/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #0ea5e9;
    --success: #22c55e;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #3b82f6;
    --dark: #1e293b;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --white: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
}

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

/* Header */
.header {
    background: var(--white);
    padding: 15px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 1.8rem;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav a {
    text-decoration: none;
    color: var(--gray-600);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    padding: 80px 0;
    text-align: center;
    color: var(--white);
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 40px;
}

/* Search Box */
.search-box {
    max-width: 700px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    background: var(--white);
    border-radius: 50px;
    padding: 8px;
    box-shadow: var(--shadow-lg);
}

.input-group i {
    display: flex;
    align-items: center;
    padding: 0 15px;
    color: var(--gray-400);
}

.input-group input {
    flex: 1;
    border: none;
    font-size: 1rem;
    padding: 15px 10px;
    outline: none;
    min-width: 0;
}

.input-group button {
    background: var(--primary);
    color: var(--white);
    border: none;
    padding: 15px 35px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.input-group button:hover {
    background: var(--primary-dark);
}

/* Loading Section */
.loading-section {
    padding: 80px 0;
    text-align: center;
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.loader-spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loader p {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--gray-700);
}

.loader-subtitle {
    font-size: 0.9rem !important;
    font-weight: 400 !important;
    color: var(--gray-500) !important;
}

/* Results Section */
.results-section {
    padding: 40px 0 80px;
}

/* Score Overview */
.score-overview {
    display: flex;
    align-items: center;
    gap: 30px;
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.score-circle {
    position: relative;
    width: 140px;
    height: 140px;
}

.score-circle svg {
    transform: rotate(-90deg);
}

.score-bg {
    fill: none;
    stroke: var(--gray-200);
    stroke-width: 8;
}

.score-progress {
    fill: none;
    stroke: var(--success);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 283;
    stroke-dashoffset: 283;
    transition: stroke-dashoffset 1s ease-out;
}

.score-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-800);
}

.score-info h2 {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.score-info p {
    color: var(--gray-500);
    word-break: break-all;
    margin-bottom: 10px;
}

.score-meta {
    display: flex;
    gap: 20px;
    color: var(--gray-500);
    font-size: 0.9rem;
}

.score-meta i {
    margin-right: 5px;
}

/* Quick Stats */
.quick-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--white);
    padding: 20px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-card i {
    font-size: 2rem;
    margin-bottom: 10px;
}

.stat-card .stat-value {
    font-size: 1.8rem;
    font-weight: 700;
}

.stat-card .stat-label {
    color: var(--gray-500);
    font-size: 0.9rem;
}

#statErrors i, #statErrors .stat-value { color: var(--danger); }
#statWarnings i, #statWarnings .stat-value { color: var(--warning); }
#statPassed i, #statPassed .stat-value { color: var(--success); }
#statInfo i, #statInfo .stat-value { color: var(--info); }

/* Analysis Tabs */
.analysis-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 20px;
    background: var(--white);
    padding: 15px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tab-btn:hover {
    background: var(--gray-200);
}

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

/* Tab Contents */
.tab-contents {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

.tab-content h3 {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--gray-200);
}

/* Analysis Grid */
.analysis-grid {
    display: grid;
    gap: 15px;
}

.analysis-item {
    display: flex;
    flex-direction: column;
    padding: 15px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--gray-300);
}

.analysis-item.good { border-left-color: var(--success); }
.analysis-item.warning { border-left-color: var(--warning); }
.analysis-item.error, .analysis-item.missing { border-left-color: var(--danger); }
.analysis-item.info { border-left-color: var(--info); }

.analysis-item .label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--gray-600);
    margin-bottom: 5px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.analysis-item .value {
    color: var(--gray-800);
    word-break: break-all;
}

.analysis-item .meta {
    font-size: 0.8rem;
    color: var(--gray-500);
    margin-top: 5px;
}

/* Status Badge */
.status-badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
}

.status-badge.good { background: #dcfce7; color: #166534; }
.status-badge.warning { background: #fef3c7; color: #92400e; }
.status-badge.error { background: #fee2e2; color: #991b1b; }
.status-badge.info { background: #dbeafe; color: #1e40af; }

/* Headings Structure */
.heading-tree {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.heading-item {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
}

.heading-item .level {
    background: var(--primary);
    color: var(--white);
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-right: 15px;
    min-width: 35px;
    text-align: center;
}

.heading-item .text {
    color: var(--gray-700);
}

/* Social Grids */
.social-grids {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.social-section h4 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--gray-200);
}

.social-preview {
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    padding: 15px;
    margin-bottom: 15px;
}

.social-preview img {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
}

.social-preview h5 {
    font-size: 1rem;
    margin-bottom: 5px;
}

.social-preview p {
    font-size: 0.85rem;
    color: var(--gray-600);
}

/* Schema Section */
.schema-item {
    background: var(--gray-100);
    padding: 15px;
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
}

.schema-item .type {
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 10px;
}

.schema-code {
    background: var(--gray-800);
    color: var(--gray-100);
    padding: 15px;
    border-radius: var(--radius-sm);
    font-family: monospace;
    font-size: 0.85rem;
    overflow-x: auto;
    max-height: 200px;
}

/* Links Section */
.links-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.link-stat {
    background: var(--gray-100);
    padding: 15px;
    border-radius: var(--radius-sm);
    text-align: center;
}

.link-stat .number {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.link-stat .label {
    font-size: 0.85rem;
    color: var(--gray-600);
}

/* Images Section */
.images-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

/* Issues List */
.issues-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.issue-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 15px;
    border-radius: var(--radius-sm);
}

.issue-item.error { background: #fee2e2; }
.issue-item.warning { background: #fef3c7; }
.issue-item.info { background: #dbeafe; }

.issue-item i {
    margin-top: 2px;
}

.issue-item.error i { color: var(--danger); }
.issue-item.warning i { color: var(--warning); }
.issue-item.info i { color: var(--info); }

/* Recommendations */
.recommendations-section {
    background: var(--white);
    padding: 30px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.recommendations-section h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    color: var(--primary);
}

.recommendation-group {
    margin-bottom: 25px;
}

.recommendation-group h4 {
    font-size: 0.9rem;
    color: var(--gray-600);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.recommendation-item {
    display: flex;
    gap: 15px;
    padding: 15px;
    background: var(--gray-100);
    border-radius: var(--radius-sm);
    margin-bottom: 10px;
}

.recommendation-item.high { border-left: 4px solid var(--danger); }
.recommendation-item.medium { border-left: 4px solid var(--warning); }
.recommendation-item.low { border-left: 4px solid var(--info); }

.recommendation-item .category {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.9rem;
}

.recommendation-item .issue {
    color: var(--gray-800);
    margin: 5px 0;
}

.recommendation-item .fix {
    font-size: 0.85rem;
    color: var(--gray-600);
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: var(--white);
}

.features-section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 25px;
}

.feature-card {
    background: var(--gray-100);
    padding: 25px;
    border-radius: var(--radius);
    text-align: center;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.feature-card h4 {
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--gray-600);
}

/* Footer */
.footer {
    background: var(--gray-800);
    color: var(--gray-400);
    padding: 30px 0;
    text-align: center;
}

/* Responsive */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }
    
    .input-group {
        flex-direction: column;
        border-radius: var(--radius);
        padding: 15px;
    }
    
    .input-group i {
        display: none;
    }
    
    .input-group input {
        text-align: center;
        margin-bottom: 10px;
    }
    
    .input-group button {
        width: 100%;
    }
    
    .score-overview {
        flex-direction: column;
        text-align: center;
    }
    
    .quick-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .social-grids {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .links-summary,
    .images-summary {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .quick-stats {
        grid-template-columns: 1fr;
    }
    
    .analysis-tabs {
        flex-direction: column;
    }
    
    .tab-btn {
        justify-content: center;
    }
}