:root{
  --bg:#0f1115; --card:#171a21; --border:#262b36; --text:#e6e8ec;
  --muted:#8b93a3; --accent:#ff5a3c; --accent2:#3ca7ff; --good:#3ddc84;
}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,Segoe UI,Roboto,Arial,sans-serif}
header{display:flex;align-items:center;justify-content:space-between;padding:16px 24px;border-bottom:1px solid var(--border)}
header h1{font-size:18px;margin:0}
nav button{background:none;border:1px solid var(--border);color:var(--muted);padding:8px 16px;margin-left:8px;border-radius:6px;cursor:pointer}
nav button.active{background:var(--accent);color:#fff;border-color:var(--accent)}
main{padding:24px;max-width:1200px;margin:0 auto}
.view.hidden{display:none}
.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:20px;margin-bottom:20px}
.card h2{margin-top:0;font-size:15px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.upload-card input,button{font-size:14px}
#upload-btn,#back-btn{background:var(--accent);color:#fff;border:none;padding:10px 18px;border-radius:6px;cursor:pointer;margin-left:10px}
#back-btn{margin-left:0;margin-bottom:16px;background:var(--border);color:var(--text)}
table{width:100%;border-collapse:collapse;font-size:13px}
th,td{padding:8px 10px;text-align:left;border-bottom:1px solid var(--border)}
th{color:var(--muted);font-weight:600}
tr.best td{color:var(--good);font-weight:600}
tr.clickable{cursor:pointer}
tr.clickable:hover{background:#1e2330}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
@media (max-width:900px){.grid-2{grid-template-columns:1fr}}
canvas{background:#0c0e13;border-radius:8px}
.map-toolbar{display:flex;gap:16px;margin-bottom:10px;font-size:13px;color:var(--muted)}
.stat-grid{display:flex;gap:24px;flex-wrap:wrap}
.stat{min-width:120px}
.stat .v{font-size:22px;font-weight:700}
.stat .l{font-size:12px;color:var(--muted)}
#upload-status{color:var(--muted);margin-top:10px}

/* --- comparison bar --- */
.compare-bar{display:flex;align-items:flex-end;gap:24px;flex-wrap:wrap}
.compare-field{display:flex;flex-direction:column;gap:6px}
.compare-field label{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.compare-field select{background:#0c0e13;color:var(--text);border:1px solid var(--border);
  border-radius:6px;padding:8px 10px;min-width:190px}
#delta-summary{margin-left:auto;text-align:right}
.delta-big{font-size:30px;font-weight:800;line-height:1.1}

/* --- semantic colors --- */
.gain,.v.good{color:var(--good)}
.loss{color:var(--accent)}
.neutral,.muted{color:var(--muted)}
.accent,.v.accent{color:#ffb020}

/* --- delta highlights --- */
.highlight-cols{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:16px}
.highlight-cols h3{font-size:12px;text-transform:uppercase;letter-spacing:.04em;margin:0 0 8px}
.highlight-cols ul{list-style:none;padding:0;margin:0;font-size:13px}
.highlight-cols li{padding:5px 0;border-bottom:1px solid var(--border)}
.badge{display:inline-block;min-width:26px;text-align:center;padding:2px 6px;border-radius:5px;
  font-size:11px;font-weight:700;color:#0f1115;margin-right:8px}
.badge.gain{background:var(--good)}
.badge.loss{background:var(--accent)}
@media (max-width:900px){.highlight-cols{grid-template-columns:1fr}}

.hint{font-size:12px;color:var(--muted);margin:10px 0 0}
#consistency-note{font-size:13px;color:var(--muted);margin:14px 0 0}
#corners-table td,#ranking-table td{white-space:nowrap}

/* --- big map card --- */
.map-card{padding:14px}
.map-card canvas{width:100%;height:auto;display:block;background:#0c0e13;border-radius:10px}
.map-legend{display:flex;align-items:center;gap:18px;flex-wrap:wrap;
  margin-top:12px;font-size:12px;color:var(--muted)}
.map-legend .lg{display:inline-flex;align-items:center;gap:6px;color:var(--text)}
.map-legend .lg i{width:22px;height:8px;border-radius:4px;display:inline-block}

/* --- mistake headline callout (attachment style) --- */
.headline-banner{display:flex;align-items:flex-start;gap:14px;margin-bottom:14px;
  padding:14px 16px;border:1px solid #ff8a3c;border-radius:10px;
  background:linear-gradient(90deg,rgba(255,90,60,.16),rgba(255,90,60,.04))}
.headline-banner.hidden{display:none}
.hb-icon{flex:0 0 30px;height:30px;border-radius:6px;border:2px solid #ffb020;
  color:#ffb020;font-weight:800;display:flex;align-items:center;justify-content:center}
.hb-main{font-size:15px;margin-bottom:4px}
.hb-sub{font-size:12.5px;color:var(--muted);line-height:1.5}
.hb-sub b{color:var(--text)}
.linkish{background:none;border:none;color:#ffb020;text-decoration:underline;
  cursor:pointer;font-size:inherit;padding:0}

/* ===== app shell: sidebar + content (reference layout) ===== */
.shell{display:flex;min-height:100vh}
.sidebar{width:232px;flex:0 0 232px;background:#12151c;border-right:1px solid var(--border);
  padding:18px 0;position:sticky;top:0;height:100vh;overflow-y:auto}
.brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:15px;
  padding:0 18px 18px;border-bottom:1px solid var(--border);margin-bottom:14px}
.nav-group{font-size:10.5px;letter-spacing:.09em;text-transform:uppercase;
  color:#6b7280;padding:16px 18px 7px}
.nav-item{display:flex;align-items:center;gap:11px;width:100%;background:none;border:none;
  color:#c3c9d4;padding:10px 18px;font-size:13.5px;text-align:left;cursor:pointer}
.nav-item .ni{width:17px;text-align:center;opacity:.85}
.nav-item:hover:not(:disabled){background:#1a1f29;color:#fff}
.nav-item.active{background:var(--accent);color:#fff;font-weight:600}
.nav-item:disabled{opacity:.35;cursor:default}
.content{flex:1;min-width:0;display:flex;flex-direction:column}
.content main{padding:20px 24px;max-width:none;margin:0}

/* top bar with the lap chips */
.topbar{display:flex;align-items:center;gap:16px;padding:12px 24px;
  border-bottom:1px solid var(--border);background:#12151c}
.topbar.hidden{display:none}
.crumb{display:flex;align-items:center;gap:9px;font-size:14px;font-weight:600}
.avatar{width:26px;height:26px;border-radius:50%;background:var(--accent);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:700}
.chips{margin-left:auto;display:flex;gap:12px}
.chip{display:flex;align-items:center;gap:18px;padding:8px 16px;border-radius:8px;min-width:230px}
.chip-lap{background:#0f9b7a;color:#04120e}
.chip-best{background:#2563c9;color:#eaf1ff}
.chip-label{font-size:11.5px;font-weight:600;opacity:.9}
.chip-time{margin-left:auto;font-size:16px;font-weight:800;font-variant-numeric:tabular-nums}

/* two-column detail */
.detail-grid{display:grid;grid-template-columns:minmax(330px,0.85fr) 1.6fr;gap:18px;align-items:start}
@media (max-width:1200px){.detail-grid{grid-template-columns:1fr}
  .sidebar{width:64px;flex-basis:64px}
  .brand span,.nav-item span:not(.ni),.nav-group{display:none}}
.col-left,.col-right{min-width:0;display:flex;flex-direction:column;gap:18px}

/* the lap headline card */
.lap-card{border-top:3px solid #0f9b7a}
.lap-title{font-size:19px;font-weight:700;margin-bottom:2px}
.lap-time-row{display:flex;align-items:baseline;gap:12px}
.lap-time{font-size:38px;font-weight:800;letter-spacing:-.5px;font-variant-numeric:tabular-nums}
.lap-diff{font-size:15px;font-weight:700}
.lap-date{font-size:12px;color:var(--muted);margin-top:2px}
.lap-car{font-size:13.5px;margin:12px 0 16px;color:var(--text)}
.stats-table{width:100%;font-size:13px}
.stats-table th{font-size:11px;text-transform:uppercase;letter-spacing:.05em}
.stats-table td:last-child{text-align:right;font-variant-numeric:tabular-nums;font-weight:600}

.laps-scroll,.seg-scroll{max-height:280px;overflow-y:auto;margin-top:12px}
.laps-scroll table,.seg-scroll table{font-size:12.5px}
.laps-scroll thead th,.seg-scroll thead th{position:sticky;top:0;background:var(--card);z-index:1}
tr.sel td{background:#1d2836}
.map-toolbar{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:12px;font-size:12px;color:var(--muted)}
.map-toolbar select{background:#0c0e13;color:var(--text);border:1px solid var(--border);
  border-radius:6px;padding:6px 9px;margin-left:6px;font-size:12.5px}
.seg-btn{background:#2a3140;border:1px solid var(--border);color:var(--text);
  border-radius:6px;padding:4px 11px;font-size:11.5px;cursor:pointer}
.seg-btn:hover{background:var(--accent);border-color:var(--accent)}
.code-block{background:#0c0e13;border:1px solid var(--border);border-radius:8px;
  padding:14px;font-size:12px;overflow-x:auto;color:#c3c9d4}

/* ===== corner zoom overlay ===== */
.zoom-overlay{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;
  justify-content:center;padding:28px;background:rgba(6,8,12,.82);
  backdrop-filter:blur(3px);overflow-y:auto}
.zoom-overlay.hidden{display:none}
.zoom-box{position:relative;background:var(--card);border:1px solid var(--border);
  border-radius:12px;padding:22px;width:min(980px,96vw);max-height:92vh;
  overflow-y:auto;box-shadow:0 24px 70px rgba(0,0,0,.6)}
.zoom-close{position:absolute;top:12px;right:14px;width:30px;height:30px;
  border-radius:50%;border:1px solid var(--border);background:#0c0e13;
  color:var(--text);font-size:17px;line-height:1;cursor:pointer;z-index:2}
.zoom-close:hover{background:var(--accent);border-color:var(--accent);color:#fff}
.zoom-title{font-size:16px;font-weight:700;margin:0 40px 14px 0}
.zoom-box canvas{width:100%;height:auto;display:block;background:#0c0e13;
  border-radius:8px;margin-bottom:14px}
.zoom-note{font-size:12px;color:var(--muted);line-height:1.55;margin-bottom:16px}

/* ===== upload panel ===== */
.upload-row{display:flex;flex-direction:column;gap:8px;margin-bottom:14px}
.upload-row label{font-size:12px;color:var(--muted)}
.upload-row input[type=file]{background:#0c0e13;border:1px dashed var(--border);
  border-radius:8px;padding:14px;color:var(--text);font-size:13px}

/* ===== file diagnostics panel ===== */
.chan-list{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 4px}
.chan-list span{background:#0c0e13;border:1px solid var(--border);border-radius:5px;
  padding:2px 8px;font-size:11px;color:var(--muted);font-family:ui-monospace,monospace}
.diag-summary{display:flex;flex-wrap:wrap;gap:18px;margin-bottom:10px;font-size:13px}
.diag-table{width:100%;font-size:12.5px;margin-top:8px}
.diag-table td:first-child{color:var(--muted);width:38%}

/* ===== mistake list ===== */
.mistake-row{display:flex;align-items:flex-start;gap:12px;padding:11px 0;
  border-bottom:1px solid var(--border)}
.mistake-row:last-child{border-bottom:none}
.mk-loss{flex:0 0 74px;font-weight:800;font-size:15px;color:var(--accent);
  font-variant-numeric:tabular-nums}
.mk-body{flex:1;min-width:0;font-size:13px;line-height:1.5}
.mk-body b{color:var(--text)}
.mk-btn{flex:0 0 auto;background:#2a3140;border:1px solid var(--border);
  color:var(--text);border-radius:6px;padding:5px 12px;font-size:11.5px;cursor:pointer}
.mk-btn:hover{background:var(--accent);border-color:var(--accent);color:#fff}

/* ===== landing page ===== */
.landing{position:relative;min-height:100vh;overflow:hidden}
.landing.hidden{display:none}
.shell.hidden{display:none}
.landing-bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.grid-lines{position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 90% 60% at 50% 0%,#000 30%,transparent 75%)}
.glow{position:absolute;border-radius:50%;filter:blur(120px);opacity:.34}
.glow-a{width:620px;height:620px;background:#ff4d1c;top:-220px;right:-140px}
.glow-b{width:520px;height:520px;background:#0d6efd;top:220px;left:-200px;opacity:.24}
.landing-nav{position:relative;z-index:2;display:flex;align-items:center;
  justify-content:space-between;padding:22px 46px}
.brand-lg{font-size:19px;letter-spacing:-.2px}
.brand-lg b{color:var(--accent)}
.landing-nav nav{display:flex;align-items:center;gap:26px}
.landing-nav a{color:var(--muted);text-decoration:none;font-size:14px}
.landing-nav a:hover{color:var(--text)}
.btn-primary{background:var(--accent);color:#fff;border:none;border-radius:8px;
  padding:12px 24px;font-size:14px;font-weight:600;cursor:pointer}
.btn-primary:hover{filter:brightness(1.1)}
.btn-primary.wide{width:100%;margin-top:6px;padding:13px}
.btn-ghost{background:transparent;color:var(--text);border:1px solid #3a4150;
  border-radius:8px;padding:11px 22px;font-size:14px;cursor:pointer}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent)}

.hero{position:relative;z-index:2;display:grid;grid-template-columns:1.05fr .95fr;
  gap:44px;align-items:center;padding:52px 46px 84px;max-width:1320px;margin:0 auto}
.eyebrow{display:inline-block;font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--accent);border:1px solid rgba(255,90,60,.4);border-radius:100px;
  padding:5px 14px;margin-bottom:22px}
.hero h1{font-size:60px;line-height:1.03;margin:0 0 20px;letter-spacing:-1.6px}
.hero h1 .hl{background:linear-gradient(90deg,#ff8a3c,#ff4d1c);
  -webkit-background-clip:text;background-clip:text;color:transparent}
.hero-copy p{font-size:16px;line-height:1.65;color:#b9c0cc;max-width:520px;margin:0 0 30px}
.hero-copy code{background:#1a1f29;padding:1px 6px;border-radius:4px;font-size:14px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:40px}
.hero-stats{display:flex;gap:38px;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-size:17px}
.hero-stats span{font-size:12px;color:var(--muted)}
.hero-visual canvas{width:100%;height:auto;filter:drop-shadow(0 18px 50px rgba(255,77,28,.22))}

.features{position:relative;z-index:2;display:grid;
  grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;
  padding:0 46px 76px;max-width:1320px;margin:0 auto}
.feat{background:rgba(23,26,33,.72);border:1px solid var(--border);border-radius:12px;padding:24px}
.feat .fi{font-size:24px;margin-bottom:12px}
.feat h3{margin:0 0 8px;font-size:16px}
.feat p{margin:0;font-size:13.5px;line-height:1.6;color:var(--muted)}

.how{position:relative;z-index:2;max-width:820px;margin:0 auto;padding:0 46px 76px}
.how h2{font-size:26px;margin-bottom:22px}
.how ol{padding-left:20px;color:var(--muted);line-height:2.1;font-size:14.5px}
.how b{color:var(--text)}
.landing-foot{position:relative;z-index:2;text-align:center;padding:30px;
  border-top:1px solid var(--border);color:var(--muted);font-size:12.5px}
@media (max-width:900px){.hero{grid-template-columns:1fr;padding:32px 22px 56px}
  .hero h1{font-size:40px}.landing-nav{padding:18px 22px}
  .features,.how{padding-left:22px;padding-right:22px}}

/* ===== auth modal ===== */
.auth-modal{position:fixed;inset:0;z-index:1200;display:flex;align-items:center;
  justify-content:center;padding:24px;background:rgba(6,8,12,.86);backdrop-filter:blur(4px)}
.auth-modal.hidden{display:none}
.auth-box{position:relative;background:var(--card);border:1px solid var(--border);
  border-radius:14px;padding:26px;width:min(430px,96vw);
  box-shadow:0 26px 70px rgba(0,0,0,.65)}
.auth-close{position:absolute;top:12px;right:14px;width:30px;height:30px;border-radius:50%;
  border:1px solid var(--border);background:#0c0e13;color:var(--text);font-size:17px;cursor:pointer}
.auth-tabs{display:flex;gap:6px;margin-bottom:22px}
.auth-tab{flex:1;background:#0c0e13;border:1px solid var(--border);color:var(--muted);
  padding:10px;border-radius:8px;font-size:13.5px;cursor:pointer}
.auth-tab.active{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.auth-form{display:flex;flex-direction:column;gap:14px}
.auth-form.hidden{display:none}
.auth-form label{display:flex;flex-direction:column;gap:6px;font-size:12.5px;color:var(--muted)}
.auth-form input{background:#0c0e13;border:1px solid var(--border);border-radius:8px;
  padding:11px 12px;color:var(--text);font-size:14px}
.auth-form input:focus{outline:none;border-color:var(--accent)}
.opt{color:#5f6875}
.pw-hint{font-size:11.5px;color:var(--muted);line-height:1.5}
.auth-msg{font-size:12.5px;min-height:16px;line-height:1.5}
.auth-msg.err{color:var(--accent)}
.auth-msg.ok{color:var(--good)}

/* ===== account + invites ===== */
.user-chip{padding:8px 18px 12px;font-size:12.5px;color:var(--muted)}
.user-chip b{display:block;color:var(--text);font-size:13.5px}
.invite-form{display:flex;gap:10px;flex-wrap:wrap;margin:14px 0}
.invite-form input{background:#0c0e13;border:1px solid var(--border);border-radius:8px;
  padding:9px 11px;color:var(--text);font-size:13px}
.invite-form input[type=number]{width:96px}
.invite-code{background:#0c0e13;border:1px dashed var(--accent);border-radius:8px;
  padding:14px;margin:12px 0;font-family:ui-monospace,monospace;font-size:17px;
  letter-spacing:2px;text-align:center;color:var(--text)}