* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --bg-color: #f0f4f8;
    --card-bg: #ffffff;
    --card-header: #e8f4ea;
    --text-color: #2d3748;
    --text-muted: #718096;
    --accent: #38a169;
    --positive: #38a169;
    --negative: #e53e3e;
    --shadow: rgba(0, 0, 0, 0.08);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
}

header {
    background: #38a169;
    color: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 500;
}

header .timestamp {
    font-size: 0.85rem;
    opacity: 0.9;
}

.tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0;
    background: var(--card-bg);
    padding: 0 1rem;
    border-bottom: 2px solid var(--bg-color);
    box-shadow: 0 2px 4px var(--shadow);
}

.tab {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 0.75rem 1rem;
    cursor: pointer;
    font-size: 1rem;
    transition: color 0.2s, border-color 0.2s;
    border-bottom: 3px solid transparent;
}

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

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab.tab-right {
    margin-left: auto;
}

/* Sub-Tabs */
.sub-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.sub-tab {
    background: var(--card-bg);
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    min-height: 3.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.sub-tab:hover {
    border-color: var(--accent);
    color: var(--text-color);
}

.sub-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.sub-content {
    display: none;
}

.sub-content.active {
    display: block;
}

main {
    padding: 2rem;
    max-width: max(80vw, 1000px);
    margin: 0 auto;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

h2 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    color: var(--text-muted);
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 4px 12px var(--shadow);
    border: 1px solid #e2e8f0;
}

.card-header {
    background: var(--card-header);
    padding: 1rem 1.25rem;
    font-weight: 500;
    font-size: 1rem;
}

.card-body {
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.value-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.value {
    font-size: 1.5rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.value.secondary {
    font-size: 1.5rem;
    color: var(--text-muted);
}

.diff {
    font-size: 0.9rem;
    font-weight: 500;
    margin-top: 0.25rem;
}

.diff.positive {
    color: var(--positive);
}

.diff.positive::before {
    content: "▲ +";
}

.diff.negative {
    color: var(--negative);
}

.diff.negative::before {
    content: "▼ ";
}

.diff.neutral {
    color: var(--text-muted);
}

.diff.neutral::before {
    content: "● ";
}

.value.positive-value {
    color: var(--positive);
}

.value.negative-value {
    color: var(--negative);
}

/* PV/WP Controls */
.pv-controls,
.wp-controls,
.auto-controls,
.geraete-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.period-selector {
    display: flex;
    gap: 0.5rem;
}

.period-btn,
.wp-period-btn,
.auto-period-btn,
.geraete-period-btn {
    background: var(--card-bg);
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
    min-height: 3.25rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.period-btn:hover,
.wp-period-btn:hover,
.auto-period-btn:hover,
.geraete-period-btn:hover {
    border-color: var(--accent);
    color: var(--text-color);
}

.period-btn.active,
.wp-period-btn.active,
.auto-period-btn.active,
.geraete-period-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.date-selector {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: var(--card-bg);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    border: 2px solid #e2e8f0;
}

.date-nav {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    transition: background 0.2s;
}

.date-nav:hover {
    background: var(--bg-color);
}

#pv-current-date {
    font-weight: 500;
    min-width: 150px;
    text-align: center;
}

.date-today {
    background: var(--accent);
    border: none;
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    margin-left: 0.5rem;
    transition: opacity 0.2s;
}

.date-today:hover {
    opacity: 0.9;
}

.date-today.hidden {
    display: none;
}

/* Chart Container */
.chart-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-top: 1.5rem;
    box-shadow: 0 4px 12px var(--shadow);
    border: 1px solid #e2e8f0;
}

.chart-container canvas {
    max-height: 300px;
}

/* Geräte-Reiter: Zeile mit Kachel links und Chart rechts */
.geraet-row {
    display: grid;
    grid-template-columns: minmax(220px, 320px) 1fr;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
    align-items: stretch;
}

.geraet-row .chart-container {
    margin-top: 0;
}

.geraet-row .geraet-summary {
    margin: 0;
}

@media (max-width: 768px) {
    .geraet-row {
        grid-template-columns: 1fr;
    }
}

/* Admin / Tarifverwaltung */
.tarif-section {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 12px var(--shadow);
    border: 1px solid #e2e8f0;
}

.tarif-section h3 {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.tarif-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-row {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 150px;
    flex: 1;
}

.form-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.form-group input,
.form-group select {
    padding: 0.5rem;
    border: 2px solid #e2e8f0;
    border-radius: 6px;
    font-size: 1rem;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

.form-actions {
    justify-content: flex-end;
    align-items: flex-end;
}

.btn {
    padding: 0.5rem 1rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: opacity 0.2s;
}

.btn:hover {
    opacity: 0.9;
}

.btn-primary {
    background: var(--accent);
    color: white;
}

.btn-secondary {
    background: #718096;
    color: white;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

.btn-danger {
    background: var(--negative);
    color: white;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
}

.tarif-eintrag-actions {
    display: flex;
    gap: 0.5rem;
}

.tarif-liste {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.tarif-eintrag {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-color);
    border-radius: 6px;
}

.tarif-eintrag-info {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.tarif-eintrag-info span {
    font-size: 0.9rem;
    min-width: 6rem;
    text-align: right;
}

.tarif-eintrag-info .tarif-zeitraum {
    color: var(--text-muted);
    min-width: 6rem;
}

.tarif-eintrag-info .tarif-preis {
    font-weight: 500;
}

.tarif-eintrag-info .quelle-badge {
    text-align: center;
}

.tarif-leer {
    color: var(--text-muted);
    font-style: italic;
    padding: 0.5rem;
}

/* Übersicht */
.uebersicht-controls {
    margin-bottom: 1.5rem;
}

.uebersicht-year-btn {
    background: var(--card-bg);
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.uebersicht-year-btn:hover {
    border-color: var(--accent);
    color: var(--text-color);
}

.uebersicht-year-btn.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.uebersicht-section-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin: 2rem 0 1rem 0;
    color: var(--text-color);
}

.uebersicht-section-title:first-of-type {
    margin-top: 0;
}

.uebersicht-summary {
    margin-bottom: 1rem;
}

.uebersicht-table-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 1rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px var(--shadow);
    border: 1px solid #e2e8f0;
    overflow-x: auto;
}

.uebersicht-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
    min-width: 800px;
}

.uebersicht-table th,
.uebersicht-table td {
    padding: 0.5rem 0.4rem;
    text-align: right;
    white-space: nowrap;
}

.uebersicht-table th {
    color: var(--text-muted);
    font-weight: 500;
    border-bottom: 2px solid #e2e8f0;
}

.uebersicht-table td {
    border-bottom: 1px solid #e2e8f0;
}

.uebersicht-table .row-label {
    text-align: left;
    font-weight: 500;
    color: var(--text-color);
    padding-right: 1rem;
}

.uebersicht-table .sum-cell {
    font-weight: 600;
    border-left: 2px solid #e2e8f0;
}

.uebersicht-table .total-row td {
    font-weight: 600;
    border-top: 2px solid #e2e8f0;
    border-bottom: none;
}

.uebersicht-table td.neutral {
    color: var(--text-muted);
}

.uebersicht-table td.scale-cell {
    font-weight: 500;
}

.uebersicht-table .section-header td {
    background: var(--accent);
    color: white;
    font-weight: 600;
    text-align: left;
    padding: 0.6rem 0.8rem;
    border-bottom: none;
}

.uebersicht-table .avg-cell {
    font-weight: 500;
    color: var(--text-muted);
}

/* Quelle Badge für E-Auto */
.quelle-badge {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.quelle-netz {
    background: #fed7d7;
    color: #c53030;
}

.quelle-pv {
    background: #c6f6d5;
    color: #276749;
}