*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --bg-deep: #080810;
    --bg-mid: #0c0c1a;
    --bg-card: #11112a;
    --bg-card-hover: #181840;
    --cyan: #00f0ff;
    --magenta: #ff00e6;
    --green: #00ff8a;
    --orange: #ff8a00;
    --text: #d8d8e8;
    --text-dim: #6a6a8a;
    --mono: 'IBM Plex Mono', monospace;
    --sans: 'IBM Plex Sans', sans-serif;
}

body {
    background: var(--bg-deep);
    color: var(--text);
    font-family: var(--sans);
    min-height: 100vh;
    overflow-x: hidden;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(0, 240, 255, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 0, 230, 0.03) 0%, transparent 50%),
        linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
    background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
}

#app {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    padding: 40px 0 30px;
}

header h1 {
    font-family: var(--sans);
    font-weight: 800;
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    background: linear-gradient(135deg, var(--cyan), var(--magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
}

header .glyph {
    -webkit-text-fill-color: initial;
    font-size: 0.8em;
}

header .subtitle {
    font-family: var(--mono);
    font-size: 0.85rem;
    color: var(--text-dim);
    margin-top: 8px;
    font-weight: 300;
}

/* Upload Zone */
.upload-zone {
    border: 2px dashed rgba(0, 240, 255, 0.3);
    border-radius: 16px;
    padding: 60px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    background: rgba(0, 240, 255, 0.02);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--cyan), var(--magenta));
    opacity: 0;
    transition: opacity 0.4s;
    z-index: -1;
    filter: blur(20px);
}

.upload-zone:hover::before,
.upload-zone.dragover::before {
    opacity: 0.15;
}

.upload-zone:hover {
    border-color: rgba(0, 240, 255, 0.6);
    background: rgba(0, 240, 255, 0.04);
}

.upload-zone.dragover {
    border-color: var(--cyan);
    background: rgba(0, 240, 255, 0.08);
}

.upload-zone.has-image {
    padding: 20px;
    border-style: solid;
    border-color: rgba(0, 240, 255, 0.15);
}

.upload-icon { margin-bottom: 16px; }

.upload-text {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text);
}

.upload-hint {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-top: 6px;
}

/* Main Panel */
.main-panel { margin-top: 30px; }
.main-panel.hidden { display: none; }

.canvas-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: wrap;
}

.canvas-box {
    text-align: center;
}

.canvas-box label {
    display: block;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-bottom: 6px;
    font-weight: 400;
}

.canvas-box label span {
    color: var(--cyan);
}

.canvas-box canvas {
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 8px;
    image-rendering: pixelated;
    width: 180px;
    height: 180px;
    background: #000;
    display: block;
}

.canvas-arrow {
    font-size: 1.5rem;
    color: var(--text-dim);
    font-family: var(--mono);
    padding-top: 20px;
}

@media (max-width: 640px) {
    .canvas-box canvas { width: 140px; height: 140px; }
    .canvas-arrow { display: none; }
}

/* Slider */
.slider-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    padding: 0 10px;
}

.slider-label {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--text-dim);
    white-space: nowrap;
}

.slider-val {
    font-family: var(--mono);
    font-size: 0.8rem;
    color: var(--cyan);
    white-space: nowrap;
    min-width: 60px;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    border-radius: 2px;
    background: rgba(255,255,255,0.1);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--cyan);
    cursor: pointer;
    box-shadow: 0 0 10px var(--cyan);
}

/* Controls */
.controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 16px 0;
}

.btn {
    font-family: var(--mono);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 10px 20px;
    border: 1px solid;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    background: transparent;
}

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

.btn-train {
    color: var(--green);
    border-color: var(--green);
}
.btn-train:hover:not(:disabled) {
    background: rgba(0, 255, 138, 0.1);
    box-shadow: 0 0 20px rgba(0, 255, 138, 0.2);
}

.btn-forward {
    color: var(--cyan);
    border-color: var(--cyan);
}
.btn-forward:hover:not(:disabled) {
    background: rgba(0, 240, 255, 0.1);
    box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
}

.btn-reverse {
    color: var(--magenta);
    border-color: var(--magenta);
}
.btn-reverse:hover:not(:disabled) {
    background: rgba(255, 0, 230, 0.1);
    box-shadow: 0 0 20px rgba(255, 0, 230, 0.2);
}

.btn-reset {
    color: var(--text-dim);
    border-color: rgba(255,255,255,0.15);
}
.btn-reset:hover:not(:disabled) {
    background: rgba(255,255,255,0.05);
}

.controls-row-2 {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    margin: 10px 0 20px;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.control-group label {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-dim);
}

.control-group select {
    font-family: var(--mono);
    font-size: 0.75rem;
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 4px;
    padding: 4px 8px;
}

#speed-val {
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--cyan);
    min-width: 25px;
}

/* Neural Network Section */
.nn-section {
    margin: 30px 0;
    padding: 20px;
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
}

.nn-section h2 {
    font-family: var(--sans);
    font-weight: 200;
    font-size: 1.1rem;
    color: var(--text-dim);
    margin-bottom: 16px;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.nn-row {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.nn-row canvas {
    border-radius: 8px;
    background: rgba(0,0,0,0.3);
    max-width: 100%;
    height: auto;
}

.stats-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 16px;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.stat-label {
    font-family: var(--mono);
    font-size: 0.65rem;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-value {
    font-family: var(--mono);
    font-size: 0.9rem;
    font-weight: 600;
}

.status-idle { color: var(--text-dim); }
.status-training { color: var(--orange); }
.status-ready { color: var(--green); }
.status-running { color: var(--cyan); }

/* Info Section */
.info-section {
    margin: 20px 0;
}

.info-section details {
    background: var(--bg-card);
    border-radius: 12px;
    border: 1px solid rgba(255,255,255,0.05);
    overflow: hidden;
}

.info-section summary {
    padding: 16px 20px;
    cursor: pointer;
    font-family: var(--sans);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text);
    transition: background 0.2s;
}

.info-section summary:hover {
    background: rgba(255,255,255,0.02);
}

.info-content {
    padding: 0 20px 20px;
    font-size: 0.85rem;
    line-height: 1.7;
    color: var(--text-dim);
}

.info-content h3 {
    color: var(--cyan);
    font-size: 0.9rem;
    margin: 16px 0 6px;
    font-family: var(--mono);
}

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

.info-content em {
    color: var(--magenta);
    font-style: normal;
}

/* Footer */
footer {
    text-align: center;
    padding: 40px 0 20px;
    font-family: var(--mono);
    font-size: 0.75rem;
    color: var(--text-dim);
}

footer a {
    color: var(--cyan);
    text-decoration: none;
    display: inline-block;
    margin-top: 6px;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--magenta);
}

/* Animations */
@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 240, 255, 0.1); }
    50% { box-shadow: 0 0 40px rgba(0, 240, 255, 0.25); }
}

.training-active .btn-train {
    animation: pulse-glow 1s infinite;
}