/* ============================================================
   SALTLINE — harbor-neon design system
   Structure adapted from Start Bootstrap "Landing Page" (MIT),
   fully re-art-directed for the Saltline browser FPS.
   ============================================================ */

:root{
  /* harbor ink neutrals */
  --ink:#070d18;
  --ink-2:#0b1524;
  --ink-3:#101f33;
  --ink-4:#16293f;
  --line:rgba(94,234,212,.14);
  --line-strong:rgba(94,234,212,.3);

  /* dominant teal-cyan family */
  --teal:#12e6c4;
  --teal-deep:#0aa88f;
  --cyan:#38c9ff;

  /* full-chroma accents */
  --amber:#ffb347;
  --acid:#a6f750;
  --magenta:#ff3d81;
  --red:#ff5252;

  /* semantic */
  --ok:var(--acid);
  --warn:var(--amber);
  --danger:var(--red);
  --info:var(--cyan);

  /* text */
  --paper:#eaf7f2;
  --muted:#93aabf;
  --dim:#5f7891;

  --font-display:"Chakra Petch",system-ui,sans-serif;
  --font-body:"Inter",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,monospace;

  --nav-h:64px;
  --radius:14px;
  --shadow:0 20px 60px rgba(0,0,0,.5);
  --grad-brand:linear-gradient(100deg,var(--teal),var(--cyan) 55%,var(--magenta));
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001s!important;transition-duration:.001s!important}
}

body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;line-height:1.65;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

/* palette scrollbar */
html{scrollbar-color:var(--teal-deep) var(--ink-2);scrollbar-width:thin}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--ink-2)}
::-webkit-scrollbar-thumb{background:linear-gradient(var(--teal-deep),var(--cyan));border-radius:8px;border:2px solid var(--ink-2)}
::-webkit-scrollbar-thumb:hover{background:var(--teal)}

::selection{background:var(--teal);color:var(--ink)}

img,svg,video,iframe{display:block;max-width:100%}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--teal)}

.container{width:min(1180px,92%);margin-inline:auto}

h1,h2,h3,.display{font-family:var(--font-display);letter-spacing:.01em}

.eyebrow{
  font-family:var(--font-mono);font-size:.72rem;letter-spacing:.28em;
  text-transform:uppercase;color:var(--teal);
  display:inline-flex;align-items:center;gap:.6rem;
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--grad-brand)}

.section{padding:96px 0;position:relative;scroll-margin-top:calc(var(--nav-h) + 12px)}
.section-head{max-width:720px;margin-bottom:48px}
.section-head h2{font-size:clamp(1.7rem,3.4vw,2.6rem);line-height:1.15;margin:.6rem 0 .8rem}
.section-head p{color:var(--muted)}

/* ---------- layered ambient background ---------- */
.ambient{position:fixed;inset:0;z-index:-2;background:
  radial-gradient(60% 50% at 12% 0%,rgba(18,230,196,.10),transparent 60%),
  radial-gradient(50% 40% at 88% 12%,rgba(56,201,255,.10),transparent 60%),
  radial-gradient(70% 60% at 50% 110%,rgba(255,61,129,.07),transparent 60%),
  var(--ink);}
.grain{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.05;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");}

/* ---------- nav ---------- */
.nav{position:fixed;top:0;left:0;right:0;height:var(--nav-h);z-index:50;
  display:flex;align-items:center;
  background:rgba(7,13,24,.6);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:border-color .3s,background .3s;}
.nav.scrolled{background:rgba(7,13,24,.86);border-bottom-color:var(--line)}
.nav .container{display:flex;align-items:center;gap:1.4rem;width:min(1240px,94%)}
.brand{display:flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-weight:700;
  font-size:1.15rem;letter-spacing:.14em;color:var(--paper)}
.brand .dot{width:10px;height:10px;border-radius:50%;background:var(--acid);
  box-shadow:0 0 12px var(--acid);animation:pulse 2.2s infinite}
@keyframes pulse{0%,100%{transform:scale(1);opacity:1}50%{transform:scale(.7);opacity:.6}}
.brand em{font-style:normal;color:var(--teal)}
.nav-links{display:flex;gap:1.4rem;margin-left:auto;align-items:center}
.nav-links a{color:var(--muted);font-size:.9rem;font-weight:500;position:relative;padding:.3rem 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;height:2px;width:0;background:var(--grad-brand);transition:width .25s}
.nav-links a:hover,.nav-links a.active{color:var(--paper)}
.nav-links a.active::after,.nav-links a:hover::after{width:100%}
.nav-cta{margin-left:.4rem}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);color:var(--paper);
  width:42px;height:42px;border-radius:10px;font-size:1.2rem;cursor:pointer}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  font-family:var(--font-display);font-weight:600;letter-spacing:.06em;
  padding:.8rem 1.5rem;border-radius:12px;border:1px solid transparent;cursor:pointer;
  font-size:.95rem;transition:transform .15s,box-shadow .2s,background .2s,color .2s;user-select:none}
.btn:active{transform:translateY(1px) scale(.99)}
.btn-primary{background:var(--grad-brand);color:#041018;box-shadow:0 8px 30px rgba(18,230,196,.28)}
.btn-primary:hover{box-shadow:0 10px 40px rgba(56,201,255,.4);transform:translateY(-2px)}
.btn-ghost{background:rgba(18,230,196,.06);border-color:var(--line-strong);color:var(--teal)}
.btn-ghost:hover{background:rgba(18,230,196,.14);color:var(--paper)}
.btn-sm{padding:.5rem 1rem;font-size:.82rem;border-radius:10px}
.btn[disabled]{opacity:.5;cursor:not-allowed}

/* ---------- hero / stage ---------- */
.hero{padding:calc(var(--nav-h) + 40px) 0 60px;position:relative;overflow:hidden}
.hero .rain{position:absolute;inset:0;pointer-events:none;opacity:.16;
  background-image:repeating-linear-gradient(115deg,transparent 0 22px,rgba(148,220,255,.5) 22px 23px,transparent 23px 60px);
  animation:rain 1.1s linear infinite;}
@keyframes rain{from{background-position:0 0}to{background-position:-120px 240px}}
.hero-grid{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:2.4rem;align-items:center}
.hero-copy h1{font-size:clamp(2.2rem,4.6vw,3.6rem);line-height:1.05;margin:.9rem 0 1rem;text-transform:uppercase}
.hero-copy h1 .grad{background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-copy .lede{color:var(--muted);font-size:1.05rem;max-width:46ch}
.hero-badges{display:flex;flex-wrap:wrap;gap:.5rem;margin:1.2rem 0 1.6rem}
.badge{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.08em;color:var(--teal);
  border:1px solid var(--line-strong);border-radius:999px;padding:.32rem .8rem;background:rgba(18,230,196,.05)}
.badge.amber{color:var(--amber);border-color:rgba(255,179,71,.4);background:rgba(255,179,71,.06)}
.badge.magenta{color:var(--magenta);border-color:rgba(255,61,129,.4);background:rgba(255,61,129,.06)}
.hero-actions{display:flex;gap:.8rem;flex-wrap:wrap}
.hero-note{margin-top:1rem;color:var(--dim);font-size:.82rem}

/* game stage */
.stage{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line-strong);
  background:var(--ink-2) url("../../assets/poster.webp") center/cover no-repeat;
  box-shadow:var(--shadow);aspect-ratio:16/10;min-height:340px;}
.stage::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(7,13,24,.25),transparent 30%,transparent 70%,rgba(7,13,24,.5));}
.stage iframe{position:absolute;inset:0;width:100%;height:100%;border:0;background:#000}
.stage-bar{position:absolute;top:0;left:0;right:0;z-index:3;display:flex;align-items:center;gap:.6rem;
  padding:.6rem .8rem;background:linear-gradient(180deg,rgba(7,13,24,.85),transparent);}
.stage-status{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;color:var(--acid);
  display:flex;align-items:center;gap:.45rem;text-transform:uppercase}
.stage-status .led{width:8px;height:8px;border-radius:50%;background:var(--acid);box-shadow:0 0 10px var(--acid)}
.stage-status.loading{color:var(--amber)} .stage-status.loading .led{background:var(--amber);box-shadow:0 0 10px var(--amber);animation:pulse 1s infinite}
.stage-tools{margin-left:auto;display:flex;gap:.4rem}
.icon-btn{width:36px;height:36px;border-radius:9px;border:1px solid var(--line-strong);cursor:pointer;
  background:rgba(7,13,24,.6);color:var(--teal);display:grid;place-items:center;font-size:1rem;transition:background .2s,color .2s}
.icon-btn:hover{background:rgba(18,230,196,.16);color:var(--paper)}
.stage-gate{position:absolute;inset:0;z-index:2;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1rem;
  background:radial-gradient(60% 60% at 50% 45%,rgba(7,13,24,.25),rgba(7,13,24,.78));cursor:pointer;text-align:center;padding:1rem}
.stage-gate .play-ring{width:86px;height:86px;border-radius:50%;display:grid;place-items:center;
  background:var(--grad-brand);color:#041018;font-size:1.6rem;box-shadow:0 0 0 0 rgba(18,230,196,.5);animation:ring 2s infinite}
@keyframes ring{0%{box-shadow:0 0 0 0 rgba(18,230,196,.45)}70%{box-shadow:0 0 0 26px rgba(18,230,196,0)}100%{box-shadow:0 0 0 0 rgba(18,230,196,0)}}
.stage-gate h3{font-size:1.3rem;letter-spacing:.1em;text-transform:uppercase}
.stage-gate p{color:var(--muted);font-size:.85rem;max-width:40ch}
.stage-gate.hidden{display:none}
.stage.loading .stage-gate{pointer-events:none;opacity:.6}

/* ---------- feature cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.card{background:linear-gradient(180deg,var(--ink-3),var(--ink-2));border:1px solid var(--line);
  border-radius:var(--radius);padding:1.6rem;position:relative;overflow:hidden;transition:transform .25s,border-color .25s,box-shadow .25s}
.card:hover{transform:translateY(-5px);border-color:var(--line-strong);box-shadow:var(--shadow)}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--grad-brand);opacity:.7}
.card .ico{width:46px;height:46px;border-radius:12px;display:grid;place-items:center;font-size:1.3rem;margin-bottom:1rem;
  background:rgba(18,230,196,.1);color:var(--teal);border:1px solid var(--line-strong)}
.card h3{font-size:1.1rem;margin-bottom:.5rem}
.card p{color:var(--muted);font-size:.92rem}
.card .stat{font-family:var(--font-display);font-size:2rem;font-weight:700;color:var(--teal);line-height:1}
.card .stat small{font-size:.9rem;color:var(--muted);font-weight:400}

/* ---------- showcase rows ---------- */
.showcase-row{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;margin-bottom:1.4rem;background:var(--ink-2)}
.showcase-media{position:relative;min-height:300px;background:var(--ink-3)}
.showcase-media img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.showcase-media .tint{position:absolute;inset:0;background:linear-gradient(120deg,rgba(18,230,196,.18),rgba(255,61,129,.14))}
.showcase-body{padding:2.4rem;display:flex;flex-direction:column;justify-content:center;gap:.9rem}
.showcase-body h3{font-size:1.5rem}
.showcase-body p{color:var(--muted)}
.showcase-row.rev .showcase-media{order:2}
@media(max-width:860px){.showcase-row.rev .showcase-media{order:0}}

/* controls diagram */
.keys{display:flex;gap:1.6rem;align-items:center;flex-wrap:wrap}
.keycluster{display:grid;grid-template-columns:repeat(3,44px);gap:6px;justify-content:center}
.key{height:44px;border-radius:9px;border:1px solid var(--line-strong);background:var(--ink-4);
  display:grid;place-items:center;font-family:var(--font-mono);font-size:.85rem;color:var(--teal)}
.key.w{grid-column:2}
.key.blank{border-color:transparent;background:transparent}
.keylist{display:grid;gap:.5rem;font-size:.9rem;color:var(--muted)}
.keylist b{color:var(--paper);font-family:var(--font-mono);font-weight:600}
.objectives{display:grid;gap:.7rem;margin-top:.4rem}
.obj{display:flex;gap:.8rem;align-items:flex-start;font-size:.92rem;color:var(--muted)}
.obj .n{flex:0 0 26px;height:26px;border-radius:8px;display:grid;place-items:center;font-family:var(--font-mono);font-size:.8rem;color:#041018;font-weight:700}
.obj.acid .n{background:var(--acid)} .obj.magenta .n{background:var(--magenta)} .obj.cyan .n{background:var(--cyan)} .obj.red .n{background:var(--red)}
.obj b{color:var(--paper)}

/* ---------- coverage ---------- */
.press{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.press a{background:var(--ink-2);border:1px solid var(--line);border-radius:12px;padding:1.2rem;display:flex;flex-direction:column;gap:.4rem;transition:border-color .2s,transform .2s}
.press a:hover{border-color:var(--line-strong);transform:translateY(-3px)}
.press .src{font-family:var(--font-display);font-weight:700;color:var(--paper)}
.press .desc{color:var(--muted);font-size:.82rem}
.press .tag{font-family:var(--font-mono);font-size:.68rem;letter-spacing:.14em;color:var(--amber);text-transform:uppercase}

/* ---------- FAQ ---------- */
.faq{max-width:820px;margin-inline:auto;display:grid;gap:.8rem}
.faq-item{border:1px solid var(--line);border-radius:12px;background:var(--ink-2);overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;gap:1rem;text-align:left;cursor:pointer;
  background:none;border:0;color:var(--paper);font-family:var(--font-display);font-size:1.02rem;font-weight:600;padding:1.1rem 1.3rem}
.faq-q .chev{margin-left:auto;color:var(--teal);transition:transform .25s;font-size:1.1rem}
.faq-item.open .chev{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a-inner{padding:0 1.3rem 1.2rem;color:var(--muted);font-size:.94rem}

/* ---------- CTA ---------- */
.cta{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line-strong);
  background:linear-gradient(120deg,rgba(18,230,196,.14),rgba(56,201,255,.12) 50%,rgba(255,61,129,.14)),var(--ink-2);
  padding:3.4rem 2rem;text-align:center}
.cta h2{font-size:clamp(1.6rem,3.4vw,2.4rem);margin-bottom:.8rem}
.cta p{color:var(--muted);max-width:56ch;margin:0 auto 1.6rem}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line);padding:2.6rem 0;background:var(--ink-2)}
.foot-grid{display:flex;flex-wrap:wrap;gap:1.6rem;align-items:center;justify-content:space-between}
.foot-links{display:flex;gap:1.2rem;flex-wrap:wrap}
.foot-links a{color:var(--muted);font-size:.88rem}
.foot-links a:hover{color:var(--teal)}
.foot-note{color:var(--dim);font-size:.78rem;max-width:70ch}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media(max-width:960px){
  .hero-grid{grid-template-columns:1fr}
  .cards{grid-template-columns:1fr}
  .press{grid-template-columns:repeat(2,1fr)}
  .showcase-row{grid-template-columns:1fr}
  .nav-links{position:fixed;top:var(--nav-h);right:0;left:0;flex-direction:column;align-items:flex-start;
    background:rgba(7,13,24,.97);padding:1.2rem 6%;gap:1rem;border-bottom:1px solid var(--line);
    transform:translateY(-130%);transition:transform .3s;margin-left:0}
  .nav-links.open{transform:none}
  .menu-btn{display:grid;place-items:center}
  .nav-cta{display:none}
}
@media(max-width:560px){
  .press{grid-template-columns:1fr}
  .section{padding:64px 0}
  .stage{aspect-ratio:4/3;min-height:280px}
}