/* ═══════════════════════════════════════════
   WBSKT · Shared Design System
   ═══════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=DM+Mono:ital,wght@0,300;0,400;0,500;1,300&family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,600;1,9..144,300&display=swap');

/* ── Tokens ── */
:root {
    --bg:          #0c0f0a;
    --bg2:         #131710;
    --bg3:         #1a1f16;
    --bg4:         #222820;
    --border:      #2a3226;
    --border2:     #354030;
    --text:        #d8e4d0;
    --text2:       #8fa888;
    --text3:       #556650;
    --accent:      #7ec96a;
    --accent2:     #4a8c3a;
    --accent-dim:  #2a4a22;
    --amber:       #d4a843;
    --amber-dim:   #3a2e10;
    --coral:       #d46e5a;
    --coral-dim:   #3a1e16;
    --blue:        #5a9fd4;
    --blue-dim:    #162030;
    --purple:      #9a7ed4;
    --purple-dim:  #221a38;
    --r:           6px;

    /* Layout */
    --sidebar-w:   240px;
}

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

/* ── Base ── */
body {
    background: var(--bg);
    color: var(--text);
    font-family: 'DM Mono', monospace;
    font-size: 13px;
    line-height: 1.7;
    min-height: 100vh;
}

.skip-link {
    position: absolute;
    left: 12px;
    top: -40px;
    z-index: 1000;
    padding: 8px 12px;
    border-radius: var(--r);
    border: 1px solid var(--accent2);
    background: var(--bg2);
    color: var(--accent);
    text-decoration: none;
    font-size: 11px;
    letter-spacing: 0.04em;
}

.skip-link:focus {
    top: 12px;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image:
        linear-gradient(var(--border) 1px, transparent 1px),
        linear-gradient(90deg, var(--border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.15;
    pointer-events: none;
    z-index: 0;
}

/* ── Layout shell (sidebar + content) ── */
.layout {
    display: flex;
    min-height: 100vh;
    position: relative;
    z-index: 1;
}

/* ── Sidebar ── */
.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    background: var(--bg2);
    border-right: 1px solid var(--border2);
    padding: 32px 0 40px;
    scrollbar-width: thin;
    scrollbar-color: var(--border2) transparent;
}

.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

.sidebar-logo {
    font-family: 'Fraunces', serif;
    font-size: 14px;
    letter-spacing: 0.3em;
    color: var(--text3);
    text-transform: uppercase;
    text-decoration: none;
    padding: 0 24px 24px;
    display: block;
    border-bottom: 1px solid var(--border);
    transition: color 0.2s;
}
.sidebar-logo:hover { color: var(--accent); }

.sidebar-section {
    padding: 20px 24px 8px;
    font-size: 9px;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--text3);
}

.sidebar-section:first-of-type { padding-top: 24px; }

.sidebar-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 7px 24px;
    font-size: 12px;
    color: var(--text2);
    text-decoration: none;
    transition: color 0.15s, background 0.15s;
    border-left: 2px solid transparent;
    position: relative;
}

.sidebar-link:hover {
    color: var(--text);
    background: var(--bg3);
}

.sidebar-link.active {
    color: var(--accent);
    border-left-color: var(--accent);
    background: var(--accent-dim);
}

/* Coming Soon link style */
.sidebar-link.coming-soon {
    color: var(--text3);
    cursor: default;
}
.sidebar-link.coming-soon:hover {
    background: transparent;
    color: var(--text3);
}

/* Coming Soon badge + tooltip */
.cs-badge {
    font-size: 8px;
    padding: 1px 5px;
    border-radius: 99px;
    background: var(--bg4);
    border: 1px solid var(--border2);
    color: var(--text3);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    white-space: nowrap;
}

.cs-tooltip-wrap {
    position: relative;
    display: flex;
    align-items: center;
    gap: 6px;
}

.cs-tooltip-wrap .tooltip {
    display: none;
    position: absolute;
    right: -8px;
    top: 50%;
    transform: translate(100%, -50%);
    background: var(--bg4);
    border: 1px solid var(--border2);
    border-radius: var(--r);
    padding: 6px 10px;
    font-size: 10px;
    color: var(--text2);
    white-space: nowrap;
    z-index: 100;
    pointer-events: none;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.sidebar-link.coming-soon:hover .cs-tooltip-wrap .tooltip { display: block; }

/* ── Main content area ── */
.content {
    flex: 1;
    min-width: 0;
    padding: 60px 60px 100px;
    max-width: 860px;
}

a:focus-visible,
button:focus-visible,
.sidebar-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* On landing page — no sidebar, full bleed */
.content.full { max-width: 100%; padding: 0; }

/* ── Page header ── */
.header {
    margin-bottom: 56px;
    border-bottom: 1px solid var(--border2);
    padding-bottom: 36px;
}

.breadcrumb {
    font-size: 11px;
    color: var(--text3);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 20px;
}
.breadcrumb a { color: var(--text3); text-decoration: none; transition: color 0.15s; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { color: var(--text2); }

h1 {
    font-family: 'Fraunces', serif;
    font-size: 48px;
    font-weight: 300;
    line-height: 1.1;
    color: var(--accent);
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}
h1 em { font-style: italic; color: var(--text); }

.tagline {
    color: var(--text2);
    font-size: 13px;
    max-width: 520px;
    line-height: 1.8;
    margin-top: 14px;
}

.version-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
    flex-wrap: wrap;
}

/* ── Badges ── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 10px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    padding: 4px 10px;
    border-radius: 99px;
    font-weight: 500;
    white-space: nowrap;
}
.badge-v1     { background: var(--accent-dim);  color: var(--accent);  border: 1px solid var(--accent2); }
.badge-core   { background: var(--blue-dim);    color: var(--blue);    border: 1px solid #1a3a54; }
.badge-http   { background: var(--blue-dim);    color: var(--blue);    border: 1px solid #1a3a54; }
.badge-sec    { background: var(--purple-dim);  color: var(--purple);  border: 1px solid #3a2860; }
.badge-seq    { background: var(--blue-dim);    color: var(--blue);    border: 1px solid #1a3a54; }
.badge-iot    { background: var(--purple-dim);  color: var(--purple);  border: 1px solid #3a2860; }
.badge-todo   { background: var(--amber-dim);   color: var(--amber);   border: 1px solid #5a4010; }

/* ── Section titles ── */
h2 {
    font-family: 'Fraunces', serif;
    font-size: 22px;
    font-weight: 300;
    color: var(--text);
    margin: 52px 0 20px;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    gap: 12px;
}
h2::before {
    content: '';
    display: block;
    width: 4px;
    height: 22px;
    background: var(--accent);
    border-radius: 2px;
    flex-shrink: 0;
}

h3 {
    font-size: 11px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--text3);
    font-weight: 400;
    margin: 28px 0 12px;
}

p { color: var(--text2); line-height: 1.8; margin-bottom: 12px; }
p:last-child { margin-bottom: 0; }

.section-intro {
    color: var(--text2);
    font-size: 13px;
    margin-bottom: 20px;
    max-width: 580px;
    line-height: 1.8;
}

code {
    font-family: 'DM Mono', monospace;
    background: var(--bg4);
    border: 1px solid var(--border);
    padding: 1px 6px;
    border-radius: 3px;
    font-size: 11px;
    color: var(--accent);
}

hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }

/* ── Node card ── */
.node-card {
    background: var(--bg2);
    border: 1px solid var(--border2);
    border-radius: var(--r);
    overflow: hidden;
    margin-bottom: 40px;
}

.node-header {
    padding: 18px 24px;
    background: var(--bg3);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 10px;
}

.node-name {
    font-family: 'DM Mono', monospace;
    font-size: 15px;
    font-weight: 500;
    color: var(--accent);
    letter-spacing: 0.02em;
}

.node-desc {
    color: var(--text2);
    font-size: 12px;
    padding: 14px 24px 18px;
    border-bottom: 1px solid var(--border);
    line-height: 1.8;
}

.node-body {
    padding: 24px;
    overflow-x: auto;
}

/* ── Property table ── */
.prop-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
    margin-bottom: 8px;
    min-width: 620px;
}
.prop-table th {
    text-align: left;
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text3);
    padding: 0 12px 10px 0;
    font-weight: 400;
    border-bottom: 1px solid var(--border);
}
.prop-table td {
    padding: 10px 12px 10px 0;
    vertical-align: top;
    border-bottom: 1px solid var(--border);
    color: var(--text2);
    line-height: 1.7;
}
.prop-table tr:last-child td { border-bottom: none; }
.prop-name    { font-family: 'DM Mono', monospace; color: var(--accent); font-size: 12px; white-space: nowrap; }
.prop-type    { color: var(--blue); font-size: 11px; white-space: nowrap; }
.prop-default { color: var(--amber); font-size: 11px; white-space: nowrap; }
.prop-note    { font-size: 11px; color: var(--text3); margin-top: 4px; font-style: italic; }

/* ── Port diagram ── */
.port-diagram {
    display: flex;
    align-items: stretch;
    gap: 0;
    margin: 0 0 32px;
    border: 1px solid var(--border2);
    border-radius: var(--r);
    overflow: hidden;
    background: var(--bg2);
    min-height: 120px;
}

.port-diagram-col {
    flex: 1;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.port-diagram-col.inputs  { border-right: 1px solid var(--border); }

.port-diagram-col-label {
    font-size: 9px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 4px;
}

.port-diagram-center {
    width: 120px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px 10px;
    background: var(--bg3);
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
    gap: 6px;
}

.port-diagram-node-name {
    font-family: 'DM Mono', monospace;
    font-size: 10px;
    font-weight: 500;
    color: var(--accent);
    text-align: center;
    letter-spacing: 0.03em;
    word-break: break-all;
}

.port-diagram-node-type {
    font-size: 9px;
    color: var(--text3);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.port-pin {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-family: 'DM Mono', monospace;
    color: var(--text2);
}

.port-pin.output { flex-direction: row-reverse; }

.port-pin-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
    border: 1px solid;
}

.pin-signal  { background: var(--blue-dim);   border-color: var(--blue);   }
.pin-data    { background: var(--purple-dim);  border-color: var(--purple); }
.pin-both    { background: var(--accent-dim);  border-color: var(--accent); }
.pin-control { background: var(--amber-dim);   border-color: var(--amber);  }
.pin-error   { background: var(--coral-dim);   border-color: var(--coral);  }

.port-pin-line {
    flex: 1;
    height: 1px;
    background: var(--border2);
}

/* ── Port rows (detail section) ── */
.port-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 8px;
}

.port-col-label {
    font-size: 10px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.port-col-label::after { content: ''; flex: 1; height: 1px; background: var(--border); }

.port-row {
    padding: 10px 14px;
    border-radius: var(--r);
    border: 1px solid var(--border);
    background: var(--bg3);
    margin-bottom: 8px;
}
.port-row:last-child { margin-bottom: 0; }

.port-name {
    font-family: 'DM Mono', monospace;
    font-size: 12px;
    margin-bottom: 3px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.port-pill {
    font-size: 9px;
    padding: 2px 7px;
    border-radius: 99px;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    font-weight: 500;
}
.pill-signal  { background: var(--blue-dim);   color: var(--blue);   border: 1px solid #1a3a54; }
.pill-data    { background: var(--purple-dim);  color: var(--purple); border: 1px solid #3a2860; }
.pill-both    { background: var(--accent-dim);  color: var(--accent); border: 1px solid var(--accent2); }
.pill-control { background: var(--amber-dim);   color: var(--amber);  border: 1px solid #5a4010; }
.pill-error   { background: var(--coral-dim);   color: var(--coral);  border: 1px solid #5a2018; }

.port-desc { font-size: 11px; color: var(--text3); line-height: 1.6; }

.port-payload {
    font-family: 'DM Mono', monospace;
    font-size: 10px;
    color: var(--text2);
    background: var(--bg4);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 6px 10px;
    margin-top: 6px;
    line-height: 1.8;
}

/* ── Callouts ── */
.callout {
    border-radius: var(--r);
    padding: 14px 18px;
    font-size: 12px;
    line-height: 1.8;
    margin: 16px 0;
    border-left: 3px solid;
}
.callout-info  { background: var(--blue-dim);   border-color: var(--blue);   color: var(--blue); }
.callout-warn  { background: var(--amber-dim);  border-color: var(--amber);  color: #c09830; }
.callout-good  { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }
.callout-error { background: var(--coral-dim);  border-color: var(--coral);  color: var(--coral); }
.callout strong { font-weight: 500; display: block; margin-bottom: 4px; }

/* ── Priority rows ── */
.priority-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 14px;
    border-radius: 4px;
    margin-bottom: 6px;
    background: var(--bg3);
    border: 1px solid var(--border);
    font-size: 12px;
}
.priority-num {
    font-size: 10px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-weight: 500;
}
.p1 { background: var(--coral-dim);  color: var(--coral);  border: 1px solid #5a2018; }
.p2 { background: var(--amber-dim);  color: var(--amber);  border: 1px solid #5a4010; }
.p3 { background: var(--blue-dim);   color: var(--blue);   border: 1px solid #1a3a54; }
.priority-label { color: var(--accent); font-family: 'DM Mono', monospace; }
.priority-desc  { color: var(--text3); font-size: 11px; }

/* ── State grid ── */
.state-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.state-item { background: var(--bg3); border: 1px solid var(--border); border-radius: 4px; padding: 10px 14px; }
.state-key  { font-family: 'DM Mono', monospace; color: var(--accent); font-size: 12px; }
.state-type { color: var(--blue); font-size: 11px; margin-left: 6px; }
.state-about{ color: var(--text3); font-size: 11px; margin-top: 3px; line-height: 1.5; }

/* ── Concurrency diagram ── */
.concur-row  { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 16px; }
.concur-card { border: 1px solid var(--border2); border-radius: var(--r); overflow: hidden; }
.concur-head { padding: 10px 14px; font-size: 11px; font-weight: 500; letter-spacing: 0.05em; display: flex; align-items: center; gap: 8px; }
.concur-head.seq  { background: var(--blue-dim);   color: var(--blue);   border-bottom: 1px solid #1a3a54; }
.concur-head.conc { background: var(--purple-dim);  color: var(--purple); border-bottom: 1px solid #3a2860; }
.concur-body { padding: 14px; background: var(--bg3); font-size: 11px; color: var(--text2); line-height: 1.8; }
.timeline { display: flex; gap: 4px; align-items: center; margin: 10px 0 4px; flex-wrap: wrap; }
.tick { width: 28px; height: 20px; border-radius: 3px; display: flex; align-items: center; justify-content: center; font-size: 9px; font-weight: 500; flex-shrink: 0; }
.tick-active { background: var(--blue-dim);   color: var(--blue);   border: 1px solid #1a3a54; }
.tick-wait   { background: var(--bg4);        color: var(--text3);  border: 1px solid var(--border); }
.tick-all    { background: var(--purple-dim); color: var(--purple); border: 1px solid #3a2860; }
.tick-label  { font-size: 10px; color: var(--text3); margin-left: 4px; }

/* ── Todo list ── */
.todo-list { list-style: none; padding: 0; }
.todo-list li {
    padding: 10px 14px;
    border-left: 2px solid var(--amber);
    background: var(--amber-dim);
    border-radius: 0 4px 4px 0;
    font-size: 12px;
    color: #c09830;
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
}
.todo-list li::before { content: '○'; flex-shrink: 0; margin-top: 1px; }

/* ── Page footer ── */
.page-footer {
    margin-top: 80px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--text3);
}
.footer-brand { font-family: 'Fraunces', serif; font-size: 14px; color: var(--text2); }

/* ── Responsive ── */
@media (max-width: 1100px) {
    .content {
        padding: 48px 36px 80px;
        max-width: 100%;
    }
}

@media (max-width: 900px) {
    .layout {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        position: relative;
        height: auto;
        max-height: 44vh;
        border-right: none;
        border-bottom: 1px solid var(--border2);
        padding: 20px 0 24px;
    }

    .content {
        padding: 36px 20px 64px;
    }

    .port-grid,
    .state-grid,
    .concur-row {
        grid-template-columns: 1fr;
    }

    .port-diagram {
        flex-direction: column;
    }

    .port-diagram-col.inputs {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .port-diagram-center {
        width: 100%;
        border-left: none;
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .page-footer {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
}

@media (max-width: 600px) {
    h1 { font-size: 34px; }
    h2 { font-size: 19px; margin: 40px 0 14px; }
    .tagline { font-size: 12px; }
    .header { margin-bottom: 40px; padding-bottom: 28px; }
    .node-body { padding: 18px; }
    .prop-table { min-width: 560px; }
}

/* ── Animation ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}
.content > * { animation: fadeUp 0.4s ease both; }
.content > *:nth-child(1) { animation-delay: .04s; }
.content > *:nth-child(2) { animation-delay: .08s; }
.content > *:nth-child(3) { animation-delay: .12s; }
.content > *:nth-child(4) { animation-delay: .16s; }
.content > *:nth-child(5) { animation-delay: .20s; }

@media (prefers-reduced-motion: reduce) {
    .content > * {
        animation: none !important;
    }
}