:root {
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --secondary: #10b981;
    --danger: #ef4444;
    --bg: #f3f4f6;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.5;
}

/* NAVIGATION */
.navbar {
    background: white;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.nav-logo {
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 500;
    transition: color 0.1s;
}

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

.nav-links a.nav-danger:hover,
.nav-links a.nav-danger.active {
    color: var(--danger);
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.page-header {
    text-align: center;
    margin-bottom: 2rem;
}

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* MENU GRID */
.grid-menu {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.menu-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    text-align: center;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.menu-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.menu-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.menu-card h3 {
    margin-bottom: 0.5rem;
    color: var(--primary);
}

.menu-card.danger h3 {
    color: var(--danger);
}

/* FORMS */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.form-group {
    margin-bottom: 1rem;
}

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

input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-weight: 500;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
    width: 100%;
}

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

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

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

.secondary:hover {
    background-color: #059669;
}

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

.danger:hover {
    background-color: #dc2626;
}

.danger-zone {
    border: 1px solid #fee2e2;
}

.search-box {
    display: flex;
    gap: 1rem;
}

.search-box input {
    flex: 1;
}

.search-box button {
    width: auto;
}

/* RESULTS */
.result-box {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 6px;
    border-left: 4px solid var(--primary);
    word-break: break-all;
    font-family: monospace;
    font-size: 0.9rem;
}

.result-box.hidden {
    display: none;
}

.status-valid {
    color: var(--secondary);
    font-weight: 700;
}

.status-invalid {
    color: var(--danger);
    font-weight: 700;
}