/* Shared styles for the architecture pages (public /how-it-works/ and /admin/architecture/).
   Palette and type match the homepage. */
:root {
  --night: #14163a; --night-2: #1d2050; --night-3: #262a63; --line: #34387a;
  --paper: #edebf7; --muted: #b3b1d0; --trace: #9fe3d0; --rem: #f2a7c3; --warn: #f5c26b; --bad: #f28b8b;
  --serif: "Spectral", Georgia, serif; --sans: "Figtree", system-ui, -apple-system, "Segoe UI", sans-serif;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--night); color: var(--paper); font-family: var(--sans); font-size: 1rem; line-height: 1.55; }
a { color: var(--trace); }
:focus-visible { outline: 2px solid var(--trace); outline-offset: 3px; }
.wrap { width: min(1180px, 100% - 32px); margin: 0 auto; }
.top { display: flex; justify-content: space-between; align-items: center; padding: 20px 0; gap: 12px; flex-wrap: wrap; }
.brand { font-family: var(--serif); font-size: 1.4rem; font-weight: 600; color: var(--paper); text-decoration: none; }
.badge { font-size: .78rem; padding: 2px 10px; border-radius: 999px; box-shadow: inset 0 0 0 1px var(--line); color: var(--muted); }
.badge.admin { color: var(--night); background: var(--rem); box-shadow: none; }
h1 { font-family: var(--serif); font-weight: 300; font-size: clamp(2.1rem, 5vw, 3.6rem); line-height: 1.05; margin: 18px 0 10px; }
.lede { color: var(--muted); max-width: 64ch; margin: 0 0 26px; font-size: 1.08rem; }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; border-bottom: 1px solid var(--line); margin-bottom: 26px; position: sticky; top: 0; background: var(--night); z-index: 5; padding-top: 8px; }
.tabs button { font: 500 .95rem var(--sans); color: var(--muted); background: none; border: 0; padding: 10px 14px; cursor: pointer; border-bottom: 2px solid transparent; }
.tabs button[aria-selected="true"] { color: var(--paper); border-bottom-color: var(--trace); }
.panel { display: none; } .panel.on { display: block; animation: fade .25s ease-out; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
h2 { font-family: var(--serif); font-weight: 400; font-size: 1.7rem; margin: 0 0 6px; }
.sub { color: var(--muted); margin: 0 0 20px; max-width: 70ch; }
.grid2 { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 22px; align-items: start; }
.card { background: var(--night-2); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.detail { position: sticky; top: 70px; }
.detail h3 { font-family: var(--serif); font-weight: 600; font-size: 1.25rem; margin: 0 0 4px; }
.detail .k { font-size: .76rem; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin: 14px 0 4px; }
.detail p { margin: 0; color: var(--paper); }
.detail ul { margin: 4px 0 0; padding-left: 18px; color: var(--paper); }
.chip { display: inline-block; font-size: .78rem; padding: 2px 9px; border-radius: 999px; margin: 2px 4px 2px 0; box-shadow: inset 0 0 0 1px var(--line); color: var(--muted); }
.chip.public { color: var(--trace); box-shadow: inset 0 0 0 1px #4f8f80; }
.chip.personal { color: var(--warn); box-shadow: inset 0 0 0 1px #8f7440; }
.chip.secret { color: var(--rem); box-shadow: inset 0 0 0 1px #8f5068; }
.chip.bad { color: var(--bad); box-shadow: inset 0 0 0 1px #8f4a4a; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88em; }
/* On-screen wireframe */
.frame { border: 1px solid var(--line); border-radius: 12px; overflow: hidden; background: #0f1130; }
.frame .bar { display: flex; gap: 6px; align-items: center; padding: 8px 12px; background: var(--night-2); border-bottom: 1px solid var(--line); font-size: .8rem; color: var(--muted); }
.frame .bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--line); display: inline-block; }
.frame .url { margin-left: 10px; padding: 2px 10px; border-radius: 6px; background: var(--night); flex: 1; }
.block { display: block; width: 100%; text-align: left; border: 0; border-bottom: 1px solid #23265a; background: transparent; color: var(--paper); padding: 10px 14px; cursor: pointer; font: inherit; }
.block:hover { background: #1a1d48; }
.block.on { background: var(--night-3); box-shadow: inset 3px 0 0 var(--trace); }
.block .t { font-weight: 600; font-size: .95rem; }
.block .d { color: var(--muted); font-size: .82rem; }
.block .act { float: right; font-size: .74rem; color: var(--trace); }
/* Sequence diagram */
.controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.btn { font: 600 .9rem var(--sans); padding: 8px 14px; border-radius: 8px; border: 0; cursor: pointer; background: var(--trace); color: var(--night); }
.btn.ghost { background: transparent; color: var(--paper); box-shadow: inset 0 0 0 1px var(--line); }
.btn[disabled] { opacity: .4; cursor: default; }
select { font: 500 .95rem var(--sans); background: var(--night-2); color: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.seq { overflow-x: auto; }
.seq svg { display: block; min-width: 760px; width: 100%; height: auto; }
.steps { list-style: none; margin: 14px 0 0; padding: 0; counter-reset: s; }
.steps li { counter-increment: s; padding: 8px 10px 8px 40px; position: relative; border-radius: 8px; cursor: pointer; color: var(--muted); font-size: .93rem; }
.steps li::before { content: counter(s); position: absolute; left: 10px; top: 8px; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: .75rem; box-shadow: inset 0 0 0 1px var(--line); }
.steps li.on { background: var(--night-2); color: var(--paper); }
.steps li.on::before { background: var(--trace); color: var(--night); box-shadow: none; }
.steps li.done { color: var(--paper); }
/* Code tree */
.tree { font-size: .95rem; }
.tree details { margin-left: 16px; } .tree > details { margin-left: 0; }
.tree summary { cursor: pointer; padding: 5px 6px; border-radius: 6px; list-style: none; }
.tree summary::-webkit-details-marker { display: none; }
.tree summary:hover { background: var(--night-2); }
.tree summary .p { font-family: ui-monospace, Menlo, monospace; color: var(--trace); }
.tree summary .x { color: var(--muted); font-size: .86rem; margin-left: 8px; }
.tree .leaf { padding: 4px 6px 4px 22px; } .tree .leaf .p { font-family: ui-monospace, Menlo, monospace; color: var(--paper); }
.tree .leaf .x { color: var(--muted); font-size: .86rem; margin-left: 8px; }
.tree details > summary .p::before { content: "▸ "; color: var(--muted); }
.tree details[open] > summary .p::before { content: "▾ "; }
/* Storage */
.store { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.store .card h3 { font-family: var(--serif); font-weight: 600; font-size: 1.1rem; margin: 6px 0 4px; }
.store .card p { margin: 6px 0 0; color: var(--muted); font-size: .9rem; }
.store .card .w { font-size: .82rem; color: var(--paper); }
/* Network */
.net svg { display: block; width: 100%; height: auto; min-width: 680px; }
.net { overflow-x: auto; }
.net .node { cursor: pointer; }
.net .node rect { fill: var(--night-2); stroke: var(--line); stroke-width: 1.2; transition: stroke .15s; }
.net .node:hover rect, .net .node.on rect { stroke: var(--trace); stroke-width: 2; }
.net .zone { fill: none; stroke: var(--line); stroke-dasharray: 5 5; }
/* SDLC */
.loop { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; margin: 10px 0 24px; }
.loop button { text-align: left; background: var(--night-2); border: 1px solid var(--line); border-radius: 10px; padding: 12px; color: var(--paper); font: inherit; cursor: pointer; position: relative; }
.loop button.on { border-color: var(--trace); box-shadow: 0 0 0 1px var(--trace); }
.loop .n { font-family: var(--serif); color: var(--trace); font-size: 1.3rem; line-height: 1; display: block; margin-bottom: 6px; }
.loop .t { font-weight: 600; font-size: .92rem; } .loop .d { display: block; color: var(--muted); font-size: .8rem; margin-top: 4px; }
.note { font-size: .86rem; color: var(--muted); border-left: 3px solid var(--line); padding: 6px 12px; margin: 18px 0 0; }
.foot { margin: 70px 0 40px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: .88rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
@media (max-width: 860px) { .grid2 { grid-template-columns: 1fr; } .detail { position: static; } }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .panel.on { animation: none; } }