:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --sidebar-bg: #0f172a;
    --sidebar-text: #f8fafc;
    --sidebar-hover: #1e293b;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background: var(--bg-card);
    padding: 0.75rem 2rem;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: 0 1px 2px 0 rgb(0 0 0 / 0.05);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.navbar-left {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.hamburger {
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-main);
    display: none;
}

.navbar h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: -0.025em;
}

.navbar-right {
    display: flex;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
    padding: 0.5rem 0.75rem;
    background: var(--bg-main);
    border-radius: 2rem;
}

main {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: var(--sidebar-text);
    padding: 1.5rem 0.75rem;
    display: flex;
    flex-direction: column;
    height: calc(100vh - 64px);
    position: sticky;
    top: 64px;
}

.sidebar ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.sidebar li {
    margin-bottom: 0.25rem;
}

.sidebar a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--sidebar-text);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: all 0.2s;
    font-size: 0.9375rem;
    opacity: 0.8;
}

.sidebar a:hover {
    background-color: var(--sidebar-hover);
    opacity: 1;
}

.sidebar a.active {
    background-color: var(--primary);
    opacity: 1;
    font-weight: 500;
}

.sidebar i {
    font-size: 1.25rem;
}

.logout-link {
    margin-top: auto;
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1rem;
}

.content {
    flex: 1;
    padding: 2rem;
    background: var(--bg-main);
}

.container {
    max-width: 1000px;
    margin: 0 auto;
}

footer {
    background: var(--bg-card);
    padding: 1rem 2rem;
    border-top: 1px solid var(--border);
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-sep {
    margin: 0 0.5rem;
    color: var(--border);
}

.card {
    background: var(--bg-card);
    border-radius: 0.75rem;
    padding: 1.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

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

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

input, textarea, select {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border);
    border-radius: 0.5rem;
    font-family: inherit;
    transition: border-color 0.2s, ring 0.2s;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1.25rem;
    font-weight: 600;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    gap: 0.5rem;
}

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

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

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 0.75rem 1rem;
    background: var(--bg-main);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    font-size: 0.875rem;
}

tr:hover td {
    background-color: var(--bg-main);
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -260px;
        height: 100%;
        z-index: 100;
    }
    .sidebar.show {
        transform: translateX(260px);
    }
}