* { margin: 0; padding: 0; box-sizing: border-box;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif; }
body { background:#f5f5f5; min-height:100vh; display:flex; align-items:center; justify-content:center; padding:24px; }
a { color:#0a0a0a; }

.saas-container { display:flex; width:100%; max-width:1100px; min-height:640px; background:#fff; border:1px solid #e0e0e0; }
.saas-brand { flex:1.1; background:#0a0a0a; color:#fff; padding:56px 48px; display:flex; flex-direction:column; justify-content:space-between; }
.brand-top { display:flex; flex-direction:column; gap:32px; }
.brand-heading { font-size:38px; font-weight:700; line-height:1.15; letter-spacing:-1px; }
.brand-heading span { color:#888; }
.brand-desc { font-size:16px; line-height:1.6; color:#b0b0b0; max-width:380px; }
.brand-features { display:flex; flex-direction:column; gap:20px; margin-top:8px; }
.brand-feature { display:flex; gap:16px; align-items:flex-start; }
.feature-num { font-size:13px; font-weight:600; color:#666; min-width:24px; padding-top:2px; letter-spacing:.5px; }
.feature-text { font-size:14px; color:#ccc; line-height:1.5; }
.feature-text strong { color:#fff; font-weight:600; display:block; margin-bottom:2px; font-size:15px; }
.brand-footer { font-size:12px; color:#666; letter-spacing:.2px; border-top:1px solid #222; padding-top:24px; }

.saas-form-panel { flex:.9; background:#fff; padding:56px 48px; display:flex; flex-direction:column; justify-content:center; }
.form-header { margin-bottom:36px; }
.form-title { font-size:28px; font-weight:700; color:#0a0a0a; letter-spacing:-.5px; margin-bottom:8px; }
.form-subtitle { font-size:14px; color:#666; line-height:1.5; }
.field-group { margin-bottom:20px; }
.field-label { display:block; font-size:13px; font-weight:500; color:#0a0a0a; margin-bottom:8px; }
.field-input { width:100%; background:#fff; border:1px solid #d4d4d4; border-radius:4px; padding:12px 14px; font-size:15px; color:#0a0a0a; outline:none; }
.field-input::placeholder { color:#9a9a9a; font-size:14px; }
.field-input:focus { border-color:#0a0a0a; }
.submit-btn { width:100%; background:#0a0a0a; color:#fff; border:1px solid #0a0a0a; border-radius:4px; padding:13px 20px; font-size:15px; font-weight:600; cursor:pointer; letter-spacing:.2px; }
.submit-btn:hover { background:#1f1f1f; }
.submit-btn:disabled { background:#777; border-color:#777; cursor:not-allowed; }

.modal-overlay { position:fixed; inset:0; background:rgba(0,0,0,.4); display:flex; align-items:center; justify-content:center; z-index:1000; visibility:hidden; opacity:0; padding:16px; }
.modal-overlay.active { visibility:visible; opacity:1; }
.modal-box { width:100%; max-width:440px; background:#fff; border:1px solid #e0e0e0; border-radius:6px; padding:28px 26px; }
.modal-title { font-size:18px; font-weight:700; color:#0a0a0a; margin-bottom:10px; }
.modal-desc { font-size:14px; color:#444; line-height:1.6; margin-bottom:16px; }
.app-list { display:flex; flex-direction:column; gap:8px; margin-bottom:24px; max-height:260px; overflow-y:auto; padding-right:2px; }
.app-item { display:flex; align-items:center; gap:10px; padding:12px 14px; border:1px solid #d4d4d4; border-radius:4px; cursor:pointer; font-size:14px; color:#0a0a0a; user-select:none; background:#fff; position:relative; }
.app-item:hover { background:#fafafa; }
.app-item.selected { border-color:#0a0a0a; background:#f7f7f7; font-weight:500; }
.app-item input[type=radio] { position:absolute; opacity:0; pointer-events:none; }
.radio-indicator { width:16px; height:16px; border:1.5px solid #b0b0b0; border-radius:50%; background:#fff; display:inline-flex; align-items:center; justify-content:center; flex-shrink:0; }
.app-item input[type=radio]:checked + .radio-indicator { border-color:#0a0a0a; }
.app-item input[type=radio]:checked + .radio-indicator::after { content:''; width:8px; height:8px; border-radius:50%; background:#0a0a0a; }
.app-name { word-break:break-word; }
.modal-actions { display:flex; justify-content:flex-end; gap:10px; }
.modal-btn { min-width:80px; padding:9px 16px; font-size:14px; font-weight:500; border-radius:4px; cursor:pointer; border:1px solid #d4d4d4; background:#fff; color:#0a0a0a; }
.modal-btn:hover { background:#f5f5f5; }
.modal-btn.primary { background:#0a0a0a; color:#fff; border-color:#0a0a0a; }
.modal-btn.primary:hover { background:#1f1f1f; }

.toast { position:fixed; bottom:32px; left:50%; transform:translateX(-50%); background:#0a0a0a; color:#fff; padding:12px 22px; border-radius:4px; font-size:14px; opacity:0; visibility:hidden; z-index:1200; max-width:calc(100vw - 48px); text-align:center; line-height:1.5; }
.toast.show { opacity:1; visibility:visible; }

@media (max-width:860px) {
  .saas-container { flex-direction:column; min-height:auto; }
  .saas-brand { padding:36px 32px; flex:none; }
  .brand-heading { font-size:28px; }
  .saas-form-panel { padding:36px 32px; flex:none; }
}
@media (max-width:480px) {
  body { padding:0; }
  .saas-container { border-left:none; border-right:none; }
  .saas-brand, .saas-form-panel { padding:28px 20px; }
  .form-title { font-size:24px; }
}