:root {
    --bg-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333;
    --primary-color: #3498db;
    --danger-color: #e74c3c;
    --option-bg: #ecf0f1;
    --border-color: #dddddd;
}

body.dark-mode {
    --bg-color: #2c3e50;
    --container-bg: #34495e;
    --text-color: #ecf0f1;
    --option-bg: #2c3e50;
    --border-color: #4a627a;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 600px;
    text-align: center;
    transition: background-color 0.3s;
}

h1, h2 {
    margin-top: 0;
}

.wheel-container {
    position: relative;
    width: 80%;
    max-width: 500px;
    margin: 20px auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.wheel-pointer {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 20px solid transparent;
    border-right: 20px solid transparent;
    border-top: 30px solid var(--danger-color);
    z-index: 10;
    filter: drop-shadow(0 0 2px black);
}

#wheelCanvas {
    width: 100%;
    height: auto;
    border-radius: 50%;
    transition: transform 5s ease-out;
}

#spinBtn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1.2em;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    margin-top: 10px;
}

#spinBtn:hover {
    background-color: #2980b9;
}

#spinBtn:disabled {
    background-color: #bdc3c7;
    cursor: not-allowed;
}

.controls, .options-list {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

.controls input {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-size: 1em;
}

.controls input#optionInput {
    flex: 2 1 150px;
}

.controls input#percentageInput {
    flex: 1 1 80px;
}

#addBtn {
    background-color: #2ecc71;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s;
}

#addBtn:hover {
    background-color: #27ae60;
}

#optionsUl {
    list-style: none;
    padding: 0;
    margin-top: 15px;
}

#optionsUl li {
    background-color: var(--option-bg);
    margin-bottom: 8px;
    padding: 10px 15px;
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.3s;
}

.delete-btn {
    background-color: var(--danger-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

.delete-btn:hover {
    background-color: #c0392b;
}

#totalPercentage {
    font-weight: bold;
}

/* Theme Switcher */
.theme-switch-container {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary-color);
}

input:checked + .slider:before {
    transform: translateX(26px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

@media (max-width: 640px) {
    body {
        padding: 10px;
    }
    .container {
        padding: 20px;
    }
    .controls {
        flex-direction: column;
    }
    .controls input {
        width: calc(100% - 20px);
    }
}