:root {
    --bg-color: #f5f5f5;
    --card-bg: #ffffff;
    --text-color: #333;
    --text-secondary: #666;
    --border-color: #e0e0e0;
    --header-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --hover-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --text-secondary: #b0b0b0;
    --border-color: #404040;
    --header-gradient: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    --shadow: 0 2px 10px rgba(0,0,0,0.3);
    --hover-shadow: 0 4px 12px rgba(0,0,0,0.5);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s, color 0.3s;
}

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

header {
    background: var(--header-gradient);
    color: white;
    padding: 30px;
    border-radius: 10px;
    margin-bottom: 30px;
    box-shadow: var(--shadow);
    position: relative;
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 5px;
}

header p {
    opacity: 0.9;
    font-size: 1.1em;
}

.theme-toggle {
    position: absolute;
    top: 30px;
    right: 30px;
    background: rgba(255, 255, 255, 0.2);
    border: 2px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
}

nav {
    margin-bottom: 30px;
}

nav a {
    display: inline-block;
    padding: 10px 20px;
    margin-right: 10px;
    background: var(--card-bg);
    color: #667eea;
    text-decoration: none;
    border-radius: 5px;
    transition: all 0.3s;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

nav a:hover,
nav a.active {
    background: #667eea;
    color: white;
}

main {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s;
}

.reports-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.report-card {
    background: var(--bg-color);
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid #667eea;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid var(--border-color);
}

.report-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--hover-shadow);
}

.report-card h3 {
    margin-bottom: 10px;
}

.report-card h3 a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
}

.report-card h3 a:hover {
    color: #667eea;
}

.report-date {
    color: var(--text-secondary);
    font-size: 0.9em;
    margin-bottom: 10px;
    display: block;
}

.report-actions {
    margin-top: 15px;
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.btn-download {
    padding: 6px 12px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.85em;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: all 0.3s;
}

.btn-download:hover {
    background: #5568d3;
    transform: translateY(-1px);
    box-shadow: 0 2px 6px rgba(102, 126, 234, 0.3);
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85em;
    font-weight: 600;
}

.status-neu {
    background: #ffeaa7;
    color: #d63031;
}

[data-theme="dark"] .status-neu {
    background: #ffd700;
    color: #8b4513;
}

.status-in_arbeit {
    background: #74b9ff;
    color: white;
}

.status-erledigt {
    background: #00b894;
    color: white;
}

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

.empty-state a {
    color: #667eea;
    text-decoration: none;
}

.report-form {
    max-width: 800px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
}

.form-group input[type="text"],
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: 5px;
    font-size: 1em;
    font-family: inherit;
    transition: border-color 0.3s, background-color 0.3s, color 0.3s;
    background-color: var(--card-bg);
    color: var(--text-color);
}

.form-group input[type="text"]:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: #667eea;
}

.form-group textarea {
    resize: vertical;
    min-height: 300px;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    font-size: 1em;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all 0.3s;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover {
    background: #5568d3;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(102, 126, 234, 0.3);
}

.btn-secondary {
    background: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background: #5a6268;
}