style.css

:root {
    /* Existing light theme variables */
    --primary: #2563eb;
    --primary-light: #eff6ff;
    --success: #10b981;
    --warning: #f59e0b;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --sidebar-width: 280px;
    --header-height: 60px;
    --transition-speed: 0.3s;

    /* Add theme variables */
    --bg-primary: white;
    --bg-secondary: white;
    --text-primary: var(--gray-700);
    --text-secondary: var(--gray-600);
    --border-color: var(--gray-200);
}

/* Dark theme variables */
[data-theme="dark"] {
    --bg-primary: #333334;
    --bg-secondary: #1f2937;
    --text-primary: #e0e0e0;
    --text-secondary: #9ca3af;
    --border-color: #374151;
}

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

/* Apply theme variables */
body {
    background: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color var(--transition-speed), color var(--transition-speed);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    overflow-x: hidden;
}

.app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.app-sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
}

.nav-title {
    color: var(--text-secondary);
}

.nav-link {
    color: var(--text-primary);
}

[data-theme="dark"] .nav-link {
    color: var(--text-primary);
}

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

[data-theme="dark"] .nav-link:hover {
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    background: var(--primary-light);
    color: var(--primary);
}

[data-theme="dark"] .nav-link.active {
    background: rgba(37, 99, 235, 0.2);
    color: #60a5fa;
}

.user-avatar {
    background: var(--primary-light);
    color: var(--primary);
}

[data-theme="dark"] .user-avatar {
    background: rgba(37, 99, 235, 0.2);
    color: #60a5fa;
}

.content-frame {
    background: var(--bg-primary);
}

.frame-error {
    background: var(--bg-primary);
}

.frame-error h2 {
    color: var(--text-primary);
}

.frame-error p {
    color: var(--text-secondary);
}

button.icon-button {
    color: var(--text-primary);
    background-color: var(--bg-primary);
    border: 0;
}

button.icon-button:hover {
    background-color: var(--bg-secondary);
}

/* Theme toggle specific styles */
.hidden {
    display: none;
}

#themeToggle {
    padding: 0.5rem;
    border-radius: 0.375rem;
    cursor: pointer;
    background: none;
    border: none;
    color: var(--text-primary);
}

#themeToggle:hover {
    background: var(--gray-100);
}

[data-theme="dark"] #themeToggle:hover {
    background: rgba(255, 255, 255, 0.05);
}

/* Header Styles */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-primary);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    z-index: 40;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.menu-trigger {
    display: none;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--gray-600);
}

.user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-weight: 500;
}

/* Sidebar Styles */
.app-sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-primary);
    border-right: 1px solid var(--gray-200);
    overflow-y: auto;
    transition: transform var(--transition-speed) ease;
    z-index: 30;
}

.nav-section {
    padding: 1rem;
}

.nav-title {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-text);
    padding: 0.5rem 1rem;
    margin-bottom: 0.5rem;
}

.nav-menu {
    list-style: none;
}

.nav-item {
    margin-bottom: 0.25rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--primary-text);
    text-decoration: none;
    border-radius: 6px;
    transition: background-color 0.2s ease;
}
[data-theme="dark"] .nav-link {
}

.nav-link:hover {
    background: var(--gray-50);
}

.nav-link.active {
    background: var(--primary-light);
    color: var(--primary);
    font-weight: 500;
}

/* Main Content Area */
.app-main {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    height: calc(100vh - var(--header-height));
    transition: margin-left var(--transition-speed) ease;
    padding: 0; /* Remove padding for iframe */
    position: relative;
    overflow: hidden;
}

.content-frame {
    width: 100%;
    height: 100%;
    border: none;
    background: white;
}

/* Ensure iframe adjusts on mobile */
@media (max-width: 768px) {
    .app-main {
        margin-left: 0;
        width: 100%;
    }
}

/* Loading indicator for iframe */
.frame-loader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gray-200);
    overflow: hidden;
    display: none;
}

.frame-loader::after {
    content: '';
    position: absolute;
    left: -50%;
    width: 50%;
    height: 100%;
    background: var(--primary);
    animation: loading 1s infinite ease;
}

.frame-loader.active {
    display: block;
}

@keyframes loading {
    0% { transform: translateX(0); }
    100% { transform: translateX(200%); }
}

/* Error state for iframe */
.frame-error {
    position: absolute;
    inset: 0;
    display: none;
    align-items: center;
    justify-content: center;
    background: var(--gray-50);
    padding: 2rem;
    text-align: center;
}

.frame-error.active {
    display: flex;
}

.frame-error-content {
    max-width: 400px;
}

.frame-error h2 {
    color: var(--gray-800);
    margin-bottom: 0.5rem;
}

.frame-error p {
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.retry-button {
    padding: 0.5rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
}

.retry-button:hover {
    background: var(--primary-dark);
}

/* Mobile Styles */
@media (max-width: 768px) {
    .menu-trigger {
        display: block;
    }

    .app-sidebar {
        transform: translateX(-100%);
    }

    .app-sidebar.active {
        transform: translateX(0);
    }

    .app-main {
        margin-left: 0;
        padding: 1rem;
    }

    .overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 20;
    }

    .overlay.active {
        display: block;
    }
}