/* Mail SPA - CSS Styles */

:root {
    --primary-color: #1a73e8;
    --primary-hover: #1557b0;
    --secondary-color: #5f6368;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --error-color: #d93025;
    --success-color: #1e8e3e;
    --border-color: #dadce0;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --sidebar-width: 256px;
    --header-height: 64px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background-color: var(--background-color);
}

/* Loading screen */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    gap: 16px;
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Auth pages (login) */
.auth-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-card {
    background: var(--surface-color);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}

.auth-card h1 {
    font-size: 24px;
    font-weight: 400;
    margin-bottom: 8px;
    text-align: center;
}

.auth-card .subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group .error {
    font-size: 12px;
    color: var(--error-color);
    margin-top: 4px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-primary:disabled {
    background-color: var(--border-color);
    cursor: not-allowed;
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: rgba(26, 115, 232, 0.04);
}

.btn-block {
    width: 100%;
}

/* Alert messages */
.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 16px;
    font-size: 14px;
}

.alert-error {
    background-color: #fce8e6;
    color: var(--error-color);
}

.alert-success {
    background-color: #e6f4ea;
    color: var(--success-color);
}

/* Main app layout */
.app-layout {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-size: 18px;
    font-weight: 500;
}

.sidebar-header .user-email {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.compose-btn {
    margin: 16px;
    padding: 12px 24px;
    border-radius: 24px;
    font-size: 14px;
}

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

.folder-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 16px;
}

.folder-item {
    display: flex;
    align-items: center;
    padding: 8px 24px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.folder-item:hover {
    background-color: rgba(0,0,0,0.04);
}

.folder-item.active {
    background-color: #e8f0fe;
    color: var(--primary-color);
    font-weight: 500;
}

.folder-item .folder-name {
    flex: 1;
    cursor: pointer;
}

.folder-item .folder-toggle {
    width: 16px;
    margin-right: 4px;
    font-size: 10px;
    cursor: pointer;
    color: var(--text-secondary);
}

.folder-item .folder-toggle:hover {
    color: var(--text-primary);
}

.folder-item .folder-toggle-spacer {
    width: 16px;
    margin-right: 4px;
}

.folder-item .folder-icon {
    margin-right: 8px;
    font-size: 14px;
}

.folder-item .unread-count {
    background-color: var(--primary-color);
    color: white;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 10px;
    font-weight: 500;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.sidebar-footer a {
    display: block;
    padding: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    cursor: pointer;
}

.sidebar-footer a:hover {
    color: var(--text-primary);
}

/* Main content area */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

/* Header */
.header {
    height: var(--header-height);
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 16px;
}

.header h2 {
    font-size: 18px;
    font-weight: 500;
    flex: 1;
}

.header-actions {
    display: flex;
    gap: 8px;
}

/* Message list toolbar */
.message-list-toolbar {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    background: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    gap: 16px;
}

.select-all-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
}

.bulk-actions {
    display: flex;
    gap: 8px;
}

.btn-sm {
    padding: 4px 12px;
    font-size: 12px;
}

/* Message list */
.message-list {
    flex: 1;
    overflow-y: auto;
    background: var(--surface-color);
}

.message-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
}

.message-item:hover {
    background-color: rgba(0,0,0,0.02);
}

.message-item.unread {
    background-color: #e8f0fe;
}

.message-item.unread .message-from,
.message-item.unread .message-subject {
    font-weight: 600;
}

.message-checkbox {
    margin-right: 12px;
}

.message-star {
    margin-right: 12px;
    color: var(--text-secondary);
    cursor: pointer;
}

.message-star.starred {
    color: #f4b400;
}

.message-from {
    width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

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

.message-subject {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-snippet {
    color: var(--text-secondary);
    margin-left: 4px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-date {
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: 16px;
    white-space: nowrap;
}

/* Message view */
.message-view {
    flex: 1;
    min-height: 0;
    overflow-y: auto;
    background: var(--surface-color);
    padding: 24px;
}

.message-view-header {
    margin-bottom: 24px;
}

.message-view-subject {
    font-size: 22px;
    font-weight: 400;
    margin-bottom: 16px;
}

.message-view-meta {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.message-view-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    font-weight: 500;
}

.message-view-from {
    flex: 1;
}

.message-view-from strong {
    display: block;
}

.message-view-from span {
    color: var(--text-secondary);
    font-size: 12px;
}

.message-view-date {
    color: var(--text-secondary);
    font-size: 12px;
}

.message-view-body {
    padding: 16px 0;
    line-height: 1.6;
}

.message-view-body.html-content {
    padding: 16px;
    background: var(--background-color);
    border-radius: 4px;
}

.message-view-actions {
    display: flex;
    gap: 8px;
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
}

.message-attachments {
    margin-top: 24px;
    padding: 16px;
    background: var(--background-color);
    border-radius: 4px;
}

.message-attachments h4 {
    margin-bottom: 12px;
    font-size: 14px;
}

.attachment-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.attachment-item:last-child {
    border-bottom: none;
}

.attachment-size {
    color: var(--text-secondary);
    font-size: 12px;
}

/* Compose */
.compose-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
}

.compose-header {
    display: flex;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.compose-header h2 {
    flex: 1;
    font-size: 18px;
    font-weight: 500;
}

.compose-form {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 16px;
}

.compose-field {
    display: flex;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.compose-field label {
    width: 60px;
    color: var(--text-secondary);
    font-size: 14px;
}

.compose-field input {
    flex: 1;
    border: none;
    font-size: 14px;
    padding: 8px;
}

.compose-field input:focus {
    outline: none;
}

.compose-body {
    flex: 1;
    margin-top: 16px;
}

.compose-body textarea {
    width: 100%;
    height: 100%;
    min-height: 300px;
    border: none;
    font-size: 14px;
    font-family: inherit;
    line-height: 1.6;
    resize: none;
}

.compose-body textarea:focus {
    outline: none;
}

.compose-actions {
    display: flex;
    gap: 12px;
    padding: 16px 0;
}

/* Empty state */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px;
    color: var(--text-secondary);
    text-align: center;
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 8px;
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    gap: 8px;
    border-top: 1px solid var(--border-color);
}

.pagination button {
    padding: 8px 16px;
}

.pagination span {
    color: var(--text-secondary);
    font-size: 13px;
}

/* Mobile layout */
.mobile-layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.mobile-layout #content-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 0;
    overflow-y: auto;
}

/* Mobile folders page */
.folders-page {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
}

.folders-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.folders-header .user-email {
    font-size: 14px;
    color: var(--text-secondary);
}

.folders-header .logout-link {
    color: var(--primary-color);
    cursor: pointer;
    font-size: 14px;
}

.compose-btn-full {
    margin: 16px;
    padding: 14px 24px;
    border-radius: 24px;
    font-size: 16px;
}

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

.folder-list-full .folder-item {
    padding: 14px 24px;
    font-size: 16px;
}

/* Icon buttons */
.btn-icon {
    background: none;
    border: none;
    font-size: 20px;
    padding: 8px;
    cursor: pointer;
    color: var(--text-primary);
}

.btn-icon:hover {
    background-color: rgba(0,0,0,0.04);
    border-radius: 50%;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }

    .mobile-menu-btn {
        display: none;
    }

    /* Multi-line message items on mobile */
    .message-item {
        flex-wrap: wrap;
        padding: 12px;
        align-items: flex-start;
    }

    .message-checkbox {
        margin-right: 8px;
        flex-shrink: 0;
        margin-top: 2px;
    }

    .message-star {
        margin-right: 8px;
        flex-shrink: 0;
        margin-top: 2px;
    }

    .message-from {
        width: auto;
        flex: 1;
        font-size: 15px;
        min-width: 0;
        order: 1;
    }

    .message-date {
        margin-left: auto;
        font-size: 12px;
        flex-shrink: 0;
        order: 2;
    }

    .message-content {
        width: 100%;
        flex: 0 0 100%;
        order: 3;
        margin-top: 4px;
        padding-left: 40px;
        display: block;
    }

    .message-subject {
        font-size: 14px;
        color: var(--text-secondary);
        white-space: normal;
        overflow: visible;
    }

    .message-item.unread .message-subject {
        color: var(--text-primary);
    }

    .message-snippet {
        display: none;
    }

    .auth-card {
        padding: 24px;
    }

    .message-view {
        padding: 16px;
    }

    .compose-form {
        padding: 12px;
    }
}

@media (min-width: 769px) {
    .mobile-menu-btn {
        display: none;
    }

    .back-btn {
        display: none;
    }
}

/* Utility classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-16 {
    margin-top: 16px;
}

.mb-16 {
    margin-bottom: 16px;
}