:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #e0e7ff;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --danger-color: #ef4444;
    --success-color: #10b981;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-dark);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    background-color: var(--card-bg);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    padding: 1rem 0;
}

header nav {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-links a {
    margin-left: 1.5rem;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary-color);
}

main {
    flex: 1;
    width: 90%;
    max-width: 1200px;
    margin: 2rem auto;
}

.container {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 0.75rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

h1,
h2,
h3 {
    color: var(--text-dark);
}

button,
.btn {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    text-decoration: none;
    font-size: 1rem;
}

button:hover,
.btn:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

button:active,
.btn:active {
    transform: translateY(0);
}

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

.btn-secondary:hover {
    background-color: #c7d2fe;
}

input[type="text"],
input[type="number"],
input[type="password"],
input[type="email"],
select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    box-sizing: border-box;
    /* Important for padding */
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--secondary-color);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden;
}

th,
td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    background-color: #f9fafb;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    color: var(--text-light);
    letter-spacing: 0.05em;
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background-color: #f9fafb;
}

footer {
    text-align: center;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    color: var(--text-light);
    margin-top: auto;
}