/* ============================================================
   Base — reset, elements, container, buttons.
   Layout/component styles live in layout.css.
   ============================================================ */

/* --- Modern reset --- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body {
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    line-height: var(--lh-base);
    color: var(--c-text);
    background: var(--c-bg);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    min-height: 100vh;
}

img, picture, svg, video { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
p, h1, h2, h3, h4 { overflow-wrap: break-word; }

/* --- Headings --- */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    color: var(--c-ink);
    line-height: var(--lh-tight);
    font-weight: var(--fw-bold);
    letter-spacing: -0.02em;
}
h1 { font-size: var(--fs-2xl); }
h2 { font-size: var(--fs-xl); }
h3 { font-size: var(--fs-lg); line-height: var(--lh-snug); }
h4 { font-size: var(--fs-md); font-weight: var(--fw-semibold); }

p { max-width: 68ch; }

/* --- Links --- */
a { color: var(--c-primary); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
a:hover { color: var(--c-primary-700); }

ul, ol { padding-left: 1.25rem; }
li { margin-bottom: var(--sp-2); }

strong { font-weight: var(--fw-semibold); color: var(--c-ink); }

/* --- Accessible focus --- */
:focus-visible {
    outline: 3px solid var(--c-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* --- Layout helpers --- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin-inline: auto;
    padding-inline: var(--sp-5);
}
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--sp-8); }
.section--alt { background: var(--c-bg-alt); }
.section--dark { background: var(--c-bg-dark); color: var(--c-on-dark); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--c-on-dark); }
.section--dark p { color: var(--c-on-dark-muted); }

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    color: var(--c-accent);
    margin-bottom: var(--sp-2);
}

.lead { font-size: var(--fs-md); color: var(--c-muted); }

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

.skip-link {
    position: absolute; left: var(--sp-4); top: -100px;
    background: var(--c-accent); color: #fff; padding: var(--sp-3) var(--sp-4);
    border-radius: var(--radius-sm); z-index: 1000; text-decoration: none;
    transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: var(--sp-4); color: #fff; }

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--sp-2);
    font-weight: var(--fw-semibold); font-size: var(--fs-base);
    line-height: 1; text-decoration: none; cursor: pointer;
    padding: 0.875rem 1.5rem; border-radius: var(--radius-pill);
    border: 2px solid transparent;
    min-height: 48px; /* touch target */
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
                border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn:active { transform: translateY(1px); }

.btn-primary { background: var(--c-accent); color: #fff; }
.btn-primary:hover { background: var(--c-accent-700); color: #fff; }

.btn-ghost { background: transparent; color: var(--c-primary); border-color: var(--c-border); }
.btn-ghost:hover { background: var(--c-bg-alt); color: var(--c-primary-700); border-color: var(--c-primary-300); }

.section--dark .btn-ghost { color: #fff; border-color: rgba(255,255,255,0.4); }
.section--dark .btn-ghost:hover { background: rgba(255,255,255,0.1); color: #fff; }

.btn-lg { font-size: var(--fs-md); padding: 1.05rem 1.9rem; }