:root {
    --primary-color: #4361ee;
    --primary-hover: #3a56d4;
    --secondary-color: #4f5d75;
    --secondary-hover: #404c5e;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --dark-color: #2d3748;
    --light-color: #f8f9fa;
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    --gray-300: #dee2e6;
    --gray-400: #ced4da;
    --gray-500: #adb5bd;
    --gray-600: #6c757d;
    --gray-700: #495057;
    --gray-800: #343a40;
    --gray-900: #212529;
}

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

body {
    font-family: 'Noto Sans KR', 'Roboto', sans-serif;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--gray-200);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

header p {
    color: var(--gray-600);
    font-size: 1.1rem;
}

/* 버튼 스타일 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
}

.btn i {
    margin-right: 0.5rem;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
}

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

.btn.secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn.secondary:hover {
    background-color: var(--secondary-hover);
}

.btn.danger {
    background-color: var(--danger-color);
    color: white;
}

.btn.danger:hover {
    background-color: #c0392b;
}

/* 요약 섹션 */
.summary-section {
    margin-bottom: 2rem;
}

.summary-section h2 {
    margin-bottom: 1rem;
    color: var(--dark-color);
    font-weight: 600;
}

.summary-card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.summary-items {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    width: 100%;
}

.summary-item {
    display: flex;
    flex-direction: column;
}

.summary-item .label {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0.25rem;
}

.summary-item .value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--gray-800);
}

.summary-item.highlight .value {
    color: var(--primary-color);
    font-size: 1.4rem;
}

.button-group {
    display: flex;
    gap: 1rem;
}

/* 컨트롤 섹션 */
.controls-section {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.add-stock-btn {
    font-size: 1.1rem;
    padding: 0.875rem 1.5rem;
}

/* 주식 카드 섹션 */
.stock-cards-section {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(400px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stock-card {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.stock-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
    border-bottom: 1px solid var(--gray-300);
    padding-bottom: 0.75rem;
}

.stock-name-input {
    font-size: 1.2rem;
    font-weight: 600;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.25rem 0;
    width: 100%;
    margin-right: 1rem;
    color: var(--dark-color);
    background-color: transparent;
}

.stock-name-input:focus {
    outline: none;
    border-bottom-color: var(--primary-color);
}

.delete-btn {
    background-color: transparent;
    color: var(--danger-color);
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

.delete-btn:hover {
    background-color: rgba(231, 76, 60, 0.1);
}

/* 입력 필드 그룹 */
.input-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.input-field {
    display: flex;
    flex-direction: column;
}

.input-field label {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 0.375rem;
}

.input-field input, 
.input-field select {
    padding: 0.75rem;
    border: 1px solid var(--gray-300);
    border-radius: 4px;
    font-size: 1rem;
    color: var(--gray-800);
    transition: all 0.2s;
}

.input-field input:focus, 
.input-field select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(67, 97, 238, 0.1);
}

/* 결과 섹션 */
.stock-card-results {
    margin-top: 1.5rem;
    border-top: 1px solid var(--gray-300);
    padding-top: 1.25rem;
}

.results-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--dark-color);
    margin-bottom: 1rem;
}

.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.result-item {
    display: flex;
    flex-direction: column;
}

.result-item .label {
    font-size: 0.85rem;
    color: var(--gray-600);
    margin-bottom: 0.125rem;
}

.result-item .value {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--gray-800);
}

.result-item.highlight .value {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* 푸터 */
footer {
    text-align: center;
    margin-top: 3rem;
    color: var(--gray-600);
    font-size: 0.9rem;
}

/* 반응형 디자인 */
@media (max-width: 1024px) {
    .summary-items {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .stock-cards-section {
        grid-template-columns: 1fr;
    }
    
    .summary-card {
        flex-direction: column;
    }
    
    .summary-items {
        margin-bottom: 1.5rem;
    }
    
    .button-group {
        width: 100%;
        justify-content: space-between;
    }
}

@media (max-width: 576px) {
    .summary-items {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .input-group {
        grid-template-columns: 1fr;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
}