:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --bg-dark: #0f172a;
    --bg-light: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --error-color: #ef4444;
    --success-color: #22c55e;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

/* Login Screen */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background: linear-gradient(135deg, var(--bg-dark) 0%, var(--bg-light) 100%);
}

.login-box {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    width: 400px;
    border: 1px solid var(--border-color);
}

.logo-container {
    text-align: center;
    margin-bottom: 2rem;
}

.logo-container h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.logo-container p {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

#loginForm {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#passwordInput {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    padding: 0.875rem 1rem;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s;
}

#passwordInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

button[type="submit"] {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    padding: 0.875rem;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: transform 0.2s;
}

button[type="submit"]:hover {
    transform: translateY(-2px);
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    text-align: center;
    margin-top: 0.5rem;
    min-height: 20px;
}

/* Main Application */
.main-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-card);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 2rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h2 {
    font-size: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.version {
    background: var(--bg-dark);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.nav-menu {
    list-style: none;
    padding: 1rem;
    flex: 1;
}

.nav-section {
    color: var(--text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: 1.5rem 0 0.75rem;
    padding: 0 1rem;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    margin-bottom: 0.25rem;
}

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

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

.nav-link .icon {
    font-size: 1.25rem;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.logout-btn {
    width: 100%;
    padding: 0.75rem;
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
}

.logout-btn:hover {
    background: var(--error-color);
    color: white;
    border-color: var(--error-color);
}

/* Content Area */
.content-area {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-dark);
}

#content-container {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

/* Dashboard Styles */
.dashboard-header {
    margin-bottom: 2rem;
}

.dashboard-header h1 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.dashboard-header p {
    color: var(--text-secondary);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.metric-card {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.metric-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.metric-value {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.metric-change {
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.metric-change.positive {
    color: var(--success-color);
}

.metric-change.negative {
    color: var(--error-color);
}

.chart-container {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

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

.chart-header h2 {
    font-size: 1.25rem;
}

.chart-placeholder {
    height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border-radius: 8px;
    color: var(--text-secondary);
}

/* Document Content Styles */
.document-content {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    max-width: 1000px;
    margin: 0 auto;
}

.document-content h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.document-content h2 {
    font-size: 1.875rem;
    margin: 2rem 0 1rem;
    color: var(--text-primary);
}

.document-content h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: var(--text-primary);
}

.document-content p {
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.document-content ul, .document-content ol {
    margin: 1rem 0 1rem 2rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.document-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding-left: 1.5rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        display: none;
    }
    
    .content-area {
        padding: 1rem;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
    }
}