:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #1e293b;
    --accent-color: #f59e0b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --border-radius: 12px;
    --box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --light-bg: #0f172a;
    --card-bg: #1e293b;
    --text-dark: #f1f5f9;
    --text-light: #cbd5e1;
    --border-color: #334155;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--light-bg);
    color: var(--text-dark);
    line-height: 1.6;
    transition: var(--transition);
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--box-shadow);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.dark-mode-btn {
    background: none;
    border: 1px solid var(--border-color);
    color: var(--text-dark);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.dark-mode-btn:hover {
    background-color: var(--light-bg);
    color: var(--primary-color);
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.main-header {
    padding: 3rem 0 2rem;
    text-align: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 2rem;
}

.header-content h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.header-content p {
    font-size: 1.1rem;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* Search Section */
.search-section {
    margin-bottom: 3rem;
}

.search-form {
    max-width: 700px;
    margin: 0 auto;
}

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

.input-wrapper input {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: var(--card-bg);
    color: var(--text-dark);
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
}

.input-wrapper input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-btn {
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.search-btn:active {
    transform: translateY(0);
}

.url-examples {
    text-align: center;
    margin-top: 1rem;
}

.url-examples small {
    color: var(--text-light);
    font-size: 0.9rem;
}

/* Alerts */
.alert {
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 2rem;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    border-left: 4px solid transparent;
}

.alert-error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border-left-color: var(--error-color);
}

.alert-error strong {
    display: block;
    margin-bottom: 0.5rem;
}

/* Results Section */
.results-section {
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.url-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-color);
}

.url-header h2 {
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.url-text {
    color: var(--primary-color);
    word-break: break-all;
    font-size: 0.85em;
}

.action-buttons {
    display: flex;
    gap: 0.5rem;
}

.export-btn {
    padding: 0.75rem 1.5rem;
    background-color: var(--light-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    color: var(--text-dark);
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.export-btn:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* SEO Recommendations Section */
.recommendations-section {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
    border-left: 4px solid var(--warning-color);
}

.recommendations-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.recommendations-header h3 {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.recommendations-header p {
    color: var(--text-light);
    font-size: 0.9rem;
}

.recommendations-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.recommendation-item {
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid;
    background-color: var(--light-bg);
}

.recommendation-item.priority-critical {
    border-left-color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.05);
}

.recommendation-item.priority-high {
    border-left-color: var(--warning-color);
    background-color: rgba(245, 158, 11, 0.05);
}

.recommendation-item.priority-medium {
    border-left-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.recommendation-item.priority-low {
    border-left-color: var(--success-color);
    background-color: rgba(16, 185, 129, 0.05);
}

.rec-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.rec-priority {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    color: white;
    flex-shrink: 0;
}

.rec-priority.critical {
    background-color: var(--error-color);
}

.rec-priority.high {
    background-color: var(--warning-color);
}

.rec-priority.medium {
    background-color: var(--primary-color);
}

.rec-priority.low {
    background-color: var(--success-color);
}

.rec-title {
    font-weight: 600;
    color: var(--text-dark);
}

.rec-message {
    margin: 0;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* SEO Score Card */
.seo-score-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--box-shadow);
}

.score-display {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 2rem;
    align-items: center;
}

.score-circle {
    position: relative;
    width: 150px;
    height: 150px;
    margin: 0 auto;
}

svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.score-background {
    fill: none;
    stroke: var(--border-color);
    stroke-width: 8;
}

.score-progress {
    fill: none;
    stroke: url(#scoreGradient);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 282.7;
    stroke-dashoffset: calc(282.7 - (282.7 * var(--score) / 100));
    transition: stroke-dashoffset 1s ease;
}

.score-number {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
}

.score-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.score-status {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.score-status.excellent {
    color: var(--success-color);
}

.score-status.good {
    color: var(--success-color);
}

.score-status.average {
    color: var(--warning-color);
}

.score-status.poor {
    color: var(--error-color);
}

.score-breakdown {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.breakdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.9rem;
}

.check-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: white;
}

.check-icon.pass {
    background-color: var(--success-color);
}

.check-icon.fail {
    background-color: var(--error-color);
}

/* Tabs */
.tabs-container {
    margin-bottom: 2rem;
}

.tabs-nav {
    display: flex;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.tab-btn {
    padding: 1rem 1.5rem;
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    color: var(--text-dark);
}

.tab-btn.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

/* Info Cards */
.info-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.info-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-lg);
}

.info-card.full-width {
    grid-column: 1 / -1;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1.25rem;
    font-size: 1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.card-body {
    padding: 1.5rem;
}

.value {
    font-size: 0.95rem;
    word-break: break-word;
    margin-bottom: 1rem;
    color: var(--text-dark);
}

.meta-hint {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.meta-hint .length {
    color: var(--text-light);
}

.status {
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.status.optimal {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.status.warning {
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.url-link {
    color: var(--primary-color);
    text-decoration: none;
    word-break: break-all;
    transition: var(--transition);
}

.url-link:hover {
    text-decoration: underline;
}

/* Stats Display */
.heading-stats,
.link-stats,
.image-stats {
    display: flex;
    gap: 1rem;
    justify-content: space-around;
    margin-bottom: 0;
}

.stat {
    text-align: center;
}

.stat .label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.stat .count {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stat .count.optimal {
    color: var(--success-color);
}

.stat .count.warning {
    color: var(--error-color);
}

.stat .count.internal {
    color: var(--success-color);
}

.stat .count.external {
    color: var(--warning-color);
}

/* Tags List */
.tags-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tag-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--light-bg);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.tag-item.found {
    border-color: var(--success-color);
    background-color: rgba(16, 185, 129, 0.05);
}

.tag-item.missing {
    border-color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.05);
}

.tag-name {
    font-weight: 600;
    min-width: 120px;
    color: var(--text-dark);
    font-size: 0.9rem;
}

.tag-value {
    flex: 1;
    word-break: break-word;
    color: var(--text-light);
    font-size: 0.9rem;
}

.tag-value em {
    color: var(--text-light);
    font-style: italic;
}

.tag-status {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.75rem;
    color: white;
}

.tag-status.pass {
    background-color: var(--success-color);
}

.tag-status.fail {
    background-color: var(--error-color);
}

/* Checklist */
.checklist {
    display: grid;
    gap: 1rem;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background-color: var(--light-bg);
    border-radius: 8px;
    border-left: 3px solid var(--border-color);
    transition: var(--transition);
}

.check-item.pass {
    border-left-color: var(--success-color);
    background-color: rgba(16, 185, 129, 0.05);
}

.check-item.fail {
    border-left-color: var(--error-color);
    background-color: rgba(239, 68, 68, 0.05);
}

.check-item .check-icon {
    width: 28px;
    height: 28px;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.check-item label {
    font-weight: 500;
    cursor: pointer;
}

/* Content List */
.content-list {
    list-style: none;
}

.content-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.content-list li:last-child {
    border-bottom: none;
}

.content-list i {
    color: var(--primary-color);
    font-size: 0.5rem;
}

/* Progress Bar */
.progress-bar {
    width: 100%;
    height: 6px;
    background-color: var(--border-color);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 0.75rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success-color), var(--primary-color));
    border-radius: 3px;
}

/* Raw Data */
pre {
    background-color: var(--light-bg);
    padding: 1.5rem;
    border-radius: 8px;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.85rem;
    line-height: 1.5;
    border: 1px solid var(--border-color);
    max-height: 500px;
    overflow-y: auto;
}

pre::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

pre::-webkit-scrollbar-track {
    background: var(--border-color);
    border-radius: 4px;
}

pre::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

.copy-btn {
    margin-left: auto;
    background-color: transparent;
    border: none;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: var(--transition);
    font-family: 'Poppins', sans-serif;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.copy-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* Toast */
#toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background-color: var(--success-color);
    color: white;
    padding: 1rem 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
    transform: translateY(150px);
    opacity: 0;
    transition: var(--transition);
    z-index: 1000;
    max-width: 300px;
    word-wrap: break-word;
}

#toast.show {
    transform: translateY(0);
    opacity: 1;
}

/* Footer */
.footer {
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-content p {
    margin-bottom: 0.5rem;
    color: var(--text-light);
}

.footer-content p strong {
    color: var(--text-dark);
}

.footer-desc {
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .main-header h1 {
        font-size: 2rem;
    }

    .main-header p {
        font-size: 1rem;
    }

    .input-wrapper {
        flex-direction: column;
    }

    .input-wrapper input,
    .search-btn {
        width: 100%;
    }

    .url-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .score-display {
        grid-template-columns: 1fr;
    }

    .score-circle {
        width: 120px;
        height: 120px;
    }

    .score-number {
        font-size: 1.5rem;
    }

    .tabs-nav {
        overflow-x: auto;
        padding-bottom: 0.5rem;
    }

    .tab-btn {
        white-space: nowrap;
        font-size: 0.9rem;
    }

    .results-grid {
        grid-template-columns: 1fr;
    }

    .heading-stats,
    .link-stats,
    .image-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .score-breakdown {
        grid-template-columns: 1fr;
    }

    #toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
    }
}

/* Dark mode scrollbar */
[data-theme="dark"] pre::-webkit-scrollbar-track {
    background: var(--border-color);
}

[data-theme="dark"] pre::-webkit-scrollbar-thumb {
    background: var(--primary-color);
}