/* Grata Cascade — paper-companion academic styling.
 * Inspirace: Distill.pub, IACR ePrint, IETF drafts.
 * Override Bootstrap 5 defaults: serif body, neutral palette, low chrome,
 * narrow content column, generous whitespace.
 *
 * Načteno PO Bootstrap CSS v index.html — kaskáda přebíjí jeho defaulty.
 */

/* ── Design tokens ──────────────────────────────────────────────────── */
:root {
    /* Palette — single accent ink, jinak grayscale. */
    --gc-ink:        #1a1a1a;
    --gc-ink-muted: #555;
    --gc-rule:       #d4d4d4;
    --gc-bg:         #fbfaf7;          /* warm off-white, paper-like */
    --gc-bg-card:    #ffffff;
    --gc-accent:     #1f4e79;          /* muted academic blue */
    --gc-accent-faint: #e8eef5;
    --gc-success:    #2d6a4f;          /* deep forest green pro Final */
    --gc-warning:    #9a6500;
    --gc-danger:     #842029;

    /* Typography. */
    --gc-serif:      'Charter', 'Iowan Old Style', 'Palatino Linotype',
                     'Palatino', 'URW Palladio L', Georgia, 'Times New Roman', serif;
    --gc-sans:       system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI',
                     Roboto, 'Helvetica Neue', Arial, sans-serif;
    --gc-mono:       'JetBrains Mono', 'IBM Plex Mono', Consolas, 'SF Mono',
                     'Courier New', monospace;

    /* Spacing scale (paper feel = generous). */
    --gc-content-max: 720px;
    --gc-wide-max:    1080px;
}

/* ── Body / typography baseline ─────────────────────────────────────── */
html, body {
    background: var(--gc-bg);
    color: var(--gc-ink);
    font-family: var(--gc-serif);
    font-size: 17px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--gc-sans);
    font-weight: 600;
    color: var(--gc-ink);
    letter-spacing: -0.01em;
}

/* Blazor <FocusOnNavigate Selector="h1"> programmaticky fokusuje h1
   po každé navigaci kvůli a11y (screen reader landmark) — nastavuje
   tabindex="-1" + .focus(). Browser pak ale přidá focus outline,
   vizuálně rušivý rámeček.
   `:not(:focus-visible)` heuristika je nespolehlivá (Chromium někdy
   označí navigation-induced focus jako visible). Spolehlivější:
   cílit přímo na tabindex="-1" h1 (FocusOnNavigate ho tam vždy
   nastaví) — keyboard tab navigation h1 nepoužívá. */
h1[tabindex="-1"]:focus,
h1:focus:not(:focus-visible) {
    outline: none;
    box-shadow: none;
}

h1 { font-size: 2rem; line-height: 1.2; margin-top: 0; margin-bottom: 1rem; }
h2 { font-size: 1.45rem; line-height: 1.3; margin-top: 2rem; margin-bottom: 0.75rem; }
h3 { font-size: 1.15rem; line-height: 1.4; margin-top: 1.5rem; margin-bottom: 0.5rem; }
h5 { font-size: 1.05rem; font-weight: 600; }

p { margin-bottom: 1rem; }
small, .small { color: var(--gc-ink-muted); }

a {
    color: var(--gc-accent);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
    transition: color 150ms ease;
}
a:hover { color: var(--gc-ink); }

code, pre, .text-monospace {
    font-family: var(--gc-mono);
    font-size: 0.9em;
}

/* ── Layout containers ──────────────────────────────────────────────── */
.gc-narrow {
    max-width: var(--gc-content-max);
    margin-left: auto;
    margin-right: auto;
}

.gc-wide {
    max-width: var(--gc-wide-max);
    margin-left: auto;
    margin-right: auto;
}

main.container {
    max-width: var(--gc-wide-max);
}

/* ── Public testbed banner (jen na live demu, ne na localhost) ──────── */
.gc-testbed-banner {
    background: var(--gc-accent-faint);
    border-bottom: 1px solid var(--gc-rule);
    color: var(--gc-ink);
    font-family: var(--gc-sans);
    font-size: 0.85rem;
    line-height: 1.4;
}

.gc-testbed-banner-inner {
    max-width: var(--gc-wide-max);
    margin: 0 auto;
    padding: 0.5rem 1.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.75rem;
}

.gc-testbed-badge {
    background: var(--gc-accent);
    color: #fff;
    padding: 0.1rem 0.5rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: uppercase;
    flex-shrink: 0;
}

.gc-testbed-text {
    color: var(--gc-ink-muted);
}

/* ── Header (project nav) ───────────────────────────────────────────── */
.gc-header {
    border-bottom: 1px solid var(--gc-rule);
    background: var(--gc-bg);
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.gc-header-inner {
    max-width: var(--gc-wide-max);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}

.gc-brand {
    font-family: var(--gc-sans);
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--gc-ink);
    text-decoration: none;
}

.gc-brand:hover { color: var(--gc-accent); }

.gc-brand-suffix {
    font-weight: 400;
    color: var(--gc-ink-muted);
    margin-left: 0.4rem;
    font-size: 0.95rem;
}

.gc-nav {
    display: flex;
    gap: 1.25rem;
    font-family: var(--gc-sans);
    font-size: 0.95rem;
}

.gc-nav a {
    color: var(--gc-ink-muted);
    text-decoration: none;
}

.gc-nav a:hover, .gc-nav a.active {
    color: var(--gc-accent);
    text-decoration: underline;
    text-underline-offset: 4px;
}

/* Lang toggle button (CS / EN) — v stylu odkazů, ale clickable. */
.gc-lang-toggle {
    background: none;
    border: 1px solid var(--gc-rule);
    padding: 0.15rem 0.5rem;
    border-radius: 3px;
    font-family: var(--gc-sans);
    font-size: 0.85rem;
    color: var(--gc-ink-muted);
    cursor: pointer;
    transition: border-color 120ms ease;
}

.gc-lang-toggle:hover {
    border-color: var(--gc-accent);
}

.gc-lang-toggle .active {
    color: var(--gc-accent);
    font-weight: 600;
}

.gc-lang-sep {
    margin: 0 0.25rem;
    color: var(--gc-rule);
}

/* ── Footer ─────────────────────────────────────────────────────────── */
.gc-footer {
    border-top: 1px solid var(--gc-rule);
    margin-top: 4rem;
    padding: 1.5rem 0;
    color: var(--gc-ink-muted);
    font-size: 0.875rem;
    font-family: var(--gc-sans);
}

.gc-footer-inner {
    max-width: var(--gc-wide-max);
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: space-between;
}

/* ── Bootstrap overrides — buttons ──────────────────────────────────── */
.btn {
    font-family: var(--gc-sans);
    font-weight: 500;
    border-radius: 3px;
    transition: all 120ms ease;
}

.btn-primary {
    background-color: var(--gc-accent);
    border-color: var(--gc-accent);
}

.btn-primary:hover, .btn-primary:focus {
    background-color: #163e62;
    border-color: #163e62;
}

.btn-success {
    background-color: var(--gc-success);
    border-color: var(--gc-success);
}

.btn-outline-primary {
    color: var(--gc-accent);
    border-color: var(--gc-accent);
}

.btn-outline-primary:hover {
    background-color: var(--gc-accent);
    border-color: var(--gc-accent);
}

.btn-outline-secondary {
    color: var(--gc-ink-muted);
    border-color: var(--gc-rule);
}

.btn-outline-secondary:hover {
    background-color: var(--gc-ink);
    border-color: var(--gc-ink);
    color: var(--gc-bg);
}

.btn-outline-danger {
    color: var(--gc-danger);
    border-color: var(--gc-danger);
}

.btn-link {
    color: var(--gc-accent);
}

/* CTA — landing "Spustit demo". */
.gc-cta {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-family: var(--gc-sans);
    font-size: 1rem;
    font-weight: 500;
    background: var(--gc-ink);
    color: var(--gc-bg) !important;
    text-decoration: none;
    border-radius: 3px;
    transition: background 150ms ease;
}

.gc-cta:hover {
    background: var(--gc-accent);
    color: var(--gc-bg) !important;
}

/* ── Bootstrap overrides — cards ────────────────────────────────────── */
.card {
    background: var(--gc-bg-card);
    border: 1px solid var(--gc-rule);
    border-radius: 4px;
    box-shadow: none;
}

.card-header {
    background: var(--gc-bg);
    border-bottom: 1px solid var(--gc-rule);
    font-family: var(--gc-sans);
    font-weight: 600;
    font-size: 0.95rem;
}

.card-header.bg-primary, .card-header.bg-success {
    color: var(--gc-bg-card);
}

.card-header.bg-primary { background: var(--gc-accent) !important; }
.card-header.bg-success { background: var(--gc-success) !important; }
.card-header.bg-light    { background: var(--gc-bg) !important; color: var(--gc-ink); }

.card-body dt {
    font-family: var(--gc-sans);
    font-weight: 500;
    color: var(--gc-ink-muted);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-body dd {
    font-family: var(--gc-mono);
    margin-bottom: 0.5rem;
    color: var(--gc-ink);
}

/* ── Alerts ─────────────────────────────────────────────────────────── */
.alert {
    border-radius: 4px;
    border-width: 1px;
    border-left-width: 3px;
    background: var(--gc-bg-card);
}

.alert-success { border-left-color: var(--gc-success); color: var(--gc-ink); }
.alert-warning { border-left-color: var(--gc-warning); color: var(--gc-ink); }
.alert-danger  { border-left-color: var(--gc-danger);  color: var(--gc-ink); }
.alert-info    { border-left-color: var(--gc-accent);  color: var(--gc-ink); }
.alert-primary { border-left-color: var(--gc-accent);  color: var(--gc-ink); }
.alert-secondary { border-left-color: var(--gc-rule);  color: var(--gc-ink); }

/* ── Badges ─────────────────────────────────────────────────────────── */
.badge {
    font-family: var(--gc-sans);
    font-weight: 500;
    padding: 0.35em 0.6em;
    border-radius: 3px;
}

.badge.bg-primary   { background-color: var(--gc-accent) !important; }
.badge.bg-success   { background-color: var(--gc-success) !important; }
.badge.bg-secondary { background-color: var(--gc-ink-muted) !important; }
.badge.bg-info      { background-color: var(--gc-accent-faint) !important;
                      color: var(--gc-accent) !important; }
.badge.bg-warning   { background-color: #fdf2cd !important;
                      color: var(--gc-warning) !important; }

/* ── Progress bar ───────────────────────────────────────────────────── */
.progress {
    background: var(--gc-bg);
    border: 1px solid var(--gc-rule);
    border-radius: 3px;
    height: 16px !important;
    font-family: var(--gc-mono);
    font-size: 0.75rem;
}

.progress-bar.bg-success { background-color: var(--gc-success) !important; }
.progress-bar.bg-warning { background-color: var(--gc-warning) !important; color: var(--gc-bg); }

/* ── List groups (lobby seznam) ─────────────────────────────────────── */
.list-group-item {
    border-color: var(--gc-rule);
    background: var(--gc-bg-card);
}

/* ── Code / hashes ──────────────────────────────────────────────────── */
pre, code {
    color: var(--gc-ink);
}

pre {
    background: var(--gc-bg);
    border: 1px solid var(--gc-rule);
    padding: 1rem;
    border-radius: 4px;
    font-size: 0.85rem;
}

/* ── Math-style figure caption ──────────────────────────────────────── */
.gc-caption {
    font-family: var(--gc-sans);
    font-size: 0.85rem;
    color: var(--gc-ink-muted);
    text-align: center;
    margin-top: 0.5rem;
    font-style: italic;
}

/* ── Resource list (landing "Zdroje" sekce) ─────────────────────────── */
.gc-resource-list {
    list-style: none;
    padding-left: 0;
    font-family: var(--gc-sans);
}

.gc-resource-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--gc-rule);
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 1rem;
}

.gc-resource-list li:last-child { border-bottom: none; }

.gc-resource-label {
    font-weight: 500;
    color: var(--gc-ink);
}

.gc-resource-meta {
    color: var(--gc-ink-muted);
    font-size: 0.85rem;
}

/* ── Disclaimer card (paper §1.5 prominent) ─────────────────────────── */
.gc-disclaimer {
    border: 1px solid var(--gc-warning);
    border-left-width: 4px;
    background: #fffbeb;
    padding: 1rem 1.25rem;
    border-radius: 4px;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.gc-disclaimer-title {
    font-family: var(--gc-sans);
    font-weight: 600;
    color: var(--gc-warning);
    margin-bottom: 0.4rem;
}

/* ── Drobnější polish ───────────────────────────────────────────────── */
hr { border-color: var(--gc-rule); opacity: 1; }

table {
    font-size: 0.95rem;
}

table thead th {
    font-family: var(--gc-sans);
    font-weight: 600;
    border-bottom: 2px solid var(--gc-ink) !important;
}

/* ── Personal accent color (--gc-own-color) ─────────────────────────── */
/* CSS custom properties nastavované inline na .gc-personalized wrapperu
   z Driver.OwnHandle. Vlastní barva uživatele se promítá do status
   badge, progress baru a LOCAL panel headeru. PEER panel je neutrální
   (Bootstrap default), peer's barva žije jen ve swatchi vedle handle
   name — záměr: "na jedné stránce vidím jen svoji barvu". */

.gc-bg-own {
    background-color: var(--gc-own-color, var(--gc-accent)) !important;
    color: var(--gc-own-color-on, #fff) !important;
    border-color: var(--gc-own-color, var(--gc-accent)) !important;
}

.gc-border-own {
    border-color: var(--gc-own-color, var(--gc-rule)) !important;
}

/* Progress bar fill: rebindne Bootstrap CSS custom property
   --bs-progress-bar-bg na vlastní barvu. Bootstrap používá tuto
   var v .progress-bar { background-color: var(--bs-progress-bar-bg); },
   takže tohle propíše bez specificity bojů. Analogicky barva textu
   uvnitř baru (Round number).
   Aplikuje se POUZE uvnitř .gc-personalized wrapperu. */
.gc-personalized .progress {
    --bs-progress-bar-bg: var(--gc-own-color, var(--gc-success));
    --bs-progress-bar-color: var(--gc-own-color-on, #fff);
}

/* Belt-and-suspenders pro případ, že Bootstrap má jinou cestu. */
.gc-personalized .progress-bar.gc-own-fill {
    background-color: var(--gc-own-color, var(--gc-success)) !important;
    color: var(--gc-own-color-on, #fff) !important;
}

/* Badge varianta — uvnitř personalized wrapperu vyšší specificity
   abychom přebili případné Bootstrap utility classes. */
.gc-personalized .badge.gc-bg-own {
    background-color: var(--gc-own-color, var(--gc-accent)) !important;
    color: var(--gc-own-color-on, #fff) !important;
}

/* Card header v gc-bg-own drží tučný look + nuance. */
.card-header.gc-bg-own {
    border-bottom: 1px solid currentColor;
}

/* ── Handle swatch (color tečka vedle handle name) ──────────────────── */
.gc-swatch {
    display: inline-block;
    width: 0.85em;
    height: 0.85em;
    border-radius: 50%;
    margin-right: 0.4em;
    vertical-align: -0.05em;
    flex-shrink: 0;
}

.gc-swatch.bordered {
    border: 1px solid var(--gc-rule);
}

.gc-handle-with-swatch {
    display: inline-flex;
    align-items: center;
    gap: 0;
    font-family: var(--gc-mono);
    font-weight: 600;
    color: var(--gc-ink);
}

/* ── Success-on-top: prominent K* + Safety Number card ──────────────── */
.gc-success-top {
    border: 2px solid var(--gc-success);
    background: linear-gradient(180deg, #ecfdf5 0%, #ffffff 100%);
    border-radius: 6px;
    padding: 1.5rem 1.75rem;
    margin: 0 0 1.5rem 0;
    animation: success-pulse 1200ms ease-out;
}

@keyframes success-pulse {
    0%   { box-shadow: 0 0 0 0 rgba(45, 106, 79, 0.5); transform: scale(0.985); }
    50%  { box-shadow: 0 0 18px 6px rgba(45, 106, 79, 0.25); transform: scale(1); }
    100% { box-shadow: 0 0 0 0 rgba(45, 106, 79, 0); transform: scale(1); }
}

.gc-success-title {
    font-family: var(--gc-sans);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--gc-success);
    margin: 0 0 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.gc-success-title::before {
    content: "✓";
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.6rem;
    height: 1.6rem;
    background: var(--gc-success);
    color: white;
    border-radius: 50%;
    font-size: 1rem;
    font-weight: 700;
}

.gc-safety-block {
    background: white;
    border: 1px solid var(--gc-rule);
    border-radius: 4px;
    padding: 1rem 1.25rem;
    margin: 0.75rem 0;
}

.gc-safety-label {
    font-family: var(--gc-sans);
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gc-ink-muted);
    margin-bottom: 0.4rem;
}

.gc-safety-value {
    font-family: var(--gc-mono);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--gc-success);
    line-height: 1.2;
}

.gc-kstar-block {
    background: white;
    border: 1px solid var(--gc-rule);
    border-radius: 4px;
    padding: 1rem 1.25rem;
    margin: 0.75rem 0 0 0;
}

/* Verify callout uvnitř success cardu — vysvětluje, co Final
   garantuje a co ne (paper §1.5 passive vs active MITM). Tlumený
   yellow tint odlišuje od jistoty zeleného rámečku. */
.gc-verify-note {
    background: rgba(253, 242, 205, 0.6);
    border-left: 3px solid var(--gc-warning);
    padding: 0.75rem 1rem;
    border-radius: 4px;
    margin: 1rem 0;
    font-size: 0.95rem;
    line-height: 1.55;
}

.gc-verify-note-title {
    font-family: var(--gc-sans);
    font-weight: 600;
    color: var(--gc-warning);
    margin: 0 0 0.4rem 0;
    font-size: 0.95rem;
}

.gc-kstar-value {
    font-family: var(--gc-mono);
    font-size: 0.95rem;
    line-height: 1.5;
    word-break: break-all;
    color: var(--gc-ink);
    margin: 0;
    /* Group hex 4-by-4 visually for OOB compare. Achieved via letter
       spacing — pairs are ToHex output, browser word-wraps as needed. */
}

/* ── Mobile ─────────────────────────────────────────────────────────── */
@media (max-width: 575px) {
    html, body { font-size: 16px; }
    h1 { font-size: 1.6rem; }
    h2 { font-size: 1.25rem; }
    .gc-header-inner { padding: 0 1rem; }
    .gc-nav { gap: 0.75rem; font-size: 0.875rem; }
}