:root {
    --bg-color: #f5f5f5;
    --container-bg: white;
    --text-color: #333;
    --heading-color: #2c3e50;
    --border-color: #ddd;
    --input-bg: white;
    --input-border: #ddd;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --result-bg: #f8f9fa;
    --top-candidate-bg: #d4edda;
    --second-candidate-bg: #d1ecf1;
    --third-candidate-bg: #fff3cd;
    --stats-bg: #e8f4f8;
    --info-bg: #f0f8ff;
    --info-border: #d1ecf1;
    --link-color: #007bff;
    --shadow: rgba(0,0,0,0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #e0e0e0;
    --heading-color: #4a9eff;
    --border-color: #444;
    --input-bg: #3a3a3a;
    --input-border: #555;
    --button-bg: #4a9eff;
    --button-hover: #357abd;
    --result-bg: #3a3a3a;
    --top-candidate-bg: #1a4d2e;
    --second-candidate-bg: #1a3d4d;
    --third-candidate-bg: #4d3d1a;
    --stats-bg: #2a3a4a;
    --info-bg: #2a3a4a;
    --info-border: #3a4a5a;
    --link-color: #6cb3ff;
    --shadow: rgba(0,0,0,0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 20px;
    background-color: var(--bg-color);
    color: var(--text-color);
    max-width: 1000px;
    margin: 0 auto;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    background: var(--container-bg);
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow);
    transition: background-color 0.3s ease;
}

.header-section {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

h1 {
    color: var(--heading-color);
    text-align: center;
    margin: 0;
    flex: 1;
}

.theme-toggle {
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-left: 20px;
}

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

.theme-icon {
    font-size: 1.2rem;
}

.input-section {
    margin-bottom: 30px;
}

textarea {
    width: 100%;
    font-size: 1rem;
    margin-bottom: 15px;
    padding: 10px;
    border: 2px solid var(--input-border);
    border-radius: 5px;
    resize: vertical;
    font-family: 'Courier New', monospace;
    box-sizing: border-box;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: all 0.3s ease;
}

button {
    font-size: 1rem;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    background-color: var(--button-bg);
    color: white;
    margin-right: 10px;
    margin-bottom: 10px;
    transition: background-color 0.3s ease;
}

button:hover {
    background-color: var(--button-hover);
}

button:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

.result-block {
    margin-bottom: 15px;
    padding: 15px;
    background: var(--result-bg);
    border-left: 4px solid var(--border-color);
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    transition: background-color 0.3s ease;
}

.top-candidate {
    background: var(--top-candidate-bg);
    border-left-color: #28a745;
}

.second-candidate {
    background: var(--second-candidate-bg);
    border-left-color: #17a2b8;
}

.third-candidate {
    background: var(--third-candidate-bg);
    border-left-color: #ffc107;
}

.key-info {
    color: #666;
    font-weight: bold;
    margin-bottom: 8px;
}

.match-word {
    color: red;
    font-weight: bold;
}

.word-count {
    font-size: 0.9em;
    color: #666;
    margin-top: 8px;
}

.ranking-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.8em;
    font-weight: bold;
    margin-left: 8px;
}

.rank-1 {
    background: #28a745;
    color: white;
}

.rank-2 {
    background: #17a2b8;
    color: white;
}

.rank-3 {
    background: #ffc107;
    color: black;
}

.stats {
    background: var(--stats-bg);
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    transition: background-color 0.3s ease;
}