:root {
    --bg-color: #000000;
    --card-bg: #16181c;
    --border-color: #2f3336;
    --text-primary: #e7e9ea;
    --text-secondary: #71767b;
    --accent-color: #1d9bf0;
    --accent-glow: rgba(29, 155, 240, 0.2);
    --success-color: #00ba7c;
    --warning-color: #ffd400;
    --error-color: #f4212e;
    --stage-bg: #1d9bf010;
    --history-color: #71767b;
    --candidate-color: #1d9bf0;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-heading: 'Outfit', var(--font-main);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
}

body.dark-mode {
    --bg-color: #000000;
    --text-primary: #f7f9f9;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(12px);
    z-index: 100;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.x-logo {
    width: 24px;
    height: 24px;
    fill: currentColor;
}

h1 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

nav {
    display: flex;
    gap: 8px;
}

.nav-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-family: var(--font-main);
    font-weight: 600;
    cursor: pointer;
    border-radius: 9999px;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.nav-btn.active {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.15);
}

main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    width: 100%;
}

.view {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.view-header {
    margin-bottom: 3rem;
    text-align: center;
}

.view-header h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.view-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Pipeline Viz */
.pipeline-container {
    overflow-x: auto;
    padding: 2rem 0;
    margin-bottom: 3rem;
}

.pipeline-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-width: 1000px;
}

.stage {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.5rem;
    width: 180px;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    cursor: pointer;
    position: relative;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.stage:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.stage.active {
    border-color: var(--accent-color);
    background-color: var(--stage-bg);
}

.stage-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.stage h3 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    font-family: var(--font-heading);
}

.stage p {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.3;
}

.sub-stages {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
}

.sub-stage {
    font-size: 0.7rem;
    background: rgba(255, 255, 255, 0.05);
    padding: 2px 6px;
    border-radius: 4px;
}

.sub-stage span {
    font-weight: 700;
}

.connector {
    flex: 1;
    height: 2px;
    background: linear-gradient(90deg, var(--border-color), var(--accent-color), var(--border-color));
    background-size: 200% 100%;
    animation: flow 2s linear infinite;
}

@keyframes flow {
    0% {
        background-position: 100% 0;
    }

    100% {
        background-position: -100% 0;
    }
}

.details-panel {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    min-height: 200px;
}

.placeholder-text {
    color: var(--text-secondary);
    text-align: center;
}

.detail-content h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
    font-family: var(--font-heading);
}

.code-snippet {
    background: #000;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    font-family: monospace;
    font-size: 0.85rem;
    margin: 1rem 0;
    color: #88ccff;
    border-left: 3px solid var(--accent-color);
}

/* Model View Utils */
.model-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 2rem;
}

.card {
    background: var(--card-bg);
    border-radius: 20px;
    border: 1px solid var(--border-color);
    padding: 2rem;
}

.card h3 {
    font-family: var(--font-heading);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.matrix-viz {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
    gap: 4px;
    margin-bottom: 1.5rem;
    aspect-ratio: 1;
}

.matrix-cell {
    border-radius: 2px;
    aspect-ratio: 1;
    transition: all 0.2s;
}

.matrix-cell.history {
    background-color: var(--history-color);
    opacity: 0.4;
}

.matrix-cell.cand {
    background-color: var(--candidate-color);
}

.matrix-cell.mask {
    background-color: var(--border-color);
    opacity: 0.1;
}

.viz-legend {
    display: flex;
    gap: 1.5rem;
    font-size: 0.8rem;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.box {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    display: inline-block;
}

.box.history {
    background: var(--history-color);
}

.box.cand {
    background: var(--candidate-color);
}

.box.mask {
    background: var(--border-color);
    opacity: 0.4;
}

.actions-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.action-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.action-label {
    font-size: 0.9rem;
    font-weight: 500;
}

.action-bar-container {
    flex: 1;
    height: 8px;
    background: rgba(255, 255, 255, 0.05);
    margin: 0 1rem;
    border-radius: 4px;
    overflow: hidden;
}

.action-bar {
    height: 100%;
    background: var(--accent-color);
    border-radius: 4px;
}

.action-val {
    font-size: 0.8rem;
    font-family: monospace;
    width: 40px;
    text-align: right;
    color: var(--text-secondary);
}

/* Simulator View Utils */
.simulator-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 2rem;
}

.controls-panel h3,
.feed-panel h3 {
    font-family: var(--font-heading);
    margin-bottom: 1.5rem;
}

.weight-sliders {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.slider-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.slider-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
}

input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    height: 18px;
    width: 18px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    margin-top: -6px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
}

.reset-btn {
    margin-top: 2rem;
    width: 100%;
    padding: 0.8rem;
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 9999px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.reset-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

.feed-items {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.feed-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem;
    display: flex;
    gap: 12px;
    animation: listSlide 0.3s ease-out backwards;
}

@keyframes listSlide {
    from {
        opacity: 0;
        transform: translateX(20px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.post-rank {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-secondary);
    min-width: 40px;
}

.post-content {
    flex: 1;
}

.post-author {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.post-author span {
    color: var(--text-secondary);
    font-weight: 400;
    font-size: 0.85rem;
    margin-left: 4px;
}

.post-text {
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.post-stats {
    display: flex;
    gap: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.post-score {
    background: var(--stage-bg);
    color: var(--accent-color);
    padding: 4px 10px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.8rem;
}

footer {
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: var(--accent-color);
    text-decoration: none;
}

@media (max-width: 900px) {

    .model-grid,
    .simulator-layout {
        grid-template-columns: 1fr;
    }
}