/* Light Theme based on Wireframes */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --border-color: #333333;
    --purple: #5c425c;
    --purple-light: #f4eaf4;
    --yellow: #e8dbad;
    --green: #4ca64c;
    --red: #d9534f;
    --gray-bg: #e6e6e6;
    --gray-dark: #8c8c8c;
    --graph-bg: #aec1ae; /* Muted greenish-gray from the graph background */
    --font-main: 'Montserrat', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.logo h1 {
    font-size: 28px;
    font-weight: 500;
}

.logo p {
    font-size: 14px;
    color: var(--gray-dark);
}

.vector-logo {
    border: 1.5px solid var(--border-color);
    padding: 10px 15px;
    text-align: center;
    font-size: 14px;
    font-weight: 500;
}

/* Navigation */
.tabs {
    display: flex;
    gap: 20px;
    justify-content: center;
}

.tab {
    border: 1.5px solid var(--border-color);
    background: none;
    padding: 8px 30px;
    font-size: 16px;
    cursor: pointer;
    font-family: var(--font-main);
}

.tab.active {
    background-color: var(--purple);
    color: white;
}

/* Toggles Row */
.toggles-row {
    display: flex;
    justify-content: space-between;
    gap: 10px;
}

.toggle-group {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
}

.toggle-btn {
    flex: 1;
    border: 1.5px solid var(--border-color);
    background: none;
    padding: 8px 10px;
    font-size: 14px;
    cursor: pointer;
    font-family: var(--font-main);
}

.toggle-btn.active {
    background-color: var(--gray-dark);
    color: white;
}

.or {
    font-weight: bold;
    font-size: 14px;
}

/* Box styles */
.box {
    border: 1.5px solid var(--border-color);
    padding: 10px;
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.box-title {
    position: absolute;
    top: -10px;
    background: var(--bg-color);
    padding: 0 5px;
    font-size: 12px;
}

/* Models and Variables Row */
.models-vars-row {
    display: flex;
    gap: 20px;
}

.models-box {
    flex: 1;
    display: flex;
    flex-direction: row;
    gap: 10px;
}

.model-btn {
    border: 1.5px solid var(--border-color);
    background: none;
    padding: 8px 15px;
    font-family: var(--font-main);
    cursor: pointer;
}

.model-btn.active {
    background-color: var(--yellow);
}

.model-btn.inactive {
    color: var(--gray-dark);
    border-color: var(--gray-dark);
    background-color: #f9f9f9;
}

.vars-box {
    flex: 3;
    padding: 20px 10px;
}

/* Custom Tile Equation Engine */
.equation {
    display: flex;
    align-items: center;
    gap: 5px;
    flex-wrap: wrap;
    justify-content: center;
    font-size: 14px;
}

.tile {
    border: 1.5px solid var(--border-color);
    padding: 4px 8px;
    font-family: var(--font-main);
    font-weight: 500;
}

.tile.yellow {
    background-color: var(--yellow);
}

.cursor-pointer {
    cursor: pointer;
    transition: all 0.2s ease;
}

.cursor-pointer:hover {
    transform: translateY(-2px);
}

.tile.lightgray {
    background-color: var(--gray-bg);
}

.tile.outline {
    background-color: var(--bg-color);
}

.tile.yellow-fill {
    background-color: var(--yellow);
}

.op, .bracket {
    font-weight: 400;
}

.fraction {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.fraction hr {
    width: 100%;
    border: none;
    border-top: 1.5px solid var(--border-color);
}

.fraction-bottom {
    display: flex;
    gap: 2px;
}

.fraction-inline {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    margin: 0 5px;
}

.fraction-inline hr {
    width: 100%;
    border: none;
    border-top: 1.5px solid var(--border-color);
}

.big-bracket {
    font-size: 40px;
    font-weight: 300;
    line-height: 1;
}

/* Summary Row */
.summary-row {
    display: flex;
    gap: 20px;
}

.summary-box {
    flex: 1;
    padding: 20px;
}

.yellow-bg {
    background-color: var(--yellow);
}

.icons {
    display: flex;
    gap: 15px;
}

/* Three Column Layout */
.three-col {
    display: flex;
    gap: 20px;
    align-items: stretch;
}

.col {
    border: 1.5px solid var(--border-color);
    padding: 15px;
}

.side-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
    justify-content: flex-start;
}

.graph-col {
    flex: 2;
    background-color: var(--graph-bg);
    position: relative;
    padding: 0;
}

.graph-tag {
    position: absolute;
    top: 5px;
    right: 5px;
    border: 1.5px solid var(--border-color);
    padding: 4px 8px;
    font-size: 12px;
    background-color: rgba(255, 255, 255, 0.5);
}

.control-row {
    display: flex;
    align-items: center;
    gap: 5px;
    border: 1.5px solid var(--border-color);
    padding: 5px;
    background-color: white;
}

.number {
    font-size: 12px;
    padding: 0 5px;
}

.circle {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1.5px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    cursor: pointer;
    color: white;
}

.circle.up.active {
    background-color: var(--green);
}

.circle.down.active {
    background-color: var(--red);
}

.circle.minus.active {
    background-color: #ffd700; /* yellow-ish warning */
    color: black;
}

.circle.inactive {
    background-color: var(--gray-dark);
}

.output-circles {
    display: flex;
    gap: 5px;
}

.variable-info {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px;
    width: 100%;
    padding-top: 15px;
    border-top: 1px dashed var(--border-color);
}

.var-item {
    font-size: 11px;
    line-height: 1.4;
    color: #555;
}

.var-item b {
    color: var(--purple);
    font-weight: 600;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .three-col {
        flex-direction: column;
    }
    
    .graph-col {
        order: -1;
        min-height: 350px;
        margin-bottom: 20px;
    }
    
    .side-col {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
        padding: 10px;
    }
    
    .models-vars-row, .summary-row, .toggles-row {
        flex-direction: column;
    }
    
    .toggle-group {
        width: 100%;
    }
    
    .container {
        padding: 10px;
    }
}

.model-description {
    font-size: 11px;
    line-height: 1.3;
    color: #666;
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--border-color);
    text-align: center;
}

.site-footer {
    margin-top: 30px;
    padding: 20px;
    text-align: center;
    font-size: 12px;
    color: var(--gray-dark);
    border-top: 1.5px solid var(--border-color);
}

.site-footer i {
    color: var(--purple);
}