:root {
    --ink: #18202a;
    --muted: #667085;
    --line: #d8dee8;
    --panel: #ffffff;
    --surface: #f4f7fb;
    --primary: #176c5f;
    --primary-dark: #105249;
    --accent: #d98f2b;
}

body {
    background: var(--surface);
    color: var(--ink);
    min-width: 320px;
}

.topbar {
    background: var(--panel);
    border-bottom: 1px solid var(--line);
}

.navbar-brand {
    white-space: normal;
    line-height: 1.25;
}

.page-title {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    margin: 0;
    overflow-wrap: anywhere;
}

.section-title {
    font-size: 1.2rem;
    margin-bottom: 1rem;
}

.login-shell {
    min-height: calc(100vh - 140px);
    display: grid;
    place-items: center;
    padding: 1rem 0;
}

.login-panel {
    width: min(100%, 420px);
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: 0 18px 50px rgba(24, 32, 42, .08);
}

.login-panel h1 {
    font-size: 1.6rem;
    margin-bottom: 1.5rem;
}

.btn-primary {
    --bs-btn-bg: var(--primary);
    --bs-btn-border-color: var(--primary);
    --bs-btn-hover-bg: var(--primary-dark);
    --bs-btn-hover-border-color: var(--primary-dark);
}

.stats-grid,
.customer-grid,
.bill-grid {
    display: grid;
    gap: 1rem;
}

.stats-grid {
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
}

.stat-card,
.customer-card,
.bill-card,
.balance-card {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
}

.stat-card {
    padding: 1.2rem;
}

.stat-card span,
.balance-card span,
.bill-card dt {
    color: var(--muted);
    font-size: .9rem;
}

.stat-card strong,
.balance-card strong {
    display: block;
    font-size: 1.8rem;
    margin-top: .35rem;
}

.search-bar {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: .75rem;
}

.page-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .75rem;
}

.page-actions form {
    margin: 0;
}

.report-filter {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    display: grid;
    grid-template-columns: minmax(160px, 1fr) minmax(160px, 1fr) auto;
    gap: 1rem;
    align-items: end;
    padding: 1rem;
}

.report-filter-actions {
    display: flex;
    gap: .5rem;
}

.customer-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.customer-card,
.bill-card {
    padding: 1rem;
}

.customer-card h2,
.bill-card h3 {
    font-size: 1.05rem;
    margin: 0;
    line-height: 1.35;
}

.customer-card p,
.bill-card p,
.balance-card p {
    color: var(--muted);
    margin: .35rem 0 0;
}

.customer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    margin: 1rem 0;
}

.customer-meta span {
    background: #eef5f3;
    color: var(--primary-dark);
    border-radius: 999px;
    padding: .25rem .6rem;
    font-size: .85rem;
}

.link-row {
    display: grid;
    grid-template-columns: 1fr auto auto;
    gap: .5rem;
}

.link-row input {
    min-width: 0;
}

.portal-header {
    background: var(--panel);
    border-bottom: 3px solid var(--accent);
    border-radius: 8px;
    padding: 1.25rem;
    overflow: hidden;
}

.balance-card {
    padding: 1.25rem;
}

.bill-grid {
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.bill-card dl {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: .75rem;
    margin: 1rem 0;
}

.bill-card dd {
    margin: .25rem 0 0;
    font-weight: 700;
    overflow-wrap: anywhere;
}

.bill-actions,
.pdf-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
}

.bill-actions .btn {
    min-width: 138px;
}

.pdf-toolbar {
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.pdf-frame {
    width: 100%;
    height: min(78vh, 900px);
    min-height: 520px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--panel);
}

.empty-state {
    background: var(--panel);
    border: 1px dashed var(--line);
    border-radius: 8px;
    color: var(--muted);
    padding: 2rem;
    text-align: center;
}

.report-chart-grid,
.report-list-grid {
    display: grid;
    gap: 1rem;
}

.report-chart-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.report-list-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.report-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: 1rem;
    min-width: 0;
}

.report-panel h2 {
    font-size: 1.05rem;
    margin-bottom: 1rem;
}

.chart-box {
    height: 330px;
    min-width: 0;
}

.report-card-list {
    display: grid;
    gap: .75rem;
}

.report-row-card {
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: .85rem;
    display: grid;
    gap: .75rem;
}

.report-row-card h3 {
    font-size: 1rem;
    margin: 0;
    overflow-wrap: anywhere;
}

.report-row-card p {
    color: var(--muted);
    margin: .25rem 0 0;
}

.report-row-card dl {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .5rem;
    margin: 0;
}

.report-row-card dt {
    color: var(--muted);
    font-size: .82rem;
}

.report-row-card dd {
    font-weight: 700;
    margin: .15rem 0 0;
    overflow-wrap: anywhere;
}

.error-shell {
    min-height: calc(100vh - 150px);
    display: grid;
    grid-template-columns: minmax(160px, 280px) minmax(0, 520px);
    align-items: center;
    justify-content: center;
    gap: clamp(1.5rem, 4vw, 3rem);
    padding: 2rem 0;
}

.error-visual {
    aspect-ratio: 1;
    border-radius: 8px;
    background: linear-gradient(145deg, #eef5f3, #fff7eb);
    border: 1px solid var(--line);
    display: grid;
    place-items: center;
}

.error-icon {
    width: 88px;
    height: 88px;
    border-radius: 50%;
    background: var(--accent);
    color: #fff;
    display: grid;
    place-items: center;
    font-size: 3rem;
    font-weight: 800;
}

.error-panel {
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 8px;
    padding: clamp(1.25rem, 4vw, 2rem);
}

.error-kicker {
    color: var(--primary-dark);
    font-weight: 700;
    margin-bottom: .5rem;
}

.error-panel h1 {
    font-size: clamp(1.6rem, 4vw, 2.35rem);
    margin-bottom: .75rem;
}

.error-panel p {
    color: var(--muted);
}

.error-actions {
    display: flex;
    flex-wrap: wrap;
    gap: .75rem;
    margin-top: 1.25rem;
}

@media (max-width: 640px) {
    main.container {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .login-panel {
        padding: 1.25rem;
    }

    .search-bar,
    .link-row,
    .report-filter {
        grid-template-columns: 1fr;
    }

    .page-actions,
    .page-actions form,
    .page-actions .btn,
    .report-filter-actions,
    .report-filter-actions .btn {
        width: 100%;
    }

    .report-filter-actions {
        display: grid;
        grid-template-columns: 1fr;
    }

    .report-chart-grid,
    .report-list-grid {
        grid-template-columns: 1fr;
    }

    .chart-box {
        height: 280px;
    }

    .report-row-card dl {
        grid-template-columns: 1fr;
    }

    .bill-card dl {
        grid-template-columns: 1fr;
    }

    .bill-actions,
    .pdf-toolbar {
        display: grid;
        grid-template-columns: 1fr;
    }

    .bill-actions .btn,
    .pdf-toolbar .btn {
        width: 100%;
    }

    .pdf-frame {
        min-height: 68vh;
        height: 68vh;
    }

    .error-shell {
        grid-template-columns: 1fr;
        align-items: start;
    }

    .error-visual {
        max-width: 180px;
        width: 55%;
        margin: 0 auto;
    }

    .error-actions .btn {
        width: 100%;
    }
}