:root {
  --primary: #6c63ff;
  --primary-dark: #554fd8;
  --secondary: #ff6584;
  --accent: #36d1dc;
  --dark-bg: #0f172a;
  --dark-card: #1e293b;
  --dark-border: #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --success: #10b981;
  --warning: #f59e0b;
  --level0-color: #3b82f6;
  --level1-color: #8b5cf6;
}

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

body {
  font-family: "Poppins", sans-serif;
  background-color: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

.code-font {
  font-family: "JetBrains Mono", monospace;
}

/* Header & Navigation */
header {
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--dark-border);
  padding: 1rem 0;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 2rem;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-icon {
  width: 50px;
  height: 50px;
  /* background: linear-gradient(135deg, var(--primary), var(--accent)); */
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.5rem;
  color: white;
}

.logo-text h1 {
  font-size: 1.8rem;
  background: linear-gradient(to right, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.logo-text span {
  color: var(--secondary);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s;
  padding: 0.5rem 0;
  position: relative;
}

.nav-links a:hover {
  color: var(--primary);
}

.nav-links a.active {
  color: var(--primary);
}

.nav-links a.active::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--primary);
  border-radius: 3px;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Main Layout */
.main-layout {
  display: flex;
  gap: 2rem;
  padding: 2rem 0;
}

.content-section {
  flex: 1;
  padding-right: 1rem;
}

.sidebar {
  width: 350px;
  flex-shrink: 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 3rem 0;
  background: linear-gradient(135deg,
      rgba(108, 99, 255, 0.1),
      rgba(54, 209, 220, 0.1));
  border-radius: 20px;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%236c63ff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.hero h2 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
  position: relative;
}

.hero p {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 2rem;
  position: relative;
}

.hero-buttons {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
  position: relative;
  flex-wrap: wrap;
}

.btn {
  padding: 0.8rem 1.8rem;
  border-radius: 50px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-secondary {
  background: var(--dark-card);
  color: var(--text-primary);
  border: 1px solid var(--dark-border);
}

.btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

/* Collapsible Section Headers */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  padding: 1.2rem 1.5rem;
  border-radius: 15px;
  background-color: var(--dark-card);
  border: 1px solid var(--dark-border);
  cursor: pointer;
  transition: all 0.3s;
  position: relative;
}

.section-header:hover {
  border-color: var(--primary);
  box-shadow: 0 5px 15px rgba(108, 99, 255, 0.1);
}

.section-header h2 {
  font-size: 1.8rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.section-header h2 i {
  color: var(--primary);
}

.level-indicator {
  padding: 0.5rem 1rem;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 600;
}

.level0-indicator {
  background: rgba(59, 130, 246, 0.2);
  color: var(--level0-color);
  border: 1px solid var(--level0-color);
}

.level1-indicator {
  background: rgba(139, 92, 246, 0.2);
  color: var(--level1-color);
  border: 1px solid var(--level1-color);
}

.collapse-icon {
  transition: transform 0.3s ease;
  color: var(--primary);
  font-size: 1.2rem;
}

.section-header.collapsed .collapse-icon {
  transform: rotate(-90deg);
}

/* Weeks Grid */
.weeks-container {
  overflow: hidden;
  transition: max-height 0.5s ease;
  margin-bottom: 2rem;
}

.weeks-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.week-card {
  background-color: var(--dark-card);
  border-radius: 15px;
  padding: 1.8rem;
  border: 1px solid var(--dark-border);
  transition: all 0.3s;
  position: relative;
  overflow: hidden;
}

.week-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  border-color: var(--primary);
}

.week-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
}

.level0-card::before {
  background: var(--level0-color);
}

.level1-card::before {
  background: var(--level1-color);
}

.week-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}

.week-title {
  font-size: 1.4rem;
  font-weight: 600;
}

.week-tag {
  padding: 0.3rem 0.8rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
}

.level0-tag {
  background: rgba(59, 130, 246, 0.2);
  color: var(--level0-color);
}

.level1-tag {
  background: rgba(139, 92, 246, 0.2);
  color: var(--level1-color);
}

.week-materials {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.material-link {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.8rem;
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  text-decoration: none;
  color: var(--text-secondary);
  transition: all 0.3s;
}

.material-link:hover {
  background-color: rgba(108, 99, 255, 0.2);
  color: var(--primary);
  transform: translateX(5px);
}

.material-link i {
  width: 20px;
  text-align: center;
}

/* Sidebar */
.sidebar-card {
  background-color: var(--dark-card);
  border-radius: 15px;
  padding: 2rem;
  margin-bottom: 2rem;
  border: 1px solid var(--dark-border);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--dark-border);
}

.sidebar-header h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.3rem;
}

.slide-controls {
  display: flex;
  gap: 0.5rem;
}

.slide-btn {
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(108, 99, 255, 0.2);
  color: var(--primary);
  border: none;
  cursor: pointer;
  transition: all 0.3s;
}

.slide-btn:hover {
  background: var(--primary);
  color: white;
}

/* Top Performers */
.top-performers {
  position: relative;
  min-height: 400px;
  overflow: hidden;
}

.slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.5s, visibility 0.5s;
}

.slide.active {
  opacity: 1;
  visibility: visible;
  position: relative;
}

.slide-title {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
  text-align: center;
  padding: 0.5rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.05);
}

.level0-slide .slide-title {
  border-left: 4px solid var(--level0-color);
}

.level1-slide .slide-title {
  border-left: 4px solid var(--level1-color);
}

.performer-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.performer {
  display: flex;
  align-items: center;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  transition: all 0.3s;
}

.performer:hover {
  background: rgba(108, 99, 255, 0.15);
  transform: translateX(5px);
}

.rank {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-weight: 700;
  margin-right: 1rem;
  flex-shrink: 0;
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-primary);
}

.rank-1 {
  background: linear-gradient(135deg, #ffd700, #ffa500);
  color: #000;
}

.rank-2 {
  background: linear-gradient(135deg, #c0c0c0, #a0a0a0);
  color: #000;
}

.rank-3 {
  background: linear-gradient(135deg, #cd7f32, #a6692a);
  color: #000;
}

.performer-info h4 {
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

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

.score {
  margin-left: auto;
  font-weight: 700;
  color: var(--primary);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  justify-content: center;
  align-items: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal.active {
  display: flex;
  opacity: 1;
}

.modal-content {
  background-color: var(--dark-card);
  border-radius: 20px;
  width: 90%;
  max-width: 500px;
  border: 1px solid var(--dark-border);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transform: translateY(-20px);
  transition: transform 0.3s ease;
}

.modal.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--dark-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.5rem;
  cursor: pointer;
  transition: color 0.3s;
}

.modal-close:hover {
  color: var(--primary);
}

.modal-body {
  padding: 2rem;
}

.modal-buttons {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.sheet-btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.2rem 1.5rem;
  border-radius: 12px;
  text-decoration: none;
  color: white;
  font-weight: 600;
  transition: all 0.3s;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
}

.sheet-btn.level0-btn {
  background: linear-gradient(135deg, var(--level0-color), #1d4ed8);
}

.sheet-btn.level1-btn {
  background: linear-gradient(135deg, var(--level1-color), #7c3aed);
}

.sheet-btn:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
}

.sheet-btn i:first-child {
  font-size: 1.3rem;
}

.sheet-btn .arrow {
  opacity: 0.8;
  transition: transform 0.3s;
}

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

.modal-footer {
  padding: 1rem 2rem;
  border-top: 1px solid var(--dark-border);
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Footer */
footer {
  background-color: rgba(15, 23, 42, 0.95);
  border-top: 1px solid var(--dark-border);
  padding: 3rem 0 2rem;
  margin-top: 3rem;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-section h3 {
  font-size: 1.3rem;
  margin-bottom: 1.5rem;
  color: var(--primary);
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
}

.footer-links a:hover {
  color: var(--primary);
  transform: translateX(5px);
}

.copyright {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--dark-border);
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Top Performers Button */
.top-performers-btn {
  margin-top: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

/* Responsive Design */
@media (max-width: 1200px) {
  .main-layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }

  .content-section {
    padding-right: 0;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--dark-card);
    flex-direction: column;
    padding: 1rem;
    border-top: 1px solid var(--dark-border);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }

  .hero h2 {
    font-size: 2rem;
  }

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

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 80%;
    justify-content: center;
  }

  .modal-content {
    width: 95%;
  }

  .sheet-btn {
    padding: 1rem 1.2rem;
    font-size: 1rem;
  }
}

@media (max-width: 767px) {
  .logo-text h1 {
    font-size: 1.25rem;
  }
}