/* ==========================================
   DIFFUSION TAB STYLES - Dark Luxe Edition
   Pink accent: #ec4899 (Creative/Generative)
   ========================================== */

/* ==========================================
   PANEL ACCENT SCOPING
   ========================================== */

#diffusion-panel {
    --accent: var(--accent-diffusion);
    --accent-glow: var(--accent-diffusion-glow);
    --accent-soft: var(--accent-diffusion-soft);
}

/* ==========================================
   CONTROLS BAR
   ========================================== */

.diffusion-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1.25rem;
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.08) 0%,
        var(--bg-card) 50%,
        rgba(236, 72, 153, 0.05) 100%);
    border-bottom: 1px solid rgba(236, 72, 153, 0.15);
    position: relative;
}

.diffusion-controls::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg,
        transparent,
        rgba(236, 72, 153, 0.4) 20%,
        rgba(244, 114, 182, 0.6) 50%,
        rgba(236, 72, 153, 0.4) 80%,
        transparent);
}

/* Backend Status Indicator */
.diffusion-controls .backend-status {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-warning);
    transition: all 0.3s ease;
    position: relative;
}

.diffusion-controls .backend-status.active {
    background: var(--color-success);
    box-shadow:
        0 0 8px var(--color-success),
        0 0 20px rgba(16, 185, 129, 0.4);
}

.diffusion-controls .backend-status::after {
    content: '';
    position: absolute;
    inset: -3px;
    border-radius: 50%;
    border: 1px solid currentColor;
    opacity: 0.3;
}

/* ==========================================
   MAIN LAYOUT
   ========================================== */

.diffusion-main {
    display: grid;
    grid-template-columns: 280px 1fr 260px;
    gap: 1.25rem;
    padding: 1.25rem;
    height: calc(100vh - 180px);
    overflow: hidden;
    background: linear-gradient(180deg,
        var(--bg-deep) 0%,
        var(--bg-void) 100%);
}

/* ==========================================
   LEFT SIDEBAR
   ========================================== */

.diffusion-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    padding-right: 0.5rem;
}

.diffusion-sidebar::-webkit-scrollbar {
    width: 4px;
}

.diffusion-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.diffusion-sidebar::-webkit-scrollbar-thumb {
    background: rgba(236, 72, 153, 0.3);
    border-radius: 2px;
}

/* Model Info Section */
.diffusion-model-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.diffusion-model-info .model-info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 0.75rem;
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.1);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.diffusion-model-info .model-info-item:hover {
    border-color: rgba(236, 72, 153, 0.25);
    background: rgba(236, 72, 153, 0.05);
}

.diffusion-model-info .model-info-label {
    color: var(--text-muted);
    font-size: 0.75rem;
    font-family: var(--font-ui);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.diffusion-model-info .model-info-value {
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
}

/* Mini Architecture Diagram */
.diffusion-arch-mini {
    margin: 0.5rem 0;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.diffusion-arch-mini::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(236, 72, 153, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 70%, rgba(244, 114, 182, 0.06) 0%, transparent 50%);
    pointer-events: none;
}

.diffusion-arch-mini canvas {
    width: 100%;
    height: auto;
    border-radius: 8px;
    position: relative;
    z-index: 1;
}

/* Training Toggle */
.diffusion-train-toggle {
    margin: 0.5rem 0;
    padding: 0.875rem 1rem;
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.12) 0%,
        rgba(236, 72, 153, 0.06) 100%);
    border: 1px solid rgba(236, 72, 153, 0.25);
    border-radius: 10px;
    transition: all 0.3s ease;
}

.diffusion-train-toggle:hover {
    border-color: rgba(236, 72, 153, 0.4);
    box-shadow: 0 0 20px rgba(236, 72, 153, 0.1);
}

.diffusion-train-toggle .toggle-label {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-family: var(--font-ui);
    color: var(--text-primary);
}

.diffusion-train-toggle input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

/* Training Controls */
.diffusion-train-controls {
    display: flex;
    flex-direction: column;
    gap: 0.875rem;
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 10px;
    margin-top: 0.5rem;
}

.diffusion-train-controls .train-control {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.diffusion-train-controls .train-control label {
    font-size: 0.7rem;
    font-family: var(--font-ui);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.diffusion-train-controls .train-control input {
    padding: 0.5rem 0.75rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.2);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

.diffusion-train-controls .train-control input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

.diffusion-train-controls .train-buttons {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.diffusion-train-controls .train-metrics {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(236, 72, 153, 0.15);
}

.diffusion-train-controls .metric-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

.diffusion-train-controls .metric-row span:first-child {
    color: var(--text-muted);
    font-family: var(--font-ui);
}

.diffusion-train-controls .metric-row span:last-child {
    color: var(--accent);
    font-family: var(--font-mono);
    font-weight: 500;
}

/* ==========================================
   CENTER - VISUALIZATION PANEL
   ========================================== */

.diffusion-visualization {
    display: flex;
    flex-direction: column;
    min-height: 0;
    gap: 0;
}

.diffusion-grid-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 16px;
    overflow: hidden;
    position: relative;
}

/* Gradient border glow */
.diffusion-grid-panel::before {
    content: '';
    position: absolute;
    inset: -1px;
    border-radius: 17px;
    padding: 1px;
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.3) 0%,
        transparent 30%,
        transparent 70%,
        rgba(244, 114, 182, 0.2) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    pointer-events: none;
}

/* Panel header */
.diffusion-grid-panel .viz-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.08) 0%,
        transparent 100%);
    border-bottom: 1px solid rgba(236, 72, 153, 0.1);
}

.diffusion-grid-panel .viz-panel__title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
}

.diffusion-grid-panel .viz-panel__content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    min-height: 0;
    background:
        radial-gradient(ellipse at center, rgba(236, 72, 153, 0.03) 0%, transparent 70%);
}

.diffusion-grid-panel canvas {
    max-width: 100%;
    max-height: 100%;
    image-rendering: pixelated;
    border-radius: 12px;
    background: var(--bg-deep);
    box-shadow:
        0 0 30px rgba(236, 72, 153, 0.1),
        inset 0 0 60px rgba(0, 0, 0, 0.3);
}

/* ==========================================
   PROGRESS BAR
   ========================================== */

.diffusion-progress {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(236, 72, 153, 0.05);
    border-top: 1px solid rgba(236, 72, 153, 0.1);
}

.diffusion-progress .progress-track {
    flex: 1;
    height: 8px;
    background: var(--bg-deep);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.3);
}

.diffusion-progress .progress-fill {
    height: 100%;
    background: linear-gradient(90deg,
        var(--accent) 0%,
        #f472b6 50%,
        #fb7185 100%);
    border-radius: 4px;
    transition: width 0.15s ease-out;
    position: relative;
    box-shadow: 0 0 10px var(--accent-glow);
}

/* Animated shimmer on progress */
.diffusion-progress .progress-fill::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.3) 50%,
        transparent 100%);
    animation: diffusion-progress-shimmer 1.5s ease-in-out infinite;
}

@keyframes diffusion-progress-shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

#diffusion-progress-text {
    font-size: 0.8rem;
    font-family: var(--font-mono);
    color: var(--accent);
    min-width: 90px;
    text-align: right;
    font-weight: 500;
}

/* ==========================================
   RIGHT SIDEBAR - TIMELINE
   ========================================== */

.diffusion-preview {
    display: flex;
    flex-direction: column;
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 16px;
    overflow: hidden;
}

/* Sidebar header */
.diffusion-preview .sidebar__header {
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.08) 0%,
        transparent 100%);
    border-bottom: 1px solid rgba(236, 72, 153, 0.1);
}

.diffusion-preview .sidebar__title {
    font-family: var(--font-display);
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-primary);
}

.diffusion-preview .sidebar__content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.diffusion-hint {
    font-size: 0.85rem;
    font-family: var(--font-body);
    color: var(--text-muted);
    text-align: center;
    padding: 1.25rem 1rem;
    font-style: italic;
}

/* Timeline Container */
.diffusion-timeline {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow-y: auto;
    padding: 1rem;
    background:
        linear-gradient(180deg, transparent 0%, rgba(236, 72, 153, 0.02) 100%);
}

.diffusion-timeline::-webkit-scrollbar {
    width: 4px;
}

.diffusion-timeline::-webkit-scrollbar-track {
    background: transparent;
}

.diffusion-timeline::-webkit-scrollbar-thumb {
    background: rgba(236, 72, 153, 0.3);
    border-radius: 2px;
}

.diffusion-timeline canvas {
    border-radius: 10px;
    background: var(--bg-deep);
    box-shadow:
        0 4px 20px rgba(0, 0, 0, 0.3),
        0 0 30px rgba(236, 72, 153, 0.08);
}

/* Timeline Scrubber */
.diffusion-scrubber {
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    background: rgba(236, 72, 153, 0.05);
    border-top: 1px solid rgba(236, 72, 153, 0.1);
}

.diffusion-scrubber input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-deep);
    border-radius: 3px;
    cursor: pointer;
}

.diffusion-scrubber input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
    transition: transform 0.2s ease;
}

.diffusion-scrubber input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.diffusion-scrubber input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--accent);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}

#diffusion-time-label {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    background: var(--accent-soft);
    border-radius: 20px;
}

/* ==========================================
   EXPLAINER MODAL STYLES
   ========================================== */

#diffusion-explainer-modal .explainer-modal__content {
    max-width: 1000px;
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.2);
}

#diffusion-explainer-modal .explainer-modal__header {
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.15) 0%,
        rgba(236, 72, 153, 0.05) 100%);
    border-bottom: 1px solid rgba(236, 72, 153, 0.2);
}

#diffusion-explainer-modal .explainer-tabs {
    background: rgba(236, 72, 153, 0.05);
    border-bottom: 1px solid rgba(236, 72, 153, 0.15);
}

#diffusion-explainer-modal .explainer-tab-btn {
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

#diffusion-explainer-modal .explainer-tab-btn:hover {
    color: var(--accent);
    background: rgba(236, 72, 153, 0.1);
}

#diffusion-explainer-modal .explainer-tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    background: rgba(236, 72, 153, 0.1);
}

/* Math Formulas */
.math-formula {
    background: var(--bg-deep);
    padding: 1.25rem;
    border-radius: 10px;
    border: 1px solid rgba(236, 72, 153, 0.15);
    margin: 1.25rem 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    overflow-x: auto;
    position: relative;
}

.math-formula::before {
    content: 'FORMULA';
    position: absolute;
    top: -0.5rem;
    left: 1rem;
    font-size: 0.6rem;
    font-family: var(--font-ui);
    color: var(--accent);
    background: var(--bg-deep);
    padding: 0 0.5rem;
    letter-spacing: 0.1em;
}

.math-formula code {
    color: #f472b6;
}

/* Key Insight Callout */
.key-insight {
    background: linear-gradient(135deg,
        rgba(236, 72, 153, 0.12) 0%,
        rgba(236, 72, 153, 0.06) 100%);
    border-left: 3px solid var(--accent);
    padding: 1rem 1.25rem;
    margin: 1.25rem 0;
    border-radius: 0 10px 10px 0;
    position: relative;
}

.key-insight::before {
    content: '!';
    position: absolute;
    left: -12px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
    color: white;
}

/* ==========================================
   INTERACTIVE DEMOS
   ========================================== */

/* Forward Process Demo */
.forward-process-demo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    margin: 1.25rem 0;
}

.forward-process-demo canvas {
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.forward-slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 450px;
}

.forward-slider-container label {
    font-size: 0.85rem;
    font-family: var(--font-ui);
    color: var(--text-secondary);
    white-space: nowrap;
}

.forward-slider-container input[type="range"] {
    flex: 1;
    accent-color: var(--accent);
}

.forward-slider-container span {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    min-width: 50px;
    color: var(--accent);
}

/* Reverse Process Demo */
.reverse-process-demo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    margin: 1.25rem 0;
}

.reverse-process-demo canvas {
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

/* U-Net Diagram */
.unet-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    margin: 1.25rem 0;
}

.unet-diagram canvas {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.unet-legend {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.25rem;
    flex-wrap: wrap;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.85rem;
    font-family: var(--font-ui);
    color: var(--text-secondary);
}

.legend-color {
    width: 18px;
    height: 18px;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* Noise Schedules Demo */
.schedules-demo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    margin: 1.25rem 0;
}

.schedules-demo canvas {
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.schedule-toggle {
    display: flex;
    gap: 0.5rem;
}

.schedule-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    font-family: var(--font-ui);
    background: var(--bg-card);
    border: 1px solid rgba(236, 72, 153, 0.2);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.schedule-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.schedule-btn--active {
    background: var(--accent) !important;
    border-color: var(--accent) !important;
    color: #0a0d17 !important;
    box-shadow: 0 0 15px var(--accent-glow);
    font-weight: 700;
}

/* Sampling Race */
.sampling-race {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 1.25rem 0;
    flex-wrap: wrap;
}

.sampling-track {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    min-width: 140px;
}

.sampling-track h4 {
    margin: 0;
    font-size: 0.9rem;
    font-family: var(--font-ui);
    color: var(--text-secondary);
    font-weight: 500;
}

.sampling-track canvas {
    border-radius: 6px;
    background: var(--bg-card);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.sampling-time {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--accent);
    padding: 0.25rem 0.5rem;
    background: var(--accent-soft);
    border-radius: 4px;
}

/* Guidance Demo */
.guidance-demo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.25rem;
    padding: 1.5rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    margin: 1.25rem 0;
}

.guidance-demo canvas {
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.guidance-slider-container {
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
    max-width: 450px;
}

.guidance-slider-container label {
    font-size: 0.85rem;
    font-family: var(--font-ui);
    color: var(--text-secondary);
    white-space: nowrap;
}

.guidance-slider-container input[type="range"] {
    flex: 1;
    accent-color: var(--accent);
}

.guidance-slider-container span {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 500;
    min-width: 35px;
    color: var(--accent);
}

/* Diffusion Diagram (Overview) */
.diffusion-diagram {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--bg-deep);
    border: 1px solid rgba(236, 72, 153, 0.15);
    border-radius: 12px;
    margin: 1.25rem 0;
}

.diffusion-diagram canvas {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

/* ==========================================
   ANIMATIONS
   ========================================== */

/* Generate Button Pulse */
@keyframes diffusion-pulse {
    0%, 100% {
        box-shadow:
            0 0 0 0 rgba(236, 72, 153, 0.5),
            0 4px 15px rgba(236, 72, 153, 0.3);
    }
    50% {
        box-shadow:
            0 0 0 12px rgba(236, 72, 153, 0),
            0 4px 25px rgba(236, 72, 153, 0.4);
    }
}

.diffusion-controls .btn--primary:not(:disabled) {
    animation: diffusion-pulse 2.5s ease-in-out infinite;
}

.diffusion-controls .btn--primary:disabled {
    animation: none;
}

/* Generate Button Loading State */
.diffusion-controls .btn--primary.generating {
    animation: none;
    opacity: 0.7;
    pointer-events: none;
    position: relative;
}

.diffusion-controls .btn--primary.generating::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.2) 50%,
        transparent 100%);
    animation: diffusion-btn-loading 1s linear infinite;
}

@keyframes diffusion-btn-loading {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Grid Cell Fade-in */
@keyframes diffusion-fadeIn {
    from {
        opacity: 0;
        transform: scale(0.92);
        filter: blur(4px);
    }
    to {
        opacity: 1;
        transform: scale(1);
        filter: blur(0);
    }
}

.diffusion-grid-panel canvas {
    animation: diffusion-fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Loading Spinner */
.diffusion-loading {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 2px solid rgba(236, 72, 153, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: diffusion-spin 0.8s linear infinite;
}

@keyframes diffusion-spin {
    to { transform: rotate(360deg); }
}

/* Noise Texture Animation */
@keyframes diffusion-noise {
    0%, 100% {
        background-position: 0% 0%;
        filter: contrast(1);
    }
    25% {
        background-position: 100% 0%;
    }
    50% {
        background-position: 100% 100%;
        filter: contrast(1.1);
    }
    75% {
        background-position: 0% 100%;
    }
}

/* Denoising Reveal Animation */
@keyframes diffusion-reveal {
    0% {
        clip-path: inset(0 100% 0 0);
    }
    100% {
        clip-path: inset(0 0 0 0);
    }
}

/* ==========================================
   RESPONSIVE BREAKPOINTS
   ========================================== */

/* Large Tablet (< 1200px) */
@media (max-width: 1199px) {
    .diffusion-main {
        grid-template-columns: 240px 1fr 220px;
        gap: 1rem;
    }

    .diffusion-grid-panel canvas {
        max-width: 400px;
    }
}

/* Tablet (< 1024px) */
@media (max-width: 1023px) {
    .diffusion-main {
        grid-template-columns: 220px 1fr 200px;
    }
}

/* Small Tablet (< 900px) */
@media (max-width: 899px) {
    .diffusion-main {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
        height: auto;
        max-height: none;
        gap: 1rem;
    }

    .diffusion-visualization {
        order: -1;
    }

    .diffusion-sidebar,
    .diffusion-preview {
        width: 100%;
        max-height: 350px;
        border-radius: 12px;
    }

    .diffusion-grid-panel {
        min-height: 400px;
    }

    .diffusion-grid-panel canvas {
        max-width: 350px;
        margin: 0 auto;
    }

    .diffusion-controls {
        flex-wrap: wrap;
        gap: 0.75rem;
    }

    .control-divider {
        display: none;
    }

    .sampling-race {
        gap: 1rem;
    }

    .sampling-track {
        min-width: 120px;
        padding: 1rem;
    }
}

/* Mobile (< 600px) */
@media (max-width: 599px) {
    .diffusion-main {
        padding: 0.75rem;
        gap: 0.75rem;
    }

    .diffusion-controls {
        padding: 0.75rem;
    }

    .control-section {
        flex: 1 1 auto;
        min-width: 100px;
    }

    .diffusion-grid-panel {
        min-height: 300px;
    }

    .diffusion-grid-panel canvas {
        max-width: 280px;
    }

    .diffusion-sidebar,
    .diffusion-preview {
        max-height: 280px;
    }

    /* Explainer Modal Responsive */
    #diffusion-explainer-modal .explainer-modal__content {
        max-width: 95vw;
        max-height: 95vh;
        margin: 0.5rem;
    }

    #diffusion-explainer-modal .explainer-tabs {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
        padding: 0.5rem;
    }

    #diffusion-explainer-modal .explainer-tab-btn {
        flex-shrink: 0;
        font-size: 0.75rem;
        padding: 0.5rem 0.75rem;
    }

    .forward-slider-container,
    .guidance-slider-container {
        flex-direction: column;
        align-items: stretch;
        gap: 0.5rem;
    }

    .sampling-race {
        flex-direction: column;
        align-items: center;
    }

    .sampling-track {
        width: 100%;
        max-width: 200px;
    }
}

/* Extra Small Mobile (< 400px) */
@media (max-width: 399px) {
    .diffusion-grid-panel canvas {
        max-width: 220px;
    }

    .diffusion-model-info .model-info-item {
        flex-direction: column;
        gap: 0.25rem;
        align-items: flex-start;
    }
}