:root {
  --bg:#f7fafc; --surface:#fff; --text:#0f172a; --muted:#475569; --border:#e2e8f0;
  --primary:#2563eb; --primary-600:#1d4ed8; --ring:rgba(37,99,235,.25);
  --radius:16px; --shadow:0 10px 25px rgba(2,6,23,.06); --max:1100px;
  --weak:#ef4444; --fair:#f59e0b; --strong:#10b981; --great:#059669;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Helvetica,Arial,"Apple Color Emoji","Segoe UI Emoji",sans-serif;
}
a{color:inherit;text-decoration:none}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}
header{position:sticky;top:0;z-index:40;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:0 2px 10px rgba(2,6,23,.04)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px;font-weight:900;letter-spacing:.2px}
.logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,#60a5fa,#34d399);box-shadow:inset 0 0 16px rgba(255,255,255,.6)}
.btn{display:inline-flex;align-items:center;gap:8px;border:none;cursor:pointer;font-weight:800;letter-spacing:.2px}
.btn.primary{background:var(--primary);color:#fff;padding:12px 16px;border-radius:14px;box-shadow:0 6px 20px rgba(37,99,235,.18);transition:.2s transform,.2s box-shadow}
.btn.primary:hover{transform:translateY(-1px);box-shadow:0 12px 28px rgba(37,99,235,.24);background:var(--primary-600)}
.btn.ghost{background:transparent;color:var(--primary);padding:10px 14px;border-radius:12px;border:1px solid var(--primary)}
.btn.muted{background:#0f172a;color:#fff;padding:10px 14px;border-radius:12px}
.btn.icon{background:transparent;color:var(--muted);border:1px solid var(--border);padding:6px 10px;border-radius:10px;font-weight:800}
.btn[disabled]{opacity:.6;cursor:not-allowed}
.section{padding:40px 0}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.muted{color:var(--muted)}
.form-shell{max-width:520px;margin:0 auto}
.form-wrapper{padding:26px}
h1{margin:0 0 12px;font-size:clamp(24px,3.5vw,34px);font-weight:900}
label{display:block;margin-top:14px;font-weight:800}
input{width:100%;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:#fff;color:var(--text);outline:none;margin-top:6px}
input:focus{box-shadow:0 0 0 6px var(--ring);border-color:var(--primary)}
input[aria-invalid="true"]{border-color:#ef4444}
.field-error{font-size:12px;color:#b91c1c;margin-top:6px;display:none}
.field-error.show{display:block}
.tabs{display:flex;gap:22px;border-bottom:1px solid var(--border);margin-bottom:16px}
.tab{padding:10px 2px;font-weight:800;color:var(--muted);cursor:pointer;background:none;border:none}
.tab[aria-selected="true"]{color:var(--text);border-bottom:3px solid var(--primary);margin-bottom:-2px}
.pane{display:none}
.pane.active{display:block}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px;justify-content:flex-start}
.loading-backdrop{position:fixed;inset:0;background:rgba(255,255,255,.8);display:none;align-items:center;justify-content:center;z-index:2000}
.spinner{width:50px;height:50px;border:5px solid rgba(2,6,23,.15);border-top-color:var(--primary);border-radius:50%;animation:spin 1s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.error,.ok{padding:10px 12px;border-radius:12px;margin-top:12px;display:none}
.error{background:#fef2f2;border:1px solid #fecaca;color:#7f1d1d}
.ok{background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46}
.remember{display:flex;align-items:flex-start;gap:10px;margin-top:10px;color:var(--muted);font-weight:700;flex-wrap:wrap}
.remember input{flex:0 0 auto;width:18px;height:18px;margin-top:2px}
.remember span{flex:1 1 260px;line-height:1.4;white-space:normal;word-break:break-word}
.forgot-link{display:inline-block;margin-top:10px;font-size:14px;color:var(--primary);cursor:pointer;text-decoration:underline}
.forgot-link:hover{color:var(--primary-600)}
.input-wrap{position:relative}
.toggle-btn{position:absolute;right:8px;top:50%;transform:translateY(-50%)}
.meter{margin-top:8px}
.meter-track{height:8px;background:#e5e7eb;border-radius:999px;overflow:hidden}
.meter-bar{height:100%;width:0%;transition:width .25s ease;background:var(--weak)}
.meter-label{font-size:12px;font-weight:800;margin-top:6px}
.meter-weak .meter-bar{background:var(--weak)}
.meter-fair .meter-bar{background:var(--fair)}
.meter-strong .meter-bar{background:var(--strong)}
.meter-great .meter-bar{background:var(--great)}
.hint{font-size:12px;margin-top:6px;color:#475569}
.hint.good{color:#065f46}
.hint.bad{color:#b91c1c}
@media (max-width:420px){.form-wrapper{padding:20px}}