/* =========================================================================
   data-science.pauldiop.com — design system
   Dark, high-contrast, Linear/Stripe-inspired. Mobile-first.
   ========================================================================= */
:root{
  --bg:#07080d;
  --bg-2:#0c0e16;
  --surface:rgba(255,255,255,.035);
  --surface-2:rgba(255,255,255,.06);
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.16);
  --fg:#eef1f8;
  --fg-2:#a8b0c4;
  --fg-3:#7b8497;
  --blue:#4c8dff;
  --violet:#a06bff;
  --amber:#ffb648;
  --green:#4ade9b;
  --radius:18px;
  --radius-sm:12px;
  --shadow:0 24px 60px -20px rgba(0,0,0,.75);
  --maxw:1180px;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--fg);
  font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  font-size:16px;line-height:1.62;-webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0 0 .5em;line-height:1.15;letter-spacing:-.02em;font-weight:700}
h1{font-size:clamp(2.3rem,6vw,4.1rem);font-weight:800;letter-spacing:-.035em}
h2{font-size:clamp(1.6rem,3.4vw,2.4rem);letter-spacing:-.03em}
h3{font-size:1.08rem;font-weight:650}
p{margin:0 0 1em}
.mono{font-family:var(--mono);font-size:.78rem;color:var(--fg-3)}
.small{font-size:.72rem}
.small-btn{padding:.5rem .9rem!important;font-size:.82rem!important}

/* ---------- background mesh ---------- */
.mesh{position:fixed;inset:0;z-index:-1;overflow:hidden;pointer-events:none}
.mesh::after{ /* subtle grid */
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 100% 60% at 50% 0%,#000 20%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 100% 60% at 50% 0%,#000 20%,transparent 75%);
}
.blob{position:absolute;border-radius:50%;filter:blur(90px);opacity:.5}
.b1{width:52vw;height:52vw;left:-12vw;top:-18vw;background:radial-gradient(circle at 30% 30%,#2b5cff,transparent 65%)}
.b2{width:44vw;height:44vw;right:-10vw;top:2vw;background:radial-gradient(circle at 60% 40%,#8b3dff,transparent 65%);opacity:.42}
.b3{width:40vw;height:40vw;left:28vw;top:38vw;background:radial-gradient(circle at 50% 50%,#ff9b2f,transparent 65%);opacity:.2}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:50;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:14px clamp(16px,4vw,40px);
  background:rgba(7,8,13,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:-.02em;font-size:.95rem}
.brand em{font-style:normal;color:var(--fg-3);font-weight:500}
.brand-dot{width:9px;height:9px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--violet));box-shadow:0 0 14px rgba(76,141,255,.8)}
.nav nav{display:flex;align-items:center;gap:clamp(10px,2vw,26px);font-size:.88rem;color:var(--fg-2)}
.nav nav a:hover{color:var(--fg)}
.nav-cta{border:1px solid var(--line-2);padding:7px 13px;border-radius:999px}
.nav-cta:hover{border-color:var(--blue);color:#fff!important;background:rgba(76,141,255,.14)}
@media(max-width:760px){.nav nav a:not(.nav-cta){display:none}}

/* ---------- layout ---------- */
main{max-width:var(--maxw);margin:0 auto;padding:0 clamp(16px,4vw,40px)}
.section{padding:clamp(52px,8vw,104px) 0 0}
.kicker{
  font-family:var(--mono);font-size:.74rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--blue);margin:0 0 .7em
}
.section-lead{max-width:74ch;color:var(--fg-2);font-size:1.03rem}
.section-lead strong{color:var(--fg)}
.grid{display:grid;gap:18px}
.cols-2{grid-template-columns:1fr}
.cols-3{grid-template-columns:1fr}
@media(min-width:880px){.cols-2{grid-template-columns:1fr 1fr}.cols-3{grid-template-columns:repeat(3,1fr)}}

/* ---------- hero ---------- */
.hero{padding:clamp(40px,7vw,86px) 0 0}
.hero-grid{display:grid;gap:clamp(24px,4vw,46px);grid-template-columns:1fr;align-items:center}
@media(min-width:1000px){.hero-grid{grid-template-columns:1.08fr .92fr}}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:.75rem;
  letter-spacing:.05em;color:var(--fg-2);border:1px solid var(--line);
  padding:6px 13px;border-radius:999px;background:var(--surface);margin-bottom:22px
}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 0 rgba(74,222,155,.7);animation:pulse 2.4s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(74,222,155,0)}100%{box-shadow:0 0 0 0 rgba(74,222,155,0)}}
.grad{background:linear-gradient(100deg,#68a3ff 0%,#b479ff 45%,#ffc46b 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:clamp(1.02rem,1.6vw,1.2rem);color:var(--fg-2);max-width:56ch}
.lead strong{color:var(--fg);font-weight:600}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:26px 0 34px}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:.78rem 1.25rem;border-radius:999px;
  font-size:.9rem;font-weight:600;border:1px solid transparent;transition:.22s ease;
}
.btn.primary{background:linear-gradient(120deg,var(--blue),var(--violet));color:#fff;box-shadow:0 14px 34px -14px rgba(96,110,255,.9)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 20px 44px -16px rgba(96,110,255,1)}
.btn.ghost{border-color:var(--line-2);color:var(--fg-2);background:var(--surface)}
.btn.ghost:hover{border-color:var(--line-2);color:#fff;background:var(--surface-2)}
.hero-kpis{display:grid;grid-template-columns:1fr 1fr;gap:12px;list-style:none;margin:0;padding:0}
@media(min-width:560px){.hero-kpis{grid-template-columns:repeat(4,1fr)}}
.hero-kpis li{border-left:2px solid var(--line-2);padding-left:12px}
.hero-kpis b{display:block;font-size:1.28rem;font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.hero-kpis span{font-size:.76rem;color:var(--fg-3);line-height:1.35;display:block}

/* ---------- cards ---------- */
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(18px,2.4vw,26px);box-shadow:var(--shadow);backdrop-filter:blur(8px);
  transition:.25s ease;position:relative;overflow:hidden;
}
.card:hover{border-color:var(--line-2);transform:translateY(-3px)}
.card h3{margin-bottom:.55em}
.card p{color:var(--fg-2);font-size:.94rem;margin-bottom:.6em}
.card p:last-child{margin-bottom:0}
.card .ico{font-size:1.6rem;margin-bottom:12px}
.card-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:14px}
.card-head h3{margin:0}
.card-foot{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-top:12px;font-size:.72rem;color:var(--fg-3)}
.tag{font-family:var(--mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;color:var(--fg-2);
  border:1px solid var(--line);border-radius:999px;padding:4px 10px;background:rgba(255,255,255,.03);white-space:nowrap}
.note{font-size:.8rem;color:var(--fg-3);margin:12px 0 0}
.note strong{color:var(--fg-2)}
.mini h3{font-size:.98rem}
.mini p{font-size:.88rem}
.dot{position:absolute;top:18px;right:18px;width:9px;height:9px;border-radius:50%}
.dot.blue{background:var(--blue)}.dot.amber{background:var(--amber)}
.dot.violet{background:var(--violet)}.dot.green{background:var(--green)}
.hero-card{
  background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid var(--line-2);border-radius:var(--radius);padding:20px;
  box-shadow:0 40px 90px -40px rgba(0,0,0,.95);backdrop-filter:blur(12px);
}
.hero-card canvas{width:100%;height:220px!important;display:block}
.chart-card canvas{width:100%!important;height:280px!important;display:block}
@media(max-width:640px){.chart-card canvas{height:240px!important}.hero-card canvas{height:190px!important}}
.chips{display:flex;gap:6px;flex-wrap:wrap}
.chip{font-size:.72rem;padding:5px 11px;border-radius:999px;border:1px solid var(--line);
  background:transparent;color:var(--fg-2);cursor:pointer;transition:.2s}
.chip:hover{border-color:var(--line-2);color:#fff}
.chip.on{background:rgba(76,141,255,.16);border-color:rgba(76,141,255,.55);color:#fff}

/* ---------- table ---------- */
table.kv{width:100%;border-collapse:collapse;font-size:.87rem}
table.kv td{padding:9px 0;border-bottom:1px solid var(--line)}
table.kv td:last-child{text-align:right;font-variant-numeric:tabular-nums;font-weight:600;color:#fff}
table.kv td:first-child{color:var(--fg-2)}
table.kv tr:last-child td{border-bottom:none}
table.kv tr.hi td:last-child{color:var(--green)}

/* ---------- footer ---------- */
footer{max-width:var(--maxw);margin:clamp(60px,9vw,120px) auto 0;padding:34px clamp(16px,4vw,40px) 60px;border-top:1px solid var(--line)}
.foot-grid{display:grid;gap:26px;grid-template-columns:1fr}
@media(min-width:760px){.foot-grid{grid-template-columns:1.4fr 1fr 1fr}}
footer h4{font-size:.82rem;font-family:var(--mono);text-transform:uppercase;letter-spacing:.1em;color:var(--fg-3)}
footer p,footer a{font-size:.87rem;color:var(--fg-2)}
footer a{display:block;margin-bottom:7px}
footer a:hover{color:#fff}
.foot-note{font-size:.78rem;color:var(--fg-3);margin-top:30px;max-width:80ch}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(18px)}
.reveal.in{opacity:1;transform:none;transition:opacity .7s ease,transform .7s cubic-bezier(.16,1,.3,1)}