/* ==========================================================================
   Project case-study pages
   ========================================================================== */

.page-hero {
    padding-top: 150px;
    padding-bottom: 60px;
}

.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    font-size: 0.82rem;
    color: var(--muted-color);
    margin-bottom: 22px;
}

.breadcrumb a {
    color: var(--main-color);
}

.breadcrumb i {
    font-size: 0.9rem;
}

.page-hero .page-title {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    line-height: 1.15;
    margin-bottom: 12px;
}

.page-hero .page-sub {
    color: var(--main-color);
    font-weight: 500;
    font-size: 1.05rem;
    margin-bottom: 14px;
}

.page-hero .page-desc {
    color: var(--muted-color);
    font-size: var(--p-font);
    line-height: 1.8;
    max-width: 780px;
    margin-bottom: 26px;
}

.page-hero .hero-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

/* Project page content layout */
.project-layout {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 40px;
    align-items: start;
}

.project-toc {
    position: sticky;
    top: 100px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
}

.project-toc h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--main-color);
    margin-bottom: 12px;
}

.project-toc a {
    display: block;
    font-size: 0.86rem;
    color: var(--second-color);
    padding: 6px 0;
    transition: color 0.25s ease, padding-left 0.25s ease;
}

.project-toc a:hover {
    color: var(--main-color);
    padding-left: 6px;
}

.project-content {
    min-width: 0;
}

.toc-content .toc-section {
    margin-bottom: 48px;
    scroll-margin-top: 100px;
}

.toc-section h2 {
    font-size: 1.45rem;
    margin-bottom: 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.toc-section h2::before {
    content: '// ';
    color: var(--main-color);
    font-weight: 600;
}

.toc-section h3 {
    font-size: 1.05rem;
    margin: 18px 0 8px;
    color: var(--main-color);
}

.toc-section p {
    color: var(--second-color);
    line-height: 1.8;
    margin-bottom: 12px;
}

.toc-section ul {
    display: grid;
    gap: 8px;
    margin: 10px 0 14px;
}

.toc-section ul li {
    color: var(--second-color);
    font-size: 0.95rem;
    line-height: 1.6;
    padding-left: 20px;
    position: relative;
}

.toc-section ul li::before {
    content: '\203A';
    position: absolute;
    left: 0;
    color: var(--main-color);
    font-weight: 700;
}

/* stat cards */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 14px;
    margin: 18px 0;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 18px 16px;
    text-align: center;
}

.stat-card strong {
    display: block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.25rem;
    color: var(--main-color);
}

.stat-card span {
    font-size: 0.78rem;
    color: var(--muted-color);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* tech table */
.tech-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.tech-table th,
.tech-table td {
    text-align: left;
    padding: 12px 16px;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--border-color);
}

.tech-table th {
    background: var(--chip-bg);
    color: var(--main-color);
    font-weight: 600;
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.tech-table td { color: var(--second-color); }
.tech-table tr:last-child td { border-bottom: none; }

/* endpoint / code blocks */
.code-block {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 16px 18px;
    overflow-x: auto;
    margin: 12px 0 18px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    line-height: 1.8;
    color: #c9d1d9;
    white-space: pre;
}

.light-mode .code-block { color: #24292f; }

.code-block .m { color: var(--main-color); }   /* method */
.code-block .g { color: #98c379; }             /* green */
.code-block .k { color: #c678dd; }             /* keyword */
.code-block .c { color: #6a737d; }             /* comment */
.light-mode .code-block .c { color: #8b949e; }

.endpoint {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.82rem;
    background: var(--chip-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    margin-bottom: 8px;
    display: flex;
    gap: 10px;
    align-items: baseline;
    flex-wrap: wrap;
}

.endpoint .http {
    color: var(--main-color);
    font-weight: 700;
    flex: none;
}

.endpoint .path {
    color: var(--text-color);
    flex: 1;
    min-width: 180px;
    word-break: break-all;
}

.endpoint .desc {
    color: var(--muted-color);
    font-size: 0.78rem;
}

/* architecture flow (reuses .flow from index) */
.flow-step small {
    display: block;
    font-size: 0.7rem;
    color: var(--muted-color);
    font-weight: 400;
}

.legend {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin: 14px 0;
    font-size: 0.82rem;
    color: var(--muted-color);
}

.legend span::before {
    content: '';
    display: inline-block;
    width: 10px;
    height: 10px;
    border-radius: 3px;
    margin-right: 6px;
    background: var(--main-color);
}

.legend .extra::before { background: #e06c75; }

.callout {
    border-left: 3px solid var(--main-color);
    background: var(--chip-bg);
    padding: 14px 18px;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    margin: 16px 0;
    font-size: 0.92rem;
    color: var(--second-color);
}

.pagination {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    margin-top: 50px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.pagination a {
    font-size: 0.9rem;
    color: var(--main-color);
    font-weight: 500;
}

/* responsive */
@media (max-width: 900px) {
    .project-layout { grid-template-columns: 1fr; gap: 24px; }
    .project-toc { position: static; }
    .page-hero { padding-top: 120px; }
}

@media (max-width: 480px) {
    .stat-grid { grid-template-columns: 1fr 1fr; }
    .endpoint { font-size: 0.75rem; }
}