/* ═══════════════════════════════════════════════════
   Catalogo e Preventivi — Stile base, variabili, reset
   ═══════════════════════════════════════════════════ */

:root {
    --primary: #4f46e5;
    --primary-light: #eef2ff;
    --primary-dark: #3730a3;
    --success: #059669;
    --success-light: #ecfdf5;
    --danger: #dc2626;
    --danger-light: #fef2f2;
    --warning: #d97706;
    --warning-light: #fffbeb;
    --info: #0284c7;
    --info-light: #f0f9ff;
    --bg: #f5f6fa;
    --surface: #ffffff;
    --text: #1a1d23;
    --text-secondary: #5f6570;
    --text-muted: #9ca3af;
    --border: #e5e7eb;
    --border-light: #f3f4f6;
    --sidebar-w: 260px;
    --topbar-h: 56px;
    --radius-sm: 4px;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Consolas', monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font-family); font-size: 0.9375rem; line-height: 1.5;
    color: var(--text); background: var(--bg);
    -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; }
table { border-collapse: collapse; width: 100%; }
button, input, select, textarea { font-family: inherit; font-size: inherit; line-height: inherit; }

.app-layout { display: flex; min-height: 100vh; }
.main-content { flex: 1; margin-left: var(--sidebar-w); padding-top: var(--topbar-h); min-height: 100vh; }
.content-area { padding: 24px; max-width: 1400px; }

.topbar {
    position: fixed; top: 0; left: var(--sidebar-w); right: 0; height: var(--topbar-h);
    background: var(--surface); border-bottom: 1px solid var(--border);
    display: flex; align-items: center; padding: 0 24px; z-index: 90; gap: 16px;
}
.topbar h1 { font-size: 1.125rem; font-weight: 600; color: var(--text); }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.btn-toggle-sidebar { display: none; background: none; border: none; cursor: pointer; padding: 4px; color: var(--text); }

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }

.btn {
    display: inline-flex; align-items: center; gap: 6px; padding: 8px 16px;
    border: none; border-radius: var(--radius-sm); font-size: 0.875rem; font-weight: 500;
    cursor: pointer; transition: background 0.15s, box-shadow 0.15s; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #047857; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: #1e1e2d; }
.btn-warning:hover { background: #d97706; }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { background: var(--border-light); }
.btn-sm { padding: 4px 10px; font-size: 0.8125rem; }

.card { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow-sm); padding: 20px; }
.card-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card-header h2 { font-size: 1rem; font-weight: 600; }

.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 0.875rem; }
.alert-success { background: var(--success-light); color: var(--success); }
.alert-danger { background: var(--danger-light); color: var(--danger); }
.alert-warning { background: var(--warning-light); color: var(--warning); }
.alert-info { background: var(--info-light); color: var(--info); }

.loading-container { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px; color: var(--text-muted); gap: 12px; }
.loading-spinner { width: 32px; height: 32px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

.toast-container { position: fixed; top: 16px; right: 16px; z-index: 9999; display: flex; flex-direction: column; gap: 8px; }
.toast { padding: 12px 20px; border-radius: var(--radius); color: #fff; font-size: 0.875rem; box-shadow: var(--shadow-lg); animation: toastIn 0.3s ease; max-width: 360px; }
.toast-success { background: var(--success); }
.toast-danger { background: var(--danger); }
.toast-warning { background: var(--warning); }
.toast-info { background: var(--info); }
@keyframes toastIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

@media (max-width: 768px) {
    .main-content { margin-left: 0; }
    .topbar { left: 0; }
    .content-area { padding: 16px; }
    .btn-toggle-sidebar { display: block; }
}