/* ===========================================================
   Prisha Nag — portfolio design system
   Tokens -> base -> layout -> components -> utilities
   =========================================================== */

:root{
  --bg: #f7f5f0;
  --bg-raised: #ffffff;
  --bg-sunken: #eeebe3;
  --ink: #14191a;
  --ink-muted: #5a6360;
  --ink-faint: #8b938f;
  --line: rgba(20,25,26,0.12);
  --line-soft: rgba(20,25,26,0.07);

  --accent: #b5602c;
  --accent-ink: #ffffff;
  --accent-soft: rgba(181,96,44,0.11);

  --good: #3f8f6f;
  --good-soft: rgba(63,143,111,0.13);
  --warn: #a97a1f;
  --warn-soft: rgba(169,122,31,0.14);
  --crit: #a83f34;
  --crit-soft: rgba(168,63,52,0.13);

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "IBM Plex Mono", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, Inter, Arial, sans-serif;

  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(20,25,26,0.05);
  --shadow: 0 1px 2px rgba(20,25,26,0.05), 0 10px 28px rgba(20,25,26,0.07);
  --ease: cubic-bezier(.2,.7,.2,1);
  --container: 1120px;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg: #0f1417; --bg-raised: #171d21; --bg-sunken: #0b0f11;
    --ink: #eaeeec; --ink-muted: #9aa6a2; --ink-faint: #66716e;
    --line: rgba(234,238,236,0.14); --line-soft: rgba(234,238,236,0.07);
    --accent: #e2925c; --accent-ink: #1a1006; --accent-soft: rgba(226,146,92,0.15);
    --good: #63b697; --good-soft: rgba(99,182,151,0.14);
    --warn: #d6ac53; --warn-soft: rgba(214,172,83,0.14);
    --crit: #de8a7c; --crit-soft: rgba(222,138,124,0.14);
    --shadow: 0 1px 2px rgba(0,0,0,0.35), 0 14px 32px rgba(0,0,0,0.4);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  }
}
:root[data-theme="dark"]{
  --bg: #0f1417; --bg-raised: #171d21; --bg-sunken: #0b0f11;
  --ink: #eaeeec; --ink-muted: #9aa6a2; --ink-faint: #66716e;
  --line: rgba(234,238,236,0.14); --line-soft: rgba(234,238,236,0.07);
  --accent: #e2925c; --accent-ink: #1a1006; --accent-soft: rgba(226,146,92,0.15);
  --good: #63b697; --good-soft: rgba(99,182,151,0.14);
  --warn: #d6ac53; --warn-soft: rgba(214,172,83,0.14);
  --crit: #de8a7c; --crit-soft: rgba(222,138,124,0.14);
  --shadow: 0 1px 2px rgba(0,0,0,0.35), 0 14px 32px rgba(0,0,0,0.4);
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
}
:root[data-theme="light"]{
  --bg: #f7f5f0; --bg-raised: #ffffff; --bg-sunken: #eeebe3;
  --ink: #14191a; --ink-muted: #5a6360; --ink-faint: #8b938f;
  --line: rgba(20,25,26,0.12); --line-soft: rgba(20,25,26,0.07);
  --accent: #b5602c; --accent-ink: #ffffff; --accent-soft: rgba(181,96,44,0.11);
  --good: #3f8f6f; --good-soft: rgba(63,143,111,0.13);
  --warn: #a97a1f; --warn-soft: rgba(169,122,31,0.14);
  --crit: #a83f34; --crit-soft: rgba(168,63,52,0.13);
  --shadow: 0 1px 2px rgba(20,25,26,0.05), 0 10px 28px rgba(20,25,26,0.07);
  --shadow-sm: 0 1px 2px rgba(20,25,26,0.05);
}

/* ===== Base ===== */
*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
body,h1,h2,h3,h4,p,ul,ol,figure{ margin:0; }
body{
  background:var(--bg); color:var(--ink); font-family:var(--sans);
  line-height:1.6; font-size:16px; -webkit-font-smoothing:antialiased;
  transition:background-color .25s var(--ease), color .25s var(--ease);
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; padding:0; }
::selection{ background:var(--accent-soft); }
:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:4px; }
h1,h2,h3,h4{ font-weight:800; letter-spacing:-.01em; text-wrap:balance; }
p{ max-width:68ch; }
.mono{ font-family:var(--mono); }
code{ font-family:var(--mono); background:var(--bg-sunken); padding:.15em .4em; border-radius:5px; font-size:.9em; }
pre{ font-family:var(--mono); background:var(--bg-sunken); border:1px solid var(--line); border-radius:var(--radius-sm); padding:16px 18px; overflow-x:auto; font-size:13.5px; line-height:1.6; }
pre code{ background:none; padding:0; }
table{ border-collapse:collapse; width:100%; }
hr{ border:none; border-top:1px solid var(--line); }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

/* ===== Layout ===== */
.container{ width:min(var(--container), 92vw); margin-inline:auto; }
.container-wide{ width:min(1320px, 94vw); margin-inline:auto; }
.container-prose{ width:min(720px, 92vw); margin-inline:auto; }

/* ===== Header / nav ===== */
header.site{
  position:sticky; top:0; z-index:80; background:color-mix(in oklab, var(--bg) 88%, transparent);
  backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line-soft);
}
.nav{ display:flex; align-items:center; justify-content:space-between; gap:16px; padding:14px 0; }
.brand{ display:flex; align-items:center; gap:10px; font-weight:800; font-size:15px; letter-spacing:-.01em; }
.brand .dot{ width:9px; height:9px; border-radius:999px; background:var(--accent); flex:none; }
.navlinks{ display:flex; align-items:center; gap:2px; }
.navlinks a{ padding:8px 12px; border-radius:999px; color:var(--ink-muted); font-size:13.5px; font-weight:600; transition:background-color .18s var(--ease), color .18s var(--ease); white-space:nowrap; }
.navlinks a:hover, .navlinks a.active{ background:var(--bg-sunken); color:var(--ink); }
.navtools{ display:flex; align-items:center; gap:8px; }
.iconbtn{ width:36px; height:36px; display:grid; place-items:center; border-radius:999px; border:1px solid var(--line); background:var(--bg-raised); color:var(--ink-muted); cursor:pointer; transition:transform .15s var(--ease), color .15s var(--ease), border-color .15s var(--ease); }
.iconbtn:hover{ color:var(--ink); border-color:var(--ink-faint); }
.iconbtn:active{ transform:scale(.92); }
.navburger{ display:none; }
@media (max-width: 880px){
  .navlinks{ display:none; }
  .navlinks.open-mobile{
    display:flex; flex-direction:column; align-items:stretch; gap:2px;
    position:absolute; left:0; right:0; top:100%; margin:0 16px;
    background:var(--bg-raised); border:1px solid var(--line); border-radius:var(--radius-sm);
    box-shadow:var(--shadow); padding:8px;
  }
  .navlinks.open-mobile a{ padding:11px 14px; }
  .navburger{ display:grid; }
}

/* ===== Buttons ===== */
.btn{ display:inline-flex; align-items:center; justify-content:center; gap:8px; padding:11px 18px; border-radius:999px; border:1px solid var(--line); background:var(--bg-raised); font-weight:700; font-size:14px; box-shadow:var(--shadow-sm); cursor:pointer; transition:transform .15s var(--ease), box-shadow .2s var(--ease), background-color .18s var(--ease), border-color .18s var(--ease); }
.btn:hover{ transform:translateY(-1px); box-shadow:var(--shadow); }
.btn:active{ transform:translateY(0); }
.btn.primary{ background:var(--ink); color:var(--bg); border-color:var(--ink); }
:root[data-theme="dark"] .btn.primary, @media (prefers-color-scheme:dark){ .btn.primary{ } }
.btn.accent{ background:var(--accent); color:var(--accent-ink); border-color:var(--accent); }
.btn.sm{ padding:8px 14px; font-size:13px; }

/* ===== Sections / eyebrow ===== */
section{ padding:64px 0; }
.eyebrow{ font-family:var(--mono); font-size:11.5px; letter-spacing:.12em; text-transform:uppercase; color:var(--accent); margin-bottom:10px; display:flex; align-items:center; gap:8px; }
.eyebrow::before{ content:''; width:16px; height:1px; background:var(--accent); }
h2.h-section{ font-size:clamp(26px,2.6vw,38px); }
.section-lede{ color:var(--ink-muted); font-size:15.5px; max-width:60ch; margin-top:12px; }

/* ===== Cards / grids ===== */
.grid{ display:grid; gap:18px; }
.grid-2{ grid-template-columns:1fr 1fr; }
.grid-3{ grid-template-columns:repeat(3,1fr); }
.grid-4{ grid-template-columns:repeat(4,1fr); }
@media (max-width: 920px){ .grid-2,.grid-3,.grid-4{ grid-template-columns:1fr; } }
@media (min-width:640px) and (max-width:920px){ .grid-3,.grid-4{ grid-template-columns:1fr 1fr; } }

.card{
  background:var(--bg-raised); border:1px solid var(--line); border-radius:var(--radius);
  padding:24px; box-shadow:var(--shadow-sm);
  transition:transform .22s var(--ease), box-shadow .22s var(--ease), border-color .22s var(--ease);
}
a.card:hover, .card.hoverable:hover{ transform:translateY(-3px); box-shadow:var(--shadow); border-color:var(--ink-faint); }

.chip{ display:inline-flex; align-items:center; gap:6px; font-family:var(--mono); font-size:11.5px; padding:5px 11px; border-radius:999px; background:var(--bg-sunken); border:1px solid var(--line); color:var(--ink-muted); }
.chip.accent{ color:var(--accent); background:var(--accent-soft); border-color:transparent; }
.chip.good{ color:var(--good); background:var(--good-soft); border-color:transparent; }
.chiprow{ display:flex; flex-wrap:wrap; gap:8px; }

/* ===== Hero ===== */
.hero{ padding:76px 0 40px; }
.hero-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:44px; align-items:center; }
.hero h1{ font-size:clamp(38px,5.4vw,64px); line-height:1.03; }
.hero h1 .accent-word{ color:var(--accent); }
.hero .role{ font-family:var(--mono); font-size:13px; letter-spacing:.03em; color:var(--ink-muted); margin-top:16px; }
.hero .lede{ color:var(--ink-muted); font-size:clamp(15.5px,1vw+11px,18px); margin-top:14px; max-width:56ch; }
.hero .cta{ display:flex; flex-wrap:wrap; gap:12px; margin-top:26px; }
.portrait-wrap{ border-radius:var(--radius-lg); overflow:hidden; border:1px solid var(--line); box-shadow:var(--shadow); aspect-ratio:4/5; }
.portrait-wrap img{ width:100%; height:100%; object-fit:cover; }
.now-badge{ display:inline-flex; align-items:center; gap:8px; font-family:var(--mono); font-size:12px; color:var(--ink-muted); background:var(--bg-sunken); border:1px solid var(--line); padding:6px 12px; border-radius:999px; margin-top:22px; }
.now-badge .pulse{ width:7px; height:7px; border-radius:999px; background:var(--good); position:relative; }
.now-badge .pulse::after{ content:''; position:absolute; inset:-4px; border-radius:999px; border:1px solid var(--good); animation:pulse 2.2s var(--ease) infinite; }
@keyframes pulse{ 0%{ transform:scale(.7); opacity:.9;} 100%{ transform:scale(1.8); opacity:0;} }
@media (max-width:920px){ .hero-grid{ grid-template-columns:1fr; } .hero{ padding-top:44px; } }

/* ===== Stat / score tiles ===== */
.stat-row{ display:grid; grid-template-columns:repeat(4,1fr); gap:14px; }
@media (max-width:760px){ .stat-row{ grid-template-columns:1fr 1fr; } }
.stat-tile{ background:var(--bg-raised); border:1px solid var(--line); border-radius:var(--radius); padding:18px 20px; box-shadow:var(--shadow-sm); }
.stat-tile .num{ font-family:var(--mono); font-weight:700; font-size:26px; font-variant-numeric:tabular-nums; color:var(--accent); }
.stat-tile .lbl{ font-size:12.5px; color:var(--ink-muted); margin-top:4px; font-weight:600; }

/* ===== Timeline ===== */
.timeline{ position:relative; padding-left:28px; }
.timeline::before{ content:''; position:absolute; left:6px; top:6px; bottom:6px; width:2px; background:var(--line); }
.tl-item{ position:relative; padding-bottom:34px; }
.tl-item:last-child{ padding-bottom:0; }
.tl-item::before{ content:''; position:absolute; left:-28px; top:4px; width:13px; height:13px; border-radius:999px; background:var(--bg); border:2px solid var(--accent); }
.tl-item .when{ font-family:var(--mono); font-size:12px; color:var(--ink-faint); }
.tl-item h3{ font-size:16.5px; margin-top:4px; }
.tl-item p{ font-size:14px; color:var(--ink-muted); margin-top:6px; }

/* ===== Case-study anatomy ===== */
.cs-hero{ padding:56px 0 30px; border-bottom:1px solid var(--line); }
.cs-kicker{ font-family:var(--mono); font-size:12px; color:var(--accent); letter-spacing:.08em; text-transform:uppercase; margin-bottom:10px; }
.cs-meta{ display:flex; gap:18px; flex-wrap:wrap; margin-top:16px; font-size:13.5px; color:var(--ink-muted); }
.cs-meta b{ color:var(--ink); font-weight:700; }
.cs-body{ display:grid; grid-template-columns:180px minmax(0,1fr); gap:48px; padding:44px 0; }
.cs-rail{ position:sticky; top:84px; align-self:start; display:flex; flex-direction:column; gap:2px; }
.cs-rail a{ font-size:12.5px; font-weight:600; color:var(--ink-faint); padding:6px 0; border-left:2px solid transparent; padding-left:12px; transition:color .15s, border-color .15s; }
.cs-rail a:hover, .cs-rail a.active{ color:var(--ink); border-color:var(--accent); }
.cs-section{ padding-bottom:46px; margin-bottom:46px; border-bottom:1px solid var(--line-soft); scroll-margin-top:90px; }
.cs-section:last-child{ border-bottom:none; margin-bottom:0; }
.cs-section h2{ font-size:22px; }
.cs-section p{ font-size:15.5px; color:var(--ink); margin-top:14px; }
@media (max-width:900px){ .cs-body{ grid-template-columns:1fr; } .cs-rail{ position:static; flex-direction:row; overflow-x:auto; gap:14px; padding-bottom:10px; } }

/* ===== Diagram (hoverable architecture) ===== */
.diagram{ background:var(--bg-sunken); border:1px solid var(--line); border-radius:var(--radius); padding:28px; margin-top:18px; overflow-x:auto; }
.diagram .flow{ display:flex; align-items:center; gap:10px; min-width:max-content; }
.dnode{ position:relative; background:var(--bg-raised); border:1px solid var(--line); border-radius:var(--radius-sm); padding:12px 16px; font-family:var(--mono); font-size:12.5px; cursor:default; transition:border-color .18s, transform .18s; }
.dnode:hover{ border-color:var(--accent); transform:translateY(-2px); }
.dnode .tip{ position:absolute; left:50%; bottom:calc(100% + 10px); transform:translateX(-50%) translateY(4px); background:var(--ink); color:var(--bg); font-family:var(--sans); font-size:12.5px; padding:9px 12px; border-radius:8px; width:220px; opacity:0; pointer-events:none; transition:opacity .18s, transform .18s; z-index:5; box-shadow:var(--shadow); }
:root[data-theme="dark"] .dnode .tip, @media (prefers-color-scheme:dark){ .dnode .tip{ } }
.dnode:hover .tip{ opacity:1; transform:translateX(-50%) translateY(0); }
.darrow{ color:var(--ink-faint); font-size:16px; flex:none; }

/* ===== Footer ===== */
footer.site{ border-top:1px solid var(--line); padding:36px 0 44px; margin-top:40px; }
.footgrid{ display:flex; justify-content:space-between; align-items:center; gap:16px; flex-wrap:wrap; font-size:13px; color:var(--ink-muted); }
.footgrid a{ color:var(--ink-muted); }
.footgrid a:hover{ color:var(--ink); }
.badge-row{ display:flex; gap:8px; flex-wrap:wrap; }

/* ===== Reveal-on-scroll =====
   Content is visible by default (opacity:1) so it never depends on JS,
   scroll position, or a full-page capture tool to be readable — the
   IntersectionObserver only adds a subtle slide-up polish on top. */
.reveal{ opacity:1; transform:translateY(10px); transition:transform .5s var(--ease); }
.reveal.in{ transform:none; }

/* ===== Command palette ===== */
.cmdk-backdrop{ position:fixed; inset:0; background:rgba(10,12,12,.5); backdrop-filter:blur(2px); z-index:200; display:none; align-items:flex-start; justify-content:center; padding-top:14vh; }
.cmdk-backdrop.open{ display:flex; }
.cmdk{ width:min(560px,90vw); background:var(--bg-raised); border:1px solid var(--line); border-radius:var(--radius); box-shadow:var(--shadow); overflow:hidden; }
.cmdk input{ width:100%; border:none; background:transparent; padding:18px 20px; font-family:var(--mono); font-size:15px; color:var(--ink); border-bottom:1px solid var(--line); }
.cmdk input:focus{ outline:none; }
.cmdk ul{ max-height:320px; overflow-y:auto; padding:8px; }
.cmdk li{ padding:11px 14px; border-radius:8px; font-size:14px; display:flex; justify-content:space-between; cursor:pointer; }
.cmdk li.sel, .cmdk li:hover{ background:var(--accent-soft); color:var(--accent); }
.cmdk li .k{ font-family:var(--mono); font-size:11px; color:var(--ink-faint); }

/* ===== Misc utilities ===== */
.mt-0{ margin-top:0 !important; }
.text-muted{ color:var(--ink-muted); }
.text-faint{ color:var(--ink-faint); }
.sr-only{ position:absolute !important; height:1px; width:1px; overflow:hidden; clip:rect(1px,1px,1px,1px); white-space:nowrap; border:0; padding:0; margin:-1px; }
.tablewrap{ overflow-x:auto; border:1px solid var(--line); border-radius:var(--radius); background:var(--bg-raised); box-shadow:var(--shadow-sm); }
.tablewrap table{ min-width:560px; font-size:14px; }
.tablewrap th{ font-family:var(--sans); font-size:11px; text-transform:uppercase; letter-spacing:.06em; color:var(--ink-muted); text-align:left; padding:10px 14px; border-bottom:1px solid var(--line); }
.tablewrap td{ padding:11px 14px; border-bottom:1px solid var(--line-soft); vertical-align:top; }
.tablewrap tr:last-child td{ border-bottom:none; }