/* ================================================================
   Pipelet Design System — Momentum lightBronzeWebex theme
   Shared tokens + primitive components across the Pipelet suite.
   Header chrome lives in pipelet-shared-ui/app-switcher/pipelet-header.css.
   ================================================================ */

/* Self-hosted fonts — no external requests */
@font-face { font-family:'Source Serif 4'; font-style:italic; font-weight:400; font-display:swap; src:url('/static/fonts/source-serif-4-400-italic.ttf') format('truetype'); }
@font-face { font-family:'Source Serif 4'; font-style:italic; font-weight:700; font-display:swap; src:url('/static/fonts/source-serif-4-700-italic.ttf') format('truetype'); }
@font-face { font-family:'Source Serif 4'; font-style:normal; font-weight:300; font-display:swap; src:url('/static/fonts/source-serif-4-300.ttf') format('truetype'); }
@font-face { font-family:'Source Serif 4'; font-style:normal; font-weight:400; font-display:swap; src:url('/static/fonts/source-serif-4-400.ttf') format('truetype'); }
@font-face { font-family:'Source Serif 4'; font-style:normal; font-weight:500; font-display:swap; src:url('/static/fonts/source-serif-4-500.ttf') format('truetype'); }
@font-face { font-family:'Source Serif 4'; font-style:normal; font-weight:700; font-display:swap; src:url('/static/fonts/source-serif-4-700.ttf') format('truetype'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:400; font-display:swap; src:url('/static/fonts/inter-400.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:500; font-display:swap; src:url('/static/fonts/inter-500.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:600; font-display:swap; src:url('/static/fonts/inter-600.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:700; font-display:swap; src:url('/static/fonts/inter-700.woff2') format('woff2'); }
@font-face { font-family:'Inter'; font-style:normal; font-weight:800; font-display:swap; src:url('/static/fonts/inter-800.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:400; font-display:swap; src:url('/static/fonts/jetbrains-mono-400.woff2') format('woff2'); }
@font-face { font-family:'JetBrains Mono'; font-style:normal; font-weight:500; font-display:swap; src:url('/static/fonts/jetbrains-mono-500.woff2') format('woff2'); }

:root {
    --gray-5:   #f7f7f7;
    --gray-10:  #ededed;
    --gray-20:  #dedede;
    --gray-50:  #8f8f8f;

    --bg-solid:          #ffffff;
    --bg-secondary:      #f7f7f7;
    --bg-tertiary:       #ededed;
    --bg-gradient:       linear-gradient(180deg, #f5efe4 0%, #ffffff 100%);
    --bg-gradient-sub:   linear-gradient(180deg, #fcfaf4 0%, #ffffff 100%);
    --bg-surface:        #ffffff;
    --bg-surface-hover:  rgba(0, 0, 0, 0.03);
    --bg-surface-active: rgba(0, 0, 0, 0.06);
    --bg-glass:          rgba(255, 255, 255, 0.82);

    --text-primary:   rgba(0, 0, 0, 0.95);
    --text-secondary: rgba(0, 0, 0, 0.70);
    --text-disabled:  rgba(0, 0, 0, 0.40);

    --accent:       #1170cf;
    --accent-hover: #0353a8;
    --accent-muted: rgba(17, 112, 207, 0.08);

    --positive:       #1d805f;
    --positive-muted: #cef5eb;
    --negative:       #db1f2e;
    --warning:        #a65e00;
    --warning-muted:  rgba(166, 94, 0, 0.10);

    --border-subtle: rgba(0, 0, 0, 0.08);
    --border-normal: rgba(0, 0, 0, 0.13);
    --border-hover:  rgba(0, 0, 0, 0.20);
    --border-focus:  var(--accent);

    --elevation-1: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --elevation-2: 0 4px 12px rgba(0,0,0,0.08);
    --elevation-3: 0 8px 24px rgba(0,0,0,0.10);

    --font-serif: "GT Alpina", "Source Serif 4", Georgia, "Times New Roman", serif;
    --font-sans:  "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono:  "JetBrains Mono", ui-monospace, Menlo, monospace;

    --text-xs:  11px;
    --text-sm:  13px;
    --text-base: 14px;
    --text-md:  15px;
    --text-lg:  17px;
    --text-xl:  20px;
    --text-2xl: 28px;
    --text-3xl: 36px;
    --text-4xl: 48px;

    --sp-1: 4px;  --sp-2: 8px;   --sp-3: 12px;
    --sp-4: 16px; --sp-5: 20px;  --sp-6: 24px;
    --sp-7: 32px; --sp-8: 40px;  --sp-9: 48px;
    --sp-10: 64px;

    --radius-xs:   4px;
    --radius-sm:   6px;
    --radius-md:   8px;
    --radius-lg:   12px;
    --radius-pill: 9999px;

    --ease: cubic-bezier(0.16, 1, 0.3, 1);
    --dur-fast: 120ms;
    --dur-norm: 180ms;

    color-scheme: light;

    /* Shared header aliases used by pipelet-shared-ui. */
    --color-bg-primary: var(--bg-surface);
    --color-bg-secondary: var(--bg-secondary);
    --color-bg-tertiary: var(--bg-tertiary);
    --color-bg-glass: var(--bg-glass);
    --color-bg-active: var(--bg-surface-active);
    --color-bg-error-subtle: rgba(219, 31, 46, 0.08);
    --color-border: var(--border-normal);
    --color-border-primary: var(--border-hover);
    --color-border-secondary: var(--border-subtle);
    --color-text-primary: var(--text-primary);
    --color-text-secondary: var(--text-secondary);
    --color-text-tertiary: var(--text-disabled);
    --color-text-quaternary: var(--text-disabled);
    --brand-500: var(--accent);
    --error-500: var(--negative);
    --spacing-xs: var(--sp-1);
    --spacing-md: var(--sp-2);
    --spacing-lg: var(--sp-3);
    --spacing-xl: var(--sp-4);
    --spacing-3xl: var(--sp-6);
    --font-family-serif: var(--font-serif);
    --font-family: var(--font-sans);
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
}

[data-theme="dark"] {
    color-scheme: dark;

    --gray-5:   #171717;
    --gray-10:  #24211d;
    --gray-20:  #37322c;
    --gray-50:  #a8a29a;

    --bg-solid:          #101010;
    --bg-secondary:      #151311;
    --bg-tertiary:       #211d18;
    --bg-gradient:       linear-gradient(180deg, #1e1710 0%, #101113 100%);
    --bg-gradient-sub:   linear-gradient(180deg, #201a14 0%, #121314 100%);
    --bg-surface:        #171717;
    --bg-surface-hover:  rgba(255, 255, 255, 0.06);
    --bg-surface-active: rgba(255, 255, 255, 0.10);
    --bg-glass:          rgba(20, 19, 17, 0.86);

    --text-primary:   rgba(255, 255, 255, 0.94);
    --text-secondary: rgba(255, 255, 255, 0.72);
    --text-disabled:  rgba(255, 255, 255, 0.46);

    --accent:       #69a8ff;
    --accent-hover: #9bc7ff;
    --accent-muted: rgba(105, 168, 255, 0.16);

    --positive:       #62d6a7;
    --positive-muted: rgba(98, 214, 167, 0.16);
    --negative:       #ff6b75;
    --warning:        #f2b35d;
    --warning-muted:  rgba(242, 179, 93, 0.16);

    --border-subtle: rgba(255, 255, 255, 0.10);
    --border-normal: rgba(255, 255, 255, 0.16);
    --border-hover:  rgba(255, 255, 255, 0.24);
    --border-focus:  var(--accent);

    --elevation-1: 0 1px 3px rgba(0,0,0,0.35), 0 1px 2px rgba(0,0,0,0.28);
    --elevation-2: 0 8px 22px rgba(0,0,0,0.34);
    --elevation-3: 0 16px 36px rgba(0,0,0,0.42);

    --color-bg-error-subtle: rgba(255, 107, 117, 0.12);
}

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

html {
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
body {
    min-height: 100vh;
    background: var(--bg-gradient);
    background-attachment: fixed;
}
a { color: inherit; text-decoration: none; }

/* ---- Layout ---- */
.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 var(--sp-7);
}
.container-narrow {
    max-width: 920px;
    margin: 0 auto;
    padding: 0 var(--sp-7);
}

/* ---- Page header ---- */
.page-header {
    padding: var(--sp-10) 0 var(--sp-7);
}
.page-title {
    font-family: var(--font-serif);
    font-size: clamp(var(--text-3xl), 5vw, var(--text-4xl));
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -1px;
}
.page-title em {
    font-style: italic;
    font-weight: 700;
}
.page-desc {
    margin-top: var(--sp-3);
    font-size: var(--text-md);
    color: var(--text-secondary);
    max-width: 680px;
    line-height: 1.55;
}
.page-kicker {
    display: inline-block;
    margin-bottom: var(--sp-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 600;
    color: var(--accent);
    letter-spacing: 0.4px;
    text-transform: uppercase;
}

/* ---- Section ---- */
.section {
    margin-bottom: var(--sp-10);
}
.section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    padding-bottom: var(--sp-4);
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: var(--sp-6);
}
.section-title {
    font-family: var(--font-serif);
    font-size: var(--text-xl);
    font-weight: 500;
    letter-spacing: -0.2px;
}
.section-meta {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-disabled);
    text-transform: uppercase;
    letter-spacing: 0.4px;
}

/* ---- Grid + Card ---- */
.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-4);
}
@media (max-width: 1060px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .grid { grid-template-columns: 1fr; } }

.card {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: var(--sp-5);
    min-height: 168px;
    box-shadow: var(--elevation-1);
    transition: border-color var(--dur-norm) var(--ease),
                box-shadow var(--dur-norm) var(--ease),
                transform var(--dur-norm) var(--ease);
}
.card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}
.card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--sp-3);
}
.card-title {
    display: flex;
    align-items: center;
    gap: var(--sp-3);
    min-width: 0;
    flex: 1;
}
.card-icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    background: var(--accent-muted);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background var(--dur-norm) var(--ease);
}
.card:hover .card-icon {
    background: rgba(17, 112, 207, 0.15);
}
[data-theme="dark"] .card:hover .card-icon {
    background: rgba(105, 168, 255, 0.22);
}
.card-icon-mask {
    width: 20px;
    height: 20px;
    background: currentColor;
    mask-repeat: no-repeat;
    mask-position: center;
    mask-size: contain;
    -webkit-mask-repeat: no-repeat;
    -webkit-mask-position: center;
    -webkit-mask-size: contain;
}
.card-name {
    font-family: var(--font-serif);
    font-size: var(--text-lg);
    font-weight: 500;
    line-height: 1.25;
    letter-spacing: -0.2px;
}
.card-badge {
    flex-shrink: 0;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    padding: 2px var(--sp-2);
    border-radius: var(--radius-xs);
    background: var(--accent-muted);
    color: var(--accent);
    line-height: 1.5;
}
.card-desc {
    font-size: var(--text-sm);
    color: var(--text-secondary);
    line-height: 1.5;
    flex: 1;
}
.card-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: var(--sp-3);
    border-top: 1px solid var(--border-subtle);
    margin-top: auto;
}
.card-link {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--accent);
    transition: color var(--dur-fast);
}
.card-link:hover { color: var(--accent-hover); }
.card-link .arrow {
    display: inline-block;
    font-size: 12px;
    transition: transform var(--dur-fast) var(--ease);
}
.card-link:hover .arrow { transform: translateX(3px); }

/* ---- Button ---- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--sp-2);
    padding: var(--sp-2) var(--sp-4);
    border: 1px solid var(--border-normal);
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--dur-fast), border-color var(--dur-fast);
    text-decoration: none;
}
.btn:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-hover);
}
.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #fff;
}
.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}
.btn-block {
    width: 100%;
}

/* ---- Form controls ---- */
.form-field {
    display: flex;
    flex-direction: column;
    gap: var(--sp-2);
    margin-bottom: var(--sp-4);
}
.form-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--text-primary);
}
.form-input {
    display: block;
    width: 100%;
    padding: var(--sp-3);
    border: 1px solid var(--border-normal);
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.4;
    transition: border-color var(--dur-fast), box-shadow var(--dur-fast);
}
.form-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(17, 112, 207, 0.15);
}

/* ---- Alert ---- */
.alert {
    padding: var(--sp-3) var(--sp-4);
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    margin-bottom: var(--sp-4);
}
.alert-error {
    background: rgba(219, 31, 46, 0.08);
    border: 1px solid rgba(219, 31, 46, 0.25);
    color: var(--negative);
}
[data-theme="dark"] .alert-error {
    background: rgba(255, 107, 117, 0.12);
    border-color: rgba(255, 107, 117, 0.28);
}

/* ---- Footer ---- */
.footer {
    padding: var(--sp-10) 0 var(--sp-8);
    text-align: center;
    color: var(--text-disabled);
    font-size: var(--text-sm);
}
.footer-brand {
    font-family: var(--font-serif);
    font-style: italic;
    color: var(--text-secondary);
}

/* ---- Prose (markdown-rendered doc pages) ---- */
.prose {
    max-width: 740px;
    color: var(--text-primary);
    font-size: var(--text-md);
    line-height: 1.65;
}
.prose h1, .prose h2, .prose h3, .prose h4 {
    font-family: var(--font-serif);
    font-weight: 500;
    letter-spacing: -0.2px;
    margin-top: var(--sp-7);
    margin-bottom: var(--sp-3);
    line-height: 1.2;
}
.prose h1 { font-size: var(--text-3xl); font-weight: 300; letter-spacing: -1px; }
.prose h2 { font-size: var(--text-2xl); padding-top: var(--sp-6); border-top: 1px solid var(--border-subtle); }
.prose h3 { font-size: var(--text-xl); }
.prose h4 { font-size: var(--text-lg); }
.prose p, .prose ul, .prose ol {
    margin-bottom: var(--sp-4);
}
.prose ul, .prose ol {
    padding-left: var(--sp-6);
}
.prose li {
    margin-bottom: var(--sp-2);
}
.prose a {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-color: rgba(17, 112, 207, 0.3);
    text-underline-offset: 2px;
}
.prose a:hover {
    text-decoration-color: var(--accent);
}
.prose code {
    font-family: var(--font-mono);
    font-size: 0.92em;
    padding: 1px 6px;
    border-radius: var(--radius-xs);
    background: rgba(0, 0, 0, 0.06);
    color: var(--accent-hover);
}
[data-theme="dark"] .prose code {
    background: rgba(255, 255, 255, 0.08);
}
.prose pre {
    background: #0f1420;
    color: #f2f3f5;
    border-radius: var(--radius-md);
    padding: var(--sp-4);
    overflow-x: auto;
    margin: var(--sp-4) 0;
    font-family: var(--font-mono);
    font-size: var(--text-sm);
    line-height: 1.55;
    position: relative;
}
[data-theme="dark"] .prose pre {
    border: 1px solid var(--border-subtle);
}
.prose pre code {
    background: none;
    color: inherit;
    padding: 0;
    border-radius: 0;
    font-size: inherit;
}
.prose blockquote {
    padding: var(--sp-3) var(--sp-5);
    border-left: 3px solid var(--accent);
    background: var(--accent-muted);
    color: var(--text-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: var(--sp-4) 0;
}
.prose table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--sp-5) 0;
    font-size: var(--text-sm);
}
.prose th, .prose td {
    text-align: left;
    padding: var(--sp-2) var(--sp-3);
    border-bottom: 1px solid var(--border-subtle);
}
.prose th {
    font-weight: 600;
    background: var(--bg-secondary);
    border-bottom-color: var(--border-normal);
}

/* ---- Tabs ---- */
.tabs {
    display: flex;
    gap: 0;
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: var(--sp-4);
}
.tab {
    padding: var(--sp-3) var(--sp-4);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.4px;
    cursor: pointer;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    transition: color var(--dur-fast), border-color var(--dur-fast);
}
.tab:hover {
    color: var(--text-primary);
}
.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* ---- Architecture hero (home + /ocpp/architecture/) ---- */
.arch-hero {
    margin: 0 0 var(--sp-9);
    padding: var(--sp-7);
    background: var(--bg-gradient-sub);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
}
.arch-hero-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: var(--sp-5);
    margin-bottom: var(--sp-6);
    flex-wrap: wrap;
}
.arch-hero-title {
    font-family: var(--font-serif);
    font-size: var(--text-2xl);
    font-weight: 400;
    line-height: 1.15;
    letter-spacing: -0.5px;
    margin-top: var(--sp-2);
}
.arch-hero-desc {
    margin-top: var(--sp-2);
    color: var(--text-secondary);
    max-width: 640px;
    font-size: var(--text-md);
    line-height: 1.55;
}
.arch-hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--sp-2);
    padding: var(--sp-3) var(--sp-5);
    background: var(--accent);
    color: #fff;
    font-weight: 600;
    font-size: var(--text-sm);
    text-decoration: none;
    border-radius: 8px;
    transition: background var(--dur-fast), transform var(--dur-fast);
    white-space: nowrap;
}
.arch-hero-cta:hover {
    background: var(--accent-hover);
}
.arch-hero-cta .arrow {
    transition: transform var(--dur-fast);
}
.arch-hero-cta:hover .arrow {
    transform: translateX(3px);
}
.arch-hero-figure {
    background: var(--bg-solid);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: var(--sp-4);
}
.arch-diagram {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
    color: var(--accent);   /* drives the marker-end arrows via currentColor */
}
.arch-node rect {
    transition: stroke var(--dur-fast), fill var(--dur-fast);
}
.arch-node:hover rect {
    stroke: var(--accent);
}
.arch-highlight rect {
    fill: var(--accent-muted);
}

/* ---- Responsive ---- */
@media (max-width: 780px) {
    .container, .container-narrow { padding: 0 var(--sp-4); }
    .page-header { padding: var(--sp-8) 0 var(--sp-6); }
    .page-title { font-size: var(--text-2xl); }
    .arch-hero { padding: var(--sp-5); }
    .arch-hero-head { flex-direction: column; align-items: flex-start; }
    .arch-hero-cta { align-self: stretch; justify-content: center; }
}