/* ktstr.dev theme
 *
 * Loaded via additional-css after the stock mdBook stylesheets (the
 * toc iframe includes additional-css too, so these rules reach the
 * no-JS sidebar as well). Two surfaces are themed deliberately:
 * `.light` (default) and `.coal` (preferred dark). The other stock
 * themes remain selectable and usable, just unbranded.
 *
 * Fonts are vendored in theme/fonts/ (Inter + JetBrains Mono, OFL).
 */

/* ---------- global ---------- */

:root {
    --mono-font: "JetBrains Mono", ui-monospace, "Cascadia Code",
        Menlo, Consolas, "DejaVu Sans Mono", monospace;
    --code-font-size: 0.855em;
    --content-max-width: 780px;

    /* brand tokens (theme blocks override the resolved values) */
    --kt-accent: #2050c8;
    --kt-accent-soft: rgba(32, 80, 200, 0.09);
    --kt-rule: rgba(15, 23, 42, 0.1);
    --kt-chip-bg: rgba(15, 23, 42, 0.055);
    --kt-heading: #171b26;
}

html {
    font-family: "Inter", ui-sans-serif, system-ui, -apple-system,
        "Segoe UI", Roboto, sans-serif;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    font-feature-settings: "cv05", "cv08", "ss03";
}

body {
    font-family: inherit;
}

/* ---------- palettes ---------- */

.light,
html:not(.js) {
    --bg: #ffffff;
    --fg: #2a2f3a;

    --sidebar-bg: #fafafb;
    --sidebar-fg: #454c59;
    --sidebar-non-existant: #b0b6c0;
    --sidebar-active: #2050c8;
    --sidebar-spacer: #e3e5e9;

    --scrollbar: #c9cdd4;

    --icons: #9aa0ab;
    --icons-hover: #2a2f3a;

    --links: #2050c8;

    --inline-code-color: #37405a;

    --theme-popup-bg: #ffffff;
    --theme-popup-border: #d8dbe1;
    --theme-hover: #f1f2f5;

    --quote-bg: #f7f8fa;
    --quote-border: #e4e6eb;

    --table-border-color: #e4e6eb;
    --table-header-bg: #f4f5f7;
    --table-alternate-bg: #fafafb;

    --searchbar-border-color: #d8dbe1;
    --searchbar-bg: #f4f5f7;
    --searchbar-fg: #2a2f3a;
    --searchbar-shadow-color: transparent;
    --searchresults-header-fg: #6b7280;
    --searchresults-border-color: #e4e6eb;
    --searchresults-li-bg: #f7f8fa;
    --search-mark-bg: #ffe9a8;

    --footnote-highlight: #2050c8;
    --sidebar-header-border-color: #e3e5e9;

    --kt-accent: #2050c8;
    --kt-accent-soft: rgba(32, 80, 200, 0.09);
    --kt-rule: rgba(15, 23, 42, 0.1);
    --kt-chip-bg: rgba(15, 23, 42, 0.055);
    --kt-heading: #171b26;
}

.coal {
    --bg: #0e1116;
    --fg: #c6cdd8;

    --sidebar-bg: #0a0d12;
    --sidebar-fg: #99a3b3;
    --sidebar-non-existant: #4b5563;
    --sidebar-active: #8ab0ff;
    --sidebar-spacer: #1d232e;

    --scrollbar: #333c4d;

    --icons: #5d6878;
    --icons-hover: #c6cdd8;

    --links: #7fa7ff;

    --inline-code-color: #c2cbe0;

    --theme-popup-bg: #151a22;
    --theme-popup-border: #2a3342;
    --theme-hover: #1a2029;

    --quote-bg: #141922;
    --quote-border: #232b38;

    --table-border-color: #232b38;
    --table-header-bg: #1a2029;
    --table-alternate-bg: #12161d;

    --searchbar-border-color: #2a3342;
    --searchbar-bg: #151a22;
    --searchbar-fg: #c6cdd8;
    --searchbar-shadow-color: transparent;
    --searchresults-header-fg: #8b93a5;
    --searchresults-border-color: #2a3342;
    --searchresults-li-bg: #151a22;
    --search-mark-bg: #3b4d7a;

    --footnote-highlight: #7fa7ff;
    --sidebar-header-border-color: #1d232e;

    --kt-accent: #8ab0ff;
    --kt-accent-soft: rgba(138, 176, 255, 0.1);
    --kt-rule: rgba(148, 163, 184, 0.16);
    --kt-chip-bg: rgba(148, 163, 184, 0.1);
    --kt-heading: #e8ecf3;
}

/* ---------- typography ---------- */

.content main {
    line-height: 1.65;
}

.content h1,
.content h2,
.content h3,
.content h4 {
    font-family: inherit;
    color: var(--kt-heading);
    font-weight: 650;
    letter-spacing: -0.015em;
    line-height: 1.25;
}

.content h1 {
    font-size: 3.2rem;
    letter-spacing: -0.022em;
    margin-block-start: 0.4em;
}

.content h2 {
    font-size: 2.2rem;
    margin-block-start: 2.1em;
}

.content h3 {
    font-size: 1.8rem;
    margin-block-start: 1.8em;
}

.content a {
    text-decoration: none;
}

.content a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* ---------- code ---------- */

.content pre {
    border: 1px solid var(--kt-rule);
    border-radius: 10px;
    line-height: 1.55;
}

.light .content pre > code.hljs {
    background: #f7f8fa;
}

.content :not(pre) > code {
    background: var(--kt-chip-bg);
    border-radius: 5px;
    padding: 0.1em 0.35em;
    font-size: 0.84em;
    font-weight: 450;
}

/* keep chips readable inside links and headings */
.content a > code {
    color: var(--links);
    background: var(--kt-accent-soft);
}

.content h1 code,
.content h2 code,
.content h3 code {
    background: none;
    padding: 0;
    font-size: 0.95em;
}

/* ---------- tables ---------- */

.content table {
    font-size: 1.5rem;
}

.content table th {
    font-weight: 600;
}

/* ---------- sidebar ---------- */

.sidebar {
    font-size: 1.4rem;
}

.sidebar .sidebar-scrollbox,
body.sidebar-iframe-inner {
    padding: 14px 10px;
}

#sidebar,
.sidebar-iframe-outer {
    border-right: 1px solid var(--kt-rule);
}

.chapter li.part-title {
    text-transform: uppercase;
    font-size: 1.1rem;
    font-weight: 650;
    letter-spacing: 0.09em;
    color: var(--sidebar-fg);
    opacity: 0.62;
    margin: 1.6em 0 0.4em;
}

.chapter li.chapter-item {
    line-height: 1.9;
    margin-block-start: 0.2rem;
}

.chapter .chapter-link-wrapper {
    border-radius: 6px;
}

.chapter .chapter-link-wrapper:hover {
    background: var(--theme-hover);
}

.chapter li a {
    padding: 1px 8px;
    border-radius: 6px;
}

.chapter li a.active {
    color: var(--sidebar-active);
    font-weight: 560;
    background: var(--kt-accent-soft);
}

/* ---------- menu bar ---------- */

#mdbook-menu-bar {
    border-block-end: 1px solid var(--kt-rule);
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

#mdbook-menu-bar h1.menu-title {
    font-family: var(--mono-font);
    font-weight: 700;
    letter-spacing: -0.03em;
    font-size: 1.9rem;
    background: linear-gradient(92deg, var(--kt-heading) 20%, var(--kt-accent) 62%, #7c5cff 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ---------- landing page components ----------
 * Used from raw HTML embedded in markdown pages. */

.kt-hero {
    position: relative;
    margin: 3rem 0 3.4rem;
}

/* soft radial glow behind the hero, clipped to the content column */
.kt-hero::before {
    content: "";
    position: absolute;
    inset: -6rem -4rem auto -4rem;
    height: 24rem;
    background:
        radial-gradient(38rem 18rem at 18% 20%,
            color-mix(in srgb, var(--kt-accent) 14%, transparent), transparent 70%),
        radial-gradient(30rem 16rem at 75% 0%,
            color-mix(in srgb, #7c5cff 10%, transparent), transparent 70%);
    pointer-events: none;
    z-index: -1;
}

.kt-hero h1 {
    font-family: var(--mono-font);
    font-size: 5.4rem;
    font-weight: 700;
    letter-spacing: -0.04em;
    line-height: 1.05;
    margin: 0 0 0.3em;
    width: fit-content;
    background: linear-gradient(100deg,
        var(--kt-heading) 12%, var(--kt-accent) 45%, #7c5cff 62%,
        var(--kt-accent) 80%, var(--kt-heading) 100%);
    background-size: 220% 100%;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: kt-hue-drift 10s ease-in-out infinite alternate;
}

@keyframes kt-hue-drift {
    from { background-position: 0% 50%; }
    to { background-position: 100% 50%; }
}

@media (prefers-reduced-motion: reduce) {
    .kt-hero h1 { animation: none; }
}

.kt-hero .kt-tagline {
    font-size: 1.9rem;
    line-height: 1.55;
    color: var(--fg);
    opacity: 0.85;
    max-width: 38em;
    margin: 0 0 1.4em;
}

.kt-cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
    align-items: center;
}

a.kt-btn {
    display: inline-block;
    padding: 0.55em 1.1em;
    border-radius: 8px;
    font-weight: 560;
    font-size: 1.5rem;
    text-decoration: none;
    border: 1px solid transparent;
    transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease, filter 0.12s ease;
}

a.kt-btn:hover {
    transform: translateY(-1px);
}

a.kt-btn:hover {
    text-decoration: none;
}

.content a.kt-btn-primary,
a.kt-btn-primary {
    background: linear-gradient(135deg, var(--kt-accent), color-mix(in srgb, var(--kt-accent) 72%, #7c5cff));
    color: #ffffff;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.2), 0 4px 14px color-mix(in srgb, var(--kt-accent) 30%, transparent);
}

a.kt-btn-primary:hover {
    filter: brightness(1.1);
}

.content a.kt-btn-ghost,
a.kt-btn-ghost {
    border-color: var(--kt-rule);
    color: var(--fg);
}

a.kt-btn-ghost:hover {
    border-color: var(--kt-accent);
    color: var(--kt-accent);
}

.kt-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
    gap: 0.9rem;
    margin: 1.6rem 0;
}

.kt-card {
    border: 1px solid var(--kt-rule);
    border-radius: 12px;
    padding: 1.4rem 1.5rem;
    background: linear-gradient(180deg, color-mix(in srgb, var(--kt-accent) 3%, transparent), transparent 45%);
    transition: transform 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease;
}

.kt-card:hover {
    transform: translateY(-2px);
    border-color: color-mix(in srgb, var(--kt-accent) 45%, var(--kt-rule));
    box-shadow: 0 6px 22px color-mix(in srgb, var(--kt-accent) 12%, transparent);
}

.kt-card h3 {
    margin: 0 0 0.35em;
    font-size: 1.55rem;
    font-weight: 650;
    color: var(--kt-heading);
}

.kt-card p {
    margin: 0;
    font-size: 1.4rem;
    line-height: 1.55;
    opacity: 0.85;
}

.kt-card a {
    font-size: 1.35rem;
}

/* ---------- terminal frames ----------
 * Dark in both themes, like a real terminal. Content goes in a
 * <pre> so long lines scroll horizontally inside the frame. */

.kt-term {
    background: linear-gradient(180deg, #11151f 0%, #0d1017 3.2rem);
    border: 1px solid #232b3b;
    border-radius: 12px;
    margin: 1.6rem 0;
    overflow: hidden;
    box-shadow: 0 1px 2px rgba(2, 6, 16, 0.4), 0 12px 34px rgba(2, 6, 16, 0.35);
}

.kt-term-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 0.9rem;
    border-block-end: 1px solid #1f2633;
}

.kt-term-bar::before {
    content: "";
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: #f4655f;
    box-shadow: 15px 0 0 #f9bd4e, 30px 0 0 #43c645;
    margin-inline-end: 30px;
    flex: none;
    opacity: 0.9;
}

.kt-term-title {
    font-family: var(--mono-font);
    font-size: 1.15rem;
    color: #7d8aa5;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.kt-term pre {
    margin: 0;
    padding: 0.9rem 1.1rem;
    background: transparent !important;
    border: none;
    border-radius: 0;
    font-family: var(--mono-font);
    font-size: 1.25rem;
    line-height: 1.55;
    color: #c9d4e5;
    overflow-x: auto;
}

.kt-term pre code {
    background: transparent !important;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

/* ANSI-ish highlight spans for captured output */
.kt-term .t-red { color: #ff6b7d; }
.kt-term .t-grn { color: #7ed491; }
.kt-term .t-yel { color: #f5c96d; }
.kt-term .t-blu { color: #7fa7ff; }
.kt-term .t-mag { color: #c79bf2; }
.kt-term .t-cyn { color: #6fd7e3; }
.kt-term .t-dim { color: #64708a; }
.kt-term .t-b { font-weight: 700; color: #e8eefb; }
.kt-term .t-err {
    color: #ff6b7d;
    font-weight: 700;
}

/* ---------- misc polish ---------- */

.content blockquote {
    border-radius: 0 8px 8px 0;
}

.nav-chapters {
    border-radius: 10px;
}

mark {
    border-radius: 3px;
}

/* ---------- card icons & figures ---------- */

.kt-card > svg {
    width: 24px;
    height: 24px;
    stroke: var(--kt-accent);
    fill: none;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
    margin-bottom: 0.2rem;
}

.kt-card > svg .fill {
    fill: var(--kt-accent);
    stroke: none;
}

.kt-figure {
    margin: 1.6rem 0;
    overflow-x: auto;
}

.kt-figure svg {
    max-width: 100%;
    height: auto;
    font-family: var(--mono-font);
}
