/* ============================================================
   Katsjiengville Airline Challenge — design system
   Aesthetic: airline departure board meets boarding pass.
   Deep night-sky navy, runway-amber accents, split-flap type feel.
   ============================================================ */
:root{
  --navy-900:#0a1730;
  --navy-800:#0f2143;
  --navy-700:#16305e;
  --navy-600:#1d3d75;
  --sky:#00b3e6;
  --sky-deep:#0085b3;
  --amber:#f4b740;
  --amber-deep:#d99a1f;
  --paper:#f5f8fc;
  --paper-2:#e9eff7;
  --ink:#13203a;
  --ink-soft:#5a6a85;
  --line:#d9e2ee;
  --good:#1f9d6b;
  --warn:#e07a3c;
  --bad:#d6494f;
  --shadow:0 10px 40px rgba(8,18,40,.16);
  --radius:16px;
  --maxw:1080px;
  --mono:'Roboto Mono','Courier New',monospace;
  --sans:'Inter','Segoe UI',system-ui,-apple-system,sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:var(--sans);color:var(--ink);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(0,179,230,.12), transparent 60%),
    radial-gradient(900px 500px at 0% 0%, rgba(244,183,64,.10), transparent 55%),
    var(--navy-900);
  -webkit-font-smoothing:antialiased;
}
a{color:var(--sky-deep);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%}

/* ---------- layout shell ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.app{min-height:100vh;display:flex;flex-direction:column}
main{flex:1;padding:32px 0 64px}

/* ---------- top bar ---------- */
.topbar{
  background:linear-gradient(180deg,var(--navy-800),var(--navy-900));
  border-bottom:1px solid rgba(255,255,255,.06);
  position:sticky;top:0;z-index:40;
}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:12px;color:#fff;font-weight:700;letter-spacing:.5px}
.brand .logo{height:34px;width:auto;display:block}
.brand small{display:block;font-weight:400;font-size:11px;letter-spacing:2px;color:var(--sky);text-transform:uppercase}
.brand b{font-size:16px;line-height:1.1}
.topnav{display:flex;gap:18px;align-items:center}
.topnav a{color:#c6d3e6;font-size:14px}
.topnav a:hover{color:#fff;text-decoration:none}
.chip{background:rgba(255,255,255,.08);color:#fff;border-radius:999px;padding:6px 14px;font-size:13px;font-family:var(--mono)}

/* ---------- hero / departure board ---------- */
.board{
  background:linear-gradient(160deg,var(--navy-700),var(--navy-900));
  border:1px solid rgba(255,255,255,.08);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  color:#eaf1fb;overflow:hidden;position:relative;
}
.board-strip{height:8px;background:repeating-linear-gradient(90deg,var(--amber) 0 26px,var(--navy-800) 26px 30px)}
.board-inner{padding:42px 38px}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:3px;text-transform:uppercase;color:var(--amber)}
.board h1{font-size:clamp(28px,5vw,46px);margin:10px 0 14px;line-height:1.05;color:#fff;font-weight:800;letter-spacing:-.5px}
.board p.lead{font-size:17px;color:#c4d2e8;max-width:60ch;line-height:1.6}

/* split-flap stat row */
.flaps{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.flap{
  font-family:var(--mono);background:#06101f;color:var(--amber);
  border:1px solid rgba(255,255,255,.08);border-radius:8px;
  padding:10px 14px;font-size:14px;letter-spacing:1px;
  box-shadow:inset 0 -10px 18px rgba(0,0,0,.4);
}
.flap span{color:#7f93b3;display:block;font-size:10px;letter-spacing:2px;text-transform:uppercase;margin-bottom:3px}

/* ---------- cards ---------- */
.card{
  background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);
  padding:30px 30px;margin:22px 0;border:1px solid rgba(255,255,255,.4);
}
.card.tight{padding:22px 24px}
.card h2{margin:0 0 6px;font-size:22px;letter-spacing:-.3px}
.card h3{margin:18px 0 8px;font-size:16px}
.muted{color:var(--ink-soft)}
.center{text-align:center}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;border:none;
  font-family:var(--sans);font-weight:600;font-size:15px;border-radius:11px;
  padding:13px 22px;transition:transform .08s ease,box-shadow .2s ease,background .2s;
  text-decoration:none;
}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:linear-gradient(180deg,var(--sky),var(--sky-deep));color:#fff;box-shadow:0 6px 18px rgba(0,133,179,.35)}
.btn-amber{background:linear-gradient(180deg,var(--amber),var(--amber-deep));color:#2a1c00;box-shadow:0 6px 18px rgba(217,154,31,.35)}
.btn-ghost{background:transparent;border:1.5px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--sky);color:var(--sky-deep)}
.btn-block{width:100%;justify-content:center}
.btn[disabled]{opacity:.5;cursor:not-allowed;transform:none}
.btn-lg{font-size:17px;padding:16px 28px}

/* ---------- forms ---------- */
label.fl{display:block;font-weight:600;font-size:14px;margin:0 0 6px;color:var(--ink)}
.hint{font-size:12.5px;color:var(--ink-soft);margin-top:4px}
input[type=text],input[type=email],input[type=tel],input[type=number],input[type=password],select,textarea{
  width:100%;font-family:var(--sans);font-size:15px;color:var(--ink);
  background:#fff;border:1.5px solid var(--line);border-radius:10px;padding:12px 14px;
  transition:border-color .15s,box-shadow .15s;
}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--sky);box-shadow:0 0 0 3px rgba(0,179,230,.15)}
input.invalid{border-color:var(--bad);box-shadow:0 0 0 3px rgba(214,73,79,.12)}
.field{margin-bottom:18px}
.field-err{color:var(--bad);font-size:12.5px;margin-top:5px;display:none}
.field.show-err .field-err{display:block}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:18px}
@media(max-width:680px){.grid2,.grid3{grid-template-columns:1fr}}

/* decision row: label | input | guidance */
.drow{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:18px;align-items:start;
  padding:16px 0;border-bottom:1px solid var(--line)}
.drow:last-child{border-bottom:none}
.drow .dlabel{font-weight:600}
.drow .dlabel small{display:block;font-weight:400;color:var(--ink-soft);font-size:12.5px;margin-top:3px}
.drow .dguide{font-size:12.5px;color:var(--ink-soft);background:var(--paper-2);border-radius:8px;padding:8px 11px}
@media(max-width:760px){.drow{grid-template-columns:1fr;gap:8px}.drow .dguide{order:3}}

/* input with unit prefix/suffix */
.inwrap{position:relative;display:flex;align-items:center}
.inwrap .unit{position:absolute;right:12px;font-family:var(--mono);font-size:13px;color:var(--ink-soft);pointer-events:none}
.inwrap .pre{position:absolute;left:12px;font-family:var(--mono);font-size:13px;color:var(--ink-soft);pointer-events:none}
.inwrap input.has-pre{padding-left:34px}

/* ---------- progress / steps ---------- */
.steps{display:flex;gap:8px;margin:0 0 22px;flex-wrap:wrap}
.step{flex:1;min-width:120px;background:rgba(255,255,255,.7);border:1px solid var(--line);
  border-radius:10px;padding:10px 12px;font-size:13px;color:var(--ink-soft);position:relative}
.step.active{background:#fff;border-color:var(--sky);color:var(--ink);font-weight:600;box-shadow:0 4px 14px rgba(0,179,230,.18)}
.step.done{background:var(--navy-700);border-color:var(--navy-700);color:#dbe7f6}
.step .num{font-family:var(--mono);font-size:11px;display:block;opacity:.7}

/* year journey timeline */
.journey{display:flex;align-items:center;gap:0;margin:8px 0 26px;flex-wrap:wrap}
.jnode{display:flex;flex-direction:column;align-items:center;gap:6px;color:#9fb1cd;font-size:12px}
.jnode .dot{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.08);
  border:2px solid rgba(255,255,255,.18);color:#cfe0f5;font-weight:700;font-family:var(--mono)}
.jnode.done .dot{background:var(--good);border-color:var(--good);color:#fff}
.jnode.active .dot{background:var(--sky);border-color:var(--sky);color:#fff;box-shadow:0 0 0 5px rgba(0,179,230,.2)}
.jline{flex:1;height:2px;min-width:24px;background:rgba(255,255,255,.16)}
.jline.done{background:var(--good)}

/* ---------- messages ---------- */
.msg{border-radius:12px;padding:14px 16px;font-size:14.5px;margin:14px 0;border:1px solid}
.msg-info{background:#eef7fc;border-color:#bfe3f3;color:#0c5a78}
.msg-good{background:#eafaf2;border-color:#bce8d3;color:#157a52}
.msg-warn{background:#fff5ec;border-color:#f6d6b8;color:#9a5320}
.msg-bad{background:#fdeced;border-color:#f4c4c7;color:#a32b30}

/* ---------- results ---------- */
.is-table{width:100%;border-collapse:collapse;font-size:14.5px}
.is-table td{padding:9px 0;border-bottom:1px solid var(--line)}
.is-table td.r{text-align:right;font-family:var(--mono)}
.is-table tr.total td{font-weight:700;border-top:2px solid var(--navy-700);border-bottom:none}
.is-table tr.sub td{color:var(--ink-soft)}
.profit-pos{color:var(--good)}
.profit-neg{color:var(--bad)}
.kpis{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:18px 0}
.kpi{background:var(--paper-2);border-radius:12px;padding:16px;text-align:center}
.kpi .v{font-family:var(--mono);font-size:22px;font-weight:700;color:var(--navy-700)}
.kpi .l{font-size:12px;color:var(--ink-soft);text-transform:uppercase;letter-spacing:1px;margin-top:4px}

/* feedback list */
.fb{list-style:none;padding:0;margin:10px 0}
.fb li{display:flex;gap:10px;padding:11px 14px;border-radius:10px;margin:8px 0;font-size:14.5px}
.fb li.good{background:#eafaf2}
.fb li.warn{background:#fff5ec}
.fb li.info{background:#eef7fc}
.fb li .ic{flex:0 0 auto}

/* leaderboard */
.lb{width:100%;border-collapse:collapse;font-size:15px}
.lb th{text-align:left;font-size:12px;text-transform:uppercase;letter-spacing:1px;color:var(--ink-soft);padding:8px 10px;border-bottom:2px solid var(--line)}
.lb td{padding:11px 10px;border-bottom:1px solid var(--line)}
.lb .rk{font-family:var(--mono);font-weight:700;color:var(--navy-700);width:48px}
.lb tr.me{background:#eef7fc}
.lb .medal{font-size:18px}

/* ---------- video ---------- */
.video-card{background:#000;border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);margin:16px 0}
.video-card video{display:block;width:100%;height:auto;background:#000}
.video-meta{padding:14px 18px;background:var(--navy-800);color:#dbe7f6;font-size:14px;display:flex;justify-content:space-between;align-items:center}
.video-list{display:flex;flex-direction:column;gap:8px;margin:14px 0}
.vchip{display:flex;align-items:center;gap:12px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:11px 14px;cursor:pointer}
.vchip.active{border-color:var(--sky);box-shadow:0 4px 14px rgba(0,179,230,.16)}
.vchip .pin{width:30px;height:30px;border-radius:50%;background:var(--navy-700);color:#fff;display:grid;place-items:center;font-size:13px}
.vchip.watched .pin{background:var(--good)}

/* ---------- footer ---------- */
footer.site{background:var(--navy-900);border-top:1px solid rgba(255,255,255,.06);color:#8295b3;padding:26px 0;font-size:13px}
footer.site .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
footer.site a{color:var(--sky)}
.gear{opacity:.5;transition:opacity .2s}
.gear:hover{opacity:1}

/* ---------- autosave indicator ---------- */
.saver{position:fixed;bottom:18px;right:18px;background:var(--navy-800);color:#cfe0f5;
  border:1px solid rgba(255,255,255,.12);border-radius:999px;padding:9px 16px;font-size:13px;
  font-family:var(--mono);box-shadow:var(--shadow);z-index:60;display:flex;align-items:center;gap:8px;
  opacity:0;transform:translateY(8px);transition:opacity .25s,transform .25s}
.saver.show{opacity:1;transform:none}
.saver .led{width:8px;height:8px;border-radius:50%;background:var(--good)}
.saver.saving .led{background:var(--amber)}
.saver.err .led{background:var(--bad)}

/* ---------- plane animation ---------- */
.flightline{position:relative;height:54px;margin:10px 0;overflow:hidden}
.flightline .track{position:absolute;top:50%;left:0;right:0;height:2px;background:repeating-linear-gradient(90deg,rgba(255,255,255,.25) 0 12px,transparent 12px 22px)}
.plane{position:absolute;top:50%;transform:translateY(-50%);font-size:26px;animation:fly 12s linear infinite}
@keyframes fly{from{left:-6%}to{left:106%}}
@media (prefers-reduced-motion: reduce){
  .plane{animation:none;left:46%}
  .btn:hover{transform:none}
}

/* utility */
.row{display:flex;gap:14px;flex-wrap:wrap}
.row.between{justify-content:space-between;align-items:center}
.mt0{margin-top:0}.mb0{margin-bottom:0}
.spacer{height:18px}
.divider{height:1px;background:var(--line);margin:22px 0}
.pill{display:inline-block;background:var(--navy-700);color:#fff;border-radius:999px;padding:4px 12px;font-size:12px;font-family:var(--mono)}
.pill.amber{background:var(--amber);color:#2a1c00}
.pill.good{background:var(--good)}
.pill.bad{background:var(--bad)}
.hide{display:none!important}