/* Global Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;

    --bg-color: #f5f5f5;
    --text-color: #212121;
    --h1-text-color: #333333;
    --info-text-color: #555;
    --border-color: #ddd;

    --header-color: white;
    --header-border-color: #e0e0e0;
    --primary-color: #667eea;
    --primary-hover-color: #94a3ef;
    --on-primary-text: #f2f2f2;
    --on-primary-effect: rgba(255, 255, 255, 0.9);
    --primary-highligh: rgba(255, 255, 255, 0.1);
    --secondary-color: #764ba2;

    --box-shadow: rgba(0, 0, 0, 0.1);

    --button-hover-color: #cccccc;
    --button-color: #ddd;

    --table-row-bg: #f5f5f5;
    --table-row-bg2: #f2f2f2;
    --table-hover-bg: #ddd;
    --table-border: #ddd;
}

html, body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    height: 100%;
}

body {
    background: var(--bg-color);
}

/* Page Layout */
.page {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 250px;
    background: linear-gradient(180deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    box-shadow: 2px 0 10px var(--box-shadow);
}

main {
    flex: 1;
    flex-direction: column;
    overflow: auto;
}

.top-row {
    height: 60px;
    display: flex;
    align-items: center;
    background: var(--header-color);
    border-bottom: 2px solid var(--header-border-color);
    box-shadow: 0 2px 4px var(--box-shadow);
}

.app-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-left: 1.5rem;
}

.content {
    flex: 1;
    padding: 2rem;
}

/* Navigation Menu */
.nav-menu {
    padding: 2rem 0;
}

.nav-menu nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-item {
    padding: 0 1rem;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: var(--on-primary-effect);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s;
    font-size: 1rem;
}

.nav-link:hover {
    background: var(--primary-highligh);
    color: var(--on-primary-effect);
}

.nav-link.active {
    background: var(--primary-highligh);
    color: var(--on-primary-effect);
    font-weight: 600;
}

.nav-icon {
    margin-right: 0.75rem;
    font-size: 1.2rem;
}

/* Page Content */

h1 {
    font-size: 2.5rem;
    color: var(--h1-text-color);
    margin-bottom: 0.5rem;
}

.info-card {
    background: var(--header-color);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px var(--box-shadow);
    margin-bottom: 1.5rem;
}

.info-card h2 {
    color: var(--primary-color);
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.info-card p {
    color: var(--info-text-color);
    line-height: 1.6;
    margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .page {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
    }

    .nav-menu nav {
        flex-direction: row;
        overflow-x: auto;
    }

    .content {
        padding: 1rem;
    }

    h1 {
        font-size: 2rem;
    }
}