/* OSRTIME Knowledge Center CSS */
:root {
    --page-bg: #0C0D0F;
    --surface-1: #141517;
    --surface-2: #1A1C1F;
    --surface-3: #222428;
    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.10);
    --text-primary: #E8EAED;
    --text-secondary: #9AA0A6;
    --text-muted: #5F6368;
    --accent-cool: #80CBC4;
    --accent-blue: #81D4FA;
    --accent-green: #69F0AE;
    --accent-red: #FF5252;
    --accent-purple: #B39DDB;
    --accent-orange: #FFB74D;
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    background: var(--page-bg);
    color: var(--text-primary);
    font-family: 'Inter', system-ui, sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.page-wrapper {
    max-width: 1000px;
    margin: 0 auto;
    padding: 48px 24px;
}

/* Header */
.kc-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 64px;
    animation: fadeIn 0.8s ease-out both;
}
.kc-badge {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 100px;
    padding: 6px 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    letter-spacing: 2.5px;
    color: var(--accent-cool);
}

/* Hero */
.hero-section {
    text-align: center;
    margin-bottom: 80px;
    animation: fadeIn 0.8s ease-out 0.2s both;
}
.hero-title {
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 700;
    letter-spacing: -0.5px;
    line-height: 1.1;
    margin-bottom: 24px;
}
.hero-title span {
    color: var(--accent-cool);
    font-weight: 400;
}
.hero-tc-display {
    font-family: 'JetBrains Mono', monospace;
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 700;
    letter-spacing: 2px;
    color: #fff;
    text-shadow: 0 0 40px rgba(128, 203, 196, 0.2);
    margin-bottom: 24px;
}
.hero-sub {
    font-size: clamp(14px, 2vw, 18px);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Glossary Bar */
.glossary-bar {
    position: sticky;
    top: 16px;
    z-index: 100;
    background: rgba(20, 21, 23, 0.85);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 64px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    animation: fadeIn 0.8s ease-out 0.4s both;
}
.glossary-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.gl-term {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--accent-cool);
}
.gl-def {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Navigation */
.kc-nav {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 64px;
    animation: fadeIn 0.8s ease-out 0.3s both;
}
.kc-nav-item {
    padding: 14px 32px;
    min-height: 44px;
    display: flex;
    align-items: center;
    border-radius: 100px;
    text-decoration: none;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 2px;
    color: var(--text-secondary);
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    transition: all 0.3s ease;
}
.kc-nav-item:hover {
    background: var(--surface-2);
    color: var(--text-primary);
}
.kc-nav-item.active {
    background: var(--accent-cool);
    color: #000;
    border-color: var(--accent-cool);
}

/* Sections */
.kc-section {
    display: none;
    animation: fadeIn 0.5s ease-out both;
}
.kc-section.active {
    display: block;
}

/* Shared Module Styles */
.module-block {
    background: var(--surface-1);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 48px;
}
.module-title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 16px;
    color: #fff;
}
.module-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 32px;
    max-width: 700px;
}

/* Show the math accordion */
.math-accordion {
    margin-top: 24px;
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    overflow: hidden;
}
.math-toggle {
    width: 100%;
    background: var(--surface-2);
    border: none;
    padding: 12px 20px;
    min-height: 44px;
    align-items: center;
    text-align: left;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: var(--accent-cool);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
}
.math-content {
    display: none;
    padding: 20px;
    background: var(--page-bg);
    border-top: 1px solid var(--border-medium);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}
.math-accordion.open .math-content {
    display: block;
}

/* Calculator */
.calc-container { margin-top: 32px; }
.calc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}
.calc-col {
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.calc-col label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}
.calc-input {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    padding: 12px 16px;
    color: #fff;
    font-family: 'Inter', sans-serif;
    font-size: 16px;
    transition: border-color 0.2s;
}
.calc-input:focus {
    outline: none;
    border-color: var(--accent-cool);
}
.tc-font {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    letter-spacing: 1px;
}
.calc-perspectives {
    display: flex;
    gap: 16px;
}
.perspective-box {
    flex: 1;
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 24px;
}
.persp-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-green);
    margin-bottom: 4px;
}
.persp-desc {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 16px;
}
/* Visuals (Learn Section) */
.tc-interactive-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}
.tc-segments {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: clamp(20px, 5vw, 64px);
    font-weight: 700;
}
.tc-segment {
    background: var(--surface-2);
    padding: 12px 10px;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    border: 2px solid transparent;
}
.tc-segment:hover, .tc-segment.active {
    border-color: var(--accent-cool);
    color: var(--accent-cool);
}
.tc-colon {
    color: var(--text-muted);
}
.tc-segment-info {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 24px;
    width: 100%;
    max-width: 500px;
    text-align: center;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    line-height: 1.5;
}

/* Layer Viz */
.layer-viz {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: 32px;
    overflow-x: auto;
    padding-bottom: 16px;
    width: 100%;
}
.layer-row {
    display: flex;
    align-items: center;
    gap: 24px;
    min-width: 600px;
}
.layer-label {
    width: 140px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: right;
    flex-shrink: 0;
}
.layer-boxes {
    display: flex;
    gap: 12px;
    flex: 1;
}
.l-box, .f-box {
    flex: 1;
    padding: 16px 8px;
    text-align: center;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 600;
}
.l-box {
    background: rgba(128, 203, 196, 0.1);
    border: 1px solid var(--accent-cool);
    color: var(--accent-cool);
}
.l-box.skip {
    background: rgba(255, 82, 82, 0.1);
    border: 1px dashed var(--accent-red);
    color: var(--accent-red);
    opacity: 0.7;
}
.f-box {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    color: var(--text-primary);
}
.f-box.solid {
    background: rgba(255, 255, 255, 0.05);
}

/* Chart */
.xy-chart {
    background: var(--surface-2);
    border-radius: 12px;
    padding: 24px;
    margin-top: 24px;
}
.drift-svg {
    width: 100%;
    height: auto;
}

/* Drift Steps */
.drift-steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 24px;
}
.drift-step {
    display: flex;
    justify-content: space-between;
    background: var(--surface-2);
    padding: 16px 24px;
    border-radius: 8px;
    font-family: 'JetBrains Mono', monospace;
}
.drift-step .tc { color: var(--accent-cool); }
.drift-step .rt { color: var(--accent-red); }

/* DF Grid */
.df-grid-container {
    margin-top: 32px;
}
.df-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    margin-bottom: 24px;
}
.df-min {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    padding: 16px 8px;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}
.df-min:hover {
    background: var(--surface-3);
    border-color: var(--accent-cool);
}
.df-min.active {
    background: var(--accent-cool);
    color: #000;
    border-color: var(--accent-cool);
}
.df-min span {
    font-size: 11px;
    font-weight: 400;
    opacity: 0.7;
}
.df-grid-result {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
    line-height: 1.6;
}

/* Compare Viz */
.compare-viz {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    margin-top: 32px;
    overflow-x: auto;
    padding-bottom: 16px;
    width: 100%;
}
.comp-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 140px;
}
.comp-title {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 8px;
}
.strong-statement {
    font-size: 18px;
    font-weight: 700;
    text-align: center;
    color: var(--accent-cool);
    margin-top: 32px;
}

.persp-val {
    font-family: 'JetBrains Mono', monospace;
    font-size: 20px;
    font-weight: 700;
    color: #fff;
}

/* Reference Cards */
.reference-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}
.ref-card {
    background: var(--surface-2);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 24px;
    transition: transform 0.2s ease, border-color 0.2s ease;
}
.ref-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-cool);
}
.ref-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}
.ref-text {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .glossary-bar {
        flex-direction: row;
        overflow-x: auto;
        padding: 12px;
        border-radius: 0;
        margin-left: -24px;
        margin-right: -24px;
        margin-bottom: 40px;
        border-left: none;
        border-right: none;
        width: 100vw;
        max-width: 100vw;
    }
    .glossary-item {
        min-width: 140px;
        flex-shrink: 0;
    }
    .kc-nav {
        flex-direction: column;
    }
    .module-block {
        padding: 24px;
    }
}


/* %% KNOWLEDGE PRODUCT MODULE %% */
.product-section {
    background: linear-gradient(135deg, var(--surface-1) 0%, var(--surface-2) 100%);
    border: 1px solid var(--border-medium);
    border-radius: 12px;
    padding: 48px;
    display: flex;
    align-items: center;
    gap: 48px;
    margin-top: 64px;
    margin-bottom: 64px;
}
.product-copy {
    flex: 1;
}
.product-eyebrow {
    font-family: "JetBrains Mono", monospace;
    font-size: 11px;
    font-weight: 700;
    color: var(--accent-cool);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 12px;
}
.product-headline {
    font-size: 32px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.2;
}
.product-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.5;
}
.product-ctas {
    display: flex;
    gap: 16px;
}
.product-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    padding: 12px 24px;
    border-radius: 8px;
    transition: all 0.2s ease;
}
.product-cta.primary {
    background: var(--surface-2);
    border: 1px solid var(--accent-cool);
    color: var(--accent-cool);
}
.product-cta.primary:hover {
    background: rgba(128, 203, 196, 0.1);
}
.product-cta.secondary {
    background: transparent;
    border: 1px solid var(--border-medium);
    color: var(--text-primary);
}
.product-cta.secondary:hover {
    background: var(--surface-3);
    border-color: var(--text-secondary);
}
.product-visual {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}
.product-mockup {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    border: 1px solid var(--border-subtle);
}
@media (max-width: 900px) {
    .product-section {
        flex-direction: column;
        padding: 32px 24px;
        gap: 32px;
        text-align: center;
    }
    .product-ctas {
        justify-content: center;
    }
}
@media (max-width: 600px) {
    .product-ctas {
        flex-direction: column;
    }
}