:root{
    --bg:#edf2f7;
    --panel:#ffffff;
    --panel-2:#f7f9fc;
    --ink:#142033;
    --muted:#6a788d;
    --line:#d9e2ed;
    --brand:#132337;
    --brand-2:#1a3150;
    --brand-3:#28456d;
    --accent:#0f4c81;
    --danger:#b42318;
    --shadow:0 18px 40px rgba(18,34,55,.12);
    --radius:20px;
    --sidebar:118px;
}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:inherit}

.login-page{display:grid;place-items:center;min-height:100vh;padding:24px;background:linear-gradient(145deg,#f4f7fb 0%,#e7edf5 100%)}
.login-shell{width:min(430px,100%)}
.login-card{background:var(--panel);border:1px solid var(--line);border-radius:28px;padding:30px;box-shadow:var(--shadow)}
.brand-mark{display:inline-flex;align-items:center;justify-content:center;min-width:96px;height:32px;padding:0 12px;border-radius:999px;background:#eef4fb;color:var(--accent);font-weight:900;letter-spacing:.08em;font-size:13px;margin-bottom:16px}
.login-card h1{margin:0 0 8px;font-size:30px;letter-spacing:-.02em}
.login-card p{margin:0 0 22px;color:var(--muted);line-height:1.5}
.login-form{display:grid;gap:14px}
.login-form label{display:grid;gap:7px;font-size:13px;font-weight:700;color:#27384f}
.login-form input{height:48px;border:1px solid var(--line);border-radius:14px;padding:0 14px;font-size:16px;background:#fff}
.login-form input:focus{outline:none;border-color:#97afca;box-shadow:0 0 0 4px rgba(15,76,129,.08)}
.login-form button{height:50px;border:0;border-radius:15px;background:var(--brand);color:#fff;font-weight:800;font-size:15px;cursor:pointer}
.login-form button:hover{background:var(--brand-2)}
.install-note{margin-top:16px;padding-top:14px;border-top:1px solid var(--line);font-size:12px;line-height:1.45;color:var(--muted)}
.alert{padding:12px 13px;border-radius:13px;margin-bottom:16px;font-weight:700;font-size:14px}
.alert-error{background:#fff1f0;color:var(--danger);border:1px solid #ffd1cc}

.workspace-page{overflow:hidden}
.workspace-shell{height:100vh;display:grid;grid-template-columns:var(--sidebar) 1fr;gap:0}
.side-nav{background:linear-gradient(180deg,var(--brand) 0%,#0f1d2f 100%);color:#fff;padding:16px 12px;display:flex;flex-direction:column;align-items:stretch;gap:14px;min-width:0}
.nav-top{display:flex;justify-content:center}
.nav-brand{text-decoration:none;display:flex;flex-direction:column;align-items:center;gap:8px;padding:4px 0 12px}
.brand-badge{width:42px;height:42px;border-radius:14px;background:rgba(255,255,255,.12);display:grid;place-items:center;font-weight:900;font-size:22px;letter-spacing:.04em}
.brand-copy{display:flex;flex-direction:column;align-items:center;gap:2px}
.brand-copy strong{font-size:13px;letter-spacing:.08em}
.brand-copy small{font-size:11px;color:#b8c5d5}
.nav-links{display:grid;gap:10px}
.nav-link{text-decoration:none;display:flex;flex-direction:column;align-items:center;gap:7px;padding:12px 8px;border-radius:18px;border:1px solid transparent;color:#dbe5f1;transition:.16s ease}
.nav-link:hover{background:rgba(255,255,255,.08)}
.nav-link.active{background:#fff;color:var(--ink);box-shadow:0 10px 22px rgba(0,0,0,.14)}
.nav-icon{width:44px;height:44px;border-radius:14px;background:rgba(255,255,255,.1);display:grid;place-items:center;font-size:12px;font-weight:900;letter-spacing:.05em}
.nav-link.active .nav-icon{background:#eef3f8;color:var(--accent)}
.nav-text{font-size:12px;font-weight:800;line-height:1.2;text-align:center}
.nav-footer{margin-top:auto;display:grid;gap:10px}
.nav-user{padding:10px 8px;border-radius:16px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.08);display:grid;gap:4px;text-align:center}
.nav-user strong{font-size:12px;line-height:1.2}
.nav-user span{font-size:11px;color:#c2cfde}
.logout{text-decoration:none;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);padding:12px 10px;border-radius:14px;text-align:center;font-weight:800;color:#fff;font-size:13px}
.workspace-main{min-width:0;height:100vh;background:var(--bg)}
.frame-wrap{height:100%;padding:12px}
.frame-wrap iframe{width:100%;height:100%;border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:0 8px 28px rgba(20,32,51,.10)}
.frame-error{max-width:680px;margin:40px auto;background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:var(--shadow)}
.frame-error h2{margin-top:0}

@media (max-width: 1024px){
    :root{--sidebar:104px}
    .frame-wrap{padding:10px}
    .frame-wrap iframe{border-radius:18px}
}

@media (max-width: 860px){
    .workspace-shell{grid-template-columns:1fr;grid-template-rows:84px 1fr}
    .side-nav{padding:10px 10px 8px;display:grid;grid-template-columns:1fr;gap:8px}
    .nav-top{display:none}
    .nav-user{display:none}
    .nav-footer{display:none}
    .nav-links{display:grid;grid-auto-flow:column;grid-auto-columns:minmax(74px,1fr);gap:8px;overflow-x:auto;padding-bottom:2px}
    .nav-link{padding:10px 6px;border-radius:16px;min-height:66px}
    .nav-icon{width:36px;height:36px;border-radius:12px;font-size:11px}
    .nav-text{font-size:11px}
    .workspace-main{height:auto;min-height:0}
    .frame-wrap{height:calc(100vh - 84px);padding:8px; padding-bottom:calc(8px + env(safe-area-inset-bottom));}
    .frame-wrap iframe{border-radius:16px}
}

@media (max-width: 540px){
    .login-page{padding:18px}
    .login-card{padding:22px;border-radius:22px}
    .login-card h1{font-size:28px}
    .workspace-shell{grid-template-rows:78px 1fr}
    .nav-links{grid-auto-columns:minmax(68px,1fr)}
    .frame-wrap{height:calc(100vh - 78px)}
}