/* Reset und Basis */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: #fff;
}

/* Header */
.header {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid #e0e0e0;
}

.header h1 {
    font-size: 2.5em;
    margin-bottom: 15px;
    color: #2c3e50;
}

.header h1 a {
    color: #2c3e50;
    text-decoration: none;
}

.header h1 a:hover {
    color: #3498db;
}

/* Navigation */
.navigation {
    margin: 20px 0;
    padding: 15px;
    background: #ecf0f1;
    border-radius: 8px;
}

.navigation a {
    display: inline-block;
    margin: 0 15px 10px 0;
    padding: 8px 15px;
    color: #2c3e50;
    text-decoration: none;
    background: #fff;
    border-radius: 5px;
    font-weight: 500;
}

.navigation a:hover {
    background: #3498db;
    color: #fff;
}

.navigation a:active {
    background: #d5d8dc;
}

/* Pagination */
.pagination {
    text-align: center;
    margin: 20px 0;
    font-size: 1.2em;
}

.pagination a {
    color: #3498db;
    text-decoration: none;
    padding: 8px 15px;
    margin: 0 10px;
    border-radius: 5px;
}

.pagination a:hover {
    background: #3498db;
    color: #fff;
}

.pagination .year {
    font-weight: bold;
    font-size: 1.3em;
    color: #2c3e50;
    padding: 0 15px;
}

/* Info Box */
.info-box {
    background: #e8f4f8;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    border-left: 4px solid #3498db;
}

.info-box p {
    margin: 5px 0;
}

.kw-highlight {
    background: #fff176;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: bold;
    color: #000;
}

/* Calendar Overview */
.calendar-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.month-container {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.month-container:hover {
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
}

.month-container h2 {
    font-size: 1.3em;
    margin-bottom: 15px;
    color: #2c3e50;
    text-align: center;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

.month-container h2 a {
    color: #2c3e50;
    text-decoration: none;
}

.month-container h2 a:hover {
    color: #3498db;
}

/* Month Table */
.month {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
}

.month thead th {
    background: #34495e;
    color: #fff;
    padding: 8px 4px;
    text-align: center;
    font-weight: 600;
    font-size: 0.85em;
}

.month thead th.kw {
    background: #2c3e50;
}

.month tr {
    border-bottom: 1px solid #ecf0f1;
}

.month tr.current {
    background: #fff9c4;
}

.month th.kw {
    background: #ecf0f1;
    color: #2c3e50;
    font-weight: bold;
    padding: 8px 4px;
    text-align: center;
    border-right: 2px solid #bdc3c7;
}

.month td {
    padding: 8px 4px;
    text-align: center;
}

.month td.in {
    color: #2c3e50;
    font-weight: 500;
}

.month td.in:hover {
    background: #e8f4f8;
}

.month td.out {
    color: #bdc3c7;
}

.month td.today {
    position: relative;
}

.month td.today span {
    display: inline-block;
    width: 30px;
    height: 30px;
    line-height: 30px;
    border-radius: 50%;
    background: #3498db;
    color: #fff;
    font-weight: bold;
}

.month td span {
    display: block;
}

/* Info Section */
.info-section {
    background: #ecf0f1;
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.info-section h2 {
    color: #2c3e50;
    margin-bottom: 15px;
    font-size: 1.5em;
    border-bottom: 2px solid #3498db;
    padding-bottom: 10px;
}

.info-section h3 {
    color: #34495e;
    margin: 20px 0 10px 0;
    font-size: 1.2em;
}

.info-section ul {
    list-style: none;
}

.info-section ul li {
    padding: 10px 0;
    padding-left: 25px;
    position: relative;
}

.info-section ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #3498db;
    font-weight: bold;
}

/* Footer */
.footer {
    text-align: center;
    padding: 20px;
    background: #2c3e50;
    color: #ecf0f1;
    border-radius: 8px;
    margin-top: 30px;
}

.footer p {
    margin: 5px 0;
}

.footer a {
    color: #3498db;
    text-decoration: none;
}

.footer a:hover {
    color: #fff;
    text-decoration: underline;
}

/* Zusätzliche Seiten */
.content-page {
    padding: 30px 0;
}

.content-page h1 {
    color: #2c3e50;
    margin-bottom: 20px;
    border-bottom: 3px solid #3498db;
    padding-bottom: 10px;
}

.content-page h2 {
    color: #34495e;
    margin: 25px 0 15px 0;
    font-size: 1.5em;
}

.content-page h3 {
    color: #34495e;
    margin: 20px 0 10px 0;
    font-size: 1.2em;
}

.content-page p {
    margin-bottom: 15px;
    line-height: 1.8;
}

.content-page ul {
    margin: 15px 0 15px 30px;
}

.content-page ul li {
    margin: 8px 0;
}

/* Clock Display */
.clock-display {
    text-align: center;
    padding: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 15px;
    color: #fff;
    margin: 30px 0;
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
}

.clock-time {
    font-size: 4em;
    font-weight: bold;
    letter-spacing: 3px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.clock-date {
    font-size: 1.5em;
    margin-top: 10px;
    opacity: 0.9;
}

.clock-timezone {
    font-size: 1em;
    margin-top: 10px;
    opacity: 0.8;
}

/* Leap Year Table */
.leap-year-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.leap-year-table thead {
    background: #34495e;
    color: #fff;
}

.leap-year-table th,
.leap-year-table td {
    padding: 12px;
    text-align: center;
    border: 1px solid #ddd;
}

.leap-year-table tbody tr:nth-child(even) {
    background: #f8f9fa;
}

.leap-year-table tbody tr:hover {
    background: #e8f4f8;
}

.leap-year-yes {
    color: #27ae60;
    font-weight: bold;
}

.leap-year-no {
    color: #95a5a6;
}

/* Holiday Table */
.holiday-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.holiday-table thead {
    background: #e74c3c;
    color: #fff;
}

.holiday-table th,
.holiday-table td {
    padding: 12px;
    text-align: left;
    border: 1px solid #ddd;
}

.holiday-table tbody tr:nth-child(even) {
    background: #f8f9fa;
}

.holiday-table tbody tr:hover {
    background: #fee;
}

/* Mobile Optimierungen */
@media (max-width: 768px) {
    body {
        font-size: 15px;
    }
    
    .container {
        padding: 15px;
    }
    
    .calendar-overview {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .header h1 {
        font-size: 1.8em;
        margin-bottom: 10px;
    }
    
    .navigation {
        padding: 10px;
    }
    
    .navigation a {
        display: block;
        margin: 8px 0;
        text-align: center;
        padding: 10px;
    }
    
    .month {
        font-size: 0.85em;
    }
    
    .month thead th {
        padding: 6px 2px;
        font-size: 0.8em;
    }
    
    .month td {
        padding: 6px 2px;
    }
    
    .month td.today span {
        width: 26px;
        height: 26px;
        line-height: 26px;
        font-size: 0.9em;
    }
    
    .pagination {
        font-size: 1em;
    }
    
    .pagination a {
        display: inline-block;
        margin: 5px;
        padding: 8px 12px;
    }
    
    .info-box {
        padding: 12px;
        font-size: 0.95em;
    }
    
    .info-section {
        padding: 15px;
    }
    
    .info-section h2 {
        font-size: 1.3em;
    }
    
    .content-page h1 {
        font-size: 1.6em;
    }
    
    .content-page h2 {
        font-size: 1.3em;
    }
    
    .clock-display {
        padding: 30px 15px;
    }
    
    .clock-time {
        font-size: 2.5em;
        letter-spacing: 2px;
    }
    
    .clock-date {
        font-size: 1.1em;
    }
    
    /* Tabellen auf Mobile */
    .leap-year-table,
    .holiday-table {
        font-size: 0.9em;
    }
    
    .leap-year-table th,
    .leap-year-table td,
    .holiday-table th,
    .holiday-table td {
        padding: 8px 4px;
    }
}

@media (max-width: 480px) {
    body {
        font-size: 14px;
    }
    
    .header h1 {
        font-size: 1.5em;
    }
    
    .month {
        font-size: 0.75em;
    }
    
    .month thead th {
        padding: 5px 1px;
    }
    
    .month td {
        padding: 5px 1px;
    }
    
    .month-container {
        padding: 10px;
    }
    
    .month-container h2 {
        font-size: 1.1em;
        margin-bottom: 10px;
    }
    
    .clock-time {
        font-size: 2em;
        letter-spacing: 1px;
    }
    
    .clock-date {
        font-size: 1em;
    }
    
    .info-section {
        padding: 12px;
    }
    
    /* Noch kleinere Tabellen */
    .leap-year-table,
    .holiday-table {
        font-size: 0.8em;
    }
}

/* Links allgemein */
a {
    color: #3498db;
    text-decoration: none;
}

a:hover {
    color: #2c3e50;
}

a:active {
    opacity: 0.7;
}

/* Barrierefreiheit */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}