/* css/style.css */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
:root {
  /* Light mode */
  --primary: #4361ee;
  --secondary: #3f37c9;
  --success: #4cc9f0;
  --light: #f8f9fa;
  --dark: #212529;
  --gray: #6c757d;
  --light-gray: #e9ecef;
  --border: #dee2e6;
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --transition: all 0.3s ease;

  /* Dark mode (light blue theme) */
  --dark-bg: #0a1929;
  --dark-card: #12283a;
  --dark-accent: #2a4d69;
  --dark-border: #1e3a5f;
  --dark-text: #e0f0ff;
  --dark-gray: #a0c0d9;
  --dark-primary: #4cc9f0;
  --dark-secondary: #3ab0d9;
  --dark-success: #72efdd;
}

.dark-mode {
  --light: var(--dark-bg);
  --dark: var(--dark-text);
  --gray: var(--dark-gray);
  --light-gray: var(--dark-card);
  --border: var(--dark-border);
  --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.25);
  --primary: var(--dark-primary);
  --secondary: var(--dark-secondary);
  --success: var(--dark-success);
}

body {
  background: var(--light);
  color: var(--dark);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  overflow-x: hidden;
}

/* Header */
header {
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: var(--light);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.logo i {
  font-size: 1.5rem;
  color: var(--primary);
  background: var(--light);
  padding: 6px;
  border-radius: 50%;
  box-shadow: 0 2px 6px rgba(67, 97, 238, 0.2);
}
.logo h1 {
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.theme-toggle {
  background: var(--light-gray);
  border: none;
  width: 48px;
  height: 26px;
  border-radius: 13px;
  position: relative;
  cursor: pointer;
  transition: var(--transition);
}
.theme-toggle::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--primary);
  top: 3px;
  left: 3px;
  transition: var(--transition);
}
.dark-mode .theme-toggle::before {
  transform: translateX(22px);
  background: var(--success);
}

/* Navigation */
nav {
  display: flex;
  justify-content: center;
  gap: 1.2rem;
  margin: 1.5rem 0;
  flex-wrap: wrap;
}
nav a {
  text-decoration: none;
  color: var(--gray);
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  transition: var(--transition);
}
nav a:hover, nav a.active {
  color: var(--primary);
  background: var(--light-gray);
}
.dark-mode nav a:hover, .dark-mode nav a.active {
  background: rgba(76, 201, 240, 0.1);
}

/* Main Content */
main {
  flex: 1;
  padding: 2rem;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

/* Cards */
.card {
  background: var(--light-gray);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
  margin-bottom: 2rem;
}

/* Buttons */
.btn {
  padding: 0.7rem 1.5rem;
  border: none;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: white;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(67, 97, 238, 0.3);
}
.btn-outline {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}
.dark-mode .btn-outline {
  border-color: var(--success);
  color: var(--success);
}

/* Footer */
footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--gray);
  font-size: 0.9rem;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.powered-by {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.team-ceylon {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Responsive */
@media (max-width: 768px) {
  header {
    padding: 1rem;
  }
  .logo h1 {
    font-size: 1.4rem;
  }
  nav {
    gap: 0.5rem;
  }
  nav a {
    padding: 0.4rem 0.8rem;
    font-size: 0.95rem;
  }
  main {
    padding: 1.5rem;
  }
}