/* ============================================
   RNN Hidden State Evolution Animation Styles
   Pure CSS implementation - no external libraries
   ============================================ */

/* ============================================
   Animation Section Container
   ============================================ */

.rnn-animation-section {
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 100%);
    border-radius: var(--radius-lg);
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    border: 2px solid rgba(99, 102, 241, 0.2);
    box-shadow: 0 10px 40px rgba(99, 102, 241, 0.1);
}

.rnn-animation-section.hidden {
    display: none;
}

.rnn-animation-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.rnn-animation-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #4f46e5;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.rnn-animation-header p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* ============================================
   Animation Controls
   ============================================ */

.rnn-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-lg);
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.rnn-control-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.rnn-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.rnn-btn-primary {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.rnn-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.rnn-btn-primary.playing {
    background: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
}

.rnn-btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.rnn-btn-secondary:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.rnn-btn svg {
    width: 16px;
    height: 16px;
}

/* Step Control */
.rnn-step-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.rnn-step-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.rnn-step-value {
    font-weight: 700;
    color: #6366f1;
    min-width: 60px;
    text-align: center;
}

.rnn-step-slider {
    width: 150px;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
}

.rnn-step-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
    transition: transform 0.2s ease;
}

.rnn-step-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

/* Speed Control */
.rnn-speed-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.rnn-speed-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.rnn-speed-btn {
    padding: var(--spacing-xs) var(--spacing-sm);
    border: 1px solid var(--border-color);
    background: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.rnn-speed-btn:hover {
    border-color: #6366f1;
    color: #6366f1;
}

.rnn-speed-btn.active {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border-color: transparent;
}

/* Status Indicator */
.rnn-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--text-muted);
}

.rnn-status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-color);
    transition: all 0.3s ease;
}

.rnn-status-dot.active {
    background: #22c55e;
    box-shadow: 0 0 10px rgba(34, 197, 94, 0.5);
    animation: statusPulse 1.5s ease infinite;
}

@keyframes statusPulse {

    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }

    50% {
        opacity: 0.7;
        transform: scale(1.1);
    }
}

/* ============================================
   RNN Sequence Visualization
   ============================================ */

.rnn-visualization {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.rnn-viz-label {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.rnn-viz-label span {
    font-weight: 600;
    color: var(--text-primary);
}

.rnn-viz-sublabel {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 400 !important;
    margin-top: var(--spacing-xs);
}

/* Sequence Container */
.rnn-sequence-wrapper {
    overflow-x: auto;
    padding: var(--spacing-md) 0;
}

.rnn-sequence {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0;
    min-width: max-content;
    padding: var(--spacing-md);
}

.rnn-sequence-item {
    display: flex;
    align-items: center;
}

/* ============================================
   RNN Cell
   ============================================ */

.rnn-cell-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    opacity: 0.5;
    transform: scale(0.95);
    transition: all 0.4s ease;
}

.rnn-cell-wrapper.active {
    opacity: 1;
    transform: scale(1);
}

/* Input Label */
.rnn-input-label {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: #6366f1;
    transition: all 0.3s ease;
}

.rnn-cell-wrapper.active .rnn-input-label {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
    animation: inputBounce 0.5s ease;
}

@keyframes inputBounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-4px);
    }
}

.rnn-var-name {
    font-weight: 600;
}

.rnn-subscript {
    font-size: 0.7em;
    vertical-align: sub;
}

.rnn-char-value {
    color: #22c55e;
}

.rnn-cell-wrapper.active .rnn-char-value {
    color: #a5f3fc;
}

/* Data Flow Arrow (vertical) */
.rnn-data-flow {
    width: 2px;
    height: 20px;
    background: linear-gradient(to bottom, rgba(99, 102, 241, 0.3), rgba(99, 102, 241, 0.6));
    position: relative;
}

.rnn-cell-wrapper.active .rnn-data-flow {
    background: linear-gradient(to bottom, #6366f1, #8b5cf6);
}

.rnn-cell-wrapper.active .rnn-data-flow::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background: #6366f1;
    border-radius: 50%;
    left: -2px;
    animation: dataFlowDown 0.8s ease infinite;
}

@keyframes dataFlowDown {
    0% {
        top: 0;
        opacity: 1;
    }

    100% {
        top: 100%;
        opacity: 0;
    }
}

/* Main Cell Block */
.rnn-cell-block {
    width: 90px;
    padding: var(--spacing-md);
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
    border: 2px solid #a5b4fc;
    border-radius: var(--radius-md);
    text-align: center;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.rnn-cell-wrapper.active .rnn-cell-block {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border-color: #4f46e5;
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.5);
    animation: cellPulse 1.5s ease infinite;
}

@keyframes cellPulse {

    0%,
    100% {
        box-shadow: 0 0 20px rgba(99, 102, 241, 0.4);
    }

    50% {
        box-shadow: 0 0 40px rgba(99, 102, 241, 0.6);
    }
}

.rnn-cell-title {
    font-weight: 700;
    font-size: 1rem;
    color: #4338ca;
    margin-bottom: 2px;
}

.rnn-cell-wrapper.active .rnn-cell-title {
    color: white;
}

.rnn-cell-subtitle {
    font-size: 0.65rem;
    color: #6366f1;
}

.rnn-cell-wrapper.active .rnn-cell-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

/* Cell Operations (shown when active) */
.rnn-cell-operations {
    margin-top: var(--spacing-sm);
    display: none;
}

.rnn-cell-wrapper.active .rnn-cell-operations {
    display: block;
    animation: fadeIn 0.3s ease;
}

.rnn-operation {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    font-size: 0.6rem;
    color: rgba(255, 255, 255, 0.9);
    margin-top: 4px;
}

.rnn-op-icon {
    font-size: 0.7rem;
}

/* Processing Indicator */
.rnn-processing-indicator {
    position: absolute;
    top: 5px;
    right: 5px;
    width: 12px;
    height: 12px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    display: none;
}

.rnn-cell-wrapper.active .rnn-processing-indicator {
    display: block;
    animation: spin 1s linear infinite;
}

/* Output Label */
.rnn-output-label {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
    color: #6366f1;
    transition: all 0.3s ease;
}

.rnn-cell-wrapper.active .rnn-output-label {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2) 0%, rgba(139, 92, 246, 0.2) 100%);
    animation: outputScale 0.5s ease;
}

@keyframes outputScale {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.rnn-dim-info {
    font-size: 0.7em;
    opacity: 0.8;
}

.rnn-superscript {
    font-size: 0.7em;
    vertical-align: super;
}

/* Hidden State Preview */
.rnn-hidden-preview {
    display: flex;
    gap: 2px;
    margin-top: var(--spacing-xs);
    justify-content: center;
}

.rnn-hidden-mini-cell {
    width: 10px;
    height: 10px;
    border-radius: 2px;
    transition: all 0.3s ease;
}

.rnn-hidden-more {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ============================================
   Arrow Between Cells
   ============================================ */

.rnn-arrow-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin: 0 var(--spacing-sm);
    min-width: 80px;
}

.rnn-arrow-svg {
    overflow: visible;
}

.rnn-arrow-line {
    transition: all 0.3s ease;
}

.rnn-arrow-active .rnn-arrow-line {
    stroke-width: 4;
    filter: drop-shadow(0 0 6px rgba(99, 102, 241, 0.5));
}

.rnn-arrow-dashes {
    stroke-dasharray: 8 8;
}

.rnn-arrow-active .rnn-arrow-dashes {
    animation: dashFlow 0.5s linear infinite;
}

@keyframes dashFlow {
    to {
        stroke-dashoffset: -16;
    }
}

.rnn-arrow-head {
    transition: all 0.3s ease;
}

.rnn-arrow-label {
    font-size: 0.75rem;
    font-family: 'Fira Code', monospace;
    color: #6366f1;
    opacity: 0.5;
    transition: all 0.3s ease;
    margin-top: 4px;
}

.rnn-arrow-active .rnn-arrow-label {
    opacity: 1;
    animation: labelBounce 0.5s ease;
}

@keyframes labelBounce {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-2px);
    }
}

/* Arrow Particles */
.rnn-arrow-particle {
    fill: #818cf8;
    opacity: 0;
}

.rnn-arrow-active .rnn-arrow-particle {
    animation: particleFlow 0.6s ease forwards;
}

@keyframes particleFlow {
    0% {
        opacity: 1;
        transform: translateX(0);
    }

    100% {
        opacity: 0;
        transform: translateX(70px);
    }
}

/* ============================================
   Step Explanation Panel
   ============================================ */

.rnn-step-explanation {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border-left: 4px solid #6366f1;
    animation: fadeIn 0.3s ease;
}

.rnn-explanation-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.rnn-step-badge {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.rnn-step-char {
    font-family: 'Fira Code', monospace;
    color: #6366f1;
    font-weight: 600;
}

.rnn-explanation-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

.rnn-explanation-text strong {
    color: #6366f1;
}

/* Formula Box */
.rnn-formula-box {
    display: inline-flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: white;
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.rnn-formula-legend {
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: 'Fira Code', monospace;
    opacity: 0.85;
}

.rnn-formula-note {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-style: italic;
    opacity: 0.75;
    border-top: 1px solid var(--border-color);
    padding-top: var(--spacing-xs);
    margin-top: 2px;
}

.rnn-formula-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 600;
}

.rnn-formula-code {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: #4338ca;
}

/* ============================================
   Hidden State Heatmap
   ============================================ */

.rnn-heatmap-section {
    margin-top: var(--spacing-xl);
}

.rnn-heatmap-container {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.rnn-heatmap-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-lg);
}

.rnn-heatmap-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.rnn-heatmap-subtitle {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Heatmap Grid */
.rnn-heatmap-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    overflow-x: auto;
}

.rnn-heatmap-y-labels {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding-top: 0;
    /* Align with grid */
}

.rnn-heatmap-y-label {
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    padding-right: var(--spacing-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.rnn-heatmap-grid {
    display: grid;
    gap: 4px;
}

.rnn-heatmap-column {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.rnn-heatmap-cell {
    width: 45px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: 0.65rem;
    font-weight: 600;
    transition: all 0.4s ease;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.rnn-heatmap-cell.active {
    transform: scale(1.1);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.6);
    z-index: 10;
}

.rnn-cell-value {
    font-family: 'Fira Code', monospace;
}

/* X-axis Labels */
.rnn-heatmap-x-labels {
    display: grid;
    gap: 4px;
    margin-top: var(--spacing-sm);
    padding-left: 40px;
    /* Align with grid */
}

.rnn-heatmap-x-label {
    text-align: center;
    font-family: 'Fira Code', monospace;
    font-size: 0.75rem;
    color: var(--text-muted);
    transition: all 0.3s ease;
}

.rnn-heatmap-x-label.active {
    color: #6366f1;
    font-weight: 700;
}

/* Color Legend */
.rnn-heatmap-legend {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    font-size: 0.8rem;
    color: var(--text-muted);
}

.rnn-legend-gradient {
    width: 150px;
    height: 12px;
    background: linear-gradient(to right, #3b82f6, #93c5fd, #ffffff, #fed7aa, #f97316);
    border-radius: 6px;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
    .rnn-controls {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .rnn-sequence {
        justify-content: flex-start;
    }

    .rnn-cell-block {
        width: 70px;
        padding: var(--spacing-sm);
    }

    .rnn-arrow-container {
        min-width: 50px;
    }

    .rnn-heatmap-cell {
        width: 35px;
        height: 28px;
        font-size: 0.55rem;
    }
}