:root {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --text-muted: #a0a0a0;
    --primary: #4A90E2;
    --primary-hover: #357ABD;
    --secondary: #666;
    --accent-red: #FF6B6B;
    --accent-green: #51CF66;
    --border-radius: 8px;
    --font-family: 'Inter', sans-serif;
}

body.light-mode {
    --bg-color: #f4f6f8;
    --card-bg: #ffffff;
    --text-color: #2c3e50;
    --text-muted: #666;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Modal */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85); z-index: 1000;
    display: flex; justify-content: center; align-items: center;
}

.modal-content {
    background: var(--card-bg); padding: 2rem; border-radius: var(--border-radius);
    max-width: 600px; width: 90%;
    border: 1px solid var(--secondary);
}

.german-text { font-style: italic; margin-bottom: 1rem; }
.english-text { margin-bottom: 1.5rem; color: var(--text-muted); }

/* Layout */
.app-container {
    max-width: 800px; margin: 0 auto; padding: 1rem;
    min-height: 100vh; display: flex; flex-direction: column;
}

header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 0; margin-bottom: 2rem;
}

.logo { font-size: 1.5rem; font-weight: bold; color: var(--primary); }

/* Progress Bar */
.progress-bar {
    display: flex; justify-content: space-between; margin-bottom: 2rem;
    border-bottom: 1px solid var(--secondary); padding-bottom: 0.5rem;
}
.step { color: var(--text-muted); font-size: 0.9rem; }
.step.active { color: var(--primary); font-weight: bold; }

/* Forms */
.form-group { margin-bottom: 1.5rem; }
label { display: block; margin-bottom: 0.5rem; font-weight: 600; }

input[type="number"], select {
    width: 100%; padding: 10px;
    background: var(--bg-color); border: 1px solid var(--secondary);
    color: var(--text-color); border-radius: var(--border-radius);
    font-size: 1rem;
}

.input-suffix { display: flex; align-items: center; gap: 10px; }

/* Radio Cards */
.radio-group { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.radio-card {
    background: var(--card-bg); padding: 1rem;
    border: 2px solid transparent; border-radius: var(--border-radius);
    cursor: pointer; transition: 0.2s;
}
.radio-card:hover { border-color: var(--secondary); }
.radio-card input { display: none; }
.radio-card input:checked + .card-content { color: var(--primary); }
.radio-card input:checked ~ .card-content { font-weight: bold; }
.radio-card:has(input:checked) { border-color: var(--primary); background: rgba(74, 144, 226, 0.1); }

/* Warnings */
.warning-box {
    margin-top: 0.5rem; padding: 0.8rem;
    background: rgba(255, 107, 107, 0.1); border-left: 4px solid var(--accent-red);
    color: var(--accent-red); font-size: 0.9rem;
}
.success-text { color: var(--accent-green); margin-top: 0.5rem; }

/* Results */
.results-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 2rem; }
.result-card {
    background: var(--card-bg); padding: 1.5rem;
    border-radius: var(--border-radius); box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    text-align: center;
}
.result-card.highlight { border: 1px solid var(--primary); }
.big-number { font-size: 2rem; font-weight: bold; color: var(--primary); margin: 0.5rem 0; }

.comp-table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
.comp-table th, .comp-table td { 
    padding: 10px; border-bottom: 1px solid var(--secondary); text-align: left; 
}

/* Hacks */
.hacks-container { background: rgba(81, 207, 102, 0.05); padding: 1.5rem; border-radius: var(--border-radius); margin-bottom: 2rem; border: 1px solid var(--accent-green); }
.hack-item { margin-bottom: 1.5rem; border-bottom: 1px dashed var(--secondary); padding-bottom: 1rem; }

/* Buttons */
.btn-primary {
    background: var(--primary); color: white; border: none;
    padding: 12px 24px; border-radius: var(--border-radius);
    cursor: pointer; font-size: 1rem; font-weight: 600;
}
.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary {
    background: transparent; color: var(--text-muted); border: 1px solid var(--secondary);
    padding: 12px 24px; border-radius: var(--border-radius); cursor: pointer;
}
.btn-row { display: flex; gap: 1rem; margin-top: 2rem; }
.full-width { width: 100%; }
.cta-banner {
    background: linear-gradient(45deg, #2d2d2d, #444);
    padding: 1.5rem; border-radius: var(--border-radius);
    text-align: center; margin-bottom: 2rem;
}

.hidden { display: none !important; }

/* Responsive */
@media (max-width: 600px) {
    .radio-group { grid-template-columns: 1fr; }
    .results-grid { grid-template-columns: 1fr; }
}