/* DataChat — design system v2. Premium, épuré, interactif. */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap');

:root{
  --bg:#FFFFFF;
  --bg-soft:#F7F8FA;
  --ink:#0A0C12;
  --ink-2:#3C434F;
  --muted:#737A86;
  --faint:#A6ACB6;
  --line:#ECEEF1;
  --line-2:#E2E5EA;
  --accent:#4F46E5;
  --accent-2:#7C6FF0;
  --accent-d:#3F37C9;
  --accent-soft:#F0F0FE;
  --teal:#0EA5A0;
  --pink:#EC4899;
  --amber:#F59E0B;
  --green:#10B981;
  --red:#EF4444;
  --radius:16px;
  --radius-sm:10px;
  --sh-1:0 1px 2px rgba(10,12,18,.05);
  --sh-2:0 6px 20px rgba(10,12,18,.07);
  --sh-3:0 24px 60px -12px rgba(31,28,90,.22);
  --maxw:1080px;
  --font:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  --mono:ui-monospace,'SFMono-Regular','JetBrains Mono',Menlo,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;
  font-size:16px;line-height:1.6}
a{color:inherit;text-decoration:none}
.tnum{font-variant-numeric:tabular-nums}
.mono{font-family:var(--mono)}
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.center{text-align:center}
h1,h2,h3{letter-spacing:-.025em;line-height:1.08;font-weight:800}
h1{font-size:clamp(38px,6vw,64px);font-weight:900;letter-spacing:-.035em}
h2{font-size:clamp(28px,4vw,42px)}
h3{font-size:19px;letter-spacing:-.01em}
.lead{font-size:clamp(17px,1.6vw,20px);color:var(--ink-2);line-height:1.55}
.muted{color:var(--muted)}
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--accent)}
.gradient-text{background:linear-gradient(105deg,var(--accent),var(--teal));-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border-radius:11px;
  font-family:inherit;font-size:15px;font-weight:600;cursor:pointer;border:1px solid transparent;
  transition:transform .14s ease,box-shadow .14s ease,background .14s ease,border-color .14s}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 6px 16px -4px rgba(79,70,229,.5)}
.btn-primary:hover{background:var(--accent-d);box-shadow:0 10px 24px -6px rgba(79,70,229,.55);transform:translateY(-1px)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{border-color:var(--ink-2);transform:translateY(-1px);box-shadow:var(--sh-2)}
.btn-lg{height:52px;padding:0 28px;font-size:16px}
.btn-sm{height:40px;padding:0 16px;font-size:14px}

/* Badge */
.badge{display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 14px;border-radius:999px;
  font-size:13px;font-weight:600;background:#fff;border:1px solid var(--line-2);box-shadow:var(--sh-1)}
.badge .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(16,185,129,.18)}

/* Nav */
.nav{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.72);backdrop-filter:saturate(180%) blur(16px);
  border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;height:66px;gap:20px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;letter-spacing:-.02em}
.brand .logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--accent),var(--teal));
  display:grid;place-items:center;color:#fff;font-size:15px;font-weight:900;box-shadow:0 4px 10px -2px rgba(79,70,229,.5)}
.nav-links{display:flex;gap:2px;margin-left:14px}
.nav-links a{padding:8px 14px;border-radius:9px;font-size:14.5px;font-weight:500;color:var(--ink-2);transition:.12s}
.nav-links a:hover{background:var(--bg-soft);color:var(--ink)}
.nav-links a.active{color:var(--ink);font-weight:600}
.nav-cta{margin-left:auto;display:flex;align-items:center;gap:10px}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line-2);border-radius:10px;background:#fff;
  cursor:pointer;flex-direction:column;align-items:center;justify-content:center;gap:4px}
.burger span{width:16px;height:2px;background:var(--ink);border-radius:2px}

/* Hero */
.hero{position:relative;overflow:hidden;padding:92px 0 70px}
.hero::before{content:"";position:absolute;inset:0;z-index:0;background:
  radial-gradient(620px 320px at 18% -40px,rgba(124,111,240,.20),transparent 70%),
  radial-gradient(520px 300px at 88% 10%,rgba(14,165,160,.16),transparent 70%)}
.hero::after{content:"";position:absolute;inset:0;z-index:0;opacity:.5;
  background-image:linear-gradient(rgba(10,12,18,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(10,12,18,.035) 1px,transparent 1px);
  background-size:34px 34px;mask-image:radial-gradient(600px 380px at 50% 18%,#000,transparent 75%)}
.hero .container{position:relative;z-index:1}
.hero-top{max-width:760px;margin:0 auto;text-align:center}
.hero h1{margin:20px 0 18px}
.hero .lead{max-width:560px;margin:0 auto}
.hero-cta{display:flex;gap:12px;justify-content:center;margin-top:30px;flex-wrap:wrap}
.hero-proof{display:flex;align-items:center;justify-content:center;gap:11px;margin-top:24px;color:var(--muted);font-size:13.5px}
.avatars{display:flex}
.avatars span{width:30px;height:30px;border-radius:50%;border:2.5px solid #fff;margin-left:-9px;font-size:11px;font-weight:700;
  color:#3a3f4b;display:grid;place-items:center;background:linear-gradient(135deg,#c7d2fe,#99f6e4);box-shadow:var(--sh-1)}
.avatars span:first-child{margin-left:0}

/* Window mockup */
.window{background:#fff;border:1px solid var(--line-2);border-radius:18px;box-shadow:var(--sh-3);overflow:hidden}
.window-bar{display:flex;align-items:center;gap:7px;padding:12px 16px;border-bottom:1px solid var(--line);
  background:linear-gradient(#fff,#fbfbfd)}
.window-bar i{width:11px;height:11px;border-radius:50%;background:#E4E6EB}
.window-bar i:nth-child(1){background:#FF5F57}.window-bar i:nth-child(2){background:#FEBC2E}.window-bar i:nth-child(3){background:#28C840}
.window-bar .t{margin-left:10px;font-size:12px;color:var(--faint);font-weight:500;font-family:var(--mono)}
.hero-window{margin:44px auto 0;max-width:920px}

/* Tabs (product) */
.tabs{display:flex;gap:4px;padding:8px 12px;border-bottom:1px solid var(--line);background:var(--bg-soft)}
.tabs button{height:34px;padding:0 14px;border:none;background:transparent;border-radius:8px;font-family:inherit;
  font-size:13.5px;font-weight:600;color:var(--muted);cursor:pointer;transition:.12s;display:inline-flex;align-items:center;gap:7px}
.tabs button:hover{color:var(--ink)}
.tabs button.on{background:#fff;color:var(--accent);box-shadow:var(--sh-1)}
.view{padding:20px}
.view[hidden]{display:none}

/* KPI */
.kpis{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:18px}
.kpi{border:1px solid var(--line);border-radius:13px;padding:14px;background:linear-gradient(#fff,#fcfcfe)}
.kpi .l{font-size:11.5px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.kpi .v{font-size:23px;font-weight:800;letter-spacing:-.02em;margin-top:5px}
.kpi .d{font-size:11.5px;font-weight:600;margin-top:3px}
.kpi .d.up{color:var(--green)}.kpi .d.down{color:var(--red)}

/* Charts */
.chart-row{display:grid;grid-template-columns:1.6fr 1fr;gap:14px}
.panel{border:1px solid var(--line);border-radius:13px;padding:16px;background:#fff}
.panel .h{font-size:13px;font-weight:700;margin-bottom:14px;display:flex;justify-content:space-between;align-items:center}
.bars{display:flex;align-items:flex-end;gap:9px;height:150px}
.bars .b{flex:1;border-radius:6px 6px 0 0;background:linear-gradient(var(--accent),var(--accent-2));position:relative;
  height:0;transition:height .9s cubic-bezier(.2,.7,.2,1)}
.bars .b.t{background:linear-gradient(var(--teal),#5eddd6)}
.bars-x{display:flex;gap:9px;margin-top:7px}
.bars-x span{flex:1;text-align:center;font-size:10.5px;color:var(--faint)}
.donut{width:140px;height:140px;border-radius:50%;margin:6px auto 0;
  background:conic-gradient(var(--accent) 0 var(--p1,62%),var(--teal) var(--p1,62%) var(--p2,84%),#E7E9EF var(--p2,84%) 100%);
  display:grid;place-items:center;transition:--p1 .9s}
.donut::after{content:"";width:88px;height:88px;border-radius:50%;background:#fff}
.donut-c{position:absolute;font-size:18px;font-weight:800}
.legend{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.legend div{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--ink-2)}
.legend i{width:9px;height:9px;border-radius:3px}

/* Insights */
.ins{border:1px solid var(--line);border-radius:12px;margin-bottom:10px;overflow:hidden;background:#fff}
.ins-h{display:flex;align-items:center;gap:12px;padding:13px 14px;cursor:pointer}
.ins-h:hover{background:var(--bg-soft)}
.ins-h .rk{width:24px;height:24px;border-radius:7px;background:var(--accent-soft);color:var(--accent-d);
  display:grid;place-items:center;font-size:12px;font-weight:800;flex:none}
.ins-h .ti{font-size:14px;font-weight:600}
.sev{font-size:10.5px;font-weight:700;padding:3px 9px;border-radius:999px;margin-left:auto}
.sev.high{background:#FEE2E2;color:#B91C1C}.sev.med{background:#FEF3C7;color:#B45309}.sev.low{background:#D1FAE5;color:#047857}
.ins .chev{color:var(--faint);transition:.2s}.ins.open .chev{transform:rotate(180deg)}
.ins-d{max-height:0;overflow:hidden;transition:max-height .3s ease}
.ins.open .ins-d{max-height:200px}
.ins-d p{padding:0 16px 15px 50px;font-size:13px;color:var(--ink-2);line-height:1.6}

/* Chat */
.chat{display:flex;flex-direction:column;height:420px}
.chat-log{flex:1;overflow:auto;display:flex;flex-direction:column;gap:12px;padding:4px 2px}
.msg{max-width:82%;padding:11px 14px;border-radius:14px;font-size:14px;line-height:1.55}
.msg.u{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:5px}
.msg.a{align-self:flex-start;background:var(--bg-soft);border:1px solid var(--line);border-bottom-left-radius:5px}
.msg.a .fig{margin-top:8px;display:flex;align-items:flex-end;gap:5px;height:42px}
.msg.a .fig b{width:14px;border-radius:3px 3px 0 0;background:linear-gradient(var(--accent),var(--teal))}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}
.chip{border:1px solid var(--line-2);background:#fff;border-radius:999px;padding:7px 13px;font-size:12.5px;
  font-weight:500;color:var(--ink-2);cursor:pointer;transition:.12s}
.chip:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-soft)}
.chat-in{display:flex;gap:8px;align-items:center;border:1px solid var(--line-2);border-radius:12px;padding:5px 5px 5px 14px}
.chat-in input{flex:1;border:none;outline:none;font-family:inherit;font-size:14px;background:transparent}
.cur{display:inline-block;width:2px;height:1em;background:var(--accent);vertical-align:-2px;animation:bk 1s steps(1) infinite}
@keyframes bk{50%{opacity:0}}

/* Run overlay (demo) */
.runline{display:flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12.5px;color:var(--ink-2);
  padding:8px 0;opacity:0;animation:ri .3s forwards}
@keyframes ri{to{opacity:1}}
.spin{widt