:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #059669;
    --success-light: #d1fae5;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --info: #0891b2;
    --info-light: #cffafe;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.02);
    --radius: 12px;
    --radius-sm: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    background: var(--gray-50);
    color: var(--gray-800);
    line-height: 1.6;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--gray-900) 0%, #1e3a5f 100%);
    padding: 20px 0;
    border-bottom: 3px solid var(--primary);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.header-logo {
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
    font-weight: 800;
    flex-shrink: 0;
}

.header-title {
    color: white;
    font-size: 20px;
    font-weight: 700;
    letter-spacing: -0.3px;
}

.header-logo,
.header-title {
    text-decoration: none;
    cursor: pointer;
}

.header-logo:hover,
.header-title:hover {
    opacity: 0.85;
}

.header-subtitle {
    color: var(--gray-400);
    font-size: 13px;
    margin-left: auto;
}

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 32px 24px;
}

/* Hero / Search Section */
.hero {
    text-align: center;
    margin-bottom: 40px;
    padding: 48px 24px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
}

.hero.hidden {
    display: none;
}

.hero-title {
    font-size: 28px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.hero-desc {
    color: var(--gray-500);
    font-size: 15px;
    margin-bottom: 32px;
}

.search-form {
    display: flex;
    gap: 12px;
    max-width: 680px;
    margin: 0 auto;
    flex-wrap: wrap;
    justify-content: center;
}

.search-input-wrapper {
    flex: 1;
    min-width: 300px;
    position: relative;
}

.search-input-wrapper .icon {
    position: absolute;
    left: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    font-size: 18px;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 14px 16px 14px 46px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 15px;
    outline: none;
    transition: all 0.2s;
    background: var(--gray-50);
}

.search-input:focus {
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px var(--primary-light);
}

.search-btn {
    padding: 14px 32px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    white-space: nowrap;
}

.search-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

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

/* Loading */
.loading-section {
    display: none;
    text-align: center;
    padding: 48px 24px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    margin-bottom: 40px;
}

.loading-section.active {
    display: block;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 24px;
}

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

.loading-text {
    color: var(--gray-600);
    font-size: 15px;
    margin-bottom: 20px;
}

.loading-steps {
    max-width: 400px;
    margin: 0 auto;
    text-align: left;
}

.loading-step {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 13px;
    color: var(--gray-400);
    transition: all 0.3s;
}

.loading-step.active {
    color: var(--primary);
    background: var(--primary-light);
    font-weight: 500;
}

.loading-step.done {
    color: var(--success);
}

.loading-step .step-icon {
    width: 20px;
    text-align: center;
    font-size: 14px;
}

.loading-step.done .step-icon {
    color: var(--success);
}

/* Results */
.results {
    display: none;
}

.results.active {
    display: block;
}

/* Score Card */
.score-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--gray-200);
    padding: 32px;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
}

.score-gauge {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    flex-shrink: 0;
    position: relative;
}

.score-gauge-inner {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: 1;
}

.score-number {
    font-size: 36px;
    font-weight: 800;
    line-height: 1;
}

.score-label {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 4px;
}

.score-gauge.excellent { background: conic-gradient(var(--success) 0deg 360deg); }
.score-gauge.good { background: conic-gradient(var(--primary) 0deg 270deg, var(--gray-200) 270deg); }
.score-gauge.fair { background: conic-gradient(var(--warning) 0deg 180deg, var(--gray-200) 180deg); }
.score-gauge.poor { background: conic-gradient(var(--danger) 0deg 90deg, var(--gray-200) 90deg); }

.score-gauge .score-number { color: var(--gray-900); }
.score-gauge .score-label { color: var(--gray-500); }

.score-info {
    flex: 1;
    min-width: 200px;
}

.score-info h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.score-info .url-display {
    color: var(--primary);
    font-size: 14px;
    word-break: break-all;
    margin-bottom: 8px;
}

.score-info .url-display a {
    color: var(--primary);
    text-decoration: none;
}

.score-info .url-display a:hover {
    text-decoration: underline;
}

.score-meta {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 12px;
}

.score-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--gray-500);
}

.score-meta-item strong {
    color: var(--gray-700);
}

.score-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
}

.score-badge.excellent { background: var(--success-light); color: var(--success); }
.score-badge.good { background: var(--primary-light); color: var(--primary); }
.score-badge.fair { background: var(--warning-light); color: var(--warning); }
.score-badge.poor { background: var(--danger-light); color: var(--danger); }

/* URL validation message */
.url-msg {
    display: none;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    margin-top: 16px;
}

.url-msg.active {
    display: block;
}

.url-msg.error {
    background: var(--danger-light);
    color: var(--danger);
    border: 1px solid #fecaca;
}

.url-msg.success {
    background: var(--success-light);
    color: var(--success);
    border: 1px solid #bbf7d0;
}

/* Category Cards */
.category-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    margin-bottom: 16px;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.5s ease forwards;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.category-card:nth-child(1) { animation-delay: 0.1s; }
.category-card:nth-child(2) { animation-delay: 0.2s; }
.category-card:nth-child(3) { animation-delay: 0.3s; }
.category-card:nth-child(4) { animation-delay: 0.4s; }
.category-card:nth-child(5) { animation-delay: 0.5s; }
.category-card:nth-child(6) { animation-delay: 0.6s; }
.category-card:nth-child(7) { animation-delay: 0.7s; }
.category-card:nth-child(8) { animation-delay: 0.8s; }
.category-card:nth-child(9) { animation-delay: 0.9s; }
.category-card:nth-child(10) { animation-delay: 1.0s; }
.category-card:nth-child(11) { animation-delay: 1.1s; }

.category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    cursor: pointer;
    transition: background 0.2s;
    user-select: none;
}

.category-header:hover {
    background: var(--gray-50);
}

.category-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.category-icon.success { background: var(--success-light); color: var(--success); }
.category-icon.warning { background: var(--warning-light); color: var(--warning); }
.category-icon.error { background: var(--danger-light); color: var(--danger); }
.category-icon.info { background: var(--info-light); color: var(--info); }

.category-name {
    flex: 1;
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-800);
}

.category-score {
    font-size: 14px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 6px;
}

.category-score.success { background: var(--success-light); color: var(--success); }
.category-score.warning { background: var(--warning-light); color: var(--warning); }
.category-score.error { background: var(--danger-light); color: var(--danger); }
.category-score.info { background: var(--info-light); color: var(--info); }

.category-toggle {
    color: var(--gray-400);
    font-size: 12px;
    transition: transform 0.3s;
}

.category-card.open .category-toggle {
    transform: rotate(180deg);
}

.category-body {
    display: none;
    padding: 0 20px 20px;
    border-top: 1px solid var(--gray-100);
}

.category-card.open .category-body {
    display: block;
}

/* Check items inside categories */
.check-list {
    list-style: none;
    padding: 16px 0 4px;
}

.check-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 0;
    font-size: 14px;
    color: var(--gray-700);
    border-bottom: 1px solid var(--gray-100);
}

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

.check-status {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    flex-shrink: 0;
    margin-top: 2px;
}

.check-status.success { background: var(--success-light); color: var(--success); }
.check-status.warning { background: var(--warning-light); color: var(--warning); }
.check-status.error { background: var(--danger-light); color: var(--danger); }
.check-status.info { background: var(--info-light); color: var(--info); }

.check-label {
    font-weight: 500;
    flex-shrink: 0;
    min-width: 140px;
    color: var(--gray-800);
}

.check-value {
    color: var(--gray-600);
    word-break: break-word;
}

/* Issues section in category */
.issues-list {
    list-style: none;
    padding: 8px 0;
}

.issue-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 6px 0;
    font-size: 13px;
    color: var(--gray-600);
}

.issue-item .icon {
    color: var(--danger);
    flex-shrink: 0;
    margin-top: 2px;
}

/* Suggestions */
.suggestions-section {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    padding: 28px;
    margin-top: 24px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.5s ease forwards;
    animation-delay: 1.2s;
}

.suggestions-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.suggestions-list {
    list-style: none;
}

.suggestion-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--gray-100);
    font-size: 14px;
    color: var(--gray-700);
}

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

.suggestion-item .suggestion-badge {
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    flex-shrink: 0;
    margin-top: 1px;
}

.suggestion-item .suggestion-badge.meta { background: #e0e7ff; color: #4338ca; }
.suggestion-item .suggestion-badge.headings { background: #fae8ff; color: #a21caf; }
.suggestion-item .suggestion-badge.images { background: #d1fae5; color: #059669; }
.suggestion-item .suggestion-badge.links { background: #e0f2fe; color: #0369a1; }
.suggestion-item .suggestion-badge.schema { background: #fef3c7; color: #b45309; }
.suggestion-item .suggestion-badge.keywords { background: #dbeafe; color: #1d4ed8; }
.suggestion-item .suggestion-badge.content { background: #fce7f3; color: #be185d; }
.suggestion-item .suggestion-badge.technical { background: #d1fae5; color: #047857; }
.suggestion-item .suggestion-badge.performance { background: #fef3c7; color: #b45309; }
.suggestion-item .suggestion-badge.open_graph { background: #e0e7ff; color: #4338ca; }
.suggestion-item .suggestion-badge.twitter_card { background: #e0f2fe; color: #0369a1; }
.suggestion-item .suggestion-badge.cms { background: #f3e8ff; color: #7c3aed; }
.suggestion-item .suggestion-badge.server { background: #ecfdf5; color: #047857; }
.suggestion-item .suggestion-badge.whois { background: #fef9c3; color: #854d0e; }

.suggestion-text {
    flex: 1;
}

.suggestion-text strong {
    color: var(--gray-800);
}

.load-more-section {
    text-align: center;
    margin-top: 16px;
}

.load-more-btn {
    padding: 10px 24px;
    background: var(--gray-100);
    color: var(--gray-600);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

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

/* Suggestion count badge */
.suggestion-count {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
    background: var(--gray-100);
    color: var(--gray-500);
}

/* Error */
.error-message {
    display: none;
    text-align: center;
    padding: 48px 24px;
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--gray-200);
    margin-bottom: 40px;
}

.error-message.active {
    display: block;
}

.error-title {
    font-size: 20px;
    font-weight: 700;
    color: var(--danger);
    margin-bottom: 8px;
}

.error-desc {
    color: var(--gray-500);
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 16px;
    }
    
    .hero {
        padding: 32px 16px;
    }
    
    .hero-title {
        font-size: 22px;
    }
    
    .search-input-wrapper {
        min-width: 100%;
    }
    
    .search-btn {
        width: 100%;
        justify-content: center;
    }
    
    .score-card {
        padding: 24px;
        flex-direction: column;
        text-align: center;
    }
    
    .score-meta {
        justify-content: center;
    }
    
    .category-body {
        padding: 0 16px 16px;
    }
    
    .check-item {
        flex-direction: column;
        gap: 4px;
    }
    
    .check-label {
        min-width: auto;
    }
}

/* Analysis time */
.analysis-time {
    font-size: 12px;
    color: var(--gray-400);
    margin-top: 8px;
}

/* Headings preview */
.heading-preview {
    margin-top: 8px;
    padding: 8px 12px;
    background: var(--gray-50);
    border-radius: 6px;
    font-size: 13px;
    line-height: 1.8;
}

.heading-preview .h1-preview { color: var(--gray-900); font-weight: 700; font-size: 14px; }
.heading-preview .h2-preview { color: var(--gray-700); font-weight: 600; padding-left: 16px; }
.heading-preview .h3-preview { color: var(--gray-600); padding-left: 32px; }

/* Progress bar */
.progress-bar-container {
    width: 100%;
    height: 4px;
    background: var(--gray-200);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 16px;
}

.progress-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 2px;
    transition: width 0.5s ease;
    width: 0%;
}

/* Honeypot anti-bot */
.honeypot {
    position: absolute !important;
    left: -99999px !important;
    top: -99999px !important;
    width: 1px !important;
    height: 1px !important;
    opacity: 0 !important;
    pointer-events: none !important;
}

/* Print styles for report */
@media print {
    .search-form, .header, .loading-section { display: none; }
    .category-card { break-inside: avoid; }
}