/* SlipLanding — marketing site (sliplanding.com)
   Dark marine-tech: deep navy, aqua accents, Fraunces display + Inter body.
   Self-contained static site — no build step. */
:root{
  --bg:#081826; --bg2:#0b1f30; --panel:#0d2431; --panel2:#10293a;
  --line:#1d4254; --line2:#27536a;
  --ink:#e9f2f1; --muted:#8fb0ba; --faint:#5f8290;
  --aqua:#5fd4ae; --aqua-dim:#3fbf9f; --cyan:#2aa8c4; --gold:#f2b950;
  --font-d:"Fraunces",Georgia,serif; --font-b:"Inter",system-ui,sans-serif;
  --r:14px; --wrap:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font:400 16px/1.6 var(--font-b);
  -webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:var(--aqua);text-decoration:none}
img,svg{display:block;max-width:100%}
::selection{background:#5fd4ae44}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.center{text-align:center}.narrow{max-width:640px;margin-inline:auto}

/* ---------- type ---------- */
h1,h2,h3{font-family:var(--font-d);font-weight:600;line-height:1.08}
h1{font-size:clamp(40px,5.6vw,72px);letter-spacing:-.01em}
h2{font-size:clamp(28px,3.4vw,44px);letter-spacing:-.01em}
h3{font-size:22px}
h4{font-size:16px;font-weight:600}
h5{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:10px}
.accent{color:var(--aqua)}
.kicker{font-size:11.5px;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:var(--aqua-dim);margin-bottom:14px}
.lede{font-size:clamp(16px,1.6vw,19px);color:var(--muted);max-width:34em;margin-top:18px}
.lede-sm{font-size:15.5px;color:var(--muted)}
.micro{font-size:12.5px;color:var(--faint)}
.micro.center{margin-top:14px}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 24px;border-radius:10px;font:600 14px var(--font-b);
  border:1px solid transparent;cursor:pointer;transition:transform .15s,box-shadow .15s,background .15s}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--aqua);color:#082018;box-shadow:0 6px 24px #5fd4ae33}
.btn-primary:hover{background:#6fe2bc;box-shadow:0 10px 30px #5fd4ae44}
.btn-ghost{border-color:var(--line2);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--aqua-dim);color:var(--aqua)}
.btn-block{width:100%}
.btn-nav{padding:10px 18px;font-size:13px}

/* ---------- tags ---------- */
.tag-plan,.tag-sig,.tag-live{display:inline-block;font-size:9.5px;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;padding:3px 8px;border-radius:5px;vertical-align:middle}
.tag-plan{background:#12303f;color:#6f9aac;border:1px solid #1d4254}
.tag-sig{background:#2aa8c41f;color:#6fd0e4;border:1px solid #2aa8c455}
.tag-live{background:#5fd4ae1f;color:#5fd4ae;border:1px solid #5fd4ae55}
.badge-dev{font:700 9.5px var(--font-b);letter-spacing:.1em;text-transform:uppercase;
  color:#0b1c26;background:var(--gold);padding:3px 8px;border-radius:5px;font-style:normal;margin-left:10px}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;display:flex;align-items:center;gap:28px;
  padding:14px 28px;background:#081826e8;backdrop-filter:blur(12px);
  border-bottom:1px solid #ffffff0d}
.nav-brand{display:flex;align-items:center;font:600 19px var(--font-d);color:var(--ink)}
.nav-brand .mark{width:34px;height:34px;margin-right:10px}
.nav-links{display:flex;gap:24px;margin-left:auto}
.nav-links a{font-size:13.5px;font-weight:500;color:var(--muted)}
.nav-links a:hover{color:var(--ink)}
.nav-links a.nav-app{color:var(--aqua);font-weight:600}
.nav-links a.nav-app:hover{color:#8af0cd}

/* ---------- hero ---------- */
.hero{position:relative;padding:72px 0 96px;overflow:hidden}
.hero-bg{position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(1000px 500px at 85% -10%, #2aa8c41a, transparent 60%),
    radial-gradient(800px 400px at 10% 110%, #5fd4ae14, transparent 60%)}
.hero-inner{position:relative;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,6fr);
  gap:56px;align-items:center;max-width:var(--wrap);margin:0 auto;padding:0 24px}
.hero-copy .lede{margin-bottom:30px}
.cta-row{display:flex;gap:14px;flex-wrap:wrap}
.hero-copy .micro{margin-top:16px}

/* ---------- device mockup ---------- */
.hero-stage{position:relative}
.device{background:#0a1c28;border:1px solid var(--line);border-radius:16px;
  overflow:hidden;box-shadow:0 30px 80px #00000066,0 4px 16px #00000044}
.device-bar{display:flex;align-items:center;gap:7px;padding:10px 14px;
  background:#0d2431;border-bottom:1px solid var(--line)}
.device-bar .dot{width:9px;height:9px;border-radius:50%;background:#1e4254}
.device-bar .dot:first-child{background:#e25f5f88}
.device-bar .dot:nth-child(2){background:#f2b95088}
.device-bar .dot:nth-child(3){background:#5fd4ae88}
.device-title{margin-left:8px;font-size:11.5px;font-weight:600;color:var(--muted)}
.device-chip{margin-left:auto;font-size:9px;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;color:#6fd0e4;background:#2aa8c41f;
  border:1px solid #2aa8c455;padding:3px 8px;border-radius:5px}
.device-screen{position:relative;aspect-ratio:640/420;background:var(--bg2)}
.device-screen.tall{aspect-ratio:auto}
.device-screen .scene{position:absolute;inset:0;width:100%;height:100%;
  opacity:0;transform:scale(1.035);transition:opacity .9s ease,transform 1.4s ease}
.device-screen .scene.on{opacity:1;transform:scale(1)}
.device-hud{display:flex;gap:8px;align-items:center;padding:10px 14px;
  border-top:1px solid var(--line);background:#0c1f2c}
.hud-tab{font-size:10.5px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;
  color:var(--faint);padding:5px 11px;border-radius:6px;transition:.2s}
.hud-tab.on{color:var(--aqua);background:#5fd4ae18}
.hud-note{margin-left:auto;font-size:9.5px;color:var(--faint);letter-spacing:.08em;text-transform:uppercase}
.device.flat{border-radius:12px;box-shadow:0 18px 50px #00000055}
.device.wide{max-width:860px;margin:0 auto}

.float-chip{position:absolute;background:#0d2431f0;border:1px solid var(--line2);
  border-radius:11px;padding:10px 14px;box-shadow:0 10px 30px #0006;
  font-size:11px;line-height:1.35}
.float-chip b{display:block;color:var(--ink);font-size:12px}
.float-chip span{color:var(--muted);font-size:10.5px}
.chip-a{top:40%;right:-14px;border-top:2px solid var(--cyan)}
.chip-b{bottom:12%;left:-18px;border-top:2px solid var(--gold)}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
.float-chip{animation:floaty 6s ease-in-out infinite}
.chip-b{animation-delay:-3s}

/* ---------- sections ---------- */
.band{padding:96px 0;position:relative}
.band.alt{background:linear-gradient(180deg,#0a1d2b,#091a28)}
.band h2{margin-bottom:20px}
.band h2.center{margin-bottom:16px}

.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:44px}
.step{background:var(--panel);border:1px solid var(--line);border-radius:var(--r);
  padding:26px 24px;transition:transform .2s,border-color .2s}
.step:hover{transform:translateY(-3px);border-color:var(--line2)}
.step.sig{border-color:#2aa8c466;background:linear-gradient(160deg,#0f2c3c,var(--panel))}
.step-ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;
  font-size:19px;color:var(--aqua);background:#5fd4ae14;border:1px solid #5fd4ae33;margin-bottom:16px}
.step h3{margin-bottom:8px}
.step p{font-size:13.5px;color:var(--muted)}
.step .tag-plan,.step .tag-sig{margin-top:10px}

.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);gap:64px;align-items:center}
.split.rev{grid-template-columns:minmax(0,1.1fr) minmax(0,1fr)}
.split.rev .split-copy{order:2}
.feats{list-style:none;margin:22px 0;display:grid;gap:11px}
.feats li{position:relative;padding-left:22px;font-size:14.5px;color:var(--muted)}
.feats li b{color:var(--ink);font-weight:600}
.feats li::before{content:"";position:absolute;left:0;top:8px;width:9px;height:9px;
  border-radius:3px;background:var(--aqua);opacity:.75}
.feats li:nth-child(even)::before{background:var(--cyan)}
.disclaimer{margin-top:26px;padding:18px 20px;border-radius:12px;font-size:13.5px;
  color:var(--muted);background:#f2b95012;border:1px solid #f2b95033}
.disclaimer b{color:#f5d58a;display:block;margin-bottom:5px;font-size:12.5px;
  letter-spacing:.06em;text-transform:uppercase}
.split-copy .btn{margin-top:22px}

.vision-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:44px}
.v-item{background:var(--panel);border:1px solid var(--line);border-radius:12px;
  padding:18px;transition:border-color .2s}
.v-item:hover{border-color:var(--line2)}
.v-item p{font-size:12.5px;color:var(--muted);margin:6px 0 12px}

/* ---------- preview ---------- */
.preview-tabs{display:flex;justify-content:center;gap:8px;margin:34px 0 26px}
.p-tab{font:600 13px var(--font-b);color:var(--muted);background:var(--panel);
  border:1px solid var(--line);padding:11px 20px;border-radius:9px;cursor:pointer;transition:.2s}
.p-tab:hover{color:var(--ink);border-color:var(--line2)}
.p-tab.on{color:#082018;background:var(--aqua);border-color:var(--aqua)}

/* ---------- early access ---------- */
.ea-card{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:56px;
  background:linear-gradient(150deg,#0f2c3c,#0c2233);border:1px solid var(--line2);
  border-radius:22px;padding:52px;box-shadow:0 30px 80px #00000044}
.ea-points{list-style:none;margin-top:20px;display:grid;gap:8px}
.ea-points li{font-size:14px;color:var(--muted);padding-left:20px;position:relative}
.ea-points li::before{content:"→";position:absolute;left:0;color:var(--aqua)}
.ea-form{background:#081826aa;border:1px solid var(--line);border-radius:16px;padding:28px}
.ea-audience{display:flex;gap:8px;margin-bottom:18px}
.ea-radio{flex:1;cursor:pointer}
.ea-radio input{position:absolute;opacity:0}
.ea-radio span{display:block;text-align:center;font-size:13px;font-weight:600;
  color:var(--muted);border:1px solid var(--line);border-radius:9px;padding:11px;transition:.2s}
.ea-radio.on span,.ea-radio input:checked+span{color:#082018;background:var(--aqua);border-color:var(--aqua)}
.field{margin-bottom:14px}
.field label{display:block;font-size:10.5px;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;color:var(--faint);margin-bottom:6px}
.field input{width:100%;background:var(--panel);border:1px solid var(--line);
  border-radius:9px;padding:12px 14px;color:var(--ink);font:400 14px var(--font-b)}
.field input:focus{outline:none;border-color:var(--aqua-dim);box-shadow:0 0 0 3px #5fd4ae22}
.hp{position:absolute!important;left:-9999px;height:1px;width:1px;overflow:hidden}
.consent{display:flex;gap:10px;align-items:flex-start;margin:16px 0 18px;cursor:pointer}
.consent input{margin-top:3px;accent-color:var(--aqua)}
.consent span{font-size:12px;color:var(--muted);line-height:1.5}
.ea-msg{min-height:20px;font-size:13px;margin-top:10px}
.ea-msg.ok{color:var(--aqua)}
.ea-msg.err{color:#e8949a}
.ea-msg a{color:var(--aqua);text-decoration:underline}
.privacy{font-size:11px;color:var(--faint);margin-top:14px;line-height:1.5}
.privacy a{color:var(--muted);text-decoration:underline}

/* ---------- footer ---------- */
.foot{border-top:1px solid var(--line);padding:56px 0 30px;background:#061320}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px}
.foot-brand{font:600 20px var(--font-d);margin-bottom:6px}
.foot-tag{font-size:13px;color:var(--muted)}
.foot-status{display:inline-block;margin-top:12px;font-size:10px;font-weight:700;
  letter-spacing:.1em;text-transform:uppercase;color:var(--gold);
  border:1px solid #f2b95044;padding:4px 9px;border-radius:5px}
.foot-grid a{display:block;font-size:13.5px;color:var(--muted);margin-bottom:8px}
.foot-grid a:hover{color:var(--aqua)}
.foot-legal{margin-top:44px;padding-top:20px;border-top:1px solid #ffffff10;
  font-size:11px;color:var(--faint);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}

/* ---------- reveal animation (JS-gated: no JS = always visible) ---------- */
html.js .band>.wrap,html.js .hero-copy,html.js .hero-stage{opacity:0;
  transform:translateY(18px);transition:opacity .7s ease,transform .7s ease}
html.js .in{opacity:1!important;transform:none!important}

/* ---------- responsive ---------- */
@media(max-width:1000px){
  .vision-grid{grid-template-columns:repeat(2,1fr)}
  .split,.split.rev{grid-template-columns:1fr;gap:40px}
  .split.rev .split-copy{order:1}
}
@media(max-width:820px){
  .nav-links{display:none}
  .nav{padding:12px 18px}
  .hero{padding:48px 0 72px}
  .hero-inner{grid-template-columns:1fr;gap:40px}
  .steps{grid-template-columns:1fr}
  .ea-card{grid-template-columns:1fr;padding:30px;gap:34px}
  .float-chip{display:none}
  .band{padding:64px 0}
  .foot-grid{grid-template-columns:1fr;gap:26px}
  .foot-legal{flex-direction:column;gap:6px}
}
@media(max-width:480px){
  .vision-grid{grid-template-columns:1fr}
  .cta-row .btn{flex:1}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .band>.wrap,.hero-copy,.hero-stage{opacity:1;transform:none}
  html{scroll-behavior:auto}
}