/* ---------------------------------------------------------------
   Portfolio site — single stylesheet, no framework, no build step.
   Palette matches the LinkedIn banner.
   --------------------------------------------------------------- */

:root {
  --ink:       #16202B;
  --ink-soft:  #4A5C6E;
  --ink-faint: #7C8FA0;
  --paper:     #FBFAF7;
  --paper-alt: #F2F0EA;
  --rule:      #E2DFD6;
  --dark:      #0F1720;
  --dark-alt:  #1B2733;
  --blue:      #2B7CA0;
  --amber:     #B8791F;
  --amber-br:  #E8A33D;

  --measure: 68ch;
  --wide: 1100px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Helvetica, Arial, sans-serif;
  font-size: 18px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 28px; }
.narrow { max-width: var(--measure); margin: 0 auto; padding: 0 28px; }

a { color: var(--blue); text-decoration: none; border-bottom: 1px solid rgba(43,124,160,.3); }
a:hover { border-bottom-color: var(--blue); }

/* ---------- nav ---------- */

.nav {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky; top: 0; z-index: 10;
}
.nav-in {
  max-width: var(--wide); margin: 0 auto; padding: 16px 28px;
  display: flex; align-items: center; gap: 28px; flex-wrap: wrap;
}
.nav a { border: 0; color: var(--ink-soft); font-size: 15.5px; }
.nav a:hover { color: var(--ink); }
.nav .brand { font-weight: 700; color: var(--ink); margin-right: auto; font-size: 16.5px; letter-spacing: -0.2px; }
.nav a.on { color: var(--ink); font-weight: 600; }

/* ---------- hero ---------- */

.hero { background: var(--dark); color: #F5F8FA; padding: 88px 0 76px; }
.hero h1 {
  font-size: clamp(30px, 4.6vw, 50px);
  line-height: 1.12; letter-spacing: -1.1px; font-weight: 700;
  margin: 0 0 26px; max-width: 20ch;
}
.hero p { font-size: 20px; color: #B9C7D4; max-width: 60ch; margin: 0 0 34px; }

.btns { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 22px; border-radius: 6px;
  font-size: 16px; font-weight: 600; border: 0;
}
.btn-a { background: var(--amber-br); color: #17222E; }
.btn-a:hover { background: #F0B357; }
.btn-b { background: transparent; color: #F5F8FA; box-shadow: inset 0 0 0 1.5px #43566A; }
.btn-b:hover { box-shadow: inset 0 0 0 1.5px #7C8FA0; }

/* ---------- proof bar ---------- */

.proof { background: var(--dark-alt); color: #F5F8FA; padding: 22px 0; }
.proof-in {
  max-width: var(--wide); margin: 0 auto; padding: 0 28px;
  display: flex; gap: 44px; flex-wrap: wrap;
}
.proof b { font-size: 25px; font-weight: 700; display: block; letter-spacing: -0.5px; }
.proof span { font-size: 14px; color: #8FA2B3; }

/* ---------- sections ---------- */

section { padding: 68px 0; }
section.alt { background: var(--paper-alt); border-block: 1px solid var(--rule); }

h2 { font-size: 15px; text-transform: uppercase; letter-spacing: 2px;
     color: var(--ink-faint); font-weight: 700; margin: 0 0 30px; }

/* ---------- case cards ---------- */

.card {
  display: block; border: 1px solid var(--rule); border-radius: 10px;
  padding: 30px 32px; margin-bottom: 18px; background: var(--paper);
  color: inherit; transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--blue); transform: translateY(-2px); }
.card h3 { margin: 0 0 12px; font-size: 25px; letter-spacing: -0.5px; line-height: 1.25; }
.card p { margin: 0 0 16px; color: var(--ink-soft); font-size: 17px; }
.card .go { color: var(--blue); font-weight: 600; font-size: 16px; }

/* ---------- thesis block ---------- */

.thesis { background: var(--dark); color: #F5F8FA; padding: 66px 0; }
.thesis .big {
  font-size: clamp(23px, 3.1vw, 33px); font-weight: 700;
  line-height: 1.35; letter-spacing: -0.6px; margin: 0 0 22px; max-width: 24ch;
}
.thesis p { color: #B9C7D4; max-width: 58ch; margin: 0; font-size: 18px; }
.thesis .rule { width: 54px; height: 3px; background: var(--amber-br); margin-bottom: 30px; }

/* ---------- two doors ---------- */

.doors { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.door { border: 1px solid var(--rule); border-radius: 10px; padding: 30px 32px; background: var(--paper); }
.door h3 { margin: 0 0 12px; font-size: 21px; }
.door p { color: var(--ink-soft); font-size: 17px; margin: 0 0 16px; }
@media (max-width: 720px) { .doors { grid-template-columns: 1fr; } }

/* ---------- prose ---------- */

.prose { max-width: var(--measure); margin: 0 auto; padding: 60px 28px 20px; }
.prose h1 { font-size: clamp(28px, 4vw, 41px); line-height: 1.16; letter-spacing: -1px; margin: 0 0 10px; }
.prose .dek { font-size: 20px; color: var(--ink-soft); margin: 0 0 8px; line-height: 1.5; }
.prose .stamp { font-size: 14.5px; color: var(--ink-faint); margin: 0 0 40px;
                padding-bottom: 22px; border-bottom: 1px solid var(--rule); }
.prose h2 { font-size: 26px; text-transform: none; letter-spacing: -0.5px;
            color: var(--ink); margin: 52px 0 16px; }
.prose h3 { font-size: 20px; margin: 36px 0 12px; letter-spacing: -0.2px; }
.prose p, .prose li { font-size: 18px; }
.prose li { margin-bottom: 8px; }
.prose blockquote {
  margin: 26px 0; padding: 4px 0 4px 22px;
  border-left: 3px solid var(--amber-br); color: var(--ink-soft);
}
.prose hr { border: 0; border-top: 1px solid var(--rule); margin: 46px 0; }
.prose code {
  background: var(--paper-alt); padding: 2px 6px; border-radius: 4px;
  font-size: 15.5px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
.prose pre {
  background: var(--dark); color: #D7E1EA; padding: 22px 24px; border-radius: 8px;
  overflow-x: auto; font-size: 13.5px; line-height: 1.55;
}
.prose pre code { background: 0; padding: 0; color: inherit; font-size: inherit; }

table { border-collapse: collapse; width: 100%; margin: 26px 0; font-size: 16px; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-size: 13.5px; text-transform: uppercase; letter-spacing: 0.8px; color: var(--ink-faint); }

/* ---------- callout ---------- */

.note {
  background: var(--paper-alt); border-left: 3px solid var(--blue);
  padding: 20px 24px; margin: 30px 0; border-radius: 0 8px 8px 0;
}
.note p { margin: 0; font-size: 16.5px; color: var(--ink-soft); }
.note strong { color: var(--ink); }

/* ---------- footer ---------- */

footer { background: var(--dark); color: #8FA2B3; padding: 50px 0; margin-top: 80px; font-size: 15.5px; }
footer a { color: #B9C7D4; border-bottom-color: rgba(185,199,212,.28); }
footer a:hover { color: #F5F8FA; }
footer .self { margin-top: 16px; color: var(--amber-br); font-size: 14.5px; }
footer .row { display: flex; gap: 22px; flex-wrap: wrap; margin-bottom: 6px; }

/* ---------- misc ---------- */

.todo { background: #FFF4D6; border: 1px solid #E8C77A; color: #6B4E10;
        padding: 14px 18px; border-radius: 8px; margin: 22px 0; font-size: 16px; }
.todo strong { color: #4A3506; }

@media (max-width: 640px) {
  body { font-size: 17px; }
  section { padding: 48px 0; }
  .hero { padding: 60px 0 52px; }
  .proof-in { gap: 26px; }
}