/* ============================================================
   case-study.css — Case study page specific styles
   Barbara Virsik Portfolio · barbaravirsik.com
   ============================================================ */

/* Additional token for case study */
:root {
  --read: 720px;
}

/* ── Reading Progress Bar ── */
#progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  background: var(--accent);
  width: 0%;
  z-index: 200;
  transition: width 0.1s linear;
}

/* ── Back link in nav ── */
.nav-back {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: gap 0.2s;
}
.nav-back:hover { gap: 0.65rem; }
.nav-back svg { flex-shrink: 0; }

/* ── HERO ── */
.cs-hero { background: var(--dark-bg); padding: 4rem 3rem; }
.cs-hero-grid {
  max-width: var(--wide);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: 4rem;
  align-items: center;
}
.cs-hero-meta { display: flex; align-items: center; gap: 1rem; margin-bottom: 1.5rem; }
.cs-hero-tag { font-size: 0.68rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); font-weight: 600; }
.cs-hero-sep { color: rgba(255,255,255,0.15); font-size: 0.7rem; }
.cs-hero-date { font-size: 0.68rem; letter-spacing: 0.12em; text-transform: uppercase; color: rgba(255,255,255,0.28); }
.cs-page-title { font-family: var(--serif); font-size: clamp(2.2rem, 4vw, 3.4rem); font-weight: 700; color: white; line-height: 1.07; letter-spacing: -0.025em; margin-bottom: 0.9rem; }
.cs-page-subtitle { font-family: var(--serif); font-style: italic; font-size: 1rem; color: rgba(255,255,255,0.6); line-height: 1.55; margin-bottom: 1.4rem; border-left: 3px solid var(--accent); padding-left: 1.1rem; }
.cs-page-desc { font-size: 0.88rem; color: rgba(255,255,255,0.42); line-height: 1.75; margin-bottom: 2rem; }
.cs-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.cs-chip { font-size: 0.7rem; padding: 4px 12px; background: rgba(15,102,116,0.18); border: 1px solid rgba(15,102,116,0.35); border-radius: 20px; color: rgba(255,255,255,0.5); }

/* Hero visual — puzzle image with teal border accent */
.cs-hero-visual { position: relative; }
.cs-hero-visual::before {
  content: '';
  position: absolute;
  top: -12px; right: -12px;
  width: 100%; height: 100%;
  border: 1.5px solid rgba(15,102,116,0.3);
  border-radius: 12px;
  z-index: 0;
}
.cs-hero-visual img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: 10px;
  display: block;
  position: relative;
  z-index: 1;
}

/* ── ARTICLE LAYOUT ── */
.article-outer { padding: 3rem 3rem 7rem; }
.prose { max-width: var(--read); margin: 0 auto; }
.fig-wrap { max-width: 900px; margin: 0 auto; }
.evo-wrap { max-width: 1060px; margin: 0 auto; }

/* Section eyebrow labels */
.s-eyebrow {
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  display: block;
  margin-top: 4rem;
  margin-bottom: 0.5rem;
}
.s-eyebrow:first-child { margin-top: 0; }

/* Article headings */
h2.art-h2 { font-family: var(--serif); font-size: 1.72rem; font-weight: 700; color: var(--ink); line-height: 1.2; letter-spacing: -0.015em; margin-bottom: 1.4rem; }
h3.art-h3 { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; color: var(--ink); line-height: 1.3; margin-top: 2.8rem; margin-bottom: 0.85rem; }

/* Body text */
.prose p { font-size: 1rem; color: var(--ink-mid); line-height: 1.87; margin-bottom: 1.3rem; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 600; color: var(--ink); }
.prose em { font-style: italic; }

/* Pull quote */
.pull-quote { border-left: 3px solid var(--accent); padding: 0.5rem 0 0.5rem 1.4rem; margin: 2rem 0; }
.pull-quote p { font-family: var(--serif); font-style: italic; font-size: 1.08rem; color: var(--ink); line-height: 1.6; margin-bottom: 0 !important; }

/* Highlight block */
.highlight-block { background: var(--accent-light); border-radius: 8px; padding: 1.2rem 1.6rem; margin: 1.8rem 0; border-left: 3px solid var(--accent); }
.highlight-block p { color: var(--ink); font-style: italic; margin-bottom: 0 !important; }

/* Section rule */
hr.s-rule { border: none; border-top: 1px solid var(--border); margin: 3.5rem 0; }

/* ── FIGURE CARDS ── */
.fig-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 1.8rem 2rem 1.5rem; margin: 3rem auto; }
.fig-eyebrow { font-size: 0.62rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); font-weight: 600; margin-bottom: 0.3rem; }
.fig-title { font-family: var(--serif); font-size: 1rem; font-weight: 600; color: var(--ink); line-height: 1.3; margin-bottom: 0.2rem; }
.fig-caption { font-size: 0.78rem; color: var(--ink-faint); font-style: italic; margin-bottom: 0; }
.fig-chart { margin-top: 1.4rem; position: relative; height: 380px; }
.fig-source { font-size: 0.7rem; color: var(--ink-faint); font-style: italic; margin-top: 1rem; padding-top: 0.8rem; border-top: 1px solid var(--border); }

/* ── EVOLUTION TIMELINE (light mode) ── */
.evo-card { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 2.4rem 2rem 2rem; margin: 2.8rem auto; }
.evo-header { margin-bottom: 2.2rem; }
.evo-fig-eye { font-size: 0.62rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent); font-weight: 600; margin-bottom: 0.3rem; }
.evo-fig-title { font-family: var(--serif); font-size: 1rem; font-weight: 600; color: var(--ink); margin-bottom: 0.2rem; }
.evo-fig-caption { font-size: 0.75rem; color: var(--ink-muted); font-style: italic; }
.evo-eras { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; align-items: start; position: relative; margin-top: 1rem; }
.evo-connector { position: absolute; top: 34px; left: calc(10% + 10px); right: calc(10% + 10px); height: 1px; background: rgba(15,102,116,0.18); z-index: 0; }
.evo-era { display: flex; flex-direction: column; align-items: center; text-align: center; padding: 0 0.6rem; position: relative; z-index: 1; }
.evo-icon { font-size: 1.3rem; margin-bottom: 0.45rem; line-height: 1; }
.evo-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); border: 2px solid var(--surface); box-shadow: 0 0 0 2px rgba(15,102,116,0.25); margin-bottom: 0.8rem; flex-shrink: 0; }
.evo-decade { font-size: 0.64rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); margin-bottom: 0.3rem; }
.evo-name { font-family: var(--serif); font-size: 0.9rem; font-weight: 600; color: var(--ink); margin-bottom: 0.65rem; line-height: 1.3; }
.evo-bullets { list-style: none; text-align: left; width: 100%; }
.evo-bullets li { font-size: 0.74rem; color: var(--ink-mid); line-height: 1.6; margin-bottom: 0.28rem; padding-left: 0.85rem; position: relative; }
.evo-bullets li::before { content: '–'; position: absolute; left: 0; color: var(--accent); opacity: 0.45; }
.evo-card-source { font-size: 0.68rem; color: var(--ink-faint); margin-top: 1.8rem; font-style: italic; padding-top: 0.8rem; border-top: 1px solid var(--border); }

/* ── AI TRANSPARENCY BOX ── */
.ai-box { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 2rem 2.2rem; margin: 2.5rem 0; }
.ai-box-eye { font-size: 0.65rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-muted); font-weight: 600; display: block; margin-bottom: 0.7rem; }
.ai-box h2 { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; color: var(--ink); margin-bottom: 1.1rem; line-height: 1.3; }
.ai-box p { font-size: 0.93rem; color: var(--ink-mid); line-height: 1.82; margin-bottom: 0.95rem; }
.ai-box p:last-child { margin-bottom: 0; }

/* ── SOURCES ── */
#sources { background: var(--surface); padding: 5rem 3rem 6rem; border-top: 1px solid var(--border); }
.sources-inner { max-width: var(--read); margin: 0 auto; }
.source-group { margin-bottom: 2.5rem; }
.source-group h4 { font-size: 0.68rem; letter-spacing: 0.15em; text-transform: uppercase; color: var(--ink-faint); font-weight: 600; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border); }
.source-item { margin-bottom: 0.9rem; }
.source-item .s-name { font-size: 0.88rem; font-weight: 500; color: var(--ink); margin-bottom: 0.15rem; }
.source-item a { font-size: 0.78rem; color: var(--accent); text-decoration: none; word-break: break-all; display: block; line-height: 1.55; }
.source-item a:hover { text-decoration: underline; }

/* ── CASE STUDY FOOTER ── */
.cs-footer { background: var(--dark-bg); padding: 4rem 3rem; text-align: center; }
.cs-footer-back { display: inline-flex; align-items: center; gap: 0.5rem; color: rgba(255,255,255,0.45); font-size: 0.88rem; font-weight: 500; text-decoration: none; margin-bottom: 1.2rem; transition: color 0.2s, gap 0.2s; }
.cs-footer-back:hover { color: var(--accent); gap: 0.72rem; }
.cs-footer-copy { font-size: 0.72rem; color: rgba(255,255,255,0.2); }

/* ── RESPONSIVE ── */
@media (max-width: 900px) {
  .cs-hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .cs-hero-visual img { height: 260px; }
  .cs-hero-visual::before { display: none; }
}
@media (max-width: 780px) {
  .evo-eras { grid-template-columns: 1fr 1fr; gap: 1.8rem; }
  .evo-connector { display: none; }
  .evo-era { align-items: flex-start; text-align: left; }
  .article-outer, .cs-hero, #sources, .cs-footer { padding-left: 1.5rem; padding-right: 1.5rem; }
  .nav-inner { padding: 0 1.5rem; }
}
@media (max-width: 480px) {
  .evo-eras { grid-template-columns: 1fr; }
}