/* ========================================
   DART WEB PPT - STYLE.CSS
   Modern Dark Theme with Glassmorphism
======================================== */

:root {
  --dart-blue: #0175c2;
  --dart-light-blue: #13b9fd;
  --dart-dark: #0d47a1;
  --bg-primary: #0a0a1a;
  --bg-secondary: #12122a;
  --bg-card: rgba(255, 255, 255, 0.05);
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --accent-gradient: linear-gradient(135deg, #0175c2, #13b9fd);
  --glass-bg: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.15);
  --code-bg: #1e1e3f;
  --success: #4ade80;
  --warning: #fbbf24;
  --error: #f87171;
}

@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;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Poppins", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  background-image:
    radial-gradient(
      ellipse at 20% 20%,
      rgba(1, 117, 194, 0.15) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 80% 80%,
      rgba(19, 185, 253, 0.1) 0%,
      transparent 50%
    ),
    radial-gradient(
      ellipse at 50% 50%,
      rgba(13, 71, 161, 0.1) 0%,
      transparent 70%
    );
}

code {
  font-family: "Fira Code", monospace;
  background: var(--code-bg);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--dart-light-blue);
}

/* ========================================
   FLOATING DART ICONS
======================================== */

.floating-icons {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.float-icon {
  position: absolute;
  opacity: 0.08;
  animation: float 20s ease-in-out infinite;
}

.icon-1 {
  width: 120px;
  top: 10%;
  left: 5%;
  animation-delay: 0s;
}

.icon-2 {
  width: 80px;
  top: 60%;
  right: 10%;
  animation-delay: -5s;
}

.icon-3 {
  width: 100px;
  bottom: 15%;
  left: 15%;
  animation-delay: -10s;
}

.icon-4 {
  width: 60px;
  top: 30%;
  right: 20%;
  animation-delay: -15s;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0) rotate(0deg);
  }
  25% {
    transform: translateY(-20px) rotate(5deg);
  }
  50% {
    transform: translateY(0) rotate(0deg);
  }
  75% {
    transform: translateY(20px) rotate(-5deg);
  }
}

/* ========================================
   LANDING PAGE
======================================== */

.landing {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 40px 20px;
  position: relative;
  z-index: 1;
}

.landing.active {
  display: flex;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.landing-header {
  text-align: center;
  margin-bottom: 50px;
}

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

@keyframes pulse {
  0%,
  100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.landing-header h1 {
  font-size: 3.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
  text-shadow: 0 0 40px rgba(1, 117, 194, 0.3);
}

.subtitle {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 300;
}

/* ========================================
   TOPICS GRID
======================================== */

.topics-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
  max-width: 1200px;
  width: 100%;
  padding: 0 20px;
}

.topic-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  padding: 35px 30px;
  cursor: pointer;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  overflow: hidden;
}

.topic-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.topic-card:hover {
  transform: translateY(-10px) scale(1.02);
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--dart-blue);
  box-shadow:
    0 20px 40px rgba(0, 0, 0, 0.3),
    0 0 30px rgba(1, 117, 194, 0.2);
}

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

.card-icon {
  font-size: 3rem;
  margin-bottom: 15px;
}

.topic-card h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.topic-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 15px;
}

.slide-count {
  display: inline-block;
  background: var(--accent-gradient);
  padding: 5px 15px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
}

.project-card {
  grid-column: span 1;
}

.topics-grid .topic-card:nth-child(4) {
  grid-column: 1 / 2;
}

.topics-grid .topic-card:nth-child(5) {
  grid-column: 3 / 4;
}

/* ========================================
   LANDING FOOTER
======================================== */

.landing-footer {
  margin-top: 50px;
  display: flex;
  align-items: center;
  gap: 15px;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer-logo {
  width: 30px;
  opacity: 0.7;
}

/* ========================================
   SLIDES CONTAINER
======================================== */

.slides-container {
  display: none;
  flex-direction: column;
  min-height: 100vh;
  position: relative;
  z-index: 1;
}

.slides-container.active {
  display: flex;
  animation: slideIn 0.5s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(50px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ========================================
   SLIDES NAVIGATION
======================================== */

.slides-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: "Poppins", sans-serif;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.nav-btn:hover {
  background: var(--dart-blue);
  border-color: var(--dart-blue);
}

.topic-title {
  font-size: 1.3rem;
  font-weight: 600;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.slide-progress {
  font-size: 1rem;
  color: var(--text-secondary);
}

.slide-progress span:first-child {
  color: var(--dart-light-blue);
  font-weight: 600;
}

/* ========================================
   SLIDES WRAPPER
======================================== */

.slides-wrapper {
  flex: 1;
  display: flex;
  overflow: hidden;
  padding: 40px;
}

.slide {
  min-width: 100%;
  display: none;
  flex-direction: column;
  gap: 25px;
  animation: fadeSlide 0.4s ease;
}

.slide.active {
  display: flex;
}

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

.slide-header {
  text-align: center;
  margin-bottom: 20px;
}

.slide-header h2 {
  font-size: 2.2rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}

.slide-header p {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

/* ========================================
   SLIDE CONTENT
======================================== */

.slide-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

.slide-content.full-width {
  grid-template-columns: 1fr;
}

.content-box {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 15px;
  padding: 25px;
  transition: all 0.3s ease;
}

.content-box:hover {
  border-color: var(--dart-blue);
}

.content-box h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--dart-light-blue);
  display: flex;
  align-items: center;
  gap: 10px;
}

.content-box p,
.content-box li {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.content-box ul {
  list-style: none;
  padding-left: 0;
}

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

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

/* ========================================
   CODE BLOCK
======================================== */

.code-block {
  background: var(--code-bg);
  border-radius: 12px;
  padding: 20px;
  overflow-x: auto;
  position: relative;
}

.code-block::before {
  content: "Dart";
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 0.75rem;
  color: var(--dart-light-blue);
  background: rgba(19, 185, 253, 0.15);
  padding: 3px 10px;
  border-radius: 5px;
  font-weight: 500;
}

.code-block pre {
  margin: 0;
  font-family: "Fira Code", monospace;
  font-size: 0.9rem;
  line-height: 1.7;
  color: #e0e0e0;
}

/* Syntax Highlighting */
.keyword {
  color: #c792ea;
}
.type {
  color: #ffcb6b;
}
.string {
  color: #c3e88d;
}
.number {
  color: #f78c6c;
}
.comment {
  color: #546e7a;
  font-style: italic;
}
.function {
  color: #82aaff;
}
.operator {
  color: #89ddff;
}

/* ========================================
   SLIDES CONTROLS
======================================== */

.slides-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--glass-border);
}

.control-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 25px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: "Poppins", sans-serif;
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
}

.control-btn:hover {
  background: var(--dart-blue);
  border-color: var(--dart-blue);
  transform: translateX(5px);
}

.prev-btn:hover {
  transform: translateX(-5px);
}

.control-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.control-btn:disabled:hover {
  background: var(--glass-bg);
  transform: none;
}

.progress-bar {
  flex: 1;
  max-width: 400px;
  height: 6px;
  background: var(--glass-bg);
  border-radius: 10px;
  margin: 0 30px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 10px;
  transition: width 0.4s ease;
}

/* ========================================
   PROJECT CARDS IN SLIDES
======================================== */

.project-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 25px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.project-item {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 15px;
  padding: 30px;
  transition: all 0.3s ease;
}

.project-item:hover {
  border-color: var(--dart-blue);
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.project-item h4 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--dart-light-blue);
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.project-item .requirements {
  margin-top: 15px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
}

.project-item .requirements h5 {
  font-size: 0.9rem;
  color: var(--warning);
  margin-bottom: 10px;
}

.output-preview {
  margin-top: 15px;
  background: var(--code-bg);
  border-radius: 10px;
  padding: 15px;
  font-family: "Fira Code", monospace;
  font-size: 0.8rem;
  color: #a0a0a0;
  white-space: pre;
  overflow-x: auto;
}

/* ========================================
   RESPONSIVE DESIGN
======================================== */

@media (max-width: 1024px) {
  .topics-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .topics-grid .topic-card:nth-child(4),
  .topics-grid .topic-card:nth-child(5) {
    grid-column: auto;
  }

  .slide-content {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 768px) {
  .landing-header h1 {
    font-size: 2.5rem;
  }

  .topics-grid {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .slides-nav {
    padding: 15px 20px;
    flex-wrap: wrap;
    gap: 10px;
  }

  .topic-title {
    order: -1;
    width: 100%;
    text-align: center;
  }

  .slides-wrapper {
    padding: 20px;
  }

  .slide-header h2 {
    font-size: 1.6rem;
  }

  .slides-controls {
    padding: 15px 20px;
  }

  .control-btn span {
    display: none;
  }

  .progress-bar {
    margin: 0 15px;
  }
}

@media (max-width: 480px) {
  .landing-header h1 {
    font-size: 2rem;
  }

  .main-logo {
    width: 70px;
  }

  .topic-card {
    padding: 25px 20px;
  }

  .card-icon {
    font-size: 2.5rem;
  }
}

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

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