:root {
    --brand-dark: #2b2416;
    --brand-gold: #c9a227;
    --brand-gold-light: #e8c85c;
    --bg: #f4f5f7;
    --card-bg: #ffffff;
    --text-main: #1f2430;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --radius: 14px;
    --sidebar-w: 260px;
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text-main);
    margin: 0;
}

.app-shell { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar {
    width: var(--sidebar-w);
    background: linear-gradient(180deg, #26200f 0%, #3a2f16 100%);
    color: #f4ede0;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; bottom: 0; left: 0;
    z-index: 1040;
    transition: transform .25s ease;
}
.sidebar-brand { display: flex; align-items: center; gap: .75rem; padding: 1.5rem 1.25rem; }
.brand-mark {
    width: 42px; height: 42px; border-radius: 12px;
    background: linear-gradient(135deg, var(--brand-gold-light), var(--brand-gold));
    display: flex; align-items: center; justify-content: center;
    color: #2b2416; font-size: 1.2rem;
}
.brand-title { font-weight: 700; font-size: 1rem; line-height: 1.1; }
.brand-sub { font-size: .75rem; color: #c9bfa4; }

.sidebar-nav { flex: 1; padding: .5rem .75rem; display: flex; flex-direction: column; gap: .25rem; }
.sidebar-nav .nav-link, .sidebar-footer .nav-link {
    color: #e7e0cf; padding: .65rem .9rem; border-radius: 10px;
    display: flex; align-items: center; gap: .65rem; font-size: .92rem; font-weight: 500;
}
.sidebar-nav .nav-link i, .sidebar-footer .nav-link i { width: 18px; text-align: center; }
.sidebar-nav .nav-link:hover { background: rgba(255,255,255,.08); color: #fff; }
.sidebar-nav .nav-link.active { background: linear-gradient(135deg, var(--brand-gold-light), var(--brand-gold)); color: #2b2416; font-weight: 700; }
.sidebar-footer { padding: .75rem; border-top: 1px solid rgba(255,255,255,.08); }

.sidebar-backdrop { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 1035; }

/* Main */
.main-area { flex: 1; margin-left: var(--sidebar-w); min-width: 0; }
.topbar {
    display: flex; align-items: center; gap: 1rem;
    background: var(--card-bg); border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem; position: sticky; top: 0; z-index: 1020;
}
.topbar-title { font-size: 1.15rem; font-weight: 700; margin: 0; flex: 1; }
.btn-icon { border: none; background: transparent; font-size: 1.4rem; color: var(--text-main); }
.user-chip { font-size: .85rem; color: var(--text-muted); display: flex; align-items: center; gap: .4rem; }
.content { padding: 1.5rem; max-width: 1200px; }

/* Cards */
.card-soft {
    background: var(--card-bg); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 1.25rem;
}
.stat-card { border-radius: var(--radius); padding: 1.25rem; color: #fff; position: relative; overflow: hidden; }
.stat-card .stat-value { font-size: 1.7rem; font-weight: 800; }
.stat-card .stat-label { font-size: .82rem; opacity: .9; }
.stat-card i { position: absolute; right: 1rem; top: 1rem; font-size: 1.8rem; opacity: .35; }
.stat-gold { background: linear-gradient(135deg, #d9ae2b, #a9791c); }
.stat-dark { background: linear-gradient(135deg, #362c17, #1f1a0f); }
.stat-green { background: linear-gradient(135deg, #1f9d55, #147a41); }
.stat-blue { background: linear-gradient(135deg, #2563eb, #1d4ed8); }

.table-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.table-card table { margin-bottom: 0; }
.table-card thead th { background: #faf9f6; font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--text-muted); border-bottom: 1px solid var(--border); }

.badge-status-draft { background: #e5e7eb; color: #374151; }
.badge-status-sent { background: #dbeafe; color: #1e40af; }
.badge-status-paid { background: #dcfce7; color: #166534; }

.btn-brand { background: linear-gradient(135deg, var(--brand-gold-light), var(--brand-gold)); border: none; color: #2b2416; font-weight: 600; }
.btn-brand:hover { color: #1a1608; opacity: .92; }

.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(160deg, #26200f, #4a3c1c); padding: 1.5rem; }
.auth-card { background: #fff; border-radius: 18px; padding: 2.25rem; width: 100%; max-width: 400px; box-shadow: 0 20px 60px rgba(0,0,0,.35); }

@media (max-width: 991.98px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .sidebar-backdrop.show { display: block; }
    .main-area { margin-left: 0; }
    .content { padding: 1rem; }
}