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

:root {
    --wa-green: #25d366;
    --wa-teal: #075e54;
    --wa-light-green: #dcf8c6;
    --wa-blue-1: #34b7f1;
    --wa-blue-2: #3b4a54;
    --wa-gray-1: #ece5dd;
    --wa-gray-2: #f0f2f5;
    --wa-gray-3: #8696a0;
    --wa-gray-4: #667781;
    --wa-white: #ffffff;
    --wa-panel-bg: #0b141a;
    --wa-panel-header: #202c33;
    --wa-message-bg: #005c4b;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--wa-gray-1);
    height: 100vh;
    overflow: hidden;
}

/* LOGIN PAGE */
.login-body {
    background: linear-gradient(to bottom, var(--wa-teal) 0%, var(--wa-teal) 130px, var(--wa-gray-2) 130px, var(--wa-gray-2) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-container {
    width: 100%;
    max-width: 500px;
    padding: 20px;
}

.login-box {
    background: var(--wa-white);
    border-radius: 8px;
    padding: 40px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}

.wa-logo {
    margin-bottom: 20px;
}

.login-box h1 {
    color: var(--wa-teal);
    margin-bottom: 10px;
    font-size: 28px;
}

.login-box p {
    color: var(--wa-gray-4);
    margin-bottom: 30px;
}

.login-box input {
    width: 100%;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    margin-bottom: 15px;
}

.login-box input:focus {
    outline: none;
    border-color: var(--wa-green);
}

.login-box button {
    width: 100%;
    padding: 15px;
    background-color: var(--wa-green);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
}

.login-box button:hover {
    background-color: #20ba5a;
}

.error-message {
    background-color: #fee;
    color: #c33;
    padding: 12px;
    border-radius: 4px;
    margin-bottom: 20px;
    font-size: 14px;
}

/* MAIN CONTAINER */
.container {
    display: flex;
    height: 100vh;
    max-width: 1600px;
    margin: 0 auto;
    background-color: var(--wa-white);
}

/* SIDEBAR */
.sidebar {
    width: 400px;
    background-color: var(--wa-white);
    border-right: 1px solid #e9edef;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    background-color: var(--wa-gray-2);
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid #e9edef;
}

.sidebar-header h2 {
    font-size: 20px;
    color: #111b21;
    font-weight: 600;
}

.logout-btn {
    background: none;
    border: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logout-btn:hover {
    background-color: #f0f2f5;
}

.chat-list {
    overflow-y: auto;
    flex: 1;
}

.chat-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid #f0f2f5;
    text-decoration: none;
    color: inherit;
    transition: background-color 0.2s;
}

.chat-item:hover {
    background-color: #f5f6f6;
}

.chat-item.active {
    background-color: #f0f2f5;
}

.chat-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667781 0%, #8696a0 100%);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 20px;
    flex-shrink: 0;
    margin-right: 15px;
}

.chat-info {
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.chat-name {
    font-weight: 500;
    font-size: 16px;
    color: #111b21;
    margin-bottom: 2px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-preview {
    display: none;
}

.chat-meta {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 4px;
    flex-shrink: 0;
    margin-left: 10px;
}

.chat-date {
    font-size: 12px;
    color: var(--wa-gray-4);
    white-space: nowrap;
}

.chat-count {
    font-size: 12px;
    color: var(--wa-gray-4);
}

.empty-state {
    padding: 40px 20px;
    text-align: center;
    color: var(--wa-gray-4);
}

.empty-state p {
    font-size: 16px;
    margin-bottom: 10px;
}

.empty-state small {
    font-size: 13px;
}

/* CHAT PANEL */
.chat-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: linear-gradient(to bottom, var(--wa-gray-1) 0%, var(--wa-gray-1) 100%);
    position: relative;
}

.chat-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill-rule='evenodd'%3E%3Cg fill='%23d4dbd8' fill-opacity='0.4'%3E%3Cpath opacity='.5' d='M96 95h4v1h-4v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9zm-1 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-9-10h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.06;
    pointer-events: none;
}

.chat-header {
    background-color: var(--wa-gray-2);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid #e9edef;
    z-index: 1;
}

.back-btn {
    display: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s;
}

.back-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.header-info h3 {
    font-size: 16px;
    color: #111b21;
    font-weight: 500;
}

.header-info p {
    font-size: 13px;
    color: var(--wa-gray-4);
    margin-top: 2px;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px 8%;
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: relative;
    z-index: 1;
}

.date-divider {
    display: flex;
    justify-content: center;
    margin: 15px 0;
}

.date-divider span {
    background-color: var(--wa-white);
    padding: 5px 12px;
    border-radius: 8px;
    font-size: 13px;
    color: var(--wa-gray-4);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.message {
    display: flex;
    flex-direction: column;
    margin-bottom: 4px;
    max-width: 65%;
    animation: fadeIn 0.2s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message.received {
    align-self: flex-start;
}

.message.sent {
    align-self: flex-end;
}

.message-sender {
    font-size: 13px;
    font-weight: 500;
    color: var(--wa-teal);
    margin-bottom: 2px;
    padding-left: 10px;
}

.message-bubble {
    background-color: var(--wa-white);
    padding: 6px 10px 8px;
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    position: relative;
}

.message.sent .message-bubble {
    background-color: var(--wa-light-green);
}

.message-text {
    font-size: 14.5px;
    line-height: 1.5;
    color: #111b21;
    word-wrap: break-word;
    padding-right: 50px;
}

.message-time {
    position: absolute;
    bottom: 6px;
    right: 10px;
    font-size: 11px;
    color: var(--wa-gray-4);
}

.media-placeholder {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px;
    background-color: rgba(0, 0, 0, 0.05);
    border-radius: 6px;
    color: var(--wa-gray-4);
}

.media-placeholder span {
    font-size: 13px;
}

.empty-chat {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--wa-gray-3);
    text-align: center;
    padding: 40px;
}

.empty-chat h3 {
    margin-top: 20px;
    margin-bottom: 10px;
    font-size: 32px;
    font-weight: 300;
    color: #41525d;
}

.empty-chat p {
    font-size: 14px;
    color: var(--wa-gray-4);
}

.empty-messages {
    text-align: center;
    padding: 40px;
    color: var(--wa-gray-4);
}

/* RESPONSIVE */
@media (max-width: 1024px) {
    .sidebar {
        width: 350px;
    }
}

@media (min-width: 769px) {
    /* En desktop, la sidebar SIEMPRE se muestra */
    .sidebar.mobile-hidden {
        display: flex !important;
    }

    .chat-panel.mobile-hidden {
        display: flex !important;
    }
}

@media (max-width: 768px) {
    .container {
        position: relative;
    }

    .sidebar {
        width: 100%;
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 10;
    }

    .chat-panel {
        width: 100%;
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 20;
    }

    .mobile-hidden {
        display: none;
    }

    .back-btn {
        display: flex;
    }

    .messages-container {
        padding: 20px 5%;
    }

    .message {
        max-width: 80%;
    }
}

/* SEARCH BUTTON */
.search-btn {
    background: none;
    border: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
}

.search-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

/* SEARCH PANEL */
.search-panel {
    background-color: var(--wa-white);
    border-bottom: 1px solid #e9edef;
    z-index: 2;
}

.search-input-container {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background-color: var(--wa-gray-2);
}

.search-input-container input {
    flex: 1;
    padding: 10px 15px;
    border: none;
    border-radius: 20px;
    background-color: var(--wa-white);
    font-size: 15px;
    outline: none;
}

.search-close-btn {
    background: none;
    border: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.search-close-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.search-results {
    max-height: 300px;
    overflow-y: auto;
    background-color: var(--wa-white);
}

.search-hint,
.search-no-results,
.search-error {
    padding: 20px;
    text-align: center;
    color: var(--wa-gray-4);
    font-size: 14px;
}

.search-count {
    padding: 10px 16px;
    background-color: var(--wa-gray-2);
    color: var(--wa-gray-4);
    font-size: 13px;
    font-weight: 500;
}

.search-result-item {
    padding: 12px 16px;
    border-bottom: 1px solid #f0f2f5;
    cursor: pointer;
    transition: background-color 0.2s;
}

.search-result-item:hover {
    background-color: #f5f6f6;
}

.search-result-sender {
    font-weight: 500;
    font-size: 14px;
    color: var(--wa-teal);
    margin-bottom: 4px;
}

.search-result-text {
    font-size: 14px;
    color: #111b21;
    margin-bottom: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.search-result-text mark {
    background-color: #fff3cd;
    color: #111b21;
    padding: 2px 4px;
    border-radius: 3px;
}

.search-result-date {
    font-size: 12px;
    color: var(--wa-gray-4);
}

.search-highlight {
    animation: highlightPulse 1s ease-in-out;
    background-color: rgba(255, 243, 205, 0.3) !important;
}

@keyframes highlightPulse {
    0%, 100% {
        background-color: rgba(255, 243, 205, 0.3);
    }
    50% {
        background-color: rgba(255, 243, 205, 0.8);
    }
}

/* LOADING INDICATOR */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 20px;
    gap: 10px;
}

.loading-indicator p {
    color: var(--wa-gray-4);
    font-size: 14px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--wa-gray-2);
    border-top-color: var(--wa-green);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* SCROLL TO BOTTOM BUTTON */
.scroll-to-bottom {
    position: absolute;
    bottom: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    background-color: var(--wa-white);
    border-radius: 50%;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s;
    z-index: 10;
}

.scroll-to-bottom:hover {
    background-color: var(--wa-gray-2);
    transform: scale(1.1);
}

.scroll-to-bottom svg {
    color: var(--wa-gray-4);
}

/* SCROLLBAR */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.3);
}

/* SIDEBAR ACTIONS */
.sidebar-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

.add-chat-btn {
    background: none;
    border: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.add-chat-btn:hover {
    background-color: #f0f2f5;
    color: var(--wa-green);
}

/* CHAT ITEM WRAPPER & DELETE BUTTON */
.chat-item-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.chat-item-wrapper .chat-item {
    flex: 1;
}

.chat-actions {
    display: flex;
    gap: 2px;
    opacity: 0;
    transition: opacity 0.3s;
}

.chat-item-wrapper:hover .chat-actions {
    opacity: 1;
}

.delete-chat-btn,
.rename-chat-btn {
    background: none;
    border: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 6px 8px;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.rename-chat-btn:hover {
    color: var(--wa-green);
    background-color: rgba(37, 211, 102, 0.1);
}

.delete-chat-btn:hover {
    color: #dc3545;
    background-color: rgba(220, 53, 69, 0.1);
}

/* MODAL */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background-color: var(--wa-white);
    border-radius: 8px;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.modal-small {
    max-width: 400px;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #e9edef;
}

.modal-header h3 {
    font-size: 18px;
    color: #111b21;
    font-weight: 600;
}

.modal-close {
    background: none;
    border: none;
    color: var(--wa-gray-4);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background-color 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.modal-body {
    padding: 20px;
}

.modal-body p {
    color: var(--wa-gray-4);
    margin-bottom: 20px;
}

/* UPLOAD AREA */
.upload-area {
    border: 2px dashed #d4dbd8;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--wa-green);
    background-color: rgba(37, 211, 102, 0.05);
}

.upload-area svg {
    margin-bottom: 15px;
}

.upload-area p {
    font-size: 16px;
    color: #111b21;
    margin-bottom: 5px;
}

.upload-area small {
    font-size: 13px;
    color: var(--wa-gray-4);
}

.upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* UPLOAD PROGRESS */
.upload-progress {
    margin-top: 20px;
}

.progress-bar {
    height: 6px;
    background-color: #e9edef;
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-fill {
    height: 100%;
    background-color: var(--wa-green);
    width: 0%;
    transition: width 0.3s ease;
}

.upload-progress p {
    font-size: 14px;
    color: var(--wa-gray-4);
    margin: 0;
}

/* MODAL ACTIONS */
.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.btn-secondary,
.btn-danger,
.btn-primary {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-secondary {
    background-color: #f0f2f5;
    color: #111b21;
}

.btn-secondary:hover {
    background-color: #e4e6eb;
}

.btn-danger {
    background-color: #dc3545;
    color: white;
}

.btn-danger:hover {
    background-color: #c82333;
}

.btn-primary {
    background-color: var(--wa-green);
    color: white;
}

.btn-primary:hover {
    background-color: #20ba5a;
}

/* Input en modal */
#renameForm input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 1px solid #d4dbd8;
    border-radius: 6px;
    font-size: 15px;
    margin-bottom: 20px;
    outline: none;
}

#renameForm input[type="text"]:focus {
    border-color: var(--wa-green);
}

/* RESPONSIVE MODAL */
@media (max-width: 768px) {
    .chat-actions {
        opacity: 1;
    }

    .modal-content {
        width: 95%;
    }
}