/* ==========================================================================
   site.css — shared tokens + site bar for every subpage.
   Load it LAST so .site-bar rules win over each page's old `header nav` styles.
   Page-specific looks (PCB, book, console, mesh) stay in their own files;
   this file is only what every page should agree on.
   ========================================================================== */

:root {
    /* sky */
    --sky-0: #0e101f;          /* page ground, same as the star map */
    --sky-1: #151a2e;          /* raised panels */
    --line: rgba(130, 155, 225, 0.18);
    /* ink */
    --ink: #e6eaf7;
    --ink-soft: #b6bfdc;
    --ink-muted: #858fb0;
    /* light */
    --link: #8fb8ff;
    --link-hover: #d4e2ff;
    --betelgeuse: #ffb46e;     /* the one warm accent: "start here" */
    /* type */
    --font-ui: 'Space Grotesk', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'IBM Plex Mono', Menlo, Consolas, monospace;
    --font-read: Georgia, 'Times New Roman', serif;
    --bar-h: 56px;
    /* shared title sizes */
    --fs-h1: clamp(2rem, 1.35rem + 1.6vw, 2.6rem);
    --fs-h2: 1.3rem;
}

/* ---- site bar ---------------------------------------------------------- */
header.site-bar {
    position: sticky;
    top: 0;
    z-index: 60;
    display: flex;
    align-items: center;
    gap: 28px;
    min-height: var(--bar-h);
    margin: 0;
    padding: 0 max(24px, 4vw);
    background: rgba(12, 14, 28, 0.78);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
    box-shadow: none;
    box-sizing: border-box;
    font-family: var(--font-ui);
}

header.site-bar .site-bar__home {
    flex: none;
    margin: 0;
    font-family: var(--font-ui);
    font-size: 1.02rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: var(--ink);
    text-decoration: none;
    text-shadow: none;
}

header.site-bar .site-bar__home:hover {
    color: #fff;
    text-shadow: none;
}

header.site-bar nav {
    display: flex;
    gap: 22px;
    margin: 0 0 0 auto;
    padding: 0;
    overflow-x: auto;
    scrollbar-width: none;
    font-family: var(--font-ui);
    font-size: 0.95rem;
    color: var(--ink-muted);
}

header.site-bar nav::-webkit-scrollbar { display: none; }

header.site-bar nav a {
    position: relative;
    flex: none;
    margin: 0;
    padding: 6px 0;
    font-family: var(--font-ui);
    font-size: inherit;
    color: var(--ink-muted);
    text-decoration: none;
    text-shadow: none;
    transition: color 0.2s ease;
}

header.site-bar nav a:hover,
header.site-bar nav a:focus-visible {
    color: var(--ink);
    text-shadow: none;
}

header.site-bar nav a[aria-current="page"] {
    color: var(--ink);
}

/* current page: a short line of light under the link */
header.site-bar nav a[aria-current="page"]::after {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 2px;
    border-radius: 1px;
    background: var(--link);
    box-shadow: 0 0 8px rgba(143, 184, 255, 0.7);
}

/* ---- shared keyboard focus ring (zero specificity: pages can still override) ---- */
:where(a, button, summary, select, [tabindex]):focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 3px;
    border-radius: 3px;
}

header.site-bar a:focus-visible {
    outline: 2px solid var(--link);
    outline-offset: 4px;
    border-radius: 2px;
}

@media (max-width: 720px) {
    header.site-bar {
        gap: 18px;
        padding: 0 16px;
    }
    header.site-bar nav a { padding: 12px 0; }
    header.site-bar nav {
        gap: 18px;
        font-size: 0.9rem;
        /* fade the scroll edge so it reads as "more this way" */
        -webkit-mask-image: linear-gradient(90deg, #000 85%, transparent);
        mask-image: linear-gradient(90deg, #000 85%, transparent);
    }
}

@media (prefers-reduced-motion: reduce) {
    header.site-bar nav a { transition: none; }
}

/* ---- footer: same side gutter as the site bar on every subpage -------- */
body > footer:not(.site-footer) {
    padding: 40px max(24px, 4vw);
    box-sizing: border-box;
    text-align: left;
    color: var(--ink-muted);
    font-size: 0.85rem;
}

body > footer:not(.site-footer) p { margin: 0; }

@media (max-width: 720px) {
    body > footer:not(.site-footer) {
        padding-left: 16px;
        padding-right: 16px;
    }
}

/* ---- page titles: one size across projects, papers, blog, rigel, about, articles ---- */
body.pg-title h1,
body.rigel-page h1,
main.projects-main h1 {
    font-size: var(--fs-h1);
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* ---- project cards: status chip sits beside the title, not inside the <h2> ----
   (keeps the heading text clean for crawlers; the layout matches the old h2 + chip row) */
.project .project-head {
    display: flex;
    align-items: center;
    gap: 0.55em;
    margin: 0 0 0.75em 0;
    font-size: 1.27em;
    line-height: 1.25;
}

.project .project-head h2 {
    margin: 0;
    font-size: 1em;
}