/* ==========================================================================
   Project case studies. Loaded after style.css and post.css.
   ========================================================================== */

.cs-head { padding-top: 88px; padding-bottom: 40px; }
.cs-head h1 { font-size: clamp(38px, 6vw, 60px); font-weight: 600; letter-spacing: -.045em; line-height: 1.05; }
.cs-tagline { margin-top: 10px; font-size: clamp(18px, 2.4vw, 22px); color: var(--text-3); letter-spacing: -.01em; }
.cs-summary { margin-top: 20px; max-width: 680px; font-size: 17px; color: var(--text-2); line-height: 1.7; }
.cs-links { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 28px; }

.cs-meta {
  display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 44px;
  border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev);
}
.cs-meta > div { padding: 18px 20px; border-left: 1px solid var(--border); }
.cs-meta > div:first-child { border-left: 0; }
.cs-meta dt { font-size: 12px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--text-3); margin-bottom: 6px; }
.cs-meta dd { font-size: 14.5px; color: var(--text); line-height: 1.5; }
.cs-meta .cs-meta-stack { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--border); }

.cs-hero { aspect-ratio: 21 / 9; border: 1px solid var(--border); border-radius: var(--radius); }
.cs-hero.media-navy img { width: 60%; }
.cs-hero.media-milkiyat img { width: 66%; }

.cs-body { padding-top: 24px; padding-bottom: 96px; }
.cs-section {
  display: grid; grid-template-columns: 220px minmax(0, 680px); gap: 40px;
  padding: 48px 0; border-top: 1px solid var(--border);
}
.cs-section:first-child { border-top: 0; }
.cs-section h2 { font-size: 20px; font-weight: 600; letter-spacing: -.02em; padding-top: 2px; }
.cs-section--wide { grid-template-columns: 220px minmax(0, 1fr); }
.cs-section .prose ul { margin-top: 0; }

/* Architecture diagram */
.dg-wrap { overflow-x: auto; padding: 24px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); }
.dg { display: block; width: 100%; min-width: 640px; height: auto; font-family: var(--font); }
.dg-head { font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; fill: var(--text-3); }
.dg-box { fill: var(--bg); stroke: var(--border-strong); stroke-width: 1; }
.dg-box--accent { stroke: var(--accent); fill: color-mix(in srgb, var(--accent) 8%, var(--bg)); }
.dg-label { font-size: 13px; font-weight: 600; fill: var(--text); }
.dg-sub { font-size: 11px; fill: var(--text-3); }
.dg-line { fill: none; stroke: var(--text-3); stroke-width: 1.2; }
.dg-arrowhead { fill: var(--text-3); }
.dg-wrap figcaption { margin-top: 14px; font-size: 13px; color: var(--text-3); }

/* Decisions */
.decisions { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.decision { padding: 20px 22px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); }
.decision h3 { font-size: 15.5px; font-weight: 600; letter-spacing: -.01em; margin-bottom: 8px; }
.decision p { font-size: 14.5px; color: var(--text-2); line-height: 1.65; }

/* Results */
.results { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); }
.results > div { padding: 22px; border-left: 1px solid var(--border); }
.results > div:first-child { border-left: 0; }
.results b { display: block; font-size: 30px; font-weight: 600; letter-spacing: -.03em; color: var(--text); line-height: 1.1; }
.results span { display: block; margin-top: 6px; font-size: 13.5px; color: var(--text-2); line-height: 1.45; }

/* Pager */
.cs-pager { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 24px; padding-top: 48px; border-top: 1px solid var(--border); }
.cs-pager a { padding: 20px 22px; border: 1px solid var(--border); border-radius: var(--radius); transition: border-color .15s, background .15s; }
.cs-pager a:hover { border-color: var(--border-strong); background: var(--bg-elev); }
.cs-pager span { display: block; font-size: 13px; color: var(--text-3); }
.cs-pager b { display: block; margin-top: 4px; font-size: 18px; font-weight: 600; letter-spacing: -.02em; }
.cs-pager .next { text-align: right; }

@media (max-width: 860px) {
  .cs-meta { grid-template-columns: 1fr 1fr; }
  .cs-meta > div:nth-child(3) { border-left: 0; }
  .cs-meta > div:nth-child(n+3) { border-top: 1px solid var(--border); }
  .cs-section, .cs-section--wide { grid-template-columns: 1fr; gap: 18px; padding: 36px 0; }
  .results { grid-template-columns: 1fr 1fr; }
  .results > div:nth-child(3) { border-left: 0; }
  .results > div:nth-child(n+3) { border-top: 1px solid var(--border); }
}
@media (max-width: 720px) {
  .cs-head { padding-top: 56px; padding-bottom: 28px; }
  .cs-meta { grid-template-columns: 1fr; }
  .cs-meta > div { border-left: 0; border-top: 1px solid var(--border); }
  .cs-meta > div:first-child { border-top: 0; }
  .cs-hero { aspect-ratio: 16 / 9; }
  .decisions { grid-template-columns: 1fr; }
  .dg-wrap { padding: 16px; }
  .cs-pager { grid-template-columns: 1fr; }
  .cs-pager .next { text-align: left; }
}