:root {
    --bg-color: #f5f5f5;
    --panel-bg: #ffffff;
    --accent: #525252;
    --accent-soft: rgba(82, 82, 82, 0.08);
    --text-primary: #171717;
    --text-secondary: #737373;
    --border-color: #d4d4d4;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
    --radius-lg: 12px;
    --radius-md: 8px;
    --hover-bg: #e5e5e5;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: "Inter", "Noto Sans KR", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
}

body {
    line-height: 1.6;
}

.container {
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.app-header {
    padding: 3.5rem 0 2.5rem;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.02), transparent);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.app-header h1 {
    margin: 0;
    font-size: clamp(1.75rem, 2.4vw, 2.6rem);
    font-weight: 700;
}

.subtitle {
    margin-top: 0.75rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

.panel {
    background-color: var(--panel-bg);
    border-radius: var(--radius-lg);
    padding: 2rem;
    margin-bottom: 1.75rem;
    box-shadow: var(--shadow);
}

.panel--compact {
    padding: 1.5rem 2rem;
}

.panel--chart {
    padding: 1.5rem 2rem 2rem;
}

.chart-header-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
}

.button--secondary {
    background-color: var(--hover-bg);
    color: var(--text-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    white-space: nowrap;
}

.button--secondary:hover:not(:disabled) {
    background-color: #d4d4d4;
}

.button--secondary:disabled {
    background-color: #f5f5f5;
    color: #a3a3a3;
}

.axis-settings-panel {
    background-color: #fafafa;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.axis-settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.axis-settings-group h4 {
    margin: 0 0 1rem;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

.axis-input-row {
    display: flex;
    gap: 1rem;
}

.axis-input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.axis-input-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.axis-input-group input {
    padding: 0.6rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    background-color: #fff;
}

.axis-input-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.axis-settings-actions {
    display: flex;
    gap: 0.75rem;
    align-items: center;
}

.panel-header {
    margin-bottom: 1.25rem;
}

.panel-header h2 {
    margin: 0 0 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.panel-description {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.file-input-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background-color: var(--accent);
    color: #fff;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
    gap: 0.5rem;
}

.file-input-label:hover,
.file-input-label:focus {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.file-input-label:active {
    transform: translateY(0);
}

.file-input-label input[type="file"] {
    display: none;
}

.help-text {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.file-list {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    background-color: var(--accent-soft);
    border: 1px solid var(--border-color);
    font-size: 0.85rem;
    gap: 1rem;
}

.file-item-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.file-item-name {
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.file-item-color {
    width: 24px;
    height: 24px;
    border-radius: 4px;
    border: 2px solid #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.file-item-color:hover {
    transform: scale(1.1);
}

.file-item-color input[type="color"] {
    opacity: 0;
    position: absolute;
    width: 0;
    height: 0;
    pointer-events: none;
}

.file-item-meta {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.param-colors {
    display: grid;
    grid-template-columns: repeat(4, minmax(80px, 1fr));
    gap: 0.5rem 0.75rem;
    margin-top: 0.5rem;
}
.param-color-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}
.param-color-item .file-item-color {
    width: 20px;
    height: 20px;
    border-radius: 4px;
}

.file-item-actions {
    display: flex;
    gap: 0.5rem;
}

.file-item-toggle {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.35rem 0.65rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: #fff;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.file-item-toggle input[type="checkbox"] {
    width: 14px;
    height: 14px;
    margin: 0;
}

.file-item-remove {
    padding: 0.35rem 0.65rem;
    border: none;
    border-radius: 6px;
    background-color: #fee;
    color: #dc2626;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.file-item-remove:hover {
    background-color: #fca;
}

.control-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.25rem;
    opacity: 0.45;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.control-grid.enabled {
    opacity: 1;
    pointer-events: auto;
}

.control-item label,
.control-item .control-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.control-item select,
.marker-form-group select {
    width: 100%;
    padding: 0.65rem 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-size: 0.95rem;
    background-color: #fff;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.control-item select:focus,
.marker-form-group select:focus,
.marker-form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(82, 82, 82, 0.15);
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.control-item--checkboxes .control-label {
    margin-bottom: 0.75rem;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem 1.25rem;
}

.checkbox-group label {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.96rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.radio-group input[type="radio"] {
    accent-color: var(--accent);
}

.control-item--info {
    grid-column: 1 / -1;
    background-color: rgba(0, 0, 0, 0.02);
    border: 1px dashed rgba(0, 0, 0, 0.1);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
}

.info-text {
    margin: 0;
    font-size: 0.92rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.chart {
    width: 100%;
    min-height: 420px;
    border-radius: var(--radius-md);
    background-color: #fff;
    border: 1px solid var(--border-color);
}

.chart--large {
    min-height: 850px;
    /* 원하는 크기로 조정 가능:
       800px - 작은 크기
       850px - 중간 크기 (현재 설정)
       1000px - 큰 크기
       1200px - 매우 큰 크기
       calc(100vh - 400px) - 화면 높이 기준 동적 크기 */
}

.chart .svg-container {
    border-radius: var(--radius-md);
}

.upload-control-wrapper {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
}

.upload-section {
    flex: 0 0 320px;
}

.control-section {
    flex: 1;
    display: flex;
    gap: 2rem;
    opacity: 0.45;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

.control-section.enabled {
    opacity: 1;
    pointer-events: auto;
}

.control-section .control-item {
    flex: 1;
}

.control-section .control-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

.marker-controls {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.marker-form {
    display: flex;
    flex-direction: column;
    gap: 1.1rem;
    margin-bottom: 1.5rem;
}

.marker-form-row {
    display: flex;
    flex-wrap: wrap;
    gap: 1.25rem;
}

.marker-form-group {
    flex: 1 1 220px;
    display: flex;
    flex-direction: column;
    gap: 0.45rem;
}

.marker-form-group label {
    font-weight: 600;
    color: var(--text-secondary);
}

.marker-frequency-input {
    display: flex;
    align-items: stretch;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: #fff;
    overflow: hidden;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.marker-frequency-input:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(82, 82, 82, 0.15);
}

.marker-frequency-input input {
    flex: 1;
    padding: 0.65rem 0.75rem;
    border: none;
    font-size: 0.95rem;
    background-color: transparent;
}

.marker-frequency-input .unit {
    display: inline-flex;
    align-items: center;
    padding: 0 0.85rem;
    background-color: var(--accent-soft);
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9rem;
}

.marker-form .help-text {
    margin-top: -0.25rem;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-md);
    border: none;
    background-color: var(--text-secondary);
    color: #fff;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease;
}

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

.button--primary:hover:not(:disabled) {
    background-color: #404040;
}

.button:hover {
    background-color: #404040;
}

.button:disabled {
    background-color: #e5e5e5;
    cursor: not-allowed;
}

.button--primary:disabled {
    background-color: #d4d4d4;
    color: rgba(255, 255, 255, 0.8);
}

.marker-count {
    font-weight: 600;
    color: var(--text-secondary);
}

.marker-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.75rem;
}

.marker-empty {
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    border: 1px dashed rgba(0, 0, 0, 0.2);
    background-color: rgba(0, 0, 0, 0.03);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.marker-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: rgba(0, 0, 0, 0.02);
}

.marker-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    font-size: 0.9rem;
}

.marker-actions button {
    background: none;
    border: none;
    color: #737373;
    font-weight: 600;
    cursor: pointer;
    padding: 0.35rem 0.6rem;
    border-radius: 8px;
    transition: background-color 0.2s ease;
}

.marker-actions button:hover {
    background-color: rgba(0, 0, 0, 0.08);
    color: #171717;
}

.app-footer {
    padding: 2rem 0 3rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .panel {
        padding: 1.5rem;
    }

    .upload-control-wrapper {
        flex-direction: column;
    }

    .upload-section {
        flex: 1 1 auto;
        width: 100%;
    }

    .control-section {
        flex-direction: column;
    }

    .chart-header-content {
        flex-direction: column;
        align-items: stretch;
    }

    .axis-settings-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .axis-settings-actions {
        flex-direction: column;
    }

    .axis-settings-actions .button {
        width: 100%;
    }

    .marker-form-row {
        flex-direction: column;
    }

    .marker-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.6rem;
    }

    .marker-actions {
        align-self: flex-end;
    }

    .chart--large {
        min-height: 450px;
    }
}