:root {
    --bg-light: #f8fafc;
    --sidebar-white: #ffffff;
    --accent-blue: #3b82f6;
    --text-dark: #0f172a;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

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

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--sidebar-white);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 2rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 3rem;
}

.logo-icon {
    background: var(--accent-blue);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
}

.nav-menu {
    flex: 1;
}

.nav-item {
    padding: 12px 16px;
    border-radius: 12px;
    margin-bottom: 8px;
    cursor: pointer;
    color: var(--text-muted);
    transition: 0.2s;
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-item:hover, .nav-item.active {
    background: #eff6ff;
    color: var(--accent-blue);
    font-weight: 600;
}

/* Main Area */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem 3rem;
}

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 3rem;
}

.search-box input {
    background: white;
    border: 1px solid var(--border-color);
    padding: 10px 20px;
    border-radius: 30px;
    width: 300px;
    outline: none;
}

.welcome-banner {
    margin-bottom: 3rem;
}

.welcome-banner h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 8px;
}

/* The Grid */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    cursor: pointer;
    transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow);
}

.card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(59, 130, 246, 0.2);
}

.card h3 {
    font-weight: 700;
    color: var(--text-dark);
}