/* PRISM brand foundation. Tokens, fonts, base type, shared components.
   Brand rules: docs/BRAND.md. Risk colors are reserved for machine-risk status. */

@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Sans"; font-style: normal; font-weight: 700; font-display: swap; src: url("../fonts/ibm-plex-sans-latin-700-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 400; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 500; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "IBM Plex Mono"; font-style: normal; font-weight: 600; font-display: swap; src: url("../fonts/ibm-plex-mono-latin-600-normal.woff2") format("woff2"); }

:root {
    --prism-bg: #0B1220;
    --prism-surface: #111A2E;
    --prism-surface-raised: #172340;
    --prism-border: #26355A;
    --prism-accent: #8AB4F8;
    --prism-accent-hover: #A9C7FA;
    --prism-accent-pressed: #7AA5EE;
    --prism-accent-ink: #0B1220;
    --prism-text: #E8EEFB;
    --prism-muted: #A3B3D1;
    --prism-disabled-text: #8494B5;

    --prism-risk-low: #34D399;
    --prism-risk-elevated: #FBBF24;
    --prism-risk-high: #F87171;

    --prism-radius-sm: 6px;
    --prism-radius-md: 8px;
    --prism-radius-lg: 12px;

    --prism-space-1: 4px;
    --prism-space-2: 8px;
    --prism-space-3: 12px;
    --prism-space-4: 16px;
    --prism-space-6: 24px;
    --prism-space-8: 32px;
    --prism-space-12: 48px;

    --prism-font-ui: "IBM Plex Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --prism-font-data: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* Light theme. Same tokens, new values. Used when the visitor's system asks for
   light, or when the header switch sets data-theme="light". The switch wins:
   data-theme="dark" keeps the dark values even on a light system.
   Contrast ratios are listed in docs/BRAND.md. */
:root[data-theme="light"] {
    color-scheme: light;
    --prism-bg: #F6F8FC;
    --prism-surface: #FFFFFF;
    --prism-surface-raised: #EAEFF8;
    --prism-border: #AEBAD3;
    --prism-accent: #1A4FBF;
    --prism-accent-hover: #153F99;
    --prism-accent-pressed: #10337D;
    --prism-accent-ink: #FFFFFF;
    --prism-text: #0F1A30;
    --prism-muted: #46557A;
    --prism-disabled-text: #6B7893;
    --prism-risk-low: #047857;
    --prism-risk-elevated: #955300;
    --prism-risk-high: #B42318;
}
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        color-scheme: light;
        --prism-bg: #F6F8FC;
        --prism-surface: #FFFFFF;
        --prism-surface-raised: #EAEFF8;
        --prism-border: #AEBAD3;
        --prism-accent: #1A4FBF;
        --prism-accent-hover: #153F99;
        --prism-accent-pressed: #10337D;
        --prism-accent-ink: #FFFFFF;
        --prism-text: #0F1A30;
        --prism-muted: #46557A;
        --prism-disabled-text: #6B7893;
        --prism-risk-low: #047857;
        --prism-risk-elevated: #955300;
        --prism-risk-high: #B42318;
    }
}

/* Base */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; color-scheme: dark; }
body {
    margin: 0;
    background: var(--prism-bg);
    color: var(--prism-text);
    font-family: var(--prism-font-ui);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.55;
}
main:focus { outline: none; }
h1, h2, h3 { font-weight: 600; line-height: 1.25; }
a { color: var(--prism-accent); }
a:hover { color: var(--prism-accent-hover); }
:focus-visible { outline: 2px solid var(--prism-accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.mono { font-family: var(--prism-font-data); font-variant-numeric: tabular-nums; }

/* Logo */
.prism-mark { display: block; flex: none; color: var(--prism-accent); height: 1.75rem; width: auto; aspect-ratio: 260 / 100; }
.prism-logo { display: inline-flex; align-items: center; gap: 0.625rem; color: var(--prism-text); }
.prism-logo__text { display: flex; flex-direction: column; }
.prism-logo__word { font-family: var(--prism-font-ui); font-weight: 600; font-size: 1.25rem; letter-spacing: 0.08em; line-height: 1; }
.prism-logo__descriptor { margin-top: 0.375rem; font-size: 0.75rem; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--prism-muted); line-height: 1; }
.prism-logo--primary .prism-mark { height: 2.5rem; }
.prism-logo--primary .prism-logo__word { font-size: 1.75rem; }
.prism-logo--stacked { flex-direction: column; gap: 1rem; text-align: center; }
.prism-logo--stacked .prism-mark { height: 3.5rem; }
.prism-logo--stacked .prism-logo__text { align-items: center; }
.prism-logo--stacked .prism-logo__word { font-size: 1.75rem; }
.prism-logo--symbol .prism-mark { height: 2rem; }
.prism-logo--ink { color: #0B1220; }
.prism-logo--ink .prism-mark, .prism-logo--ink .prism-logo__descriptor { color: #0B1220; }
.prism-logo--white { color: #FFFFFF; }
.prism-logo--white .prism-mark, .prism-logo--white .prism-logo__descriptor { color: #FFFFFF; }

/* App header */
.prism-header { background: var(--prism-bg); border-bottom: 1px solid var(--prism-border); }
.theme-toggle { min-height: 44px; }
.prism-header__actions { display: flex; align-items: center; gap: var(--prism-space-2); margin-left: auto; }
.prism-header__actions form { margin: 0; }
.prism-header__inner {
    max-width: 1120px; margin: 0 auto; display: flex; flex-wrap: wrap; align-items: center; gap: var(--prism-space-2) var(--prism-space-6);
    padding: var(--prism-space-2) max(16px, env(safe-area-inset-right)) var(--prism-space-2) max(16px, env(safe-area-inset-left));
}
.prism-brand { display: inline-flex; align-items: center; gap: var(--prism-space-3); min-height: 44px; color: var(--prism-text); text-decoration: none; border-radius: var(--prism-radius-sm); }
.prism-brand:hover { color: var(--prism-text); }
.prism-brand .prism-mark { height: 2rem; }
.prism-brand__descriptor { padding-left: var(--prism-space-3); border-left: 1px solid var(--prism-border); color: var(--prism-muted); font-size: 0.8125rem; font-weight: 500; }
@media (max-width: 719px) { .prism-brand__descriptor { display: none; } }
.prism-nav { display: flex; flex-wrap: wrap; gap: var(--prism-space-1); }
.prism-nav a {
    display: inline-flex; align-items: center; min-height: 44px; padding: 0 var(--prism-space-3); color: var(--prism-muted);
    font-weight: 500; text-decoration: none; border-bottom: 2px solid transparent; border-radius: var(--prism-radius-sm) var(--prism-radius-sm) 0 0;
}
.prism-nav a:hover { color: var(--prism-text); background: var(--prism-surface); }
.prism-nav a[aria-current="page"] { color: var(--prism-accent); border-bottom-color: var(--prism-accent); }
.prism-header__machine { margin-left: auto; text-align: right; min-width: 0; overflow-wrap: anywhere; }
.prism-header__machine strong { display: block; font-size: 0.9375rem; font-weight: 600; }
.prism-header__machine span { color: var(--prism-muted); font-size: 0.8125rem; }
@media (max-width: 640px) { .prism-header__machine { margin-left: 0; text-align: left; flex-basis: 100%; } }

/* Buttons */
.btn, button.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--prism-space-2);
    min-height: 44px; padding: 8px 20px; font: inherit; font-weight: 500; line-height: 1.2; text-decoration: none; cursor: pointer;
    color: var(--prism-text); background: var(--prism-surface); border: 1px solid var(--prism-border); border-radius: var(--prism-radius-md);
}
.btn:hover { border-color: var(--prism-accent); color: var(--prism-text); }
.btn:active { background: var(--prism-surface-raised); }
.btn--primary, button.btn--primary { background: var(--prism-accent); border-color: var(--prism-accent); color: var(--prism-accent-ink); font-weight: 600; }
.btn--primary:hover { background: var(--prism-accent-hover); border-color: var(--prism-accent-hover); color: var(--prism-accent-ink); }
.btn--primary:active { background: var(--prism-accent-pressed); border-color: var(--prism-accent-pressed); }
.btn--tertiary, button.btn--tertiary { background: transparent; border-color: transparent; color: var(--prism-accent); padding-left: var(--prism-space-3); padding-right: var(--prism-space-3); }
.btn--tertiary:hover { background: var(--prism-surface); border-color: var(--prism-border); color: var(--prism-accent-hover); }
.btn[aria-pressed="true"] { background: var(--prism-surface-raised); border: 2px solid var(--prism-accent); color: var(--prism-text); font-weight: 600; padding: 7px 19px; }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--prism-surface); border-color: var(--prism-border); color: var(--prism-disabled-text); cursor: not-allowed; }
.btn[aria-busy="true"]::after {
    content: ""; width: 1em; height: 1em; border: 2px solid currentColor; border-right-color: transparent; border-radius: 50%; animation: prism-spin 0.8s linear infinite;
}
@keyframes prism-spin { to { transform: rotate(360deg); } }

/* Cards, badges, notices */
.card { background: var(--prism-surface); border: 1px solid var(--prism-border); border-radius: var(--prism-radius-lg); padding: var(--prism-space-6); }
.card > h2:first-child, .card-title { margin: 0 0 var(--prism-space-3); font-size: 1rem; font-weight: 600; color: var(--prism-text); }
.badge { display: inline-block; border: 1px solid var(--prism-accent); color: var(--prism-accent); border-radius: var(--prism-radius-sm); padding: 2px 10px; font-size: 0.75rem; font-weight: 600; letter-spacing: 0.06em; }
.notice { background: var(--prism-surface-raised); border: 1px solid var(--prism-border); border-left: 4px solid var(--prism-accent); border-radius: var(--prism-radius-md); padding: var(--prism-space-3) var(--prism-space-4); color: var(--prism-text); }
.notice[hidden] { display: none; }
.notice strong { display: block; }
.notice p { margin: 2px 0 0; color: var(--prism-muted); }

@media (pointer: coarse) { .btn { min-height: 48px; } }
@media (prefers-reduced-motion: reduce) {
    * { scroll-behavior: auto !important; }
    .btn[aria-busy="true"]::after { animation: none; }
}