/* Workwright — Design System
   IBM Plex Sans + Mono. Black/white. No gray on gray. */

:root {
    --fg: #000;
    --bg: #fff;
    --secondary: #1a1a1a;
    --rule: #000;
    --input-bg: #f5f5f5;
    --code-bg: #f0f0f0;
    --accept: #1a7a1a;
    --reject: #7a1a1a;
}

@media (prefers-color-scheme: dark) {
    :root {
        --fg: #fff;
        --bg: #0a0a0a;
        --secondary: #e0e0e0;
        --rule: #fff;
        --input-bg: #1a1a1a;
        --code-bg: #151515;
        --accept: #4ade80;
        --reject: #f87171;
    }
}

/* ---- RESET ---- */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* ---- BASE ---- */
body {
    font-family: "IBM Plex Sans", sans-serif;
    font-weight: 400;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.55;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* ---- NAV ---- */
nav {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 2rem;
    display: flex;
    gap: 1.5rem;
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
}

nav a {
    color: var(--fg);
    text-decoration: none;
    opacity: 0.5;
}

nav a:hover { opacity: 0.8; }
nav a.nav-active { opacity: 1; border-bottom: 2px solid var(--fg); }

/* ---- TYPOGRAPHY ---- */
h1 {
    font-size: 2.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.15;
    margin-bottom: 0.5rem;
}

h2 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 1.25rem;
}

header { margin-bottom: 3rem; }
header p { font-size: 1.125rem; color: var(--secondary); }
section { margin-bottom: 3rem; }

.subtitle {
    font-size: 1rem;
    color: var(--secondary);
    margin-bottom: 2rem;
}

.lead {
    font-size: 1.1rem;
    color: var(--fg);
    margin-bottom: 2rem;
}

p { margin-bottom: 1rem; color: var(--secondary); }
p strong { color: var(--fg); }

/* ---- LINKS ---- */
.text-link {
    color: var(--fg);
    text-decoration: none;
    border-bottom: 1px solid var(--fg);
}

/* ---- FORMS ---- */
.field { margin-bottom: 1.25rem; }

.field label {
    display: block;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
}

.field input,
.field textarea {
    width: 100%;
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.9rem;
    padding: 0.75rem;
    background: var(--input-bg);
    color: var(--fg);
    border: 2px solid var(--rule);
    outline: none;
}

.field textarea { min-height: 100px; resize: vertical; }
.field input:focus,
.field textarea:focus { border-color: var(--fg); background: var(--bg); }

/* ---- CODE ---- */
code {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.88em;
    background: var(--code-bg);
    padding: 0.15em 0.35em;
}

pre {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    background: var(--code-bg);
    padding: 1.25rem;
    margin-bottom: 1rem;
    overflow-x: auto;
}

/* ---- DIVIDER ---- */
.divider {
    border: none;
    border-top: 2px solid var(--rule);
    margin: 2.5rem 0;
}

/* ---- FOOTER ---- */
footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--rule);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--secondary);
}

footer a {
    color: var(--fg);
    text-decoration: none;
    border-bottom: 1px solid var(--fg);
}

footer a:hover { opacity: 0.7; }

/* ---- BUTTONS ---- */
.btn {
    font-family: "IBM Plex Mono", monospace;
    font-size: 0.9rem;
    font-weight: 500;
    padding: 0.75rem 2rem;
    background: var(--fg);
    color: var(--bg);
    border: 2px solid var(--fg);
    cursor: pointer;
    width: 100%;
}

.btn:hover { opacity: 0.85; }
.btn:disabled { opacity: 0.3; cursor: not-allowed; }

/* ---- LISTS ---- */
ol, ul {
    margin-bottom: 1rem;
    padding-left: 1.25rem;
    color: var(--secondary);
}

li { margin-bottom: 0.4rem; }
li strong { color: var(--fg); }

/* ---- UTILITY ---- */
.hidden { display: none; }
.mono { font-family: "IBM Plex Mono", monospace; }

/* ---- RESPONSIVE ---- */
@media (max-width: 600px) {
    .container { padding: 2rem 1.25rem; }
    h1 { font-size: 1.75rem; }
    nav { gap: 1rem; font-size: 0.8rem; }
}

/* ---- DIFF COLORS ---- */
/* Muted tones that read on both light and dark backgrounds.
   Inspired by solarized — not pure red/green, but shifted
   to stay legible and accessible. */
:root {
    --diff-add-fg: #2b6a30;
    --diff-add-bg: rgba(43, 106, 48, 0.08);
    --diff-del-fg: #8b3030;
    --diff-del-bg: rgba(139, 48, 48, 0.08);
    --diff-ctx-fg: var(--secondary);
}

@media (prefers-color-scheme: dark) {
    :root {
        --diff-add-fg: #8ec98e;
        --diff-add-bg: rgba(142, 201, 142, 0.1);
        --diff-del-fg: #e08080;
        --diff-del-bg: rgba(224, 128, 128, 0.1);
    }
}