/* System Design System & Variables */
:root {
  --font-sans: 'Inter', sans-serif;

  /* Theme: Dark (Default) */
  --bg-app: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.45);
  --bg-card-hover: rgba(30, 41, 59, 0.7);
  --border-color: rgba(255, 255, 255, 0.08);
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --primary: #38bdf8;
  --primary-hover: #0ea5e9;
  --secondary: #6366f1;
  --secondary-hover: #4f46e5;
  
  --card-blur: blur(16px);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
  --shadow-card-hover: 0 20px 40px rgba(56, 189, 248, 0.12);
  --transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
body.light-theme {
  --bg-app: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.65);
  --bg-card-hover: rgba(255, 255, 255, 0.9);
  --border-color: rgba(15, 23, 42, 0.08);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --secondary: #4f46e5;
  --secondary-hover: #3730a3;
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-card-hover: 0 20px 40px rgba(2, 132, 199, 0.1);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color 0.4s ease, color 0.4s ease;
  overflow-x: hidden;
}

/* App Container Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

/* Header */
.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

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

.header-logo-icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-size: 1.5rem;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.logo-area h1 {
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: 1px;
  background: linear-gradient(to right, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  line-height: 1.2;
}

.logo-area p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Theme Toggle Button */
.btn-icon {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  width: 44px;
  height: 44px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1.25rem;
  backdrop-filter: var(--card-blur);
  -webkit-backdrop-filter: var(--card-blur);
}

.btn-icon:hover {
  transform: translateY(-2px);
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.25);
}

/* Main Grid Layout for Hub Menu */
.menu-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin: auto 0;
  padding: 1.5rem 0;
}

@media (max-width: 968px) {
  .menu-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* Menu Card Styles */
.menu-card {
  position: relative;
  background-color: var(--bg-card);
  backdrop-filter: var(--card-blur);
  -webkit-backdrop-filter: var(--card-blur);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  padding: 2.5rem 2rem;
  text-decoration: none;
  color: var(--text-primary);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  cursor: pointer;
}

.menu-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0;
  transition: var(--transition);
}

.menu-card:hover {
  transform: translateY(-8px);
  border-color: rgba(56, 189, 248, 0.35);
  background-color: var(--bg-card-hover);
  box-shadow: var(--shadow-card-hover);
}

.menu-card:hover::before {
  opacity: 1;
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(56, 189, 248, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
  opacity: 0;
  transition: var(--transition);
  pointer-events: none;
}

.menu-card:hover .card-glow {
  opacity: 1;
}

/* Card Icon */
.card-icon-wrapper {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.1), rgba(99, 102, 241, 0.1));
  border: 1px solid rgba(56, 189, 248, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  color: var(--primary);
  transition: var(--transition);
  margin-bottom: 0.5rem;
}

.menu-card:hover .card-icon-wrapper {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
  transform: scale(1.05) rotate(3deg);
  box-shadow: 0 8px 20px rgba(56, 189, 248, 0.25);
  border-color: transparent;
}

/* Card Typography */
.menu-card h2 {
  font-size: 1.4rem;
  font-weight: 700;
  line-height: 1.3;
  transition: var(--transition);
}

.menu-card:hover h2 {
  color: var(--primary);
}

.menu-card p {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.6;
  flex-grow: 1;
}

/* Card Action Link Styling */
.card-action {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: var(--transition);
  margin-top: 0.5rem;
}

.card-action i {
  transition: var(--transition);
}

.menu-card:hover .card-action {
  color: var(--text-primary);
}

.menu-card:hover .card-action i {
  transform: translateX(4px);
}

/* Footer Styling */
.app-footer {
  text-align: center;
  margin-top: auto;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* Animations */
.animate-fade-in {
  animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.animate-fade-in-delay-1 {
  animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.15s forwards;
  opacity: 0;
}

.animate-fade-in-delay-2 {
  animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.3s forwards;
  opacity: 0;
}

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