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

:root {
  color-scheme: light dark;
  --color-bg: #f9fafb;
  --color-bg-alt: #ffffff;
  --color-surface: #ffffff;
  --color-surface-muted: #e5e7eb;
  --color-text: #0f172a;
  --color-text-muted: #6b7280;
  --color-accent: #2563eb;
  --color-border: #e5e7eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #020617;
    --color-bg-alt: #020617;
    --color-surface: #020617;
    --color-surface-muted: #0f172a;
    --color-text: #e5e7eb;
    --color-text-muted: #9ca3af;
    --color-accent: #3b82f6;
    --color-border: #1f2937;
  }
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  font-size: 1.25rem;
  color: var(--color-text-muted);
}

/* Container utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  text-decoration: none;
  border: none;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
  .btn-primary:hover {
    background-color: #2563eb;
  }
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn-outline:hover {
  background-color: var(--color-accent);
  color: #ffffff;
}

/* Section styles */
.section {
  padding: 4rem 0;
}

.section-dark {
  background-color: var(--color-surface-muted);
  color: var(--color-text);
}

/* Typography */
h1, h2, h3 {
  font-weight: 700;
  line-height: 1.2;
}

/* Form styles */
input, textarea, select {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: 1rem;
  border: 2px solid var(--color-border);
  border-radius: 8px;
  background-color: var(--color-surface);
  color: var(--color-text);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-accent);
}

/* Card styles */
.card {
  background-color: var(--color-surface);
  border-radius: 16px;
  padding: 2rem;
  border: 1px solid var(--color-border);
}

/* Grid utilities */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

@media (max-width: 768px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
}