:root {
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-main: #2d3748;
    --text-muted: #718096;
    --primary: #2b6cb0;
    --primary-hover: #2c5282;
    --border-color: #e2e8f0;
    --accent: #e53e3e;
    --eligible-bg: #f0fff4;
    --eligible-text: #22543d;
    --eligible-border: #c6f6d5;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    box-sizing: border-box;
    margin: 0;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #1a202c;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--text-muted);
    margin: 0;
}

.card {
    background: var(--card-bg);
    padding: 24px;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group.birth-group {
    max-width: 250px;
    margin: 0 auto;
}

label {
    font-weight: 600;
    font-size: 0.95rem;
}

input[type="number"] {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

input[type="number"]:focus {
    border-color: var(--primary);
}

.toggle-container {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 20px 0;
    font-weight: 600;
    cursor: pointer;
    user-select: none;
}

.toggle-container input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.conflict-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: transform 0.15s, box-shadow 0.15s;
}

.conflict-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.conflict-info h3 {
    margin: 0 0 6px 0;
    font-size: 1.15rem;
    color: #1a202c;
}

.conflict-years {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
}

.age-display {
    text-align: right;
}

.age-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
}

.age-status {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    margin-top: 4px;
    letter-spacing: 0.5px;
}

.prime-age {
    background-color: var(--eligible-bg);
    border-color: var(--eligible-border);
}

.prime-age .age-value, 
.prime-age .age-status {
    color: var(--eligible-text);
}

@media (max-width: 600px) {
    .conflict-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    .age-display {
        text-align: left;
        width: 100%;
        border-top: 1px solid var(--border-color);
        padding-top: 12px;
    }
}