/* =============================================================================
   rhall.site — site.css
   Terminal/cyberpunk-dark design system. Mobile-first.
   Tokenized via CSS custom properties so it is themable later.
   Respects prefers-reduced-motion and prefers-color-scheme.
   ========================================================================== */

/* ----- design tokens ------------------------------------------------------- */
:root {
    /* palette */
    --bg:        #0a0e14;
    --bg-elev:   #11161f;
    --bg-elev2:  #161d28;
    --fg:        #d4d7de;
    --fg-strong: #f3f5f8;
    --muted:     #7a8290;
    --border:    #1e2530;
    --border-hi: #2c3544;
    --accent:    #00ffc8;   /* terminal cyan */
    --accent-2:  #ff5ea0;   /* hot pink     */
    --ok:        #4ade80;
    --warn:      #fbbf24;

    /* type */
    --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", ui-monospace,
                 "Cascadia Code", Menlo, Consolas, monospace;

    /* scale (fluid) */
    --step--1: clamp(0.83rem, 0.78rem + 0.2vw, 0.94rem);
    --step-0:  clamp(1rem,    0.94rem + 0.3vw, 1.13rem);
    --step-1:  clamp(1.25rem, 1.15rem + 0.5vw, 1.5rem);
    --step-2:  clamp(1.56rem, 1.35rem + 1.1vw, 2.2rem);
    --step-3:  clamp(1.95rem, 1.55rem + 2.0vw, 3.05rem);
    --step-4:  clamp(2.44rem, 1.80rem + 3.2vw, 4.25rem);

    /* layout */
    --maxw:    1080px;
    --gutter:  clamp(1rem, 0.7rem + 1.5vw, 2.5rem);
    --radius:  6px;

    /* glow */
    --glow-accent:  0 0 0 1px rgba(0,255,200,.18), 0 0 18px rgba(0,255,200,.12);
    --glow-accent2: 0 0 0 1px rgba(255,94,160,.20), 0 0 18px rgba(255,94,160,.12);
}

/* ----- reset --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    font-size: var(--step-0);
    line-height: 1.6;
    min-height: 100dvh;
    /* faint cyber grid + scanline, layered */
    background-image:
        linear-gradient(180deg, rgba(0,255,200,.015) 0%, transparent 120px),
        repeating-linear-gradient(0deg,
            rgba(255,255,255,.012) 0 1px, transparent 1px 3px),
        repeating-linear-gradient(90deg,
            rgba(255,255,255,.010) 0 1px, transparent 1px 48px);
    background-attachment: fixed;
}
img, svg { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
h1, h2, h3, h4 { color: var(--fg-strong); line-height: 1.2; font-weight: 700; }

/* ----- shared bits --------------------------------------------------------- */
.mono-label {
    font-family: var(--font-mono);
    font-size: var(--step--1);
    letter-spacing: .04em;
    color: var(--accent);
    text-transform: uppercase;
    margin: 0 0 .25rem;
}
.tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: .72rem;
    letter-spacing: .03em;
    text-transform: uppercase;
    padding: .15rem .5rem;
    border: 1px solid var(--border-hi);
    border-radius: 3px;
    color: var(--muted);
    background: var(--bg-elev);
}
.tag--web       { color: var(--accent);   border-color: rgba(0,255,200,.35); }
.tag--writing  { color: #c4b5fd;          border-color: rgba(196,181,253,.35); }
.tag--hardware { color: var(--warn);      border-color: rgba(251,191,36,.35); }
.tag--design   { color: var(--accent-2);  border-color: rgba(255,94,160,.35); }

/* ----- header -------------------------------------------------------------- */
.site-header { position: sticky; top: 0; z-index: 20; background: rgba(10,14,20,.78); backdrop-filter: blur(8px); }
.site-header__inner {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: .85rem var(--gutter);
    display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
}
.wordmark { font-family: var(--font-mono); font-weight: 700; font-size: 1.05rem; color: var(--fg-strong); }
.wordmark:hover { text-decoration: none; }
.wordmark__bracket { color: var(--muted); }
.wordmark__name    { color: var(--fg-strong); }
.wordmark__dot     { color: var(--accent-2); }
.wordmark__tld     { color: var(--accent); }
.wordmark__prompt  { color: var(--accent); margin-left: 2px; }
.wordmark__prompt  { animation: blink 1.1s steps(2) infinite; }

.site-nav { display: flex; flex-wrap: wrap; gap: .35rem .9rem; }
.nav-link {
    font-family: var(--font-mono);
    font-size: .82rem;
    letter-spacing: .02em;
    color: var(--muted);
    padding: .25rem 0;
    border-bottom: 1px solid transparent;
}
.nav-link:hover { color: var(--fg-strong); text-decoration: none; border-bottom-color: var(--accent); }
.nav-link.is-active { color: var(--accent); border-bottom-color: var(--accent); }

.topline { height: 2px; width: 100%; background: linear-gradient(90deg, var(--accent) 0%, var(--accent-2) 50%, transparent 100%); opacity: .55; }

/* ----- main layout --------------------------------------------------------- */
.site-main { display: block; }
.section { max-width: var(--maxw); margin: 0 auto; padding: 2.5rem var(--gutter); }
.section__label { margin-bottom: 1.2rem; }
.section__body { /* container for grids/prose */ }

/* ----- hero ---------------------------------------------------------------- */
.hero { max-width: var(--maxw); margin: 0 auto; padding: clamp(3rem, 8vw, 6rem) var(--gutter) 2.5rem; }
.hero__kicker { margin-bottom: 1rem; }
.hero__headline {
    font-size: var(--step-4);
    margin: 0 0 1rem;
    letter-spacing: -.02em;
}
.hero__headline::after { content: "_"; color: var(--accent); margin-left: .1em; animation: blink 1.1s steps(2) infinite; }
.hero__subhead { font-size: var(--step-1); color: var(--muted); max-width: 56ch; margin: 0 0 2rem; }
.hero__cta { display: flex; flex-wrap: wrap; gap: .8rem; }

.btn {
    display: inline-flex; align-items: center; gap: .4rem;
    font-family: var(--font-mono); font-size: .88rem; letter-spacing: .02em;
    padding: .65rem 1.1rem; border-radius: var(--radius);
    border: 1px solid var(--border-hi); color: var(--fg-strong);
    background: var(--bg-elev); transition: box-shadow .15s, border-color .15s, transform .05s;
}
.btn:hover { text-decoration: none; border-color: var(--accent); box-shadow: var(--glow-accent); }
.btn:active { transform: translateY(1px); }
.btn--primary { border-color: var(--accent); color: var(--bg); background: var(--accent); }
.btn--primary:hover { box-shadow: var(--glow-accent); color: var(--bg); }

/* ----- project grid -------------------------------------------------------- */
.grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
}
.card {
    display: flex; flex-direction: column; gap: .6rem;
    padding: 1.2rem;
    background: linear-gradient(180deg, var(--bg-elev), var(--bg-elev2));
    border: 1px solid var(--border);
    border-radius: var(--radius);
    transition: border-color .15s, box-shadow .15s, transform .05s;
    height: 100%;
}
.card:hover { border-color: var(--border-hi); box-shadow: var(--glow-accent); }
.card__title { margin: 0; font-size: var(--step-1); color: var(--fg-strong); }
.card__title a { color: inherit; }
.card__title a:hover { color: var(--accent); text-decoration: none; }
.card__summary { margin: 0; color: var(--muted); font-size: var(--step--1); }
.card__meta { margin-top: auto; display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; }
.card__links { display: flex; gap: .8rem; font-family: var(--font-mono); font-size: .8rem; }
.card--empty { border-style: dashed; color: var(--muted); align-items: center; text-align: center; }

/* ----- prose (project detail / about) ------------------------------------- */
.prose { max-width: 70ch; }
.prose h1 { font-size: var(--step-3); }
.prose h2 { font-size: var(--step-2); margin-top: 2rem; }
.prose h3 { font-size: var(--step-1); margin-top: 1.5rem; }
.prose p { margin: 0 0 1rem; }
.prose ul, .prose ol { margin: 0 0 1rem 1.3rem; }
.prose li { margin-bottom: .35rem; }
.prose code { font-family: var(--font-mono); font-size: .9em; background: var(--bg-elev); padding: .1rem .35rem; border-radius: 3px; color: var(--accent); }
.prose pre { background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; overflow: auto; }
.prose pre code { background: none; padding: 0; color: var(--fg); }
.prose a { color: var(--accent); }
.prose hr { border: none; border-top: 1px solid var(--border-hi); margin: 2rem 0; }
.prose blockquote { border-left: 3px solid var(--accent); margin: 0 0 1rem; padding: .25rem 0 .25rem 1rem; color: var(--muted); }

.meta-row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin-bottom: 1.5rem; }

/* ----- demos CTA panel ----------------------------------------------------- */
.panel {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background: linear-gradient(135deg, rgba(0,255,200,.05), transparent 60%), var(--bg-elev);
    padding: 1.6rem;
}
.panel h3 { margin: 0 0 .5rem; }
.panel p  { margin: 0 0 1rem; color: var(--muted); }
.panel__list { display: flex; flex-direction: column; gap: .5rem; font-family: var(--font-mono); font-size: .9rem; }

/* ----- contact ------------------------------------------------------------ */
.contact-list { display: flex; flex-direction: column; gap: .6rem; list-style: none; padding: 0; margin: 0; font-family: var(--font-mono); }
.contact-list li::before { content: "> "; color: var(--accent-2); }

/* ----- about -------------------------------------------------------------- */
.about-grid { display: grid; gap: 1.5rem; grid-template-columns: 1fr; }
@media (min-width: 768px) { .about-grid { grid-template-columns: 2fr 1fr; } }
.about__stats { display: grid; gap: .8rem; }
.stat { border: 1px solid var(--border); border-radius: var(--radius); padding: 1rem; background: var(--bg-elev); }
.stat__num { font-family: var(--font-mono); font-size: var(--step-2); color: var(--accent); }
.stat__label { font-family: var(--font-mono); font-size: .8rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }

/* ----- filter chips ------------------------------------------------------- */
.chips { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.5rem; }
.chip {
    font-family: var(--font-mono); font-size: .8rem; letter-spacing: .02em;
    padding: .35rem .8rem; border-radius: 999px;
    border: 1px solid var(--border-hi); color: var(--muted); background: var(--bg-elev);
}
.chip:hover { color: var(--fg-strong); text-decoration: none; border-color: var(--accent); }
.chip.is-active { color: var(--bg); background: var(--accent); border-color: var(--accent); }

/* ----- footer ------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); margin-top: 3rem; background: rgba(0,0,0,.2); }
.site-footer__inner { max-width: var(--maxw); margin: 0 auto; padding: 1.5rem var(--gutter); display: flex; flex-direction: column; gap: .25rem; }
.site-footer__stack { margin: 0; font-size: var(--step--1); color: var(--muted); }
.site-footer__stack a { color: var(--muted); border-bottom: 1px dotted var(--border-hi); }
.site-footer__stack a:hover { color: var(--accent); text-decoration: none; }

/* ----- empty / 404 -------------------------------------------------------- */
.notice { max-width: var(--maxw); margin: 0 auto; padding: 5rem var(--gutter); text-align: center; }
.notice__code { font-family: var(--font-mono); font-size: var(--step-3); color: var(--accent-2); }

/* ----- motion preferences ------------------------------------------------- */
@keyframes blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) {
    .wordmark__prompt, .hero__headline::after { animation: none; }
    .card, .btn { transition: none; }
    * { scroll-behavior: auto !important; }
}

/* light scheme fallback (for users who force it) --------------------------- */
@media (prefers-color-scheme: light) {
    :root {
        --bg:#f6f7f9; --bg-elev:#ffffff; --bg-elev2:#eef0f3;
        --fg:#1a1f29; --fg-strong:#07090d; --muted:#5a6573;
        --border:#d9dee5; --border-hi:#c2cad4;
        --accent:#0099a3; --accent-2:#d61f73;
    }
    body { background-image:
        repeating-linear-gradient(0deg, rgba(0,0,0,.02) 0 1px, transparent 1px 3px); }
}