/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow);
}

.nav-brand a {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-link {
    color: var(--text);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    transition: all 0.2s;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.nav-link:hover {
    background: var(--bg);
}

/* Dropdown */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    right: 0;
    top: 100%;
    margin-top: 0.5rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    z-index: 50;
}

.dropdown-item {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--text);
    text-decoration: none;
    transition: background 0.2s;
}

.dropdown-item:hover {
    background: var(--bg);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 180px);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.5rem;
    margin: 1rem 2rem;
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #10b981;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #ef4444;
}

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

.auth-box {
    background: var(--surface);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 450px;
}

.auth-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
    text-align: center;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border);
}

.tab {
    flex: 1;
    padding: 0.75rem;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-muted);
    transition: all 0.2s;
    margin-bottom: -2px;
}

.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text);
}

.form-input,
.form-select,
.form-textarea,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
select,
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-size: 1rem;
    transition: border-color 0.2s;
}

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

.form-textarea {
    resize: vertical;
    font-family: inherit;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-section {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.form-section:last-child {
    border-bottom: none;
}

.form-section h3 {
    margin-bottom: 1rem;
    color: var(--text);
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.form-actions-inline {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

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

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

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

.btn-secondary:hover {
    background: #475569;
}

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

.btn-danger:hover {
    background: #dc2626;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

.btn-link {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
}

.btn-link:hover {
    text-decoration: underline;
}

/* Dashboard */
.dashboard h1 {
    font-size: 2rem;
    margin-bottom: 2rem;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.stat-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    text-align: center;
}

.stat-card h3 {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary);
}

.dashboard-section {
    margin-bottom: 3rem;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
}

.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.action-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    text-decoration: none;
    color: var(--text);
    transition: transform 0.2s, box-shadow 0.2s;
}

.action-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.action-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.action-card p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Accounts */
.accounts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 1.5rem;
}

.account-card {
    background: var(--surface);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s;
}

.account-card:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.account-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.account-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.account-email {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.account-details {
    margin-bottom: 1rem;
    padding: 1rem;
    background: var(--bg);
    border-radius: 0.5rem;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    padding: 0.25rem 0;
    font-size: 0.875rem;
}

.detail-label {
    font-weight: 500;
    color: var(--text-muted);
}

.account-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.sync-status {
    margin-top: 0.5rem;
    font-size: 0.875rem;
    color: var(--success);
}

/* Badges */
.badge {
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-secondary {
    background: #e2e8f0;
    color: #475569;
}

/* Inbox */
.inbox-layout {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 1.5rem;
}

.inbox-sidebar {
    background: var(--surface);
    border-radius: 0.75rem;
    padding: 1rem;
    box-shadow: var(--shadow);
    height: fit-content;
}

.folder-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.folder-item {
    padding: 0.75rem;
    border-radius: 0.5rem;
    color: var(--text);
    text-decoration: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.2s;
}

.folder-item:hover,
.folder-item.active {
    background: var(--bg);
}

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

.accounts-sidebar {
    margin-top: 2rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.accounts-sidebar h4 {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.account-item {
    display: block;
    padding: 0.5rem 0.75rem;
    color: var(--text);
    text-decoration: none;
    font-size: 0.875rem;
    border-radius: 0.375rem;
    transition: background 0.2s;
}

.account-item:hover {
    background: var(--bg);
}

.inbox-content {
    background: var(--surface);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.inbox-toolbar {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.search-input {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    width: 300px;
}

/* Message list */
.message-list {
    display: flex;
    flex-direction: column;
}

.message-item {
    display: grid;
    grid-template-columns: auto 200px 1fr 250px 120px;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    align-items: center;
    transition: background 0.2s;
}

.message-item:hover {
    background: var(--bg);
}

.message-item.unread {
    background: #f0f9ff;
    font-weight: 600;
}

.message-from {
    color: var(--text);
    font-size: 0.875rem;
}

.message-subject {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.subject-text {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-preview {
    color: var(--text-muted);
    font-size: 0.875rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.message-date {
    text-align: right;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.pagination {
    padding: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}

/* Message viewer */
.message-toolbar {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    background: var(--surface);
    border-radius: 0.75rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.toolbar-left,
.toolbar-right {
    display: flex;
    gap: 0.5rem;
}

.message-viewer {
    background: var(--surface);
    border-radius: 0.75rem;
    box-shadow: var(--shadow);
    overflow: hidden;
}

.message-header {
    padding: 2rem;
    border-bottom: 1px solid var(--border);
}

.message-subject {
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.message-meta {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.meta-row {
    display: grid;
    grid-template-columns: 80px 1fr;
    padding: 0.25rem 0;
}

.meta-label {
    font-weight: 600;
    color: var(--text);
}

.message-attachments {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border);
}

.message-attachments h4 {
    margin-bottom: 0.5rem;
}

.attachment-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.attachment-item {
    padding: 0.5rem 1rem;
    background: var(--bg);
    border-radius: 0.5rem;
    text-decoration: none;
    color: var(--text);
    font-size: 0.875rem;
    transition: background 0.2s;
}

.attachment-item:hover {
    background: #e2e8f0;
}

.message-body {
    padding: 2rem;
}

.message-html-frame {
    width: 100%;
    min-height: 400px;
    border: none;
}

.message-text {
    white-space: pre-wrap;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text);
}

/* Page header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.page-header h1 {
    font-size: 2rem;
}

/* Error message */
.error-message {
    color: var(--danger);
    background: #fee2e2;
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid var(--danger);
}

.error-message:empty {
    display: none;
}

/* Success message */
.success-message {
    color: #065f46;
    background: #d1fae5;
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    border: 1px solid #10b981;
}

.success-message:empty {
    display: none;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.modal-content {
    background: var(--surface);
    border-radius: 0.75rem;
    padding: 2rem;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    width: 2rem;
    height: 2rem;
}

/* Footer */
.footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 1.5rem 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
    .inbox-layout {
        grid-template-columns: 1fr;
    }

    .inbox-sidebar {
        display: none;
    }

    .message-item {
        grid-template-columns: 1fr;
    }

    .accounts-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}