/* ==========================================================================
   Baseline — reset and element defaults. No component styling below this line.
   ========================================================================== */

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

* {
    margin: 0;
}

html {
    color-scheme: dark;
    -webkit-text-size-adjust: 100%;
    /* App chrome should not feel like a document. */
    -webkit-user-select: none;
    user-select: none;
}

body {
    min-height: 100dvh;
    background-color: var(--dn-bg-app);
    color: var(--dn-fg);
    font-family: var(--dn-font-ui);
    font-size: var(--dn-text-base);
    line-height: var(--dn-leading-normal);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow: hidden; /* the editor and sidebar scroll, the shell does not */
}

/* Text the user is meant to read or copy opts back in. */
input,
textarea,
[contenteditable],
.selectable {
    -webkit-user-select: text;
    user-select: text;
}

/* --- Typographic elements ------------------------------------------------- */

h1, h2, h3, h4 {
    font-weight: 600;
    line-height: var(--dn-leading-tight);
    text-wrap: balance;
}

h1 { font-size: var(--dn-text-xl); }
h2 { font-size: var(--dn-text-lg); }
h3 { font-size: var(--dn-text-md); }
h4 { font-size: var(--dn-text-base); }

p {
    text-wrap: pretty;
    max-width: var(--dn-measure);
}

small {
    font-size: var(--dn-text-xs);
    color: var(--dn-fg-muted);
}

code, kbd, samp, pre {
    font-family: var(--dn-font-code);
    font-size: 0.9375em;
}

hr {
    border: 0;
    border-top: 1px solid var(--dn-border);
}

a {
    color: var(--dn-accent);
    text-decoration-color: var(--dn-accent-muted);
    text-underline-offset: 2px;
    transition: color var(--dn-dur-fast) var(--dn-ease);
}

a:hover {
    text-decoration-color: currentColor;
}

/* --- Form and media defaults ---------------------------------------------- */

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

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

button {
    background: none;
    border: 0;
    padding: 0;
    cursor: pointer;
}

:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

::placeholder {
    color: var(--dn-fg-faint);
}

::selection {
    background: var(--dn-accent-muted);
    color: var(--dn-fg);
}

/* --- Focus ---------------------------------------------------------------- */

:focus-visible {
    outline: 2px solid var(--dn-accent);
    outline-offset: 2px;
    border-radius: var(--dn-radius-sm);
}

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

/* --- Scrollbars ------------------------------------------------------------ */

* {
    scrollbar-width: thin;
    scrollbar-color: var(--dn-border-strong) transparent;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--dn-border);
    border: 3px solid transparent;
    background-clip: content-box;
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--dn-border-strong);
    background-clip: content-box;
}

/* --- Reduced motion --------------------------------------------------------- */

@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;
    }
}