/* ========== Base Theme Overrides ========== */
:root {
    --accent: #4fc3f7;
    --accent2: #ab47bc;
    --accent3: #66bb6a;
    --bg-dark: #1a1a2e;
    --bg-card: rgba(255,255,255,0.06);
    --border: rgba(255,255,255,0.12);
    --text-muted: rgba(255,255,255,0.6);
}

.reveal {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

.reveal h1, .reveal h2, .reveal h3 {
    font-weight: 700;
    text-transform: none;
    letter-spacing: -0.02em;
}

.reveal pre {
    width: 100%;
    font-size: 0.52em;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.reveal code {
    font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* ========== Gradient Text ========== */
.gradient-text {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ========== Title Slide ========== */
.subtitle {
    font-size: 0.7em !important;
    color: var(--text-muted);
    margin-top: 0.5em;
}

.meta-info {
    display: flex;
    gap: 1em;
    justify-content: center;
    margin-top: 1.5em;
    font-size: 0.5em;
    color: var(--text-muted);
}

.meta-info span {
    background: var(--bg-card);
    padding: 0.4em 0.8em;
    border-radius: 20px;
    border: 1px solid var(--border);
}

.nav-hint {
    font-size: 0.4em !important;
    color: rgba(255,255,255,0.35);
    margin-top: 2em;
}

.nav-hint kbd {
    background: rgba(255,255,255,0.1);
    padding: 0.15em 0.5em;
    border-radius: 4px;
    border: 1px solid rgba(255,255,255,0.2);
    font-family: monospace;
}

/* ========== Roadmap ========== */
.roadmap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    margin-top: 1.5em;
    flex-wrap: wrap;
}

.roadmap-item {
    text-align: center;
    padding: 1em;
    background: var(--bg-card);
    border-radius: 12px;
    border: 2px solid var(--border);
    transition: all 0.3s ease;
    min-width: 100px;
}

.roadmap-item.active {
    border-color: var(--accent);
    background: rgba(79, 195, 247, 0.1);
    transform: scale(1.05);
}

.roadmap-icon { font-size: 1.5em; margin-bottom: 0.3em; }
.roadmap-label { font-size: 0.5em; }
.roadmap-arrow { font-size: 1.2em; color: var(--text-muted); }

/* ========== Section Titles ========== */
.section-title {
    font-size: 0.6em !important;
    color: var(--accent) !important;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 0 !important;
}

/* ========== Two Column Layout ========== */
.two-col {
    display: flex;
    gap: 1.5em;
    align-items: flex-start;
}

.two-col .col { flex: 1; }

/* ========== Explain Box ========== */
.explain-box {
    background: rgba(79, 195, 247, 0.08);
    border-left: 3px solid var(--accent);
    padding: 0.6em 1em;
    margin-top: 0.8em;
    border-radius: 0 8px 8px 0;
    font-size: 0.5em;
    text-align: left;
}

.explain-box.small { font-size: 0.45em; }
.explain-box p { margin: 0.3em 0; }

/* ========== Text Sample Box ========== */
.text-sample {
    background: #0d1117;
    border-radius: 8px;
    overflow: hidden;
    font-size: 0.45em;
    text-align: left;
}

.text-sample-header {
    background: rgba(255,255,255,0.08);
    padding: 0.4em 0.8em;
    font-size: 0.85em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.text-sample-body {
    padding: 0.8em;
    font-family: monospace;
    white-space: pre-wrap;
    color: rgba(255,255,255,0.8);
    max-height: 150px;
    overflow-y: auto;
}

/* ========== Stats ========== */
.stat-row {
    display: flex;
    gap: 1em;
    margin-top: 0.8em;
    justify-content: center;
}

.stat {
    background: var(--bg-card);
    padding: 0.5em 1em;
    border-radius: 8px;
    border: 1px solid var(--border);
    text-align: center;
}

.stat-num {
    display: block;
    font-size: 0.8em;
    font-weight: 700;
    color: var(--accent);
}

.stat-label {
    font-size: 0.4em;
    color: var(--text-muted);
}

/* ========== Split Visual ========== */
.split-visual { margin-top: 1em; }

.split-bar {
    display: flex;
    height: 40px;
    border-radius: 8px;
    overflow: hidden;
    font-size: 0.5em;
}

.split-train {
    background: linear-gradient(135deg, #4fc3f7, #29b6f6);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.split-val {
    background: linear-gradient(135deg, #ab47bc, #8e24aa);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.split-note {
    font-size: 0.4em;
    color: var(--text-muted);
    margin-top: 0.5em;
}

/* ========== Interactive Tokenizer Demo ========== */
.interactive-demo {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1em;
    margin-top: 0.8em;
}

.interactive-demo label {
    font-size: 0.5em;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.5em;
}

#tokenizer-input {
    width: 100%;
    padding: 0.5em;
    font-size: 0.6em;
    font-family: monospace;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: white;
    outline: none;
    transition: border-color 0.2s;
}

#tokenizer-input:focus { border-color: var(--accent); }

.token-display {
    margin-top: 0.5em;
    display: flex;
    gap: 0.3em;
    flex-wrap: wrap;
    min-height: 2em;
}

.token-chip {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background: rgba(79, 195, 247, 0.15);
    border: 1px solid rgba(79, 195, 247, 0.3);
    border-radius: 6px;
    padding: 0.3em 0.5em;
    font-size: 0.5em;
    transition: transform 0.2s;
}

.token-chip:hover { transform: scale(1.1); }
.token-char { font-weight: 700; font-size: 1.2em; }
.token-id { font-size: 0.8em; color: var(--accent); }

/* ========== Param Grid ========== */
.param-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.8em;
    margin-top: 1em;
}

.param-card {
    perspective: 600px;
    height: 80px;
    cursor: pointer;
}

.param-card .param-front,
.param-card .param-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    padding: 0.5em;
    font-size: 0.45em;
    transition: transform 0.5s;
    text-align: center;
}

.param-front {
    background: var(--bg-card);
    border: 1px solid var(--border);
}

.param-back {
    background: rgba(79, 195, 247, 0.15);
    border: 1px solid var(--accent);
    transform: rotateY(180deg);
}

.param-card.flipped .param-front { transform: rotateY(180deg); }
.param-card.flipped .param-back { transform: rotateY(0deg); }

/* ========== Batch Visual ========== */
.batch-visual { margin-top: 0.5em; }

.batch-explanation {
    font-size: 0.5em;
    margin-bottom: 0.8em;
}

.batch-example {
    background: var(--bg-card);
    border-radius: 8px;
    padding: 1em;
    display: inline-block;
}

.batch-row {
    display: flex;
    align-items: center;
    gap: 0.3em;
    margin: 0.3em 0;
}

.batch-label {
    font-family: monospace;
    font-size: 0.55em;
    width: 2.5em;
    text-align: right;
    color: var(--text-muted);
}

.batch-cell {
    width: 2.2em;
    height: 2.2em;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: monospace;
    font-size: 0.55em;
    border-radius: 4px;
    background: rgba(255,255,255,0.06);
    border: 1px solid var(--border);
    transition: all 0.3s;
}

.batch-cell.highlight {
    background: rgba(79, 195, 247, 0.2);
    border-color: var(--accent);
    color: var(--accent);
}

.batch-cell.active {
    background: rgba(171, 71, 188, 0.3);
    border-color: var(--accent2);
    transform: scale(1.15);
}

.demo-btn {
    margin-top: 0.8em;
    padding: 0.4em 1.2em;
    font-size: 0.5em;
    background: rgba(79, 195, 247, 0.15);
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}

.demo-btn:hover {
    background: rgba(79, 195, 247, 0.3);
    transform: translateY(-1px);
}

/* ========== Attention Walkthrough ========== */
.attention-walkthrough { font-size: 0.9em; }

.step-controls {
    display: flex;
    gap: 0.3em;
    justify-content: center;
    margin-bottom: 0.8em;
}

.step-btn {
    padding: 0.3em 0.8em;
    font-size: 0.45em;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
}

.step-btn.active {
    background: rgba(79, 195, 247, 0.2);
    border-color: var(--accent);
    color: var(--accent);
}

.step-panel {
    display: none;
    text-align: center;
}

.step-panel.visible { display: block; }

.step-desc {
    font-size: 0.48em;
    color: var(--text-muted);
    margin-top: 0.6em;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* Matrix styles */
.matrix-visual {
    display: flex;
    justify-content: center;
    gap: 1em;
}

.matrix { text-align: center; }

.matrix-title {
    font-size: 0.5em;
    color: var(--accent);
    margin-bottom: 0.5em;
    font-weight: 600;
}

.matrix-table {
    border-collapse: collapse;
    margin: 0 auto;
}

.matrix-table td {
    width: 3.5em;
    height: 2.2em;
    text-align: center;
    font-family: monospace;
    font-size: 0.45em;
    border: 1px solid var(--border);
    background: var(--bg-card);
    transition: all 0.3s;
}

.matrix-table td.masked {
    background: rgba(244, 67, 54, 0.15);
    color: #ef5350;
    font-weight: 700;
}

.matrix-table td.hot { background: rgba(79, 195, 247, 0.35); color: #4fc3f7; font-weight: 700; }
.matrix-table td.warm { background: rgba(79, 195, 247, 0.2); }
.matrix-table td.mild { background: rgba(79, 195, 247, 0.1); }
.matrix-table td.cold { background: rgba(255,255,255,0.02); color: rgba(255,255,255,0.3); }

/* Matmul diagram */
.matmul-diagram {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5em;
    margin-top: 0.5em;
}

.mm-box {
    padding: 0.8em 1em;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 0.45em;
    line-height: 1.4;
}

.mm-box.result {
    border-color: var(--accent);
    background: rgba(79, 195, 247, 0.1);
}

.mm-op {
    font-size: 0.7em;
    color: var(--text-muted);
}

/* ========== Mask Demo ========== */
.mask-demo { text-align: center; }
.mask-demo > p { font-size: 0.5em; color: var(--text-muted); }

.mask-grid {
    display: inline-grid;
    gap: 2px;
    margin: 0.5em auto;
}

.mask-cell {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.4em;
    font-family: monospace;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
}

.mask-cell.allowed {
    background: rgba(79, 195, 247, 0.2);
    border: 1px solid rgba(79, 195, 247, 0.4);
}

.mask-cell.blocked {
    background: rgba(244, 67, 54, 0.1);
    border: 1px solid rgba(244, 67, 54, 0.2);
    color: rgba(255,255,255,0.2);
}

.mask-cell.highlight-row {
    transform: scale(1.1);
    box-shadow: 0 0 8px rgba(79, 195, 247, 0.5);
}

.mask-explanation {
    font-size: 0.45em;
    color: var(--text-muted);
    margin-top: 0.5em;
}

/* ========== SVG Diagrams ========== */
.diagram {
    width: 100%;
    max-width: 700px;
    margin: 0 auto;
    display: block;
}

.diagram.large { max-width: 800px; }

.token-box { fill: rgba(79, 195, 247, 0.15); stroke: rgba(79, 195, 247, 0.4); stroke-width: 1.5; }
.token-box.current-token { fill: rgba(79, 195, 247, 0.3); stroke: var(--accent); stroke-width: 2; }
.token-text { fill: white; text-anchor: middle; font-size: 14px; font-family: monospace; }
.attn-line { stroke: var(--accent); }
.diagram-title { fill: white; text-anchor: middle; font-size: 14px; font-weight: 600; }
.diagram-subtitle { fill: rgba(255,255,255,0.5); text-anchor: middle; font-size: 11px; }
.weight-text { fill: var(--accent); text-anchor: middle; font-size: 11px; font-family: monospace; }

.box-text { fill: white; text-anchor: middle; font-size: 11px; font-weight: 600; }
.box-text-sub { fill: var(--accent); text-anchor: middle; font-size: 20px; font-weight: 700; }
.box-text-detail { fill: rgba(255,255,255,0.5); text-anchor: middle; font-size: 9px; }
.head-text { fill: white; text-anchor: middle; font-size: 9px; }
.flow-line { stroke: rgba(255,255,255,0.4); stroke-width: 1.5; fill: none; }
.residual-line { stroke: var(--accent3); stroke-width: 1.5; stroke-dasharray: 5,3; fill: none; }
.residual-label { fill: var(--accent3); font-size: 10px; text-anchor: middle; }
.add-text { fill: white; text-anchor: middle; font-size: 16px; font-weight: 700; }
.add-circle { fill: rgba(102, 187, 106, 0.2); stroke: var(--accent3); stroke-width: 1.5; }

.input-box { fill: rgba(79, 195, 247, 0.1); stroke: rgba(79, 195, 247, 0.4); stroke-width: 1; }
.emb-box { fill: rgba(171, 71, 188, 0.15); stroke: rgba(171, 71, 188, 0.4); stroke-width: 1; }
.norm-box { fill: rgba(255, 183, 77, 0.15); stroke: rgba(255, 183, 77, 0.4); stroke-width: 1; }
.attn-box { fill: rgba(79, 195, 247, 0.15); stroke: rgba(79, 195, 247, 0.4); stroke-width: 1; }
.ffn-box { fill: rgba(102, 187, 106, 0.15); stroke: rgba(102, 187, 106, 0.4); stroke-width: 1; }
.concat-box { fill: rgba(255, 183, 77, 0.15); stroke: rgba(255, 183, 77, 0.4); stroke-width: 1; }
.proj-box { fill: rgba(171, 71, 188, 0.15); stroke: rgba(171, 71, 188, 0.4); stroke-width: 1; }
.output-box { fill: rgba(102, 187, 106, 0.15); stroke: rgba(102, 187, 106, 0.4); stroke-width: 1; }
.expand-box { fill: rgba(255, 183, 77, 0.15); stroke: rgba(255, 183, 77, 0.4); stroke-width: 1; }
.relu-box { fill: rgba(244, 67, 54, 0.15); stroke: rgba(244, 67, 54, 0.4); stroke-width: 1; }
.blocks-box { fill: rgba(79, 195, 247, 0.08); stroke: rgba(79, 195, 247, 0.3); stroke-width: 2; stroke-dasharray: 8,4; }
.lmhead-box { fill: rgba(255, 183, 77, 0.15); stroke: rgba(255, 183, 77, 0.4); stroke-width: 1; }
.stats-box { fill: rgba(255,255,255,0.04); stroke: var(--border); stroke-width: 1; }
.stats-title { fill: var(--accent); text-anchor: middle; font-size: 12px; font-weight: 600; }
.stats-text { fill: rgba(255,255,255,0.7); text-anchor: middle; font-size: 11px; }

.head-box { stroke-width: 1; }
.h1 { fill: rgba(79, 195, 247, 0.2); stroke: rgba(79, 195, 247, 0.5); }
.h2 { fill: rgba(171, 71, 188, 0.2); stroke: rgba(171, 71, 188, 0.5); }
.h3 { fill: rgba(102, 187, 106, 0.2); stroke: rgba(102, 187, 106, 0.5); }

/* ========== Highlighted spans ========== */
.hl-q { color: #ff7043; font-weight: 600; }
.hl-k { color: #4fc3f7; font-weight: 600; }
.hl-v { color: #66bb6a; font-weight: 600; }

/* ========== Generation Visual ========== */
.generation-visual {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1em;
    margin-top: 0.5em;
}

.gen-step {
    display: flex;
    align-items: center;
    gap: 0.5em;
    margin: 0.4em 0;
}

.gen-label {
    font-size: 0.45em;
    color: var(--text-muted);
    min-width: 4em;
    text-align: right;
}

.gen-tokens {
    font-family: monospace;
    font-size: 0.55em;
    color: var(--accent);
}

.gen-output {
    font-family: monospace;
    font-size: 0.55em;
    color: var(--accent3);
}

.prob-bars {
    display: flex;
    gap: 2px;
    align-items: flex-end;
    height: 30px;
}

.prob-bar {
    width: 14px;
    background: var(--accent);
    border-radius: 2px 2px 0 0;
    transition: height 0.3s;
    position: relative;
}

.prob-bar-label {
    position: absolute;
    bottom: -14px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 8px;
    font-family: monospace;
    color: var(--text-muted);
}

/* ========== Loss Chart ========== */
.loss-chart-container {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1em;
    max-width: 700px;
    margin: 0 auto;
}

/* ========== Output Sample ========== */
.output-sample {
    background: #0d1117;
    border-radius: 8px;
    overflow: hidden;
    max-width: 600px;
    margin: 0.5em auto;
    text-align: left;
}

.output-header {
    background: rgba(255,255,255,0.06);
    padding: 0.4em 0.8em;
    font-size: 0.45em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.output-body {
    padding: 0.8em;
    font-family: monospace;
    font-size: 0.42em;
    color: rgba(255,255,255,0.85);
    white-space: pre-wrap;
    line-height: 1.5;
    min-height: 120px;
}

/* ========== Summary ========== */
.summary-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.8em;
    margin-top: 1em;
}

.summary-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 0.8em;
    text-align: left;
}

.summary-card h4 {
    font-size: 0.5em;
    color: var(--accent);
    margin: 0 0 0.5em 0;
}

.summary-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
    font-size: 0.4em;
}

.summary-card li {
    padding: 0.2em 0;
    padding-left: 1em;
    position: relative;
}

.summary-card li::before {
    content: '›';
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* ========== Comparison Table ========== */
.comparison-table {
    margin-top: 1em;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.48em;
}

.comparison-table th, .comparison-table td {
    padding: 0.5em 0.8em;
    border: 1px solid var(--border);
    text-align: center;
}

.comparison-table th {
    background: rgba(79, 195, 247, 0.1);
    color: var(--accent);
    font-weight: 600;
}

.comparison-table td:first-child {
    text-align: left;
    font-weight: 600;
    color: var(--text-muted);
}

.comparison-table td:nth-child(2) {
    background: rgba(79, 195, 247, 0.08);
    color: var(--accent);
}

.table-note {
    font-size: 0.38em;
    color: rgba(255,255,255,0.4);
    margin-top: 0.6em;
}

/* ========== Takeaways ========== */
.takeaways {
    display: flex;
    flex-direction: column;
    gap: 0.6em;
    margin-top: 0.8em;
}

.takeaway {
    display: flex;
    gap: 0.8em;
    align-items: flex-start;
    background: var(--bg-card);
    border-radius: 10px;
    padding: 0.6em 1em;
    text-align: left;
}

.takeaway-num {
    flex-shrink: 0;
    width: 1.8em;
    height: 1.8em;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.55em;
}

.takeaway p {
    font-size: 0.45em;
    margin: 0;
    line-height: 1.5;
}

/* ========== Credits ========== */
.credits {
    margin-top: 1.5em;
    font-size: 0.4em;
    color: var(--text-muted);
}

.credits a {
    color: var(--accent);
    text-decoration: underline;
}

/* ========== Multi-head visual ========== */
.multihead-visual {
    margin: 0.5em 0;
}

/* ========== Animations ========== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.reveal .slides section .fragment.fade-in-up {
    opacity: 0;
    transform: translateY(20px);
}

.reveal .slides section .fragment.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
    transition: all 0.5s ease;
}

/* ========== Responsive ========== */
@media (max-width: 800px) {
    .two-col { flex-direction: column; }
    .summary-grid { grid-template-columns: repeat(2, 1fr); }
    .param-grid { grid-template-columns: repeat(2, 1fr); }
}