/* ============================================
   PEDAGOGICAL DGLAP EVOLUTION — CSS
   ============================================ */
:root {
    --bg-void: #05050a;
    --val-color: #ff3366;
    --gluon-color: #00ff88;
    --sea-color: #9933ff;
    
    --accent-blue: #44aaff;
    --text-primary: rgba(240, 245, 255, 0.95);
    --text-sec: rgba(160, 180, 220, 0.6);
    --text-hi: #44ddff;
    
    --glass-bg: rgba(10, 15, 30, 0.65);
    --glass-border: rgba(68, 140, 255, 0.15);
    --glass-shadow: rgba(0, 0, 0, 0.5);
    
    --font-ui: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
}

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

html, body {
    width: 100%; height: 100%; overflow: hidden;
    background: var(--bg-void);
    font-family: var(--font-ui);
    color: var(--text-primary);
}

#main-canvas { position: fixed; inset: 0; z-index: 1; }

.ui-overlay { position: fixed; inset: 0; z-index: 10; pointer-events: none; }
.ui-overlay > * { pointer-events: auto; }
.ui-overlay.hidden > *:not(.toggle-ui):not(.fullscreen-btn) {
    opacity: 0; transform: translateY(20px); pointer-events: none;
}

/* Glass Cards */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    box-shadow: 0 8px 32px var(--glass-shadow);
    transition: all 0.3s ease;
}

/* Title */
.title-bar {
    position: absolute; top: 20px; left: 50%; transform: translateX(-50%);
    padding: 12px 30px; display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.title-main { font-size: 1.4rem; font-weight: 700; letter-spacing: 1px; color: #fff; }
.title-eq { font-family: var(--font-mono); font-size: 0.8rem; color: var(--text-hi); }
.title-eq sub { font-size: 0.6rem; }

/* Evolution Panel */
.evo-panel {
    position: absolute; top: 80px; left: 24px; width: 260px; padding: 16px;
}
.evo-header { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 8px;}
.pulse-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent-blue); box-shadow: 0 0 10px var(--accent-blue); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(0.6); opacity: 0.5; } }
.evo-label { font-size: 0.65rem; font-weight: 600; letter-spacing: 2px; color: var(--text-sec); }

.evo-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 16px; }
.evo-cell { display: flex; flex-direction: column; }
.evo-key { font-family: var(--font-mono); font-size: 0.55rem; color: var(--text-sec); text-transform: uppercase; }
.evo-key sub { font-size: 0.45rem; }
.evo-val { font-family: var(--font-mono); font-size: 1.1rem; font-weight: 700; color: var(--text-hi); }
.evo-unit { font-family: var(--font-mono); font-size: 0.5rem; color: var(--text-sec); }

.mom-section { border-top: 1px solid rgba(255,255,255,0.05); padding-top: 12px; }
.mom-title { font-size: 0.55rem; font-weight: 600; letter-spacing: 1px; margin-bottom: 8px; color: var(--text-sec); }
.mom-bar { display: flex; height: 8px; border-radius: 4px; overflow: hidden; gap: 2px; margin-bottom: 10px; background: rgba(0,0,0,0.3); }
.mom-seg { transition: width 0.3s ease; }
.seg-val { background: var(--val-color); }
.seg-sea { background: var(--sea-color); }
.seg-gluon { background: var(--gluon-color); }

.mom-legend { display: flex; flex-direction: column; gap: 4px; }
.leg-item { display: flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 0.6rem; color: #ddd; }
.leg-dot { width: 8px; height: 8px; border-radius: 2px; }
.dot-val { background: var(--val-color); }
.dot-sea { background: var(--sea-color); }
.dot-gluon { background: var(--gluon-color); }
.leg-pct { margin-left: auto; color: var(--text-hi); font-weight: 600; }

/* Insight Panel */
.insight-panel {
    position: absolute; bottom: 80px; left: 50%; transform: translateX(-50%);
    padding: 12px 24px; max-width: 500px; display: flex; align-items: center; gap: 12px;
    background: rgba(40, 60, 100, 0.4); border-color: var(--accent-blue);
}
.insight-icon { font-size: 1.5rem; }
.insight-text { font-size: 0.95rem; line-height: 1.4; color: #fff; font-weight: 500; }

/* Splitting Panel */
.split-panel {
    position: absolute; top: 350px; left: 24px; width: 260px; padding: 16px;
}
.split-title { font-size: 0.65rem; font-weight: 600; letter-spacing: 2px; color: var(--text-sec); border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 8px; margin-bottom: 12px; }
.split-grid { display: flex; flex-direction: column; gap: 10px; }
.split-card { background: rgba(0,0,0,0.2); padding: 8px; border-radius: 8px; transition: transform 0.2s; border: 1px solid transparent; }
.split-card.active { border-color: rgba(255,255,255,0.2); background: rgba(255,255,255,0.05); }
.sc-diagram { font-family: var(--font-mono); font-size: 0.9rem; font-weight: 700; margin-bottom: 2px; }
.sc-q { color: var(--val-color); }
.sc-g { color: var(--gluon-color); }
.sc-sea { color: var(--sea-color); }
.sc-arrow { color: #888; margin: 0 4px; font-weight: normal; }
.sc-label { font-family: var(--font-mono); font-size: 0.65rem; color: var(--text-hi); margin-bottom: 4px; }
.sc-desc { font-size: 0.65rem; color: #bbb; line-height: 1.3; }

/* Controls Panel */
.controls-panel {
    position: absolute; top: 80px; right: 24px; width: 250px; padding: 16px; display: flex; flex-direction: column; gap: 16px;
}
.ctrl-title { font-size: 0.65rem; font-weight: 600; letter-spacing: 2px; color: var(--text-sec); border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 8px; }
.control-group { display: flex; flex-direction: column; gap: 6px; }
.control-group label { font-size: 0.6rem; font-weight: 600; text-transform: uppercase; color: #ddd; }
input[type="range"] { -webkit-appearance: none; width: 100%; height: 4px; background: rgba(255,255,255,0.1); border-radius: 2px; outline: none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; border-radius: 50%; background: var(--text-hi); cursor: pointer; }
.slider-ends { display: flex; justify-content: space-between; font-family: var(--font-mono); font-size: 0.5rem; color: #888; }
.control-toggle { display: flex; justify-content: space-between; align-items: center; }
.control-toggle label { font-size: 0.6rem; font-weight: 600; text-transform: uppercase; color: #ddd; }
.toggle-switch { position: relative; width: 40px; height: 22px; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider-el { position: absolute; inset: 0; background: rgba(255,255,255,0.1); border-radius: 20px; cursor: pointer; transition: 0.3s; }
.toggle-slider-el::before { content: ''; position: absolute; width: 16px; height: 16px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: 0.3s; }
.toggle-switch input:checked + .toggle-slider-el { background: var(--text-hi); }
.toggle-switch input:checked + .toggle-slider-el::before { transform: translateX(18px); background: #000; }

/* Legend Panel */
.legend-panel { position: absolute; bottom: 80px; right: 24px; padding: 16px; width: 250px; }
.legend-title { font-size: 0.65rem; font-weight: 600; letter-spacing: 2px; color: var(--text-sec); border-bottom: 1px solid rgba(255,255,255,0.1); padding-bottom: 8px; margin-bottom: 12px; }
.legend-entries { display: flex; flex-direction: column; gap: 10px; }
.le-row { display: flex; align-items: center; gap: 10px; }
.le-swatch { width: 24px; height: 4px; border-radius: 2px; }
.le-sw-val { background: var(--val-color); box-shadow: 0 0 6px var(--val-color); }
.le-sw-gluon { background: var(--gluon-color); box-shadow: 0 0 6px var(--gluon-color); }
.le-sw-sea { background: var(--sea-color); box-shadow: 0 0 6px var(--sea-color); }
.le-text { font-family: var(--font-mono); font-size: 0.65rem; color: #ccc; }
.le-text sub { font-size: 0.55rem; }

/* Bottom widgets */
.info-bar { position: absolute; bottom: 20px; left: 24px; display: flex; gap: 8px; }
.widget { padding: 8px 16px; display: flex; flex-direction: column; align-items: center; gap: 2px; }
.widget-label { font-family: var(--font-mono); font-size: 0.5rem; color: var(--text-sec); text-transform: uppercase; }
.widget-value { font-family: var(--font-mono); font-size: 1rem; font-weight: 700; color: #fff; }

.toggle-ui, .fullscreen-btn { position: absolute; bottom: 20px; width: 44px; height: 44px; border: none; color: #fff; cursor: pointer; display: flex; justify-content: center; align-items: center; }
.toggle-ui { right: 24px; }
.fullscreen-btn { right: 76px; }
.toggle-ui:hover, .fullscreen-btn:hover { background: rgba(255,255,255,0.2); }

/* responsive adjustments */
@media (max-width: 1000px) {
    .split-panel { display: none; }
    .evo-panel { top: 70px; left: 10px; width: 220px; }
    .controls-panel { top: 70px; right: 10px; width: 220px; }
    .legend-panel { bottom: 70px; right: 10px; width: 220px; }
    .insight-panel { bottom: 100px; width: 80%; }
    .title-main { font-size: 1.1rem; }
}