/* ============================================
   SOPHIA GUO — CASE STUDY SHARED STYLES
   Inherits CSS variables from style.css
   ============================================ */

/* ── Page Setup ── */
.cs-page {
  padding-top: 80px;
}

/* ── Layout Containers ── */
.cs-wrap {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 48px;
}
.cs-wide {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 48px;
}

/* ── Back Link ── */
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  letter-spacing: 0.02em;
  transition: color 0.2s, gap 0.2s;
  margin-bottom: 48px;
}
.cs-back:hover { color: var(--accent); gap: 12px; }
.cs-back-arrow { font-size: 16px; transition: transform 0.2s; }
.cs-back:hover .cs-back-arrow { transform: translateX(-3px); }

/* ── Hero ── */
.cs-hero {
  padding: 56px 48px 72px;
}
.cs-project-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.cs-project-label-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}
.cs-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 6vw, 72px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin-bottom: 28px;
  max-width: 800px;
}
.cs-lead {
  font-size: 19px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 620px;
  margin-bottom: 48px;
}
.cs-meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-top: 1px solid var(--card-border);
  padding-top: 32px;
}
.cs-meta-item {
  flex: 1;
  min-width: 140px;
  padding-right: 32px;
}
.cs-meta-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 6px;
}
.cs-meta-value {
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
}

/* ── Cover Image ── */
.cs-cover-wrap {
  padding: 0 48px 80px;
}
.cs-cover-wrap img {
  width: 100%;
  border-radius: 24px;
  display: block;
}

/* ── Sections ── */
.cs-section {
  padding: 88px 0;
}
.cs-section + .cs-section {
  border-top: 1px solid var(--card-border);
}
.cs-section.warm-bg {
  background: var(--warm);
  border-top: none;
  border-bottom: none;
  padding: 88px 48px;
  margin: 0;
}

/* ── Section Labels & Headings ── */
.cs-eyebrow {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.cs-heading {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 24px;
}
.cs-subheading {
  font-family: var(--font-serif);
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--fg);
  margin-bottom: 16px;
}
.cs-body {
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 640px;
}
.cs-body + .cs-body { margin-top: 16px; }
.cs-body strong { color: var(--fg); font-weight: 500; }

/* ── Two-column Layout ── */
.cs-cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.cs-cols-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.cs-cols-ratio {
  display: grid;
  grid-template-columns: 5fr 4fr;
  gap: 72px;
  align-items: start;
}

/* ── Callout Box ── */
.cs-callout {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-left: 4px solid var(--accent);
  border-radius: 12px;
  padding: 28px 32px;
  margin: 32px 0;
}
.cs-callout-label {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.cs-callout p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg);
}
.cs-callout.accent2 { border-left-color: var(--accent2); }
.cs-callout.accent2 .cs-callout-label { color: var(--accent2); }
.cs-callout.accent3 { border-left-color: var(--accent3); }
.cs-callout.accent3 .cs-callout-label { color: var(--accent3); }

/* ── Impact List ── */
.cs-impact-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: 8px;
}
.cs-impact-list li {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 12px;
  padding: 20px 24px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--muted);
}
.cs-impact-list li strong {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 4px;
}

/* ── Images ── */
.cs-img-block {
  margin: 40px 0;
}
.cs-img-block img {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--card-border);
  display: block;
}
.cs-img-block.no-border img { border: none; }
.cs-img-block.sharp img { border-radius: 0; }
.cs-img-caption {
  font-size: 13px;
  color: var(--muted);
  margin-top: 12px;
  text-align: center;
  letter-spacing: 0.01em;
}

/* ── Canvas Explorations Grid ── */
.cs-canvas-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin: 32px 0;
}
.cs-canvas-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0;
}
.cs-canvas-card img {
  width: 100%;
  display: block;
  border-radius: 0;
  border: none;
}
.cs-canvas-card-body {
  padding: 16px 20px;
}
.cs-canvas-card-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 4px;
}
.cs-canvas-card-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Solution Items ── */
.cs-solution-num {
  font-family: var(--font-serif);
  font-size: 64px;
  color: rgba(244,99,58,0.1);
  line-height: 1;
  margin-bottom: -16px;
}
.cs-solution-section {
  padding: 64px 0;
  border-top: 1px solid var(--card-border);
}
.cs-solution-section:first-child { border-top: none; }

/* ── Constraint Tags ── */
.cs-constraint-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 16px;
}
.cs-constraint-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px 20px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 10px;
}
.cs-constraint-num {
  font-size: 12px;
  font-weight: 500;
  color: var(--accent2);
  background: rgba(124,92,191,0.08);
  border-radius: 50%;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 1px;
}
.cs-constraint-text strong {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 2px;
}
.cs-constraint-text span {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Stats ── */
.cs-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--card-border);
  border-radius: 20px;
  overflow: hidden;
}
.cs-stat {
  background: var(--card-bg);
  padding: 48px 40px;
  text-align: center;
}
.cs-stat-num {
  font-family: var(--font-serif);
  font-size: 52px;
  line-height: 1;
  color: var(--accent);
  margin-bottom: 12px;
}
.cs-stat-label {
  font-size: 15px;
  line-height: 1.5;
  color: var(--fg);
  font-weight: 500;
  margin-bottom: 8px;
}
.cs-stat-desc {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.5;
}

/* ── Reflection Cards ── */
.cs-reflection-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-top: 16px;
}
.cs-reflection-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 20px;
  padding: 32px;
  transition: transform 0.3s var(--ease-spring), box-shadow 0.3s;
}
.cs-reflection-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0,0,0,0.08);
}
.cs-reflection-num {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--accent);
  margin-bottom: 12px;
}
.cs-reflection-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--fg);
  margin-bottom: 12px;
  line-height: 1.3;
}
.cs-reflection-body {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ── Next Case Study ── */
.cs-next {
  background: var(--fg);
  color: var(--bg);
  padding: 88px 48px;
  text-align: center;
}
.cs-next-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(250,248,244,0.5);
  margin-bottom: 16px;
}
.cs-next-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.1;
  color: var(--bg);
  margin-bottom: 12px;
}
.cs-next-org {
  font-size: 15px;
  color: rgba(250,248,244,0.5);
  margin-bottom: 40px;
}
.cs-next-cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--fg);
  background: var(--bg);
  padding: 14px 32px;
  border-radius: 100px;
  transition: background 0.2s, transform 0.2s var(--ease-spring);
}
.cs-next-cta:hover {
  background: var(--accent);
  color: #fff;
  transform: scale(1.04);
}

/* ── Scroll Reveals ── */
.cs-reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.cs-reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ── Back to Top ── */
.back-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 48px; height: 48px;
  background: var(--fg);
  color: var(--bg);
  border: none;
  border-radius: 50%;
  font-size: 20px;
  cursor: none;
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.3s, transform 0.3s var(--ease-spring), background 0.2s;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}
.back-top.visible { opacity: 1; transform: translateY(0); }
.back-top:hover { background: var(--accent); }

/* ── Footer (same as main) ── */
.footer {
  background: var(--fg);
  color: var(--bg);
  padding: 48px;
}
.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 32px;
}
.footer-name {
  font-family: var(--font-serif);
  font-size: 20px;
  margin-bottom: 4px;
}
.footer-tagline { font-size: 14px; color: rgba(250,248,244,0.5); }
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-end;
}
.footer-links a {
  font-size: 14px;
  color: rgba(250,248,244,0.6);
  transition: color 0.2s;
}
.footer-links a:hover { color: var(--bg); }
.footer-bar {
  display: flex;
  justify-content: space-between;
  padding-top: 24px;
  border-top: 1px solid rgba(250,248,244,0.1);
  font-size: 13px;
  color: rgba(250,248,244,0.35);
}

/* ── Responsive ── */
@media (max-width: 900px) {
  .cs-hero, .cs-cover-wrap { padding-left: 24px; padding-right: 24px; }
  .cs-wrap, .cs-wide { padding: 0 24px; }
  .cs-cols-2, .cs-cols-ratio { grid-template-columns: 1fr; gap: 40px; }
  .cs-cols-3 { grid-template-columns: 1fr; }
  .cs-stats { grid-template-columns: 1fr; }
  .cs-reflection-grid { grid-template-columns: 1fr; }
  .cs-canvas-grid { grid-template-columns: 1fr; }
  .cs-meta-strip { flex-direction: column; gap: 24px; }
  .cs-section.warm-bg { padding: 72px 24px; }
  .cs-next { padding: 72px 24px; }
  .footer { padding: 40px 24px; }
}
@media (max-width: 600px) {
  .cs-title { font-size: 36px; }
  .cs-heading { font-size: 28px; }
  .cs-stat-num { font-size: 40px; }
  .cs-reflection-card { padding: 24px; }
}