/* ==========================================================
   BASE
   Reset · Element defaults · Typography · Accessibility
   No layout primitives or utility classes here.
   ========================================================== */

/* ---------- Reset ---------- */

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

html {
    font-size: 100%;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

body {
    min-height: 100vh;
    font-family: var(--font-body);
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-white);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

section[id] {
    scroll-margin-top: calc(var(--header-height) + var(--space-4));
}

/* ---------- Selection ---------- */

::selection {
    background-color: var(--color-accent);
    color: var(--color-inverse);
}

/* ---------- Media ---------- */

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

img,
video {
    height: auto;
}

img[loading="lazy"] {
    background-color: var(--color-light);
}

svg {
    flex-shrink: 0;
}

iframe {
    border: 0;
    max-width: 100%;
}

/* ---------- Links ---------- */

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

a:hover {
    color: var(--color-accent-hover);
}

a:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
    border-radius: 2px;
}

/* Inline content links in prose */
p a,
li a,
dd a {
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

p a:hover,
li a:hover,
dd a:hover {
    text-decoration-thickness: 2px;
}

/* ---------- Lists ---------- */

ul,
ol {
    list-style: none;
}

/* Restore lists inside prose content */
.prose ul {
    list-style: disc;
    padding-left: 1.25em;
}

.prose ol {
    list-style: decimal;
    padding-left: 1.25em;
}

.prose li + li {
    margin-top: var(--space-2);
}

/* ---------- Form Controls (element defaults only) ---------- */

button,
input,
textarea,
select {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
}

button:disabled,
[aria-disabled="true"] {
    cursor: not-allowed;
}

textarea {
    resize: vertical;
}

/* ---------- Typography ---------- */

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

h1 {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-extrabold);
    margin-bottom: var(--space-5);
}

h2 {
    font-size: var(--font-size-h2);
    margin-bottom: var(--space-4);
}

h3 {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
}

h4 {
    font-size: var(--font-size-h4);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
}

h5 {
    font-size: var(--font-size-h5);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
}

h6 {
    font-size: var(--font-size-h6);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-2);
}

p {
    margin-bottom: var(--space-5);
    color: var(--color-text-light);
    max-width: 70ch;
    text-wrap: pretty;
}

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

strong,
b {
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
}

em,
i {
    font-style: italic;
}

small {
    font-size: var(--font-size-sm);
}

blockquote {
    margin: var(--space-6) 0;
    padding-left: var(--space-5);
    border-left: 3px solid var(--color-accent);
    color: var(--color-text);
    font-size: var(--font-size-lg);
    line-height: var(--line-height-relaxed);
}

cite {
    font-style: normal;
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

code,
kbd,
samp {
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.9em;
}

/* ---------- Horizontal Rule ---------- */

hr {
    border: none;
    border-top: var(--border-width) solid var(--color-border);
    margin: var(--space-8) 0;
}

/* ---------- Tables ---------- */

table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
}

th,
td {
    text-align: left;
    padding: var(--space-3) var(--space-4);
    border-bottom: var(--border-width) solid var(--color-border);
    vertical-align: top;
}

th {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
    font-size: var(--font-size-sm);
}

/* ---------- Address / Definition ---------- */

address {
    font-style: normal;
}

dt {
    font-weight: var(--font-weight-semibold);
    color: var(--color-heading);
}

dd + dt {
    margin-top: var(--space-4);
}

dd {
    color: var(--color-text-light);
    margin-top: var(--space-1);
}

/* ---------- Accessibility ---------- */

:focus {
    outline: none;
}

:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Skip link — first focusable element pattern */
.skip-link {
    position: absolute;
    top: 0;
    left: var(--space-4);
    z-index: var(--z-toast);
    padding: var(--space-3) var(--space-5);
    background: var(--color-primary);
    color: var(--color-inverse);
    font-weight: var(--font-weight-semibold);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    transform: translateY(-120%);
    transition: transform var(--transition-fast);
}

.skip-link:focus,
.skip-link:focus-visible {
    transform: translateY(0);
    outline-offset: 2px;
}

/* Visually hidden but available to AT */
.visually-hidden,
.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.visually-hidden--focusable:focus,
.visually-hidden--focusable:focus-visible,
.sr-only--focusable:focus,
.sr-only--focusable:focus-visible {
    position: static !important;
    width: auto !important;
    height: auto !important;
    margin: 0 !important;
    overflow: visible !important;
    clip: auto !important;
    white-space: normal !important;
}