*{box-sizing:border-box}
html,body{margin:0;padding:0;min-height:100%;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:linear-gradient(180deg,#eef2f9 0%,#f7f9fc 100%);color:#1f2937}
a{text-decoration:none}
.app-shell{min-height:100vh;display:flex}
.sidebar{width:280px;position:fixed;left:0;top:0;bottom:0;background:linear-gradient(180deg,#1f2937 0%,#111827 100%);color:#fff;padding:26px 18px 22px;display:flex;flex-direction:column}
.brand{display:flex;align-items:center;gap:14px;padding:8px 10px 24px}
.brand-mark{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#3b82f6,#2563eb);display:grid;place-items:center;box-shadow:0 10px 24px rgba(37,99,235,.35);font-weight:700}
.brand h1{margin:0;font-size:1.2rem}
.brand p{margin:3px 0 0;color:rgba(255,255,255,.7);font-size:.88rem}
.nav-block{display:flex;flex-direction:column;gap:6px}
.nav-item{display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:14px;color:rgba(255,255,255,.88);font-weight:500;transition:.18s}
.nav-item i{width:18px;text-align:center}
.nav-item:hover{background:rgba(255,255,255,.08);transform:translateX(2px)}
.nav-item.active{background:rgba(37,99,235,.22);box-shadow:inset 0 0 0 1px rgba(96,165,250,.25)}
.nav-item.admin{background:rgba(245,158,11,.12);box-shadow:inset 0 0 0 1px rgba(245,158,11,.16)}
.nav-item.logout{color:#fecaca}
.sidebar-foot{margin-top:auto;padding-top:16px;border-top:1px solid rgba(255,255,255,.08)}
.user-pill{display:inline-flex;align-items:center;gap:10px;background:rgba(255,255,255,.12);padding:10px 12px;border-radius:999px}
.main-panel{margin-left:280px;min-height:100vh;flex:1}
.topbar{height:74px;display:flex;align-items:center;justify-content:space-between;padding:0 28px;background:rgba(255,255,255,.72);backdrop-filter:blur(14px);border-bottom:1px solid rgba(15,23,42,.06);position:sticky;top:0;z-index:10}
.topbar span{font-weight:600}
.whoami{display:flex;align-items:center;gap:10px;background:rgba(255,255,255,.85);border:1px solid #e5e7eb;padding:10px 14px;border-radius:999px;box-shadow:0 6px 16px rgba(15,23,42,.05)}
.whoami i{color:#2563eb}
.content-card{margin:34px 32px;max-width:980px;background:linear-gradient(135deg,#fff 0%,#f8fbff 100%);border:1px solid rgba(37,99,235,.10);border-radius:24px;padding:28px;box-shadow:0 14px 40px rgba(15,23,42,.08)}
.content-card h1{margin:0 0 8px;font-size:1.8rem}
.content-card p{margin:0;color:#6b7280;line-height:1.6}
.option-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:22px}
.option-box{border:1px solid #e5e7eb;border-radius:18px;background:#fff;padding:18px;min-height:150px;display:flex;flex-direction:column;gap:10px;box-shadow:0 8px 18px rgba(15,23,42,.04)}
.option-box i{font-size:1.2rem;color:#2563eb}
.option-box strong{font-size:1rem}
.option-box span{color:#6b7280;line-height:1.5}
.welcome .empty-area{margin-top:24px;min-height:260px;border-radius:20px;border:1.5px dashed #d6dbe6;background:linear-gradient(180deg,rgba(255,255,255,.85) 0%,rgba(248,250,252,.85) 100%);display:flex;align-items:center;justify-content:center;flex-direction:column;text-align:center;padding:24px;color:#6b7280}
.empty-area i{font-size:2rem;color:#93c5fd;margin-bottom:12px}
.empty-area strong{color:#1f2937;margin-bottom:8px}
.page-card{margin:34px 32px;max-width:760px;background:#fff;border:1px solid #e5e7eb;border-radius:24px;padding:28px;box-shadow:0 14px 40px rgba(15,23,42,.08)}
.page-card h2{margin:0 0 8px}
.page-card p{margin:0;color:#6b7280;line-height:1.6}

@media (max-width:920px){
  .sidebar{position:relative;width:100%;inset:auto}
  .main-panel{margin-left:0}
  .app-shell{display:block}
  .topbar{position:relative;height:auto;padding:16px 20px;flex-direction:column;align-items:flex-start;gap:12px}
  .content-card,.page-card{margin:24px 20px 32px}
}