/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

/* Container */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.logo {
    font-size: 2rem;
    font-weight: bold;
    color: white;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.back-link {
    position: absolute;
    left: 0;
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.back-link:hover {
    color: #f0f0f0;
}

/* Main content */
main {
    padding: 2rem 0;
}

.content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 15px;
    padding: 3rem;
    margin: 2rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

/* Typography */
h1 {
    color: #2c3e50;
    margin-bottom: 1rem;
    font-size: 2.5rem;
}

h2 {
    color: #34495e;
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

h3 {
    color: #34495e;
    margin-top: 1.5rem;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

p {
    margin-bottom: 1rem;
    color: #5a6c7d;
    line-height: 1.8;
}

ul, ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
    color: #5a6c7d;
    line-height: 1.6;
}

/* Status indicators */
.status {
    padding: 1rem;
    border-radius: 10px;
    margin: 1rem 0;
    font-weight: 500;
}

.connected {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.disconnected {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.warning {
    background: #fff3cd;
    color: #856404;
    border: 1px solid #ffeaa7;
    margin: 2rem 0;
    text-align: left;
}

/* Messages */
.message {
    margin: 1rem 0;
    padding: 1rem;
    border-radius: 10px;
    display: none;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    margin: 1rem;
    border: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.btn-primary {
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
}

.btn-secondary {
    background: linear-gradient(45deg, #95a5a6, #7f8c8d);
    color: white;
}

.btn-danger {
    background: linear-gradient(45deg, #e74c3c, #c0392b);
    color: white;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* Loading spinner */
.loading {
    display: none;
    margin: 1rem 0;
}

.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid #667eea;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 0 auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Error pages specific styles */
.error-page {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}

.error-content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 3rem 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    text-align: center;
}

.error-code {
    font-size: 6rem;
    font-weight: bold;
    color: #e74c3c;
    margin-bottom: 1rem;
}

.error-page .container {
    max-width: 600px;
}

.error-page .logo {
    font-size: 1.5rem;
    margin-bottom: 2rem;
}

.error-page p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* Text center utility */
.text-center {
    text-align: center;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .content {
        padding: 2rem;
        margin: 1rem 0;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .error-code {
        font-size: 4rem;
    }

    .error-page h1 {
        font-size: 1.5rem;
    }

    .error-content {
        padding: 2rem 1rem;
    }

    .btn {
        display: block;
        margin: 1rem 0;
    }
}

@media (max-width: 480px) {
    .content {
        padding: 1.5rem;
    }

    h1 {
        font-size: 1.8rem;
    }

    .btn {
        font-size: 0.9rem;
        padding: 0.8rem 1.5rem;
    }
}