/* ============================================================
   PLATE — engraving / mathematical-atlas design system
   Paper, ink, one vermilion accent. No glassmorphism, no glow,
   no neon. Depth comes from line weight and negative space.
   Shared by every animation "plate".
   ============================================================ */
/* self-hosted brand faces (shared with the main site) — no CDN dependency */
@font-face { font-family: "Spectral"; font-style: normal; font-weight: 400; font-display: swap; src: url("/fonts/spectral-400.woff2") format("woff2"); }
@font-face { font-family: "Spectral"; font-style: normal; font-weight: 500; font-display: swap; src: url("/fonts/spectral-500.woff2") format("woff2"); }
@font-face { font-family: "Spectral"; font-style: normal; font-weight: 600; font-display: swap; src: url("/fonts/spectral-600.woff2") format("woff2"); }
@font-face { font-family: "Spectral"; font-style: italic; font-weight: 400; font-display: swap; src: url("/fonts/spectral-400-italic.woff2") format("woff2"); }
@font-face { font-family: "JetBrains Mono"; font-style: normal; font-weight: 400 700; font-display: swap; src: url("/fonts/jetbrains-mono.woff2") format("woff2"); }

:root {
    color-scheme: light;
    --paper: #efe9da;
    --paper-lit: #f4efe2;
    --paper-deep: #e4dcc8;
    --ink: #1c1a17;
    --ink-soft: #45403a;
    --ink-muted: #7a7264;
    --ink-faint: #aaa08c;
    --vermilion: #c0492f;
    --vermilion-deep: #9c3823;
    --prussian: #2c4a59;
    --line: rgba(28, 26, 23, 0.92);
    --line-mid: rgba(28, 26, 23, 0.34);
    --line-soft: rgba(28, 26, 23, 0.16);
    --line-faint: rgba(28, 26, 23, 0.08);
    --serif: "Spectral", Georgia, "Times New Roman", serif;
    --mono: "JetBrains Mono", ui-monospace, monospace;
    --margin: clamp(20px, 3.2vw, 52px);
}

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

html { background: var(--paper); }

body {
    min-height: 100vh;
    background: var(--paper) !important;
    color: var(--ink) !important;
    font-family: var(--serif) !important;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    text-rendering: geometricPrecision;
}

/* paper grain — a faint multiply texture over everything incl. canvas */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 3;
    pointer-events: none;
    opacity: 0.42;
    mix-blend-mode: multiply;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.5'/%3E%3C/svg%3E");
}

/* the main plate canvas (always a direct child of body) fills the viewport.
   nested canvases (e.g. a drawing pad inside a card) are NOT targeted. */
body > canvas {
    display: block;
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    cursor: grab;
}
body > canvas:active { cursor: grabbing; }

/* ---------- engraving plate border (inset double rule) ---------- */
.plate-frame {
    position: fixed;
    inset: calc(var(--margin) - 8px);
    z-index: 2;
    pointer-events: none;
    border: 1px solid var(--line-mid);
    box-shadow: inset 0 0 0 4px var(--paper), inset 0 0 0 5px var(--line-faint);
}

/* ---------- header: title + plate number ---------- */
.plate-head,
.plate-foot {
    position: fixed;
    left: var(--margin);
    right: var(--margin);
    z-index: 4;
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
}
.plate-head { top: var(--margin); }
.plate-foot {
    bottom: var(--margin);
    align-items: flex-end;
    border-top: 1px solid var(--line-mid);
    padding-top: 12px;
}

.plate-title h1 {
    font-family: var(--serif);
    font-weight: 500;
    font-size: clamp(1.5rem, 2.6vw, 2.4rem);
    line-height: 0.98;
    letter-spacing: -0.005em;
    color: var(--ink);
}
.plate-title .plate-sub {
    font-family: var(--serif);
    font-style: italic;
    font-weight: 400;
    font-size: clamp(0.82rem, 1vw, 0.96rem);
    color: var(--ink-soft);
    margin-top: 4px;
    max-width: 42ch;
}

.plate-no {
    font-family: var(--serif);
    font-weight: 500;
    font-size: 0.72rem;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: var(--ink-soft);
    white-space: nowrap;
    padding-top: 6px;
    text-align: right;
}
.plate-no::before {
    content: "";
    display: block;
    width: 34px;
    height: 1px;
    background: var(--vermilion);
    margin: 0 0 8px auto;
}

/* ---------- legend ---------- */
.plate-legend {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px 18px;
    font-family: var(--serif);
    font-size: 0.82rem;
    color: var(--ink-soft);
}
.plate-legend .lg { display: inline-flex; align-items: center; gap: 7px; white-space: nowrap; }
.plate-legend .mk { width: 9px; height: 9px; border-radius: 50%; background: var(--ink); display: inline-block; }
.plate-legend .mk.prime { background: var(--vermilion); }
.plate-legend .mk.alt { background: var(--prussian); }
.plate-legend .mk.faint { background: var(--ink); opacity: 0.28; }
.plate-legend .mk.bar { width: 16px; height: 2px; border-radius: 0; }

/* ---------- controls (flat, ruled, no glass) ---------- */
.plate-controls {
    display: flex;
    align-items: center;
    gap: 18px;
    flex-wrap: wrap;
    justify-content: flex-end;
}
.ctl-group { display: inline-flex; align-items: center; gap: 9px; }
.ctl-group > .lbl {
    font-family: var(--mono);
    font-size: 0.6rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-muted);
}

button,
.ctl {
    font-family: var(--mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
    color: var(--ink-soft);
    background: transparent;
    border: none;
    border-bottom: 1.5px solid transparent;
    padding: 3px 1px 2px;
    cursor: pointer;
    transition: color 160ms ease, border-color 160ms ease;
    line-height: 1.2;
}
button:hover,
.ctl:hover { color: var(--ink); border-bottom-color: var(--line-mid); }
button.active,
button.primary,
.ctl.active {
    color: var(--vermilion-deep);
    border-bottom-color: var(--vermilion);
}

/* segmented mode selector reads as ruled tabs */
.seg { display: inline-flex; gap: 16px; }

input[type="number"],
input[type="text"] {
    font-family: var(--mono);
    font-size: 0.74rem;
    color: var(--ink);
    background: transparent;
    border: none;
    border-bottom: 1.5px solid var(--line-mid);
    padding: 2px 2px;
    width: 64px;
    text-align: center;
}
input[type="number"]:focus,
input[type="text"]:focus { border-bottom-color: var(--vermilion); }

/* a visible keyboard focus state for every control on the plate (WCAG 2.4.7),
   styled as a vermilion annotation rather than the browser default ring */
button:focus-visible,
.ctl:focus-visible,
.mode-btn:focus-visible,
input:focus-visible {
    outline: 2px solid var(--vermilion);
    outline-offset: 3px;
}
button:focus:not(:focus-visible),
.ctl:focus:not(:focus-visible),
input:focus:not(:focus-visible) { outline: none; }

::selection { background: color-mix(in srgb, var(--vermilion) 24%, transparent); }

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 90px;
    height: 1.5px;
    background: var(--line-mid);
    cursor: pointer;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 11px; height: 11px;
    border-radius: 50%;
    background: var(--vermilion);
    border: 2px solid var(--paper);
}
input[type="range"]::-moz-range-thumb {
    width: 11px; height: 11px; border: 2px solid var(--paper);
    border-radius: 50%; background: var(--vermilion);
}

/* ---------- readout: stats as a typeset table, not a box ---------- */
.plate-readout {
    position: fixed;
    z-index: 4;
    top: calc(var(--margin) + 88px);
    left: var(--margin);
    font-family: var(--mono);
    font-size: 0.7rem;
    color: var(--ink-soft);
    border-left: 1px solid var(--vermilion);
    padding-left: 12px;
    display: grid;
    gap: 5px;
}
.plate-readout .row { display: flex; justify-content: space-between; gap: 22px; }
.plate-readout .row .k { color: var(--ink-muted); letter-spacing: 0.08em; text-transform: uppercase; font-size: 0.6rem; }
.plate-readout .row .v { color: var(--ink); font-weight: 500; font-variant-numeric: tabular-nums; }
.plate-readout .row .v.accent { color: var(--vermilion-deep); }

/* ---------- caption / annotation in the margin ---------- */
.plate-caption {
    position: fixed;
    z-index: 4;
    max-width: 30ch;
    font-family: var(--serif);
    font-style: italic;
    font-size: 0.86rem;
    line-height: 1.5;
    color: var(--ink-soft);
}
.plate-caption .src {
    display: block;
    margin-top: 8px;
    font-style: normal;
    font-family: var(--mono);
    font-size: 0.6rem;
    letter-spacing: 0.06em;
    color: var(--ink-muted);
}

/* ---------- floating hover/info tag ---------- */
.hover-info,
.tooltip {
    position: fixed;
    z-index: 5;
    font-family: var(--mono);
    font-size: 0.72rem;
    color: var(--ink);
    background: var(--paper-lit);
    border: 1px solid var(--line-mid);
    padding: 5px 11px;
    pointer-events: none;
}

/* ---------- neutralize any legacy dark panels left in a file ---------- */
.stats, .title, .info-panel, .legend, .formula, .parameter-panel,
.sequence-display, .predictions, .network-info, .activation-legend,
.credit-box, .controls, .drawing-controls, .drawing-panel,
.input-preview-panel {
    background: transparent !important;
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    color: var(--ink) !important;
}

/* ---------- mobile ---------- */
@media (max-width: 760px) {
    :root { --margin: 16px; }
    /* keep the ruled frame on mobile — it is the plate's identity, just tighter */
    .plate-frame { inset: 10px; }
    .plate-title h1 { font-size: 1.35rem; }
    .plate-title .plate-sub { display: none; }
    .plate-readout { display: none; }
    .plate-caption { display: none; }
    .plate-foot { flex-direction: column; align-items: stretch; gap: 10px; }
    .plate-controls { justify-content: flex-start; overflow-x: auto; -webkit-overflow-scrolling: touch; gap: 14px; }
    .plate-legend { font-size: 0.74rem; gap: 4px 12px; }
}