:root {
    --bg: #ffffff;
    --p: #ffffff;
    --p2: #f8fafc;
    --t: #0f172a;
    --m: #475569;
    --l: #e2e8f0;
    --a: #0284c7;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: radial-gradient(circle at 85% 0, rgba(2, 132, 199, 0.05), transparent 40%), var(--bg);
    color: var(--t);
    font: 15px/1.7 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

a {
    color: var(--a);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: #0369a1;
}

.wrap {
    max-width: 1180px;
    margin: auto;
    padding: 0 24px;
}

nav {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--l);
    z-index: 100;
}

.navin {
    min-height: 62px;
    display: flex;
    align-items: center;
}

.brand {
    font-weight: 800;
    color: #0f172a;
    margin-right: auto;
    font-size: 15px;
    text-decoration: none;
}

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

.navlinks {
    display: flex;
    gap: 16px;
    font-size: 13px;
}

.navlinks a {
    color: #475569;
    font-weight: 500;
    padding: 5px 10px;
    border-radius: 6px;
    transition: all 0.15s ease;
    text-decoration: none;
}

.navlinks a:hover,
.navlinks a.active {
    color: var(--a);
    background: #f0f9ff;
    font-weight: 600;
}

main {
    padding: 0px 0 90px;
}

.eyebrow {
    color: var(--a);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .14em;
    text-transform: uppercase;
}

h1 {
    font-size: clamp(34px, 5vw, 56px);
    line-height: 1.15;
    letter-spacing: -.035em;
    color: #0f172a;
    margin: 14px 0 20px;
    font-weight: 800;
}

h2 {
    font-size: 26px;
    letter-spacing: -.03em;
    color: #0f172a;
    margin: 44px 0 14px;
    font-weight: 700;
}

.lead {
    max-width: 800px;
    color: var(--m);
    font-size: 17px;
    line-height: 1.6;
}

.badge,
.node {
    display: inline-block;
    border: 1px solid #bae6fd;
    border-radius: 999px;
    padding: 6px 13px;
    background: #f0f9ff;
    color: #0284c7;
    font-size: 12px;
    font-weight: 600;
}

.flow {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    margin: 25px 0;
}

.node {
    border-radius: 14px;
    padding: 12px 18px;
    font-size: 14px;
    font-weight: 700;
    background: #ffffff;
    border: 1px solid var(--l);
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
}

.arrow {
    color: var(--a);
}

.grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.grid2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.card {
    background: #ffffff;
    border: 1px solid var(--l);
    border-radius: 16px;
    padding: 22px;
    box-shadow: 0 2px 8px rgba(15, 23, 42, 0.04);
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
    border-color: #cbd5e1;
}

.card h3 {
    color: #0f172a;
    font-weight: 700;
}

.card p {
    color: var(--m);
}

.num {
    color: var(--a);
    font-size: 11px;
    font-weight: 800;
    letter-spacing: .1em;
}

.code,
.tree {
    background: #0f172a;
    color: #e2e8f0;
    border: 1px solid #1e293b;
    border-radius: 14px;
    padding: 18px;
    overflow: auto;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
}

.code pre {
    margin: 0;
    white-space: pre;
    color: #e2e8f0;
}

code,
pre {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    font-size: 13px;
}

.callout {
    border-left: 4px solid var(--a);
    padding: 14px 18px;
    background: #f0f9ff;
    color: #0c4a6e;
    border: 1px solid #bae6fd;
    border-left: 4px solid var(--a);
    border-radius: 8px;
    line-height: 1.6;
}

.callout strong {
    color: #0369a1;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: #ffffff;
    margin: 14px 0;
    border: 1px solid var(--l);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.03);
}

th,
td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--l);
    vertical-align: top;
}

th {
    font-size: 12px;
    color: #475569;
    background: #f8fafc;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 0.05em;
}

td {
    color: #334155;
}

.piece {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    margin: 22px 0;
}

.ui {
    background: #ffffff;
    color: #0f172a;
    border: 1px solid var(--l);
    border-radius: 14px;
    padding: 20px;
    box-shadow: 0 2px 6px rgba(15, 23, 42, 0.04);
}

.mini {
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 14px;
    background: #f8fafc;
}

.mini button {
    border: 0;
    border-radius: 8px;
    padding: 8px 14px;
    background: #0284c7;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s ease;
}

.mini button:hover {
    background: #0369a1;
}

@media(max-width:800px) {
    .grid,
    .grid2,
    .piece {
        grid-template-columns: 1fr;
    }

    .navlinks {
        display: none;
    }
}

footer {
    border-top: 1px solid var(--l);
    padding: 28px 0;
    color: var(--m);
    font-size: 13px;
    background: #ffffff;
}

footer a {
    color: var(--m);
    text-decoration: none;
    transition: color 0.15s ease;
}

footer a:hover {
    color: var(--a);
}

.copy-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    border: 1px solid #334155;
    background: #1e293b;
    color: #e2e8f0;
    border-radius: 6px;
    padding: 5px 11px;
    font: 12px system-ui, sans-serif;
    cursor: pointer;
    transition: all 0.15s ease;
}

.copy-btn:hover {
    background: #334155;
    color: #ffffff;
}

.grid3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

@media(max-width:1050px) {
    .grid3 {
        grid-template-columns: 1fr;
    }
}

/* Spec Header & Actions */
.spec-header-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 36px 0 14px;
    flex-wrap: wrap;
    gap: 12px;
}

.spec-header-row h2 {
    margin: 0;
}

.spec-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

/* Button Spec Action for all step files */
.btn-spec-action {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: #ffffff;
    color: #0284c7;
    border: 1px solid #bae6fd;
    border-radius: 8px;
    padding: 7px 14px;
    font-size: 13px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.18s ease;
    font-family: inherit;
    user-select: none;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.btn-spec-action:hover {
    background: #f0f9ff;
    border-color: #0284c7;
    color: #0369a1;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.15);
}

.btn-spec-action:active {
    transform: translateY(0);
}

.btn-spec-action.btn-download {
    background: linear-gradient(135deg, #0284c7, #0369a1);
    border-color: #0284c7;
    color: #ffffff;
    box-shadow: 0 2px 8px rgba(2, 132, 199, 0.25);
}

.btn-spec-action.btn-download:hover {
    background: linear-gradient(135deg, #0369a1, #075985);
    box-shadow: 0 4px 14px rgba(2, 132, 199, 0.35);
}