:root {
    --bg-color: #f2f3f3;
    --container-bg: #ffffff;
    --section-bg: #f8f8f8;
    --text-color: #16191f;
    --text-secondary: #687078;
    --border-color: #eaeded;
    --border-input: #d5dbdb;
    --primary-color: #ff9900;
    --primary-hover: #ffac31;
    --secondary-color: #007eb9;
    --secondary-hover: #0098db;
    --shadow-color: rgba(0, 0, 0, 0.08);
}

.dark-mode {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --section-bg: #2d2d2d;
    --text-color: #f0f0f0;
    --text-secondary: #b0b0b0;
    --border-color: #3d3d3d;
    --border-input: #4d4d4d;
    --primary-color: #ff9900;
    --primary-hover: #ffac31;
    --secondary-color: #0098db;
    --secondary-hover: #00b0ff;
    --shadow-color: rgba(0, 0, 0, 0.2);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Amazon Ember', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
    background-color: var(--bg-color);
    padding: 20px;
    color: var(--text-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    background-color: var(--container-bg);
    border-radius: 8px;
    box-shadow: 0 2px 10px var(--shadow-color);
    padding: 24px;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

h1 {
    color: var(--text-color);
    font-weight: 500;
    margin: 0;
}

.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 20px;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--section-bg);
    transition: background-color 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--border-color);
}

.light-mode .dark-icon {
    display: none;
}

.dark-mode .light-icon {
    display: none;
}

h2 {
    margin-bottom: 16px;
    color: var(--text-color);
    font-weight: 500;
}

.input-section {
    margin-bottom: 32px;
    padding: 24px;
    border-radius: 8px;
    background-color: var(--section-bg);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.results-section {
    margin-bottom: 32px;
    padding: 24px;
    border-radius: 8px;
    background-color: var(--section-bg);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    transition: color 0.3s ease;
}

textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-input);
    border-radius: 4px;
    resize: vertical;
    font-size: 16px;
    background-color: var(--container-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

textarea:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(0, 126, 185, 0.2);
    outline: none;
}

.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    flex-wrap: wrap;
}

.group-control {
    display: flex;
    align-items: center;
    gap: 12px;
}

label {
    font-weight: 500;
    color: var(--text-color);
    transition: color 0.3s ease;
}

input[type="number"] {
    width: 80px;
    padding: 10px;
    border: 1px solid var(--border-input);
    border-radius: 4px;
    font-size: 16px;
    background-color: var(--container-bg);
    color: var(--text-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

input[type="number"]:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 2px rgba(0, 126, 185, 0.2);
    outline: none;
}

.buttons {
    display: flex;
    gap: 12px;
}

button {
    padding: 10px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s;
}

#groupButton {
    background-color: var(--primary-color);
    color: #000000;
    border: 1px solid var(--primary-color);
}

#groupButton:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

#clearButton {
    background-color: var(--container-bg);
    color: var(--text-color);
    border: 1px solid var(--border-input);
}

#clearButton:hover {
    background-color: var(--section-bg);
}

.cookie-notice {
    margin-top: 16px;
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    transition: color 0.3s ease;
}

.results-actions {
    margin-bottom: 16px;
    display: flex;
    justify-content: flex-end;
}

#exportButton {
    background-color: var(--secondary-color);
    color: white;
    border: 1px solid var(--secondary-color);
}

#exportButton:hover {
    background-color: var(--secondary-hover);
    border-color: var(--secondary-hover);
}

.group-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.group {
    background-color: var(--container-bg);
    border-radius: 8px;
    padding: 16px;
    box-shadow: 0 1px 3px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.group-title {
    font-weight: 500;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-color);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.group-members {
    list-style-position: inside;
    color: var(--text-secondary);
    transition: color 0.3s ease;
}

.group-members li {
    margin-bottom: 6px;
    padding: 4px 0;
}

@media (max-width: 600px) {
    .controls {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }
    
    .buttons {
        width: 100%;
    }
    
    button {
        flex: 1;
    }
}