:root {
    --bg-dark: #121212;
    --bg-panel: #1e1e1e;
    --bg-sidebar: #181818;
    --primary: #bb86fc;
    --secondary: #03dac6;
    --error: #cf6679;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --border: #333;
    --input-bg: #2c2c2c;

    --font-inter: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    font-family: var(--font-inter);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100%;
}

/* Sidebar */
.sidebar {
    width: 250px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
}

.logo h1 {
    color: var(--primary);
    font-size: 1.5rem;
    font-weight: 700;
}

.logo p {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-bottom: 2rem;
}

.sequence-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex: 1;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.75rem 1rem;
    text-align: left;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 500;
}

.nav-btn:hover {
    background-color: rgba(187, 134, 252, 0.1);
    color: var(--text-main);
}

.nav-btn.active {
    background-color: rgba(187, 134, 252, 0.2);
    color: var(--primary);
    font-weight: 600;
}

.info-box {
    margin-top: auto;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.info-box a {
    color: var(--secondary);
    text-decoration: none;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1.5rem;
    overflow-y: auto;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    padding-bottom: 1rem;
}

.top-bar h2 {
    font-weight: 600;
}

.plot-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.control-group-inline {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
}

.separator-vertical {
    width: 1px;
    height: 24px;
    background-color: var(--border);
}

.plot-controls select {
    background-color: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-family: inherit;
    font-size: 0.9rem;
    min-width: 160px;
}

.small-input {
    background-color: var(--input-bg);
    color: var(--text-main);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 0.2rem 0.4rem;
    font-family: inherit;
    width: 60px;
    font-size: 0.85rem;
}

/* Content Grid */
.content-grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 1.5rem;
    flex: 1;
    min-height: 0;
}

/* Tissue Panel (Left) */
.tissue-panel {
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 1.5rem;
    overflow-y: auto;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
}

/* Workspace Panel (Right) */
.workspace-panel {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
}

.controls-bar {
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    border: 1px solid var(--border);
}

.compact-block {
    margin-bottom: 0;
}

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

/* Params Panel - Deprecated, using tissue-panel and controls-bar */
.controls-panel {
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 1.5rem;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.section-block {
    margin-bottom: 2rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.section-block h3 {
    font-size: 0.95rem;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: 0;
}

.icon-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-main);
    width: 28px;
    height: 28px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.2rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #000;
}

.tissue-card {
    background-color: #252525;
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    position: relative;
}

.tissue-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.tissue-name-input {
    background: transparent;
    border: none;
    color: var(--primary);
    font-weight: 600;
    font-family: inherit;
    font-size: 0.9rem;
    width: 70%;
}

.tissue-remove-btn {
    color: var(--error);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    opacity: 0.7;
}

.tissue-remove-btn:hover {
    opacity: 1;
}

.control-group {
    margin-bottom: 1rem;
}

.control-group.compact {
    margin-bottom: 0.5rem;
}

.control-label-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.3rem;
    font-size: 0.8rem;
}

.param-name {
    font-weight: 500;
    color: var(--text-muted);
}

.param-input {
    background-color: var(--input-bg);
    color: var(--secondary);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 2px 6px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    width: 70px;
    text-align: right;
    outline: none;
}

.param-input:focus {
    border-color: var(--primary);
}

.slider-input {
    width: 100%;
    -webkit-appearance: none;
    height: 4px;
    background: #444;
    border-radius: 2px;
    outline: none;
}

.slider-input::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    background: var(--text-muted);
    cursor: pointer;
    transition: transform 0.1s;
}

.slider-input::-webkit-slider-thumb:hover {
    background: var(--primary);
    transform: scale(1.2);
}

/* Graph Panel */
.graph-panel {
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 1rem;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 400px;
}

.chart-container {
    flex: 1;
    position: relative;
    width: 100%;
}

.contrast-box {
    margin-top: 1rem;
    padding: 1rem;
    background-color: #252525;
    border-radius: 8px;
    border: 1px solid var(--border);
    font-size: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    /* Allow grouping */
    gap: 1.5rem;
    align-items: center;
    justify-content: center;
    min-height: 50px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.stat-value {
    font-size: 1.1rem;
    color: var(--secondary);
    font-weight: 600;
}

/* Equation Panel */
.equation-panel {
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    border: 1px solid var(--border);
}

.equation-panel h3 {
    font-size: 0.85rem;
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.equation-box {
    font-family: 'Times New Roman', Times, serif;
    font-size: 1.2rem;
    font-style: italic;
    color: #fff;
    text-align: center;
}

/* Responsive */
@media (max-width: 900px) {
    .content-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto 400px;
    }
}

.citation-text {
    margin-top: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
    border-top: 1px solid #333;
    padding-top: 0.5rem;
}

/* Reference Panel */
.reference-panel {
    background-color: var(--bg-panel);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border);
    flex: 1;
    overflow-y: auto;
}

.reference-panel h3 {
    color: var(--secondary);
    margin-bottom: 1rem;
}

.ref-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    color: var(--text-main);
}

.ref-table th,
.ref-table td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    text-align: left;
}

.ref-table th {
    background-color: #2c2c2c;
    color: var(--primary);
    font-weight: 600;
}

.row-group-start td {
    border-top: 2px solid #444;
}

.field-col {
    font-weight: 700;
    color: #fff;
    background-color: #252525;
    vertical-align: middle;
    text-align: center;
}

.preset-load-btn {
    margin-top: 0.5rem;
    background-color: var(--primary-dark);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background 0.2s;
}

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