/* ==========================================================================
   Reset + document defaults
   ========================================================================== */

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

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

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-normal);
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    margin: 0;
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    color: var(--color-text);
    letter-spacing: -0.01em;
}

h1 { font-size: var(--text-xl); }
h2 { font-size: var(--text-lg); }
h3 { font-size: var(--text-md); }
h4 { font-size: var(--text-base); }
h5, h6 { font-size: var(--text-sm); }

p {
    margin: 0 0 var(--space-3);
}

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

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

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

img {
    max-width: 100%;
    height: auto;
    vertical-align: middle;
}

hr {
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: var(--space-6) 0;
}

code, pre {
    font-family: var(--font-mono);
    font-size: 0.9em;
}

/* Focus: always visible, never removed. */
:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ---- Utility ------------------------------------------------------------ */

.u-visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.u-skip-link {
    position: absolute;
    top: var(--space-2);
    left: var(--space-2);
    z-index: 200;
    padding: var(--space-2) var(--space-4);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    transform: translateY(-200%);
    transition: transform var(--transition-fast);
}

.u-skip-link:focus {
    transform: translateY(0);
}

.u-text-right { text-align: right; }
.u-text-center { text-align: center; }
.u-text-muted { color: var(--color-text-muted); }
.u-text-secondary { color: var(--color-text-secondary); }
.u-numeric {
    font-variant-numeric: tabular-nums;
    text-align: right;
    white-space: nowrap;
}
.u-nowrap { white-space: nowrap; }
.u-capitalize { text-transform: capitalize; }
.u-mt-0 { margin-top: 0; }
.u-mt-4 { margin-top: var(--space-4); }
.u-mt-6 { margin-top: var(--space-6); }
.u-mb-0 { margin-bottom: 0; }
.u-mb-4 { margin-bottom: var(--space-4); }
.u-mb-6 { margin-bottom: var(--space-6); }
.u-flex { display: flex; }
.u-flex-wrap { flex-wrap: wrap; }
.u-items-center { align-items: center; }
.u-justify-between { justify-content: space-between; }
.u-gap-2 { gap: var(--space-2); }
.u-gap-3 { gap: var(--space-3); }
.u-gap-4 { gap: var(--space-4); }
.u-full-width { width: 100%; }

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}