:9 Viewport Container ---------- */
.viewport-container {
  position: relative; z-index: 1;
  width: 100vw; height: 100vh;
  display: flex; align-items: center; justify-content: center;
}

.aspect-wrapper {
  position: relative;
  width: min(100vw, calc(100vh * 16 / 9));
  height: min(100vh, calc(100vw * 9 / 16));
  overflow: hidden;
  border-radius: 4px;
}

/* ---------- SPA Pages ---------- */
.page {
  position: absolute; inset: 0;
  display: none;
  flex-direction: column;
}
.page.active { display: flex; }

/* ---------- Content Box ---------- */
.content-box {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1.2em 2em;
  overflow: hidden;
}

.content-box.scrollable {
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--c-primary-dim) transparent;
}
.content-box.scrollable::-webkit-scrollbar { width: 6px; }
.content-box.scrollable::-webkit-scrollbar-track { background: transparent; }
.content-box.scrollable::-webkit-scrollbar-thumb {
  background: var(--c-primary-dim);
  border-radius: 3px;
}

/* ---------- Header Bar ---------- */
.header-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.6em 1.5em;
  background: var(--c-bg-glass);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border);
  min-height: 42px;
  flex-shrink: 0;
}
.header-bar .breadcrumb {
  font-size: 0.75em;
  color: var(--c-text-muted);
  display: flex; align-items: center; gap: 0.4em;
}
.header-bar .breadcrumb .sep { color: var(--c-text-dim); }
.header-bar .breadcrumb .current { color: var(--c-primary); font-weight: 700; }

/* ---------- Progress Dots ---------- */
.progress-dots {
  display: flex; align-items: center; gap: 6px;
}
.progress-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-text-dim);
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
}
.progress-dot.active {
  background: var(--c-primary);
  box-shadow: 0 0 8px var(--c-primary-glow);
  transform: scale(1.3);
}
.progress-dot.visited {
  background: var(--c-success);
}
.progress-dot:hover::after {
  content: attr(data-label);
  position: absolute;
  top: 110%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-bg-panel);
  color: var(--c-text);
  font-size: 0.65em;
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
  pointer-events: none;
  z-index: 100;
}

/* ---------- Navigation Buttons ---------- */
.nav-footer {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.6em 1.5em;
  background: var(--c-bg-glass);
  backdrop-filter: blur(12px);
  border-top: 1px solid var(--c-border);
  flex-shrink: 0;
  min-height: 42px;
}

.btn {
  display: inline-flex; align-items: center; gap: 0.5em;
  padding: 0.5em 1.3em;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8em;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-normal);
  text-decoration: none;
  line-height: 1.3;
}
.btn:active { transform: scale(0.96); }

.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), #0099CC);
  color: #000;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 212, 255, 0.25);
}
.btn-primary:hover {
  background: linear-gradient(135deg, var(--c-primary-hover), #00BBEE);
  box-shadow: 0 6px 24px rgba(0, 212, 255, 0.35);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--c-bg-panel);
  color: var(--c-text);
  border: 1px solid var(--c-border-strong);
}
.btn-secondary:hover {
  background: var(--c-bg-panel-hover);
  border-color: var(--c-primary);
}

.btn-success {
  background: linear-gradient(135deg, var(--c-success), #059669);
  color: #fff;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.25);
}
.btn-success:hover { transform: translateY(-1px); box-shadow: 0 6px 24px rgba(16, 185, 129, 0.35); }

.btn-danger {
  background: linear-gradient(135deg, var(--c-error), #DC2626);
  color: #fff; font-weight: 700;
}

.btn-ghost {
  background: transparent;
  color: var(--c-text-muted);
  border: 1px solid var(--c-border-subtle);
}
.btn-ghost:hover { color: var(--c-text); border-color: var(--c-border-strong); }

.btn-lg { font-size: 1em; padding: 0.7em 2em; border-radius: var(--radius-lg); }

/* ---------- Typography ---------- */
h1, h2, h3, h4 { font-family: var(--font-heading); color: var(--c-text-heading); line-height: 1.25; }
h1 { font-size: 2em; font-weight: 700; }
h2 { font-size: 1.5em; font-weight: 700; }
h3 { font-size: 1.15em; font-weight: 600; }
h4 { font-size: 0.95em; font-weight: 600; }

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

/* ---------- Cards & Panels ---------- */
.card {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1.2em;
  backdrop-filter: blur(8px);
  transition: var(--transition-normal);
}
.card:hover {
  border-color: var(--c-border-strong);
  box-shadow: var(--shadow-glow-cyan);
}
.card-clickable { cursor: pointer; }
.card-clickable:hover { transform: translateY(-2px); }

.glass-panel {
  background: var(--c-bg-glass);
  backdrop-filter: blur(12px);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 1em;
}

/* ---------- Info Cards & Fun Facts ---------- */
.info-card {
  background: rgba(0, 212, 255, 0.06);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-left: 3px solid var(--c-primary);
  border-radius: var(--radius-sm);
  padding: 0.8em 1em;
  margin: 0.8em 0;
  font-size: 0.88em;
}
.info-card h4 { margin-bottom: 0.4em; color: var(--c-primary); font-size: 0.95em; }

.fun-fact {
  background: rgba(124, 58, 237, 0.08);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-left: 3px solid var(--c-secondary);
  border-radius: var(--radius-sm);
  padding: 0.8em 1em;
  margin: 0.8em 0;
  font-size: 0.88em;
}
.fun-fact strong { color: var(--c-secondary-hover); }

/* ---------- Tables ---------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85em;
  margin: 0.6em 0;
}
.data-table th {
  background: var(--c-bg-panel);
  color: var(--c-primary);
  padding: 0.5em 0.8em;
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--c-border-strong);
}
.data-table td {
  padding: 0.45em 0.8em;
  border-bottom: 1px solid var(--c-border-subtle);
}
.data-table tbody tr:hover { background: rgba(0, 212, 255, 0.04); }

/* ---------- Two Column Layout ---------- */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8em;
  margin: 0.6em 0;
}

/* ---------- Cover Page ---------- */
.cover-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.8em;
  padding: 1.5em;
}
.cover-badge {
  display: inline-flex; align-items: center; gap: 0.5em;
  background: var(--c-primary-dim);
  border: 1px solid var(--c-border-strong);
  padding: 0.3em 1em;
  border-radius: var(--radius-pill);
  font-size: 0.72em;
  font-weight: 700;
  color: var(--c-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.cover-title {
  font-size: 2.4em;
  background: linear-gradient(135deg, var(--c-primary), var(--c-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.cover-subtitle {
  font-size: 1.05em;
  color: var(--c-text-muted);
  max-width: 600px;
}
.cover-tp {
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 0.8em 1.2em;
  text-align: left;
  font-size: 0.78em;
  max-width: 620px;
  width: 100%;
}
.cover-tp h4 { color: var(--c-primary); margin-bottom: 0.3em; font-size: 0.9em; }
.cover-tp ol { padding-left: 1.2em; color: var(--c-text-muted); }
.cover-tp li { margin-bottom: 0.2em; }
.cover-author {
  font-size: 0.78em;
  color: var(--c-text-dim);
}
.cover-author strong { color: var(--c-text-muted); }
.cover-logos {
  display: flex; align-items: center; justify-content: center; gap: 1em;
  margin-top: 0.3em;
}
.cover-logos img { height: 36px; opacity: 0.8; }

/* ---------- Teori Tabs ---------- */
.teori-tabs {
  display: flex; gap: 4px;
  flex-shrink: 0;
  margin-bottom: 0.8em;
  overflow-x: auto;
}
.teori-tab {
  padding: 0.45em 0.9em;
  font-family: var(--font-heading);
  font-size: 0.78em;
  font-weight: 600;
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--c-text-muted);
  cursor: pointer;
  transition: var(--transition-normal);
  white-space: nowrap;
}
.teori-tab:hover { color: var(--c-text); background: var(--c-bg-panel-hover); }
.teori-tab.active {
  background: var(--c-bg-card);
  color: var(--c-primary);
  border-color: var(--c-border-strong);
  border-bottom-color: transparent;
}
.teori-panel {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding: 0.8em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
  font-size: 0.88em;
  line-height: 1.65;
  scrollbar-width: thin;
  scrollbar-color: var(--c-primary-dim) transparent;
}
.teori-panel::-webkit-scrollbar { width: 5px; }
.teori-panel::-webkit-scrollbar-thumb { background: var(--c-primary-dim); border-radius: 3px; }
.teori-panel.active { display: block; }
.teori-panel h3 { margin-bottom: 0.4em; color: var(--c-primary); }
.teori-panel h4 { margin-top: 0.8em; margin-bottom: 0.3em; }
.teori-panel p { margin-bottom: 0.5em; }
.teori-panel ul, .teori-panel ol { padding-left: 1.2em; margin-bottom: 0.5em; }
.teori-panel li { margin-bottom: 0.2em; }

/* Komponen Grid in Teori */
.komponen-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin: 0.5em 0;
}
.komponen-grid-item {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  padding: 0.6em 0.4em;
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
}
.komponen-grid-item:hover { border-color: var(--c-border-strong); background: var(--c-bg-panel-hover); }
.komponen-grid-item.selected { border-color: var(--c-primary); box-shadow: var(--shadow-glow-cyan); }
.komponen-grid-item .kicon { font-size: 1.5em; }
.komponen-grid-item .kname { font-size: 0.72em; font-weight: 700; color: var(--c-text); }

.komponen-detail-panel {
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  padding: 0.8em;
  margin-top: 0.3em;
  font-size: 0.85em;
  min-height: 80px;
}
.komponen-detail-panel .placeholder-text { color: var(--c-text-dim); font-style: italic; }

/* ---------- Prosedur Steps ---------- */
.prosedur-list {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
  flex: 1;
  overflow-y: auto;
}
.prosedur-step {
  display: flex; align-items: flex-start; gap: 0.8em;
  padding: 0.5em 0.8em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  transition: var(--transition-normal);
}
.prosedur-step:hover { border-color: var(--c-border-strong); }
.prosedur-num {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-dim);
  color: var(--c-primary);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.78em;
  border-radius: 50%;
  flex-shrink: 0;
}
.prosedur-icon { font-size: 1.2em; flex-shrink: 0; }
.prosedur-text { font-size: 0.82em; color: var(--c-text); }

/* ---------- Simulasi Menu Cards ---------- */
.sim-menu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1em;
  flex: 1;
  align-content: center;
}
.sim-card {
  display: flex; flex-direction: column; align-items: center;
  text-align: center;
  padding: 1.5em 1em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition-normal);
  gap: 0.6em;
}
.sim-card:hover {
  border-color: var(--c-border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow-cyan);
}
.sim-card.primary-sim { border-color: var(--c-primary-dim); }
.sim-card .sim-icon { font-size: 2.5em; }
.sim-card .sim-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 0.95em;
}
.sim-card .sim-badge {
  font-size: 0.65em;
  padding: 0.2em 0.7em;
  border-radius: var(--radius-pill);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.sim-card .sim-badge.utama {
  background: var(--c-primary-dim);
  color: var(--c-primary);
  border: 1px solid rgba(0,212,255,0.2);
}
.sim-card .sim-badge.pendukung {
  background: rgba(124,58,237,0.1);
  color: var(--c-secondary-hover);
  border: 1px solid rgba(124,58,237,0.2);
}
.sim-card .sim-desc {
  font-size: 0.75em;
  color: var(--c-text-muted);
  line-height: 1.5;
}

/* ---------- Simulasi Rakit PC ---------- */
.rakit-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  grid-template-rows: 1fr auto;
  gap: 0.6em;
  flex: 1;
  overflow: hidden;
}

/* Component Shelf (Left Panel) */
.component-shelf {
  grid-row: 1 / 3;
  display: flex;
  flex-direction: column;
  gap: 0.4em;
  padding: 0.5em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  overflow-y: auto;
}
.shelf-title {
  font-family: var(--font-heading);
  font-size: 0.8em;
  font-weight: 700;
  color: var(--c-primary);
  text-align: center;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--c-border);
}
.component-card {
  display: flex; align-items: center; gap: 0.6em;
  padding: 0.55em 0.6em;
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  cursor: grab;
  transition: var(--transition-normal);
  user-select: none;
  touch-action: none;
}
.component-card:hover {
  border-color: var(--c-border-strong);
  background: var(--c-bg-panel-hover);
}
.component-card.dragging {
  opacity: 0.5;
  border-color: var(--c-primary);
}
.component-card.placed {
  opacity: 0.35;
  pointer-events: none;
}
.component-card .comp-icon { font-size: 1.5em; flex-shrink: 0; }
.component-card .comp-info { flex: 1; min-width: 0; }
.component-card .comp-name { font-size: 0.78em; font-weight: 700; color: var(--c-text); }
.component-card .comp-desc { font-size: 0.62em; color: var(--c-text-dim); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.component-card .comp-info-btn {
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  background: var(--c-primary-dim);
  color: var(--c-primary);
  border: none;
  border-radius: 50%;
  font-size: 0.65em;
  font-weight: 800;
  cursor: pointer;
  flex-shrink: 0;
}

/* Motherboard Area (Right Panel) */
.motherboard-area {
  display: flex;
  flex-direction: column;
  gap: 0.5em;
}

.motherboard-panel {
  flex: 1;
  position: relative;
  background: var(--c-bg-card);
  border: 2px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 0.8em;
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  overflow: hidden;
}
.motherboard-panel .mb-title {
  text-align: center;
  font-family: var(--font-heading);
  font-size: 0.75em;
  font-weight: 600;
  color: var(--c-text-dim);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.mb-slots {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(2, 1fr);
  gap: 0.5em;
  flex: 1;
}

.mb-slot {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.3em;
  background: rgba(148, 163, 184, 0.06);
  border: 2px dashed var(--c-text-dim);
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
  min-height: 60px;
  position: relative;
}
.mb-slot .slot-label {
  font-size: 0.65em;
  color: var(--c-text-dim);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.mb-slot .slot-icon { font-size: 0.85em; color: var(--c-text-dim); }
.mb-slot.drag-over {
  border-color: var(--c-primary);
  background: var(--c-primary-dim);
  box-shadow: 0 0 15px var(--c-primary-glow);
}
.mb-slot.filled {
  border-style: solid;
  border-color: var(--c-success);
  background: rgba(16, 185, 129, 0.08);
}
.mb-slot.filled .slot-label { color: var(--c-success); }
.mb-slot .slot-component {
  display: flex; align-items: center; gap: 0.4em;
  font-size: 0.8em; font-weight: 700;
  color: var(--c-text);
  cursor: pointer;
}
.mb-slot .slot-component:hover { color: var(--c-error); }

/* Control Buttons & Monitor */
.rakit-controls {
  display: flex;
  gap: 0.6em;
  align-items: stretch;
}

.controls-btns {
  display: flex;
  flex-direction: column;
  gap: 0.4em;
  min-width: 200px;
}

.boot-monitor {
  flex: 1;
  background: #000;
  border: 2px solid #333;
  border-radius: var(--radius-sm);
  padding: 0.6em 0.8em;
  font-family: var(--font-mono);
  font-size: 0.68em;
  color: #00FF41;
  line-height: 1.5;
  overflow-y: auto;
  min-height: 90px;
  max-height: 130px;
  white-space: pre-wrap;
  word-break: break-word;
}
.boot-monitor .cursor-blink { animation: blink 1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }
.boot-monitor .error-text { color: #FF4444; }
.boot-monitor .warn-text { color: #FFAA00; }
.boot-monitor .ok-text { color: #00FF41; }

/* Exploration Mode Selector */
.exploration-tabs {
  display: flex; gap: 3px; flex-shrink: 0;
}
.exploration-tab {
  padding: 0.3em 0.7em;
  font-size: 0.68em;
  font-weight: 600;
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  color: var(--c-text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
}
.exploration-tab:hover { color: var(--c-text); }
.exploration-tab.active {
  background: var(--c-primary-dim);
  color: var(--c-primary);
  border-color: var(--c-primary);
}

/* ---------- Binary Switch Simulation ---------- */
.binary-layout {
  display: flex;
  flex-direction: column;
  gap: 0.8em;
  flex: 1;
  overflow: hidden;
}

.binary-switches {
  display: flex;
  justify-content: center;
  gap: 0.6em;
}
.binary-bit {
  display: flex; flex-direction: column; align-items: center; gap: 0.3em;
  cursor: pointer;
  user-select: none;
}
.bit-weight {
  font-size: 0.65em;
  font-weight: 700;
  color: var(--c-text-dim);
  font-family: var(--font-mono);
}
.bit-led {
  width: 48px; height: 48px;
  border-radius: 50%;
  background: #3A1010;
  border: 3px solid #555;
  transition: var(--transition-normal);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2em; font-weight: 800;
  font-family: var(--font-mono);
  color: #661111;
}
.bit-led.on {
  background: radial-gradient(circle, #00FF88, #00CC66);
  border-color: #00FF88;
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.5), 0 0 40px rgba(0, 255, 136, 0.2);
  color: #003311;
}
.bit-index {
  font-size: 0.6em;
  color: var(--c-text-dim);
  font-family: var(--font-mono);
}

.binary-display {
  text-align: center;
  padding: 0.8em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
}
.binary-display .bin-value {
  font-family: var(--font-mono);
  font-size: 1.6em;
  font-weight: 700;
  color: var(--c-primary);
  letter-spacing: 0.15em;
}
.binary-display .dec-value {
  font-size: 2em;
  font-weight: 800;
  color: var(--c-text-heading);
  font-family: var(--font-heading);
}
.binary-display .calc-formula {
  font-size: 0.72em;
  color: var(--c-text-muted);
  font-family: var(--font-mono);
  margin-top: 0.3em;
}

.binary-challenges {
  display: flex;
  gap: 0.5em;
  justify-content: center;
}
.challenge-card {
  padding: 0.6em 1em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  text-align: center;
  min-width: 140px;
  transition: var(--transition-normal);
}
.challenge-card.solved {
  border-color: var(--c-success);
  background: rgba(16, 185, 129, 0.08);
}
.challenge-target {
  font-size: 1.4em;
  font-weight: 800;
  font-family: var(--font-heading);
  color: var(--c-warning);
}
.challenge-card.solved .challenge-target { color: var(--c-success); }
.challenge-hint { font-size: 0.65em; color: var(--c-text-dim); margin-top: 0.2em; }
.challenge-status { font-size: 0.7em; font-weight: 700; margin-top: 0.3em; }

/* ---------- RGB Mixer Simulation ---------- */
.rgb-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 0.8em;
  flex: 1;
  overflow: hidden;
}

.rgb-sliders-panel {
  display: flex;
  flex-direction: column;
  gap: 0.6em;
}
.rgb-slider-group {
  display: flex; align-items: center; gap: 0.8em;
}
.rgb-slider-label {
  font-size: 0.8em;
  font-weight: 700;
  width: 22px;
  text-align: center;
}
.rgb-slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 12px;
  border-radius: 6px;
  background: var(--c-bg-panel);
  outline: none;
  cursor: pointer;
}
.rgb-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px; height: 24px;
  border-radius: 50%;
  border: 3px solid #fff;
  cursor: grab;
  box-shadow: 0 2px 8px rgba(0,0,0,0.4);
}
.rgb-slider.slider-r::-webkit-slider-thumb { background: #FF4444; }
.rgb-slider.slider-g::-webkit-slider-thumb { background: #44FF44; }
.rgb-slider.slider-b::-webkit-slider-thumb { background: #4444FF; }
.rgb-slider-value {
  font-family: var(--font-mono);
  font-size: 0.85em;
  font-weight: 700;
  width: 36px;
  text-align: right;
}

.rgb-preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6em;
}
.rgb-preview-box {
  width: 180px; height: 180px;
  border-radius: var(--radius-lg);
  border: 3px solid var(--c-border-strong);
  transition: background-color 0.1s;
}
.rgb-codes {
  text-align: center;
}
.rgb-codes .hex-code {
  font-family: var(--font-mono);
  font-size: 1.1em;
  font-weight: 700;
  color: var(--c-primary);
}
.rgb-codes .rgb-code {
  font-family: var(--font-mono);
  font-size: 0.75em;
  color: var(--c-text-muted);
}

/* Sub-pixel visualizer */
.subpixel-vis {
  display: flex; gap: 3px;
  padding: 0.5em;
  background: #000;
  border-radius: var(--radius-sm);
  border: 1px solid #333;
}
.subpixel-bar {
  width: 16px;
  border-radius: 2px;
  transition: height 0.15s ease;
}

.rgb-challenges {
  display: flex;
  gap: 0.5em;
  margin-top: 0.4em;
}

/* ---------- LKPD Evaluation ---------- */
.lkpd-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.lkpd-section-tabs {
  display: flex; gap: 4px;
  flex-shrink: 0;
  margin-bottom: 0.6em;
}
.lkpd-section-tab {
  padding: 0.4em 1em;
  font-family: var(--font-heading);
  font-size: 0.78em;
  font-weight: 600;
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  color: var(--c-text-muted);
  cursor: pointer;
  transition: var(--transition-normal);
}
.lkpd-section-tab.active {
  background: var(--c-bg-card);
  color: var(--c-primary);
  border-color: var(--c-border-strong);
  border-bottom-color: transparent;
}

.lkpd-section {
  display: none;
  flex: 1;
  overflow-y: auto;
  padding: 0.8em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: 0 var(--radius-md) var(--radius-md) var(--radius-md);
}
.lkpd-section.active { display: block; }

/* PG Questions */
.pg-question {
  margin-bottom: 1em;
  padding-bottom: 0.8em;
  border-bottom: 1px solid var(--c-border-subtle);
}
.pg-question:last-child { border-bottom: none; }
.pg-q-text {
  font-size: 0.88em;
  font-weight: 600;
  margin-bottom: 0.5em;
}
.pg-q-num {
  color: var(--c-primary);
  font-weight: 700;
}
.pg-options {
  display: flex;
  flex-direction: column;
  gap: 0.3em;
}
.pg-option {
  display: flex; align-items: center; gap: 0.5em;
  padding: 0.4em 0.7em;
  background: var(--c-bg-panel);
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.82em;
  transition: var(--transition-fast);
}
.pg-option:hover { border-color: var(--c-border-strong); background: var(--c-bg-panel-hover); }
.pg-option.selected { border-color: var(--c-primary); background: var(--c-primary-dim); }
.pg-option.correct { border-color: var(--c-success); background: rgba(16,185,129,0.1); }
.pg-option.wrong { border-color: var(--c-error); background: rgba(239,68,68,0.1); }
.pg-option .opt-letter {
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  background: var(--c-bg-deep);
  border-radius: 50%;
  font-size: 0.75em; font-weight: 700;
  flex-shrink: 0;
}
.pg-explanation {
  display: none;
  margin-top: 0.4em;
  padding: 0.5em 0.7em;
  font-size: 0.78em;
  border-radius: var(--radius-sm);
}
.pg-explanation.show { display: block; }
.pg-explanation.correct-exp { background: rgba(16,185,129,0.08); border-left: 3px solid var(--c-success); color: var(--c-success); }
.pg-explanation.wrong-exp { background: rgba(239,68,68,0.08); border-left: 3px solid var(--c-error); color: var(--c-error-hover); }

/* BS Questions */
.bs-question {
  margin-bottom: 0.8em;
  padding-bottom: 0.6em;
  border-bottom: 1px solid var(--c-border-subtle);
}
.bs-statement { font-size: 0.88em; margin-bottom: 0.4em; }
.bs-buttons { display: flex; gap: 0.5em; }
.bs-btn {
  padding: 0.35em 1em;
  font-family: var(--font-heading);
  font-size: 0.78em;
  font-weight: 700;
  border: 1px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  background: var(--c-bg-panel);
  color: var(--c-text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
}
.bs-btn:hover { border-color: var(--c-border-strong); color: var(--c-text); }
.bs-btn.selected-true { border-color: var(--c-success); background: rgba(16,185,129,0.1); color: var(--c-success); }
.bs-btn.selected-false { border-color: var(--c-error); background: rgba(239,68,68,0.1); color: var(--c-error); }

/* Match (Menjodohkan) */
.match-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.6em;
}
.match-left, .match-right {
  display: flex;
  flex-direction: column;
  gap: 0.4em;
}
.match-item {
  padding: 0.5em 0.8em;
  background: var(--c-bg-panel);
  border: 2px solid var(--c-border-subtle);
  border-radius: var(--radius-sm);
  font-size: 0.82em;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
}
.match-item:hover { border-color: var(--c-border-strong); }
.match-item.selected {
  border-color: var(--c-primary);
  background: var(--c-primary-dim);
  box-shadow: 0 0 10px var(--c-primary-glow);
}
.match-item.paired {
  opacity: 0.6;
  pointer-events: none;
}

/* ---------- LKPD Hasil / Results ---------- */
.hasil-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1em;
  text-align: center;
}
.hasil-score-big {
  font-family: var(--font-heading);
  font-size: 3em;
  font-weight: 800;
  color: var(--c-primary);
}
.hasil-predikat {
  font-size: 1.3em;
  font-weight: 700;
}
.hasil-breakdown {
  display: flex; gap: 1em;
}
.hasil-part {
  padding: 0.6em 1.2em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  text-align: center;
}
.hasil-part .part-label { font-size: 0.72em; color: var(--c-text-muted); }
.hasil-part .part-score { font-size: 1.3em; font-weight: 800; color: var(--c-text); font-family: var(--font-heading); }

/* ---------- Pengembang Page ---------- */
.pengembang-content {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.dev-card {
  display: flex;
  align-items: center;
  gap: 2em;
  padding: 2em;
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-xl);
  max-width: 600px;
}
.dev-photo {
  width: 140px; height: 140px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--c-primary);
  box-shadow: 0 0 20px var(--c-primary-glow);
}
.dev-info h3 { color: var(--c-primary); margin-bottom: 0.3em; }
.dev-info p { font-size: 0.85em; color: var(--c-text-muted); margin-bottom: 0.2em; }

/* ---------- Referensi Page ---------- */
.ref-list {
  flex: 1;
  overflow-y: auto;
}
.ref-item {
  padding: 0.5em 0.8em;
  border-bottom: 1px solid var(--c-border-subtle);
  font-size: 0.82em;
  display: flex; gap: 0.6em;
}
.ref-type {
  font-size: 0.68em;
  font-weight: 700;
  padding: 0.15em 0.5em;
  background: var(--c-primary-dim);
  color: var(--c-primary);
  border-radius: var(--radius-pill);
  flex-shrink: 0;
  height: fit-content;
}
.ref-text { color: var(--c-text-muted); }

/* ---------- Info Tooltip / Popup ---------- */
.info-popup {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: var(--c-bg-panel);
  border: 2px solid var(--c-border-strong);
  border-radius: var(--radius-lg);
  padding: 1.5em;
  max-width: 420px;
  width: 90%;
  z-index: 1000;
  box-shadow: var(--shadow-lg);
  display: none;
}
.info-popup.show { display: block; }
.info-popup-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 999;
  display: none;
}
.info-popup-overlay.show { display: block; }
.info-popup h3 { color: var(--c-primary); margin-bottom: 0.5em; }
.info-popup p { font-size: 0.88em; color: var(--c-text-muted); margin-bottom: 0.4em; }
.info-popup .close-popup {
  position: absolute; top: 0.6em; right: 0.8em;
  background: none; border: none;
  color: var(--c-text-dim); font-size: 1.2em;
  cursor: pointer;
}

/* ---------- Testing Indicator ---------- */
#testing-indicator {
  position: fixed;
  bottom: 8px; left: 50%;
  transform: translateX(-50%);
  background: rgba(245, 158, 11, 0.9);
  color: #000;
  font-size: 0.6em;
  font-weight: 700;
  padding: 0.2em 0.8em;
  border-radius: var(--radius-pill);
  z-index: 9999;
  pointer-events: none;
  font-family: var(--font-mono);
}

/* ---------- Rotate Device Overlay ---------- */
.rotate-device-overlay {
  display: none;
  position: fixed; inset: 0;
  background: var(--c-bg-deep);
  z-index: 10000;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1em;
  color: var(--c-text);
  text-align: center;
  padding: 2em;
}
.rotate-device-overlay .rotate-icon {
  font-size: 4em;
  animation: rotateHint 2s ease-in-out infinite;
}
@keyframes rotateHint {
  0%, 100% { transform: rotate(0deg); }
  25% { transform: rotate(90deg); }
  75% { transform: rotate(90deg); }
}
.rotate-device-overlay h2 { font-family: var(--font-heading); color: var(--c-primary); }
.rotate-device-overlay p { font-size: 0.88em; color: var(--c-text-muted); max-width: 300px; }

@media (orientation: portrait) and (max-width: 900px) {
  .rotate-device-overlay { display: flex; }
  .viewport-container { display: none; }
}

/* ---------- Confetti Animation ---------- */
@keyframes confetti-fall {
  0% { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}
.confetti-piece {
  position: fixed;
  width: 8px; height: 8px;
  z-index: 9998;
  animation: confetti-fall 2.5s ease-in forwards;
}

/* ---------- Cycle Diagram (Teori) ---------- */
.cycle-diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4em;
  margin: 0.8em 0;
  flex-wrap: wrap;
}
.cycle-step {
  display: flex; flex-direction: column; align-items: center;
  padding: 0.6em;
  background: var(--c-bg-panel);
  border: 1px solid var(--step-color, var(--c-border));
  border-radius: var(--radius-md);
  min-width: 100px;
  text-align: center;
}
.cycle-icon { font-size: 1.5em; }
.cycle-label { font-size: 0.72em; font-weight: 800; color: var(--step-color); text-transform: uppercase; }
.cycle-desc { font-size: 0.6em; color: var(--c-text-muted); }
.cycle-arrow { font-size: 1.2em; color: var(--c-text-dim); }

/* ---------- Responsive Fine-Tuning ---------- */
@media (max-height: 700px) {
  .content-box { padding: 0.6em 1.2em; }
  h1 { font-size: 1.6em; }
  .cover-title { font-size: 1.8em; }
  .btn { padding: 0.4em 1em; font-size: 0.75em; }
  .mb-slots { gap: 0.3em; }
  .binary-switches { gap: 0.3em; }
  .bit-led { width: 38px; height: 38px; font-size: 1em; }
}

@media (max-width: 1000px) {
  .rakit-layout { grid-template-columns: 180px 1fr; }
  .rgb-layout { grid-template-columns: 1fr 220px; }
}