:root {
    /* Red Culture Theme */
    --app-bg: #fdfbf7;
    --sidebar-bg: rgba(255, 248, 240, 0.8);
    --glass-border: rgba(214, 59, 29, 0.2);
    --text-primary: #8b0000;
    --text-secondary: #a05a5a;
    --accent-red: #d63b1d;
    --accent-gold: #ffb400;
    --accent-hover: #b32b12;
    --danger-red: #ff3b30;
    --success-green: #27c93f;

    /* Lattice Colors */
    --node-default: #fff8f0;
    --node-border: #d63b1d;
    --node-selected: #ffb400;
    --node-result: #27c93f;
    --node-sublattice: #ff8c75;
    --edge-color: rgba(214, 59, 29, 0.4);
    --edge-highlight: #d63b1d;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(139, 0, 0, 0.08);
    --shadow-md: 0 8px 24px rgba(139, 0, 0, 0.12);
    --shadow-lg: 0 20px 40px rgba(139, 0, 0, 0.15);

    --font-family: "Noto Serif SC", "Outfit", serif;
    --font-title: "Ma Shan Zheng", cursive;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--app-bg);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: url('https://images.unsplash.com/photo-1533038590840-1cde6e668a91?q=80&w=2574&auto=format&fit=crop');
    background-size: cover;
    background-position: center;
}

.app-container {
    width: 90vw;
    height: 85vh;
    max-width: 1400px;
    background: rgba(255, 252, 245, 0.85);
    backdrop-filter: blur(20px) saturate(120%);
    -webkit-backdrop-filter: blur(20px) saturate(120%);
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-lg);
    display: flex;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 340px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--glass-border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 1rem;
    flex-shrink: 0;
    overflow-y: auto;
}

.sidebar-header {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.window-controls {
    display: flex;
    gap: 8px;
    margin-bottom: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background: #ff5f56;
    border: 1px solid #e0443e;
}

.dot.yellow {
    background: #ffbd2e;
    border: 1px solid #dea123;
}

.dot.green {
    background: #27c93f;
    border: 1px solid #1aab29;
}

h1 {
    font-family: var(--font-title);
    font-size: 1.8rem;
    font-weight: 400;
    color: var(--text-primary);
    letter-spacing: 0.05em;
}

.subtitle {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: -5px;
}

.highlight {
    color: var(--accent-red);
}

.controls-wrapper {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Select */
.apple-select {
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid rgba(139, 0, 0, 0.2);
    background: rgba(255, 255, 255, 0.6);
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238b0000' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px center;
}

.apple-select:hover {
    border-color: var(--accent-red);
    background: rgba(255, 255, 255, 0.8);
}

.apple-select:focus {
    outline: 2px solid var(--accent-red);
    outline-offset: 2px;
}

/* Concept Buttons */
.concept-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.concept-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid var(--accent-red);
    background: rgba(255, 255, 255, 0.5);
    color: var(--accent-red);
    font-family: var(--font-family);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.concept-btn .icon {
    font-size: 1.1rem;
}

.concept-btn:hover {
    background: var(--accent-red);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.concept-btn.active {
    background: var(--accent-red);
    color: white;
    box-shadow: var(--shadow-sm);
}

/* Operation Panel */
.operation-selector {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.selected-elements {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
}

.element-slot {
    flex: 1;
    background: rgba(255, 255, 255, 0.6);
    border: 2px dashed rgba(139, 0, 0, 0.2);
    border-radius: 10px;
    padding: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-height: 60px;
    transition: all 0.3s ease;
}

.element-slot.filled {
    border-style: solid;
    border-color: var(--accent-red);
    background: rgba(214, 59, 29, 0.05);
}

.slot-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.slot-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--accent-red);
}

.operation-symbol {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-gold);
}

.result-display {
    background: rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(139, 0, 0, 0.1);
    border-radius: 10px;
    padding: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 50px;
}

.result-icon {
    font-size: 1.2rem;
    color: var(--accent-gold);
}

.result-value {
    font-size: 1rem;
    font-weight: 700;
    color: var(--accent-red);
    flex: 1;
}

/* Property List */
.property-list {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.property-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 8px;
    border: 1px solid rgba(139, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.badge-icon {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: rgba(139, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-secondary);
}

.badge-text {
    font-size: 0.75rem;
    color: var(--text-primary);
    font-weight: 600;
}

.property-badge.active {
    border-color: var(--success-green);
    background: rgba(39, 201, 63, 0.05);
}

.property-badge.active .badge-icon {
    background: var(--success-green);
    color: white;
}

/* Buttons */
.apple-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    font-family: var(--font-family);
    gap: 8px;
}

.compute-btn {
    background: var(--accent-gold);
    color: var(--text-primary);
    width: 100%;
    box-shadow: var(--shadow-sm);
}

.compute-btn:hover {
    background: #ffc933;
    transform: translateY(-1px);
}

.action-btn {
    background: var(--accent-red);
    color: white;
    width: 100%;
    box-shadow: var(--shadow-md);
}

.action-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.danger-btn {
    background: rgba(139, 0, 0, 0.1);
    color: var(--text-primary);
    width: 100%;
}

.danger-btn:hover {
    background: rgba(139, 0, 0, 0.2);
}

.apple-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* Ideological Panel */
.ideological-panel {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ideology-card {
    background: linear-gradient(135deg, rgba(214, 59, 29, 0.05), rgba(255, 180, 0, 0.05));
    border: 1px solid rgba(214, 59, 29, 0.2);
    border-radius: 12px;
    padding: 12px;
    transition: all 0.3s ease;
}

.ideology-card.active {
    border-color: var(--accent-red);
    box-shadow: var(--shadow-sm);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.card-icon {
    font-size: 1.2rem;
    color: var(--accent-gold);
}

.card-title {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-red);
}

.card-content {
    font-size: 0.75rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

/* Stats Panel */
.stats-panel {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    padding: 12px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 12px;
    border: 1px solid rgba(139, 0, 0, 0.1);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-label {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    font-weight: 600;
}

.stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-red);
}

/* Main Stage */
.visualizer-stage {
    flex-grow: 1;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
}

.glass-pane {
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.4);
    border-radius: 16px;
    box-shadow: inset 0 0 20px rgba(255, 255, 255, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 2rem;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.visualization-header {
    margin-bottom: 1.5rem;
    text-align: center;
}

.visualization-header h2 {
    font-family: var(--font-title);
    font-size: 1.8rem;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

#vizSubtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-style: italic;
}

.viz-area {
    flex-grow: 1;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 0;
}

/* Welcome State */
.welcome-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
    opacity: 0.8;
}

.tower-animation {
    width: 250px;
    height: 250px;
}

.tower-svg {
    width: 100%;
    height: 100%;
}

.tower-level {
    animation: towerRise 4s ease-in-out infinite;
}

@keyframes towerRise {

    0%,
    100% {
        transform: translateY(0);
        opacity: 1;
    }

    50% {
        transform: translateY(-5px);
        opacity: 0.8;
    }
}

.tower-star {
    animation: starTwinkle 2s ease-in-out infinite;
}

@keyframes starTwinkle {

    0%,
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }

    50% {
        transform: scale(1.2) rotate(180deg);
        opacity: 0.6;
    }
}

.welcome-text {
    font-size: 1rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Legend Panel */
.legend-panel {
    position: absolute;
    bottom: 2rem;
    right: 2rem;
    background: rgba(255, 248, 240, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    padding: 1rem;
    box-shadow: var(--shadow-md);
}

.legend-panel h3 {
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--accent-red);
    margin-bottom: 0.8rem;
    text-transform: uppercase;
}

.legend-items {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-symbol {
    width: 20px;
    height: 20px;
    border-radius: 50%;
}

.node-symbol {
    background: var(--node-default);
    border: 2px solid var(--node-border);
}

.edge-symbol {
    width: 20px;
    height: 3px;
    background: var(--edge-color);
    border-radius: 0;
}

.selected-symbol {
    background: var(--node-selected);
    border: 2px solid var(--accent-gold);
}

.result-symbol {
    background: var(--node-result);
    border: 2px solid var(--success-green);
}

.legend-text {
    font-size: 0.75rem;
    color: var(--text-primary);
}

/* Hasse Diagram */
.hasse-diagram {
    width: 100%;
    height: 100%;
    position: relative;
}

.lattice-node {
    position: absolute;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--node-default);
    border: 3px solid var(--node-border);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.lattice-node:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-md);
    z-index: 20;
}

.lattice-node.selected {
    background: var(--node-selected);
    border-color: var(--accent-gold);
    box-shadow: 0 0 0 4px rgba(255, 180, 0, 0.3);
}

.lattice-node.result {
    background: var(--node-result);
    border-color: var(--success-green);
    animation: resultPulse 1s ease-in-out;
}

@keyframes resultPulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.3);
    }
}

.lattice-node.sublattice {
    background: var(--node-sublattice);
    border-color: #ff6347;
}

.lattice-edge-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.lattice-edge {
    stroke: var(--edge-color);
    stroke-width: 2;
    transition: all 0.3s ease;
}

.lattice-edge.highlight {
    stroke: var(--edge-highlight);
    stroke-width: 3;
}

/* Footer */
.actions-footer {
    display: flex;
    gap: 10px;
}

/* Scrollbar */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: rgba(139, 0, 0, 0.05);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--accent-red);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}