/* ── Base ── */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-family-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
    padding-top: 80px; /* clearance for fixed header */
}

/* ── Container ── */
.container {
    width: 100%;
    max-width: 1280px;
    margin-inline: auto;
    padding-inline: var(--space-6);
}

@media (max-width: 767px) {
    .container {
        padding-inline: var(--space-4);
    }
}

/* ── Capabilities Grid ── */
.capabilities-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
}

@media (max-width: 1279px) {
    .capabilities-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {
    .capabilities-grid {
        grid-template-columns: 1fr;
    }
}

/* ── Flexbox Utilities ── */
.flex          { display: flex; }
.flex-col      { flex-direction: column; }
.flex-wrap     { flex-wrap: wrap; }
.items-center  { align-items: center; }
.items-start   { align-items: flex-start; }
.items-end     { align-items: flex-end; }
.justify-center  { justify-content: center; }
.justify-between { justify-content: space-between; }
.justify-end     { justify-content: flex-end; }
.gap-2   { gap: var(--space-2); }
.gap-4   { gap: var(--space-4); }
.gap-6   { gap: var(--space-6); }
.gap-8   { gap: var(--space-8); }

/* ── Grid Utilities ── */
.grid     { display: grid; }
.grid-2   { grid-template-columns: repeat(2, 1fr); }
.grid-3   { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 767px) {
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ── Spacing Utilities ── */
.mt-auto { margin-top: auto; }
.mb-auto { margin-bottom: auto; }
.text-center { text-align: center; }
.text-left   { text-align: left; }

/* ── Width Utilities ── */
.w-full   { width: 100%; }
.max-w-sm { max-width: 480px; }
.max-w-md { max-width: 640px; }
.max-w-lg { max-width: 768px; }
.max-w-xl { max-width: 1024px; }

/* ── Section Spacing ── */
.section {
    padding-block: var(--space-24);
}

.section--sm {
    padding-block: var(--space-16);
}

.section--lg {
    padding-block: var(--space-32);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-header h2 {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    margin-bottom: var(--space-4);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--color-text-muted);
    max-width: 600px;
    margin-inline: auto;
}

@media (max-width: 767px) {
    .section {
        padding-block: var(--space-16);
    }
    .section-header h2 {
        font-size: var(--font-size-2xl);
    }
}

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

.skip-link {
    position: absolute;
    top: -40px;
    left: var(--space-4);
    z-index: calc(var(--z-nav) + 10);
    background: var(--color-gradient-start);
    color: #fff;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-semibold);
    transition: top 150ms ease;
}

.skip-link:focus {
    top: var(--space-4);
}

/* ── Focus Visible ── */
:focus-visible {
    outline: 2px solid var(--color-gradient-start);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ── Gradient Text ── */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ── Divider ── */
.divider {
    width: 64px;
    height: 4px;
    background: var(--gradient-brand);
    border-radius: var(--radius-full);
    margin-block: var(--space-6);
}

.divider--center {
    margin-inline: auto;
}