:root {
    --bg-dark: #0f0f13;
    --bg-panel: #1a1a22;
    --bg-accent: #252531;
    --accent-green: #7cff9d;
    --text-main: #e0e0e6;
    --text-dim: #9494a3;
    --border-color: #323240;
    --sidebar-width: 320px;
    --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
}

body, html {
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: var(--bg-dark);
    font-family: 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-main);
}

.app-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* SIDEBAR */
.sidebar {
    width: var(--sidebar-width);
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    z-index: 10;
    transition: var(--transition);
}

.brand-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.brand {
    padding: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border-color);
}

.brand-logo {
    height: 32px;
    width: 32px;
    border-radius: 50%;
    border: 2px solid var(--accent-green);
}

.brand-text {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.main-title {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--accent-green);
    line-height: 1.2;
}

.sub-title {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.social-icon {
    height: 20px;
    width: 20px;
    opacity: 0.7;
    transition: var(--transition);
}

.brand-link:hover .social-icon {
    opacity: 1;
    transform: scale(1.1);
}

/* UPLOAD ZONE */
.upload-zone {
    margin: 20px;
    padding: 30px 20px;
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
    background: var(--bg-accent);
}

.upload-zone:hover, .upload-zone.dragover {
    border-color: var(--accent-green);
    background: #2a2a3a;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.upload-label .icon {
    font-size: 2rem;
}

.upload-label .text {
    font-size: 0.85rem;
    color: var(--text-dim);
}

/* SIDEBAR SECTIONS */
.sidebar-section {
    padding: 0 20px 15px;
    display: flex;
    flex-direction: column;
}

.sidebar-section h3 {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: var(--text-dim);
    margin: 20px 0 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Custom Select for X-Axis */
.custom-select {
    width: 100%;
    background: var(--bg-accent);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.custom-select:focus {
    border-color: var(--accent-green);
}

/* PRESETS GRID */
.presets-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.preset-btn {
    background: var(--bg-accent);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 8px 6px;
    border-radius: 6px;
    font-size: 0.7rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.preset-btn:hover {
    border-color: var(--accent-green);
    background: #2d2d3d;
}

/* Search Container */
.search-container {
    margin-bottom: 12px;
}

#sensorSearch {
    width: 100%;
    background: var(--bg-accent);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 8px 12px;
    color: var(--text-main);
    font-size: 0.85rem;
    outline: none;
    transition: var(--transition);
}

#sensorSearch:focus {
    border-color: var(--accent-green);
}

/* COLUMN SELECTOR */
.column-selector {
    flex-grow: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-right: 8px;
    /* Adjusted to allow more room for other sections */
    max-height: 35vh; 
}

.column-selector::-webkit-scrollbar {
    width: 4px;
}
.column-selector::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.col-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 12px;
    background: var(--bg-accent);
    border: 1px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.85rem;
}

.col-item:hover {
    background: #2d2d3d;
}

.col-item.active {
    border-color: var(--accent-green);
    background: rgba(124, 255, 157, 0.05);
}

.col-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.col-checkbox {
    width: 14px;
    height: 14px;
    border: 1px solid var(--text-dim);
    border-radius: 3px;
    position: relative;
}

.col-item.active .col-checkbox {
    background: var(--accent-green);
    border-color: var(--accent-green);
}

.col-item.active .col-checkbox::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 10px;
    color: var(--bg-dark);
    font-weight: bold;
}

.axis-toggle {
    font-size: 0.7rem;
    padding: 2px 6px;
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    color: var(--text-dim);
    border-radius: 4px;
    cursor: pointer;
}

.axis-toggle.y2 {
    color: var(--accent-green);
    border-color: var(--accent-green);
}

.empty-msg {
    font-size: 0.8rem;
    color: var(--text-dim);
    text-align: center;
    margin-top: 20px;
    font-style: italic;
}

/* FOOTER */
.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.export-btn {
    width: 100%;
    background: var(--accent-green);
    color: var(--bg-dark);
    border: none;
    padding: 10px;
    border-radius: 6px;
    font-weight: bold;
    font-size: 0.85rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: var(--transition);
}

.export-btn:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
}

.status-bar {
    font-size: 0.75rem;
    color: var(--text-dim);
    text-align: center;
}

/* MAIN CONTENT */
.main-content {
    flex-grow: 1;
    position: relative;
    background-color: var(--bg-dark);
}

#chart {
    width: 100%;
    height: 100%;
}