/* ================================================================
   Mayank Gupta Portfolio — Shared Design System
   Portfolio Hifi design · Light mode · Cormorant + DM Sans + JetBrains Mono
   ================================================================ */

@import url('https://fonts.googleapis.com/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500;1,600&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,300&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Tokens ── */
:root {
  --bg: #faf9f6; --bg2: #f3f0ea; --bg3: #eae7de;
  --ink: #141210; --ink2: #514c46; --ink3: #8c8880; --ink4: #c4c0b4;
  --line: #e4e0d6; --line2: #ccc8bc;
  --v: #7c3aed; --vl: rgba(124,58,237,0.08); --vl2: rgba(124,58,237,0.15);
}

/* ── Reset ── */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { background: var(--bg); color: var(--ink); font-family: 'DM Sans', sans-serif; font-size: 16px; -webkit-font-smoothing: antialiased; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul, ol { list-style: none; }

/* ── Type helpers ── */
.serif { font-family: 'Cormorant Garamond', serif; }
.mono  { font-family: 'JetBrains Mono', monospace; }
.label { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink3); }
.v-color { color: var(--v); }

/* ── Nav ── */
nav.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--bg); border-bottom: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 52px; height: 66px;
}
.nav-brand { font-family: 'Cormorant Garamond', serif; font-size: 20px; font-weight: 500; cursor: pointer; }
.nav-brand em { font-style: italic; color: var(--v); }
.nav-links { display: flex; gap: 36px; }
.nav-link { font-size: 13px; font-weight: 400; color: var(--ink3); text-decoration: none; letter-spacing: .01em; transition: color .15s; padding: 4px 0; border-bottom: 1.5px solid transparent; }
.nav-link:hover { color: var(--ink); }
.nav-link.active { color: var(--v); border-bottom-color: var(--v); }
.nav-cta { font-size: 13px; font-weight: 500; color: var(--v); border-bottom: 1px solid var(--v); padding-bottom: 1px; transition: opacity .2s; }
.nav-cta:hover { opacity: .65; }

/* ── Buttons ── */
.btn-v { display: inline-flex; align-items: center; gap: 8px; background: var(--v); color: #fff; padding: 12px 24px; font-size: 13px; font-weight: 500; cursor: pointer; transition: opacity .2s; letter-spacing: .01em; border: none; font-family: 'DM Sans', sans-serif; }
.btn-v:hover { opacity: .85; }
.btn-outline { display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line2); padding: 12px 22px; font-size: 13px; color: var(--ink2); cursor: pointer; transition: all .2s; background: none; font-family: 'DM Sans', sans-serif; }
.btn-outline:hover { border-color: var(--v); color: var(--v); }
.btn-sm { padding: 8px 14px; font-size: 12px; font-family: 'JetBrains Mono', monospace; letter-spacing: .1em; text-transform: uppercase; display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--line2); color: var(--ink3); cursor: pointer; transition: all .2s; background: none; }
.btn-sm:hover { border-color: var(--v); color: var(--v); }

/* ── Chip ── */
.chip { display: inline-block; border: 1px solid var(--line2); padding: 3px 10px; font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink3); }
.chip-v { background: var(--vl); border-color: rgba(124,58,237,.2); color: var(--v); }

/* ── KPI row ── */
.kpi-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); margin-top: 48px; }
.kpi { padding: 28px 36px; border-right: 1px solid var(--line); }
.kpi:last-child { border-right: none; }
.kpi .kn { font-family: 'Cormorant Garamond', serif; font-size: 52px; line-height: 1; font-weight: 400; color: var(--ink); }
.kpi .kl { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--ink3); margin-top: 6px; }

/* ── Insight grid ── */
.insight-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); margin: 28px 0; }
.insight { padding: 24px; background: var(--bg); }
.insight .ins-num { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .16em; color: var(--v); margin-bottom: 10px; }
.insight .ins-text { font-size: 14px; line-height: 1.6; color: var(--ink2); }

/* ── Image placeholder ── */
.img-ph { border: 1px solid var(--line); background: var(--bg2); display: flex; align-items: center; justify-content: center; font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink4); margin: 28px 0; }
.img-ph img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* ── Pull quote ── */
.pull-quote { border-left: 3px solid var(--v); padding: 20px 28px; margin: 28px 0; background: var(--vl); }
.pull-quote p { font-family: 'Cormorant Garamond', serif; font-style: italic; font-size: 22px; line-height: 1.45; color: var(--ink); margin-bottom: 10px; }
.pull-quote cite { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink3); font-style: normal; }

/* ══════════════════════════════════════════════
   CASE STUDY LAYOUT
══════════════════════════════════════════════ */

/* Back bar */
.cs-back { padding: 20px 52px; border-bottom: 1px solid var(--line); display: flex; align-items: center; gap: 12px; }
.cs-back a { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .16em; text-transform: uppercase; color: var(--v); display: flex; align-items: center; gap: 6px; transition: opacity .2s; }
.cs-back a:hover { opacity: .65; }
.cs-back-index { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .14em; color: var(--ink4); }

/* CS hero */
.cs-hero { padding: 72px 52px 56px; border-bottom: 1px solid var(--line); }
.cs-hero-kicker { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 24px; }
.cs-hero h1 { font-family: 'Cormorant Garamond', serif; font-size: clamp(40px, 6vw, 80px); line-height: .96; font-weight: 400; letter-spacing: -.02em; max-width: 960px; margin-bottom: 24px; }
.cs-hero-desc { font-size: 16px; line-height: 1.7; color: var(--ink2); max-width: 680px; margin-bottom: 40px; }

/* CS body: TOC + content */
.cs-layout { display: grid; grid-template-columns: 200px 1fr; gap: 64px; padding: 64px 52px; align-items: start; }

/* Sticky TOC */
.cs-toc { position: sticky; top: 90px; align-self: start; }
.cs-toc-title { font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink4); margin-bottom: 16px; }
.cs-toc ol { list-style: none; }
.cs-toc li { padding: 8px 0 8px 14px; border-left: 1.5px solid var(--line); font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink3); cursor: pointer; transition: all .15s; }
.cs-toc li:hover { color: var(--ink); border-left-color: var(--ink); }
.cs-toc li.active { color: var(--v); border-left-color: var(--v); }
.cs-toc-links { margin-top: 32px; display: flex; flex-direction: column; gap: 8px; }

/* CS content */
.cs-content { min-width: 0; }
.cs-section { padding-bottom: 64px; border-bottom: 1px solid var(--line); margin-bottom: 64px; }
.cs-section:last-child { border-bottom: none; margin-bottom: 0; }
.cs-section-num { font-family: 'JetBrains Mono', monospace; font-size: 10px; letter-spacing: .2em; text-transform: uppercase; color: var(--v); margin-bottom: 12px; }
.cs-section h2 { font-family: 'Cormorant Garamond', serif; font-size: clamp(28px, 4vw, 44px); line-height: 1.05; font-weight: 400; letter-spacing: -.01em; margin-bottom: 20px; }
.cs-section p { font-size: 15px; line-height: 1.75; color: var(--ink2); margin-bottom: 16px; }
.cs-section ul { padding-left: 20px; margin-bottom: 16px; }
.cs-section ul li { font-size: 15px; line-height: 1.75; color: var(--ink2); margin-bottom: 6px; list-style: disc; }
.cs-section h3 { font-family: 'Cormorant Garamond', serif; font-size: 24px; font-weight: 500; color: var(--ink); margin: 24px 0 12px; }

/* CS image */
.cs-img { margin: 28px 0; border: 1px solid var(--line); }
.cs-img img { width: 100%; display: block; }
.cs-img-caption { font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink4); padding: 10px 16px; background: var(--bg2); border-top: 1px solid var(--line); }

/* CS meta strip (role/team/duration/tools) */
.cs-meta-strip { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border: 1px solid var(--line); margin-bottom: 40px; }
.cs-meta-item { padding: 20px 24px; border-right: 1px solid var(--line); }
.cs-meta-item:last-child { border-right: none; }
.cs-meta-label { font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink4); margin-bottom: 6px; }
.cs-meta-val { font-size: 14px; color: var(--ink2); line-height: 1.5; }

/* CS prev/next */
.cs-nav-strip { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--line); margin-top: 64px; }
.cs-nav-item { padding: 32px 52px; background: var(--bg); cursor: pointer; transition: background .2s; text-decoration: none; display: block; }
.cs-nav-item:hover { background: var(--bg2); }
.cs-nav-item .cni-label { font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .18em; text-transform: uppercase; color: var(--ink3); margin-bottom: 8px; }
.cs-nav-item .cni-title { font-family: 'Cormorant Garamond', serif; font-size: 28px; font-weight: 400; color: var(--ink); }
.cs-nav-item .cni-arr { font-size: 18px; color: var(--ink4); margin-top: 6px; transition: color .2s, transform .2s; display: inline-block; }
.cs-nav-item:hover .cni-arr { color: var(--v); }
.cs-nav-item.prev .cni-arr { display: inline-block; transform: scaleX(-1); }
.cs-nav-item.prev:hover .cni-arr { transform: scaleX(-1) translateX(-4px); }
.cs-nav-item.next { text-align: right; }
.cs-nav-item.next:hover .cni-arr { transform: translateX(4px); }

/* ── Footer ── */
.site-footer { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; padding: 52px 52px 64px; border-top: 1px solid var(--line); }
.site-footer .f-sig { font-family: 'Cormorant Garamond', serif; font-size: 32px; font-weight: 400; margin-bottom: 10px; }
.site-footer .f-fine { font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--ink4); line-height: 1.9; }
.site-footer h5 { font-family: 'JetBrains Mono', monospace; font-size: 9.5px; letter-spacing: .2em; text-transform: uppercase; color: var(--ink3); margin-bottom: 14px; }
.site-footer a { display: block; font-size: 13px; color: var(--ink2); padding: 3px 0; transition: color .15s; }
.site-footer a:hover { color: var(--v); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  nav.site-nav { padding: 0 24px; }
  .cs-back, .cs-hero { padding-left: 24px; padding-right: 24px; }
  .cs-layout { grid-template-columns: 1fr; gap: 40px; padding: 40px 24px; }
  .cs-toc { position: static; }
  .kpi-row { grid-template-columns: 1fr 1fr; }
  .kpi:nth-child(2) { border-right: none; }
  .kpi:nth-child(3) { border-top: 1px solid var(--line); }
  .cs-meta-strip { grid-template-columns: 1fr 1fr; }
  .cs-meta-item:nth-child(2) { border-right: none; }
  .cs-meta-item:nth-child(3) { border-top: 1px solid var(--line); }
  .cs-nav-strip { grid-template-columns: 1fr; }
  .insight-grid { grid-template-columns: 1fr; }
  .site-footer { padding: 40px 24px 48px; grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  .nav-links { display: none; }
  .cs-hero h1 { font-size: 36px; }
  .kpi-row { grid-template-columns: 1fr 1fr; }
  .cs-meta-strip { grid-template-columns: 1fr; }
  .cs-meta-item { border-right: none !important; border-bottom: 1px solid var(--line); }
  .cs-meta-item:last-child { border-bottom: none; }
}