/* ─── PROJECT CASE-STUDY PAGES ────────────────────────────────────────────────
   Shared stylesheet for projects/*.html.
   Extends style.css (tokens + reset) — always load style.css first.
   ─────────────────────────────────────────────────────────────────────────── */

/* ── HEADER ──────────────────────────────────────────────────────────────── */
.cs-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 13, 19, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-soft);
}

.cs-header-inner {
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.88rem;
  color: var(--text-mid);
  transition: color 0.2s ease;
}
.cs-back svg { width: 15px; height: 15px; transition: transform 0.25s var(--ease-out); }
.cs-back:hover { color: var(--copper-hi); }
.cs-back:hover svg { transform: translateX(-3px); }

.cs-header-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-low);
}

/* ── HERO ────────────────────────────────────────────────────────────────── */
.cs-hero {
  position: relative;
  padding: 4.5rem 0 3.5rem;
  border-bottom: 1px solid var(--line-soft);
  background:
    radial-gradient(ellipse 70% 90% at 80% -20%, rgba(207, 144, 97, 0.07), transparent),
    var(--bg-1);
  overflow: hidden;
}

.cs-breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--text-low);
  margin-bottom: 1.6rem;
}
.cs-breadcrumb a { color: var(--copper); }
.cs-breadcrumb a:hover { color: var(--copper-hi); }

.cs-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1.4rem; }
.cs-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--copper-hi);
  background: var(--copper-dim);
}

.cs-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text-hi);
  max-width: 20ch;
}

.cs-subtitle {
  margin-top: 1.3rem;
  max-width: 44rem;
  font-size: 1.04rem;
  line-height: 1.75;
  color: var(--text-mid);
}

.cs-stats {
  margin-top: 2.6rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 820px;
}
.cs-stat { background: var(--bg-2); padding: 1.15rem 1.35rem 1rem; }
.cs-stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  color: var(--copper-hi);
  font-variant-numeric: tabular-nums;
}
.cs-stat-label {
  display: block;
  margin-top: 0.25rem;
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--text-low);
}

/* ── LAYOUT ──────────────────────────────────────────────────────────────── */
.cs-main { padding: 3.5rem 0 5.5rem; }

.cs-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 3rem;
  align-items: start;
}

.cs-media {
  grid-column: 1 / -1;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--bg-2);
}
.cs-media img { width: 100%; height: auto; }

.cs-media--placeholder {
  aspect-ratio: 21 / 9;
  display: grid;
  place-items: center;
  background:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px),
    var(--bg-1);
  background-size: 60px 60px, 60px 60px, auto;
}
.cs-media-note {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-low);
  letter-spacing: 0.08em;
}

/* ── BODY SECTIONS ───────────────────────────────────────────────────────── */
.cs-body { min-width: 0; }

.cs-section + .cs-section { margin-top: 3.2rem; }

.cs-section-title {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--text-hi);
  margin-bottom: 1.3rem;
}
.cs-section-title::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--copper);
  flex-shrink: 0;
}

.cs-section p { margin-bottom: 1.1rem; font-size: 0.96rem; }
.cs-section p:last-child { margin-bottom: 0; }
.cs-section a { color: var(--copper-hi); border-bottom: 1px solid rgba(207, 144, 97, 0.35); }
.cs-section a:hover { border-bottom-color: var(--copper-hi); }

/* Numbered workflow steps */
.cs-steps { counter-reset: step; display: grid; gap: 1rem; }
.cs-steps li {
  counter-increment: step;
  position: relative;
  padding: 1.15rem 1.3rem 1.15rem 3.6rem;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  font-size: 0.92rem;
  line-height: 1.65;
  transition: border-color 0.25s ease, transform 0.3s var(--ease-out);
}
.cs-steps li:hover { border-color: var(--line); transform: translateX(4px); }
.cs-steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 1.15rem;
  top: 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--copper);
}
.cs-steps strong { color: var(--text-hi); font-weight: 600; }

/* Tool / data-layer grid */
.cs-tools {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}
.cs-tool {
  padding: 1.1rem 1.25rem;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color 0.25s ease, transform 0.3s var(--ease-out);
}
.cs-tool:hover { border-color: var(--line); transform: translateY(-3px); }
.cs-tool-name {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--copper-hi);
  margin-bottom: 0.3rem;
}
.cs-tool-role { display: block; font-size: 0.82rem; line-height: 1.6; color: var(--text-mid); }

/* Outcome list */
.cs-outcomes { display: grid; gap: 0.85rem; }
.cs-outcomes li {
  position: relative;
  padding-left: 1.7rem;
  font-size: 0.94rem;
  line-height: 1.7;
}
.cs-outcomes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.45em;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--green-dim);
  border: 1px solid var(--green);
}
.cs-outcomes li::after {
  content: "";
  position: absolute;
  left: 4px;
  top: calc(0.45em + 4px);
  width: 6px;
  height: 3px;
  border-left: 1.5px solid var(--green);
  border-bottom: 1.5px solid var(--green);
  transform: rotate(-45deg);
}

/* ── SIDEBAR ─────────────────────────────────────────────────────────────── */
.cs-sidebar {
  position: sticky;
  top: 88px;
  display: grid;
  gap: 1rem;
}

.cs-panel {
  padding: 1.5rem 1.6rem;
  background: var(--bg-2);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
}

.cs-panel-title {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-low);
  margin-bottom: 1.1rem;
}

.cs-details { display: grid; gap: 0.75rem; }
.cs-details > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.83rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed var(--line-soft);
}
.cs-details > div:last-child { border-bottom: none; padding-bottom: 0; }
.cs-details dt { color: var(--text-low); }
.cs-details dd { color: var(--text-hi); text-align: right; font-weight: 500; }

.cs-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  width: 100%;
  padding: 0.8rem 1.2rem;
  border-radius: 8px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  transition: transform 0.25s var(--ease-out), background 0.25s ease, border-color 0.25s ease;
}
.cs-btn svg { width: 14px; height: 14px; }

.cs-btn--primary {
  background: var(--copper);
  color: #17100a;
}
.cs-btn--primary:hover { background: var(--copper-hi); transform: translateY(-2px); }

.cs-btn--ghost { border: 1px solid var(--line); color: var(--text-hi); }
.cs-btn--ghost:hover { border-color: var(--copper); background: var(--copper-dim); transform: translateY(-2px); }

/* ── NEXT PROJECT FOOTER ─────────────────────────────────────────────────── */
.cs-next {
  border-top: 1px solid var(--line-soft);
  background: var(--bg-1);
}
.cs-next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 2.6rem 0;
  transition: padding-left 0.3s var(--ease-out);
}
.cs-next-link:hover { padding-left: 0.8rem; }

.cs-next-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-low);
}
.cs-next-title {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.2rem, 3vw, 1.7rem);
  color: var(--text-hi);
  transition: color 0.25s ease;
}
.cs-next-link:hover .cs-next-title { color: var(--copper-hi); }
.cs-next-link svg { width: 26px; height: 26px; color: var(--copper); flex-shrink: 0; }

/* ── ENTRY ANIMATION ─────────────────────────────────────────────────────── */
@keyframes csIn {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: none; }
}
.cs-hero .container > * { animation: csIn 0.7s var(--ease-out) backwards; }
.cs-hero .cs-breadcrumb { animation-delay: 0ms; }
.cs-hero .cs-tags       { animation-delay: 70ms; }
.cs-hero .cs-title      { animation-delay: 140ms; }
.cs-hero .cs-subtitle   { animation-delay: 210ms; }
.cs-hero .cs-stats      { animation-delay: 300ms; }

@media (prefers-reduced-motion: reduce) {
  .cs-hero .container > * { animation: none; }
}

/* ── RESPONSIVE ──────────────────────────────────────────────────────────── */
@media (max-width: 900px) {
  .cs-layout { grid-template-columns: 1fr; }
  .cs-sidebar { position: static; }
}

@media (max-width: 600px) {
  .cs-hero { padding: 3rem 0 2.5rem; }
  .cs-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cs-main { padding: 2.5rem 0 4rem; }
}