:root {
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;
    --md-sys-color-surface: #FEF7FF;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-on-surface-variant: #49454F;
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;
    --md-sys-color-surface-container-lowest: #FFFFFF;
    --md-sys-color-surface-container-low: #F7F2FA;
    --md-sys-color-surface-container: #F3EDF7;
    --md-sys-color-surface-container-high: #ECE6F0;
    --md-sys-color-surface-container-highest: #E6E0E9;
    --md-sys-color-error: #B3261E;
    --md-sys-color-success: #386A20;
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--md-sys-color-surface-container-lowest);
    color: var(--md-sys-color-on-surface);
    height: 100vh;
    overflow: hidden;
}

.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--md-sys-color-primary-container) 0%, var(--md-sys-color-secondary-container) 100%);
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 440px;
}

.auth-card {
    padding: 32px;
    border-radius: 28px;
    max-width: 100%;
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-icon {
    font-size: 56px;
    color: var(--md-sys-color-primary);
    margin-bottom: 16px;
}

.auth-title {
    font-size: 24px;
    font-weight: 400;
    color: var(--md-sys-color-on-surface);
    margin-bottom: 8px;
}

.auth-subtitle {
    font-size: 14px;
    color: var(--md-sys-color-on-surface-variant);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.auth-form mdui-text-field {
    margin-bottom: 8px;
}

.auth-button {
    margin-top: 16px;
    border-radius: 20px;
}

.auth-switch {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 16px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: 14px;
}

.switch-button {
    --md-button-text-color: var(--md-sys-color-primary);
}

.chat-container {
    display: flex;
    height: 100vh;
    background: var(--md-sys-color-surface-container-lowest);
}

.sidebar {
    width: 360px;
    background: var(--md-sys-color-surface);
    border-right: 1px solid var(--md-sys-color-outline-variant);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    --md-top-app-bar-container-color: var(--md-sys-color-primary-container);
    --md-top-app-bar-on-container-color: var(--md-sys-color-on-primary-container);
    padding: 0 16px;
    border-radius: 0;
    border-bottom: none;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.username {
    font-size: 16px;
    font-weight: 500;
    color: var(--md-sys-color-on-primary-container);
}

.sidebar-actions {
    display: flex;
    gap: 4px;
}

.search-box {
    padding: 12px 16px;
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.search-box mdui-text-field {
    --md-text-field-container-color: var(--md-sys-color-surface-container-high);
    border-radius: 28px;
    overflow: hidden;
}

.sidebar-nav {
    --md-tabs-container-color: var(--md-sys-color-surface);
    padding: 8px 16px 0;
}

.conversation-list,
.user-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.conversation-item,
.user-item {
    padding: 12px 16px;
    cursor: pointer;
    transition: background 0.2s;
    display: flex;
    align-items: center;
    gap: 16px;
    border-radius: 28px;
    margin: 4px 8px;
}

.conversation-item:hover,
.user-item:hover {
    background: var(--md-sys-color-surface-container);
}

.conversation-item.active {
    background: var(--md-sys-color-secondary-container);
}

.conversation-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--md-sys-color-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-primary-container);
    font-size: 1.5em;
    flex-shrink: 0;
}

.conversation-info {
    flex: 1;
    min-width: 0;
}

.conversation-name {
    font-weight: 500;
    margin-bottom: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--md-sys-color-on-surface);
}

.conversation-time {
    font-size: 12px;
    color: var(--md-sys-color-on-surface-variant);
}

.conversation-preview {
    font-size: 13px;
    color: var(--md-sys-color-on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--md-sys-color-surface-container-lowest);
}

.chat-header {
    --md-top-app-bar-container-color: var(--md-sys-color-surface-container);
    --md-top-app-bar-on-container-color: var(--md-sys-color-on-surface);
    padding: 0 24px;
    border-radius: 0;
}

.chat-header-info {
    flex: 1;
}

.chat-title {
    font-size: 18px;
    font-weight: 500;
    display: block;
}

.chat-status {
    font-size: 12px;
    color: var(--md-sys-color-on-surface-variant);
    display: block;
    margin-top: 2px;
}

.chat-actions {
    display: flex;
    gap: 4px;
}

.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    background: var(--md-sys-color-surface-container-lowest);
}

.message {
    max-width: 75%;
    padding: 12px 16px;
    border-radius: 16px;
    word-wrap: break-word;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.message.sent {
    align-self: flex-end;
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    border-bottom-right-radius: 4px;
}

.message.received {
    align-self: flex-start;
    background: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface);
    border-bottom-left-radius: 4px;
}

.message-sender {
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 4px;
    opacity: 0.8;
}

.message-content {
    font-size: 14px;
    line-height: 1.4;
}

.message-time {
    font-size: 11px;
    margin-top: 4px;
    opacity: 0.7;
    text-align: right;
}

.message-image {
    max-width: 280px;
    max-height: 280px;
    border-radius: 12px;
    margin-top: 8px;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.message-input-container {
    padding: 16px 24px;
    background: var(--md-sys-color-surface-container);
    border-top: 1px solid var(--md-sys-color-outline-variant);
}

.message-input {
    display: flex;
    gap: 12px;
    align-items: flex-end;
}

.message-field {
    flex: 1;
    --md-text-field-container-color: var(--md-sys-color-surface-container-high);
    border-radius: 28px;
    overflow: hidden;
}

.image-preview {
    margin-bottom: 12px;
}

.preview-card {
    display: inline-block;
    padding: 8px;
    position: relative;
    border-radius: 16px;
}

.preview-card img {
    max-width: 200px;
    max-height: 150px;
    border-radius: 12px;
    display: block;
}

.remove-image {
    position: absolute;
    top: 4px;
    right: 4px;
    --md-button-icon-container-color: rgba(0,0,0,0.5);
    --md-button-icon-icon-color: white;
}

.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--md-sys-color-on-surface-variant);
    text-align: center;
    padding: 40px;
}

.empty-state .empty-icon {
    font-size: 72px;
    color: var(--md-sys-color-outline-variant);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-weight: 400;
    margin-bottom: 8px;
    color: var(--md-sys-color-on-surface);
}

.dialog-content {
    padding: 16px 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.dialog-content mdui-text-field {
    margin: 0;
}

.search-results {
    max-height: 200px;
    overflow-y: auto;
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: 12px;
    background: var(--md-sys-color-surface-container);
}

.search-result-item {
    padding: 12px 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: background 0.2s;
    border-radius: 12px;
    margin: 4px;
}

.search-result-item:hover {
    background: var(--md-sys-color-surface-container-high);
}

.selected-members {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.selected-member {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 13px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.selected-member .remove {
    cursor: pointer;
    font-weight: bold;
    opacity: 0.7;
}

.selected-member .remove:hover {
    opacity: 1;
}

.member-item {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-radius: 12px;
}

.member-item:hover {
    background: var(--md-sys-color-surface-container);
}

.online-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--md-sys-color-success);
    display: inline-block;
}

.offline-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--md-sys-color-outline);
    display: inline-block;
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -360px;
        top: 0;
        bottom: 0;
        z-index: 100;
        transition: left 0.3s;
        box-shadow: 2px 0 8px rgba(0,0,0,0.1);
    }
    
    .sidebar.open {
        left: 0;
    }
    
    .message {
        max-width: 85%;
    }
}