:root {
    --primary: #2563eb;
    --primary-dark: #1e40af;
    --background: #f8fafc;
    --surface: #fff;
    --border: #e5e7eb;
    --text: #1e293b;
    --shadow: 0 2px 8px rgba(30,41,59,0.07);
}
body {
    background: var(--background);
    color: var(--text);
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
}
.container {
    max-width: 480px;
    margin: 3em auto;
    background: var(--surface);
    border-radius: 16px;
    box-shadow: var(--shadow);
    padding: 2.5em 2em 2em 2em;
    border: 1px solid var(--border);
}
h1 {
    text-align: center;
    margin-bottom: 2em;
    font-size: 2.1em;
    letter-spacing: 0.01em;
}
form {
    margin-bottom: 2.2em;
    padding-bottom: 1.2em;
    border-bottom: 1px solid var(--border);
}
form:last-of-type {
    border-bottom: none;
    margin-bottom: 0;
}
h2 {
    font-size: 1.15em;
    margin-bottom: 0.7em;
    color: var(--primary-dark);
}
label {
    display: block;
    margin-bottom: 0.7em;
    font-weight: 500;
}
.date-row {
    display: flex;
    align-items: center;
    gap: 0.5em;
    margin-top: 0.2em;
}
.date-calc-row {
    display: flex;
    align-items: center;
    gap: 0.5em;
    margin-top: 0.2em;
}
input[type="date"] {
    padding: 0.45em 0.7em;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1em;
    background: #f1f5f9;
    color: var(--text);
}
.today-btn {
    padding: 0.35em 0.9em;
    background: var(--primary-dark);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 0.95em;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}
.today-btn:hover {
    background: var(--primary);
}
button, .accordion-header {
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 1px 3px rgba(30,41,59,0.05);
    transition: background 0.2s;
}

/* Berechnungs-Buttons vergrößern */
button[type="submit"] {
    font-size: 1.1em;
    padding: 0.8em 1.5em;
    min-width: 140px;
    margin-top: 1.2em;
}

button:hover, .accordion-header:hover {
    background: var(--primary-dark);
}
button:focus, .accordion-header:focus {
    outline: 3px solid #facc15;
    outline-offset: 2px;
    box-shadow: 0 0 0 4px #1e293b;
    z-index: 2;
}
.result {
    margin-top: 1em;
    font-weight: bold;
    background: #e0e7ff;
    color: #1e293b;
    border-radius: 6px;
    padding: 0.7em 1em;
    box-shadow: 0 1px 2px rgba(30,41,59,0.04);
    border: 2px solid #2563eb;
}
.accordion {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    background: var(--surface);
    margin-bottom: 2em;
}
.accordion-item + .accordion-item {
    border-top: 1px solid var(--border);
}
.accordion-header {
    background: var(--primary-dark);
    color: #fff;
    cursor: pointer;
    padding: 1em 1.2em;
    font-size: 1.1em;
    font-weight: 600;
    border: none;
    outline: none;
    width: 100%;
    text-align: left;
    transition: background 0.2s;
}
.accordion-header.active, .accordion-header:hover {
    background: var(--primary);
}
.accordion-content {
    display: none;
    padding: 1.2em 1.2em 1em 1.2em;
    background: var(--surface);
}
.accordion-content.active {
    display: block;
}
.header-tage {
    background: #2563eb;
    color: #fff;
}
.header-tage.active, .header-tage:hover {
    background: #1e40af;
    color: #fff;
}
.header-werktage {
    background: #059669;
    color: #fff;
}
.header-werktage.active, .header-werktage:hover {
    background: #047857;
    color: #fff;
}
.header-wochentag {
    background: #f59e42;
    color: #1e293b;
}
.header-wochentag.active, .header-wochentag:hover {
    background: #d97706;
    color: #fff;
}
.header-plusminus-tage {
    background: #a21caf;
    color: #fff;
}
.header-plusminus-tage.active, .header-plusminus-tage:hover {
    background: #701a75;
    color: #fff;
}
.header-plusminus-werktage {
    background: #0ea5e9;
    color: #fff;
}
.header-plusminus-werktage.active, .header-plusminus-werktage:hover {
    background: #0369a1;
    color: #fff;
}
.header-plusminus-wochenmonate {
    background: #f43f5e;
    color: #fff;
}
.header-plusminus-wochenmonate.active, .header-plusminus-wochenmonate:hover {
    background: #be123c;
    color: #fff;
}
.header-kw {
    background: #a78bfa;
    color: #1e293b;
}
.header-kw.active, .header-kw:hover {
    background: #7c3aed;
    color: #fff;
}
.header-kw-datum {
    background: #facc15;
    color: #1e293b;
}
.header-kw-datum.active, .header-kw-datum:hover {
    background: #ca8a04;
    color: #fff;
}
.header-plusminus {
    background: #be123c;
    color: #fff;
}
.header-plusminus.active, .header-plusminus:hover {
    background: #7f1d1d;
    color: #fff;
}
@media (max-width: 600px) {
    .container {
        margin: 1em;
        padding: 1.2em 0.7em 1em 0.7em;
    }
    h1 {
        font-size: 1.3em;
    }
}