:root {
    --color-bg: #f5f6f8;
    --color-surface: #ffffff;
    --color-border: #e0e2e7;
    --color-text: #1f2430;
    --color-muted: #6b7280;
    --color-primary: #2f6f4f;
    --color-primary-dark: #234f38;
    --color-danger: #b3261e;
    --color-warning: #9a6700;
    --radius: 8px;
    --gap: 1rem;

    --color-input-bg: #ffffff;

    --color-badge-bg: #e7ece9;
    --color-badge-warning-bg: #fbedd2;
    --color-badge-danger-bg: #f7dcda;
    --color-badge-muted-bg: #eceef1;

    --color-flash-success-bg: #e5f3ea;
    --color-flash-success-border: #bfe0cc;
    --color-flash-error-bg: #fbe6e4;
    --color-flash-error-border: #f0c2bd;

    --color-roi-track-bg: #eceef1;
    --color-calc-result-bg: #f4faf6;
    --color-calc-result-border: #bfe0cc;

    --color-cal-free-bg: #f4faf6;
    --color-cal-free-border: #cfe8da;
    --color-cal-partial-bg: #fbedd2;
    --color-cal-partial-text: #7a5a00;
    --color-cal-busy-bg: #fbdada;
    --color-cal-busy-text: #7a1f18;
    --color-cal-requested-bg: #e2e8fb;
    --color-cal-requested-text: #313e8c;
}

:root[data-theme="dark"] {
    --color-bg: #15171b;
    --color-surface: #1e2126;
    --color-border: #30343c;
    --color-text: #e7e9ee;
    --color-muted: #9aa1ac;
    --color-primary: #4f9d74;
    --color-primary-dark: #7fcda1;
    --color-danger: #e5847c;
    --color-warning: #dcb35c;

    --color-input-bg: #262a31;

    --color-badge-bg: #263029;
    --color-badge-warning-bg: #3a3120;
    --color-badge-danger-bg: #3a2422;
    --color-badge-muted-bg: #2a2e35;

    --color-flash-success-bg: #1e2f24;
    --color-flash-success-border: #2f4d3a;
    --color-flash-error-bg: #351f1e;
    --color-flash-error-border: #55302d;

    --color-roi-track-bg: #2a2e35;
    --color-calc-result-bg: #1e2f24;
    --color-calc-result-border: #2f4d3a;

    --color-cal-free-bg: #1a1d22;
    --color-cal-free-border: #2c3a30;
    --color-cal-partial-bg: #3a3120;
    --color-cal-partial-text: #e6c477;
    --color-cal-busy-bg: #3a2422;
    --color-cal-busy-text: #e5847c;
    --color-cal-requested-bg: #232a42;
    --color-cal-requested-text: #a9b6f5;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.45;
}

a {
    color: var(--color-primary-dark);
}

.app-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 10;
}

.app-header-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.app-title {
    font-weight: 700;
    font-size: 1.1rem;
    text-decoration: none;
    color: var(--color-text);
}

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.4rem 0.7rem;
    font-size: 1rem;
}

nav.main-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
    padding: 0 1rem 0.75rem;
    max-width: 1200px;
    margin: 0 auto;
}

nav.main-nav a {
    text-decoration: none;
    color: var(--color-muted);
    padding: 0.35rem 0.1rem;
    border-bottom: 2px solid transparent;
    font-size: 0.95rem;
}

nav.main-nav a.active,
nav.main-nav a:hover {
    color: var(--color-primary-dark);
    border-bottom-color: var(--color-primary);
}

.user-bar {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
    color: var(--color-muted);
}

main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 1rem 3rem;
}

h1 {
    font-size: 1.5rem;
    margin: 0 0 1rem;
}

h2 {
    font-size: 1.15rem;
    margin: 1.5rem 0 0.75rem;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
}

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

.stat {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 1rem;
}

.stat .value {
    font-size: 1.6rem;
    font-weight: 700;
}

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

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.toolbar .filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.btn {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    padding: 0.55rem 1rem;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
}

.btn:hover {
    background: var(--color-primary-dark);
}

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

.btn.danger {
    background: var(--color-danger);
}

.btn.small {
    padding: 0.3rem 0.6rem;
    font-size: 0.85rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
}

table th,
table td {
    text-align: left;
    padding: 0.6rem 0.7rem;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.92rem;
    vertical-align: top;
}

table th {
    color: var(--color-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.table-wrap {
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

.table-wrap table {
    border: none;
}

.row-actions {
    display: flex;
    gap: 0.4rem;
    flex-wrap: wrap;
}

form .field {
    margin-bottom: 1rem;
}

form label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 0.3rem;
}

form .hint {
    color: var(--color-muted);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="tel"],
select,
textarea {
    width: 100%;
    padding: 0.55rem 0.65rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    background: var(--color-input-bg);
    color: var(--color-text);
    font-family: inherit;
}

textarea {
    min-height: 5rem;
    resize: vertical;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0 1rem;
}

.badge {
    display: inline-block;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
    background: var(--color-badge-bg);
    color: var(--color-primary-dark);
}

.badge.warning {
    background: var(--color-badge-warning-bg);
    color: var(--color-warning);
}

.badge.danger {
    background: var(--color-badge-danger-bg);
    color: var(--color-danger);
}

.badge.muted {
    background: var(--color-badge-muted-bg);
    color: var(--color-muted);
}

.flash {
    border-radius: var(--radius);
    padding: 0.7rem 1rem;
    margin-bottom: 1rem;
    font-size: 0.92rem;
}

.flash.success {
    background: var(--color-flash-success-bg);
    color: var(--color-primary-dark);
    border: 1px solid var(--color-flash-success-border);
}

.flash.error {
    background: var(--color-flash-error-bg);
    color: var(--color-danger);
    border: 1px solid var(--color-flash-error-border);
}

.empty-state {
    color: var(--color-muted);
    padding: 2rem 1rem;
    text-align: center;
}

.set-item-row,
.rental-item-row {
    display: grid;
    grid-template-columns: 2fr 1fr auto;
    gap: 0.5rem;
    align-items: end;
    margin-bottom: 0.5rem;
}

.login-wrap {
    max-width: 380px;
    margin: 4rem auto;
    padding: 0 1rem;
}

.login-wrap .card {
    margin-bottom: 0;
}

.calendar-table th,
.calendar-table td {
    text-align: center;
    padding: 0.3rem;
    font-size: 0.78rem;
    white-space: nowrap;
}

.calendar-table td.free {
    background: var(--color-cal-free-bg);
}

.calendar-table td.busy {
    background: var(--color-cal-busy-bg);
    color: var(--color-cal-busy-text);
    font-weight: 600;
}

.calendar-table td.partial {
    background: var(--color-cal-partial-bg);
    color: var(--color-cal-partial-text);
    font-weight: 600;
}

.calendar-table td.requested {
    background: var(--color-cal-requested-bg);
    color: var(--color-cal-requested-text);
}

.calendar-table .req-badge {
    display: block;
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--color-cal-requested-text);
}

.calendar-legend {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    align-items: center;
}

.calendar-legend .swatch {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 3px;
    margin-right: 0.35rem;
    vertical-align: middle;
}

.calendar-legend .swatch.free {
    background: var(--color-cal-free-bg);
    border: 1px solid var(--color-cal-free-border);
}

.calendar-legend .swatch.partial {
    background: var(--color-cal-partial-bg);
}

.calendar-legend .swatch.busy {
    background: var(--color-cal-busy-bg);
}

.calendar-legend .swatch.requested {
    background: var(--color-cal-requested-bg);
}

.calendar-table th.article-name,
.calendar-table td.article-name {
    text-align: left;
    position: sticky;
    left: 0;
    background: var(--color-surface);
    white-space: normal;
    min-width: 150px;
}

.roi-bar-track {
    background: var(--color-roi-track-bg);
    border-radius: 999px;
    height: 8px;
    overflow: hidden;
    min-width: 100px;
}

.roi-bar-fill {
    background: var(--color-primary);
    height: 100%;
}

.calc-result {
    background: var(--color-calc-result-bg);
    border: 1px solid var(--color-calc-result-border);
    border-radius: var(--radius);
    padding: 1rem;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.4rem 0.6rem;
    font-size: 1rem;
    line-height: 1;
    cursor: pointer;
    color: var(--color-text);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 1rem;
}

.modal-overlay[hidden] {
    display: none;
}

.modal-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    max-width: 900px;
    width: 100%;
    max-height: 85vh;
    overflow: auto;
    padding: 1.25rem;
    position: relative;
}

.modal-close {
    position: absolute;
    top: 0.5rem;
    right: 0.75rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    line-height: 1;
    cursor: pointer;
    color: var(--color-muted);
}

.modal-body h3 {
    margin-top: 0;
}

.rental-item-availability.zero {
    color: var(--color-danger);
    font-weight: 600;
}

.rental-item-availability.low {
    color: var(--color-warning);
}

.calendar-table td a,
.calendar-table td .cal-cell-link {
    display: block;
    width: 100%;
    height: 100%;
    color: inherit;
    text-decoration: none;
    background: none;
    border: none;
    font: inherit;
    cursor: pointer;
    padding: 0;
}

.theme-toggle:hover {
    background: var(--color-bg);
}

@media (max-width: 720px) {
    nav.main-nav {
        display: none;
        flex-direction: column;
        gap: 0;
    }

    nav.main-nav.open {
        display: flex;
    }

    nav.main-nav a {
        padding: 0.6rem 0;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-toggle {
        display: inline-block;
    }

    .table-wrap table:not(.calendar-table),
    .table-wrap table:not(.calendar-table) thead,
    .table-wrap table:not(.calendar-table) tbody,
    .table-wrap table:not(.calendar-table) tr,
    .table-wrap table:not(.calendar-table) td {
        display: block;
        width: 100%;
    }

    .table-wrap table:not(.calendar-table) thead {
        display: none;
    }

    .table-wrap table:not(.calendar-table) tr {
        border-bottom: 1px solid var(--color-border);
        padding: 0.6rem 0.7rem;
    }

    .table-wrap table:not(.calendar-table) td {
        border: none;
        padding: 0.25rem 0;
        display: flex;
        justify-content: space-between;
        gap: 1rem;
    }

    .table-wrap table:not(.calendar-table) td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--color-muted);
        font-size: 0.78rem;
        text-transform: uppercase;
    }

    /* Kalender bleibt eine echte Tabelle und scrollt horizontal statt zu stapeln. */
    .calendar-table th,
    .calendar-table td {
        min-width: 28px;
    }

    .calendar-table td.article-name,
    .calendar-table th.article-name {
        min-width: 110px;
    }

    .set-item-row,
    .rental-item-row {
        grid-template-columns: 1fr;
    }
}