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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    overflow: hidden;
}

header {
    background: #2c3e50;
    color: white;
    padding: 20px 30px;
}

header h1 {
    font-size: 24px;
    margin-bottom: 15px;
}

nav {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

nav a {
    color: white;
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    background: rgba(255,255,255,0.1);
    transition: background 0.3s;
}

nav a:hover {
    background: rgba(255,255,255,0.2);
}

nav a.active {
    background: #3498db;
}

nav a.logout {
    margin-left: auto;
    background: #e74c3c;
}

nav a.logout:hover {
    background: #c0392b;
}

main {
    padding: 30px;
    min-height: 400px;
}

footer {
    background: #ecf0f1;
    padding: 15px 30px;
    text-align: center;
    color: #7f8c8d;
    font-size: 14px;
}

/* Login page */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 500px;
}

.login-box {
    background: #f8f9fa;
    padding: 40px;
    border-radius: 10px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #2c3e50;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #2c3e50;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus {
    outline: none;
    border-color: #3498db;
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 5px;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.error {
    background: #fee;
    color: #c00;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 20px;
    border-left: 4px solid #c00;
}

/* Page content */
.page-content h2 {
    color: #2c3e50;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #3498db;
}

.content-box {
    background: #f8f9fa;
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid #3498db;
}

.content-box p {
    line-height: 1.6;
    color: #555;
}

.welcome-text {
    font-size: 18px;
    line-height: 1.8;
}

.welcome-text strong {
    color: #2c3e50;
}

/* Message form */
.message-form {
    max-width: 600px;
}

.message-form .form-group {
    margin-bottom: 25px;
}

.message-form label {
    display: block;
    margin-bottom: 8px;
    color: #2c3e50;
    font-weight: 600;
}

.message-form input[type="text"],
.message-form select,
.message-form textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e0e0e0;
    border-radius: 5px;
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.3s;
}

.message-form input[type="text"]:focus,
.message-form select:focus,
.message-form textarea:focus {
    outline: none;
    border-color: #3498db;
}

.message-form small {
    display: block;
    margin-top: 5px;
    color: #7f8c8d;
    font-size: 13px;
}

.form-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.form-actions .btn {
    flex: 1;
    max-width: 200px;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Result boxes */
.result-box {
    margin-top: 25px;
    padding: 20px;
    border-radius: 8px;
    border-left: 4px solid;
}

.result-box.info {
    background: #e8f4f8;
    border-color: #3498db;
}

.result-box.success {
    background: #d4edda;
    border-color: #28a745;
}

.result-box.error {
    background: #f8d7da;
    border-color: #dc3545;
}

.result-box p {
    margin: 5px 0;
}