/* ============ TOKENS ============ */
  :root{
    --bg:#ECF0F3;
    --surface:#FFFFFF;
    --surface-2:#F4F7F9;
    --ink:#16263A;
    --ink-soft:#4B5C70;
    --ink-faint:#7C8CA0;
    --line:#D2DAE1;
    --line-strong:#B7C3CE;

    --accent:#6A3FC0;
    --accent-ink:#FFFFFF;
    --accent-soft:#EFE9FB;

    --critical:#C6392B;
    --critical-bg:#F7E4E1;
    --rising:#A8770C;
    --rising-bg:#F8ECD3;
    --watch:#0B7A9C;
    --watch-bg:#DDEEF3;

    --shadow: 0 1px 2px rgba(22,38,58,.06), 0 8px 24px -12px rgba(22,38,58,.18);

    --font-display:'Big Shoulders Display', 'Oswald', 'Arial Narrow', sans-serif;
    --font-body:'IBM Plex Sans', 'Segoe UI', system-ui, sans-serif;
    --font-mono:'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;
  }

  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --bg:#0E1826;
      --surface:#152134;
      --surface-2:#101B2A;
      --ink:#E7EDF3;
      --ink-soft:#9FB0C2;
      --ink-faint:#6E8098;
      --line:#28394E;
      --line-strong:#37495F;

      --accent:#8A5CE0;
      --accent-ink:#FFFFFF;
      --accent-soft:#241C3B;

      --critical:#E2685A;
      --critical-bg:#332025;
      --rising:#D8A23D;
      --rising-bg:#332918;
      --watch:#3FAFCE;
      --watch-bg:#122C36;

      --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 32px -16px rgba(0,0,0,.55);
    }
  }
  :root[data-theme="dark"]{
    --bg:#0E1826;
    --surface:#152134;
    --surface-2:#101B2A;
    --ink:#E7EDF3;
    --ink-soft:#9FB0C2;
    --ink-faint:#6E8098;
    --line:#28394E;
    --line-strong:#37495F;

    --accent:#8A5CE0;
    --accent-ink:#FFFFFF;
    --accent-soft:#241C3B;

    --critical:#E2685A;
    --critical-bg:#332025;
    --rising:#D8A23D;
    --rising-bg:#332918;
    --watch:#3FAFCE;
    --watch-bg:#122C36;

    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 32px -16px rgba(0,0,0,.55);
  }

  /* ============ BASE ============ */
  *,*::before,*::after{ box-sizing:border-box; }
  html{ scroll-behavior:smooth; }
  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    *,*::before,*::after{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; }
  }
  body{
    margin:0;
    background:var(--bg);
    color:var(--ink);
    font-family:var(--font-body);
    font-size:16.5px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  img,svg{ display:block; max-width:100%; }
  a{ color:inherit; }
  h1,h2,h3{ font-family:var(--font-display); font-weight:800; text-transform:uppercase; letter-spacing:.01em; text-wrap:balance; margin:0; color:var(--ink); }
  p{ margin:0; }
  .container{ max-width:1180px; margin-inline:auto; padding-inline:clamp(20px,5vw,56px); }
  .measure{ max-width:62ch; }
  .eyebrow{
    font-family:var(--font-mono);
    font-size:.78rem;
    font-weight:500;
    letter-spacing:.14em;
    text-transform:uppercase;
    color:var(--accent);
    display:flex;
    align-items:center;
    gap:.6em;
  }
  .eyebrow::before{
    content:"";
    width:7px;height:7px;
    background:var(--accent);
    display:inline-block;
    border-radius:1px;
    transform:rotate(45deg);
    flex:none;
  }
  .num{ font-family:var(--font-mono); font-variant-numeric:tabular-nums; }
  section{ position:relative; }
  ::selection{ background:var(--accent-soft); color:var(--ink); }
  :focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:2px; }

  /* ============ NAV ============ */
  .nav{
    position:sticky; top:0; z-index:40;
    background:color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .nav-row{ display:flex; align-items:center; justify-content:space-between; padding-block:16px; }
  .brand{ display:flex; align-items:center; gap:10px; text-decoration:none; }
  .brand-mark{ width:26px; height:30px; flex:none; }
  .brand-word{ font-family:var(--font-display); font-weight:800; font-size:1.25rem; letter-spacing:.03em; }
  .nav-links{ display:flex; align-items:center; gap:clamp(16px,3vw,32px); }
  .nav-links a:not(.cta-link){ text-decoration:none; font-size:.92rem; color:var(--ink-soft); }
  .nav-links a:not(.cta-link):hover{ color:var(--ink); }
  .nav-links a.cta-link{ text-decoration:none; padding-block:.6em; }
  @media (max-width:720px){ .nav-links a:not(.cta-link){ display:none; } }

  /* ============ BUTTONS ============ */
  .btn{
    display:inline-flex; align-items:center; gap:.55em;
    font-family:var(--font-mono); font-size:.86rem; font-weight:500;
    letter-spacing:.03em;
    padding:.85em 1.4em;
    border-radius:3px;
    text-decoration:none;
    border:1px solid transparent;
    cursor:pointer;
    transition:transform .15s ease, background .15s ease, border-color .15s ease;
    white-space:nowrap;
  }
  .btn:hover{ transform:translateY(-1px); }
  .btn-primary{ background:var(--accent); color:var(--accent-ink); }
  .btn-primary:hover{ background:color-mix(in srgb, var(--accent) 88%, black 6%); }
  .btn-ghost{ background:transparent; color:var(--ink); border-color:var(--line-strong); }
  .btn-ghost:hover{ border-color:var(--accent); color:var(--accent); }
  .btn-arrow{ transition:transform .15s ease; }
  .btn:hover .btn-arrow{ transform:translateX(3px); }

  /* ============ HERO ============ */
  .hero{ padding-block:clamp(56px,9vw,108px) clamp(48px,7vw,88px); overflow:hidden; }
  .hero-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:clamp(32px,5vw,64px); align-items:center; }
  @media (max-width:900px){ .hero-grid{ grid-template-columns:1fr; } }
  .hero h1{ font-size:clamp(2.4rem,5.4vw,4.1rem); line-height:.98; margin-block:18px 22px; }
  .hero h1 em{ font-style:normal; color:var(--accent); }
  .hero-sub{ color:var(--ink-soft); font-size:1.08rem; margin-bottom:32px; }
  .hero-actions{ display:flex; flex-wrap:wrap; gap:14px; margin-bottom:44px; }
  .stat-row{ display:flex; gap:clamp(20px,4vw,40px); border-top:1px solid var(--line); padding-top:22px; }
  .stat{ display:flex; flex-direction:column; gap:2px; }
  .stat-num{ font-family:var(--font-mono); font-size:clamp(1.7rem,3vw,2.2rem); font-weight:600; line-height:1; }
  .stat-num.-hi{ color:var(--critical); }
  .stat-num.-lo{ color:var(--watch); }
  .stat-label{ font-size:.8rem; color:var(--ink-faint); max-width:20ch; }

  .hero-diagram{ position:relative; aspect-ratio:1/1.05; }
  .hero-diagram svg{ width:100%; height:100%; }
  .sweep{ transform-origin:170px 170px; animation:sweep 6s linear infinite; }
  @keyframes sweep{ to{ transform:rotate(360deg); } }
  @media (prefers-reduced-motion: reduce){ .sweep{ animation:none; } }
  .node-pulse{ animation:pulse 2.6s ease-in-out infinite; }
  .node-pulse.d2{ animation-delay:.6s; }
  .node-pulse.d3{ animation-delay:1.2s; }
  @keyframes pulse{ 0%,100%{ opacity:.45; } 50%{ opacity:1; } }
  @media (prefers-reduced-motion: reduce){ .node-pulse{ animation:none; opacity:.9; } }

  /* ============ GENERIC SECTION ============ */
  .band{ padding-block:clamp(56px,8vw,96px); border-top:1px solid var(--line); }
  .band.-tint{ background:var(--surface-2); }
  .band-head{ display:grid; grid-template-columns:1.1fr 1.4fr; gap:40px; margin-bottom:48px; }
  @media (max-width:820px){ .band-head{ grid-template-columns:1fr; } }
  .band-head > .eyebrow{ align-self:start; padding-top:6px; }
  .band-head h2{ font-size:clamp(1.7rem,3.4vw,2.5rem); line-height:1.05; margin-bottom:16px; }
  .band-head p{ color:var(--ink-soft); }

  .pullquote{
    font-family:var(--font-mono);
    font-size:1.05rem;
    color:var(--ink);
    background:var(--surface);
    border:1px solid var(--line);
    border-left:3px solid var(--accent);
    padding:20px 24px;
    border-radius:2px;
    margin-block:28px;
  }
  .pullquote cite{ display:block; font-style:normal; color:var(--ink-faint); font-size:.8rem; margin-top:10px; }

  .inline-stats{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:4px; overflow:hidden; margin-top:36px; }
  .inline-stats.-tight{ margin-top:26px; margin-bottom:32px; }
  .inline-stats > div{ background:var(--surface); padding:18px 16px; }
  .inline-stats .n{ font-family:var(--font-mono); font-size:1.5rem; font-weight:600; }
  .inline-stats .l{ font-size:.78rem; color:var(--ink-faint); margin-top:4px; }

  /* ============ METHOD CARDS ============ */
  .method-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); border-radius:4px; overflow:hidden; }
  .method-card{ background:var(--surface); padding:26px 24px; display:flex; flex-direction:column; gap:10px; }
  .method-index{ font-family:var(--font-mono); font-size:.78rem; color:var(--ink-faint); }
  .method-card h3{ font-family:var(--font-body); text-transform:none; font-weight:600; font-size:1.02rem; letter-spacing:0; }
  .method-card p{ color:var(--ink-soft); font-size:.92rem; }
  .method-card .example{ font-family:var(--font-mono); font-size:.8rem; color:var(--accent); margin-top:auto; padding-top:10px; border-top:1px dashed var(--line); }

  /* ============ TABS ============ */
  .tabs{ display:flex; gap:4px; border-bottom:1px solid var(--line); margin-bottom:30px; flex-wrap:wrap; }
  .tab{
    appearance:none; background:transparent; border:none;
    font-family:var(--font-display); text-transform:uppercase;
    font-size:1.15rem; font-weight:700; letter-spacing:.02em;
    color:var(--ink-faint);
    padding:10px 18px 12px 0; margin-right:18px;
    cursor:pointer;
    border-bottom:2px solid transparent;
    margin-bottom:-1px;
    display:flex; align-items:baseline; gap:.6em;
    transition:color .15s ease, border-color .15s ease;
  }
  .tab:hover{ color:var(--ink-soft); }
  .tab[aria-selected="true"]{ color:var(--ink); border-bottom-color:var(--accent); }
  .tab-sub{
    font-family:var(--font-mono); font-size:.7rem; font-weight:400;
    letter-spacing:.08em; text-transform:uppercase; color:var(--ink-faint);
  }
  .tab[aria-selected="true"] .tab-sub{ color:var(--accent); }
  .tab-panel[hidden]{ display:none; }

  .track-thesis{
    font-size:1.02rem; color:var(--ink-soft); max-width:64ch; margin-bottom:6px;
  }
  .track-thesis strong{ color:var(--ink); }

  /* ============ RADAR LIST ============ */
  .legend{ display:flex; flex-wrap:wrap; gap:22px; margin-bottom:26px; }
  .legend-item{ display:flex; align-items:center; gap:8px; font-size:.85rem; color:var(--ink-soft); }
  .chip{
    font-family:var(--font-mono); font-size:.72rem; font-weight:600; letter-spacing:.04em;
    padding:.3em .65em; border-radius:2px; text-transform:uppercase; white-space:nowrap;
  }
  .chip.-critical{ color:var(--critical); background:var(--critical-bg); }
  .chip.-rising{ color:var(--rising); background:var(--rising-bg); }
  .chip.-watch{ color:var(--watch); background:var(--watch-bg); }

  .radar-list{ border-top:1px solid var(--line); }
  .radar-row{
    display:grid;
    grid-template-columns:110px 1.1fr 1.4fr auto;
    gap:20px;
    align-items:center;
    padding:18px 4px;
    border-bottom:1px solid var(--line);
    transition:background .15s ease;
  }
  .radar-row:hover{ background:var(--surface-2); }
  @media (max-width:760px){
    .radar-row{ grid-template-columns:1fr; row-gap:6px; padding-block:16px; }
    .radar-row .rr-figure{ order:3; }
  }
  .rr-name{ font-weight:600; }
  .rr-note{ color:var(--ink-soft); font-size:.9rem; }
  .rr-figure{ font-family:var(--font-mono); font-weight:600; text-align:right; font-size:.95rem; }
  .rr-figure span{ display:block; font-size:.72rem; color:var(--ink-faint); font-weight:400; }
  @media (max-width:760px){ .rr-figure{ text-align:left; } }

  .radar-foot{ margin-top:22px; font-size:.82rem; color:var(--ink-faint); }

  /* ============ SERVICES ============ */
  .service-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
  @media (max-width:900px){ .service-grid{ grid-template-columns:1fr; } }
  .service-card{ background:var(--surface); border:1px solid var(--line); border-radius:4px; padding:28px 26px; display:flex; flex-direction:column; gap:14px; }
  .service-tag{ font-family:var(--font-mono); font-size:.72rem; color:var(--ink-faint); letter-spacing:.08em; text-transform:uppercase; }
  .service-card h3{ font-family:var(--font-display); text-transform:none; font-size:1.3rem; letter-spacing:0; }
  .service-card p{ color:var(--ink-soft); font-size:.92rem; flex:1; }
  .service-card ul{ margin:0; padding-left:1.1em; color:var(--ink-soft); font-size:.88rem; display:flex; flex-direction:column; gap:6px; }

  /* ============ ABOUT ============ */
  .about-grid{ display:grid; grid-template-columns:.9fr 1.5fr; gap:48px; align-items:start; }
  @media (max-width:820px){ .about-grid{ grid-template-columns:1fr; } }
  .about-card{ background:var(--surface); border:1px solid var(--line); border-radius:4px; padding:22px; }
  .about-card .name{ font-family:var(--font-display); font-size:1.3rem; }
  .about-card .role{ font-family:var(--font-mono); font-size:.78rem; color:var(--ink-faint); margin-top:4px; }
  .about-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-top:16px; }
  .about-tags span{ font-family:var(--font-mono); font-size:.72rem; border:1px solid var(--line-strong); padding:.3em .6em; border-radius:2px; color:var(--ink-soft); }
  .about-copy p + p{ margin-top:16px; }
  .about-copy{ color:var(--ink-soft); }
  .about-copy strong{ color:var(--ink); }
  .name-note{
    margin-top:26px; padding:20px 22px;
    background:var(--surface); border:1px solid var(--line);
    border-left:3px solid var(--accent); border-radius:3px;
    display:flex; flex-direction:column; gap:12px;
  }
  .name-note .tamil{
    font-family:'Noto Sans Tamil', serif;
    font-size:1.45rem; line-height:1.4; color:var(--accent);
  }
  .name-note p{ font-size:.93rem; }

  /* ============ FINAL CTA ============ */
  .final{ text-align:left; padding-block:clamp(64px,9vw,110px); }
  .final h2{ font-size:clamp(2rem,4.6vw,3.2rem); max-width:16ch; }
  .final-row{ display:flex; flex-wrap:wrap; justify-content:space-between; align-items:end; gap:28px; margin-top:28px; }
  .final-meta{ color:var(--ink-soft); font-size:.95rem; max-width:38ch; }

  /* ============ FOOTER ============ */
  footer{ border-top:1px solid var(--line); padding-block:26px; }
  .foot-row{ display:flex; flex-wrap:wrap; justify-content:space-between; gap:12px; font-size:.82rem; color:var(--ink-faint); font-family:var(--font-mono); }
  footer a{ color:var(--ink-soft); text-decoration:none; }
  footer a:hover{ color:var(--accent); }