/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.7);

    --accent-blue: #3b82f6;
    --accent-blue-light: #60a5fa;
    --accent-blue-glow: rgba(59, 130, 246, 0.3);
    --accent-green: #22c55e;
    --accent-yellow: #eab308;
    --accent-red: #ef4444;
    --accent-purple: #a855f7;

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-subtle: rgba(148, 163, 184, 0.1);
    --border-active: rgba(59, 130, 246, 0.4);

    --glass-bg: rgba(15, 23, 42, 0.6);
    --glass-border: rgba(148, 163, 184, 0.15);
    --glass-blur: 12px;

    --font-body: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-mono: 'Cascadia Code', 'Fira Code', 'Consolas', monospace;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 600ms ease;

    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px var(--accent-blue-glow);
}

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    min-height: 100vh;
    background-image:
        linear-gradient(rgba(59, 130, 246, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59, 130, 246, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

/* ---------- Glass Card ---------- */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(var(--glass-blur));
    -webkit-backdrop-filter: blur(var(--glass-blur));
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--space-lg);
    transition: border-color var(--transition-normal),
        box-shadow var(--transition-normal);
}

/* ---------- Header ---------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 23, 0.85);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(59, 130, 246, 0.2);
    padding: var(--space-sm) var(--space-xl);
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4),
        0 1px 0 rgba(59, 130, 246, 0.1) inset;
    animation: header-slide-down 0.6s ease;
}

@keyframes header-slide-down {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

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

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.header-icon {
    font-size: 1.3rem;
    color: var(--accent-blue);
    animation: rotate-icon 3s ease-in-out infinite;
    filter: drop-shadow(0 0 8px rgba(59, 130, 246, 0.4));
}

@keyframes rotate-icon {

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

    50% {
        transform: rotate(180deg);
    }
}

.header-left h1 {
    font-size: 1.15rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--accent-blue-light), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.header-subtitle {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.header-nav {
    display: flex;
    gap: var(--space-xs);
    background: rgba(0, 0, 0, 0.3);
    padding: 4px;
    border-radius: var(--radius-sm);
    border: 1px solid rgba(148, 163, 184, 0.1);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-sm);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-fast);
    letter-spacing: 0.3px;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg,
            var(--accent-blue),
            var(--accent-purple),
            var(--accent-blue));
    background-size: 200% 100%;
    transform: translateX(-50%);
    transition: width var(--transition-normal);
    animation: gradient-shift 2s linear infinite;
}

@keyframes gradient-shift {
    0% {
        background-position: 0% 50%;
    }

    100% {
        background-position: 200% 50%;
    }
}

.nav-link::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center,
            rgba(59, 130, 246, 0.15),
            transparent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.12);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.nav-link:hover::before {
    width: 80%;
}

.nav-link:hover::after {
    opacity: 1;
}

.nav-link:active {
    transform: translateY(0);
}

/* Active state for current section */
.nav-link.active {
    color: var(--accent-blue-light);
    background: rgba(59, 130, 246, 0.15);
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.3),
        inset 0 0 8px rgba(59, 130, 246, 0.1);
}

.nav-link.active::before {
    width: 100%;
}

/* ---------- Sections ---------- */
.section {
    padding: var(--space-3xl) var(--space-xl);
}

.section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 1.75rem;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
    position: relative;
    padding-left: var(--space-md);
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 3px;
    background: var(--accent-blue);
    border-radius: 2px;
}

/* ---------- Hero / Controls ---------- */
.hero-section {
    text-align: center;
}

.hero-text {
    max-width: 800px;
    margin: 0 auto var(--space-xl);
}

.hero-text h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--accent-blue-light), var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-text p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.8;
}

.controls-panel {
    max-width: 900px;
    margin: 0 auto;
    text-align: left;
}

.controls-row {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-lg);
    margin-bottom: var(--space-lg);
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.control-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.control-group select {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.control-group select:hover,
.control-group select:focus {
    border-color: var(--accent-blue);
    outline: none;
}

.control-group select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

/* Speed Toggle */
.speed-toggle {
    display: flex;
    gap: 2px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 1px solid var(--border-subtle);
}

.speed-btn {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.speed-btn:hover {
    color: var(--text-secondary);
}

.speed-btn.active {
    background: var(--accent-blue);
    color: white;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--border-subtle);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.85rem;
    transition: border-color var(--transition-fast), background var(--transition-fast);
    min-height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.03);
}

.drop-zone.drag-over {
    border-color: var(--accent-blue);
    background: rgba(59, 130, 246, 0.08);
    border-style: solid;
}

/* Action Buttons */
.controls-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
}

.btn-primary {
    background: var(--accent-blue);
    color: white;
    border: none;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    transition: background var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

.btn-primary:hover:not(:disabled) {
    background: var(--accent-blue-light);
    box-shadow: 0 0 24px var(--accent-blue-glow);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.btn-primary.running {
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple), var(--accent-blue));
    background-size: 200% 100%;
    animation: btn-running 2s linear infinite;
    pointer-events: none;
}

@keyframes btn-running {
    0% {
        background-position: 0% 50%;
    }

    100% {
        background-position: 200% 50%;
    }
}

.btn-secondary {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: border-color var(--transition-fast), color var(--transition-fast);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.btn-secondary:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.btn-demo {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
    color: white;
    border: none;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-body);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    transition: box-shadow var(--transition-fast), transform var(--transition-fast), opacity var(--transition-fast);
}

.btn-demo:hover:not(:disabled) {
    box-shadow: 0 0 24px rgba(168, 85, 247, 0.4);
    transform: translateY(-1px);
}

.btn-demo:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Stats Bar */
.stats-bar {
    display: flex;
    justify-content: center;
    gap: var(--space-2xl);
    margin-top: var(--space-xl);
}

.stat-item {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--accent-blue-light);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ---------- Pipeline Visualization ---------- */
.pipeline-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    padding: var(--space-xl) 0;
    overflow-x: auto;
}

.pipeline-stage {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg) var(--space-md);
    border-radius: var(--radius-lg);
    background: var(--glass-bg);
    border: 2px solid var(--border-subtle);
    min-width: 130px;
    position: relative;
    transition: border-color var(--transition-normal),
        box-shadow var(--transition-normal),
        transform var(--transition-normal),
        opacity var(--transition-normal);
}

.pipeline-stage[data-state="idle"] {
    border-color: var(--border-subtle);
    opacity: 0.5;
}

.pipeline-stage[data-state="active"] {
    border-color: var(--accent-blue);
    box-shadow: 0 0 24px var(--accent-blue-glow),
        inset 0 0 24px rgba(59, 130, 246, 0.05);
    opacity: 1;
    transform: scale(1.06);
    animation: stage-pulse 1.5s ease-in-out infinite;
}

.pipeline-stage[data-state="complete"] {
    border-color: var(--accent-green);
    box-shadow: 0 0 16px rgba(34, 197, 94, 0.2);
    opacity: 1;
}

.pipeline-stage[data-state="error"] {
    border-color: var(--accent-red);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.2);
    opacity: 1;
}

@keyframes stage-pulse {

    0%,
    100% {
        box-shadow: 0 0 24px var(--accent-blue-glow);
    }

    50% {
        box-shadow: 0 0 40px var(--accent-blue-glow), 0 0 60px rgba(59, 130, 246, 0.15);
    }
}

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

.stage-label {
    font-weight: 600;
    font-size: 0.95rem;
}

.stage-description {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.stage-status {
    font-size: 0.7rem;
    font-family: var(--font-mono);
    color: var(--text-secondary);
    padding: 2px 10px;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.05);
}

.pipeline-stage[data-state="active"] .stage-status {
    color: var(--accent-blue-light);
    background: rgba(59, 130, 246, 0.1);
}

.pipeline-stage[data-state="complete"] .stage-status {
    color: var(--accent-green);
    background: rgba(34, 197, 94, 0.1);
}

.pipeline-stage[data-state="error"] .stage-status {
    color: var(--accent-red);
    background: rgba(239, 68, 68, 0.1);
}

/* Connectors */
.pipeline-connector {
    display: flex;
    align-items: center;
    width: 50px;
    position: relative;
}

.connector-line {
    width: 100%;
    height: 2px;
    background: var(--border-subtle);
    position: relative;
    overflow: hidden;
}

.connector-line.active::after {
    content: '';
    position: absolute;
    top: -3px;
    left: -12px;
    width: 12px;
    height: 8px;
    background: var(--accent-blue);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--accent-blue), 0 0 20px var(--accent-blue-glow);
    animation: data-packet 0.8s ease-in-out forwards;
}

@keyframes data-packet {
    0% {
        left: -12px;
        opacity: 0;
    }

    10% {
        opacity: 1;
    }

    90% {
        opacity: 1;
    }

    100% {
        left: calc(100% + 12px);
        opacity: 0;
    }
}

/* Data Preview */
.data-preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    margin-top: var(--space-xl);
}

.data-preview h3 {
    font-size: 0.95rem;
    color: var(--accent-blue-light);
    margin-bottom: var(--space-md);
}

.data-preview pre {
    background: #0d1117;
    border-radius: var(--radius-md);
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    line-height: 1.6;
    color: var(--text-secondary);
    overflow-x: auto;
    max-height: 250px;
    overflow-y: auto;
    border: 1px solid var(--border-subtle);
}

/* ---------- Terminal ---------- */
.terminal-window {
    padding: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
}

.terminal-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-sm) var(--space-md);
    background: rgba(0, 0, 0, 0.4);
    border-bottom: 1px solid var(--border-subtle);
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

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

.dot-red {
    background: #ff5f57;
}

.dot-yellow {
    background: #ffbd2e;
}

.dot-green {
    background: #28c840;
}

.terminal-title {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.terminal-actions {
    display: flex;
    gap: var(--space-sm);
}

.terminal-btn {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    padding: 4px 12px;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

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

.terminal-body {
    padding: var(--space-md);
    font-family: var(--font-mono);
    font-size: 0.8rem;
    line-height: 1.7;
    max-height: 500px;
    min-height: 300px;
    overflow-y: auto;
    background: #0d1117;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-blue) transparent;
}

.terminal-body::-webkit-scrollbar {
    width: 6px;
}

.terminal-body::-webkit-scrollbar-track {
    background: transparent;
}

.terminal-body::-webkit-scrollbar-thumb {
    background: var(--accent-blue);
    border-radius: 3px;
}

.terminal-line {
    white-space: pre-wrap;
    word-break: break-all;
    padding: 1px 0;
    opacity: 0;
    animation: line-appear 0.15s ease forwards;
}

@keyframes line-appear {
    from {
        opacity: 0;
        transform: translateY(4px);
    }

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

/* Terminal color classes */
.t-green {
    color: var(--accent-green);
}

.t-yellow {
    color: var(--accent-yellow);
}

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

.t-blue {
    color: var(--accent-blue-light);
}

.t-muted {
    color: var(--text-muted);
}

.t-bold {
    font-weight: 700;
}

/* ---------- Output / Export ---------- */
.output-panel {
    padding: 0;
    overflow: hidden;
}

.output-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--border-subtle);
    background: rgba(0, 0, 0, 0.2);
}

.output-tabs {
    display: flex;
    gap: var(--space-xs);
}

.output-tab {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-family: var(--font-body);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.output-tab:hover {
    color: var(--text-secondary);
}

.output-tab.active {
    background: rgba(59, 130, 246, 0.1);
    border-color: var(--accent-blue);
    color: var(--accent-blue-light);
}

.export-buttons {
    display: flex;
    gap: var(--space-sm);
}

.btn-export {
    background: rgba(34, 197, 94, 0.08);
    color: var(--accent-green);
    border: 1px solid rgba(34, 197, 94, 0.25);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    font-family: var(--font-body);
    transition: background var(--transition-fast);
}

.btn-export:hover:not(:disabled) {
    background: rgba(34, 197, 94, 0.18);
}

.btn-export:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.output-tab-content {
    display: none;
    padding: var(--space-lg);
}

.output-tab-content.active {
    display: block;
}

/* Table */
.table-wrapper {
    overflow-x: auto;
    max-height: 420px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-blue) transparent;
}

.table-wrapper::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

.table-wrapper::-webkit-scrollbar-thumb {
    background: var(--accent-blue);
    border-radius: 3px;
}

#output-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.82rem;
}

#output-table thead th {
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    font-weight: 600;
    color: var(--accent-blue-light);
    border-bottom: 2px solid var(--accent-blue);
    white-space: nowrap;
    z-index: 1;
}

#output-table tbody td {
    padding: var(--space-sm) var(--space-md);
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    white-space: nowrap;
}

#output-table tbody tr:hover {
    background: rgba(59, 130, 246, 0.05);
}

#output-table tbody tr {
    animation: row-fade-in 0.2s ease forwards;
}

@keyframes row-fade-in {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

.table-footer {
    padding: var(--space-md) var(--space-lg);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* JSON output */
#tab-json pre {
    background: #0d1117;
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.6;
    color: var(--text-secondary);
    overflow: auto;
    max-height: 450px;
    border: 1px solid var(--border-subtle);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-md);
}

.stat-card {
    text-align: center;
    padding: var(--space-lg);
}

.stat-card-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent-blue-light);
    font-family: var(--font-mono);
    margin-bottom: var(--space-xs);
}

.stat-card-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ---------- Documentation ---------- */
.docs-container {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: var(--space-lg);
    align-items: start;
}

.docs-sidebar {
    position: sticky;
    top: 80px;
    padding: var(--space-md);
}

.docs-nav {
    list-style: none;
}

.docs-nav li {
    margin-bottom: var(--space-xs);
}

.docs-link {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: color var(--transition-fast), background var(--transition-fast);
    border-left: 2px solid transparent;
}

.docs-link:hover,
.docs-link.active {
    color: var(--accent-blue-light);
    background: rgba(59, 130, 246, 0.08);
    border-left-color: var(--accent-blue);
}

.docs-content {
    padding: var(--space-xl);
}

.docs-content article {
    margin-bottom: var(--space-2xl);
    padding-bottom: var(--space-2xl);
    border-bottom: 1px solid var(--border-subtle);
}

.docs-content article:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.docs-content h3 {
    color: var(--accent-blue-light);
    margin-bottom: var(--space-md);
    font-size: 1.3rem;
}

.docs-content p {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.8;
}

.docs-content ul {
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    padding-left: var(--space-lg);
    line-height: 1.8;
}

.docs-content li {
    margin-bottom: var(--space-sm);
}

.docs-content strong {
    color: var(--text-primary);
}

.docs-content em {
    color: var(--accent-blue-light);
    font-style: italic;
}

.doc-code-block {
    background: #0d1117;
    border-radius: var(--radius-md);
    overflow-x: auto;
    border: 1px solid var(--border-subtle);
    margin-bottom: var(--space-md);
}

.doc-code-block pre {
    padding: var(--space-lg);
    margin: 0;
}

.doc-code-block code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

/* ---------- Analytics & Visualizations ---------- */
.section-subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: -20px;
    margin-bottom: var(--space-xl);
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
}

.chart-card {
    display: flex;
    flex-direction: column;
}

.chart-card-wide {
    grid-column: 1 / -1;
}

.chart-title {
    font-size: 1.05rem;
    color: var(--accent-blue-light);
    margin-bottom: var(--space-xs);
}

.chart-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--space-md);
}

.chart-container {
    position: relative;
    width: 100%;
    min-height: 280px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.chart-container canvas {
    max-height: 320px;
}

.chart-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-style: italic;
    background: rgba(0, 0, 0, 0.15);
    border-radius: var(--radius-md);
}

.chart-placeholder.hidden {
    display: none;
}

/* Heatmap */
.heatmap-container {
    position: relative;
    min-height: 180px;
}

.heatmap-grid {
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.heatmap-header {
    display: flex;
    gap: 3px;
    margin-bottom: var(--space-xs);
}

.heatmap-header-cell {
    flex: 1;
    text-align: center;
    font-size: 0.65rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
    padding: 4px 2px;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.heatmap-header-cell.row-label {
    flex: 0 0 50px;
    text-align: right;
    padding-right: 8px;
}

.heatmap-row {
    display: flex;
    gap: 3px;
}

.heatmap-row-label {
    flex: 0 0 50px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: 8px;
    font-size: 0.65rem;
    font-family: var(--font-mono);
    color: var(--text-muted);
}

.heatmap-cell {
    flex: 1;
    aspect-ratio: 1;
    min-width: 0;
    max-height: 36px;
    border-radius: 3px;
    transition: transform var(--transition-fast);
    cursor: default;
    position: relative;
}

.heatmap-cell:hover {
    transform: scale(1.2);
    z-index: 1;
}

.heatmap-cell.quality-good {
    background: var(--accent-green);
    opacity: 0.8;
}

.heatmap-cell.quality-warn {
    background: var(--accent-yellow);
    opacity: 0.8;
}

.heatmap-cell.quality-error {
    background: var(--accent-red);
    opacity: 0.8;
}

.heatmap-cell.quality-na {
    background: var(--border-subtle);
    opacity: 0.3;
}

.heatmap-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-lg);
    margin-top: var(--space-md);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.heatmap-legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.heatmap-legend-swatch {
    width: 14px;
    height: 14px;
    border-radius: 3px;
}

/* Heatmap tooltip */
.heatmap-cell[title] {
    cursor: help;
}

/* ---------- About Modal ---------- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    max-width: 640px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    border-radius: var(--radius-lg);
    padding: 0;
    transform: translateY(20px) scale(0.97);
    transition: transform var(--transition-normal);
}

.modal-overlay.active .modal-container {
    transform: translateY(0) scale(1);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg) var(--space-xl);
    border-bottom: 1px solid var(--border-subtle);
}

.modal-header h2 {
    font-size: 1.4rem;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
    padding: var(--space-xs);
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
}

.modal-close:hover {
    color: var(--text-primary);
    background: rgba(148, 163, 184, 0.1);
}

.modal-body {
    padding: var(--space-lg) var(--space-xl) var(--space-xl);
}

.modal-section {
    margin-bottom: var(--space-lg);
}

.modal-section:last-child {
    margin-bottom: 0;
}

.modal-section h3 {
    font-size: 1.05rem;
    color: var(--accent-blue-light);
    margin-bottom: var(--space-sm);
}

.modal-section p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 0.95rem;
}

.modal-disclaimer {
    background: rgba(59, 130, 246, 0.06);
    border: 1px solid var(--border-active);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
}

.modal-disclaimer h3 {
    color: var(--accent-yellow);
}

@media (max-width: 600px) {
    .modal-container {
        width: 95%;
        max-height: 90vh;
    }

    .modal-header,
    .modal-body {
        padding: var(--space-md);
    }
}

/* ---------- Footer ---------- */
.site-footer {
    text-align: center;
    padding: var(--space-2xl) var(--space-xl);
    border-top: 1px solid var(--border-subtle);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-tech {
    margin-top: var(--space-sm);
    font-size: 0.75rem;
    color: var(--text-muted);
    opacity: 0.6;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
    .controls-row {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .pipeline-flow {
        flex-wrap: wrap;
        gap: var(--space-md);
        justify-content: center;
    }

    .pipeline-connector {
        display: none;
    }

    .pipeline-stage {
        min-width: 100px;
    }

    .data-preview-container {
        grid-template-columns: 1fr;
    }

    .docs-container {
        grid-template-columns: 1fr;
    }

    .docs-sidebar {
        position: static;
        overflow-x: auto;
    }

    .docs-nav {
        display: flex;
        gap: var(--space-sm);
        padding-bottom: var(--space-sm);
    }

    .docs-nav li {
        margin-bottom: 0;
    }

    .docs-link {
        white-space: nowrap;
        border-left: none;
        border-bottom: 2px solid transparent;
        padding: var(--space-sm) var(--space-md);
    }

    .docs-link:hover,
    .docs-link.active {
        border-left: none;
        border-bottom-color: var(--accent-blue);
    }

    .header-subtitle {
        display: none;
    }

    .charts-grid {
        grid-template-columns: 1fr;
    }

    .chart-card-wide {
        grid-column: auto;
    }

    .output-toolbar {
        flex-direction: column;
        gap: var(--space-md);
    }

    .stats-bar {
        gap: var(--space-lg);
    }
}

@media (max-width: 600px) {
    .section {
        padding: var(--space-xl) var(--space-md);
    }

    .header-nav {
        display: none;
    }

    .hero-text h2 {
        font-size: 1.6rem;
    }

    .hero-text p {
        font-size: 0.95rem;
    }

    .controls-panel {
        padding: var(--space-md);
    }

    .controls-actions {
        flex-direction: column;
    }

    .stats-bar {
        flex-wrap: wrap;
        gap: var(--space-md);
    }

    .stat-item {
        flex: 1 0 40%;
    }

    .pipeline-flow {
        flex-direction: column;
        align-items: center;
    }

    .terminal-title {
        display: none;
    }

    .terminal-body {
        font-size: 0.7rem;
        min-height: 200px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .export-buttons {
        width: 100%;
    }

    .btn-export {
        flex: 1;
    }
}