/* Import Google Font */
@import url("https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Caveat:wght@700&display=swap");

/* CSS Variables for White, Gold, and Blue Theme */
:root {
  --primary-color: #d97706; /* Gold/Amber-600 */
  --primary-hover: #b45309; /* Dark Gold/Amber-700 */
  --primary-light: #fef3c7; /* Gold-50 */
  --secondary-color: #1e40af; /* Deep Blue-700 */
  --secondary-hover: #1d4ed8; /* Blue-600 */
  --secondary-light: #eff6ff; /* Blue-50 */
  --text-dark: #0f172a; /* Slate-900 */
  --text-medium: #475569; /* Slate-600 */
  --text-light: #94a3b8; /* Slate-400 */
  --card-bg: #ffffff; /* White (Most Primary) */
  --bg-color: #fafaf9; /* Stone-50 (Warm drafting sheet) */

  --success-color: #10b981; /* Emerald-500 */
  --error-color: #ef4444; /* Red-500 */
  --border-radius-sm: 6px;
  --border-radius-md: 12px;
  --border-radius-lg: 18px;
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --sketch-shadow: 4px 4px 0px rgba(15, 23, 42, 0.15);
  --sketch-shadow-hover: 6px 6px 0px rgba(15, 23, 42, 0.25);

  /* Simulator CSS Variables */
  --light-x: 50%;
  --light-y: 15%;
  --shadow-x: 0px;
  --shadow-y: 50px;
  --shadow-blur: 10px;
  --shadow-scale-x: 1;
  --shadow-scale-y: 0.3;
  --shadow-opacity: 0.5;
  --shadow-angle: 0rad;
}

/* Reset & Base Styles with Sketchbook Grid Background */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family:
    "Outfit",
    -apple-system,
    BlinkMacSystemFont,
    sans-serif;
  background-color: var(--bg-color);
  /* Drafting/Notebook Grid Pattern */
  background-image:
    linear-gradient(to right, rgba(30, 64, 175, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 64, 175, 0.03) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--text-dark);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  accent-color: var(--primary-color);
  position: relative;
}

/* Notebook margin line on the left side of the page (large screens) */
@media (min-width: 1280px) {
  body::before {
    content: "";
    position: absolute;
    top: 0;
    left: 80px;
    width: 2px;
    height: 100%;
    background-color: rgba(239, 68, 68, 0.15); /* Red notebook line */
    pointer-events: none;
    z-index: 1;
  }
}

.max-width-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

h1,
h2,
h3,
h4 {
  font-weight: 800;
  line-height: 1.2;
}

.handwritten {
  font-family: "Caveat", cursive;
  font-size: 1.5rem;
  color: var(--primary-color);
  transform: rotate(-2deg);
  display: inline-block;
}

/* Header - Modern White & Gold Border */
header {
  background-color: #ffffff;
  border-bottom: 3px solid var(--text-dark);
  box-shadow: 0 4px 0px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 0;
  z-index: 100;
}

header .max-width-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 16px;
  padding-bottom: 16px;
}

.header-brand h1 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--secondary-color);
  letter-spacing: -0.5px;
}

.header-brand p {
  font-size: 0.85rem;
  color: var(--text-medium);
  font-weight: 500;
}

/* Buttons - Sketch/Tactile style */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: "Outfit", sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: var(--border-radius-sm);
  border: 2px solid var(--text-dark);
  cursor: pointer;
  transition: var(--transition-smooth);
  text-decoration: none;
  background-color: #ffffff;
  color: var(--text-dark);
  box-shadow: 3px 3px 0px var(--text-dark);
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
  box-shadow: 3px 3px 0px var(--text-dark);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--text-dark);
}

.btn-primary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--text-dark);
}

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

.btn-secondary:hover {
  background-color: var(--secondary-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--text-dark);
}

.btn-secondary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--text-dark);
}

.btn:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--text-dark);
}

.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0px var(--text-dark);
}

/* Hero Section */
.hero-section {
  text-align: center;
  padding: 60px 0 40px;
}

.hero-section h2 {
  font-size: 2.5rem;
  color: var(--text-dark);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero-section p {
  font-size: 1.1rem;
  color: var(--text-medium);
  max-width: 700px;
  margin: 0 auto 30px;
}

.hero-ctas {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* Workbook Sketch Cards */
.workbook-card {
  background-color: var(--card-bg);
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-md);
  padding: 28px;
  box-shadow: var(--sketch-shadow);
  transition: var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.workbook-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background-color: var(--primary-color);
}

.workbook-card.blue-accent::before {
  background-color: var(--secondary-color);
}

.workbook-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: var(--sketch-shadow-hover);
}

/* Module Grid */
.grid-3-columns,
.grid-2-columns {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  padding: 30px 0 60px;
}

@media (min-width: 768px) {
  .grid-3-columns {
    grid-template-columns: repeat(3, 1fr);
  }
  .grid-2-columns {
    grid-template-columns: repeat(2, 1fr);
  }
}

.module-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.module-badge {
  background-color: var(--primary-light);
  color: var(--primary-hover);
  font-weight: 700;
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: 9999px;
  display: inline-block;
  margin-bottom: 12px;
  border: 1px solid rgba(217, 119, 6, 0.2);
}

.module-card h3 {
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: var(--secondary-color);
}

.module-card p {
  font-size: 0.95rem;
  color: var(--text-medium);
  margin-bottom: 24px;
}

/* Drawing / Sketching Elements */
.design-banner {
  background-color: #ffffff;
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-md);
  padding: 24px;
  margin-bottom: 40px;
  display: flex;
  align-items: center;
  gap: 20px;
  box-shadow: var(--sketch-shadow);
}

.design-banner-icon {
  font-size: 3rem;
}

.design-banner-text h4 {
  font-size: 1.1rem;
  color: var(--text-dark);
}

.design-banner-text p {
  font-size: 0.9rem;
  color: var(--text-medium);
}

/* Page Headers */
.page-header {
  padding: 40px 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px dashed var(--text-light);
  margin-bottom: 40px;
}

.page-header h2 {
  font-size: 2.2rem;
  color: var(--secondary-color);
}

.back-link {
  font-weight: 700;
  color: var(--text-dark);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-smooth);
}

.back-link:hover {
  color: var(--primary-color);
  transform: translateX(-2px);
}

/* Simulator Container & Restricted Top Zone Layout */
.simulator-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 900px) {
  .simulator-layout {
    grid-template-columns: 1.2fr 0.8fr;
  }
}

.simulator-outer {
  background-color: #ffffff;
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-lg);
  padding: 20px;
  box-shadow: var(--sketch-shadow);
}

.simulator-container {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  background: linear-gradient(to bottom, #f8fafc 0%, #e2e8f0 100%);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: inset 0 2px 8px rgba(0, 0, 0, 0.08);
  touch-action: none;
  border: 1px solid #cbd5e1;
}

/* Ground plane hint */
.simulator-container::before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 22%;
  background: linear-gradient(to bottom, transparent, rgba(148, 163, 184, 0.1));
  pointer-events: none;
  z-index: 1;
}

/* Visually splitting the top-half draggable area */
.simulator-container::after {
  content: "── Zon Gerakan Mentol (Atas) ──";
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  border-top: 1.5px dashed rgba(30, 64, 175, 0.15);
  color: rgba(30, 64, 175, 0.25);
  font-size: 0.7rem;
  font-weight: 700;
  text-align: center;
  padding-top: 4px;
  pointer-events: none;
  z-index: 8;
}

/* SVG Projection Lines */
.projection-lines {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 4;
  pointer-events: none;
}

.proj-line {
  stroke: rgba(30, 64, 175, 0.45);
  stroke-width: 0.35;
  stroke-dasharray: 1.5 0.8;
}

.proj-line-shadow {
  stroke: rgba(217, 119, 6, 0.4);
  stroke-width: 0.35;
  stroke-dasharray: 1 0.6;
}

.light-dot {
  fill: var(--primary-color);
  opacity: 0.85;
}

.light-source {
  position: absolute;
  left: var(--light-x);
  top: var(--light-y);
  transform: translate(-50%, -50%);
  width: 48px;
  height: 48px;
  cursor: grab;
  z-index: 10;
  font-size: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  filter: drop-shadow(0 0 10px rgba(245, 158, 11, 0.6));
}

.light-source:active {
  cursor: grabbing;
  transform: translate(-50%, -50%) scale(1.1);
}

.shading-object {
  position: absolute;
  top: 65%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 76px;
  height: 110px;
  border-radius: 0 0 38px 38px / 0 0 15px 15px;
  z-index: 5;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  background: linear-gradient(
    to right,
    #451a03 0%,
    #b45309 30%,
    #f59e0b 50%,
    #b45309 70%,
    #451a03 100%
  );
}

.cylinder-top {
  position: absolute;
  top: -10px;
  left: 0;
  width: 100%;
  height: 20px;
  border-radius: 50%;
  z-index: 6;
  border-bottom: 1px solid rgba(0, 0, 0, 0.15);
  background: radial-gradient(
    circle at 50% 50%,
    #ffffff 0%,
    #f59e0b 60%,
    #b45309 100%
  );
}

.cast-shadow {
  position: absolute;
  z-index: 2;
  pointer-events: none;
  filter: blur(var(--shadow-blur));
  opacity: var(--shadow-opacity);
  background: radial-gradient(
    ellipse at 50% 20%,
    rgba(30, 41, 59, 0.6) 0%,
    rgba(30, 41, 59, 0.3) 50%,
    transparent 100%
  );
  border-radius: 50%;
  /* Position & size set entirely by JS */
}

.simulator-text-info {
  margin-top: 24px;
}

.simulator-text-info h3 {
  font-size: 1.5rem;
  color: var(--secondary-color);
  margin-bottom: 12px;
}

.simulator-text-info p {
  color: var(--text-medium);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

/* Quiz Page Styles (latihan.html) */
.quiz-layout-card {
  background-color: #ffffff;
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-lg);
  padding: 36px;
  box-shadow: var(--sketch-shadow);
  max-width: 750px;
  margin: 0 auto 60px;
}

.quiz-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 700;
  margin-bottom: 12px;
  font-size: 0.9rem;
  color: var(--secondary-color);
}

.quiz-progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--secondary-light);
  border: 1px solid var(--text-dark);
  border-radius: 9999px;
  overflow: hidden;
  margin-bottom: 28px;
}

.quiz-progress-fill {
  height: 100%;
  background-color: var(--primary-color);
  width: 0%;
  transition: width 0.3s ease;
}

.quiz-question-box {
  background-color: var(--secondary-light);
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-md);
  padding: 24px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-dark);
  margin-bottom: 28px;
  position: relative;
}

.quiz-question-box::before {
  content: "SOALAN";
  position: absolute;
  top: -10px;
  left: 20px;
  background-color: var(--secondary-color);
  color: #ffffff;
  font-size: 0.65rem;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--text-dark);
}

.quiz-options-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.quiz-opt-btn {
  width: 100%;
  text-align: left;
  padding: 16px 20px;
  background-color: #ffffff;
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-md);
  font-family: "Outfit", sans-serif;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
  cursor: pointer;
  transition: var(--transition-smooth);
  box-shadow: 2px 2px 0px var(--text-dark);
}

.quiz-opt-btn:hover {
  background-color: var(--primary-light);
  transform: translateX(2px);
}

.quiz-opt-btn.correct {
  background-color: #d1fae5;
  border-color: var(--success-color);
  color: #065f46;
  box-shadow: 2px 2px 0px var(--success-color);
}

.quiz-opt-btn.incorrect {
  background-color: #fee2e2;
  border-color: var(--error-color);
  color: #991b1b;
  box-shadow: 2px 2px 0px var(--error-color);
}

.quiz-action-bar {
  display: flex;
  justify-content: flex-end;
}

/* Result Overlay */
.result-screen {
  text-align: center;
  padding: 20px 0;
}

.result-score-circle {
  width: 120px;
  height: 120px;
  background-color: var(--primary-light);
  border: 3px dashed var(--primary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 24px;
  font-size: 2rem;
  font-weight: 800;
  color: var(--primary-hover);
}

/* Modals / Dialog */
dialog {
  border: 2px solid var(--text-dark);
  border-radius: var(--border-radius-lg);
  padding: 30px;
  max-width: 550px;
  width: 90%;
  box-shadow: var(--sketch-shadow);
  margin: auto;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #ffffff;
}

dialog::backdrop {
  background: rgba(15, 23, 42, 0.4);
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}

.dialog-header h3 {
  font-size: 1.5rem;
  color: var(--secondary-color);
}

.dialog-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-medium);
  transition: var(--transition-smooth);
}

.dialog-close:hover {
  color: var(--text-dark);
  transform: scale(1.1);
}

.dialog-body {
  color: var(--text-medium);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Footer */
footer {
  background-color: #ffffff;
  color: var(--text-dark);
  padding: 30px 0;
  text-align: center;
  border-top: 3px solid var(--text-dark);
  margin-top: 60px;
}

footer h4 {
  font-size: 1.2rem;
  color: var(--secondary-color);
}

footer p {
  font-size: 0.85rem;
  color: var(--text-medium);
}

.confetti-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  pointer-events: none;
  z-index: 999;
}