: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;

    /* Mapping Colors */
    --source-color: #d63b1d;
    --target-color: #ffb400;
    --kernel-color: #8b0000;
    --image-color: #ff8c75;
    --arrow-color: rgba(214, 59, 29, 0.6);

    /* 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: 1.2rem;
    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;
}

/* Property Checker */
.property-checker {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 0.5rem;
}

.check-item {
    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;
}

.check-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(139, 0, 0, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--text-secondary);
    transition: all 0.3s ease;
}

.check-label {
    font-size: 0.75rem;
    color: var(--text-primary);
    flex: 1;
}

.check-item.valid {
    border-color: var(--success-green);
    background: rgba(39, 201, 63, 0.05);
}

.check-item.valid .check-icon {
    background: var(--success-green);
    color: white;
}

.check-item.invalid {
    border-color: var(--danger-red);
    background: rgba(255, 59, 48, 0.05);
}

.check-item.invalid .check-icon {
    background: var(--danger-red);
    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;
}

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

.verify-btn:hover {
    background: #ffc933;
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.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: 1.5rem;
    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;
}

.bridge-animation {
    width: 300px;
    height: 150px;
}

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

.bridge-path {
    stroke-dasharray: 300;
    stroke-dashoffset: 300;
    animation: drawBridge 3s ease-in-out infinite;
}

@keyframes drawBridge {

    0%,
    100% {
        stroke-dashoffset: 300;
    }

    50% {
        stroke-dashoffset: 0;
    }
}

.bridge-point {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {

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

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

.bridge-label {
    font-size: 0.9rem;
    fill: var(--text-primary);
    font-weight: 700;
    font-family: var(--font-family);
}

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

/* Info Panel */
.info-panel {
    position: absolute;
    top: 2rem;
    right: 2rem;
    width: 280px;
    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);
}

.info-panel h3 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--accent-red);
    margin-bottom: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.info-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.info-text {
    font-size: 0.8rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.info-formula {
    background: rgba(214, 59, 29, 0.05);
    padding: 8px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    color: var(--accent-red);
    text-align: center;
    border: 1px solid rgba(214, 59, 29, 0.1);
}

/* Mapping Visualization */
.mapping-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: space-around;
    align-items: center;
    position: relative;
}

.ring-set {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.ring-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-title);
}

.ring-elements {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 1.5rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    border: 2px solid var(--source-color);
    min-width: 100px;
    max-height: 400px;
    overflow-y: auto;
}

.ring-elements.target {
    border-color: var(--target-color);
}

.element-item {
    padding: 8px 16px;
    background: var(--source-color);
    color: white;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.element-item:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.element-item.target {
    background: var(--target-color);
    color: var(--text-primary);
}

.element-item.kernel {
    background: var(--kernel-color);
}

.element-item.image {
    background: var(--image-color);
}

.element-item.selected {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.5);
}

/* Arrow Connections */
.arrow-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 1;
}

.mapping-arrow {
    stroke: var(--arrow-color);
    stroke-width: 2;
    fill: none;
    marker-end: url(#arrowhead);
    animation: flowArrow 2s ease-in-out infinite;
}

@keyframes flowArrow {

    0%,
    100% {
        stroke-dashoffset: 0;
    }

    50% {
        stroke-dashoffset: 10;
    }
}

.arrow-label {
    font-size: 0.75rem;
    fill: var(--accent-red);
    font-weight: 700;
}

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

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

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

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

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