/* Dart PPT - Modern Dark Theme */
/* Higher Order Function, Anonymous Function, Scope */

/* ==================== CSS VARIABLES ==================== */
:root {
  --dart-blue-dark: #0553b1;
  --dart-blue: #0175c2;
  --dart-blue-light: #13b9fd;
  --dart-gradient: linear-gradient(
    135deg,
    #0553b1 0%,
    #0175c2 50%,
    #13b9fd 100%
  );

  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-glass: rgba(255, 255, 255, 0.05);

  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.5);

  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-glow: 0 0 40px rgba(1, 117, 194, 0.3);

  --font-main: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-code: "Fira Code", "Consolas", monospace;

  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
}

@media (max-width: 900px) {
  .objective-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .objective-grid {
    grid-template-columns: 1fr;
  }
}

/* Learning objectives */
.learning-objectives {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto 2rem;
  padding: 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(14px);
}

.learning-objectives h2 {
  margin: 0 0 1rem;
  color: #13b9fd;
  text-align: center;
}

.objective-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.objective-grid article {
  padding: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.045);
}

.objective-grid strong,
.objective-grid span {
  display: block;
}

.objective-grid strong {
  margin-bottom: 0.5rem;
}

.objective-grid span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.9rem;
  line-height: 1.55;
}

/* ==================== RESET & BASE ==================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* ==================== ANIMATED BACKGROUND ==================== */
.bg-animation {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

.bg-animation::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background:
    radial-gradient(
      circle at 20% 80%,
      rgba(1, 117, 194, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 80% 20%,
      rgba(19, 185, 253, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      circle at 40% 40%,
      rgba(5, 83, 177, 0.08) 0%,
      transparent 40%
    );
  animation: bgMove 20s ease-in-out infinite;
}

@keyframes bgMove {
  0%,
  100% {
    transform: translate(0, 0) rotate(0deg);
  }
  25% {
    transform: translate(2%, 2%) rotate(1deg);
  }
  50% {
    transform: translate(-1%, 3%) rotate(-1deg);
  }
  75% {
    transform: translate(3%, -2%) rotate(0.5deg);
  }
}

/* Floating Dart Logos */
.floating-logo {
  position: fixed;
  opacity: 0.03;
  pointer-events: none;
  z-index: -1;
  animation: float 15s ease-in-out infinite;
}

.floating-logo:nth-child(1) {
  top: 10%;
  left: 5%;
  width: 150px;
  animation-delay: 0s;
}
.floating-logo:nth-child(2) {
  top: 60%;
  right: 10%;
  width: 100px;
  animation-delay: -5s;
}
.floating-logo:nth-child(3) {
  bottom: 15%;
  left: 15%;
  width: 80px;
  animation-delay: -10s;
}
.floating-logo:nth-child(4) {
  top: 30%;
  right: 5%;
  width: 120px;
  animation-delay: -7s;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(5deg);
  }
}

/* ==================== LANDING PAGE ==================== */
.landing-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 20px;
  position: relative;
}

.header {
  text-align: center;
  margin-bottom: 60px;
  animation: fadeInDown 0.8s ease;
}

.header-logo {
  width: 100px;
  height: 100px;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 30px rgba(1, 117, 194, 0.5));
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
    filter: drop-shadow(0 0 30px rgba(1, 117, 194, 0.5));
  }
  50% {
    transform: scale(1.05);
    filter: drop-shadow(0 0 50px rgba(19, 185, 253, 0.7));
  }
}

.header h1 {
  font-size: 3rem;
  font-weight: 800;
  background: var(--dart-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 15px;
  text-shadow: 0 0 40px rgba(1, 117, 194, 0.3);
}

.header p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 600px;
}

.header .module-badge {
  display: inline-block;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  padding: 8px 20px;
  border-radius: 30px;
  font-size: 0.9rem;
  color: var(--dart-blue-light);
  margin-top: 15px;
}

/* Topic Cards Grid */
.topics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  max-width: 1200px;
  width: 100%;
  padding: 0 20px;
}

.topic-card {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 40px 30px;
  cursor: pointer;
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--card-color, var(--dart-gradient));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-medium);
}

.topic-card:hover::before {
  transform: scaleX(1);
}

.topic-card:hover {
  transform: translateY(-8px);
  border-color: rgba(1, 117, 194, 0.5);
  box-shadow: var(--shadow-glow);
  background: rgba(255, 255, 255, 0.08);
}

.topic-card .icon {
  font-size: 3rem;
  margin-bottom: 20px;
  display: block;
}

.topic-card h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.topic-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
}

.topic-card .slide-count {
  position: absolute;
  bottom: 20px;
  right: 25px;
  background: var(--bg-card);
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--text-muted);
  border: 1px solid var(--border-color);
}

/* Card Colors */
.topic-card[data-topic="higherOrderFunction"] {
  --card-color: #0175c2;
}
.topic-card[data-topic="anonymousFunction"] {
  --card-color: #13b9fd;
}
.topic-card[data-topic="scope"] {
  --card-color: #0553b1;
}
.topic-card[data-topic="tugasRumah"] {
  --card-color: #6c63ff;
}
.topic-card[data-topic="kesimpulan"] {
  --card-color: #ff6b6b;
}

/* Animation on load */
.topic-card {
  animation: fadeInUp 0.6s ease backwards;
}
.topic-card:nth-child(1) {
  animation-delay: 0.1s;
}
.topic-card:nth-child(2) {
  animation-delay: 0.2s;
}
.topic-card:nth-child(3) {
  animation-delay: 0.3s;
}
.topic-card:nth-child(4) {
  animation-delay: 0.4s;
}
.topic-card:nth-child(5) {
  animation-delay: 0.5s;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== SLIDE VIEWER ==================== */
.slide-viewer {
  display: none;
  min-height: 100vh;
  flex-direction: column;
}

.slide-viewer.active {
  display: flex;
}

/* Slide Header */
.slide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 40px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.slide-header .back-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.slide-header .back-btn:hover {
  background: rgba(1, 117, 194, 0.2);
  border-color: var(--dart-blue);
}

.slide-header .topic-title {
  display: flex;
  align-items: center;
  gap: 15px;
}

.slide-header .topic-title img {
  width: 40px;
  height: 40px;
}

.slide-header .topic-title h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
}

.slide-header .progress-info {
  display: flex;
  align-items: center;
  gap: 15px;
}

.slide-header .slide-counter {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.progress-bar {
  width: 200px;
  height: 6px;
  background: var(--bg-glass);
  border-radius: 10px;
  overflow: hidden;
}

.progress-bar .fill {
  height: 100%;
  background: var(--dart-gradient);
  transition: width var(--transition-medium);
  border-radius: 10px;
}

/* Slide Content Area */
.slide-content-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  overflow-y: auto;
}

.slide-content {
  max-width: 1000px;
  width: 100%;
  animation: slideIn 0.4s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideOut {
  from {
    opacity: 1;
    transform: translateX(0);
  }
  to {
    opacity: 0;
    transform: translateX(-30px);
  }
}

.slide-content .slide-title {
  text-align: center;
  margin-bottom: 40px;
}

.slide-content .slide-title h1 {
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--dart-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}

.slide-content .slide-title p {
  font-size: 1.2rem;
  color: var(--text-secondary);
}

.slide-content .slide-body {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 40px;
}

/* Slide Navigation */
.slide-navigation {
  display: flex;
  justify-content: center;
  gap: 20px;
  padding: 30px;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: 14px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.nav-btn.prev {
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.nav-btn.prev:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
}

.nav-btn.next {
  background: var(--dart-gradient);
  color: white;
  box-shadow: 0 4px 20px rgba(1, 117, 194, 0.4);
}

.nav-btn.next:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 30px rgba(1, 117, 194, 0.5);
}

.nav-btn:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

/* ==================== CONTENT STYLING ==================== */
/* Intro Box */
.intro-box {
  text-align: center;
}

.intro-box h3 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--dart-blue-light);
}

.intro-box p {
  font-size: 1.1rem;
  margin-bottom: 15px;
  color: var(--text-secondary);
}

.intro-box ul {
  list-style: none;
  text-align: left;
  max-width: 500px;
  margin: 20px auto;
}

.intro-box ul li {
  padding: 12px 20px;
  background: var(--bg-card);
  border-radius: 12px;
  margin-bottom: 10px;
  font-size: 1.05rem;
  border-left: 3px solid var(--dart-blue);
}

.intro-box .highlight {
  background: linear-gradient(
    135deg,
    rgba(1, 117, 194, 0.2),
    rgba(19, 185, 253, 0.1)
  );
  padding: 20px;
  border-radius: 16px;
  margin-top: 25px;
  border: 1px solid rgba(1, 117, 194, 0.3);
}

/* Code Blocks */
pre {
  background: #1a1a2e;
  border-radius: 16px;
  padding: 25px;
  overflow-x: auto;
  margin: 20px 0;
  border: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
}

pre::before {
  content: "Dart";
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 0.75rem;
  color: var(--dart-blue-light);
  background: rgba(1, 117, 194, 0.2);
  padding: 4px 10px;
  border-radius: 8px;
}

code {
  font-family: var(--font-code);
  font-size: 0.9rem;
  line-height: 1.7;
  color: #e0e0e0;
}

/* Inline code */
p code,
li code {
  background: rgba(1, 117, 194, 0.2);
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.9em;
  color: var(--dart-blue-light);
}

/* Syntax Highlighting */
.keyword {
  color: #ff79c6;
}
.string {
  color: #f1fa8c;
}
.number {
  color: #bd93f9;
}
.comment {
  color: #6272a4;
  font-style: italic;
}
.function {
  color: #50fa7b;
}
.class-name {
  color: #8be9fd;
}

/* Output Box */
.output-box {
  background: linear-gradient(
    135deg,
    rgba(80, 250, 123, 0.1),
    rgba(80, 250, 123, 0.05)
  );
  border: 1px solid rgba(80, 250, 123, 0.3);
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  font-family: var(--font-code);
  font-size: 0.95rem;
  color: #50fa7b;
}

/* Tip Box */
.tip-box {
  background: linear-gradient(
    135deg,
    rgba(255, 184, 108, 0.1),
    rgba(255, 184, 108, 0.05)
  );
  border: 1px solid rgba(255, 184, 108, 0.3);
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  color: #ffb86c;
}

/* Warning Box */
.warning-box {
  background: linear-gradient(
    135deg,
    rgba(255, 85, 85, 0.1),
    rgba(255, 85, 85, 0.05)
  );
  border: 1px solid rgba(255, 85, 85, 0.3);
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  color: #ff5555;
}

/* Rule Box */
.rule-box {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 25px;
  margin: 25px 0;
  border: 1px solid var(--border-color);
}

.rule-box h4 {
  color: var(--dart-blue-light);
  margin-bottom: 15px;
  font-size: 1.1rem;
}

.rule-box ul {
  list-style: none;
}

.rule-box ul li {
  padding: 8px 0;
  padding-left: 25px;
  position: relative;
}

.rule-box ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--dart-blue);
}

/* Info Grid */
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 25px;
}

.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 25px;
  text-align: center;
  transition: all var(--transition-fast);
}

.info-card:hover {
  border-color: var(--dart-blue);
  transform: translateY(-5px);
}

.info-card h4 {
  color: var(--dart-blue-light);
  margin-bottom: 10px;
  font-family: var(--font-code);
}

.info-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Comparison Box */
.comparison-box {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  margin: 30px 0;
  flex-wrap: wrap;
}

.compare-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 25px 35px;
  text-align: center;
}

.compare-item h4 {
  color: var(--dart-blue-light);
  margin-bottom: 15px;
  font-size: 1rem;
}

.compare-item code {
  color: #50fa7b;
  font-size: 1rem;
}

.compare-arrow {
  font-size: 2rem;
  color: var(--dart-blue);
}

/* Scope Types */
.scope-types {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 20px;
  margin-top: 30px;
}

.scope-item {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 25px;
  text-align: center;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}

.scope-item:hover {
  transform: translateY(-5px);
}

.scope-item.global {
  border-color: rgba(80, 250, 123, 0.3);
}
.scope-item.local {
  border-color: rgba(139, 233, 253, 0.3);
}
.scope-item.block {
  border-color: rgba(255, 121, 198, 0.3);
}

.scope-item h4 {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.scope-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Task Box (Homework) */
.task-box {
  background: linear-gradient(
    135deg,
    rgba(108, 99, 255, 0.1),
    rgba(108, 99, 255, 0.05)
  );
  border: 1px solid rgba(108, 99, 255, 0.3);
  border-radius: 16px;
  padding: 30px;
  margin-bottom: 25px;
}

.task-box h3 {
  color: #6c63ff;
  margin-bottom: 20px;
}

.task-box ul {
  list-style: none;
}

.task-box ul li {
  padding: 10px 0;
  padding-left: 25px;
  position: relative;
  color: var(--text-secondary);
}

.task-box ul li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: #6c63ff;
}

/* Summary Grid */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 25px;
  margin-bottom: 40px;
}

.summary-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 35px;
  text-align: center;
  transition: all var(--transition-fast);
}

.summary-card:hover {
  transform: translateY(-8px);
  border-color: var(--dart-blue);
  box-shadow: var(--shadow-glow);
}

.summary-card .icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.summary-card h3 {
  color: var(--text-primary);
  margin-bottom: 15px;
  font-size: 1.3rem;
}

.summary-card p {
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.summary-card .benefit {
  color: #50fa7b;
  font-size: 0.9rem;
  margin-top: 15px;
}

.summary-card.hof {
  border-top: 3px solid #0175c2;
}
.summary-card.anon {
  border-top: 3px solid #13b9fd;
}
.summary-card.scope {
  border-top: 3px solid #0553b1;
}

.final-message {
  text-align: center;
  padding: 40px;
  background: var(--dart-gradient);
  border-radius: 20px;
  margin-top: 30px;
}

.final-message h3 {
  font-size: 2rem;
  margin-bottom: 15px;
}

.final-message p {
  font-size: 1.1rem;
  opacity: 0.9;
}

/* Syntax Box */
.syntax-box {
  background: var(--bg-card);
  border-radius: 16px;
  padding: 25px;
  margin-top: 25px;
  border: 1px solid var(--border-color);
  text-align: left;
}

.syntax-box h4 {
  color: var(--dart-blue-light);
  margin-bottom: 15px;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }

  .topics-grid {
    grid-template-columns: 1fr;
  }

  .topic-card {
    padding: 30px 25px;
  }

  .slide-header {
    padding: 15px 20px;
    flex-wrap: wrap;
    gap: 15px;
  }

  .slide-header .progress-info {
    width: 100%;
    justify-content: center;
  }

  .progress-bar {
    width: 100%;
  }

  .slide-content-area {
    padding: 20px;
  }

  .slide-content .slide-body {
    padding: 25px;
  }

  .slide-content .slide-title h1 {
    font-size: 1.8rem;
  }

  .info-grid {
    grid-template-columns: 1fr;
  }

  .comparison-box {
    flex-direction: column;
  }

  .compare-arrow {
    transform: rotate(90deg);
  }

  .nav-btn {
    padding: 12px 20px;
    font-size: 0.9rem;
  }

  pre {
    padding: 15px;
    font-size: 0.8rem;
  }
}

/* ==================== KEYBOARD HINT ==================== */
.keyboard-hint {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--bg-glass);
  border: 1px solid var(--border-color);
  padding: 10px 20px;
  border-radius: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  display: none;
}

.slide-viewer.active .keyboard-hint {
  display: block;
}

.keyboard-hint kbd {
  background: var(--bg-card);
  padding: 4px 10px;
  border-radius: 6px;
  margin: 0 3px;
  border: 1px solid var(--border-color);
}

/* ==================== SCROLLBAR ==================== */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--dart-blue);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--dart-blue-light);
}

@media (max-width: 900px) {
  .objective-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 560px) {
  .objective-grid {
    grid-template-columns: 1fr;
  }
}