/* ── Spark design system ─────────────────────────────────────────────── */
:root{
  --bg:#08080b; --bg2:#0d0d12; --panel:#111118; --panel2:#16161f;
  --line:#23232e; --line2:#2e2e3c;
  --txt:#f2f2f7; --mut:#8b8b9a; --dim:#5c5c6b;
  --sp1:#7c5cff; --sp2:#00d4ff; --amber:#ffb545;
  --grad:linear-gradient(120deg,var(--sp1),var(--sp2));
  --r:14px; --r-lg:20px;
  --sans:'Inter',-apple-system,'Segoe UI',Roboto,Arial,sans-serif;
  --serif:'Instrument Serif',Georgia,'Times New Roman',serif;
  --mono:'JetBrains Mono',ui-monospace,'Cascadia Code',Consolas,monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--txt);font-family:var(--sans);font-size:15px;line-height:1.6;
  -webkit-font-smoothing:antialiased;min-height:100dvh}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,textarea,select{font-family:inherit;font-size:16px;color:var(--txt);background:var(--panel);
  border:1px solid var(--line);border-radius:var(--r);outline:none}
input:focus,textarea:focus,select:focus{border-color:var(--sp1)}
::selection{background:rgba(124,92,255,.35)}
::-webkit-scrollbar{width:9px;height:9px}
::-webkit-scrollbar-thumb{background:#26262f;border-radius:8px;border:2px solid var(--bg)}
::-webkit-scrollbar-thumb:hover{background:#33333f}
::-webkit-scrollbar-track{background:transparent}

/* spotlight hero backdrop */
.beam{position:fixed;inset:0;z-index:-1;background:
  radial-gradient(900px 480px at 50% -8%,rgba(124,92,255,.16),transparent 60%),
  radial-gradient(700px 380px at 62% -6%,rgba(0,212,255,.10),transparent 60%),
  var(--bg)}

/* buttons */
.sbtn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:999px;
  font-weight:600;font-size:14px;transition:.18s;white-space:nowrap}
.sbtn.primary{background:var(--grad);color:#fff;box-shadow:0 4px 24px rgba(124,92,255,.35)}
.sbtn.primary:hover{transform:translateY(-1px);box-shadow:0 8px 32px rgba(124,92,255,.5)}
.sbtn.ghost{border:1px solid var(--line2);color:var(--txt);background:rgba(255,255,255,.02)}
.sbtn.ghost:hover{border-color:var(--sp1);background:rgba(124,92,255,.08)}
.sbtn.danger{border:1px solid #5c2530;color:#ff7a8a}
.sbtn.danger:hover{background:rgba(255,80,100,.08)}
.sbtn:disabled{opacity:.45;pointer-events:none}
.sbtn.sm{padding:6px 13px;font-size:13px}

/* pills / chips */
.pill{display:inline-flex;align-items:center;gap:7px;padding:7px 14px;border-radius:999px;
  border:1px solid var(--line);background:var(--panel);font-size:13px;color:var(--mut);
  cursor:pointer;transition:.16s;white-space:nowrap}
.pill:hover{border-color:var(--sp1);color:var(--txt)}
.pill.on{border-color:var(--sp1);color:var(--txt);background:rgba(124,92,255,.12)}
.badge{font-size:10px;font-weight:700;letter-spacing:.06em;padding:3px 8px;border-radius:999px;
  background:var(--grad);color:#fff;text-transform:uppercase}

/* cards */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;
  transition:.2s}
.card.hover:hover{transform:translateY(-3px);border-color:var(--line2);
  box-shadow:0 16px 48px rgba(0,0,0,.45)}

/* nav (marketing pages) */
.snav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:26px;
  padding:14px 28px;background:rgba(8,8,11,.72);backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(255,255,255,.05)}
.snav .brand{display:flex;align-items:center;gap:9px;font-weight:800;font-size:20px;letter-spacing:-.02em}
.snav .brand .bolt{width:26px;height:26px;border-radius:8px;background:var(--grad);display:grid;
  place-items:center;font-size:15px;color:#fff}
.snav .links{display:flex;gap:20px;font-size:14px;color:var(--mut)}
.snav .links a{display:flex;align-items:center;gap:6px;padding:6px 4px;transition:.15s}
.snav .links a:hover,.snav .links a.on{color:var(--txt)}
.snav .spacer{flex:1}
@media(max-width:820px){.snav{gap:14px;padding:12px 16px}.snav .links{display:none}}

/* dropdown menus (model picker, versions…) */
.dropdown{position:relative}
.dd-menu{position:absolute;top:calc(100% + 8px);right:0;background:var(--panel);border:1px solid var(--line2);
  border-radius:14px;padding:7px;min-width:252px;display:none;z-index:80;box-shadow:0 18px 48px rgba(0,0,0,.55)}
.dd-menu.show{display:block}
.dd-item{display:flex;flex-direction:column;gap:2px;padding:10px 12px;border-radius:10px;cursor:pointer;font-size:13.5px}
.dd-item:hover{background:var(--panel2)}
.dd-item.lock{opacity:.42;cursor:not-allowed}
.dd-item.sel{background:rgba(124,92,255,.13)}
.dd-item .dsc{color:var(--mut);font-size:12px}

/* toast */
.toast{position:fixed;left:50%;bottom:26px;transform:translateX(-50%) translateY(80px);
  background:#1a1a24;border:1px solid var(--line2);border-radius:12px;padding:11px 20px;
  font-size:14px;z-index:400;opacity:0;transition:.25s;pointer-events:none;max-width:88vw}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
.toast.err{border-color:#5c2530;color:#ff8a97}

/* modal */
.smodal-ov{position:fixed;inset:0;background:rgba(0,0,0,.6);backdrop-filter:blur(6px);z-index:300;
  display:none;align-items:center;justify-content:center;padding:18px}
.smodal-ov.show{display:flex}
.smodal{background:var(--panel);border:1px solid var(--line2);border-radius:var(--r-lg);
  padding:26px;width:100%;max-width:460px;max-height:88dvh;overflow:auto}
.smodal h3{font-size:19px;margin-bottom:6px}
.smodal .sub{color:var(--mut);font-size:13.5px;margin-bottom:18px}

/* util */
.mut{color:var(--mut)} .dim{color:var(--dim)}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.serif{font-family:var(--serif)} .mono{font-family:var(--mono)}
.spin{width:16px;height:16px;border:2px solid rgba(255,255,255,.25);border-top-color:#fff;
  border-radius:50%;animation:spr .7s linear infinite;display:inline-block;vertical-align:-3px}
@keyframes spr{to{transform:rotate(360deg)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.fade-up{animation:fadeUp .5s ease both}