:root { --sidebar:#121826; --accent:#4f46e5; --bg:#f4f6fb; --card:#ffffff; --text:#1f2937; }
* { box-sizing: border-box; }
body { margin:0; background:var(--bg); color:var(--text); font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
.app-shell { display:flex; min-height:100vh; }
.sidebar { width:260px; background:var(--sidebar); color:#fff; padding:24px 18px; position:fixed; inset:0 auto 0 0; }
.brand { font-weight:800; font-size:1.2rem; margin-bottom:16px; }
.sidebar-logo-wrapper { display:flex; justify-content:center; align-items:center; margin:0 0 20px; padding:0 4px; }
.sidebar-logo { width:100%; max-width:200px; height:auto; max-height:80px; object-fit:contain; display:block; }
.sidebar .nav-link { color:#cbd5e1; border-radius:12px; margin-bottom:6px; padding:10px 12px; }
.sidebar .nav-link:hover { color:#fff; background:rgba(255,255,255,.08); }
.stock-badge { float:right; min-width:24px; padding:2px 7px; border-radius:999px; background:#ef4444; color:#fff; text-align:center; font-size:.75rem; font-weight:700; }
.main-content { margin-left:260px; width:calc(100% - 260px); padding:24px; }
.topbar { background:#fff; border-radius:18px; padding:18px 22px; margin-bottom:24px; box-shadow:0 10px 30px rgba(15,23,42,.05); }
.topbar h1 { margin:0; font-size:1.35rem; }
.topbar span { color:#64748b; }
.content-card, .panel { background:var(--card); border-radius:18px; padding:22px; box-shadow:0 10px 30px rgba(15,23,42,.06); }
.panel { padding:18px; }
.table { vertical-align:middle; }
.btn-primary { background:var(--accent); border-color:var(--accent); }
.form-control, .form-select { border-radius:10px; }
.login-screen { min-height:100vh; display:flex; align-items:center; justify-content:center; padding:24px; }
.login-card { width:100%; max-width:440px; }
.login-brand { text-align:center; margin-bottom:1.5rem; }
.login-brand img { display:block; margin:0 auto; }
.login-brand h1 { margin:12px 0 4px; font-size:1.5rem; }
.login-brand p { margin:0; color:#64748b; }
@media (max-width: 900px) { .sidebar { position:static; width:100%; } .app-shell { display:block; } .main-content { width:100%; margin-left:0; padding:14px; } }