:root {
  /* Dark Mode Variables */
  --bg-body: #09090b;
  --bg-card: #18181b;
  --bg-input: #27272a;
  --text-main: #fafafa;
  --text-muted: #a1a1aa;
  --border: #3f3f46;
  --primary: #3b82f6;
  --primary-glow: rgba(59, 130, 246, 0.5);
  --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  
  /* Spacing & Layout */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--space-md);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; margin-bottom: var(--space-lg); border-bottom: 1px solid var(--border); padding-bottom: var(--space-sm); }
h3 { font-size: 1.1rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; font-size: 0.875rem; margin-bottom: var(--space-md); }

p {
  color: var(--text-muted);
  margin-bottom: var(--space-md);
}

/* Layout */
.container {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.main-content {
  flex: 1;
  padding: var(--space-xl) 0;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: var(--space-md) 0;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-main);
  text-decoration: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-link:hover {
  color: var(--text-main);
}

/* Card */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: 0 10px 40px -10px rgba(0,0,0,0.5);
}

/* Forms */
.form-section {
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--text-main);
}

.form-input, .form-select {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text-main);
  font-size: 1rem;
  transition: all 0.2s ease;
  outline: none;
}

.form-input:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

/* Custom File Upload */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
  background: rgba(255, 255, 255, 0.02);
  cursor: pointer;
  transition: all 0.2s;
}

.upload-zone:hover {
  border-color: var(--primary);
  background: rgba(59, 130, 246, 0.05);
}

.upload-icon {
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.upload-text {
  font-size: 0.875rem;
  color: var(--text-muted);
}

.upload-text strong {
  color: var(--primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
  font-size: 1rem;
}

.btn-primary {
  background: var(--accent-gradient);
  color: white;
  box-shadow: 0 4px 14px var(--primary-glow);
  width: 100%;
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 8px 16px;
  font-size: 0.875rem;
}

.btn-outline:hover {
  border-color: var(--text-muted);
  background: rgba(255,255,255,0.05);
}

/* Utility */
.text-center { text-align: center; }
.mb-4 { margin-bottom: var(--space-lg); }
.mt-4 { margin-top: var(--space-lg); }