* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
}

body {
    display: flex;
    flex-direction: column;
}

header,
nav,
main,
footer {
    padding: 12px 24px;
}

header .header-title {
    font-weight: bold;
    letter-spacing: 0.05em;
}

header .header-bar {
    overflow: hidden;
    white-space: nowrap;
    font-size: 0.85em;
    margin-top: 4px;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    border-top: 1px dashed currentColor;
    border-bottom: 1px dashed currentColor;
}

.nav-key {
    opacity: 0.7;
}

main {
    flex: 1;
}

.panel {
    max-width: 720px;
}

.panel h1 {
    font-size: 1.2em;
    margin: 0 0 12px;
    letter-spacing: 0.04em;
}

code {
    padding: 1px 6px;
    border: 1px solid currentColor;
    opacity: 0.9;
}

.form-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 12px 0;
}

.form-row label {
    width: 110px;
}

.form-row input[type="text"] {
    flex: 1;
    min-width: 0;
    padding: 6px 8px;
    font: inherit;
}

.form-actions {
    display: flex;
    gap: 12px;
    margin: 16px 0;
}

button {
    font: inherit;
    padding: 6px 14px;
    cursor: pointer;
    letter-spacing: 0.04em;
}

.result-box {
    margin-top: 20px;
    padding: 16px;
    min-height: 80px;
    border: 1px solid currentColor;
}

.result-box dl {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 4px 16px;
    margin: 8px 0 0;
}

.result-box dt {
    opacity: 0.7;
}

.result-box dd {
    margin: 0;
}

.result-box .echo h2 {
    margin: 0 0 8px;
    font-size: 1em;
    letter-spacing: 0.06em;
}

footer {
    display: flex;
    justify-content: space-between;
    border-top: 1px dashed currentColor;
    font-size: 0.85em;
    opacity: 0.8;
}

.muted { opacity: 0.7; }

.panel-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 12px;
}

.panel-head h2 {
    margin: 0;
    font-size: 1.1em;
}

table {
    border-collapse: collapse;
    width: 100%;
    font-size: 0.95em;
}

th, td {
    border: 1px solid currentColor;
    padding: 6px 10px;
    text-align: left;
    vertical-align: middle;
}

th {
    font-weight: bold;
    opacity: 0.85;
    letter-spacing: 0.05em;
}

.row-actions {
    display: flex;
    gap: 6px;
    white-space: nowrap;
}

.row-actions button {
    padding: 2px 8px;
    font-size: 0.9em;
}

.count {
    margin-top: 8px;
    opacity: 0.7;
    font-size: 0.9em;
}

.form-row-double {
    flex-wrap: nowrap;
}

.form-row .small {
    flex: 0 0 90px;
}

td.num,
th.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
}

table.line-items input {
    width: 100%;
    padding: 4px 6px;
    font: inherit;
    background: transparent;
    border: 0;
    border-bottom: 1px solid currentColor;
    color: inherit;
}

table.line-items td:first-child {
    width: 32px;
    text-align: center;
    opacity: 0.6;
}

table.totals {
    margin-top: 16px;
    width: auto;
    min-width: 320px;
    margin-left: auto;
}

table.totals th,
table.totals td {
    border: 0;
    border-top: 1px dashed currentColor;
    padding: 4px 12px;
}

table.totals tr.ttc th,
table.totals tr.ttc td {
    border-top: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    font-weight: bold;
    font-size: 1.05em;
}

dl.kv {
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 4px 16px;
    margin: 0 0 16px;
}

dl.kv dt {
    opacity: 0.7;
}

dl.kv dd {
    margin: 0;
}

.filters {
    display: flex;
    gap: 12px;
    margin: 8px 0 16px;
    align-items: center;
}

.filters input[type="search"] {
    flex: 1;
    min-width: 0;
    padding: 6px 10px;
    font: inherit;
}

.filters select {
    padding: 6px 10px;
    font: inherit;
}

.list-footer {
    margin-top: 12px;
    opacity: 0.85;
    font-size: 0.9em;
    text-align: right;
}

.badge {
    display: inline-block;
    padding: 1px 8px;
    font-size: 0.85em;
    letter-spacing: 0.06em;
    border: 1px solid currentColor;
    text-transform: uppercase;
}

.panel-head .actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.panel-head .actions a.btn-primary,
.panel-head .actions a.btn {
    display: inline-block;
    padding: 6px 14px;
    text-decoration: none;
    cursor: pointer;
    font: inherit;
    letter-spacing: 0.04em;
}

.barchart {
    list-style: none;
    margin: 12px 0 24px;
    padding: 0;
    display: grid;
    gap: 4px;
}

.barchart li {
    display: grid;
    grid-template-columns: 40px 1fr 130px;
    align-items: center;
    gap: 12px;
    font-variant-numeric: tabular-nums;
}

.bar-label {
    font-weight: 600;
    opacity: 0.7;
    font-size: 0.85em;
    letter-spacing: 0.05em;
}

.bar-track {
    position: relative;
    height: 16px;
    background: rgba(127, 127, 127, 0.15);
    border-radius: 2px;
    overflow: hidden;
}

.bar-fill {
    position: absolute;
    inset: 0 auto 0 0;
    background: currentColor;
    opacity: 0.55;
    border-radius: 2px;
}

.bar-value {
    text-align: right;
    font-size: 0.9em;
    opacity: 0.85;
}

.panel h3 {
    font-size: 1em;
    margin: 20px 0 8px;
    letter-spacing: 0.04em;
    opacity: 0.9;
}

.vat-tracker {
    margin: 8px 0 24px;
}

.vat-bar {
    position: relative;
    height: 14px;
    background: rgba(127, 127, 127, 0.18);
    border-radius: 4px;
    overflow: hidden;
}

.vat-fill {
    height: 100%;
    background: currentColor;
    opacity: 0.55;
    transition: width 0.4s ease-out;
}

.vat-summary {
    margin: 8px 0 4px;
    font-size: 0.95em;
    font-variant-numeric: tabular-nums;
}

.vat-cta {
    margin: 4px 0 0;
    font-size: 0.9em;
    opacity: 0.85;
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
    header,
    nav,
    main,
    footer {
        padding: 10px 14px;
    }

    header .header-bar { display: none; }

    nav { gap: 8px; }

    .nav-key {
        flex: 1 1 auto;
        min-width: 130px;
        text-align: center;
    }

    .panel {
        padding: 0;
        max-width: 100%;
    }

    .panel-head {
        flex-wrap: wrap;
    }

    .panel-head .actions {
        flex-wrap: wrap;
    }

    /* Tables become horizontally scrollable. */
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    .form-row {
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
    }

    .form-row label {
        width: auto;
    }

    .form-row-double { flex-direction: column; }
    .form-row .small { flex: 1 1 auto; }

    .filters {
        flex-direction: column;
        align-items: stretch;
    }

    .barchart li {
        grid-template-columns: 36px 1fr 100px;
        gap: 8px;
        font-size: 0.9em;
    }

    .row-actions {
        flex-direction: column;
        gap: 4px;
    }

    /* Touch targets >= 40px on phones. */
    button, a.btn-primary, a.btn,
    input[type="submit"] {
        min-height: 38px;
    }

    table.totals { width: 100%; min-width: 0; }
}

@media (max-width: 480px) {
    h1 { font-size: 1.1em; }
    h2 { font-size: 1em; }
    h3 { font-size: 0.95em; }

    .panel h1, .panel h2 { letter-spacing: 0; }

    .barchart .bar-value { font-size: 0.8em; }

    /* Drop the 'days late' column on tiny screens. */
    .row-actions button { font-size: 0.85em; }
}