:root {
    --bg: #f5f0e8;
    --panel: #ffffff;
    --text: #333;
    --accent: #5b7bb5;
    --border: #d5cfc6;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

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

body {
    background: var(--bg);
    font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 15px;
    color: var(--text);
}

.container {
    max-width: 780px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

h1 {
    text-align: center;
    font-size: 1.6rem;
    font-weight: 600;
    letter-spacing: 0.3px;
    color: #444;
    margin-bottom: 2px;
}

.canvas-wrapper {
    background: var(--panel);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 8px;
    display: flex;
    justify-content: center;
    border: 1px solid var(--border);
}

canvas {
    display: block;
    border-radius: 8px;
    max-width: 100%;
    height: auto;
}

#simCanvas {
    background: #fdfdfb;
    cursor: pointer;
}

#graphCanvas {
    background: #fdfdfb;
    cursor: default;
}

.controls {
    background: var(--panel);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 16px 20px;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.control-section {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 20px;
    align-items: center;
}

.control-section h3 {
    width: 100%;
    font-size: 0.95rem;
    font-weight: 600;
    color: #555;
    margin-bottom: -4px;
    border-bottom: 1px solid #ebe6dc;
    padding-bottom: 5px;
    letter-spacing: 0.3px;
}

.slider-group {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1 1 180px;
    min-width: 160px;
}

.slider-group label {
    font-size: 0.82rem;
    font-weight: 500;
    white-space: nowrap;
    min-width: 55px;
    color: #555;
}

.slider-group input[type="range"] {
    flex: 1;
    min-width: 70px;
    accent-color: var(--accent);
    height: 6px;
}

.slider-group .value-display {
    font-size: 0.78rem;
    font-weight: 600;
    min-width: 44px;
    text-align: right;
    color: #444;
    background: #f9f7f3;
    padding: 2px 7px;
    border-radius: 4px;
    border: 1px solid #e8e3d9;
}

.button-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

button {
    padding: 8px 16px;
    border: 1px solid #ccc;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    background: #f9f7f3;
    color: #444;
    transition: all 0.15s;
    letter-spacing: 0.2px;
    white-space: nowrap;
}

button:hover {
    background: #eee9df;
    border-color: #bbb;
}

button:active {
    transform: scale(0.97);
    background: #e5dfd4;
}

button.primary {
    background: var(--accent);
    color: #fff;
    border-color: #4a699e;
    font-weight: 600;
}

button.primary:hover {
    background: #4a699e;
}

button.danger {
    background: #e0745e;
    color: #fff;
    border-color: #c25a46;
}

button.danger:hover {
    background: #c25a46;
}

.pendulum-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.pendulum-tag {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 500;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.15s;
    background: #f9f7f3;
    user-select: none;
}

.pendulum-tag.selected {
    border-color: #333;
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.07);
    background: #fff;
}

.pendulum-tag .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

.pendulum-tag .remove-x {
    margin-left: 2px;
    font-weight: 700;
    color: #c55;
    cursor: pointer;
    font-size: 1rem;
    line-height: 1;
    padding: 0 3px;
}

.pendulum-tag .remove-x:hover {
    color: #900;
}

.info-text {
    font-size: 0.75rem;
    color: #888;
    text-align: center;
    margin-top: 2px;
}

@media (max-width: 600px) {
    .slider-group {
        flex: 1 1 130px;
        min-width: 130px;
    }
    .slider-group label {
        font-size: 0.7rem;
        min-width: 42px;
    }
    button {
        padding: 6px 10px;
        font-size: 0.75rem;
    }
    h1 {
        font-size: 1.2rem;
    }
    .canvas-wrapper {
        padding: 3px;
        border-radius: 10px;
    }
}

        .navbar a {
            color: #5b7bb5;
            font-weight: 600;
            text-decoration: none;
            margin: 0 12px;
            font-size: 0.95rem;
        }
        .navbar a:hover {
            text-decoration: underline;
        }
        .navbar {
            background: #ffffff;
            border-radius: 14px;
            padding: 12px 20px;
            margin-bottom: 14px;
            text-align: center;
            box-shadow: 0 4px 12px rgba(0,0,0,0.06);
            border: 1px solid #d5cfc6;
        }