/* ==========================================================================
   Base Styles - Reset, Typography, Global Elements
   ========================================================================== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  line-height: 1.55;
  min-height: 100vh;
}

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

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

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

/* Typography scale ------------------------------------------------------ */
.page-title {
  font-size: var(--font-size-page-title);
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.section-title {
  font-size: var(--font-size-section-title);
  font-weight: 700;
  color: var(--color-text-primary);
}

.card-title-text {
  font-size: var(--font-size-card-title);
  font-weight: 600;
  color: var(--color-text-primary);
}

.text-body {
  font-size: var(--font-size-body);
}

.text-small {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
}

.form-label,
.label-text {
  font-size: var(--font-size-label);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.helper-text {
  font-size: var(--font-size-helper);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.error-text {
  font-size: var(--font-size-helper);
  color: var(--color-danger);
  margin-top: var(--space-1);
  display: flex;
  align-items: center;
  gap: 4px;
}

.required-mark {
  color: var(--color-danger);
  margin-left: 2px;
}

/* Focus visibility for accessibility ------------------------------------ */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

/* Scrollbar (subtle, non-intrusive) -------------------------------------- */
::-webkit-scrollbar {
  height: 8px;
  width: 8px;
}

::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: var(--border-radius-pill);
}

/* Skip link for keyboard users ------------------------------------------ */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: var(--color-text-inverse);
  padding: 8px 16px;
  z-index: 2000;
  border-radius: 0 0 var(--border-radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}