/* Shared design tokens used by the hub and every track (mba/, ielts/, ...). */
:root{
  --navy:#0F172A;--navy2:#1E293B;
  --blue:#3B82F6;--blue2:#2563EB;--blue-light:#EFF6FF;
  --orange:#F97316;--green:#10B981;--green-light:#ECFDF5;
  --red:#EF4444;--red-light:#FEF2F2;
  --gray1:#F8FAFC;--gray2:#F1F5F9;--gray3:#E2E8F0;--gray4:#CBD5E1;--gray5:#94A3B8;--gray6:#64748B;--gray7:#475569;--gray8:#1E293B;
  --white:#FFFFFF;
  --font-main:'DM Sans',sans-serif;
  --font-display:'DM Serif Display',serif;
  --font-mono:'JetBrains Mono',monospace;
  --radius:8px;--radius-lg:12px;--radius-xl:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:var(--font-main);background:var(--gray2);color:var(--gray8);min-height:100vh;font-size:15px;line-height:1.5}
.screen{display:none;min-height:100vh}
.screen.active{display:flex}

/* LOGIN (shared across every track) */
#login-screen{align-items:center;justify-content:center;background:linear-gradient(135deg,var(--navy) 0%,#1a3a6b 100%)}
.login-card{background:var(--white);border-radius:var(--radius-xl);padding:2.5rem;width:400px;box-shadow:0 20px 60px rgba(0,0,0,0.3)}
.login-logo{font-family:var(--font-display);font-size:2rem;color:var(--navy);text-align:center;margin-bottom:.25rem}
.login-sub{text-align:center;color:var(--gray6);font-size:.875rem;margin-bottom:2rem}
.form-group{margin-bottom:1.25rem}
.form-group label{display:block;font-size:.8rem;font-weight:600;color:var(--gray7);text-transform:uppercase;letter-spacing:.05em;margin-bottom:.4rem}
.form-group input{width:100%;padding:.7rem 1rem;border:1.5px solid var(--gray3);border-radius:var(--radius);font-family:var(--font-main);font-size:.95rem;outline:none;transition:border-color .2s}
.form-group input:focus{border-color:var(--blue)}
.btn-primary{width:100%;padding:.8rem;background:var(--navy);color:var(--white);border:none;border-radius:var(--radius);font-family:var(--font-main);font-size:.95rem;font-weight:600;cursor:pointer}
.btn-primary:hover{background:var(--navy2)}
.error-msg{background:var(--red-light);color:var(--red);border-radius:var(--radius);padding:.6rem 1rem;font-size:.85rem;margin-bottom:1rem;display:none}

/* TOPBAR (shared across every track) */
.topbar{background:var(--white);border-bottom:1px solid var(--gray3);padding:.9rem 2rem;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:100}
.topbar-brand{font-family:var(--font-display);font-size:1.4rem;color:var(--navy)}
.topbar-right{display:flex;align-items:center;gap:1rem}
.topbar-user{font-size:.85rem;color:var(--gray6)}
.btn-logout{padding:.4rem .9rem;background:transparent;border:1.5px solid var(--gray3);border-radius:var(--radius);font-size:.8rem;cursor:pointer;color:var(--gray7);font-family:var(--font-main);text-decoration:none;display:inline-block}
.btn-logout:hover{background:var(--gray2)}

@media (max-width:520px){
  .topbar{flex-wrap:wrap;gap:.6rem;padding:.75rem 1rem}
  .topbar-right{flex-wrap:wrap;gap:.5rem}
}