:root {
    --primary: #6c5ce7;
    --primary-dark: #5a4bd1;
    --secondary: #00b894;
    --danger: #e17055;
    --warning: #fdcb6e;
    --dark: #2d3436;
    --light: #f8f9fa;
    --gray: #636e72;
    --border: #dfe6e9;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--dark);
    background: var(--light);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.hidden {
    display: none !important;
}

.navbar {
    background: white;
    box-shadow: var(--shadow);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

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

.nav-link {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s;
    font-size: 1rem;
}

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

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

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

.btn-danger:hover {
    background: #d63031;
}

.btn-logout {
    color: var(--danger);
}

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

.loading {
    text-align: center;
    padding: 2rem;
    color: var(--gray);
}

.error-message {
    background: #ffeaa7;
    color: #d63031;
    padding: 1rem;
    border-radius: var(--radius);
    margin: 1rem 0;
}

.success-message {
    background: #d4edda;
    color: #155724;
    padding: 1rem;
    border-radius: var(--radius);
    margin: 1rem 0;
}