/* ============================================
   Modul Interaktif Fluida Dinamis - Stylesheet
   Color Palette: Navy / Blue / Cyan
   ============================================ */

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

/* --- Base --- */
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #0f172a; /* Dark navy for video background visibility */
  font-family: 'Inter', 'Segoe UI', system-ui, sans-serif;
  color: #334155; /* Slate 700 */
}

/* --- Background Video --- */
#bg-video, #menu-bg-video {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 0;
  opacity: 0;
  transition: opacity 0.5s ease-in-out;
}
#bg-video.active, #menu-bg-video.active {
  opacity: 1;
}

/* --- Main Canvas --- */
#mainCanvas {
  display: block;
  width: 100vw;
  height: 100vh;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

/* --- SVG Overlay Container --- */
#svgOverlayContainer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none; /* Let clicks pass through to canvas */
  z-index: 2;
  display: block; /* Removed flex to allow absolute positioning of children */
}

/* SVG Items inside container */
.svg-illustration {
  display: none; /* Hidden by default, JS will toggle */
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  filter: drop-shadow(0 10px 15px rgba(6, 182, 212, 0.3));
}

.svg-illustration.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

#svgAirplane {
  position: absolute;
  left: 5%;
  top: 35%;
}

#svgPipe {
  position: absolute;
  right: 5%;
  bottom: 10%;
}

/* --- Specific SVG Animations --- */

/* Airplane Lift Animation */
.svg-airplane {
  animation: floatAirplane 4s ease-in-out infinite;
}

@keyframes floatAirplane {
  0% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-10px) rotate(1deg); }
  100% { transform: translateY(0px) rotate(0deg); }
}

/* Flow Particles Animation */
.flow-particle {
  animation: flowRight 3s linear infinite;
}

@keyframes flowRight {
  0% { transform: translateX(0); opacity: 0; }
  10% { opacity: 1; }
  90% { opacity: 1; }
  100% { transform: translateX(200px); opacity: 0; }
}

/* --- Light Theme Card Panel (Replacing Glassmorphism) --- */
.glass-panel {
  background: #ffffff;
  border: 1px solid #cccccc;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.04);
}

/* --- Overlay (for iframes, modals, external content) --- */
.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85); /* Light overlay */
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.overlay:not(.hidden) {
  opacity: 1;
  pointer-events: auto;
}

.overlay.hidden {
  display: none;
}

/* --- Overlay iframe --- */
.overlay iframe {
  width: 90vw;
  max-width: 900px;
  height: 70vh;
  border: none; /* PhET style is often borderless or simple */
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transform: scale(0.95);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  background: #ffffff;
}

.overlay:not(.hidden) iframe {
  transform: scale(1);
}

/* --- Overlay close button --- */
.overlay .close-btn {
  position: absolute;
  top: 20px;
  right: 30px;
  background: rgba(59, 130, 246, 0.8);
  backdrop-filter: blur(4px);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 12px 24px;
  border-radius: 12px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.overlay .close-btn:hover {
  background: rgba(37, 99, 235, 1);
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
}

/* ========================================================= */
/* DOM HTML PAGES STYLING (HYBRID ARCHITECTURE)              */
/* ========================================================= */

.page-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: linear-gradient(180deg, #e1f5fe 0%, #f0f8ff 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  z-index: 5; /* Above canvas */
  overflow-y: auto;
  font-family: 'Segoe UI', system-ui, sans-serif;
  padding-bottom: 40px;
}

#canvas-container {
  z-index: 1; /* Below HTML pages */
  background: transparent !important;
  position: relative;
}

.page-container.hidden {
  display: none !important;
}

#page-MENU {
  background: rgba(15, 23, 42, 0.4) !important;
}

#page-MENU .page-header {
  color: #ffffff;
  text-shadow: 2px 2px 6px rgba(0,0,0,0.8);
}

/* Header */
.page-header {
  font-size: 28px;
  font-weight: 800;
  color: #212121;
  text-shadow: 2px 2px 0px rgba(255,255,255,0.8);
  margin-top: 40px;
  margin-bottom: 20px;
}

.page-content {
  width: 90%;
  max-width: 800px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-bottom: 60px;
}

/* Cards */
.card {
  background: #ffffff;
  border: 2px solid #e2e8f0;
  border-radius: 16px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.05);
  padding: 24px;
  width: 100%;
  color: #334155;
  box-sizing: border-box;
}

.content-card h3 {
  margin-top: 0;
  color: #212121;
}

.styled-list {
  padding-left: 24px;
  line-height: 1.6;
}

.tips-list {
  list-style: none;
  padding-left: 0;
  color: #64748b;
  font-size: 0.9em;
  line-height: 1.6;
}

/* Grid Layouts */
.menu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  width: 100%;
  max-width: 700px;
  margin-bottom: 40px;
}

.tujuan-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  width: 100%;
  margin-bottom: 30px;
}

@media (min-width: 768px) {
  .tujuan-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.card-header {
  font-weight: bold;
  padding-bottom: 12px;
  border-bottom: 2px solid #e2e8f0;
  margin-bottom: 16px;
}
.cyan-header { color: #06b6d4; }
.blue-header { color: #3b82f6; }

/* Buttons */
.nav-buttons-container {
  display: flex;
  gap: 16px;
  margin-top: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.btn, .menu-btn {
  font-family: 'Segoe UI', system-ui, sans-serif;
  font-size: 16px;
  font-weight: 700;
  border-radius: 999px; /* Pill shaped */
  padding: 12px 24px;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.menu-btn {
  flex-direction: column;
  padding: 24px;
  font-size: 18px;
  border-radius: 16px; /* Cards */
}
.menu-btn .icon {
  font-size: 32px;
  margin-bottom: 8px;
}
.menu-btn:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 20px rgba(0, 0, 0, 0.1);
  border-color: #3b82f6;
  background: #f8fafc;
}

.btn-primary {
  background: #002B49;
  color: #ffffff;
  border-bottom: 4px solid #001524;
}
.btn-primary:hover {
  background: #001A2C;
  transform: translateY(2px);
  border-bottom-width: 2px;
  margin-bottom: 2px;
}

.btn-secondary {
  background: #f59e0b;
  color: #ffffff;
  border-bottom: 4px solid #b45309;
}
.btn-secondary:hover {
  background: #d97706;
  transform: translateY(2px);
  border-bottom-width: 2px;
  margin-bottom: 2px;
}

.btn-ghost {
  background: transparent;
  color: #64748b;
  border: 2px solid #cbd5e1;
}
.btn-ghost:hover {
  background: #f1f5f9;
  color: #334155;
  border-color: #94a3b8;
}

.btn-success {
  background: #10b981;
  color: #ffffff;
  border-bottom: 4px solid #047857;
}
.btn-success:hover {
  background: #059669;
  transform: translateY(2px);
  border-bottom-width: 2px;
  margin-bottom: 2px;
}

.btn-danger {
  background: #ef4444;
  color: #ffffff;
  border-bottom: 4px solid #b91c1c;
}
.btn-danger:hover {
  background: #dc2626;
  transform: translateY(2px);
  border-bottom-width: 2px;
  margin-bottom: 2px;
}

/* --- Admin Table --- */
.admin-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  margin-top: 10px;
}
.admin-table th {
  padding: 14px 12px;
  background-color: #f1f5f9;
  border-bottom: 2px solid #e2e8f0;
  font-weight: 700;
  color: #1e293b;
  font-size: 14px;
}
.admin-table td {
  padding: 12px;
  border-bottom: 1px solid #e2e8f0;
  color: #475569;
  font-size: 14px;
  vertical-align: middle;
}
.admin-table tr {
  transition: background-color 0.2s ease;
}
.admin-table tr:hover {
  background-color: #f8fafc;
}
.admin-btn-delete {
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 700;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  background-color: #fee2e2;
  color: #ef4444;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}
.admin-btn-delete:hover {
  background-color: #fecaca;
  color: #dc2626;
  transform: scale(1.05);
}
.admin-btn-delete:active {
  transform: scale(0.95);
}


/* Radio buttons (Kuis) */
.quiz-option {
  display: block;
  padding: 12px 16px;
  margin-bottom: 12px;
  background: #f8fafc;
  border: 2px solid #e2e8f0;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  text-align: left;
}
.quiz-option:hover {
  background: #f1f5f9;
  border-color: #cbd5e1;
}
.quiz-option input {
  margin-right: 12px;
  transform: scale(1.2);
}
.quiz-option.selected {
  border-color: #3b82f6;
  background: #eff6ff;
}
.quiz-option.correct {
  border-color: #10b981;
  background: #ecfdf5;
}
.quiz-option.wrong {
  border-color: #ef4444;
  background: #fef2f2;
}

.keterangan-materi {
  margin-top: 16px;
  padding: 12px;
  background: #f1f5f9;
  border-radius: 8px;
  font-size: 0.95em;
}

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

/* --- Floating Chat --- */
#floating-chat-btn {
  position: fixed;
  bottom: 50px;
  right: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: #3b82f6;
  color: white;
  font-size: 30px;
  border: none;
  box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  cursor: pointer;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s;
}
#floating-chat-btn:hover {
  transform: scale(1.1);
}
#floating-chat-btn.hidden {
  display: none !important;
}

#floating-chat-popup {
  position: fixed;
  bottom: 120px;
  right: 20px;
  width: 350px;
  height: 450px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  z-index: 200;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid #cbd5e1;
}
#floating-chat-popup.hidden {
  display: none !important;
}
.chat-popup-header {
  background: #3b82f6;
  color: white;
  padding: 12px 16px;
  font-weight: bold;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.chat-popup-header button {
  background: transparent;
  border: none;
  color: white;
  font-size: 20px;
  cursor: pointer;
}
#floating-chat-history {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: #f8fafc;
}
.chat-popup-input {
  display: flex;
  border-top: 1px solid #cbd5e1;
}
.chat-popup-input input {
  flex: 1;
  border: none;
  padding: 12px;
  outline: none;
  font-family: inherit;
}
.chat-popup-input button {
  background: #3b82f6;
  color: white;
  border: none;
  padding: 0 16px;
  cursor: pointer;
  font-weight: bold;
}

/* --- Global Footer --- */
#app-footer {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 35px;
  background: #e2e8f0;
  border-top: 1px solid #cbd5e1;
  color: #64748b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  z-index: 100;
  pointer-events: none;
}

/* ========================================================= */
/* MOBILE RESPONSIVE (MAX-WIDTH: 768px)                      */
/* ========================================================= */
@media (max-width: 768px) {
  .page-header {
    font-size: 22px;
    margin-top: 20px;
    text-align: center;
  }
  .card {
    padding: 16px;
  }
  .menu-btn {
    padding: 16px;
    font-size: 16px;
  }
  .btn {
    padding: 10px 16px;
    font-size: 14px;
  }
  .svg-illustration {
    max-width: 160px;
    height: auto;
  }
  #svgAirplane {
    top: 5%;
    left: 5%;
  }
  #svgPipe {
    bottom: 5%;
    right: 5%;
  }
  .nav-buttons-container {
    gap: 8px;
  }
}