/* Delta Arc — corporate site. Single design system. Dark, high-end, minimalist. */
:root{
  --bg:#0a0d13; --bg2:#0c1017; --surface:#111725; --surface2:#0f1420;
  --line:#1e2635; --line2:#2a3547;
  --ink:#eef2f8; --mut:#b6bece; --dim:#8b96a8;
  --brand:#6a9bff; --brand2:#a06bff; --glow:rgba(106,155,255,.25);
  --grad:linear-gradient(120deg,#6a9bff,#a06bff);
  --ok:#3ecf8e; --maxw:1120px;
  --f:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--f);color:var(--ink);background:var(--bg);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}a:hover{color:#fff}
img{max-width:100%}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.grad{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
h1,h2,h3{line-height:1.15;letter-spacing:-.02em;font-weight:800;margin:0 0 .5em}
h1{font-size:clamp(34px,6vw,60px)}h2{font-size:clamp(26px,4vw,40px)}h3{font-size:20px}
p{color:var(--mut);margin:0 0 1em}
.lead{font-size:clamp(17px,2vw,21px);color:#c3ccda;max-width:640px}
.ey{font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--brand);font-weight:700;margin-bottom:14px}
section{padding:84px 0}
.center{text-align:center}.center .lead{margin-left:auto;margin-right:auto}
/* header */
header.nav{position:sticky;top:0;z-index:40;background:rgba(10,13,19,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav .row{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{display:flex;align-items:center;gap:11px;font-weight:800;letter-spacing:-.01em;font-size:18px;color:#fff}
.logo svg{width:30px;height:30px;flex:0 0 auto}
.menu{display:flex;align-items:center;gap:30px}
.menu a{color:var(--mut);font-size:14.5px;font-weight:500}.menu a:hover,.menu a.on{color:#fff}
.btn{display:inline-block;font-weight:700;font-size:14.5px;padding:11px 20px;border-radius:10px;cursor:pointer;border:1px solid transparent;transition:.15s}
.btn.pri{background:var(--grad);color:#0a0d13;box-shadow:0 6px 22px var(--glow)}
.btn.pri:hover{color:#0a0d13;transform:translateY(-1px)}
.btn.gho{border-color:var(--line2);color:var(--ink);background:transparent}
.btn.gho:hover{border-color:var(--brand);color:#fff}
.btn.lg{padding:14px 26px;font-size:16px}
.burger{display:none;background:none;border:0;color:#fff;font-size:24px;cursor:pointer}
@media(max-width:820px){.menu{display:none}.burger{display:block}
  .menu.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;gap:0;background:var(--bg2);border-bottom:1px solid var(--line);padding:8px 0}
  .menu.open a{padding:13px 24px;width:100%}.menu.open .btn{margin:8px 24px}}
/* hero */
.hero{position:relative;overflow:hidden;padding:120px 0 96px;text-align:center;background:#0a0d13 url(../images/hero-bg.jpg) center/cover no-repeat}
.hero::before{content:"";position:absolute;inset:0;pointer-events:none;background:
  radial-gradient(78% 68% at 50% 46%,rgba(10,13,19,.80),rgba(10,13,19,.42) 54%,transparent 80%),
  linear-gradient(180deg,rgba(10,13,19,.55),transparent 22%,rgba(10,13,19,.72))}
.hero .in{position:relative;z-index:1}
.hero h1{max-width:900px;margin:0 auto .28em}
.hero .lead{margin:0 auto 30px}
.cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.mark-lg{width:64px;height:64px;margin:0 auto 26px;display:block}
.trust{margin-top:54px;color:var(--dim);font-size:13px;letter-spacing:.04em}
/* grid cards */
.grid{display:grid;gap:20px}
.g3{grid-template-columns:repeat(3,1fr)}.g2{grid-template-columns:repeat(2,1fr)}.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:1fr 1fr}}
@media(max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:26px}
.card h3{color:#fff}.card .ic{width:44px;height:44px;border-radius:11px;background:linear-gradient(140deg,#182034,#10151f);
  border:1px solid var(--line2);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:16px}
.card p{margin:0;font-size:15px}
/* section band */
.band{background:linear-gradient(180deg,var(--bg),var(--bg2));border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:48px;align-items:center}
@media(max-width:820px){.split{grid-template-columns:1fr;gap:28px}}
.statline{display:flex;gap:36px;flex-wrap:wrap;margin-top:26px}
.stat .n{font-size:30px;font-weight:800}.stat .k{color:var(--dim);font-size:13px}
ul.ticks{list-style:none;padding:0;margin:18px 0 0}ul.ticks li{padding:8px 0 8px 30px;position:relative;color:#c3ccda}
ul.ticks li::before{content:"";position:absolute;left:0;top:14px;width:14px;height:9px;border-left:2px solid var(--brand);border-bottom:2px solid var(--brand);transform:rotate(-45deg)}
/* pricing */
.tiers{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;align-items:stretch}
@media(max-width:1000px){.tiers{grid-template-columns:1fr 1fr}}@media(max-width:600px){.tiers{grid-template-columns:1fr}}
.tier{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:26px 22px;display:flex;flex-direction:column;position:relative}
.tier.feat{border-color:transparent;background:
  linear-gradient(var(--surface),var(--surface)) padding-box,var(--grad) border-box;border:1.5px solid transparent;box-shadow:0 14px 44px rgba(106,155,255,.14)}
.tier .tag{position:absolute;top:-11px;left:22px;background:var(--grad);color:#0a0d13;font-size:11px;font-weight:800;letter-spacing:.05em;padding:4px 11px;border-radius:999px}
.tier h3{color:#fff;margin-bottom:4px}.tier .sub{color:var(--dim);font-size:13.5px;min-height:38px}
.price{font-size:38px;font-weight:800;margin:12px 0 2px;color:#fff}.price small{font-size:15px;color:var(--mut);font-weight:600}
.tier ul{list-style:none;padding:0;margin:16px 0 22px;flex:1}
.tier ul li{padding:7px 0 7px 24px;position:relative;font-size:14.5px;color:#c3ccda;border-top:1px solid var(--line)}
.tier ul li:first-child{border-top:0}
.tier ul li::before{content:"→";position:absolute;left:0;color:var(--brand);font-weight:700}
.tier .btn{width:100%;text-align:center}
.seats{margin-top:10px;font-size:12.5px;color:var(--brand);text-align:center;font-weight:600}
.soon{font-size:11px;color:var(--dim);text-align:center;margin-top:9px}
/* contact form */
.form{background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:28px}
label{display:block;font-size:13px;color:var(--mut);font-weight:600;margin:14px 0 6px}
input,textarea,select{width:100%;font:inherit;font-size:15px;color:var(--ink);background:var(--surface2);border:1px solid var(--line2);border-radius:10px;padding:12px 14px}
input:focus,textarea:focus{outline:none;border-color:var(--brand)}
/* legal */
.legal{max-width:820px}.legal h2{margin-top:36px}.legal p,.legal li{color:#b9c2d1;font-size:15.5px}
.legal ul{padding-left:20px}
.updated{color:var(--dim);font-size:13px}
/* footer */
footer{border-top:1px solid var(--line);background:var(--bg2);padding:56px 0 34px;margin-top:20px}
.fgrid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
@media(max-width:820px){.fgrid{grid-template-columns:1fr 1fr}}
.fcol h4{font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--dim);margin:0 0 14px}
.fcol a{display:block;color:var(--mut);font-size:14px;padding:5px 0}.fcol a:hover{color:#fff}
.disc{margin-top:40px;padding-top:22px;border-top:1px solid var(--line);color:var(--dim);font-size:12.5px;max-width:820px}
.copy{margin-top:16px;color:var(--dim);font-size:13px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* dropdown nav */
.menu .drop{position:relative;display:flex;align-items:center}
.menu .drop>.dtog{color:var(--mut);font-size:14.5px;font-weight:500;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.menu .drop:hover>.dtog,.menu .drop:focus-within>.dtog,.menu .drop>.dtog.on{color:#fff}
.menu .drop>.dtog::after{content:"";width:6px;height:6px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg) translateY(-2px);opacity:.65}
.menu .dmenu{display:none;position:absolute;top:calc(100% + 12px);left:50%;transform:translateX(-50%);min-width:230px;flex-direction:column;gap:2px;background:linear-gradient(180deg,rgba(160,107,255,.20),rgba(106,155,255,.11)),rgba(14,12,24,.90);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border:1px solid rgba(160,107,255,.34);border-radius:12px;padding:8px;box-shadow:0 22px 50px rgba(70,25,130,.38),0 10px 30px rgba(0,0,0,.5);z-index:60}
.menu .dmenu::before{content:"";position:absolute;top:-14px;left:0;right:0;height:14px}
.menu .drop:hover>.dmenu,.menu .drop:focus-within>.dmenu{display:flex}
.menu .dmenu a{display:block;padding:9px 12px;border-radius:8px;font-size:14px;white-space:nowrap;color:var(--mut)}
.menu .dmenu a:hover{background:rgba(160,107,255,.24);color:#fff}
.menu .dmenu a b{display:block;font-weight:700;color:#fff;font-size:13.5px}
.menu .dmenu a span{display:block;font-size:12px;color:var(--dim);font-weight:500}
@media(max-width:820px){
  .menu.open .drop{flex-direction:column;align-items:flex-start;width:100%}
  .menu.open .drop>.dtog{padding:13px 24px;width:100%}
  .menu.open .drop>.dtog::after{display:none}
  .menu.open .dmenu{display:flex;position:static;transform:none;border:0;box-shadow:none;background:transparent;padding:0 0 6px;min-width:0;width:100%}
  .menu.open .dmenu::before{display:none}
  .menu.open .dmenu a{padding:10px 24px 10px 42px}
}