/* CSS chính cho unlocked.vn */
/* File: assets/css/style.css */

/* Reset và 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-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.nav-section {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    color: white;
}

.welcome-text {
    font-size: 0.9rem;
    opacity: 0.9;
}

.credit-display {
    background: rgba(255,255,255,0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.9rem;
    font-weight: 600;
}

.logout-link {
    color: white;
    text-decoration: none;
    padding: 0.25rem 0.5rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.logout-link:hover {
    background: rgba(255,255,255,0.2);
    color: white;
}

.logout-message {
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    text-align: center;
    font-size: 1rem;
    backdrop-filter: blur(10px);
}

.logo h1 {
    font-size: 1.8rem;
    margin-bottom: 0.2rem;
}

.logo p {
    font-size: 0.9rem;
    opacity: 0.9;
}

.nav {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    background-color: rgba(255,255,255,0.2);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 4rem 0;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content > p {
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.95;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Form Styles */
.check-form {
    background: rgba(255,255,255,0.1);
    padding: 2rem;
    border-radius: 15px;
    backdrop-filter: blur(10px);
    max-width: 600px;
    margin: 0 auto 2rem;
    box-shadow: 0 8px 32px rgba(0,0,0,0.1);
}

.form-group {
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    font-size: 1.1rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

#imei-input {
    flex: 1;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    background: rgba(255,255,255,0.95);
    color: #333;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

#imei-input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
}

.btn-primary {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.3);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: #6c757d;
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.btn-secondary:hover {
    background: #5a6268;
}

.help-text {
    color: rgba(255,255,255,0.8);
    font-size: 0.9rem;
}

/* Loading Styles */
.loading {
    text-align: center;
    padding: 2rem;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255,255,255,0.3);
    border-top: 4px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

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

/* Result Section */
.result-section {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 1000px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    color: #333;
}

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

.result-header h3 {
    color: #28a745;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.result-meta {
    display: flex;
    justify-content: center;
    gap: 2rem;
    font-size: 0.9rem;
    color: #666;
}

.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.result-card {
    background: #f8f9fa;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    border: 1px solid #e9ecef;
}

.card-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header h4 {
    margin: 0;
    font-size: 1.1rem;
}

.card-content {
    padding: 1.5rem;
}

.info-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 0;
    border-bottom: 1px solid #e9ecef;
}

.info-item:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 600;
    color: #495057;
}

.info-value {
    font-weight: 500;
    color: #212529;
}

.status-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.status-success {
    background: #d4edda;
    color: #155724;
}

.status-warning {
    background: #fff3cd;
    color: #856404;
}

.status-danger {
    background: #f8d7da;
    color: #721c24;
}

.status-info {
    background: #d1ecf1;
    color: #0c5460;
}

/* Demo Notice */
.demo-notice {
    background: #fff3cd;
    color: #856404;
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    text-align: center;
    border: 1px solid #ffeaa7;
}

/* Error Section */
.error-section {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    margin: 2rem auto;
    max-width: 600px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    text-align: center;
}

.error-content {
    color: #dc3545;
}

.error-content i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.error-content h4 {
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.error-content p {
    margin-bottom: 1.5rem;
    color: #666;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background: white;
}

.features h2 {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.2rem;
    color: #333;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
    border-radius: 10px;
    background: #f8f9fa;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 3rem;
    color: #667eea;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: #333;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
    color: #ecf0f1;
}

.footer-section p {
    margin-bottom: 0.5rem;
    color: #bdc3c7;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #ecf0f1;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #34495e;
    color: #bdc3c7;
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }

/* Responsive Design */
@media (max-width: 768px) {
    .hero-content h2 {
        font-size: 2rem;
    }
    
    .hero-content > p {
        font-size: 1rem;
    }
    
    .input-group {
        flex-direction: column;
    }
    
    .btn-primary {
        width: 100%;
    }
    
    .result-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .header-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .nav-section {
        flex-direction: column;
        gap: 1rem;
    }
    
    .user-info {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav {
        justify-content: center;
    }
    
    .check-form {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .result-section,
    .check-form {
        margin: 1rem auto;
        padding: 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
}