/* ═══════════════════════════════════════════════════════════════════════════
   RUBANLEARN - LEARN PLATFORM STYLESHEET
   learn.rubansoftwares.com

   Sections:
     1.  CSS Variables
     2.  Base Reset & Body
     3.  Typography Utilities
     4.  Navbar
     5.  Hero Sections
     6.  Tutorial Layout (sidebar + content + toc)
     7.  Sidebar Navigation
     8.  Code Blocks & Syntax
     9.  Content Components (callouts, tabs, cards, badges)
     10. Table of Contents (sticky)
     11. Related Tools & Tutorials
     12. FAQ Accordion
     13. Homepage Components
     14. Tutorial Cards & Category Grid
     15. Search
     16. Breadcrumbs
     17. Pagination / Prev-Next
     18. Footer
     19. Back to Top
     20. Responsive Overrides
   ═══════════════════════════════════════════════════════════════════════════ */


/* ══════════════════════════════════════════════════
   1. CSS VARIABLES
   ══════════════════════════════════════════════════ */
:root {
    /* Brand */
    --primary:        #e69829;
    --primary-dark:   #cb7c11;
    --primary-light:  #fff7ed;
    --accent:         #102b45;
    --accent-soft:    #e7eef6;

    /* Learn-specific */
    --learn-sidebar-w:   260px;
    --learn-toc-w:       220px;
    --learn-navbar-h:    60px;

    /* Text */
    --text-dark:   #1f2937;
    --text-muted:  #6b7280;
    --text-light:  #9ca3af;

    /* Surface */
    --white:       #ffffff;
    --bg:          #f8fafc;
    --bg-code:     #1e293b;
    --border:      #e5e7eb;
    --border-soft: #f1f5f9;

    /* Elevation */
    --shadow:      0 2px 16px rgba(16,43,69,.08);
    --shadow-md:   0 4px 24px rgba(16,43,69,.12);

    /* Shape */
    --radius:      10px;
    --radius-sm:   6px;
    --transition:  all 0.25s ease;

    /* Status */
    --success: #22c55e;
    --danger:  #ef4444;
    --warning: #f59e0b;
    --info:    #3b82f6;

    /* Callout colors */
    --callout-tip:     #ecfdf5;
    --callout-tip-b:   #22c55e;
    --callout-note:    #eff6ff;
    --callout-note-b:  #3b82f6;
    --callout-warn:    #fffbeb;
    --callout-warn-b:  #f59e0b;
    --callout-danger:  #fef2f2;
    --callout-danger-b:#ef4444;
}


/* ══════════════════════════════════════════════════
   2. BASE RESET & BODY
   ══════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--learn-navbar-h) + 1rem); }
body.learn-page {
    font-family: 'Inter', sans-serif;
    color: var(--text-dark);
    background: var(--bg);
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
body.learn-page main { flex: 1; flex-shrink: 0; }
body.learn-page .learn-footer { flex-shrink: 0; }

a { color: var(--accent); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary); }

img { max-width: 100%; height: auto; }

/* Custom scrollbar */
::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: var(--border-soft); }
::-webkit-scrollbar-thumb { background: var(--accent-soft); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #c8d4e0; }


/* ══════════════════════════════════════════════════
   3. TYPOGRAPHY UTILITIES
   ══════════════════════════════════════════════════ */
.section-label {
    font-size: .75rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 2px; color: var(--primary); display: block; margin-bottom: .5rem;
}
.section-title {
    font-size: clamp(1.8rem,3vw,2.6rem); font-weight: 800;
    color: var(--accent); line-height: 1.2;
}
.section-title span { color: var(--primary); }
.section-subtitle { color: var(--text-muted); font-size: 1.05rem; max-width: 640px; }
.divider { width: 56px; height: 4px; background: var(--primary); border-radius: 2px; margin: 1rem 0; }
.divider-center { margin: 1rem auto; }

/* Tutorial prose typography */
.tutorial-content h2 { font-size: 1.7rem; font-weight: 700; color: var(--accent); margin: 2.5rem 0 1rem; padding-top: .5rem; }
.tutorial-content h3 { font-size: 1.3rem; font-weight: 600; color: var(--accent); margin: 2rem 0 .75rem; }
.tutorial-content h4 { font-size: 1.1rem; font-weight: 600; margin: 1.5rem 0 .5rem; }
.tutorial-content p  { line-height: 1.8; margin-bottom: 1.25rem; font-size: 1rem; }
.tutorial-content ul, .tutorial-content ol { margin: 0 0 1.25rem 1.5rem; line-height: 1.8; }
.tutorial-content li { margin-bottom: .4rem; }
.tutorial-content table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; font-size: .93rem; }
.tutorial-content th { background: var(--accent); color: #fff; padding: .65rem 1rem; text-align: left; font-weight: 600; }
.tutorial-content td { padding: .6rem 1rem; border-bottom: 1px solid var(--border); }
.tutorial-content tr:hover td { background: var(--primary-light); }
.tutorial-content strong { color: var(--accent); }
.tutorial-content code:not([class]) {
    background: var(--accent-soft); color: var(--accent);
    padding: .15em .4em; border-radius: 4px;
    font-size: .88em; font-family: 'Fira Code', monospace;
}
.tutorial-content hr { border: none; border-top: 2px solid var(--border-soft); margin: 2.5rem 0; }


/* ══════════════════════════════════════════════════
   4. NAVBAR
   ══════════════════════════════════════════════════ */
.learn-navbar {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    height: var(--learn-navbar-h);
    z-index: 1040;
    box-shadow: 0 1px 8px rgba(16,43,69,.06);
}
.learn-navbar .navbar-collapse { align-items: center; }

.learn-brand { font-size: 1.4rem; font-weight: 800; line-height: 1; }
.learn-brand .brand-ruban { color: var(--accent); }
.learn-brand .brand-learn { color: var(--primary); }

.learn-navbar .nav-link {
    font-size: .9rem; font-weight: 500;
    color: var(--text-dark); padding: .4rem .75rem !important;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.learn-navbar .nav-link:hover,
.learn-navbar .nav-link.active { color: var(--primary); background: var(--primary-light); }

.learn-dropdown {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: .5rem;
    min-width: 220px;
}
.learn-dropdown .dropdown-item {
    border-radius: var(--radius-sm);
    font-size: .9rem; padding: .5rem .85rem;
    transition: var(--transition);
}
.learn-dropdown .dropdown-item:hover { background: var(--primary-light); color: var(--primary); }

.btn-ghost { background: transparent; border: 1px solid var(--border); color: var(--text-dark); }
.btn-ghost:hover { background: var(--accent-soft); }

.btn-outline-learn {
    font-size: .85rem; font-weight: 600;
    border: 1.5px solid var(--accent); color: var(--accent);
    border-radius: var(--radius-sm); padding: .35rem .85rem;
}
.btn-outline-learn:hover { background: var(--accent); color: #fff; }

.learn-toggler { border: 1px solid var(--border); border-radius: var(--radius-sm); padding: .3rem .5rem; background: transparent; }
.learn-toggler:focus { outline: none; box-shadow: none; }


/* ══════════════════════════════════════════════════
   5. HERO SECTIONS
   ══════════════════════════════════════════════════ */
.learn-hero {
    background: linear-gradient(135deg, var(--accent) 0%, #1e4060 100%);
    color: #fff;
    padding: 4rem 0 3rem;
    position: relative;
    overflow: hidden;
}
.learn-hero::before {
    content: '';
    position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.learn-hero .container-xl { position: relative; z-index: 1; }
.learn-hero h1 { font-size: clamp(2rem,4vw,3rem); font-weight: 800; line-height: 1.2; }
.learn-hero .hero-subtitle { font-size: 1.1rem; color: rgba(255,255,255,.8); margin-top: .75rem; }
.learn-hero .hero-meta { font-size: .85rem; color: rgba(255,255,255,.6); margin-top: .5rem; }
.learn-hero .hero-meta span { margin-right: 1.25rem; }
.learn-hero .hero-meta i { margin-right: .3rem; }

/* Compact page hero (for tutorial pages) */
.page-hero {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    padding: 1.75rem 0 1.5rem;
}
.page-hero .breadcrumb { margin-bottom: .5rem; }
.page-hero h1 { font-size: clamp(1.5rem,3vw,2.2rem); font-weight: 800; color: var(--accent); line-height: 1.25; }
.page-hero .hero-desc { color: var(--text-muted); margin-top: .5rem; font-size: .97rem; max-width: 720px; }


/* ══════════════════════════════════════════════════
   6. TUTORIAL LAYOUT (3-column)
   ══════════════════════════════════════════════════ */
.tutorial-layout {
    display: grid;
    grid-template-columns: var(--learn-sidebar-w) 1fr var(--learn-toc-w);
    grid-template-areas: "sidebar content toc";
    gap: 0;
    min-height: calc(100vh - var(--learn-navbar-h));
    align-items: start;
}

.tutorial-layout .layout-sidebar {
    grid-area: sidebar;
    position: sticky;
    top: var(--learn-navbar-h);
    height: calc(100vh - var(--learn-navbar-h));
    overflow-y: auto;
    border-right: 1px solid var(--border);
    background: var(--white);
    padding: 1.5rem 0;
}

.tutorial-layout .layout-content {
    grid-area: content;
    padding: 2.5rem 2.5rem 4rem;
    min-width: 0;
    background: var(--white);
}

.tutorial-layout .layout-toc {
    grid-area: toc;
    position: sticky;
    top: var(--learn-navbar-h);
    height: calc(100vh - var(--learn-navbar-h));
    overflow-y: auto;
    border-left: 1px solid var(--border);
    padding: 1.5rem 1.25rem;
    background: var(--white);
}

/* No-sidebar layout (wide content) */
.tutorial-layout.no-sidebar {
    grid-template-columns: 1fr var(--learn-toc-w);
    grid-template-areas: "content toc";
}
.tutorial-layout.no-toc {
    grid-template-columns: var(--learn-sidebar-w) 1fr;
    grid-template-areas: "sidebar content";
}
.tutorial-layout.no-sidebar.no-toc {
    grid-template-columns: 1fr;
    grid-template-areas: "content";
}


/* ══════════════════════════════════════════════════
   7. SIDEBAR NAVIGATION
   ══════════════════════════════════════════════════ */
.learn-sidebar { font-size: .875rem; }

.sidebar-section { margin-bottom: 1rem; }

.sidebar-heading {
    font-size: .7rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1.5px; color: var(--text-light);
    padding: .25rem 1.25rem; margin-bottom: .25rem;
    display: block;
}

.sidebar-nav { list-style: none; padding: 0; margin: 0; }

.sidebar-nav a {
    display: flex; align-items: center; gap: .5rem;
    padding: .45rem 1.25rem;
    color: var(--text-muted); font-size: .875rem; font-weight: 400;
    border-left: 3px solid transparent;
    transition: var(--transition);
    text-decoration: none;
}
.sidebar-nav a:hover { color: var(--primary); background: var(--primary-light); border-left-color: var(--primary); }
.sidebar-nav a.active { color: var(--primary); background: var(--primary-light); border-left-color: var(--primary); font-weight: 600; }
.sidebar-nav a .sidebar-icon { font-size: .8rem; opacity: .7; }

.sidebar-group-toggle {
    display: flex; align-items: center; justify-content: space-between;
    padding: .45rem 1.25rem; cursor: pointer;
    color: var(--text-dark); font-weight: 500; font-size: .875rem;
    background: none; border: none; width: 100%;
    transition: var(--transition);
}
.sidebar-group-toggle:hover { color: var(--primary); }
.sidebar-group-toggle .toggle-arrow { font-size: .75rem; transition: transform .2s ease; }
.sidebar-group-toggle[aria-expanded="true"] .toggle-arrow { transform: rotate(90deg); }

.sidebar-sub { list-style: none; padding: 0; margin: 0; }
.sidebar-sub a { padding-left: 2.25rem; font-size: .85rem; }

/* Mobile sidebar toggle button */
.sidebar-mobile-toggle {
    display: none;
    position: fixed;
    bottom: 1.25rem;
    left: 1.25rem;
    z-index: 1050;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    box-shadow: var(--shadow-md);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

/* Sidebar overlay on mobile */
.sidebar-backdrop {
    display: none;
    position: fixed; inset: 0;
    background: rgba(0,0,0,.35);
    z-index: 1035;
}
.sidebar-backdrop.active { display: block; }


/* ══════════════════════════════════════════════════
   8. CODE BLOCKS & SYNTAX
   ══════════════════════════════════════════════════ */
.code-block-wrap {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    margin: 1.5rem 0;
    box-shadow: var(--shadow);
}

.code-block-header {
    display: flex; align-items: center; justify-content: space-between;
    background: #0f172a; color: #94a3b8;
    padding: .5rem 1rem; font-size: .78rem;
    border-bottom: 1px solid rgba(255,255,255,.07);
}
.code-block-header .lang-badge { font-weight: 600; color: var(--primary); font-size: .75rem; text-transform: uppercase; letter-spacing: .5px; }
.code-block-header .code-filename { font-size: .78rem; font-family: monospace; }

.code-copy-btn {
    background: transparent; border: 1px solid rgba(255,255,255,.15);
    color: #94a3b8; font-size: .75rem; padding: .2rem .6rem;
    border-radius: 4px; cursor: pointer; transition: var(--transition);
    display: flex; align-items: center; gap: .3rem;
}
.code-copy-btn:hover { background: rgba(255,255,255,.1); color: #fff; }
.code-copy-btn.copied { color: #22c55e; border-color: #22c55e; }

.code-block-wrap pre[class*="language-"] {
    margin: 0; border-radius: 0;
    background: var(--bg-code);
    font-size: .875rem;
    max-height: 480px;
    overflow: auto;
}
.code-block-wrap pre[class*="language-"] code { font-family: 'Fira Code', 'Cascadia Code', 'Courier New', monospace; }

/* Output / result block */
.output-block {
    background: #0a0e1a; border: 1px solid rgba(255,255,255,.08);
    border-radius: var(--radius); padding: 1rem 1.25rem;
    font-family: monospace; font-size: .875rem;
    color: #a3e635; margin: 1rem 0;
    white-space: pre-wrap;
}
.output-block::before {
    content: 'Output'; display: block;
    font-size: .7rem; text-transform: uppercase; letter-spacing: 1px;
    color: #64748b; margin-bottom: .5rem; font-family: 'Inter', sans-serif;
}

/* Inline code */
code:not([class]) {
    background: var(--accent-soft); color: var(--accent);
    padding: .15em .45em; border-radius: 4px;
    font-size: .88em; font-family: 'Fira Code', monospace;
}


/* ══════════════════════════════════════════════════
   9. CONTENT COMPONENTS
   ══════════════════════════════════════════════════ */

/* Callouts */
.callout {
    border-left: 4px solid;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 1rem 1.25rem;
    margin: 1.5rem 0;
    font-size: .95rem;
}
.callout .callout-title { font-weight: 700; margin-bottom: .4rem; display: flex; align-items: center; gap: .5rem; }
.callout p:last-child { margin-bottom: 0; }
.callout-tip    { background: var(--callout-tip);    border-color: var(--callout-tip-b);    color: #15803d; }
.callout-note   { background: var(--callout-note);   border-color: var(--callout-note-b);   color: #1d4ed8; }
.callout-warn   { background: var(--callout-warn);   border-color: var(--callout-warn-b);   color: #92400e; }
.callout-danger { background: var(--callout-danger); border-color: var(--callout-danger-b); color: #991b1b; }

/* Tabs */
.learn-tabs .nav-tabs { border-bottom: 2px solid var(--border); gap: .25rem; }
.learn-tabs .nav-tabs .nav-link {
    border: none; border-bottom: 2px solid transparent; margin-bottom: -2px;
    font-size: .9rem; font-weight: 500; color: var(--text-muted);
    padding: .6rem 1rem; border-radius: 0; background: transparent;
    transition: var(--transition);
}
.learn-tabs .nav-tabs .nav-link:hover { color: var(--primary); }
.learn-tabs .nav-tabs .nav-link.active { color: var(--primary); border-bottom-color: var(--primary); }
.learn-tabs .tab-content { padding-top: 1.25rem; }

/* Badge levels */
.badge-level { font-size: .72rem; font-weight: 600; letter-spacing: .3px; }

/* Feature cards */
.learn-feature-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    height: 100%;
}
.learn-feature-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}
.learn-feature-card .feature-icon {
    width: 48px; height: 48px;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.3rem; color: var(--primary);
    margin-bottom: 1rem;
}
.learn-feature-card h5 { font-size: 1rem; font-weight: 700; color: var(--accent); margin-bottom: .35rem; }
.learn-feature-card p  { font-size: .88rem; color: var(--text-muted); margin: 0; }

/* Topic cards (tutorials index) */
.topic-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: flex; align-items: flex-start; gap: 1rem;
    transition: var(--transition);
    text-decoration: none;
    color: var(--text-dark);
}
.topic-card:hover {
    border-color: var(--primary); box-shadow: var(--shadow);
    transform: translateY(-2px); color: var(--text-dark);
}
.topic-card .topic-icon {
    width: 44px; height: 44px; flex-shrink: 0;
    background: var(--accent-soft);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; color: var(--accent);
}
.topic-card:hover .topic-icon { background: var(--primary-light); color: var(--primary); }
.topic-card h6 { font-size: .95rem; font-weight: 700; margin-bottom: .2rem; }
.topic-card p  { font-size: .82rem; color: var(--text-muted); margin: 0; }

/* Category section cards (homepage) */
.category-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.75rem;
    height: 100%;
    transition: var(--transition);
}
.category-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); }
.category-card .cat-icon {
    font-size: 2rem; margin-bottom: 1rem;
    width: 56px; height: 56px;
    background: var(--primary-light); border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    color: var(--primary);
}
.category-card h5 { font-size: 1.1rem; font-weight: 700; color: var(--accent); margin-bottom: .5rem; }
.category-card .cat-topics { list-style: none; padding: 0; margin: .75rem 0 0; }
.category-card .cat-topics li a {
    font-size: .875rem; color: var(--text-muted);
    display: flex; align-items: center; gap: .4rem;
    padding: .2rem 0;
    text-decoration: none;
    transition: var(--transition);
}
.category-card .cat-topics li a:hover { color: var(--primary); }
.category-card .cat-topics li a i { font-size: .7rem; }


/* ══════════════════════════════════════════════════
   10. TABLE OF CONTENTS (sticky right panel)
   ══════════════════════════════════════════════════ */
.learn-toc {}
.learn-toc .toc-title {
    font-size: .72rem; font-weight: 700; text-transform: uppercase;
    letter-spacing: 1.5px; color: var(--text-light);
    margin-bottom: .75rem; display: block;
}
.learn-toc ol { list-style: none; padding: 0; margin: 0; }
.learn-toc li { margin-bottom: .1rem; }
.learn-toc a {
    font-size: .82rem; color: var(--text-muted);
    display: block; padding: .3rem .5rem;
    border-left: 2px solid transparent;
    border-radius: 0 4px 4px 0;
    transition: var(--transition);
}
.learn-toc a:hover  { color: var(--primary); border-left-color: var(--primary); }
.learn-toc a.active { color: var(--primary); border-left-color: var(--primary); font-weight: 600; background: var(--primary-light); }
.learn-toc .toc-h3 a { padding-left: 1.25rem; font-size: .8rem; }
.learn-toc .toc-h4 a { padding-left: 2rem; font-size: .78rem; }


/* ══════════════════════════════════════════════════
   11. RELATED TOOLS & TUTORIALS
   ══════════════════════════════════════════════════ */
.related-tools-section, .related-tutorials-section {
    background: var(--bg);
    border-top: 1px solid var(--border);
    padding: 2.5rem 0;
}
.related-tool-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    display: flex; align-items: center; gap: .85rem;
    text-decoration: none; color: var(--text-dark);
    transition: var(--transition);
}
.related-tool-card:hover { border-color: var(--primary); box-shadow: var(--shadow); color: var(--text-dark); }
.related-tool-card .tool-icon {
    width: 40px; height: 40px; flex-shrink: 0;
    background: var(--primary-light); border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.1rem; color: var(--primary);
}
.related-tool-card h6 { font-size: .9rem; font-weight: 700; margin-bottom: .15rem; }
.related-tool-card p  { font-size: .8rem; color: var(--text-muted); margin: 0; }
.related-tool-card .tool-arrow { margin-left: auto; font-size: .85rem; color: var(--text-light); }

.related-tutorial-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    text-decoration: none; color: var(--text-dark);
    transition: var(--transition);
    display: block;
}
.related-tutorial-card:hover { border-color: var(--accent); box-shadow: var(--shadow); color: var(--text-dark); }
.related-tutorial-card h6 { font-size: .9rem; font-weight: 600; margin-bottom: .25rem; color: var(--accent); }
.related-tutorial-card p  { font-size: .82rem; color: var(--text-muted); margin: 0; }


/* ══════════════════════════════════════════════════
   12. FAQ ACCORDION
   ══════════════════════════════════════════════════ */
.faq-section { padding: 3rem 0; background: var(--white); }
.faq-accordion .accordion-item {
    border: 1px solid var(--border);
    border-radius: var(--radius) !important;
    margin-bottom: .75rem;
    overflow: hidden;
}
.faq-accordion .accordion-button {
    font-size: .95rem; font-weight: 600;
    color: var(--text-dark); background: var(--white);
    box-shadow: none !important;
    padding: 1.1rem 1.25rem;
}
.faq-accordion .accordion-button:not(.collapsed) {
    color: var(--primary); background: var(--primary-light);
}
.faq-accordion .accordion-button::after {
    filter: none;
}
.faq-accordion .accordion-body { font-size: .93rem; color: var(--text-muted); line-height: 1.7; }


/* ══════════════════════════════════════════════════
   13. HOMEPAGE COMPONENTS
   ══════════════════════════════════════════════════ */
.learn-homepage-hero {
    background: linear-gradient(135deg, var(--accent) 0%, #1e4060 60%, #0f2234 100%);
    padding: 5rem 0 4rem;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.learn-homepage-hero::before {
    content: '';
    position: absolute; inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.025'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.learn-homepage-hero .container-xl { position: relative; z-index: 1; }
.learn-homepage-hero h1 { font-size: clamp(2.2rem,5vw,3.5rem); font-weight: 900; line-height: 1.15; }
.learn-homepage-hero h1 span { color: var(--primary); }
.learn-homepage-hero .hero-sub { font-size: 1.1rem; color: rgba(255,255,255,.75); margin-top: 1rem; max-width: 580px; }
.learn-homepage-hero .hero-cta { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: .75rem; }
.btn-learn-primary {
    background: var(--primary); color: #fff; font-weight: 700;
    border: none; border-radius: var(--radius-sm); padding: .75rem 1.75rem;
    font-size: 1rem; transition: var(--transition);
}
.btn-learn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-learn-outline {
    background: transparent; color: #fff; font-weight: 600;
    border: 1.5px solid rgba(255,255,255,.4); border-radius: var(--radius-sm);
    padding: .75rem 1.75rem; font-size: 1rem; transition: var(--transition);
}
.btn-learn-outline:hover { background: rgba(255,255,255,.1); color: #fff; border-color: #fff; }

/* Stats strip */
.learn-stats-strip { background: var(--white); border-bottom: 1px solid var(--border); padding: 1rem 0; }
.stat-item { text-align: center; }
.stat-item .stat-val { font-size: 1.4rem; font-weight: 800; color: var(--accent); line-height: 1; }
.stat-item .stat-val span { color: var(--primary); }
.stat-item .stat-label { font-size: .75rem; color: var(--text-muted); margin-top: .25rem; }

/* Section bg variants */
.bg-learn-soft { background: var(--bg); }
.bg-accent-section { background: var(--accent); color: #fff; }


/* ══════════════════════════════════════════════════
   14. TUTORIAL CARDS & CATEGORY GRID
   ══════════════════════════════════════════════════ */
.tutorial-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
}
.tutorial-card:hover { border-color: var(--primary); box-shadow: var(--shadow); transform: translateY(-2px); }
.tutorial-card .tc-icon {
    width: 44px; height: 44px;
    background: var(--accent-soft); border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.25rem; color: var(--accent);
    margin-bottom: 1rem;
}
.tutorial-card h5 { font-size: .97rem; font-weight: 700; color: var(--accent); margin-bottom: .35rem; }
.tutorial-card p  { font-size: .85rem; color: var(--text-muted); flex: 1; margin-bottom: .75rem; }
.tutorial-card .tc-footer { display: flex; align-items: center; justify-content: space-between; }
.tutorial-card .tc-link { font-size: .85rem; font-weight: 600; color: var(--primary); }

/* Prev/Next nav */
.prev-next-nav {
    display: flex; justify-content: space-between; gap: 1rem;
    padding: 1.5rem 0;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}
.prev-next-btn {
    display: flex; align-items: center; gap: .75rem;
    background: var(--white); border: 1px solid var(--border);
    border-radius: var(--radius); padding: .85rem 1.25rem;
    text-decoration: none; color: var(--text-dark);
    transition: var(--transition); flex: 1; max-width: 48%;
}
.prev-next-btn:hover { border-color: var(--primary); box-shadow: var(--shadow); color: var(--text-dark); }
.prev-next-btn.next-btn { flex-direction: row-reverse; text-align: right; }
.prev-next-btn .pn-label { font-size: .72rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-light); font-weight: 700; display: block; }
.prev-next-btn .pn-title { font-size: .9rem; font-weight: 600; color: var(--accent); }


/* ══════════════════════════════════════════════════
   15. SEARCH
   ══════════════════════════════════════════════════ */
.learn-search-wrap { position: relative; }
.learn-search-form { display: flex; align-items: center; position: relative; }
.search-icon {
    position: absolute; left: .85rem;
    color: var(--text-light); font-size: .9rem;
    pointer-events: none; z-index: 1;
}
.learn-search-input {
    border: 1px solid var(--border); border-radius: var(--radius-sm);
    padding: .4rem .75rem .4rem 2.25rem;
    font-size: .88rem; font-family: 'Inter', sans-serif;
    background: var(--bg); color: var(--text-dark);
    width: 240px; transition: var(--transition);
}
.learn-search-input:focus {
    outline: none; width: 300px;
    border-color: var(--primary); background: var(--white);
    box-shadow: 0 0 0 3px rgba(230,152,41,.12);
}
.search-results-dropdown {
    position: absolute; top: calc(100% + .5rem); left: 0;
    width: 340px; background: var(--white);
    border: 1px solid var(--border); border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    z-index: 2000; max-height: 420px; overflow-y: auto;
}
.search-result-item {
    display: flex; align-items: flex-start; gap: .75rem;
    padding: .75rem 1rem; cursor: pointer; transition: var(--transition);
    border-bottom: 1px solid var(--border-soft);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--primary-light); }
.search-result-item .sr-icon { color: var(--primary); font-size: .9rem; margin-top: .1rem; flex-shrink: 0; }
.search-result-item .sr-title { font-size: .9rem; font-weight: 600; color: var(--text-dark); }
.search-result-item .sr-path { font-size: .77rem; color: var(--text-light); }
.search-no-results { padding: 1rem; text-align: center; color: var(--text-muted); font-size: .88rem; }

.learn-mobile-search { padding: .5rem 0 .75rem; border-top: 1px solid var(--border); }


/* ══════════════════════════════════════════════════
   16. BREADCRUMBS
   ══════════════════════════════════════════════════ */
.learn-breadcrumb { display: flex; align-items: center; flex-wrap: wrap; gap: .25rem; list-style: none; padding: 0; margin: 0; font-size: .83rem; }
.learn-breadcrumb li { display: flex; align-items: center; gap: .25rem; }
.learn-breadcrumb li + li::before { content: '/'; color: var(--text-light); }
.learn-breadcrumb a { color: var(--text-muted); }
.learn-breadcrumb a:hover { color: var(--primary); }
.learn-breadcrumb .active { color: var(--text-dark); font-weight: 500; }


/* ══════════════════════════════════════════════════
   17. PAGINATION / PREV-NEXT (already in section 14)
   ══════════════════════════════════════════════════ */


/* ══════════════════════════════════════════════════
   18. FOOTER
   ══════════════════════════════════════════════════ */
.learn-footer {
    background: var(--accent);
    color: rgba(255,255,255,.8);
    padding: 4rem 0 0;
}
.learn-footer .footer-brand { font-size: 1.5rem; font-weight: 800; }
.learn-footer .footer-brand .brand-ruban { color: rgba(255,255,255,.9); }
.learn-footer .footer-brand .brand-learn { color: var(--primary); }
.learn-footer .footer-desc { font-size: .88rem; color: rgba(255,255,255,.55); margin-top: .75rem; line-height: 1.7; }
.learn-footer .footer-heading {
    display: block; font-size: .72rem; font-weight: 700;
    text-transform: uppercase; letter-spacing: 1.5px;
    color: rgba(255,255,255,.5); margin-bottom: 1rem;
}
.learn-footer .footer-links { list-style: none; padding: 0; margin: 0; }
.learn-footer .footer-links li { margin-bottom: .4rem; }
.learn-footer .footer-links a {
    color: rgba(255,255,255,.65); font-size: .88rem;
    display: flex; align-items: center; gap: .4rem; transition: var(--transition);
}
.learn-footer .footer-links a:hover { color: var(--primary); }
.learn-footer .footer-links a i { font-size: .7rem; }
.footer-trust { display: flex; flex-wrap: wrap; gap: .5rem; }
.trust-pill {
    font-size: .75rem; background: rgba(255,255,255,.08);
    border: 1px solid rgba(255,255,255,.15);
    border-radius: 20px; padding: .25rem .75rem;
    color: rgba(255,255,255,.75); display: flex; align-items: center; gap: .35rem;
}
.trust-pill i { color: var(--success); font-size: .75rem; }
.footer-bottom {
    margin-top: 3rem;
    border-top: 1px solid rgba(255,255,255,.1);
    padding: 1.5rem 0;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: .75rem;
    font-size: .82rem; color: rgba(255,255,255,.45);
}
.footer-made i { font-size: .8rem; }


/* ══════════════════════════════════════════════════
   19. BACK TO TOP
   ══════════════════════════════════════════════════ */
.back-to-top {
    position: fixed; bottom: 1.5rem; right: 1.5rem;
    background: var(--accent); color: #fff;
    border: none; border-radius: 50%;
    width: 44px; height: 44px;
    display: flex; align-items: center; justify-content: center;
    font-size: 1rem; cursor: pointer; z-index: 999;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    opacity: .85;
}
.back-to-top:hover { background: var(--primary); opacity: 1; transform: translateY(-2px); }


/* ══════════════════════════════════════════════════
   20. RESPONSIVE OVERRIDES
   ══════════════════════════════════════════════════ */

/* Tablet */
@media (max-width: 1199px) {
    .tutorial-layout {
        grid-template-columns: var(--learn-sidebar-w) 1fr;
        grid-template-areas: "sidebar content";
    }
    .tutorial-layout .layout-toc { display: none; }
}

@media (max-width: 991px) {
    .tutorial-layout {
        grid-template-columns: 1fr;
        grid-template-areas: "content";
    }
    .tutorial-layout .layout-sidebar {
        display: none; /* shown via JS offcanvas on mobile */
        position: fixed;
        top: var(--learn-navbar-h);
        left: 0;
        width: var(--learn-sidebar-w);
        height: calc(100vh - var(--learn-navbar-h));
        z-index: 1040;
        box-shadow: var(--shadow-md);
    }
    .tutorial-layout .layout-sidebar.mobile-open { display: block; }
    .tutorial-layout .layout-content { padding: 1.5rem 1rem 3rem; }
    .sidebar-mobile-toggle { display: flex; }

    .learn-navbar { height: auto; padding: .75rem 0; }
}

@media (max-width: 767px) {
    .learn-homepage-hero { padding: 3rem 0 2.5rem; }
    .prev-next-nav { flex-direction: column; }
    .prev-next-btn, .prev-next-btn.next-btn { max-width: 100%; }
    .footer-bottom { flex-direction: column; text-align: center; }
    .learn-stats-strip .row { gap: .5rem; }
}

@media (max-width: 575px) {
    .tutorial-layout .layout-content { padding: 1.25rem .85rem 2.5rem; }
    .code-block-wrap pre[class*="language-"] { font-size: .8rem; }
}