* {
    box-sizing: border-box;
}

:root {
    --bg: #ffffff;
    --ink: #000000;
    --ink-soft: #1f1f1f;
    --line: #000000;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
    color: var(--ink);
    background: #ffffff;
    line-height: 1.6;
}

.wrapper {
    width: min(980px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1.2rem 0 3rem;
}

.topbar {
    display: flex;
    gap: 0.8rem;
    flex-wrap: wrap;
    align-items: center;
    border: 3px solid #000000;
    padding: 12px;
    margin-top: 1rem;
    box-shadow: 5px 5px 0 #000000;
}

.topbar a {
    text-decoration: none;
    color: #000000;
    border: 2px solid #000000;
    padding: 7px 10px;
    font-weight: 700;
    box-shadow: 3px 3px 0 #000000;
    font-size: 0.88rem;
}

.topbar a:hover {
    transform: translate(1px, 1px);
    box-shadow: 1px 1px 0 #000000;
}

.doc-header {
    border: 3px solid #000000;
    margin-top: 1rem;
    padding: 20px;
    box-shadow: 6px 6px 0 #000000;
}

.doc-header p {
    margin: 0 0 0.6rem;
    font-size: 0.9rem;
}

h1,
h2,
h3 {
    font-family: "Space Grotesk", "Segoe UI", sans-serif;
    text-transform: uppercase;
    letter-spacing: -0.01em;
}

h1 {
    margin: 0 0 0.7rem;
    font-size: clamp(1.7rem, 4vw, 2.7rem);
}

h2 {
    margin: 2rem 0 0.8rem;
    font-size: 1.2rem;
    border-bottom: 2px solid #000000;
    padding-bottom: 0.35rem;
}

h3 {
    margin: 1.2rem 0 0.45rem;
    font-size: 1rem;
}

p,
li {
    color: var(--ink-soft);
}

section {
    border: 2px solid #000000;
    margin-top: 1rem;
    padding: 1rem;
}

ul,
ol {
    margin: 0.3rem 0 0.9rem 1.2rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 0.7rem 0 1rem;
}

th,
td {
    border: 1px solid #000000;
    text-align: left;
    padding: 8px;
    font-size: 0.9rem;
}

th {
    background: #f4f4f4;
}

.note {
    border: 2px dashed #000000;
    padding: 0.7rem;
    background: #fafafa;
    font-size: 0.9rem;
}

.footer {
    margin-top: 1rem;
    border: 2px solid #000000;
    padding: 0.8rem;
    font-size: 0.86rem;
}

.academic-cover {
    border: 3px solid #000000;
    margin-top: 1rem;
    padding: 1.5rem 1rem 2rem;
    box-shadow: 6px 6px 0 #000000;
    text-align: center;
}

.academic-cover p {
    margin: 0.35rem 0;
}

.cover-block {
    margin: 1.2rem auto;
    max-width: 720px;
}

.cover-project {
    margin: 2rem 0 1rem;
}

.cover-members {
    list-style: none;
    margin: 1.5rem 0;
    padding: 0;
}

.cover-members li {
    padding: 0.2rem 0;
    font-weight: 600;
}

.cover-city {
    margin-top: 2rem;
    font-weight: 700;
    letter-spacing: 0.03em;
}

.summary-list {
    margin: 0.6rem 0 0;
    padding-left: 1.2rem;
}

.summary-list li {
    margin-bottom: 0.5rem;
}

.summary-list a {
    font-weight: 700;
}

.source-list,
.inline-link-list,
.check-list {
    margin: 0.6rem 0 1rem 1.2rem;
}

.source-list li,
.inline-link-list li,
.check-list li {
    margin-bottom: 0.45rem;
}

.section-lead {
    font-size: 0.94rem;
}

.meta-grid,
.benefits-grid,
.persona-grid,
.prototype-grid,
.mvp-grid,
.appendix-grid,
.model-grid,
.testing-grid,
.marketing-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.card-block,
.prototype-card,
.persona-card,
.benefit-card,
.mvp-card,
.appendix-card,
.model-card,
.testing-card,
.marketing-card {
    border: 2px solid #000000;
    padding: 1rem;
    background: #ffffff;
}

.card-block h3,
.prototype-card h3,
.persona-card h3,
.benefit-card h3,
.mvp-card h3,
.appendix-card h3,
.model-card h3,
.testing-card h3,
.marketing-card h3 {
    margin-top: 0;
}

.mini-note {
    font-size: 0.88rem;
    color: #333333;
}

.hierarchy {
    display: grid;
    gap: 1rem;
}

.hierarchy-level {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.9rem;
}

.hierarchy-node {
    border: 2px solid #000000;
    background: #fafafa;
    padding: 0.9rem;
    min-height: 100%;
}

.hierarchy-node strong {
    display: block;
    margin-bottom: 0.45rem;
    font-family: "Space Grotesk", "Segoe UI", sans-serif;
    text-transform: uppercase;
}

.hierarchy-root {
    border: 3px solid #000000;
    padding: 1rem;
    background: #ffffff;
    text-align: center;
    box-shadow: 4px 4px 0 #000000;
}

.canvas-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.8rem;
}

.canvas-card {
    border: 2px solid #000000;
    padding: 0.85rem;
    min-height: 180px;
    background: #ffffff;
}

.canvas-card h3 {
    margin-top: 0;
    margin-bottom: 0.6rem;
    font-size: 0.96rem;
}

.canvas-card ul {
    margin-bottom: 0;
}

.canvas-tall {
    grid-row: span 2;
}

.canvas-wide {
    grid-column: span 2;
}

.status-tag {
    display: inline-block;
    border: 1px solid #000000;
    padding: 0.15rem 0.4rem;
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    background: #f4f4f4;
    margin-bottom: 0.5rem;
}

.prototype-card .screen {
    border: 2px solid #000000;
    min-height: 170px;
    padding: 0.85rem;
    background:
        linear-gradient(#efefef 1px, transparent 1px),
        linear-gradient(90deg, #efefef 1px, transparent 1px),
        #ffffff;
    background-size: 16px 16px, 16px 16px, auto;
}

.prototype-card .screen-header {
    display: flex;
    justify-content: space-between;
    gap: 0.5rem;
    font-weight: 700;
    margin-bottom: 0.8rem;
    font-size: 0.82rem;
    text-transform: uppercase;
}

.prototype-card .screen ul {
    margin: 0 0 0 1rem;
    font-size: 0.88rem;
}

.link-banner {
    border: 2px solid #000000;
    padding: 0.85rem 1rem;
    background: #f9f9f9;
    margin-bottom: 1rem;
}

.split-table {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.split-table table {
    margin: 0;
}

.appendix-card ul,
.model-card ul,
.marketing-card ul,
.testing-card ul,
.mvp-card ul {
    margin-bottom: 0;
}

.references-list {
    margin: 0.5rem 0 0 1.2rem;
}

.references-list li {
    margin-bottom: 0.8rem;
}

.muted {
    color: #444444;
}

@media (max-width: 680px) {
    .wrapper {
        width: calc(100% - 1.2rem);
    }

    section {
        padding: 0.8rem;
    }

    .meta-grid,
    .benefits-grid,
    .persona-grid,
    .prototype-grid,
    .mvp-grid,
    .appendix-grid,
    .model-grid,
    .testing-grid,
    .marketing-grid,
    .split-table,
    .canvas-grid {
        grid-template-columns: 1fr;
    }
}