:root{--os-accent:#2563eb;--os-bg:#f3f6fb;--os-card:#ffffff;--os-text:#0f172a;--os-muted:#64748b;--os-line:#e2e8f0;--os-side1:#07111f;--os-side2:#111827;--os-success:#16a34a;--os-danger:#dc2626;--os-warning:#f59e0b;--os-radius:22px;--os-shadow:0 18px 45px rgba(15,23,42,.10)}
html[data-theme="dark"]{--os-bg:#0b1020;--os-card:#111827;--os-text:#f8fafc;--os-muted:#94a3b8;--os-line:#1f2937;--os-side1:#020617;--os-side2:#0f172a}
html[data-theme="green"]{--os-accent:#16a34a;--os-side1:#052e16;--os-side2:#064e3b}
html[data-theme="purple"]{--os-accent:#7c3aed;--os-side1:#2e1065;--os-side2:#581c87}
html[data-theme="minimal"]{--os-accent:#334155;--os-side1:#1e293b;--os-side2:#334155;--os-bg:#f8fafc}
*{box-sizing:border-box}body.os-shell{background:radial-gradient(circle at top right,rgba(37,99,235,.12),transparent 34%),var(--os-bg);color:var(--os-text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Arial;margin:0}.sidebar{width:304px;background:linear-gradient(180deg,var(--os-side1),var(--os-side2));min-height:100vh;position:fixed;color:white;overflow-y:auto;box-shadow:12px 0 34px rgba(2,6,23,.22);z-index:20}.brand{padding:22px;border-bottom:1px solid rgba(255,255,255,.08)}.brand b{font-size:17px}.brand-logo{width:48px;height:48px;border-radius:18px;background:linear-gradient(135deg,var(--os-accent),#22c55e);display:flex;align-items:center;justify-content:center;font-weight:800;box-shadow:0 12px 28px rgba(0,0,0,.24);overflow:hidden}.brand-logo img{width:100%;height:100%;object-fit:contain;background:white}.nav-group{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:rgba(255,255,255,.42);padding:18px 18px 6px}.nav-link{color:#cbd5e1;border-radius:14px;margin:3px 12px;padding:10px 14px;display:flex;align-items:center}.nav-link:hover,.nav-link.active{background:linear-gradient(90deg,rgba(255,255,255,.15),rgba(255,255,255,.06));color:#fff;box-shadow:inset 3px 0 0 var(--os-accent)}.content{margin-left:304px;min-height:100vh}.topbar{min-height:78px;background:rgba(255,255,255,.76);backdrop-filter:blur(16px);border-bottom:1px solid var(--os-line);display:flex;align-items:center;justify-content:space-between;padding:16px 28px;position:sticky;top:0;z-index:15}.top-actions{display:flex;align-items:center;gap:10px}.page-wrap{padding:28px}.card,.cardx,.stat{background:var(--os-card)!important;color:var(--os-text);border:1px solid var(--os-line)!important;border-radius:var(--os-radius)!important;box-shadow:var(--os-shadow)!important}.stat{padding:20px;position:relative;overflow:hidden}.stat:after{content:"";position:absolute;inset:auto -20px -35px auto;width:110px;height:110px;border-radius:50%;background:rgba(37,99,235,.10)}.stat .icon,.premium-icon{width:48px;height:48px;border-radius:18px;background:color-mix(in srgb,var(--os-accent) 15%, white);display:flex;align-items:center;justify-content:center;color:var(--os-accent);font-size:22px}.btn-os{background:linear-gradient(135deg,var(--os-accent),#06b6d4);border:0;color:#fff;border-radius:14px;padding:.65rem 1rem;box-shadow:0 10px 22px color-mix(in srgb,var(--os-accent) 28%, transparent)}.btn-os:hover{color:#fff;filter:brightness(.95)}.form-control,.form-select{border-radius:14px;border-color:var(--os-line);background:var(--os-card);color:var(--os-text)}.table{color:var(--os-text);vertical-align:middle}.badge-soft{background:color-mix(in srgb,var(--os-accent) 12%, white);color:var(--os-accent);border-radius:999px}.money{font-variant-numeric:tabular-nums}.small-muted{font-size:12px;color:var(--os-muted)}.os-kpi{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.invoice-template-card{border:2px solid var(--os-line);border-radius:18px;padding:16px;cursor:pointer}.invoice-template-card input:checked+div{outline:3px solid var(--os-accent);border-radius:14px}.pulse{position:absolute;right:8px;top:8px;width:9px;height:9px;border-radius:999px;background:#ef4444;box-shadow:0 0 0 6px rgba(239,68,68,.14)}.os-mobile-bar{display:none}@media(max-width:1050px){.sidebar{position:relative;width:100%;min-height:auto}.content{margin-left:0}.topbar{align-items:flex-start;flex-direction:column}.top-actions{width:100%;flex-wrap:wrap}.os-kpi{grid-template-columns:repeat(2,1fr)}.page-wrap{padding:18px}.os-mobile-bar{display:flex;position:fixed;bottom:0;left:0;right:0;background:var(--os-card);border-top:1px solid var(--os-line);z-index:50;justify-content:space-around;padding:8px}.os-mobile-bar a{font-size:11px;text-decoration:none;color:var(--os-muted);display:flex;flex-direction:column;align-items:center}.os-mobile-bar i{font-size:18px;color:var(--os-accent)}}@media(max-width:640px){.os-kpi{grid-template-columns:1fr}.sidebar nav{max-height:360px}.brand-logo{width:42px;height:42px}}