:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-color: #1e293b;
    --border-color: #e2e8f0;
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

main {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

label {
    font-weight: 600;
    font-size: 0.9rem;
}

input, select {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    width: 100%;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button {
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 1rem;
}

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

/* Autocomplete */
.autocomplete {
    position: relative;
}

.autocomplete-items {
    position: absolute;
    border: 1px solid var(--border-color);
    border-bottom: none;
    border-top: none;
    z-index: 99;
    top: 100%;
    left: 0;
    right: 0;
    background-color: #fff;
    border-radius: 0 0 0.5rem 0.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    max-height: 200px;
    overflow-y: auto;
}

.autocomplete-items div {
    padding: 10px;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
}

.autocomplete-items div:hover {
    background-color: #f1f5f9;
}

.autocomplete-active {
    background-color: var(--primary-color) !important;
    color: #ffffff;
}

/* Results */
.result-section {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.stats-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.card {
    background: #f1f5f9;
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-align: center;
}

.card h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: #64748b;
    margin-bottom: 0.5rem;
}

.card p {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
}

.chart-container {
    height: 400px;
    position: relative;
}

@media (max-width: 600px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}