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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  flex: 1;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 5vw, var(--font-size-4xl)); font-weight: 400; }
h2 { font-size: clamp(1.5rem, 3.5vw, var(--font-size-3xl)); font-weight: 400; }
h3 { font-size: clamp(1.25rem, 2.5vw, var(--font-size-2xl)); }
h4 { font-size: var(--font-size-xl); font-family: var(--font-family); font-weight: var(--font-weight-semibold); }
h5 { font-size: var(--font-size-lg); font-family: var(--font-family); }
h6 { font-size: var(--font-size-md); font-family: var(--font-family); }

p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
  line-height: var(--line-height);
}

p:last-child {
  margin-bottom: 0;
}

ul, ol {
  list-style: none;
}

input, textarea, select, button {
  font-family: inherit;
  font-size: inherit;
}

::selection {
  background: var(--color-primary-200);
  color: var(--color-primary-darker);
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* ──── Container ──── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem);
}

/* ──── Screen reader only ──── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}