/* Pro PWA Main CSS (dark-only) — neon & glass */
:root{
  --bg:#0a0a0a; --bg-2:#0c0c0d;
  --fg:#e9eef1; --muted:#9aa0a6; --border:rgba(255,255,255,.08);
  --card:#121214; --shadow:0 10px 30px rgba(0,0,0,.35);
  --radius:16px; --container:1200px;
  --brand:#ff2d55; --brand-2:#00e5ff; --ring:#7cfcff;
  --grad:linear-gradient(135deg,var(--brand),var(--brand-2));
  --glass:blur(14px) saturate(110%);
}
*{box-sizing:border-box}
:root{color-scheme:dark}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:'Rubik',system-ui,-apple-system,Segoe UI,Roboto,Arial,'Noto Sans';
  color:var(--fg); background:var(--bg); line-height:1.6;
  background-image:
    radial-gradient(1200px 600px at 10% -10%,rgba(0,229,255,.06),transparent 40%),
    radial-gradient(1000px 500px at 100% 0%,rgba(255,45,85,.06),transparent 45%),
    linear-gradient(90deg,#141417 1px,transparent 1px),
    linear-gradient(0deg,#141417 1px,transparent 1px);
  background-size:auto,auto,48px 48px,48px 48px;
}
a{color:inherit;text-decoration:none}
.container{max-width:var(--container);margin:0 auto;padding:0 20px}
:focus-visible{outline:2px solid var(--ring);outline-offset:2px}

.site-header{position:sticky;top:0;z-index:1000;backdrop-filter:var(--glass);-webkit-backdrop-filter:var(--glass);background:rgba(10,10,10,.68);border-bottom:1px solid var(--border);transition:box-shadow .3s,background-color .3s}
.site-header.scrolled{box-shadow:var(--shadow);background:rgba(10,10,10,.9)}
.nav{display:flex;align-items:center;justify-content:space-between;height:90px;gap:16px}
.brand img{height:60px}
.menu{display:flex;gap:10px}
.menu a{padding:10px 14px;border-radius:10px;font-weight:600;color:var(--muted)}
.menu a.active,.menu a:hover{color:var(--fg);background:rgba(255,255,255,.06)}
.header-glow{position:sticky;top:89px;inset-inline:0;height:2px;z-index:999;background:linear-gradient(90deg,transparent,var(--brand-2),var(--brand),transparent);filter:blur(.6px) drop-shadow(0 0 10px rgba(0,229,255,.25))}
.btn{display:inline-flex;align-items:center;gap:10px;padding:10px 16px;border-radius:12px;font-weight:800;background:var(--grad);color:#090909;border:0;cursor:pointer;box-shadow:0 10px 30px rgba(0,229,255,.22),inset 0 1px 0 rgba(255,255,255,.3);transition:transform .25s, box-shadow .25s}
.btn:hover{transform:translateY(-3px);box-shadow:0 12px 34px rgba(0,229,255,.33),inset 0 1px 0 rgba(255,255,255,.3)}
.btn--secondary{background:transparent;border:1px solid var(--border);color:var(--fg);box-shadow:none}
.btn--secondary:hover{background:rgba(255,255,255,.06)}

.section-header{text-align:center;margin:20px 0 26px}
.h2{margin:0 0 6px;font-size:clamp(26px,4vw,38px);font-weight:800;letter-spacing:-.5px}
.h3{margin:28px 0 8px;font-size:1.2rem}
.muted{color:var(--muted)}
.small{font-size:.92rem}
.footer-grid{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.site-footer{border-top:1px solid var(--border);padding:24px 0;background:var(--bg)}

.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}
.tab{border:1px solid var(--border);background:rgba(255,255,255,.02);padding:10px 14px;border-radius:12px;cursor:pointer;font-weight:700}
.tab[aria-selected="true"]{background:linear-gradient(180deg,rgba(255,255,255,.06),rgba(255,255,255,.03))}
.panel{display:none}
.panel[aria-hidden="false"]{display:block}
.grid-form{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.grid-form .span-2{grid-column:1/-1}
@media (max-width:900px){.grid-form{grid-template-columns:1fr}}
.suffix-wrap{position:relative}
.form-input{border-radius:12px;border:1px solid var(--border);background:rgba(255,255,255,.02);color:var(--fg);padding:12px 14px;transition:border-color .25s, box-shadow .25s, background .25s;font:inherit}
.form-input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(0,229,255,.2)}
.form-input.suffix{padding-right:64px}
.suf{position:absolute;inset:auto 8px 8px auto;height:28px;display:grid;place-items:center;padding:0 8px;border:1px solid var(--border);border-radius:8px;background:rgba(255,255,255,.06);font-size:.9rem;color:var(--muted)}

.card{background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,.01)),var(--card);border:1px solid var(--border);border-radius:var(--radius);transition:transform .35s,box-shadow .35s,border-color .35s,background .35s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-8px);box-shadow:0 20px 40px rgba(0,0,0,.25)}
.pad-responsive{padding:clamp(20px,4vw,44px)}

.row-gap{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.kp{display:inline-flex;align-items:baseline;gap:8px;font-weight:800;font-size:clamp(22px,4vw,32px)}
.hr-neon{height:2px;border:0;margin:10px 0 14px;background:linear-gradient(90deg,transparent,var(--brand-2),var(--brand),transparent);filter:drop-shadow(0 0 8px rgba(0,229,255,.25))}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace}
.rounded{border-radius:6px}

.mode-switch{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.pill{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid var(--border);border-radius:999px;background:rgba(255,255,255,.02);cursor:pointer}
.unit-switch{display:flex;gap:8px;margin-right:10px}

.list{margin:0;padding:0;list-style:none}
.note{border-left:3px solid var(--brand-2);padding:10px 12px;background:rgba(255,255,255,.03);border-radius:10px}

.tbl{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--border);border-radius:12px;overflow:hidden}
.tbl th,.tbl td{padding:10px 12px;border-bottom:1px solid var(--border)}
.tbl th{background:rgba(255,255,255,.04);text-align:left}
.tbl tr:last-child td{border-bottom:0}

.modal[aria-hidden="true"]{display:none}
.modal{position:fixed;inset:0;z-index:1200;display:grid;place-items:center}
.modal__backdrop{position:absolute;inset:0;background:rgba(0,0,0,.55);backdrop-filter: blur(4px)}
.modal__dialog{position:relative;z-index:1;width:min(720px, calc(100% - 32px));background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:0 30px 60px rgba(0,0,0,.5);padding:18px;animation:modalIn .2s ease-out}
.modal__close{position:absolute;top:8px;right:10px;width:36px;height:36px;border:1px solid var(--border);border-radius:10px;background:transparent;color:var(--fg);cursor:pointer;font-size:20px;line-height:1}
@keyframes modalIn{from{transform:translateY(8px);opacity:.6}to{transform:none;opacity:1}}