:root {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --accent-blue: #4dabf7;
    --accent-red: #ff6b6b;
    --accent-yellow: #ffd43b;
    --border-color: rgba(255, 255, 255, 0.2);
    --input-bg: rgba(0, 0, 0, 0.5);
    --btn-off-text: #888;
}

body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0; padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    width: 100vw; height: 100vh;
    overflow: hidden;
}

#bgCanvas { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; }

#ui-container {
    display: flex; flex-direction: column; align-items: center;
    width: 100%; padding-top: 15px;
    transform-origin: top center;
}

/* 拡大率変化の整理 */
@media (max-height: 900px) { #ui-container { transform: scale(0.9); } }
@media (max-height: 750px) { #ui-container { transform: scale(0.8); } }
@media (max-height: 600px) { #ui-container { transform: scale(0.7); } }

h1 { font-size: 1.1rem; margin: 0 0 15px 0; opacity: 0.9; text-shadow: 0 2px 5px #000; }

.text-blue { color: var(--accent-blue); }
.text-red { color: var(--accent-red); }
.text-yellow { color: var(--accent-yellow); }

.formula-container {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 20px; margin-bottom: 15px;
    font-family: 'Times New Roman', serif; font-size: 1.5rem;
}

.matrix, .vector {
    display: inline-grid; gap: 5px 15px;
    border-left: 2px solid var(--text-color); border-right: 2px solid var(--text-color);
    padding: 5px 10px; border-radius: 6px; text-align: center;
    background: rgba(0,0,0,0.4); text-shadow: 0 1px 3px #000;
}
.matrix { grid-template-columns: 1fr 1fr; }
.vector { grid-template-columns: 1fr 1fr; }

.controls {
    display: flex; gap: 20px;
    width: 90%; max-width: 860px;
    justify-content: center; flex-wrap: wrap;
}

.left-column { display: flex; flex-direction: column; gap: 15px; flex: 1; min-width: 300px; }

.control-group { padding: 10px; }
.control-group h3 {
    margin: 0 0 10px 0; padding-bottom: 5px;
    font-size: 0.85rem; color: #aaa;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.slider-row { display: flex; align-items: center; margin-bottom: 5px; font-size: 0.85rem; }
.slider-row label { width: 40px; font-weight: bold; }

input[type="range"] { flex-grow: 1; margin: 0 10px; accent-color: #888; background: var(--input-bg); height: 6px; cursor: pointer; }
input[type="number"] { width: 50px; background: var(--input-bg); border: 1px solid var(--border-color); color: var(--text-color); border-radius: 4px; text-align: center; }

.c-group input[type="range"] { accent-color: var(--accent-blue); }
.op-group input[type="range"] { accent-color: var(--accent-yellow); }

.matrix-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.matrix-cell { background: rgba(0,0,0,0.3); padding: 8px; border-radius: 6px; }
.cell-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 4px; font-size: 0.8rem; }

.link-btn {
    background: rgba(255,255,255,0.1); color: var(--btn-off-text);
    border: 1px solid var(--border-color); border-radius: 4px;
    cursor: pointer; padding: 1px 6px; font-size: 0.9rem;
}
.link-btn.active { background: rgba(77, 171, 247, 0.3); color: var(--accent-blue); border-color: var(--accent-blue); }

.note { text-align: center; font-size: 0.7rem; color: #666; margin-top: 5px; }