:root {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --accent: #38bdf8;
    --green: #4ade80;
    --red: #f87171;
    --border: #334155;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    padding: 24px;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 24px;
}

h1 {
    font-size: 24px;
    margin: 0;
}

.btn {
    display: inline-block;
    background: var(--accent);
    color: #0f172a;
    padding: 10px 18px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    border: none;
    cursor: pointer;
    font-size: 14px;
}

.btn.secondary {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.btn.danger {
    background: var(--red);
    color: #1e0a0a;
}

.summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.summary-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 16px;
}

.summary-card .label {
    color: var(--muted);
    font-size: 13px;
    margin-bottom: 6px;
}

.summary-card .value {
    font-size: 22px;
    font-weight: 700;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card);
    border-radius: 10px;
    overflow: hidden;
}

th, td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

th {
    color: var(--muted);
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

tr:last-child td { border-bottom: none; }

.positive { color: var(--green); }
.negative { color: var(--red); }

.actions { display: flex; gap: 8px; }

.actions a, .actions button {
    font-size: 13px;
    padding: 6px 10px;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--muted);
}

form.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 24px;
    max-width: 560px;
}

.field {
    margin-bottom: 16px;
}

label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--muted);
}

input, select, textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid var(--border);
    background: #0f172a;
    color: var(--text);
    font-size: 14px;
}

textarea { min-height: 80px; resize: vertical; }

.form-actions {
    display: flex;
    gap: 10px;
    margin-top: 8px;
}

.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert.success {
    background: rgba(74, 222, 128, 0.15);
    border: 1px solid var(--green);
    color: var(--green);
}

.alert.error {
    background: rgba(248, 113, 113, 0.15);
    border: 1px solid var(--red);
    color: var(--red);
}

.back-link {
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
}

.back-link:hover { color: var(--text); }

.chart-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 20px;
}

.chart-card h2 {
    font-size: 16px;
    margin: 0 0 4px 0;
}

.chart-note {
    color: var(--muted);
    font-size: 13px;
    margin: 0 0 16px 0;
}

.chart-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.chart-canvas-wrap {
    position: relative;
    width: 100%;
    height: 320px;
}

header .actions {
    flex-wrap: wrap;
}

.sortable-col {
    cursor: pointer;
    user-select: none;
    position: relative;
    padding-right: 20px !important;
}

.sortable-col:hover {
    color: var(--text);
}

.sortable-col::after {
    content: '↕';
    position: absolute;
    right: 6px;
    opacity: 0.35;
    font-size: 11px;
}

.sortable-col.sort-asc::after {
    content: '↑';
    opacity: 1;
    color: var(--accent);
}

.sortable-col.sort-desc::after {
    content: '↓';
    opacity: 1;
    color: var(--accent);
}

.row-menu {
    display: none;
    position: fixed;
    min-width: 180px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    padding: 6px;
    z-index: 1000;
}

.row-menu a,
.row-menu button {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px 10px;
    background: none;
    border: none;
    color: var(--text);
    font-size: 14px;
    cursor: pointer;
    border-radius: 6px;
    text-decoration: none;
    font-family: inherit;
}

.row-menu a:hover,
.row-menu button:hover {
    background: var(--bg);
}

.row-menu .row-menu-danger {
    color: var(--red);
}

code {
    background: #0f172a;
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 1px 6px;
    font-size: 13px;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ------------------------------------------------------------------
   Mobile responsiveness
   ------------------------------------------------------------------ */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .container {
        padding: 0;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }

    header h1 {
        font-size: 20px;
    }

    header .actions {
        width: 100%;
        gap: 6px;
    }

    header .actions .btn,
    header .actions .btn.secondary {
        font-size: 12px;
        padding: 7px 10px;
    }

    /* "Poor man's" responsive table: scrolls horizontally instead of
       squeezing columns unreadably narrow. */
    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }

    th, td {
        font-size: 13px;
        padding: 8px 10px;
    }

    .summary {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .summary-card {
        padding: 12px;
    }

    .summary-card .value {
        font-size: 18px;
    }

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

    form.card {
        max-width: 100% !important;
        padding: 16px;
    }

    /* Prevent iOS Safari from auto-zooming when an input is focused. */
    input, select, textarea {
        font-size: 16px;
    }

    .actions {
        flex-wrap: wrap;
    }
}

@media (max-width: 420px) {
    .summary {
        grid-template-columns: 1fr;
    }
}