:root {
    --surface-1: #fcfcfb;
    --page-plane: #f9f9f7;
    --text-primary: #0b0b0b;
    --text-secondary: #52514e;
    --text-muted: #898781;
    --gridline: #e1e0d9;
    --baseline: #c3c2b7;
    --border-hairline: rgba(11, 11, 11, 0.10);

    --series-1: #2a78d6; /* blue */
    --series-2: #1baf7a; /* aqua */
    --series-3: #eda100; /* yellow */
    --series-4: #008300; /* green */
    --series-5: #4a3aa7; /* violet */
    --series-6: #e34948; /* red */
    --series-7: #e87ba4; /* magenta */
    --series-8: #eb6834; /* orange */

    --seq-100: #cde2fb;
    --seq-250: #86b6ef;
    --seq-450: #2a78d6;
    --seq-600: #184f95;

    --status-good: #0ca30c;
    --status-warning: #fab219;
    --status-serious: #ec835a;
    --status-critical: #d03b3b;
}

body {
    background: var(--page-plane);
    color: var(--text-primary);
}

.app-navbar {
    background: #14213d;
}

.navbar-brand {
    min-width: 0;
    flex-shrink: 1;
    overflow: hidden;
}

.sidebar {
    --bs-offcanvas-width: 240px;
    background: var(--surface-1);
    border-right: 1px solid var(--border-hairline);
}

@media (min-width: 768px) {
    .sidebar {
        min-height: calc(100vh - 56px);
    }
}

.table-responsive {
    margin-bottom: 1rem;
}

.sidebar .nav-link {
    color: var(--text-secondary);
    border-radius: .375rem;
    padding: .5rem .75rem;
}
.sidebar .nav-link:hover {
    color: var(--series-1);
    background: var(--seq-100);
}

/* ---- Stat tiles ---- */
.stat-tile {
    background: var(--surface-1);
    border: 1px solid var(--border-hairline);
    border-radius: .5rem;
    padding: 1rem 1.25rem;
    height: 100%;
}
.stat-tile .stat-label {
    color: var(--text-secondary);
    font-size: .8rem;
    text-transform: uppercase;
    letter-spacing: .03em;
    margin-bottom: .25rem;
}
.stat-tile .stat-value {
    color: var(--text-primary);
    font-size: 2rem;
    font-weight: 600;
    line-height: 1.1;
}
.stat-tile .stat-delta {
    font-size: .85rem;
    margin-top: .25rem;
}
.stat-tile .stat-delta.good { color: var(--status-good); }
.stat-tile .stat-delta.bad { color: var(--status-critical); }
.stat-tile .stat-accent {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: .5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* ---- Chart cards ---- */
.chart-card {
    background: var(--surface-1);
    border: 1px solid var(--border-hairline);
    border-radius: .5rem;
    padding: 1.25rem;
    height: 100%;
}
.chart-card h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}
.chart-card .chart-wrap {
    position: relative;
}

/* ---- Meter (progress toward due date) ---- */
.meter-track {
    background: var(--seq-100);
    border-radius: 999px;
    height: 8px;
    overflow: hidden;
}
.meter-fill {
    height: 100%;
    border-radius: 999px;
}
.meter-fill.good { background: var(--status-good); }
.meter-fill.warning { background: var(--status-warning); }
.meter-fill.critical { background: var(--status-critical); }

/* ---- Book cover placeholder ---- */
.book-cover {
    width: 100%;
    height: 90px;
    border-radius: .375rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: .5rem;
}

.table-hover-flat tbody tr:hover {
    background: var(--seq-100);
}

/* ---- D3 dashboard charts ---- */
.chart-axis-label {
    fill: var(--text-secondary);
    font-size: .75rem;
}
.chart-value-label {
    fill: var(--text-secondary);
    font-size: .75rem;
}
.chart-bar {
    transition: opacity .15s ease;
}
.d3-tooltip {
    position: fixed;
    z-index: 1080;
    background: var(--text-primary);
    color: #fff;
    padding: .35rem .6rem;
    border-radius: .35rem;
    font-size: .8rem;
    pointer-events: none;
    opacity: 0;
    transition: opacity .1s ease;
    max-width: 220px;
}

.filter-bar {
    background: var(--surface-1);
    border: 1px solid var(--border-hairline);
    border-radius: .5rem;
    padding: .75rem 1rem;
}
.filter-chip {
    background: var(--seq-100);
    color: var(--series-1);
    border-radius: 999px;
    padding: .25rem .75rem;
    font-size: .8rem;
    display: inline-flex;
    align-items: center;
    gap: .4rem;
}
.filter-chip button {
    background: none;
    border: none;
    color: inherit;
    line-height: 1;
    padding: 0;
    font-size: 1rem;
}

/* ---- Livro/usuário autocomplete (empréstimos) ---- */
.livro-busca, .usuario-busca {
    position: relative;
}
.livro-busca-resultados, .usuario-busca-resultados {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 1050;
    max-height: 240px;
    overflow-y: auto;
    border-radius: .5rem;
}

/* ---- Empréstimo cards (lista responsiva) ---- */
.emprestimo-card .emprestimo-status {
    flex-shrink: 0;
}