/* ═══════════════════════════════════════════════════════════════
   VITAL VIN SCAN — Auth (login / signup)
   Professional fleet theme · slate · blue · amber
   ═══════════════════════════════════════════════════════════════ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0e1420;--surface:#151c2c;--surface2:#1c2436;--surface3:#252f44;
  --accent:#3d8bff;--accent-soft:#5b9dff;--accent2:#ff9436;--accent3:#34d399;
  --text:#eef2f8;--text-dim:#94a3b8;--text-muted:#56627a;
  --border:rgba(148,163,184,0.16);--border2:rgba(148,163,184,0.09);
  --danger:#f87171;--success:#34d399;--warning:#fbbf24;
  --font-display:'Archivo',system-ui,sans-serif;
  --font-body:'IBM Plex Sans',system-ui,sans-serif;
  --font-mono:'IBM Plex Mono',ui-monospace,monospace;
}
html,body{min-height:100vh;background:var(--bg);color:var(--text);font-family:var(--font-body);-webkit-font-smoothing:antialiased;}
body{
  background:
    radial-gradient(900px 500px at 50% -15%, rgba(61,139,255,0.10), transparent 65%),
    radial-gradient(700px 400px at 50% 115%, rgba(255,148,54,0.05), transparent 60%),
    var(--bg);
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:40px 20px;position:relative;min-height:100vh;
}

.back-link{
  position:absolute;top:22px;left:22px;z-index:10;
  font-family:var(--font-body);font-size:13px;font-weight:500;
  color:var(--text-dim);text-decoration:none;
  padding:8px 14px;border-radius:8px;
  display:inline-flex;align-items:center;gap:6px;transition:all 0.15s;
}
.back-link:hover{color:var(--accent);background:rgba(61,139,255,0.07);}

.auth-shell{width:100%;max-width:420px;position:relative;z-index:1;}

.auth-brand{text-align:center;margin-bottom:30px;}
.auth-mark{
  width:52px;height:52px;border-radius:13px;
  background:linear-gradient(140deg,var(--accent),#2563eb);
  box-shadow:0 6px 20px rgba(61,139,255,0.4);
  margin:0 auto 14px;position:relative;
  display:flex;align-items:center;justify-content:center;
}
.auth-mark::before{content:'';position:absolute;width:22px;height:22px;border:2.5px solid rgba(255,255,255,0.95);border-radius:5px;}
.auth-mark::after{content:'';position:absolute;width:22px;height:2.5px;background:rgba(255,255,255,0.95);transform:rotate(45deg);}
.auth-name{
  font-family:var(--font-display);font-weight:800;font-size:22px;
  color:var(--text);letter-spacing:-0.01em;
}
.auth-sub{
  font-size:11px;color:var(--text-dim);letter-spacing:0.16em;
  text-transform:uppercase;margin-top:3px;font-weight:600;
}

.auth-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:16px;padding:30px 28px;
  box-shadow:0 20px 60px rgba(0,0,0,0.4);
}

.mode-tabs{
  display:flex;background:var(--surface2);
  border:1px solid var(--border2);
  border-radius:10px;padding:4px;margin-bottom:24px;
}
.mode-tab{
  flex:1;padding:10px;
  font-family:var(--font-body);font-size:13px;font-weight:600;
  background:transparent;border:none;color:var(--text-dim);
  cursor:pointer;border-radius:7px;transition:all 0.15s;
}
.mode-tab.active{background:var(--accent);color:#fff;box-shadow:0 2px 8px rgba(61,139,255,0.3);}

.auth-title{
  font-family:var(--font-display);font-weight:700;
  font-size:20px;letter-spacing:-0.01em;
  margin-bottom:5px;color:var(--text);
}
.auth-desc{font-size:13px;color:var(--text-dim);line-height:1.6;margin-bottom:24px;}

.form-group{margin-bottom:16px;}
.form-group:last-child{margin-bottom:0;}
.form-label{
  display:block;
  font-family:var(--font-body);font-size:11px;font-weight:600;
  letter-spacing:0.03em;color:var(--text-dim);text-transform:uppercase;
  margin-bottom:7px;
}
.form-input{
  width:100%;background:var(--surface2);
  border:1px solid var(--border);border-radius:8px;
  color:var(--text);font-family:var(--font-body);font-size:14px;
  padding:12px 14px;outline:none;transition:all 0.15s;
}
.form-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(61,139,255,0.15);}
.form-input::placeholder{color:var(--text-muted);}
/* invite code reads better in mono */
#join-code{font-family:var(--font-mono);}

.sub-tabs{
  display:flex;gap:7px;margin-bottom:20px;padding-bottom:16px;
  border-bottom:1px solid var(--border2);
}
.sub-tab{
  flex:1;padding:9px;font-family:var(--font-body);font-size:12px;font-weight:600;
  border:1px solid var(--border);background:transparent;color:var(--text-dim);
  border-radius:8px;cursor:pointer;transition:all 0.15s;
}
.sub-tab.active{border-color:var(--accent);color:var(--accent);background:rgba(61,139,255,0.07);}

.btn-submit{
  width:100%;background:var(--accent);color:#fff;
  font-family:var(--font-body);font-weight:600;
  font-size:14px;padding:14px;border:none;border-radius:8px;cursor:pointer;
  transition:all 0.15s;margin-top:8px;
  box-shadow:0 2px 8px rgba(61,139,255,0.3);
}
.btn-submit:hover:not(:disabled){background:var(--accent-soft);box-shadow:0 4px 14px rgba(61,139,255,0.4);transform:translateY(-1px);}
.btn-submit:active:not(:disabled){transform:translateY(0);}
.btn-submit:disabled{opacity:0.55;cursor:not-allowed;}

.form-aux{text-align:center;margin-top:20px;font-size:13px;color:var(--text-dim);}
.form-aux a{color:var(--accent);text-decoration:none;font-weight:500;}
.form-aux a:hover{text-decoration:underline;}

.alert{padding:11px 13px;border-radius:8px;font-size:13px;line-height:1.5;margin-bottom:16px;display:none;}
.alert.show{display:block;}
.alert.error{background:rgba(248,113,113,0.1);border:1px solid rgba(248,113,113,0.3);color:var(--danger);}
.alert.success{background:rgba(52,211,153,0.08);border:1px solid rgba(52,211,153,0.3);color:var(--accent3);}
.alert.info{background:rgba(61,139,255,0.07);border:1px solid rgba(61,139,255,0.3);color:var(--accent);}

.spinner-inline{
  display:inline-block;width:13px;height:13px;
  border:2px solid rgba(255,255,255,0.35);border-top-color:#fff;
  border-radius:50%;animation:spin 0.7s linear infinite;
  vertical-align:middle;margin-right:7px;
}
@keyframes spin{to{transform:rotate(360deg)}}

.hidden{display:none!important;}

.code-hint{font-size:12px;color:var(--text-dim);line-height:1.6;margin-top:5px;}

.trial-note{
  margin-top:16px;padding:11px 13px;
  background:rgba(52,211,153,0.07);border:1px solid rgba(52,211,153,0.25);
  border-radius:8px;font-size:12px;color:var(--accent3);line-height:1.5;
  text-align:center;font-weight:500;
}