:root{
  --btid-bg:#F8FAFC; --btid-surface:#fff; --btid-text:#0F172A; --btid-muted:#64748b;
  --btid-primary:#0F172A; --btid-accent:#2563EB; --btid-success:#22C55E;
  --btid-warning:#F59E0B; --btid-danger:#EF4444; --btid-border:#e2e8f0;
  --btid-radius:12px; --btid-shadow:0 1px 2px rgba(15,23,42,.04),0 1px 3px rgba(15,23,42,.06);
}
.btid-dark{ --btid-bg:#0b1220; --btid-surface:#111a2e; --btid-text:#e2e8f0; --btid-muted:#94a3b8; --btid-border:#1e293b; --btid-primary:#e2e8f0;}
.btid-app{display:grid;grid-template-columns:240px 1fr;min-height:80vh;background:var(--btid-bg);color:var(--btid-text);font-family:-apple-system,system-ui,Segoe UI,Roboto,sans-serif;border-radius:var(--btid-radius);overflow:hidden;border:1px solid var(--btid-border);}
.btid-sidebar{background:var(--btid-surface);border-right:1px solid var(--btid-border);padding:20px 12px;display:flex;flex-direction:column;gap:8px;}
.btid-brand{font-weight:700;font-size:18px;display:flex;align-items:center;gap:10px;margin-bottom:16px;padding:0 8px;}
.btid-logo{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:8px;background:var(--btid-accent);color:#fff;font-weight:700;}
.btid-sidebar nav{display:flex;flex-direction:column;gap:2px;}
.btid-nav-link{padding:10px 12px;border-radius:8px;color:var(--btid-muted);text-decoration:none;font-size:14px;}
.btid-nav-link:hover{background:rgba(37,99,235,.06);color:var(--btid-text);}
.btid-nav-link.active{background:var(--btid-accent);color:#fff;}
.btid-user{margin-top:auto;font-size:13px;color:var(--btid-muted);padding:8px 12px;border-top:1px solid var(--btid-border);}
.btid-main{padding:24px;display:flex;flex-direction:column;gap:20px;}
.btid-topbar{display:flex;justify-content:space-between;align-items:center;}
.btid-topbar h1{margin:0;font-size:22px;font-weight:600;}
.btid-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;}
.btid-stat,.btid-card{background:var(--btid-surface);border:1px solid var(--btid-border);border-radius:var(--btid-radius);padding:18px;box-shadow:var(--btid-shadow);}
.btid-stat span{color:var(--btid-muted);font-size:13px;display:block;margin-bottom:6px;}
.btid-stat strong{font-size:22px;}
.btid-row{display:grid;grid-template-columns:1.4fr 1fr;gap:16px;}
.btid-card h3{margin:0 0 12px;font-size:15px;font-weight:600;}
.btid-table{width:100%;border-collapse:collapse;font-size:13px;}
.btid-table th,.btid-table td{padding:8px 6px;border-bottom:1px solid var(--btid-border);text-align:left;}
.btid-plan-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px;}
.btid-plan{border:1px solid var(--btid-border);border-radius:var(--btid-radius);padding:16px;background:var(--btid-bg);}
.btid-plan h4{margin:0 0 4px;}
.btid-plan small{color:var(--btid-muted);}
.btid-plan input{width:100%;margin:8px 0;padding:8px;border:1px solid var(--btid-border);border-radius:8px;background:var(--btid-surface);color:var(--btid-text);}
.btid-btn{background:var(--btid-accent);color:#fff;border:0;padding:10px 14px;border-radius:8px;font-weight:500;cursor:pointer;}
.btid-btn-ghost{background:transparent;border:1px solid var(--btid-border);color:var(--btid-text);padding:6px 10px;border-radius:8px;cursor:pointer;}
form label{display:block;margin:10px 0;font-size:13px;color:var(--btid-muted);}
form input,form select,form textarea{display:block;width:100%;margin-top:4px;padding:9px;border:1px solid var(--btid-border);border-radius:8px;background:var(--btid-surface);color:var(--btid-text);font-size:14px;}
.btid-pill{padding:2px 8px;border-radius:999px;font-size:11px;background:#e2e8f0;}
.btid-pending{background:#fef3c7;color:#92400e;} .btid-approved{background:#dcfce7;color:#166534;} .btid-rejected{background:#fee2e2;color:#991b1b;}
.btid-login-required{padding:24px;text-align:center;background:var(--btid-surface,#fff);border:1px solid #e2e8f0;border-radius:12px;}
.btid-menu-toggle{display:none;font-size:22px;line-height:1;padding:4px 10px;}
.btid-sidebar-backdrop{display:none;}
@media(max-width:780px){
  .btid-app{grid-template-columns:1fr;position:relative;}
  .btid-row{grid-template-columns:1fr;}
  .btid-menu-toggle{display:inline-flex;align-items:center;justify-content:center;}
  .btid-logout-desktop{display:none;}
  .btid-sidebar{position:fixed;top:0;right:0;bottom:0;left:auto;width:78%;max-width:300px;height:100vh;z-index:1000;transform:translateX(100%);transition:transform .25s ease;border-right:0;border-left:1px solid var(--btid-border);box-shadow:-8px 0 24px rgba(0,0,0,.18);overflow-y:auto;}
  .btid-app.btid-menu-open .btid-sidebar{transform:translateX(0);}
  .btid-sidebar-backdrop{display:block;position:fixed;inset:0;background:rgba(0,0,0,.4);z-index:999;opacity:0;pointer-events:none;transition:opacity .2s ease;}
  .btid-app.btid-menu-open .btid-sidebar-backdrop{opacity:1;pointer-events:auto;}
  .btid-sidebar-backdrop[hidden]{display:block;}
}

/* Login box */
.btid-login-box{max-width:420px;margin:48px auto;padding:32px;border-radius:14px;background:var(--btid-card,#fff);box-shadow:0 10px 40px rgba(0,0,0,.08);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;}
.btid-login-box h2{margin:0 0 18px;font-size:22px;font-weight:600;text-align:center;}
.btid-login-box .login-username,.btid-login-box .login-password{margin-bottom:14px;}
.btid-login-box label{display:block;font-size:13px;font-weight:500;margin-bottom:6px;}
.btid-login-box input[type=text],.btid-login-box input[type=password]{width:100%;padding:10px 12px;border:1px solid #d8dde5;border-radius:8px;font-size:14px;box-sizing:border-box;}
.btid-login-box .login-submit input[type=submit]{width:100%;padding:11px 16px;background:#2563eb;color:#fff;border:0;border-radius:8px;font-weight:600;cursor:pointer;font-size:14px;}
.btid-login-box .login-submit input[type=submit]:hover{background:#1d4ed8;}
.btid-login-box .login-remember{font-size:13px;margin:8px 0 14px;}
.btid-login-links{text-align:center;font-size:13px;margin-top:16px;}
.btid-login-links a{color:#2563eb;text-decoration:none;}

/* Quick actions */
.btid-quick-actions{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.btid-action{display:flex;align-items:center;gap:14px;padding:18px 20px;border:1px solid var(--btid-border,#e5e7eb);border-radius:14px;background:var(--btid-card,#fff);cursor:pointer;text-align:left;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}
.btid-action:hover{transform:translateY(-2px);box-shadow:0 10px 24px -12px rgba(0,0,0,.18);border-color:#2563EB}
.btid-action-icon{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-size:22px;font-weight:700;color:#fff;background:#2563EB;flex-shrink:0}
.btid-action-withdraw .btid-action-icon{background:#0EA5E9}
.btid-action-text{display:flex;flex-direction:column;line-height:1.2}
.btid-action-text strong{font-size:16px}
.btid-action-text small{color:#6b7280;font-size:12px;margin-top:2px}
@media(max-width:640px){.btid-quick-actions{grid-template-columns:1fr}}

/* Form pages */
.btid-page{animation:btidFade .25s ease}
@keyframes btidFade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.btid-back{background:none;border:0;color:#2563EB;cursor:pointer;font-weight:600;margin-bottom:14px;padding:6px 0;font-size:14px}
.btid-back:hover{text-decoration:underline}
.btid-form-card{max-width:560px}
.btid-muted{color:#6b7280;font-size:13px;margin:-4px 0 16px}
.btid-form .btid-field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.btid-form .btid-field label{font-size:13px;font-weight:600;color:#374151}
.btid-form .btid-field label small{font-weight:400;color:#9ca3af}
.btid-form input,.btid-form select,.btid-form textarea{padding:10px 12px;border:1px solid #e5e7eb;border-radius:10px;font:inherit;background:#fff;outline:none;transition:border-color .15s}
.btid-form input:focus,.btid-form select:focus,.btid-form textarea:focus{border-color:#2563EB;box-shadow:0 0 0 3px rgba(37,99,235,.12)}
.btid-form-actions{display:flex;gap:10px;justify-content:flex-end;margin-top:18px}
.btid-dark .btid-action{background:#0f172a;border-color:#1f2937}
.btid-dark .btid-form input,.btid-dark .btid-form select,.btid-dark .btid-form textarea{background:#0f172a;border-color:#1f2937;color:#e5e7eb}
.btid-dark .btid-muted,.btid-dark .btid-action-text small{color:#9ca3af}
.btid-dark .btid-form .btid-field label{color:#cbd5e1}

/* Logo + Logout */
.btid-logo-img{width:32px;height:32px;border-radius:8px;object-fit:cover;background:var(--btid-surface);}
.btid-user{display:flex;flex-direction:column;gap:6px;}
.btid-user-name{font-size:13px;color:var(--btid-text);font-weight:600;}
.btid-logout{font-size:12px;color:var(--btid-muted);text-decoration:none;}
.btid-logout:hover{color:var(--btid-danger);}
.btid-topbar-actions{display:flex;gap:8px;align-items:center;}
.btid-topbar-actions a.btid-btn-ghost{text-decoration:none;font-size:13px;}

/* Wallet address box */
.btid-wallet-address{display:flex;gap:8px;align-items:center;padding:10px 12px;border:1px dashed var(--btid-border);border-radius:10px;background:var(--btid-bg);}
.btid-wallet-address code{flex:1;font-family:ui-monospace,Menlo,monospace;font-size:13px;word-break:break-all;color:var(--btid-text);background:transparent;}

/* Modal */
.btid-modal{position:fixed;inset:0;z-index:9999;display:flex;align-items:center;justify-content:center;}
.btid-modal[hidden]{display:none;}
.btid-modal-backdrop{position:absolute;inset:0;background:rgba(15,23,42,.55);backdrop-filter:blur(2px);}
.btid-modal-card{position:relative;background:var(--btid-surface);color:var(--btid-text);border-radius:14px;padding:24px;max-width:520px;width:92%;box-shadow:0 20px 60px rgba(0,0,0,.3);border:1px solid var(--btid-border);}
.btid-modal-close{position:absolute;top:10px;right:12px;background:transparent;border:0;font-size:22px;cursor:pointer;color:var(--btid-muted);}
.btid-invest-choices{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin:16px 0;}
@media(max-width:520px){.btid-invest-choices{grid-template-columns:1fr;}}

/* Dark mode — balance text + transaction history contrast */
.btid-dark .btid-stat strong,.btid-dark .btid-card h3,.btid-dark .btid-user-name{color:#f1f5f9;}
.btid-dark .btid-table{color:#e2e8f0;}
.btid-dark .btid-table th{color:#cbd5e1;font-weight:600;background:rgba(255,255,255,.03);}
.btid-dark .btid-table td{color:#e2e8f0;}
.btid-dark .btid-table tbody tr:hover{background:rgba(37,99,235,.08);}
.btid-dark .btid-table th,.btid-dark .btid-table td{border-bottom-color:#1e293b;}
.btid-dark .btid-pill{background:#1e293b;color:#cbd5e1;}
.btid-dark .btid-pending{background:rgba(245,158,11,.18);color:#fbbf24;}
.btid-dark .btid-approved{background:rgba(34,197,94,.18);color:#4ade80;}
.btid-dark .btid-rejected{background:rgba(239,68,68,.18);color:#f87171;}
.btid-dark .btid-wallet-address{background:#0b1220;border-color:#1e293b;}
.btid-dark .btid-wallet-address code{color:#e2e8f0;}
.btid-dark .btid-modal-card{background:#111a2e;border-color:#1e293b;}
.btid-dark .btid-plan{background:#0b1220;border-color:#1e293b;}
.btid-dark .btid-plan small,.btid-dark .btid-plan p{color:#cbd5e1;}

/* === Auth (Login + Register) === */
.btid-auth-shell{min-height:60vh;display:flex;align-items:center;justify-content:center;padding:32px 16px;}
.btid-auth-card{width:100%;max-width:440px;background:var(--btid-card,#fff);border:1px solid #e2e8f0;border-radius:16px;padding:32px;box-shadow:0 20px 60px rgba(15,23,42,.08);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;}
.btid-auth-brand{display:flex;align-items:center;gap:10px;justify-content:center;margin-bottom:20px;font-size:18px;}
.btid-auth-brand img{height:32px;width:auto;}
.btid-auth-tabs{display:flex;background:#f1f5f9;border-radius:10px;padding:4px;margin-bottom:20px;gap:4px;}
.btid-auth-tab{flex:1;padding:9px 12px;border:0;background:transparent;border-radius:8px;cursor:pointer;font-weight:600;font-size:14px;color:#475569;}
.btid-auth-tab.active{background:#fff;color:#0f172a;box-shadow:0 1px 3px rgba(0,0,0,.08);}
.btid-auth-form .btid-field{margin-bottom:14px;}
.btid-auth-form label{display:block;font-size:13px;font-weight:500;margin-bottom:6px;color:#334155;}
.btid-auth-form input[type=text],.btid-auth-form input[type=email],.btid-auth-form input[type=password]{width:100%;padding:11px 13px;border:1px solid #d8dde5;border-radius:9px;font-size:14px;box-sizing:border-box;background:#fff;}
.btid-auth-form input:focus{outline:none;border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.15);}
.btid-remember{display:flex;align-items:center;gap:8px;font-size:13px;color:#475569;margin:6px 0 14px;}
.btid-btn-block{width:100%;padding:12px 16px;background:#2563eb;color:#fff;border:0;border-radius:9px;font-weight:600;cursor:pointer;font-size:14px;}
.btid-btn-block:hover{background:#1d4ed8;}
.btid-auth-hint{font-size:12px;color:#64748b;text-align:center;margin-top:14px;}
.btid-login-links{text-align:center;font-size:13px;margin-top:14px;}
.btid-login-links a{color:#2563eb;text-decoration:none;}

/* Security tab */
.btid-sep{border:0;border-top:1px solid #e2e8f0;margin:22px 0;}
.btid-tips{margin:8px 0 0;padding-left:18px;color:#475569;font-size:14px;}
.btid-tips li{margin-bottom:6px;}

/* Dark mode auth */
.btid-dark .btid-auth-card{background:#0f172a;border-color:#1e293b;color:#e2e8f0;}
.btid-dark .btid-auth-tabs{background:#1e293b;}
.btid-dark .btid-auth-tab{color:#94a3b8;}
.btid-dark .btid-auth-tab.active{background:#0f172a;color:#f1f5f9;}
.btid-dark .btid-auth-form label{color:#cbd5e1;}
.btid-dark .btid-auth-form input{background:#1e293b;border-color:#334155;color:#f1f5f9;}
.btid-dark .btid-tips{color:#cbd5e1;}
.btid-dark .btid-sep{border-top-color:#1e293b;}