/* ─── PBK Case Study — Dark Theme ─── */

:root {
  --bg:     #1a1a1a;
  --raised: #242424;
  --border: rgba(232,228,216,0.10);
  --text:   #e8e4d8;
  --body:   rgba(232,228,216,0.78);
  --muted:  rgba(232,228,216,0.40);
  --gold:   #c8901a;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--body);
  font-family: 'EB Garamond', Georgia, serif;
  font-size: 19px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--gold); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── TOP BAR ─── */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  display: flex; align-items: center; gap: 20px;
  padding: 0 32px; height: 50px;
  background: rgba(26,26,26,0.95);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.topbar-home { font-family: 'Space Mono', monospace; font-size: 13px; letter-spacing: .1em; color: var(--text); margin-right: auto; }
.topbar-home b { color: var(--gold); }
.topbar-tag { font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); }
.topbar-resume { font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--gold); border: 1px solid var(--gold); padding: 4px 10px; border-radius: 2px; transition: background .15s; }
.topbar-resume:hover { background: rgba(200,144,26,.12); text-decoration: none; }
.topbar-theme {
  background: none; border: none; cursor: pointer; padding: 5px;
  color: var(--muted); transition: color .15s;
  display: flex; align-items: center; flex-shrink: 0;
}
.topbar-theme:hover { color: var(--text); }
.topbar-theme .icon-sun  { display: block; }
.topbar-theme .icon-moon { display: none; }
html.light .topbar-theme .icon-sun  { display: none; }
html.light .topbar-theme .icon-moon { display: block; }

/* ─── SECTION NAV ─── */
.section-nav {
  position: sticky; top: 50px; z-index: 100;
  display: flex; align-items: center;
  padding: 0 40px;
  background: rgba(26,26,26,0.95);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}
.section-nav a {
  font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .14em;
  text-transform: uppercase; color: var(--muted);
  padding: 14px 20px; display: block;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color .2s, border-color .2s;
}
.section-nav a:hover { color: var(--text); text-decoration: none; }
.section-nav a.active { color: var(--gold); border-bottom-color: var(--gold); }
.section-nav::-webkit-scrollbar { display: none; }

/* ─── WRAP ─── */
.wrap { max-width: 800px; margin: 0 auto; padding: 0 32px; }

/* ─── HERO ─── */
.hero { padding: 72px 0 56px; }
.hero-eyebrow {
  font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .2em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 22px;
}
h1.title {
  font-family: 'Alexandria', sans-serif; font-weight: 200;
  font-size: clamp(48px, 7vw, 92px);
  line-height: .93; letter-spacing: -.03em; text-transform: uppercase;
  color: var(--text); margin-bottom: 28px;
}
h1.title em { font-style: normal; color: var(--gold); }
.hero-dek {
  font-size: clamp(19px, 2.2vw, 23px); line-height: 1.5;
  color: var(--body); max-width: 640px; margin-bottom: 36px;
}

/* ─── META STRIP ─── */
.meta-strip {
  display: flex; flex-wrap: wrap; gap: 10px 28px;
  padding: 18px 0; border-top: 1px solid var(--border);
  margin-bottom: 36px;
}
.meta-item { display: flex; align-items: baseline; gap: 10px; }
.meta-item .mk {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .16em;
  text-transform: uppercase; color: var(--muted); flex-shrink: 0;
}
.meta-item .mv { font-size: 15px; color: var(--body); line-height: 1.4; }

/* ─── SKILLS ─── */
.skills { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 44px; }
.skill {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--gold);
  border: 1px solid rgba(200,144,26,0.35); border-radius: 3px; padding: 5px 10px;
}

/* ─── IMPACT ROW ─── */
.impact-row {
  display: grid; grid-template-columns: repeat(4,1fr);
  gap: 2px; background: var(--border);
  border: 1px solid var(--border); border-radius: 6px; overflow: hidden;
}
.impact { background: var(--raised); padding: 22px 20px; }
.impact .n {
  font-family: 'Alexandria', sans-serif; font-weight: 200; font-size: 40px;
  line-height: 1; letter-spacing: -.02em; color: var(--text);
}
.impact .n em { font-style: normal; color: var(--gold); }
.impact .d {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); margin-top: 8px; line-height: 1.5;
}

/* ─── SECTIONS ─── */
section { padding: 72px 0 0; scroll-margin-top: 100px; }
.sec-label {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .22em;
  text-transform: uppercase; color: var(--gold); margin-bottom: 6px;
}
.sec-num { font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .1em; color: var(--muted); margin-right: 10px; }
h2.sec-title {
  font-family: 'Alexandria', sans-serif; font-weight: 300;
  font-size: clamp(22px, 3vw, 32px); letter-spacing: .1em; text-transform: uppercase;
  color: var(--text); margin-bottom: 28px;
  border-top: 1px solid var(--border); padding-top: 14px;
}

/* ─── PROSE ─── */
.prose { color: var(--body); }
.prose p { margin-bottom: 20px; max-width: 680px; }
.prose p:last-child { margin-bottom: 0; }
.prose b { color: var(--text); font-weight: 500; }
.prose i { color: var(--text); }
.mono { font-family: 'Space Mono', monospace; font-size: 14px; }

/* ─── PULL QUOTE ─── */
.pull {
  font-family: 'Alexandria', sans-serif; font-weight: 300;
  font-size: clamp(20px, 2.4vw, 26px); line-height: 1.35;
  color: var(--text); max-width: 680px;
  border-left: 3px solid var(--gold); padding-left: 22px;
  margin: 32px 0;
}

/* ─── PILLAR HEADS ─── */
.pillar {
  font-family: 'Alexandria', sans-serif; font-weight: 300;
  font-size: 15px; letter-spacing: .2em; text-transform: uppercase;
  color: var(--muted); margin: 52px 0 18px;
  padding-top: 22px; border-top: 1px solid var(--border);
}

/* ─── FIGURES ─── */
figure { margin: 28px 0; }
.frame {
  background: var(--raised); border: 1px solid var(--border);
  border-radius: 5px; padding: clamp(14px, 3vw, 28px); overflow: hidden;
}
.frame.dark { padding: 0; }
figure img { width: 100%; display: block; border-radius: 3px; }
figure svg { width: 100%; height: auto; display: block; }
figcaption {
  font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); margin-top: 10px;
  display: flex; gap: 12px;
}
.fig-n { color: var(--gold); }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media(max-width:600px) { .two-col { grid-template-columns: 1fr; } }

/* ─── LISTS ─── */
.cs-list { list-style: none; max-width: 680px; margin: 16px 0; }
.cs-list li {
  display: grid; grid-template-columns: 80px 1fr; gap: 16px;
  padding: 14px 0; border-bottom: 1px solid var(--border); color: var(--body);
}
.cs-list li .k {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--gold); padding-top: 5px;
}
.cs-list li b { color: var(--text); font-weight: 500; }

/* ─── STATS ─── */
.stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px,1fr));
  gap: 2px; background: var(--border);
  border: 1px solid var(--border); border-radius: 5px; overflow: hidden;
  margin: 28px 0;
}
.stat { background: var(--raised); padding: 24px 22px; }
.stat .n {
  font-family: 'Alexandria', sans-serif; font-weight: 200; font-size: 44px;
  line-height: 1; letter-spacing: -.02em; color: var(--text);
}
.stat .n em { font-style: normal; color: var(--gold); }
.stat .d {
  font-family: 'Space Mono', monospace; font-size: 10px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--muted); margin-top: 8px; line-height: 1.5;
}

/* ─── FOOTER ─── */
.cs-footer {
  margin-top: 80px; border-top: 1px solid var(--border);
  padding: 24px 0 80px;
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px;
  font-family: 'Space Mono', monospace; font-size: 12px; letter-spacing: .08em; color: var(--muted);
}
.cs-footer .lab { color: var(--gold); letter-spacing: .14em; margin-right: 8px; }
.cs-footer a { color: var(--body); }
.smallnote {
  font-family: 'Space Mono', monospace; font-size: 11px; letter-spacing: .05em;
  color: var(--muted); max-width: 640px; margin-top: 8px; line-height: 1.6;
}

/* ─── LIGHT THEME ─── */
html.light {
  --bg:     #f0ebe0;
  --raised: #e8dfd0;
  --border: rgba(26,22,18,0.12);
  --text:   #1a1612;
  --body:   rgba(26,22,18,0.78);
  --muted:  rgba(26,22,18,0.45);
  --gold:   #885800;
}
html.light .topbar    { background: rgba(240,235,224,0.96); }
html.light .section-nav { background: rgba(240,235,224,0.96); }
html.light .skill     { border-color: rgba(136,88,0,0.30); }
html.light .topbar-resume:hover { background: rgba(136,88,0,.10); }

/* ─── RESPONSIVE ─── */
@media(max-width:640px) {
  .wrap { padding: 0 20px; }
  .hero { padding: 56px 0 44px; }
  h1.title { font-size: 40px; }
  .impact-row { grid-template-columns: 1fr 1fr; }
  .section-nav { padding: 0 20px; }
}