:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --primary-light: #4a90d9;
    --accent: #00bcd4;
    --dark: #f8f9fa;
    --darker: #ffffff;
    --darkest: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1a1a2e;
    --text-muted: #6b7280;
    --border: #e0e4ea;
    --success: #00c853;
    --warning: #ffd600;
    --danger: #ff1744;
}

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

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--darkest);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: var(--darker) !important;
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.navbar-brand {
    display: flex;
    align-items: center;
    color: var(--text) !important;
}

.nav-link {
    color: var(--text-muted) !important;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary) !important;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, #e8f0fe 0%, #ffffff 100%);
    padding: 6rem 0 4rem;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto 2rem;
}

/* Buttons */
.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
}

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

.btn-outline-light {
    color: var(--text);
    border-color: var(--border);
}

.btn-outline-light:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.btn-primary, .btn-outline-light, .btn-success, .btn-info, .btn-warning {
    border-radius: 8px;
    font-weight: 600;
    padding: 0.5rem 1.5rem;
    transition: all 0.2s;
}

/* Cards */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}

.card-title {
    color: var(--text);
    font-weight: 700;
}

.card-text {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.card .badge {
    font-weight: 600;
    padding: 0.4rem 0.8rem;
}

/* Software detail page */
.software-header {
    background: linear-gradient(135deg, #e8f0fe 0%, #ffffff 100%);
    padding: 3rem 0;
    border-bottom: 1px solid var(--border);
}

.software-title {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--text);
}

.software-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
}

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

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

.feature-list li i {
    color: var(--success);
    font-size: 1.1rem;
}

/* Sections */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 2rem;
    color: var(--text);
}

.section-subtitle {
    color: var(--text-muted);
    margin-bottom: 3rem;
}

/* Blog */
.blog-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s;
}

.blog-card:hover {
    transform: translateY(-3px);
}

.blog-card-body {
    padding: 1.5rem;
}

.blog-card .badge {
    font-size: 0.75rem;
    font-weight: 600;
}

.blog-card h5 {
    color: var(--text);
    margin: 0.5rem 0;
}

.blog-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.blog-card .btn-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

/* Blog thumbnails retain one consistent crop, regardless of the uploaded image size. */
.blog-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    height: auto;
    object-fit: cover;
    object-position: center;
}

.blog-thumbnail-home {
    aspect-ratio: 16 / 9;
    height: auto;
}

/* Article detail */
.article-content {
    font-size: 1.05rem;
    line-height: 1.8;
}

.article-content h2 {
    color: var(--text);
    font-weight: 700;
    margin: 2rem 0 1rem;
}

.article-content h3 {
    color: var(--text);
    font-weight: 600;
    margin: 1.5rem 0 0.75rem;
}

.article-content p {
    margin-bottom: 1rem;
    color: var(--text);
}

.article-content ul, .article-content ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.article-content li {
    margin-bottom: 0.5rem;
}

.article-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 0.75rem 1.5rem;
    margin: 1.5rem 0;
    background: rgba(26,115,232,0.06);
    border-radius: 4px;
    font-style: italic;
}

.article-content code {
    background: rgba(0,0,0,0.05);
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

.article-content pre {
    background: #f8f9fa;
    padding: 1rem;
    border-radius: 8px;
    overflow-x: auto;
    border: 1px solid var(--border);
    margin: 1rem 0;
}

/* Reviews & Comments */
.review-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem;
}

.reviewer-name {
    font-weight: 600;
    color: var(--text);
}

.review-text {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.stars {
    color: var(--warning);
}

/* SEO pages */
.seo-page-content h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 1.5rem;
}

.seo-page-content h2 {
    color: var(--primary);
    font-weight: 700;
    margin: 2rem 0 1rem;
    font-size: 1.4rem;
}

.seo-page-content p {
    margin-bottom: 1rem;
}

.seo-page-content ul {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.seo-page-content li {
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    background: #ffffff;
    border-top: 1px solid var(--border);
    padding: 3rem 0 3rem;
}

.footer h6 {
    color: var(--text);
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer a {
    color: var(--text-muted);
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

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

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 1rem;
    margin-top: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Pagination */
.pagination {
    justify-content: center;
    margin-top: 2rem;
}

.page-link {
    background: var(--card-bg);
    border-color: var(--border);
    color: var(--text);
}

.page-link:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.page-item.active .page-link {
    background: var(--primary);
    border-color: var(--primary);
}

.page-item.disabled .page-link {
    background: var(--card-bg);
    color: var(--text-muted);
}

/* Forms */
.form-control, .form-select {
    background: #ffffff;
    border: 1px solid var(--border);
    color: var(--text);
    border-radius: 8px;
}

.form-control:focus, .form-select:focus {
    background: #ffffff;
    border-color: var(--primary);
    color: var(--text);
    box-shadow: 0 0 0 2px rgba(26,115,232,0.25);
}

.form-control::placeholder {
    color: var(--text-muted);
}

.form-label {
    color: var(--text);
    font-weight: 600;
    font-size: 0.9rem;
}

/* Alerts */
.alert {
    border-radius: 10px;
}

.alert-success {
    background: rgba(0,200,83,0.08);
    border-color: rgba(0,200,83,0.2);
    color: #1a7a3a;
}

.alert-danger {
    background: rgba(255,23,68,0.08);
    border-color: rgba(255,23,68,0.2);
    color: #b71c1c;
}

.alert-info {
    background: rgba(26,115,232,0.08);
    border-color: rgba(26,115,232,0.2);
    color: var(--primary-dark);
}

/* FAQ accordion */
.accordion-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
}

.accordion-button {
    background: var(--card-bg);
    color: var(--text);
    font-weight: 600;
}

.accordion-button:not(.collapsed) {
    background: #f8f9fa;
    color: var(--primary);
}

.accordion-button::after {
    filter: none;
}

.accordion-body {
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 1rem; }
    .software-title { font-size: 1.6rem; }
    .section-title { font-size: 1.5rem; }
}

/* Animations */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Category Buttons */
.category-btn {
    display: inline-flex;
    align-items: center;
    padding: 0.85rem 2rem;
    border-radius: 10px;
    font-weight: 600;
    font-size: 1.05rem;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.category-btn-browse {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.category-btn-browse:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26,115,232,0.35);
}

.category-btn-ai {
    background: #fff;
    color: var(--primary);
    border-color: var(--primary);
}

.category-btn-ai:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26,115,232,0.35);
}

.category-btn-business {
    background: #fff;
    color: var(--primary);
    border-color: var(--primary);
}

.category-btn-business:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26,115,232,0.35);
}

/* Dark Mode */
body.dark-mode { background-color: #0f1117; color: #ffffff; }
body.dark-mode .navbar { background: #161b22 !important; }
body.dark-mode .footer { background: #161b22; border-top: 1px solid #21262d; }
/* Turn the supplied Intro3 mark into a clean, high-contrast white mark. */
body.dark-mode .navbar-brand img,
body.dark-mode .footer img { filter: brightness(0) invert(1); }
body.dark-mode h1, body.dark-mode h2, body.dark-mode h3, body.dark-mode h4,
body.dark-mode h5, body.dark-mode h6, body.dark-mode p, body.dark-mode li,
body.dark-mode td, body.dark-mode th, body.dark-mode label, body.dark-mode .form-label,
body.dark-mode .card-title, body.dark-mode .software-title, body.dark-mode .text-dark {
    color: #ffffff !important;
}
body.dark-mode .footer h6, body.dark-mode .footer h5, body.dark-mode .section-title { color: #ffffff; }
body.dark-mode .footer a { color: #e4ebf5; }
body.dark-mode .footer a:hover { color: #58a6ff; }
body.dark-mode .card { background: #161b22; border-color: #21262d; color: #ffffff; }
body.dark-mode .card-body { color: #ffffff; }
body.dark-mode .card-footer { border-color: #21262d; background: #161b22 !important; }
body.dark-mode .section-subtitle, body.dark-mode .text-muted,
body.dark-mode .card-text, body.dark-mode .accordion-body { color: #d9e2ef !important; }
body.dark-mode .bg-dark-section { background: #0d1117 !important; }
body.dark-mode .hero { background: linear-gradient(135deg, #161b22, #0d1117) !important; border-bottom-color: #21262d; }
body.dark-mode .hero h1 { background: none; -webkit-text-fill-color: #fff; }
body.dark-mode .software-card:hover, body.dark-mode .blog-card:hover { border-color: #58a6ff; }
body.dark-mode .form-control, body.dark-mode .form-select {
    background: #0d1117;
    border-color: #30363d;
    color: #ffffff;
}
body.dark-mode .form-control:focus, body.dark-mode .form-select:focus {
    background: #0d1117;
    color: #ffffff;
}
body.dark-mode .form-control::placeholder { color: #a9b6c6; }
body.dark-mode .navbar-nav .nav-link { color: #ffffff !important; }
body.dark-mode .navbar-nav .nav-link:hover { color: #58a6ff; }
body.dark-mode .dropdown-menu { background: #161b22; border-color: #21262d; }
body.dark-mode .dropdown-item { color: #c9d1d9; }
body.dark-mode .dropdown-item:hover { background: #21262d; color: #58a6ff; }
body.dark-mode a { color: #58a6ff; }
body.dark-mode #darkModeToggle { border-color: #30363d; color: #c9d1d9; }
body.dark-mode #darkModeToggle:hover { background: #21262d; color: #58a6ff; }

/* Keep all navigation and action labels clearly visible in dark mode. */
body.dark-mode .navbar .btn,
body.dark-mode .btn-primary,
body.dark-mode .btn-success,
body.dark-mode .btn-info,
body.dark-mode .btn-warning,
body.dark-mode .btn-danger,
body.dark-mode .btn-secondary,
body.dark-mode .btn-dark,
body.dark-mode .category-btn-browse,
body.dark-mode .software-card .btn,
body.dark-mode .blog-card .btn {
    color: #ffffff !important;
}