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

body {
    font-family: Arial, sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    background-color: #333;
    color: white;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 15px;
}

.user-block {
    padding: 5px 15px;
    border-radius: 4px;
    border: 2px solid transparent;
    font-weight: bold;
    transition: background-color 0.3s;
}

.user-block[data-clickable="true"] {
    cursor: pointer;
}

.user-block[data-clickable="true"]:hover {
    background-color: #555;
}

.auth-action-btn {
    background-color: #6c757d;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 6px 15px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.auth-action-btn:hover {
    background-color: #5a6268;
}

.content {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.left {
    width: 250px;
    background-color: #f4f4f4;
    padding: 20px;
    border-right: 1px solid #ddd;
    overflow-y: auto;
}

.left h2 {
    margin-bottom: 15px;
    color: #333;
}

.create-room-btn {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    background-color: #28a745;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    font-weight: bold;
    transition: background-color 0.3s;
}

.create-room-btn:hover {
    background-color: #218838;
}

.room-section-header {
    padding: 8px 10px;
    color: #666;
    font-size: 12px;
    font-weight: bold;
    text-transform: uppercase;
}

.room-section-header:first-child {
    margin-top: 0;
}

.room {
    padding: 10px;
    margin-bottom: 8px;
    background-color: white;
    border-radius: 5px;
    cursor: pointer;
    border: 2px solid #ddd;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: background-color 0.2s;
}

.room:hover {
    background-color: #e8e8e8;
}

.room.active {
    background-color: #f0f0f0;
}

.room-color-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    flex-shrink: 0;
}

.room-title {
    font-size: 15px;
    flex: 1;
}

.room-subtitle {
    font-size: 11px;
    color: #aaa;
    margin-top: 2px;
}

.delete-room-btn {
    margin-left: auto;
    background: none;
    border: none;
    color: #dc3545;
    font-size: 18px;
    cursor: pointer;
    padding: 0 4px;
    opacity: 0;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.room:hover .delete-room-btn {
    opacity: 1;
}

.right {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 20px;
    background-color: white;
}

.room-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.room-header h2 {
    margin-bottom: 0;
    color: #333;
}

.room-creator {
    font-size: 12px;
    color: #999;
    margin-top: 2px;
}

.leave-room-btn,
.edit-room-btn {
    border: none;
    border-radius: 4px;
    padding: 5px 15px;
    cursor: pointer;
    font-size: 14px;
    flex-shrink: 0;
    transition: background-color 0.3s;
}

.leave-room-btn {
    background-color: #6c757d;
    color: white;
}

.leave-room-btn:hover {
    background-color: #5a6268;
}

.edit-room-btn {
    background-color: #007bff;
    color: white;
}

.edit-room-btn:hover {
    background-color: #0056b3;
}

.right-content {
    flex: 1;
    overflow-y: auto;
    padding: 10px 0;
}

.right-content.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    color: #999;
    font-size: 18px;
    text-align: center;
}

.right-content.empty-state p {
    max-width: 400px;
    line-height: 1.5;
}

.message {
    padding: 10px;
    margin-bottom: 8px;
    background-color: #f8f9fa;
    border-radius: 5px;
    border-left: 4px solid #007bff;
}

.nickname {
    font-weight: bold;
}

.message-text {
    color: #333;
}

hr {
    border: none;
    border-top: 1px solid #ddd;
    margin: 10px 0;
}

.input-block {
    display: flex;
    gap: 10px;
}

.input-block input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    outline: none;
}

.input-block input:focus {
    border-color: #007bff;
}

.send-button {
    background-color: #007bff;
    color: white;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s;
    white-space: nowrap;
}

.send-button:hover {
    background-color: #0056b3;
}

.modal {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 1001;
    min-width: 380px;
}

.modal-content {
    padding: 25px;
}

.modal h2 {
    margin-bottom: 15px;
    color: #333;
}

.modal p {
    margin-bottom: 8px;
    color: #666;
}

.modal input {
    width: 100%;
    padding: 10px;
    margin-bottom: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.modal input:focus {
    outline: none;
    border-color: #007bff;
}

.color-picker {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.color-option {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    border: 3px solid transparent;
    transition: transform 0.15s;
}

.color-option:hover {
    transform: scale(1.15);
}

.color-option.selected {
    border-color: #333;
    box-shadow: 0 0 0 2px white, 0 0 0 4px #333;
}

.modal-buttons {
    display: flex;
    gap: 10px;
}

.modal-buttons button,
.full-width-btn {
    padding: 10px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: background-color 0.3s;
}

.modal-buttons button {
    flex: 1;
}

.full-width-btn {
    width: 100%;
    margin-top: 10px;
}

#register-btn-modal,
#create-room-btn,
.full-width-btn {
    background-color: #28a745;
    color: white;
}

#register-btn-modal:hover,
#create-room-btn:hover,
.full-width-btn:hover {
    background-color: #218838;
}

#login-btn-modal {
    background-color: #007bff;
    color: white;
}

#login-btn-modal:hover {
    background-color: #0056b3;
}

#cancel-create-room {
    background-color: #6c757d;
    color: white;
}

#cancel-create-room:hover {
    background-color: #545b62;
}

.guest-btn {
    background-color: #6c757d;
}

.guest-btn:hover {
    background-color: #5a6268;
}

.close-modal {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 22px;
    cursor: pointer;
    color: #999;
}

.close-modal:hover {
    color: #333;
}

.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.system-message {
    text-align: center;
    color: #888;
    font-size: 12px;
    margin-bottom: 8px;
    font-style: italic;
}