/* ============================================================
   Portfolio: shared styles. Light, calm, editorial.
   Design system: tokens → base → components.
   Swap the placeholder name / bio / links marked <!-- EDIT -->.
   ============================================================ */

/* ---------- design tokens ---------- */
:root{
  /* surfaces */
  --bg:#f6f8fc;          /* page */
  --bg-2:#ffffff;
  --surface:#ffffff;     /* cards */
  --surface-2:#f1f4fa;   /* subtle fills */
  /* text */
  --ink:#0f1626;         /* headings */
  --body:#3a4655;        /* paragraph text */
  --dim:#5a6675;         /* secondary */
  --faint:#8a93a3;       /* labels / captions */
  /* lines */
  --line:#e5e9f2;
  --line-2:#eef1f8;
  /* brand */
  --accent:#2f6bff;      /* primary blue */
  --accent-ink:#1c4fd6;  /* accent as text on light */
  --accent-soft:#eaf1ff;
  --accent-2:#7c4dff;    /* violet */
  --accent-2-ink:#6636e6;
  --accent-2-soft:#f0ebff;
  --teal:#0e9f97;
  /* effects */
  --radius:18px;
  --radius-sm:12px;
  --shadow-sm:0 1px 2px rgba(15,22,38,.04),0 2px 4px rgba(15,22,38,.05);
  --shadow:0 4px 14px rgba(15,22,38,.07),0 2px 6px rgba(15,22,38,.04);
  --shadow-lg:0 18px 44px rgba(15,22,38,.12),0 6px 14px rgba(15,22,38,.06);
  --ring:0 0 0 3px rgba(47,107,255,.28);
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,'SF Mono','Roboto Mono',Menlo,Consolas,monospace;
}

/* ---------- base ---------- */
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--body);
  font-family:var(--font);font-size:16px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  background-image:
    radial-gradient(52% 44% at 88% -8%,rgba(47,107,255,.10),transparent 60%),
    radial-gradient(44% 40% at -4% 2%,rgba(124,77,255,.09),transparent 58%);
  background-attachment:fixed;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{color:var(--ink)}
::selection{background:rgba(47,107,255,.16)}
.wrap{max-width:1060px;margin:0 auto;padding:0 28px}
:focus-visible{outline:none;box-shadow:var(--ring);border-radius:8px}
section{padding:72px 0;scroll-margin-top:80px}

/* ---------- top nav ---------- */
.nav{position:sticky;top:0;z-index:20;
  background:rgba(246,248,252,.82);backdrop-filter:saturate(1.4) blur(14px);
  border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;gap:22px;height:66px}
.nav .brand{font-weight:800;letter-spacing:-.02em;font-size:21px;color:var(--ink)}
.nav .links{margin-left:auto;display:flex;align-items:center;gap:26px;font-size:14.5px;color:var(--dim);font-weight:500}
.nav .links a:not(.btn-sm):hover{color:var(--ink)}
.nav .btn-sm{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:600;
  color:#fff;background:var(--accent);padding:8px 15px;border-radius:999px;transition:.16s;
  box-shadow:var(--shadow-sm)}
.nav .btn-sm:hover{background:var(--accent-ink);transform:translateY(-1px)}
.nav .back{margin-left:auto;color:var(--dim);font-size:14.5px;font-weight:500}
.nav .back:hover{color:var(--ink)}

/* ---------- hero ---------- */
.hero{padding:46px 0 52px}
.pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;
  color:var(--accent-ink);background:var(--accent-soft);border:1px solid rgba(47,107,255,.18);
  padding:6px 13px;border-radius:999px;margin-bottom:22px}
.pill .dot{width:7px;height:7px;border-radius:50%;background:var(--teal);
  box-shadow:0 0 0 3px rgba(14,159,151,.18)}
.hero .eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:1.4px;text-transform:uppercase;
  color:var(--accent-ink);margin-bottom:18px;font-weight:600}
.hero h1{font-size:clamp(38px,6.2vw,62px);line-height:1.04;letter-spacing:-.032em;margin:0 0 20px;
  font-weight:800;color:var(--ink);max-width:15ch}
.hero .lede{font-size:clamp(17.5px,2.3vw,21px);color:var(--dim);max-width:660px;margin:0;line-height:1.6}
.hero .cta{margin-top:34px;display:flex;gap:12px;flex-wrap:wrap}
.hero-copy{max-width:680px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;font-weight:600;font-size:15px;
  padding:13px 22px;border-radius:999px;border:1px solid var(--line);background:var(--surface);
  color:var(--ink);transition:.16s;cursor:pointer;box-shadow:var(--shadow-sm)}
.btn:hover{border-color:#cdd6e6;transform:translateY(-1px);box-shadow:var(--shadow)}
.btn.primary{background:var(--accent);color:#fff;border-color:transparent}
.btn.primary:hover{background:var(--accent-ink)}
.btn .arrow{transition:transform .16s}
.btn:hover .arrow{transform:translateX(3px)}

/* ---------- section headers ---------- */
.sec-head{display:flex;align-items:baseline;gap:16px;margin-bottom:12px}
.sec-head h2{font-size:13px;letter-spacing:1.6px;text-transform:uppercase;color:var(--accent-ink);
  font-weight:700;margin:0}
.sec-head .rule{flex:1;height:1px;background:var(--line)}
.sec-intro{font-size:19px;color:var(--dim);max-width:620px;margin:0 0 34px;line-height:1.55}

/* ---------- about ---------- */
.about p{font-size:19px;color:var(--body);max-width:700px;margin:0 0 18px;line-height:1.68}
.about .lead-in{font-size:22px;color:var(--ink);font-weight:600;letter-spacing:-.01em;line-height:1.5}
.about .muted{color:var(--dim);font-size:17px}
.tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:26px}
.tag{font-size:13px;font-weight:500;color:var(--dim);background:var(--surface);
  border:1px solid var(--line);border-radius:999px;padding:7px 14px;box-shadow:var(--shadow-sm)}

/* ---------- capabilities ("how I work") ---------- */
.caps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cap{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 22px;box-shadow:var(--shadow-sm);transition:.18s}
.cap:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:#d5deee}
.cap .n{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;
  font-family:var(--mono);font-size:13px;font-weight:600;color:var(--accent-ink);
  background:var(--accent-soft);border-radius:10px;margin-bottom:16px}
.cap h4{margin:0 0 8px;font-size:16.5px;letter-spacing:-.01em}
.cap p{margin:0;color:var(--dim);font-size:14.5px;line-height:1.58}

/* ---------- case-study grid ---------- */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.card{position:relative;display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius);padding:30px 28px;
  box-shadow:var(--shadow-sm);transition:.2s;overflow:hidden}
.card::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--accent),#6ea8ff);opacity:0;transition:.2s}
.card.violet::before{background:linear-gradient(90deg,var(--accent-2),#a98bff)}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#d3ddef}
.card:hover::before{opacity:1}
.card .thumb{margin:-30px -28px 22px;border-bottom:1px solid var(--line);background:#0d1220;overflow:hidden}
.card .thumb img{width:100%;height:186px;object-fit:cover;object-position:top center;display:block;transition:transform .35s ease}
.card:hover .thumb img{transform:scale(1.03)}
.card .kind{font-family:var(--mono);font-size:11.5px;letter-spacing:.7px;text-transform:uppercase;
  color:var(--accent-ink);font-weight:600}
.card.violet .kind{color:var(--accent-2-ink)}
.card h3{font-size:23px;margin:12px 0 10px;letter-spacing:-.02em;font-weight:750}
.card p{color:var(--body);font-size:15.5px;margin:0 0 20px;line-height:1.62;flex:1}
.card .chips{display:flex;flex-wrap:wrap;gap:7px;margin-bottom:22px}
.chip{font-size:11.5px;font-weight:500;color:var(--dim);background:var(--surface-2);
  border:1px solid var(--line);border-radius:7px;padding:4px 9px}
.card .meta{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--faint);
  padding-top:16px;border-top:1px solid var(--line-2)}
.card .go{margin-left:auto;display:inline-flex;align-items:center;gap:6px;
  color:var(--accent-ink);font-weight:650;font-size:14px}
.card.violet .go{color:var(--accent-2-ink)}
.card .go .arrow{transition:transform .16s}
.card:hover .go .arrow{transform:translateX(3px)}

/* ---------- contact band ---------- */
.contact-band{background:linear-gradient(135deg,#0f1626,#1b2740);border-radius:24px;
  padding:56px 48px;text-align:center;box-shadow:var(--shadow-lg);
  background-image:linear-gradient(135deg,#0f1626,#1b2740),
    radial-gradient(60% 120% at 85% -10%,rgba(47,107,255,.4),transparent 60%);}
.contact-band h2{color:#fff;font-size:clamp(26px,4vw,38px);letter-spacing:-.02em;margin:0 0 12px;font-weight:750}
.contact-band p{color:#b9c4d6;font-size:18px;max-width:520px;margin:0 auto 28px}
.contact-band .cta{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.contact-band .btn{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.18);color:#fff;box-shadow:none}
.contact-band .btn:hover{background:rgba(255,255,255,.15)}
.contact-band .btn.primary{background:#fff;color:#0f1626;border-color:transparent}
.contact-band .btn.primary:hover{background:#eef2f9}

/* ---------- project detail ---------- */
.detail{padding-top:56px;padding-bottom:20px}
.detail .eyebrow{font-family:var(--mono);font-size:12.5px;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--accent-ink);margin-bottom:16px;font-weight:600}
.detail.violet .eyebrow{color:var(--accent-2-ink)}
.detail h1{font-size:clamp(32px,5.2vw,50px);line-height:1.06;letter-spacing:-.03em;margin:0 0 18px;
  font-weight:800;color:var(--ink)}
.detail .sub{font-size:20px;color:var(--dim);max-width:700px;margin:0 0 30px;line-height:1.55}
.detail .cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:44px}
.meta-row{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:40px}
.meta-row .m{flex:1 1 180px;display:flex;flex-direction:column;gap:5px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:15px 18px;box-shadow:var(--shadow-sm)}
.meta-row .m .k{font-size:11px;letter-spacing:.7px;text-transform:uppercase;color:var(--faint);font-weight:700}
.meta-row .m .v{font-size:15px;color:var(--ink);font-weight:550}

/* TL;DR band */
.tldr{position:relative;background:var(--accent-soft);border:1px solid rgba(47,107,255,.18);
  border-radius:var(--radius);padding:24px 26px 24px 30px;margin:0 0 40px;max-width:780px;overflow:hidden}
.tldr::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--accent)}
.detail.violet .tldr{background:var(--accent-2-soft);border-color:rgba(124,77,255,.2)}
.detail.violet .tldr::before{background:var(--accent-2)}
.tldr .k{font-size:11.5px;letter-spacing:.8px;text-transform:uppercase;color:var(--accent-ink);
  font-weight:700;margin-bottom:9px}
.detail.violet .tldr .k{color:var(--accent-2-ink)}
.tldr p{margin:0;font-size:18.5px;color:var(--ink);line-height:1.5;font-weight:500}

/* demo screenshot */
.shot{margin:0 0 44px}
.shot .frame{position:relative;border-radius:16px;overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow-lg);background:#0d1220;line-height:0}
.shot img{width:100%;height:auto;display:block}
.shot .tag{position:absolute;top:14px;left:14px;display:inline-flex;align-items:center;gap:7px;
  font-size:12px;font-weight:600;color:#fff;background:rgba(10,14,24,.72);backdrop-filter:blur(6px);
  border:1px solid rgba(255,255,255,.16);padding:6px 12px;border-radius:999px;line-height:1}
.shot .tag .dot{width:7px;height:7px;border-radius:50%;background:var(--teal);
  box-shadow:0 0 0 3px rgba(14,159,151,.28)}
.shot .tag.proto .dot{background:#f0b429;box-shadow:0 0 0 3px rgba(240,180,41,.26)}
.shot figcaption{margin-top:13px;font-size:14px;color:var(--faint);max-width:740px;line-height:1.55}
/* paired figures: two shots side by side (two platforms / two sides of the product) */
.shot-duo{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start;margin:0 0 14px}
.shot-duo .frame{height:100%}
.shot-duo.panels{grid-template-columns:1fr 1fr;gap:20px;justify-items:center}
.shot-duo.panels .frame{background:#0b1120}
.shot-cap{font-size:14px;color:var(--faint);max-width:760px;line-height:1.55;margin:0 0 44px}
.shot-cap b{color:var(--dim)}
/* per-platform interface gallery: a labelled row of interface states */
.plat-h{display:flex;align-items:baseline;gap:10px;margin:0 0 12px;font-size:16px;font-weight:700;color:var(--ink)}
.plat-h span{font-family:var(--mono);font-size:11.5px;font-weight:500;letter-spacing:.4px;text-transform:uppercase;color:var(--faint)}
/* wider gallery: break out beyond the text column so the states read larger */
.shot.wide{width:min(1320px,94vw);margin-left:50%;transform:translateX(-50%)}
.shot-tri{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:0 0 12px}
.shot-tri .frame{position:relative}
.shot-duo .frame{position:relative}
.kbrow{position:relative;margin-top:14px}
.shot-tri .step{position:absolute;left:10px;bottom:10px;font-size:11px;font-weight:600;color:#fff;
  background:rgba(10,14,24,.72);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.16);
  padding:4px 10px;border-radius:999px;line-height:1}
@media (max-width:680px){ .shot-duo{grid-template-columns:1fr} .shot-tri{grid-template-columns:1fr} .shot.wide{width:auto;margin-left:0;transform:none} }

/* prose */
.prose h3{font-size:13px;letter-spacing:1.4px;text-transform:uppercase;color:var(--accent-ink);
  font-weight:700;margin:44px 0 14px}
.detail.violet .prose h3{color:var(--accent-2-ink)}
.prose p{font-size:17.5px;color:var(--body);max-width:740px;margin:0 0 17px;line-height:1.72}
.prose ul{max-width:740px;padding-left:0;margin:0 0 17px;list-style:none}
.prose li{position:relative;font-size:17px;color:var(--body);margin-bottom:12px;padding-left:26px;line-height:1.62}
.prose li::before{content:"";position:absolute;left:4px;top:11px;width:7px;height:7px;border-radius:50%;
  background:var(--accent);opacity:.85}
.detail.violet .prose li::before{background:var(--accent-2)}
.prose li b,.prose p b{color:var(--ink);font-weight:650}
.prose em{color:var(--ink);font-style:italic}
.callout{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--accent);
  border-radius:0 12px 12px 0;padding:20px 22px;margin:28px 0;color:var(--dim);font-size:16px;
  max-width:740px;line-height:1.6;box-shadow:var(--shadow-sm)}
.callout b{color:var(--ink)}
.detail.violet .callout{border-left-color:var(--accent-2)}

/* ---------- reasoning transcript (tutor<->student exchange as text, demo UI) ---------- */
.transcript{background:#0c1320;border:1px solid #ffffff14;border-radius:16px;
  box-shadow:var(--shadow-lg);overflow:hidden;color:#eaf2fb;height:100%;display:flex;flex-direction:column}
.transcript .ts-hd{display:flex;align-items:center;gap:10px;padding:12px 16px;
  border-bottom:1px solid #ffffff10;background:#0a111c}
.transcript .ts-tag{font-size:10px;font-weight:800;letter-spacing:.6px;text-transform:uppercase;
  color:#241a02;background:#f5b544;padding:4px 10px;border-radius:999px}
.transcript .ts-sub{margin-left:auto;font-family:var(--mono);font-size:10.5px;color:#6b7f95}
.transcript .ts-body{padding:15px 16px;display:flex;flex-direction:column;gap:10px}
.t-turn{max-width:92%}
.t-turn .who{display:block;font-size:9px;font-weight:800;letter-spacing:.5px;text-transform:uppercase;
  margin:0 0 5px 2px;color:#f5b544}
.t-turn .bubble{font-size:13.5px;line-height:1.5;padding:10px 12px;border-radius:10px}
.t-turn.tutor{align-self:flex-start}
.t-turn.tutor .bubble{background:#131c29;border:1px solid #ffffff12;border-left:3px solid #f5b544;color:#eaf2fb}
.t-turn.student{align-self:flex-end}
.t-turn.student .bubble{background:#1c2b3f;border:1px solid #ffffff1c;color:#eaf2fb}
.t-turn em{font-style:italic;font-weight:600;color:#fff}
.ts-tbl{width:100%;border-collapse:collapse;margin:8px 0 2px;font-size:11.5px}
.ts-tbl th,.ts-tbl td{border:1px solid #ffffff14;padding:5px 7px;text-align:left;color:#c9d6e5}
.ts-tbl th{background:#0e1826;color:#8ea1b5;font-weight:600;font-size:10.5px}
.ts-tbl td:first-child{color:#fff;font-weight:600}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);margin-top:36px;padding:40px 0 64px;
  color:var(--faint);font-size:14px}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px;align-items:center}
footer .links{margin-left:auto;display:flex;gap:22px;font-weight:500}
footer a:hover{color:var(--ink)}

/* ---------- resume ---------- */
.resume{padding-top:52px;padding-bottom:20px}
.resume .sub{margin-bottom:14px}
.resume .contact{display:flex;flex-wrap:wrap;gap:6px 20px;margin:0 0 30px;font-size:15px;color:var(--dim)}
.resume .contact a{color:var(--accent-ink);font-weight:550}
.resume .contact a:hover{color:var(--accent)}
.res-summary{font-size:18px;color:var(--body);max-width:780px;margin:34px 0 0;line-height:1.62}
.res-summary b{color:var(--ink);font-weight:650}
.res-group{margin-top:44px}
.res-item{padding:20px 0;border-top:1px solid var(--line-2)}
.res-item:first-of-type{border-top:none;padding-top:16px}
.rhead{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:2px 18px;margin-bottom:2px}
.rrole{font-size:17px;font-weight:700;color:var(--ink);letter-spacing:-.01em}
.rrole .co{color:var(--accent-ink);font-weight:650}
.rmeta{font-family:var(--mono);font-size:12.5px;letter-spacing:.3px;color:var(--faint);white-space:nowrap}
.res-item ul{list-style:none;padding-left:0;margin:12px 0 0;max-width:840px}
.res-item li{position:relative;padding-left:22px;margin-bottom:8px;font-size:15.5px;color:var(--body);line-height:1.6}
.res-item li::before{content:"";position:absolute;left:2px;top:9px;width:6px;height:6px;border-radius:50%;
  background:var(--accent);opacity:.8}
.res-item li b{color:var(--ink);font-weight:650}
.res-note{font-size:13.5px;color:var(--faint);font-style:italic;margin:12px 0 0}
.res-edu .res-item{padding:14px 0}
.res-skills{display:grid;grid-template-columns:auto 1fr;gap:12px 24px;max-width:840px;margin-top:16px}
.res-skills dt{font-family:var(--mono);font-size:11.5px;letter-spacing:.6px;text-transform:uppercase;
  color:var(--faint);font-weight:700;padding-top:3px}
.res-skills dd{margin:0;font-size:15px;color:var(--body);line-height:1.55}
@media (max-width:560px){
  .rmeta{white-space:normal}
  .res-skills{grid-template-columns:1fr;gap:3px 0}
  .res-skills dd{margin-bottom:12px}
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  .caps{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:680px){
  .wrap{padding:0 20px}
  section{padding:52px 0}
  .grid{grid-template-columns:1fr}
  .caps{grid-template-columns:1fr}
  .nav .links a:not(.btn-sm){display:none}
  .hero{padding:60px 0 36px}
  .contact-band{padding:40px 24px}
  .meta-row .m{flex-basis:100%}
}

/* ---------- motion / a11y ---------- */
@media (prefers-reduced-motion:reduce){
  *{transition:none!important;scroll-behavior:auto!important}
}