/* ============================================================
   COMPONENTS
   Everything here reads its colour from the surface context,
   so a card looks correct on light and dark without variants.
   ============================================================ */

/* ------------------------------------------------------------
   BUTTONS
   ------------------------------------------------------------ */
.btn {
    --btn-pad-y: 0.7rem;
    --btn-pad-x: 1.35rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--s-2);
    padding: var(--btn-pad-y) var(--btn-pad-x);
    border-radius: 99px;
    border: 1px solid transparent;
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: -0.01em;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    transition: background-color var(--dur-fast) var(--ease-out-quart),
                border-color var(--dur-fast) var(--ease-out-quart),
                color var(--dur-fast) var(--ease-out-quart),
                transform var(--dur-fast) var(--ease-out-quart),
                box-shadow var(--dur-fast) var(--ease-out-quart);
}
.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--fg);
    color: var(--bg);
    box-shadow: var(--lift-1);
}
.btn-primary:hover { box-shadow: var(--lift-2); transform: translateY(-1px); }
.btn-primary:active { transform: translateY(0); }

.btn-accent {
    background: var(--accent);
    color: var(--bg);
}
.btn-accent:hover { filter: brightness(1.08); transform: translateY(-1px); }

.btn-ghost {
    background: transparent;
    color: var(--fg);
    border-color: var(--line-strong);
}
.btn-ghost:hover { background: var(--bg-inset); border-color: var(--fg-faint); }

.btn-quiet {
    background: transparent;
    color: var(--fg-muted);
    padding-inline: var(--s-3);
}
.btn-quiet:hover { color: var(--fg); background: var(--bg-inset); }

.btn-lg { --btn-pad-y: 0.95rem; --btn-pad-x: 1.9rem; font-size: var(--text-base); }
.btn-sm { --btn-pad-y: 0.45rem; --btn-pad-x: 0.9rem; font-size: var(--text-xs); }

.btn-mono {
    font-family: var(--font-mono);
    font-size: var(--text-micro);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
}

.btn[disabled], .btn:disabled { opacity: .45; pointer-events: none; }

/* Arrow that slides on hover. */
.btn .arrow { transition: transform var(--dur) var(--ease-out-expo); }
.btn:hover .arrow { transform: translateX(3px); }

/* ------------------------------------------------------------
   LINKS
   ------------------------------------------------------------ */
.link {
    color: var(--fg);
    text-decoration: underline;
    text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
    text-underline-offset: .22em;
    text-decoration-thickness: 1.5px;
    transition: color var(--dur-fast), text-decoration-color var(--dur-fast);
}
.link:hover { color: var(--accent); text-decoration-color: var(--accent); }

/* Underline that draws in from the left. */
.link-draw {
    position: relative;
    display: inline-block;
    color: var(--fg);
}
.link-draw::after {
    content: '';
    position: absolute;
    left: 0; bottom: -2px;
    width: 100%; height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--dur) var(--ease-out-expo);
}
.link-draw:hover::after { transform: scaleX(1); }

/* ------------------------------------------------------------
   CARDS
   ------------------------------------------------------------ */
.card {
    position: relative;
    display: block;
    background: var(--bg-raised);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: var(--s-6);
    transition: border-color var(--dur) var(--ease-out-quart),
                box-shadow var(--dur) var(--ease-out-quart),
                transform var(--dur) var(--ease-out-quart);
}
a.card:hover, .card-interactive:hover {
    border-color: var(--line-strong);
    box-shadow: var(--lift-3);
    transform: translateY(-3px);
}
.card-flush { padding: 0; overflow: hidden; }
.card-lg { padding: var(--s-8); }

/* A card whose whole area is clickable via a stretched pseudo-link. */
.stretch-link::after {
    content: '';
    position: absolute;
    inset: 0;
    z-index: 1;
}

/* ------------------------------------------------------------
   CHIPS / TAGS
   ------------------------------------------------------------ */
.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--s-2);
    padding: 0.3rem 0.7rem;
    border-radius: 99px;
    border: 1px solid var(--line);
    background: var(--bg-raised);
    font-family: var(--font-mono);
    font-size: var(--text-micro);
    letter-spacing: var(--tracking-mono);
    color: var(--fg-muted);
    white-space: nowrap;
}
.chip-accent   { color: var(--accent);   border-color: color-mix(in srgb, var(--accent) 35%, transparent);   background: color-mix(in srgb, var(--accent) 8%, transparent); }
.chip-hazard   { color: var(--hazard);   border-color: color-mix(in srgb, var(--hazard) 35%, transparent);   background: color-mix(in srgb, var(--hazard) 8%, transparent); }
.chip-verified { color: var(--verified); border-color: color-mix(in srgb, var(--verified) 35%, transparent); background: color-mix(in srgb, var(--verified) 8%, transparent); }
.chip-fault    { color: var(--fault);    border-color: color-mix(in srgb, var(--fault) 35%, transparent);    background: color-mix(in srgb, var(--fault) 8%, transparent); }

.chip-dot::before {
    content: '';
    width: 5px; height: 5px;
    border-radius: 50%;
    background: currentColor;
    flex: none;
}

/* Live availability indicator. */
.pulse-dot {
    position: relative;
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--verified);
    flex: none;
}
.pulse-dot::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 1px solid var(--verified);
    animation: pulse-ring 2.4s var(--ease-out-expo) infinite;
}

/* ------------------------------------------------------------
   FORMS
   ------------------------------------------------------------ */
.field { display: flex; flex-direction: column; gap: var(--s-2); }

.field-label {
    font-family: var(--font-mono);
    font-size: var(--text-micro);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--fg-subtle);
}

.input {
    width: 100%;
    padding: 0.8rem 1rem;
    background: var(--bg-raised);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    color: var(--fg);
    font-size: var(--text-base);
    line-height: 1.5;
    transition: border-color var(--dur-fast), box-shadow var(--dur-fast), background var(--dur-fast);
    /* 16px minimum on mobile stops iOS Safari zooming on focus. */
}
@media (max-width: 767px) { .input { font-size: 16px; } }

.input::placeholder { color: var(--fg-faint); }
.input:hover { border-color: var(--fg-faint); }
.input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
    background: var(--bg-raised);
}
textarea.input { resize: vertical; min-height: 8rem; }
select.input { cursor: pointer; }

.input-error { border-color: var(--fault); }

.form-note {
    font-size: var(--text-xs);
    color: var(--fg-subtle);
}

/* Inline feedback banner */
.notice {
    display: flex;
    align-items: flex-start;
    gap: var(--s-3);
    padding: var(--s-4);
    border-radius: var(--radius);
    border: 1px solid;
    font-size: var(--text-sm);
    line-height: 1.5;
}
.notice-ok    { color: var(--verified); border-color: color-mix(in srgb, var(--verified) 35%, transparent); background: color-mix(in srgb, var(--verified) 7%, transparent); }
.notice-warn  { color: var(--hazard);   border-color: color-mix(in srgb, var(--hazard) 35%, transparent);   background: color-mix(in srgb, var(--hazard) 7%, transparent); }
.notice-error { color: var(--fault);    border-color: color-mix(in srgb, var(--fault) 35%, transparent);    background: color-mix(in srgb, var(--fault) 7%, transparent); }
.notice-info  { color: var(--accent);   border-color: color-mix(in srgb, var(--accent) 35%, transparent);   background: color-mix(in srgb, var(--accent) 7%, transparent); }

/* ------------------------------------------------------------
   NAVIGATION
   ------------------------------------------------------------ */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: var(--z-nav);
    transition: background-color var(--dur) var(--ease-out-quart),
                border-color var(--dur) var(--ease-out-quart),
                backdrop-filter var(--dur);
    border-bottom: 1px solid transparent;
}
.nav.is-scrolled {
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom-color: var(--line);
}

/* The nav is fixed and transparent, so it floats over whatever section
   happens to be beneath it. site.js watches sections and adds .nav-invert
   when that section is dark, otherwise the brand and links would sit
   dark-on-dark over a cinematic section. */
.nav.nav-invert {
    --bg:          var(--ink);
    --bg-raised:   var(--ink-raised);
    --bg-inset:    #1A1A20;
    --line:        var(--ink-line);
    --line-strong: #2A2A31;
    --fg:          #FAFAF9;
    --fg-muted:    #C4C0BB;
    --fg-subtle:   #8B857F;
    --fg-faint:    #57534E;
    --accent:      var(--signal-on-dark);
    --verified:    var(--verified-on-dark);
}
.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-6);
    height: 4.5rem;
}
.nav-brand {
    font-family: var(--font-display);
    font-size: 1.35rem;
    letter-spacing: var(--tracking-tight);
    color: var(--fg);
    white-space: nowrap;
}
.nav-links {
    display: none;
    align-items: center;
    gap: var(--s-1);
}
@media (min-width: 900px) { .nav-links { display: flex; } }

.nav-link {
    position: relative;
    padding: var(--s-2) var(--s-3);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    color: var(--fg-muted);
    transition: color var(--dur-fast), background var(--dur-fast);
}
.nav-link:hover { color: var(--fg); background: var(--bg-inset); }
.nav-link[aria-current="page"] { color: var(--fg); }
.nav-link[aria-current="page"]::after {
    content: '';
    position: absolute;
    left: var(--s-3); right: var(--s-3); bottom: 2px;
    height: 1.5px;
    background: var(--accent);
    border-radius: 2px;
}

.nav-actions { display: flex; align-items: center; gap: var(--s-2); }

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem; height: 2.25rem;
    border-radius: 50%;
    color: var(--fg-muted);
    border: 1px solid transparent;
    transition: color var(--dur-fast), background var(--dur-fast), border-color var(--dur-fast);
}
.icon-btn:hover { color: var(--fg); background: var(--bg-inset); border-color: var(--line); }
.icon-btn svg { width: 1.05rem; height: 1.05rem; }

/* Mobile menu */
.nav-toggle { display: inline-flex; }
@media (min-width: 900px) { .nav-toggle { display: none; } }

.mobile-menu {
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    background: var(--bg);
    display: flex;
    flex-direction: column;
    padding: var(--s-6) var(--gutter) var(--s-12);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity var(--dur) var(--ease-out-quart),
                transform var(--dur) var(--ease-out-quart),
                visibility var(--dur);
}
.mobile-menu.is-open { opacity: 1; visibility: visible; transform: none; }
.mobile-menu-links {
    display: flex;
    flex-direction: column;
    gap: var(--s-1);
    margin-top: var(--s-12);
}
.mobile-menu-link {
    padding: var(--s-4) 0;
    border-bottom: 1px solid var(--line);
    font-family: var(--font-display);
    font-size: 2rem;
    letter-spacing: var(--tracking-tight);
    color: var(--fg);
}
.mobile-menu-link:active { color: var(--accent); }

/* ------------------------------------------------------------
   FOOTER
   ------------------------------------------------------------ */
.site-footer {
    background: var(--bg);
    color: var(--fg);
    border-top: 1px solid var(--line);
    padding-block: var(--s-16) var(--s-8);
}
.footer-grid {
    display: grid;
    gap: var(--s-10);
    grid-template-columns: 1fr;
}
@media (min-width: 720px)  { .footer-grid { grid-template-columns: 2fr 1fr 1fr; gap: var(--s-8); } }
.footer-heading {
    font-family: var(--font-mono);
    font-size: var(--text-micro);
    letter-spacing: var(--tracking-label);
    text-transform: uppercase;
    color: var(--fg-subtle);
    margin-bottom: var(--s-4);
}
.footer-list { display: flex; flex-direction: column; gap: var(--s-3); }
.footer-list a { font-size: var(--text-sm); color: var(--fg-muted); transition: color var(--dur-fast); }
.footer-list a:hover { color: var(--accent); }
.footer-bottom {
    margin-top: var(--s-12);
    padding-top: var(--s-6);
    border-top: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    gap: var(--s-4);
    align-items: center;
    justify-content: space-between;
    font-family: var(--font-mono);
    font-size: var(--text-micro);
    letter-spacing: var(--tracking-mono);
    color: var(--fg-faint);
}
.social-row { display: flex; gap: var(--s-2); }
.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.25rem; height: 2.25rem;
    border-radius: 50%;
    border: 1px solid var(--line);
    color: var(--fg-muted);
    transition: color var(--dur-fast), border-color var(--dur-fast), transform var(--dur-fast);
}
.social-link:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); }
.social-link svg { width: 1rem; height: 1rem; }

/* ------------------------------------------------------------
   MISC
   ------------------------------------------------------------ */

/* Fine engineering rule used between list rows. */
.rule { height: 1px; background: var(--line); border: 0; }

/* Numbered index label, e.g. 01 — used in lists of work. */
.index-num {
    font-family: var(--font-mono);
    font-size: var(--text-micro);
    letter-spacing: var(--tracking-label);
    color: var(--fg-faint);
    font-variant-numeric: tabular-nums;
}

/* Row list — replaces card grids where a quiet list reads better. */
.row-list { border-top: 1px solid var(--line); }
.row-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: var(--s-4);
    align-items: baseline;
    padding: var(--s-6) 0;
    border-bottom: 1px solid var(--line);
    position: relative;
    transition: padding-left var(--dur) var(--ease-out-expo);
}
.row-item:hover { padding-left: var(--s-3); }
.row-item:hover .row-title { color: var(--accent); }
.row-title {
    font-size: var(--text-lg);
    font-weight: 500;
    letter-spacing: var(--tracking-tight);
    color: var(--fg);
    transition: color var(--dur-fast);
}
.row-desc { color: var(--fg-muted); font-size: var(--text-sm); margin-top: var(--s-1); max-width: 52ch; }

/* Marquee-ish scrolling strip of skills/tools. */
.ticker {
    display: flex;
    gap: var(--s-3);
    overflow-x: auto;
    scrollbar-width: none;
    padding-bottom: var(--s-2);
}
.ticker::-webkit-scrollbar { display: none; }

/* Scroll progress bar for articles. */
.read-progress {
    position: fixed;
    top: 0; left: 0;
    height: 2px;
    width: 100%;
    transform: scaleX(0);
    transform-origin: left;
    background: var(--accent);
    z-index: calc(var(--z-nav) + 1);
    will-change: transform;
}

/* TOC link states (article sidebar) */
.toc-link { transition: color var(--dur-fast), border-color var(--dur-fast); border-left: 1.5px solid transparent; padding-left: var(--s-3); }
.toc-link.is-active { color: var(--accent); border-left-color: var(--accent); }

/* ------------------------------------------------------------
   COMMAND PALETTE (⌘K)
   ------------------------------------------------------------ */
.cmd-overlay {
    position: fixed; inset: 0; z-index: var(--z-modal);
    background: rgb(8 8 10 / .55);
    backdrop-filter: blur(4px);
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: 12vh var(--gutter) var(--gutter);
}
.cmd-overlay.is-open { display: flex; }
.cmd-panel {
    width: 100%; max-width: 34rem;
    background: var(--bg-raised);
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--lift-4);
    overflow: hidden;
}
.cmd-input {
    width: 100%; padding: var(--s-5) var(--s-5);
    background: none; border: none; border-bottom: 1px solid var(--line);
    color: var(--fg); font-size: var(--text-lg);
}
.cmd-input:focus { outline: none; }
.cmd-input::placeholder { color: var(--fg-faint); }
.cmd-results { max-height: 22rem; overflow-y: auto; padding: var(--s-2); }
.cmd-item {
    display: flex; align-items: center; gap: var(--s-3);
    width: 100%; text-align: left;
    padding: var(--s-3) var(--s-4);
    border-radius: var(--radius-sm);
    color: var(--fg-muted);
    font-size: var(--text-sm);
}
.cmd-item.is-active, .cmd-item:hover { background: var(--bg-inset); color: var(--fg); }
.cmd-kind {
    margin-left: auto;
    font-family: var(--font-mono); font-size: var(--text-micro);
    letter-spacing: var(--tracking-label); color: var(--fg-faint);
}
.cmd-empty { padding: var(--s-6); text-align: center; color: var(--fg-subtle); font-size: var(--text-sm); }
.cmd-hint {
    display: flex; gap: var(--s-4); justify-content: space-between;
    padding: var(--s-3) var(--s-5);
    border-top: 1px solid var(--line);
    font-family: var(--font-mono); font-size: var(--text-micro);
    color: var(--fg-faint); letter-spacing: var(--tracking-mono);
}
kbd {
    font-family: var(--font-mono); font-size: .9em;
    padding: .1em .4em; border: 1px solid var(--line-strong);
    border-radius: 4px; background: var(--bg-inset);
}