:root {
    --primary-color: #2563eb;
    --secondary-color: #4f46e5;
    --error-color: #dc2626;
    --success-color: #16a34a;
    --background: #f8fafc;
    --text-color: #1e293b;
    --border-color: #cbd5e1;
}

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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: var(--background);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.main-nav {
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

.brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

.auth-container {
    max-width: 480px;
    margin: 2rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s ease;
}

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

.password-rules {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.5rem;
    margin-top: 0.5rem;
    font-size: 0.875rem;
}

.password-rules span {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.password-rules .valid {
    color: var(--success-color);
}

.password-rules .invalid {
    color: var(--error-color);
}

.user-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 1rem;
}

.user-table th,
.user-table td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.user-table th {
    background: var(--background);
}

.error-container {
    text-align: center;
    padding: 4rem 0;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert.error {
    background: #fee2e2;
    color: var(--error-color);
}
/* Hero Section */
.hero-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: center;
    padding: 4rem 0;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.hero-text {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    color: #64748b;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    text-decoration: none;
    transition: background 0.3s;
}

.btn-secondary {
    background: var(--background);
    color: var(--primary-color);
    padding: 0.75rem 1.5rem;
    border: 2px solid var(--primary-color);
    border-radius: 6px;
    text-decoration: none;
    transition: all 0.3s;
}

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

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

.hero-image img {
    max-width: 100%;
    height: auto;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: 4rem 0;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-card p {
    color: #64748b;
}

/* Footer */
.main-footer {
    background: white;
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: auto;
}

.footer-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}

.footer-links a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s;
}

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