/* ===================================================
   Clinux - Professional Tech Blog Theme
   Inspired by TutorialsPoint style
   =================================================== */

:root {
    --color-primary: #e8590c;
    --color-primary-light: #f07c35;
    --color-primary-dark: #c44d0a;
    --color-header: #2c3e50;
    --color-header-dark: #1a252f;
    --color-bg: #f4f4f4;
    --color-surface: #ffffff;
    --color-surface-alt: #fafafa;
    --color-text: #333333;
    --color-text-light: #555555;
    --color-text-muted: #999999;
    --color-border: #e0e0e0;
    --color-border-dark: #cccccc;
    --color-success: #27ae60;
    --color-error: #e74c3c;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-heading: "Segoe UI", Roboto, -apple-system, sans-serif;
    --font-mono: "Fira Code", "Cascadia Code", Consolas, "Courier New", monospace;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 3px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius: 4px;
    --max-width: 1200px;
    --transition: 0.2s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-dark); }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-header);
    line-height: 1.35;
    font-weight: 700;
}

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 1.5rem; }

/* --- Header --- */
.site-header {
    background: var(--color-header);
    color: #fff;
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.25);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    gap: 1.5rem;
}
.logo {
    font-family: var(--font-body);
    font-size: 1.4rem;
    color: #fff !important;
    font-weight: 700;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 0.2rem;
    letter-spacing: -0.01em;
}
.logo img,
.site-logo-img {
    height: 38px;
    width: auto;
    object-fit: contain;
    display: block;
}
.logo-prompt {
    font-family: var(--font-mono);
    color: var(--color-primary);
    font-size: 1.2rem;
    font-weight: 700;
}
.logo-name {
    color: #fff;
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.02em;
}
.main-nav {
    display: flex;
    gap: 0;
    flex: 1;
    justify-content: center;
}
.main-nav a {
    color: rgba(255,255,255,0.85);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    border-bottom: 3px solid transparent;
}
.main-nav a:hover {
    color: #fff;
    background: rgba(255,255,255,0.08);
    border-bottom-color: var(--color-primary);
}
.header-actions { display: flex; align-items: center; gap: 0.75rem; }
.search-form input {
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.2);
    color: #fff;
    padding: 0.4rem 0.85rem;
    border-radius: 20px;
    font-size: 0.875rem;
    width: 180px;
    transition: all var(--transition);
}
.search-form input::placeholder { color: rgba(255,255,255,0.5); }
.search-form input:focus {
    outline: none;
    background: rgba(255,255,255,0.2);
    border-color: var(--color-primary);
    width: 220px;
    color: #fff;
}
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem;
}

/* --- Orange Top Bar (accent strip) --- */
.site-header::after {
    content: '';
    display: block;
    height: 3px;
    background: var(--color-primary);
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
}

/* --- Content Layout --- */
.site-content { padding: 2rem 0; min-height: calc(100vh - 180px); }
.content-wrapper { display: flex; gap: 2rem; }
.content-area { flex: 1; min-width: 0; }

/* --- Sidebar --- */
.sidebar { width: 290px; flex-shrink: 0; }
.widget {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 1.25rem;
    margin-bottom: 1.25rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}
.widget-title {
    font-size: 0.8rem;
    font-family: var(--font-body);
    font-weight: 700;
    color: var(--color-header);
    margin-bottom: 0.85rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
.sidebar-search { display: flex; gap: 0.4rem; }
.sidebar-search input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    background: var(--color-bg);
    color: var(--color-text);
}
.sidebar-search input:focus { outline: none; border-color: var(--color-primary); }
.sidebar-search button {
    padding: 0.5rem 0.85rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 600;
    transition: background var(--transition);
}
.sidebar-search button:hover { background: var(--color-primary-dark); }
.recent-posts { list-style: none; }
.recent-posts li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
}
.recent-posts li:last-child { border-bottom: none; }
.recent-posts a {
    font-size: 0.875rem;
    font-weight: 500;
    display: block;
    color: var(--color-text);
    line-height: 1.4;
}
.recent-posts a:hover { color: var(--color-primary); }
.recent-posts time {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-top: 0.15rem;
    display: block;
}
.category-list { list-style: none; }
.category-list li { padding: 0.2rem 0; }
.category-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--color-text-light);
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius);
    transition: all var(--transition);
}
.category-list a:hover { color: var(--color-primary); background: #fff8f5; padding-left: 0.85rem; }
.category-list .count {
    color: var(--color-text-muted);
    font-size: 0.75rem;
    background: var(--color-bg);
    padding: 0.1rem 0.45rem;
    border-radius: 10px;
    border: 1px solid var(--color-border);
}

/* --- Nav Dropdown --- */
.nav-dropdown { position: relative; }
.nav-dropdown-btn {
    background: none;
    border: none;
    color: rgba(255,255,255,0.85);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    gap: 0.35rem;
    white-space: nowrap;
    text-decoration: none;
    border-bottom: 3px solid transparent;
}
.nav-dropdown-btn:hover,
.nav-dropdown:hover .nav-dropdown-btn {
    color: #fff;
    background: rgba(255,255,255,0.08);
    border-bottom-color: var(--color-primary);
}
.nav-arrow { font-size: 0.5rem; transition: transform var(--transition); opacity: 0.6; }
.nav-dropdown:hover .nav-arrow { transform: rotate(180deg); opacity: 1; }
.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 3px);
    left: 50%;
    transform: translateX(-50%);
    background: #fff;
    border: 1px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
    border-radius: 0 0 var(--radius) var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 240px;
    max-width: 300px;
    z-index: 200;
    padding: 0.4rem 0;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu::before { display: none; }
.nav-dropdown-menu a {
    display: block;
    padding: 0.5rem 1.1rem;
    color: var(--color-text) !important;
    font-size: 0.875rem;
    font-weight: 400;
    transition: all var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    border-left: 3px solid transparent;
}
.nav-dropdown-menu a:hover {
    background: #fff8f5;
    color: var(--color-primary) !important;
    border-left-color: var(--color-primary);
}
.nav-dropdown-viewall {
    border-top: 1px solid var(--color-border) !important;
    margin-top: 0.25rem;
    font-weight: 700 !important;
    color: var(--color-primary) !important;
    font-size: 0.8rem !important;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* --- Hero Banner --- */
.hero-banner {
    background: linear-gradient(135deg, var(--color-header) 0%, #2c4a6e 100%);
    border-radius: var(--radius);
    padding: 2.75rem 2.5rem;
    margin-bottom: 2rem;
    color: #fff;
    position: relative;
    overflow: hidden;
    border-left: 5px solid var(--color-primary);
}
.hero-banner::before {
    content: '';
    position: absolute;
    top: -60%;
    right: -5%;
    width: 400px;
    height: 400px;
    background: rgba(255,255,255,0.03);
    border-radius: 50%;
    pointer-events: none;
}
/* Hero logo */
.hero-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}
.hero-logo-img {
    height: 80px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.25));
}
.hero-eyebrow {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.25rem 0.75rem;
    border-radius: 2px;
    margin-bottom: 1rem;
}
.hero-title {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    color: #fff;
    line-height: 1.2;
    margin-bottom: 0.85rem;
}
.hero-subtitle {
    font-size: 1rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.7;
    max-width: 560px;
    margin-bottom: 1.75rem;
}
.hero-actions { display: flex; gap: 0.75rem; flex-wrap: wrap; margin-bottom: 1.5rem; }
.btn-hero-primary {
    background: var(--color-primary);
    color: #fff !important;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 700;
    font-size: 0.9rem;
    transition: all var(--transition);
}
.btn-hero-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(232,89,12,0.35); }
.btn-hero-secondary {
    background: rgba(255,255,255,0.1);
    color: #fff !important;
    padding: 0.6rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.9rem;
    border: 1px solid rgba(255,255,255,0.25);
    transition: all var(--transition);
}
.btn-hero-secondary:hover { background: rgba(255,255,255,0.18); border-color: rgba(255,255,255,0.5); }
.hero-topics { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.hero-topic-pill {
    background: rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.85) !important;
    padding: 0.25rem 0.85rem;
    border-radius: 2px;
    font-size: 0.8rem;
    font-weight: 500;
    border: 1px solid rgba(255,255,255,0.15);
    transition: all var(--transition);
}
.hero-topic-pill:hover { background: var(--color-primary); color: #fff !important; border-color: var(--color-primary); }

/* --- Section Heading --- */
.section-heading {
    font-size: 1.1rem;
    color: var(--color-header);
    margin-bottom: 1.25rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--color-border);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.section-heading::before {
    content: '';
    display: inline-block;
    width: 4px;
    height: 1.1rem;
    background: var(--color-primary);
    border-radius: 2px;
}

/* --- Post Cards --- */
.page-title { font-size: 1.8rem; margin-bottom: 0.4rem; color: var(--color-header); }
.page-subtitle { color: var(--color-text-muted); font-size: 1rem; margin-bottom: 1.75rem; }
.post-list { display: flex; flex-direction: column; gap: 1rem; }
.post-card {
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    display: flex;
    transition: all var(--transition);
}
.post-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}
.post-card-image { width: 240px; flex-shrink: 0; overflow: hidden; }
.post-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.post-card:hover .post-card-image img { transform: scale(1.04); }
.post-card-body { padding: 1.25rem 1.5rem; flex: 1; display: flex; flex-direction: column; }
.post-card-meta {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
}
.post-category {
    background: var(--color-primary);
    color: #fff !important;
    padding: 0.15rem 0.6rem;
    border-radius: 2px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.post-card-title { font-size: 1.15rem; margin-bottom: 0.4rem; line-height: 1.4; }
.post-card-title a { color: var(--color-header); }
.post-card-title a:hover { color: var(--color-primary); }
.post-card-excerpt { color: var(--color-text-light); font-size: 0.9rem; flex: 1; margin-bottom: 0.85rem; line-height: 1.6; }
.read-more {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
}
.read-more:hover { color: var(--color-primary-dark); gap: 0.5rem; }

/* --- Single Post --- */
.single-post, .single-page {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 2.25rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    border-top: 3px solid var(--color-primary);
}
.post-header { margin-bottom: 1.75rem; }
.post-title { font-size: 2rem; margin-bottom: 0.65rem; color: var(--color-header); line-height: 1.25; }
.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 0.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
}
.post-featured-image { margin-bottom: 1.75rem; border-radius: var(--radius); overflow: hidden; }
.post-content {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--color-text);
}
.post-content h2 {
    font-size: 1.5rem;
    margin: 2.25rem 0 0.85rem;
    color: var(--color-header);
    padding-bottom: 0.4rem;
    border-bottom: 2px solid var(--color-border);
}
.post-content h3 { font-size: 1.2rem; margin: 1.75rem 0 0.65rem; color: var(--color-header); }
.post-content h4 { font-size: 1rem; margin: 1.25rem 0 0.5rem; color: var(--color-text); font-weight: 700; }
.post-content p { margin-bottom: 1.25rem; }
.post-content ul, .post-content ol { margin: 0 0 1.25rem 1.5rem; }
.post-content li { margin-bottom: 0.45rem; }
.post-content a { color: var(--color-primary); border-bottom: 1px solid rgba(232,89,12,0.3); }
.post-content a:hover { color: var(--color-primary-dark); border-bottom-color: var(--color-primary-dark); }
.post-content blockquote {
    border-left: 4px solid var(--color-primary);
    padding: 0.85rem 1.5rem;
    margin: 1.75rem 0;
    background: #fff8f5;
    font-style: italic;
    border-radius: 0 var(--radius) var(--radius) 0;
    color: var(--color-text-light);
}
.post-content pre {
    background: #1e2d3d;
    color: #abb2bf;
    padding: 1.25rem 1.5rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin-bottom: 1.25rem;
    font-size: 0.875rem;
    font-family: var(--font-mono);
    line-height: 1.7;
    border-left: 4px solid var(--color-primary);
}
.post-content code {
    background: #fff0eb;
    color: #c0392b;
    padding: 0.15em 0.4em;
    border-radius: 3px;
    font-size: 0.875em;
    font-family: var(--font-mono);
    border: 1px solid #fad5c8;
}
.post-content pre code { background: none; padding: 0; border: none; color: #abb2bf; font-size: inherit; }
.post-content img { border-radius: var(--radius); margin: 1.5rem 0; border: 1px solid var(--color-border); }
.post-content table { width: 100%; border-collapse: collapse; margin-bottom: 1.5rem; font-size: 0.9rem; }
.post-content th { background: var(--color-header); color: #fff; padding: 0.65rem 1rem; text-align: left; font-weight: 600; }
.post-content td { padding: 0.6rem 1rem; border: 1px solid var(--color-border); }
.post-content tr:nth-child(even) td { background: #f9f9f9; }
.post-content tr:hover td { background: #fff8f5; }
.post-tags { margin-top: 2rem; padding-top: 1.25rem; border-top: 1px solid var(--color-border); display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
.tags-label { font-weight: 600; color: var(--color-text-muted); margin-right: 0.25rem; font-size: 0.875rem; }
.tag {
    background: var(--color-bg);
    color: var(--color-text-light);
    padding: 0.25rem 0.7rem;
    border-radius: 2px;
    font-size: 0.8rem;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}
.tag:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.post-footer { margin-top: 1.75rem; padding-top: 1rem; border-top: 1px solid var(--color-border); }
.back-link { font-weight: 500; font-size: 0.9rem; }

/* --- Search Page --- */
.search-page-form { display: flex; gap: 0.5rem; margin-bottom: 2rem; }
.search-page-form input {
    flex: 1;
    padding: 0.7rem 1rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 1rem;
    background: #fff;
    color: var(--color-text);
    transition: border-color var(--transition);
}
.search-page-form input:focus { outline: none; border-color: var(--color-primary); }
.search-page-form button {
    padding: 0.7rem 1.5rem;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius);
    font-size: 0.95rem;
    cursor: pointer;
    font-weight: 700;
    transition: background var(--transition);
}
.search-page-form button:hover { background: var(--color-primary-dark); }
.search-count { color: var(--color-text-muted); margin-bottom: 1.5rem; font-size: 0.9rem; }

/* --- Pagination --- */
.pagination { display: flex; justify-content: center; gap: 0.3rem; margin-top: 2rem; flex-wrap: wrap; }
.page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 38px;
    height: 38px;
    padding: 0 0.65rem;
    background: var(--color-surface);
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition);
}
.page-link:hover { background: #fff8f5; color: var(--color-primary); border-color: var(--color-primary); }
.page-link.current { background: var(--color-primary); color: #fff; border-color: var(--color-primary); font-weight: 700; }
.page-dots { display: flex; align-items: center; padding: 0 0.25rem; color: var(--color-text-muted); }

/* --- Breadcrumb --- */
.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 1.25rem;
    padding: 0.6rem 1rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}
.breadcrumb a { color: var(--color-primary); font-weight: 500; }
.breadcrumb a:hover { color: var(--color-primary-dark); text-decoration: underline; }
.breadcrumb-sep { color: var(--color-border-dark); font-size: 0.75rem; }
.breadcrumb-current { color: var(--color-text); font-weight: 600; }

/* --- Sort Bar --- */
.sort-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    padding: 0.6rem 1rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    flex-wrap: wrap;
}
.sort-label {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-right: 0.25rem;
}
.sort-option {
    font-size: 0.8rem;
    padding: 0.25rem 0.7rem;
    border-radius: 2px;
    color: var(--color-text-light);
    border: 1px solid var(--color-border);
    background: var(--color-surface-alt);
    transition: all var(--transition);
    font-weight: 500;
}
.sort-option:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background: #fff8f5;
}
.sort-option.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    font-weight: 700;
}

/* --- Post Views Count --- */
.post-views { font-size: 0.8rem; color: var(--color-text-muted); }

/* --- Category Header --- */
.category-header { margin-bottom: 1rem; }

/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 3.5rem 2rem;
    background: var(--color-surface);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

/* --- 404 Error Page --- */
.error-page { text-align: center; padding: 4rem 1rem; }
.error-page h1 { font-size: 6rem; color: var(--color-primary); margin-bottom: 0; line-height: 1; }
.error-page h2 { font-size: 1.5rem; color: var(--color-header); margin-bottom: 1rem; }
.error-page p { color: var(--color-text-muted); margin-bottom: 2rem; }

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 0.55rem 1.25rem;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    text-align: center;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }

/* --- Ad Slots --- */
.ad-slot { margin: 1.5rem 0; text-align: center; min-height: 90px; }
.ad-header { padding: 0.75rem 0; }
.ad-footer { padding: 0.75rem 0; }

/* --- Footer --- */
.site-footer {
    background: var(--color-header-dark);
    color: rgba(255,255,255,0.65);
    margin-top: 2.5rem;
    border-top: 3px solid var(--color-primary);
}
.footer-top {
    display: flex;
    gap: 3rem;
    padding: 2.5rem 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
}
.footer-brand { flex: 1.2; }
.footer-logo { display: flex; align-items: center; gap: 0.2rem; margin-bottom: 0.75rem; }
.footer-logo .logo-prompt { font-family: var(--font-mono); color: var(--color-primary); font-size: 1.1rem; font-weight: 700; }
.footer-logo .logo-name { color: #fff; font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; }
.footer-tagline { font-size: 0.875rem; color: rgba(255,255,255,0.5); line-height: 1.7; margin-bottom: 1.25rem; max-width: 260px; }
.footer-social { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.footer-social a {
    color: rgba(255,255,255,0.6);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.3rem 0.75rem;
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 2px;
    transition: all var(--transition);
}
.footer-social a:hover { color: #fff; border-color: var(--color-primary); background: var(--color-primary); }
.footer-links { display: flex; gap: 3rem; flex-shrink: 0; }
.footer-col h4.footer-col-title {
    color: #fff;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.5rem; }
.footer-col ul a { color: rgba(255,255,255,0.55); font-size: 0.875rem; transition: color var(--transition); }
.footer-col ul a:hover { color: var(--color-primary); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); }
.footer-bottom-inner {
    padding: 1rem 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
    font-size: 0.8rem;
    color: rgba(255,255,255,0.35);
}

/* --- Responsive --- */
@media (max-width: 992px) {
    .post-card { flex-direction: column; }
    .post-card-image { width: 100%; height: 200px; }
}

@media (max-width: 768px) {
    .content-wrapper { flex-direction: column; }
    .sidebar { width: 100%; }
    .main-nav {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-header);
        flex-direction: column;
        padding: 0.75rem;
        box-shadow: var(--shadow-lg);
        border-top: 2px solid var(--color-primary);
    }
    .main-nav.active { display: flex; }
    .mobile-menu-toggle { display: block; }
    .search-form input { width: 130px; }
    .search-form input:focus { width: 130px; }
    .header-inner { gap: 0.75rem; }
    .post-title { font-size: 1.6rem; }
    .hero-title { font-size: 1.7rem; }
    .hero-banner { padding: 1.75rem 1.5rem; }
    .single-post, .single-page { padding: 1.5rem; }
    .footer-top { flex-direction: column; gap: 2rem; padding: 2rem 1.5rem; }
    .footer-links { gap: 2rem; }
    .footer-bottom-inner { text-align: center; }
    .nav-dropdown { width: 100%; }
    .nav-dropdown-btn { width: 100%; justify-content: space-between; border-bottom: none; border-top: 1px solid rgba(255,255,255,0.08); }
    .nav-dropdown-menu {
        position: static !important;
        transform: none !important;
        box-shadow: none;
        border: none;
        border-top: none;
        border-radius: 0;
        background: rgba(0,0,0,0.15);
        min-width: 0;
        max-width: none;
        padding: 0;
        display: none !important;
    }
    .nav-dropdown.open .nav-dropdown-menu { display: block !important; }
    .nav-dropdown:hover .nav-dropdown-menu { display: none !important; }
    .nav-dropdown.open:hover .nav-dropdown-menu,
    .nav-dropdown.open .nav-dropdown-menu { display: block !important; }
    .nav-dropdown-menu a {
        color: rgba(255,255,255,0.75) !important;
        padding: 0.5rem 1rem 0.5rem 2rem;
        font-size: 0.85rem;
        white-space: normal;
        border-left: none;
    }
    .nav-dropdown-menu a:hover { background: rgba(255,255,255,0.08); color: #fff !important; }
}

/* ============================================================
   COURSE / SERIES STYLES
   ============================================================ */

/* --- Course Header (category page) --- */
.course-header {
    background: linear-gradient(135deg, var(--color-header) 0%, #2c4a6e 100%);
    border-radius: var(--radius);
    padding: 2.5rem 2rem;
    margin-bottom: 1.75rem;
    color: #fff;
    border-left: 5px solid var(--color-primary);
    position: relative;
    overflow: hidden;
}
.course-header::before {
    content: '';
    position: absolute;
    top: -50%; right: -5%;
    width: 350px; height: 350px;
    background: rgba(255,255,255,0.03);
    border-radius: 50%;
    pointer-events: none;
}
.course-header-meta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.85rem;
}
.course-badge {
    background: var(--color-primary);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.2rem 0.65rem;
    border-radius: 2px;
}
.course-count {
    color: rgba(255,255,255,0.65);
    font-size: 0.85rem;
}
.course-title {
    color: #fff;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.25;
}
.course-description {
    color: rgba(255,255,255,0.8);
    font-size: 1rem;
    line-height: 1.65;
    margin-bottom: 1.5rem;
    max-width: 680px;
}
.course-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* --- Course TOC --- */
.course-toc {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}
.course-toc-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 2px solid var(--color-primary);
    background: var(--color-surface-alt);
    flex-wrap: wrap;
    gap: 0.5rem;
}
.course-toc-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-header);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0;
}
.course-toc-subtitle {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* --- Chapter list items --- */
.chapter-list {
    list-style: none;
    margin: 0;
    padding: 0;
    counter-reset: chapter-counter;
}
.chapter-item {
    border-bottom: 1px solid var(--color-border);
}
.chapter-item:last-child { border-bottom: none; }
.chapter-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.95rem 1.5rem;
    color: var(--color-text);
    text-decoration: none;
    transition: background var(--transition), border-color var(--transition);
    border-left: 3px solid transparent;
}
.chapter-link:hover {
    background: #fff8f5;
    border-left-color: var(--color-primary);
    color: var(--color-text);
}
.chapter-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    min-width: 2rem;
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: 50%;
    font-size: 0.78rem;
    font-weight: 700;
    color: var(--color-text-light);
    transition: all var(--transition);
}
.chapter-link:hover .chapter-number {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}
.chapter-info {
    flex: 1;
    min-width: 0;
}
.chapter-title {
    display: block;
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.4;
    color: var(--color-text);
}
.chapter-link:hover .chapter-title { color: var(--color-primary); }
.chapter-excerpt {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.2rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.chapter-arrow {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: transform var(--transition), color var(--transition);
}
.chapter-link:hover .chapter-arrow {
    color: var(--color-primary);
    transform: translateX(3px);
}

/* --- Chapter badge in post header --- */
.post-chapter-badge {
    display: inline-block;
    background: var(--color-primary);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.15rem 0.6rem;
    border-radius: 2px;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

/* --- Chapter navigation bar (top & bottom of post) --- */
.chapter-nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 0.75rem;
    align-items: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 0.85rem 1.25rem;
    box-shadow: var(--shadow-sm);
}
.chapter-nav-top { margin-bottom: 1.5rem; }
.chapter-nav-bottom { margin-top: 2rem; }

.chapter-nav-btn {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
    text-decoration: none;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius);
    transition: background var(--transition);
    max-width: 240px;
}
.chapter-nav-btn:hover { background: var(--color-bg); }
.chapter-nav-btn-next { align-items: flex-end; margin-left: auto; }

.chapter-nav-dir {
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
}
.chapter-nav-label {
    font-size: 0.85rem;
    color: var(--color-text);
    font-weight: 500;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.chapter-nav-disabled {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    padding: 0.5rem 0.75rem;
    font-style: italic;
}
.chapter-nav-center {
    text-align: center;
    flex-shrink: 0;
}
.chapter-nav-index {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.15rem;
    text-decoration: none;
    padding: 0.4rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    transition: all var(--transition);
}
.chapter-nav-index:hover {
    border-color: var(--color-primary);
    background: var(--color-bg);
}
.chapter-nav-progress {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-header);
}
.chapter-nav-course {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

/* ============================================================
   END COURSE / SERIES STYLES
   ============================================================ */

@media (max-width: 480px) {
    .page-title { font-size: 1.4rem; }
    .post-card-body { padding: 1rem; }
    .search-form { display: none; }
    .hero-title { font-size: 1.5rem; }
    .hero-banner { padding: 1.5rem 1.25rem; }
    .sort-bar { gap: 0.35rem; padding: 0.5rem 0.75rem; }
    .sort-option { padding: 0.2rem 0.5rem; font-size: 0.7rem; }
    .breadcrumb { font-size: 0.75rem; padding: 0.5rem 0.75rem; }
    /* Course / Chapter responsive */
    .course-title { font-size: 1.4rem; }
    .course-header { padding: 1.5rem 1.25rem; }
    .course-actions { flex-direction: column; }
    .chapter-nav { grid-template-columns: 1fr 1fr; grid-template-rows: auto auto; }
    .chapter-nav-center { grid-column: 1 / -1; order: -1; }
    .chapter-nav-btn-next { align-items: flex-end; }
    .chapter-link { padding: 0.85rem 1rem; }
    .chapter-excerpt { display: none; }
}