:root { --bt-purple: #641ba2; --bt-dark: #35164d; --bt-teal: #007c70; --bt-muted: #70677c; --bt-border: #e6dfed; }
.bt-login, .bt-home { font-family: Tahoma, 'Segoe UI', sans-serif; color: var(--bt-dark); background: #f7f5fa; font-size: 14px; line-height: 1.7; }
.bt-login *, .bt-home * { box-sizing: border-box; }
.bt-login a:focus-visible, .bt-home a:focus-visible, .bt-login button:focus-visible { outline: 3px solid var(--bt-teal); outline-offset: 3px; }
.bt-eyebrow { display: block; color: var(--bt-teal); font-size: 12px; font-weight: 700; letter-spacing: 1.3px; }
.bt-muted { color: var(--bt-muted); }
.bt-login { min-height: 100vh; margin: 0; padding: 64px 24px 24px; background: radial-gradient(ellipse at 12% 10%, #eae0f5 0, transparent 55%), radial-gradient(ellipse at 95% 90%, #dff4ed 0, transparent 50%), #f7f5fa; }
.bt-login-card { display: flex; max-width: 920px; margin: 5vh auto 0; background: white; border: 1px solid var(--bt-border); border-radius: 24px; box-shadow: 0 20px 70px #35164d12; overflow: hidden; }
.bt-login-brand { width: 44%; padding: 38px 30px; text-align: center; background: #faf7fd; border-right: 1px solid var(--bt-border); }
.bt-login-logo { display: block; width: 230px; max-width: 100%; margin: 0 auto 14px; border-radius: 18px; }
.bt-login-brand h1 { font-size: 30px; font-weight: 700; margin: 8px 0 12px; color: var(--bt-purple); }
.bt-login-brand p { color: var(--bt-muted); line-height: 1.9; }
.bt-version { display: inline-block; margin-top: 14px; color: var(--bt-muted); font-size: 12px; }
.bt-login-form { flex: 1; padding: 62px 48px 40px; }
.bt-login-form h2 { margin: 10px 0 12px; font-size: 30px; font-weight: 700; }
.bt-login-form form { margin-top: 30px; }
.bt-login-form .form-group { margin-bottom: 22px; }
.bt-login-form label { display: block; margin-bottom: 8px; font-weight: 500; }
.bt-login-form .form-control { height: 48px; border: 1px solid #cbc1d5; border-radius: 8px; box-shadow: none; font-size: 14px; padding: 12px 14px; }
.bt-login-form .form-control:focus { border-color: var(--bt-purple); box-shadow: 0 0 0 3px #641ba21a; }
.bt-login-submit { width: 100%; padding: 13px 20px; border: 0; border-radius: 8px; background: var(--bt-purple); color: white; font: inherit; font-weight: 700; cursor: pointer; }
.bt-login-submit:hover { background: #4d107f; }
.bt-login-submit span { float: right; }
.bt-login-help { margin: 28px 0 0; padding-top: 22px; border-top: 1px solid var(--bt-border); color: var(--bt-muted); font-size: 12px; line-height: 1.9; }
.bt-login-footer { margin: 28px auto 0; text-align: center; color: var(--bt-muted); font-size: 12px; }
.bt-masthead { min-height: 100px; padding: 12px 32px; display: flex; align-items: center; justify-content: space-between; background: white; border-top: 4px solid var(--bt-purple); }
.bt-brand { display: flex; align-items: center; gap: 16px; color: var(--bt-dark); text-decoration: none; }
.bt-brand:hover, .bt-brand:focus { color: var(--bt-purple); text-decoration: none; }
.bt-brand img { width: 78px; height: 78px; object-fit: contain; }
.bt-brand strong { display: block; color: var(--bt-purple); font-size: 24px; letter-spacing: .3px; }
.bt-brand span span { display: block; font-size: 13px; color: var(--bt-muted); }
.bt-system-tag { font-size: 12px; color: var(--bt-teal); background: #edf8f4; border: 1px solid #cce9e2; padding: 6px 12px; border-radius: 20px; }
.bt-system-tag span { color: var(--bt-muted); margin-left: 10px; }
.bt-home .navbar-default { border: 0; border-top: 1px solid var(--bt-border); border-bottom: 1px solid var(--bt-border); border-radius: 0; background: white; margin-bottom: 0; }
.bt-home .navbar-default .navbar-brand, .bt-home .navbar-default .navbar-nav > li > a { color: #483953; font-size: 14px; }
.bt-home .navbar-default .navbar-brand { color: var(--bt-purple); font-weight: 700; }
.bt-home .navbar-default .navbar-nav > .open > a, .bt-home .navbar-default .navbar-nav > li > a:hover, .bt-home .navbar-default .navbar-nav > li > a:focus { background: #f0e8f8; color: var(--bt-purple); }
.bt-home .dropdown-menu { padding: 8px 0; border: 1px solid var(--bt-border); border-top: 3px solid var(--bt-teal); border-radius: 0 0 10px 10px; box-shadow: 0 12px 26px #35164d18; }
.bt-home .dropdown-menu > li > a { padding: 8px 20px; color: #483953; line-height: 1.6; }
.bt-home .dropdown-menu > li > a:hover, .bt-home .dropdown-menu > li > a:focus { background: #f0e8f8; color: var(--bt-purple); }
.bt-home .dropdown-menu .divider { background: var(--bt-border); margin: 6px 0; }
.bt-home-main { max-width: 1200px; margin: 38px auto; padding: 0 28px; }
.bt-welcome { display: flex; align-items: center; justify-content: space-between; gap: 30px; background: white; border: 1px solid var(--bt-border); border-radius: 18px; padding: 36px 44px; border-left: 5px solid var(--bt-purple); }
.bt-welcome h1 { font-size: 30px; font-weight: 700; line-height: 1.5; margin: 12px 0; }
.bt-welcome-copy > p { color: var(--bt-muted); }
.bt-welcome-logo { width: 225px; height: 225px; object-fit: contain; }
.bt-menu-hint { display: inline-block; background: #edf8f4; color: #086a5f; padding: 10px 16px; border-radius: 8px; margin-top: 20px; font-size: 13px; }
.bt-menu-hint span { margin-right: 8px; font-size: 18px; }
.bt-home-details { display: grid; grid-template-columns: 1fr 1fr; gap: 42px; margin: 32px 0; padding: 12px 10px; }
.bt-home-details > div + div { border-left: 1px solid var(--bt-border); padding-left: 42px; }
.bt-detail-label { color: var(--bt-teal); font-size: 12px; font-weight: 700; }
.bt-home-details h2 { font-size: 17px; line-height: 1.7; margin: 8px 0 12px; }
.bt-home-details p { font-size: 13px; color: var(--bt-muted); }
.bt-home-footer { max-width: 1144px; margin: 30px auto; padding: 18px 10px; border-top: 1px solid var(--bt-border); color: var(--bt-purple); font-size: 12px; }
.bt-home-footer span { float: right; color: var(--bt-muted); }
.bt-register-main { max-width: 960px; }
.bt-register-card { margin-top: 24px; padding: 32px 40px; background: white; border: 1px solid var(--bt-border); border-radius: 18px; }
.bt-register-card h2 { margin: 8px 0 26px; font-size: 22px; font-weight: 700; }
.bt-register-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px 24px; }
.bt-register-card .form-group { margin-bottom: 22px; }
.bt-register-card label { display: block; margin-bottom: 8px; }
.bt-register-card .form-control { height: 48px; padding: 12px 14px; border: 1px solid #cbc1d5; border-radius: 8px; box-shadow: none; font: inherit; }
.bt-register-card .form-control:focus { border-color: var(--bt-purple); box-shadow: 0 0 0 3px #641ba21a; }
.bt-register-actions { display: flex; align-items: center; justify-content: flex-end; gap: 24px; margin-top: 8px; padding-top: 24px; border-top: 1px solid var(--bt-border); }
.bt-register-actions .bt-login-submit { width: auto; }
.bt-register-back { color: var(--bt-purple); }
.bt-register-actions button:focus-visible { outline: 3px solid var(--bt-teal); outline-offset: 3px; }
@media (max-width: 767px) {
    .bt-register-card { padding: 24px; }
    .bt-register-grid { grid-template-columns: 1fr; }
    .bt-register-actions { flex-direction: column-reverse; gap: 16px; }
    .bt-register-actions .bt-login-submit { width: 100%; }
}
@media (min-width: 768px) and (max-width: 1199px) { .bt-home .navbar-nav > li > a { padding-left: 9px; padding-right: 9px; } .bt-home .navbar-right { float: left !important; } }
@media (max-width: 767px) {
    .bt-login { padding: 20px 16px; }
    .bt-login-card { display: block; margin-top: 0; }
    .bt-login-brand { width: 100%; padding: 22px; border-right: 0; border-bottom: 1px solid var(--bt-border); }
    .bt-login-logo { width: 125px; margin-bottom: 8px; }
    .bt-login-brand h1 { font-size: 25px; }
    .bt-login-brand p { margin-bottom: 0; }
    .bt-version { margin-top: 6px; }
    .bt-login-form { padding: 28px 24px; }
    .bt-login-form h2 { font-size: 26px; }
    .bt-masthead { padding: 10px 16px; }
    .bt-brand { gap: 10px; }
    .bt-brand img { width: 60px; height: 60px; }
    .bt-brand strong { font-size: 20px; }
    .bt-brand span span { font-size: 11px; }
    .bt-system-tag { display: none; }
    .bt-home .navbar-toggle { border-color: #cfc0dd; background: #f0e8f8; }
    .bt-home .navbar-default .navbar-toggle:hover, .bt-home .navbar-default .navbar-toggle:focus { background: #e6d8f2; }
    .bt-home .navbar-toggle .icon-envelope::before { content: '\2630'; color: var(--bt-purple); font-size: 20px; }
    .bt-home .navbar-nav .open .dropdown-menu > li > a { white-space: normal; padding: 10px 24px; color: #483953; }
    .bt-home-main { margin-top: 22px; padding: 0 16px; }
    .bt-welcome { flex-direction: column-reverse; align-items: flex-start; padding: 24px; gap: 14px; }
    .bt-welcome-logo { width: 145px; height: 145px; align-self: center; }
    .bt-welcome h1 { font-size: 25px; }
    .bt-home-details { grid-template-columns: 1fr; gap: 22px; }
    .bt-home-details > div + div { padding: 22px 0 0; border-left: 0; border-top: 1px solid var(--bt-border); }
    .bt-home-footer { margin: 22px 16px; }
    .bt-home-footer span { display: block; float: none; margin-top: 4px; }
}