/* === Auth pages: login / signup / settings ===
   ChartForge shell — dark #09090b terminal aesthetic, Inter + JetBrains Mono,
   violet-blue-cyan brand gradient (tokens mirror site.html). No emoji.
*/
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#09090b;--bg2:#0f0f12;--bg3:#16161b;--bg4:#1c1c22;
  --border:rgba(255,255,255,0.08);--text:#f4f4f5;--text2:rgba(244,244,245,0.6);--cross:rgba(244,244,245,0.3);
  --up:#34d399;--dn:#f87171;--accent:#8b5cf6;
  --violet:#7c3aed;--blue:#3b82f6;--cyan:#06b6d4;
  --grad:linear-gradient(135deg,#7c3aed,#3b82f6,#06b6d4);
  --grad-text:linear-gradient(135deg,#a78bfa,#60a5fa,#22d3ee);
  --font-ui:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
body.light{
  --bg:#fafafa;--bg2:#ffffff;--bg3:#f4f4f5;--bg4:#e4e4e7;
  --border:rgba(9,9,11,0.12);--text:#18181b;--text2:#52525b;--cross:#a1a1aa;
  --up:#059669;--dn:#dc2626;--accent:#7c3aed;
  --grad-text:linear-gradient(135deg,#6d28d9,#2563eb,#0e7490);
}
html,body{height:100%}
body{
  background:
    radial-gradient(ellipse 90% 55% at 50% -10%,rgba(124,58,237,0.10),transparent 60%),
    radial-gradient(ellipse 70% 45% at 85% 110%,rgba(6,182,212,0.05),transparent 60%),
    var(--bg);
  color:var(--text);
  font-family:var(--font-ui);
  -webkit-font-smoothing:antialiased;
  font-size:14px;line-height:1.5;
  display:flex;flex-direction:column;
}
body.light{
  background:
    radial-gradient(ellipse 90% 55% at 50% -10%,rgba(124,58,237,0.06),transparent 60%),
    var(--bg);
}

/* Compact 40px nav matching chart.html */
.auth-nav{
  display:flex;align-items:center;gap:8px;padding:0 16px;height:40px;
  background:rgba(9,9,11,0.75);border-bottom:1px solid var(--border);flex-shrink:0;font-size:12px;
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
}
body.light .auth-nav{background:rgba(255,255,255,0.8)}
.auth-brand{display:flex;align-items:center;gap:8px;color:var(--text);font-weight:700;font-size:13px;letter-spacing:-0.02em;text-decoration:none}
.auth-brand img{width:20px;height:20px;border-radius:4px;display:block}
.auth-brand span{
  background:var(--grad-text);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.auth-brand .auth-mark{
  /* legacy letter mark — kept for compatibility, now a gradient tile */
  width:20px;height:20px;border-radius:4px;background:var(--grad);color:#fff;
  display:flex;align-items:center;justify-content:center;font-weight:700;font-size:11px;
  -webkit-text-fill-color:#fff;
}
.auth-nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.auth-nav-link{color:var(--text2);text-decoration:none;font-size:12px;font-weight:500;padding:6px 8px;border-radius:6px;transition:color 0.15s,background 0.15s}
.auth-nav-link:hover{color:var(--text);background:var(--bg3)}

/* Main canvas */
.auth-shell{flex:1;display:flex;align-items:center;justify-content:center;padding:32px 16px;min-height:0}
.auth-card{
  width:100%;max-width:380px;background:var(--bg2);border:1px solid var(--border);
  border-radius:14px;padding:28px 28px 24px;
  box-shadow:0 8px 40px rgba(0,0,0,0.45),0 0 80px rgba(124,58,237,0.07);
  position:relative;overflow:hidden;
}
.auth-card::before{
  content:'';position:absolute;top:0;left:0;right:0;height:2px;
  background:var(--grad);opacity:0.9;
}
body.light .auth-card{box-shadow:0 8px 32px rgba(9,9,11,0.08)}
.auth-card h1{
  font-size:18px;font-weight:700;letter-spacing:-0.02em;
  margin-bottom:4px;color:var(--text);
}
.auth-card .auth-sub{color:var(--text2);font-size:13px;margin-bottom:22px}

/* Form fields */
.auth-field{display:flex;flex-direction:column;gap:5px;margin-bottom:14px}
.auth-field label{color:var(--text2);font-size:10px;text-transform:uppercase;letter-spacing:0.08em;font-weight:600;font-family:var(--font-mono)}
.auth-input-wrap{position:relative;display:flex;align-items:center}
.auth-input-wrap svg{position:absolute;left:10px;color:var(--text2);pointer-events:none;flex-shrink:0}
.auth-input{
  width:100%;height:38px;padding:0 12px 0 34px;
  background:var(--bg3);color:var(--text);
  border:1px solid var(--border);border-radius:8px;
  font-size:13px;font-family:var(--font-ui);
  transition:border-color 0.15s,background 0.15s,box-shadow 0.15s;
}
.auth-input:focus{outline:none;border-color:var(--accent);background:var(--bg);box-shadow:0 0 0 3px rgba(124,58,237,0.18)}
.auth-input::placeholder{color:var(--cross)}
.auth-input.no-icon{padding-left:12px}
.auth-eye{
  position:absolute;right:8px;cursor:pointer;color:var(--text2);
  width:24px;height:24px;display:inline-flex;align-items:center;justify-content:center;
  border-radius:5px;transition:color 0.1s,background 0.1s;
}
.auth-eye:hover{color:var(--text);background:var(--bg4)}

/* Submit / primary button — brand gradient */
.auth-submit{
  width:100%;height:40px;margin-top:6px;
  background:var(--grad);border:1px solid transparent;color:#fff;
  border-radius:8px;font-size:13px;font-weight:600;letter-spacing:0.01em;
  cursor:pointer;transition:filter 0.15s,transform 0.05s,box-shadow 0.15s;
  font-family:var(--font-ui);
}
.auth-submit:hover{filter:brightness(1.12);box-shadow:0 4px 20px rgba(124,58,237,0.35)}
.auth-submit:active{transform:scale(0.99)}
.auth-submit:disabled{opacity:0.55;cursor:wait}
.auth-submit.danger{background:var(--dn);border-color:var(--dn);box-shadow:none}
.auth-submit.ghost{background:var(--bg4);border-color:var(--border);color:var(--text);box-shadow:none}
.auth-submit.ghost:hover{background:var(--bg3);filter:none}

/* Inline messages */
.auth-msg{
  margin-top:12px;padding:8px 10px;border-radius:6px;
  font-size:12px;display:none;line-height:1.4;
}
.auth-msg.error{display:block;background:rgba(248,113,113,0.10);color:var(--dn);border:1px solid rgba(248,113,113,0.3)}
.auth-msg.success{display:block;background:rgba(52,211,153,0.10);color:var(--up);border:1px solid rgba(52,211,153,0.3)}
.auth-msg.info{display:block;background:rgba(124,58,237,0.10);color:var(--accent);border:1px solid rgba(124,58,237,0.3)}

/* Footer link row */
.auth-footer{
  margin-top:20px;padding-top:16px;border-top:1px solid var(--border);
  text-align:center;color:var(--text2);font-size:12px;
}
.auth-footer a{color:var(--accent);text-decoration:none;font-weight:500}
.auth-footer a:hover{text-decoration:underline}

/* Settings page layout */
.settings-shell{flex:1;padding:32px 16px;display:flex;justify-content:center;min-height:0;overflow-y:auto}
.settings-container{width:100%;max-width:640px}
.settings-container h1{font-size:20px;font-weight:700;letter-spacing:-0.02em;margin-bottom:4px}
.settings-container .auth-sub{margin-bottom:24px}
.settings-section{
  background:var(--bg2);border:1px solid var(--border);border-radius:12px;
  padding:20px 22px;margin-bottom:16px;
}
.settings-section h2{
  font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:0.08em;
  color:var(--text2);margin-bottom:14px;font-family:var(--font-mono);
}
.settings-row{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:10px 0;border-bottom:1px solid var(--border);
}
.settings-row:last-child{border-bottom:none}
.settings-row-label{color:var(--text);font-size:13px;font-weight:500}
.settings-row-sub{color:var(--text2);font-size:11px;margin-top:2px;font-weight:400}
.settings-row-val{
  color:var(--text);font-size:13px;font-variant-numeric:tabular-nums;
  display:flex;align-items:center;gap:8px;
}
.settings-row-val .pill{
  font-size:10px;padding:2px 7px;background:var(--bg4);color:var(--text2);
  border-radius:4px;font-weight:600;letter-spacing:0.06em;text-transform:uppercase;
  font-family:var(--font-mono);
}
.settings-row-val .pill.role{background:rgba(124,58,237,0.16);color:var(--accent)}

/* Toggle switch */
.toggle{
  position:relative;display:inline-block;width:36px;height:20px;flex-shrink:0;cursor:pointer;
}
.toggle input{opacity:0;width:0;height:0;position:absolute}
.toggle-slider{
  position:absolute;inset:0;background:var(--bg4);border:1px solid var(--border);
  border-radius:10px;transition:background 0.15s,border-color 0.15s;
}
.toggle-slider::before{
  content:'';position:absolute;height:14px;width:14px;left:2px;top:2px;
  background:var(--text2);border-radius:50%;transition:transform 0.15s,background 0.15s;
}
.toggle input:checked + .toggle-slider{background:var(--accent);border-color:var(--accent)}
.toggle input:checked + .toggle-slider::before{transform:translateX(16px);background:#fff}

/* Settings select */
.settings-select{
  background:var(--bg4);color:var(--text);border:1px solid var(--border);
  border-radius:6px;padding:0 22px 0 8px;height:28px;font-size:12px;cursor:pointer;
  -webkit-appearance:none;-moz-appearance:none;appearance:none;font-family:var(--font-ui);
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'/></svg>");
  background-repeat:no-repeat;background-position:right 6px center;
}

/* Spinner inside submit button */
.auth-spinner{
  display:inline-block;width:12px;height:12px;border:2px solid rgba(255,255,255,0.4);
  border-top-color:#fff;border-radius:50%;animation:auth-spin 0.7s linear infinite;
  vertical-align:-2px;margin-right:6px;
}
@keyframes auth-spin{to{transform:rotate(360deg)}}

/* Small responsive tweak */
@media (max-width:520px){
  .auth-card{padding:22px 20px}
}