/* ==========================================================================
   assets/css/content.css
   GFG-Style Content Reading Module — Full Stylesheet
   Supports RTL/Urdu, responsive, dark header strip, three-column article layout
   ========================================================================== */

/* ------------------------------------------------------------------ */
/*  Design Tokens (extends style.css :root)                           */
/* ------------------------------------------------------------------ */
:root {
    --content-sidebar-w: 272px;
    --content-toc-w: 240px;
    --content-header-h: 46px;
    --content-green: #308d46;
    --content-green-light: #e8f5e9;
    --content-green-dark: #1b5e20;
    --content-link: #0056b3;
    --content-code-bg: #f5f7f9;
    --content-code-border: #e1e7ed;
    --content-sidebar-bg: #f8fafb;
    --content-sidebar-active: #e3f2fd;
    --content-sidebar-hover: #eef3f9;
    --content-breadcrumb-bg: #f0f4f8;
}

/* ------------------------------------------------------------------ */
/*  Content Header Strip (sub-navigation like GFG)                    */
/* ------------------------------------------------------------------ */
.content-header-strip {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border-bottom: 3px solid var(--content-green);
    padding: 0;
    position: sticky;
    top: 76px;
    z-index: 900;
}

.content-header-inner {
    display: flex;
    align-items: center;
    gap: 0;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.content-header-inner::-webkit-scrollbar {
    display: none;
}

.content-header-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 18px;
    font-size: 13.5px;
    font-weight: 500;
    color: #cbd5e1;
    white-space: nowrap;
    transition: color 0.2s, background 0.2s;
    border-bottom: 3px solid transparent;
    margin-bottom: -3px;
}

.content-header-link:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.06);
}

.content-header-link.active {
    color: #ffffff;
    border-bottom-color: var(--content-green);
    background: rgba(255, 255, 255, 0.08);
}

.content-header-link i {
    font-size: 12px;
}

/* ------------------------------------------------------------------ */
/*  Breadcrumb Bar                                                    */
/* ------------------------------------------------------------------ */
.content-breadcrumb {
    background: var(--content-breadcrumb-bg);
    border-bottom: 1px solid #dce4ed;
    padding: 10px 0;
}

.content-breadcrumb-inner {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 13px;
    color: var(--muted);
}

.content-breadcrumb-inner a {
    color: var(--content-link);
    font-weight: 500;
    transition: color 0.15s;
}

.content-breadcrumb-inner a:hover {
    color: var(--content-green-dark);
    text-decoration: underline;
}

.content-breadcrumb-inner .sep {
    color: #94a3b8;
    font-size: 11px;
}

.content-breadcrumb-inner .current {
    color: var(--dark);
    font-weight: 600;
}

/* ------------------------------------------------------------------ */
/*  Browse Page — Filter Bar & Subject Grid                           */
/* ------------------------------------------------------------------ */
.content-browse-hero {
    padding: 52px 0 44px;
    background:
        radial-gradient(circle at 10% 20%, rgba(48, 141, 70, 0.2), transparent 40%),
        radial-gradient(circle at 90% 10%, rgba(37, 99, 235, 0.15), transparent 36%),
        linear-gradient(160deg, #0b152d 0%, #0f2451 48%, #12306b 100%);
    color: #ffffff;
}

.content-browse-hero h1 {
    font-size: clamp(26px, 4vw, 38px);
    line-height: 1.2;
}

.content-browse-hero p {
    margin-top: 8px;
    color: #c9d9f4;
    max-width: 60ch;
}

/* Search bar */
.content-search-bar {
    margin-top: 22px;
    display: flex;
    max-width: 560px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.content-search-bar input {
    flex: 1;
    padding: 14px 18px;
    border: none;
    font-size: 15px;
    font-family: inherit;
    outline: none;
    background: #ffffff;
    color: var(--dark);
}

.content-search-bar input::placeholder {
    color: #94a3b8;
}

.content-search-bar button {
    padding: 14px 22px;
    border: none;
    background: var(--content-green);
    color: #ffffff;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.2s;
}

.content-search-bar button:hover {
    background: var(--content-green-dark);
}

/* Filter row */
.content-filter-bar {
    padding: 18px 0;
    background: #ffffff;
    border-bottom: 1px solid #e2e8f0;
}

.content-filter-row {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

.content-filter-row label {
    font-size: 13px;
    font-weight: 600;
    color: var(--dark);
}

.content-filter-row select {
    padding: 10px 14px;
    border: 1px solid #cbd5e1;
    border-radius: 10px;
    font-size: 14px;
    font-family: inherit;
    background: #ffffff;
    color: var(--dark);
    cursor: pointer;
    min-width: 160px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.content-filter-row select:focus {
    outline: none;
    border-color: var(--content-green);
    box-shadow: 0 0 0 3px rgba(48, 141, 70, 0.15);
}

/* Subject cards grid */
.content-subject-grid {
    padding: 36px 0 60px;
}

.content-subject-grid .section-title {
    margin-bottom: 28px;
}

.content-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 18px;
}

.content-subject-card {
    border: 1px solid #dee8f4;
    border-radius: 16px;
    padding: 22px 20px;
    background: #ffffff;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.content-subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--content-green);
    border-radius: 16px 0 0 16px;
    opacity: 0;
    transition: opacity 0.2s;
}

.content-subject-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.1);
}

.content-subject-card:hover::before {
    opacity: 1;
}

.content-subject-card h3 {
    font-size: 18px;
    color: var(--dark);
    line-height: 1.3;
    margin-bottom: 8px;
}

.content-subject-card .card-meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    color: var(--muted);
}

.content-subject-card .card-meta i {
    color: var(--content-green);
    margin-right: 4px;
}

.content-subject-card .card-summary {
    margin-top: 10px;
    font-size: 14px;
    color: var(--muted);
    line-height: 1.5;
}

/* Search results area */
.content-search-results {
    padding: 36px 0 60px;
}

.content-search-results h2 {
    margin-bottom: 18px;
    color: var(--dark);
}

.content-result-item {
    border: 1px solid #e2ebf7;
    border-radius: 12px;
    padding: 18px 20px;
    background: #ffffff;
    margin-bottom: 12px;
    transition: box-shadow 0.2s;
}

.content-result-item:hover {
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.08);
}

.content-result-item h3 {
    font-size: 17px;
    color: var(--content-link);
    margin-bottom: 6px;
}

.content-result-item h3 a {
    color: inherit;
    transition: color 0.15s;
}

.content-result-item h3 a:hover {
    color: var(--content-green);
}

.content-result-item p {
    font-size: 14px;
    color: var(--muted);
    line-height: 1.5;
}

.content-no-results {
    text-align: center;
    padding: 48px 20px;
    color: var(--muted);
}

.content-no-results i {
    font-size: 48px;
    color: #cbd5e1;
    display: block;
    margin-bottom: 14px;
}

/* ------------------------------------------------------------------ */
/*  Subject Landing — Chapter Sidebar + Articles                      */
/* ------------------------------------------------------------------ */
.content-subject-layout {
    display: grid;
    grid-template-columns: var(--content-sidebar-w) 1fr;
    gap: 0;
    min-height: 70vh;
}

.content-chapter-sidebar {
    background: var(--content-sidebar-bg);
    border-right: 1px solid #e0e8f1;
    padding: 18px 0;
    position: sticky;
    top: 122px;
    height: calc(100vh - 122px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #c5cdd8 transparent;
}

.content-chapter-sidebar::-webkit-scrollbar {
    width: 5px;
}

.content-chapter-sidebar::-webkit-scrollbar-thumb {
    background: #c5cdd8;
    border-radius: 3px;
}

.content-sidebar-title {
    padding: 8px 20px 12px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #64748b;
}

.content-chapter-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.content-chapter-item {
    border-bottom: 1px solid #eef2f6;
}

.content-chapter-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 11px 20px;
    border: none;
    background: transparent;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    color: var(--dark);
    cursor: pointer;
    text-align: left;
    transition: background 0.15s, color 0.15s;
}

.content-chapter-toggle:hover {
    background: var(--content-sidebar-hover);
}

.content-chapter-toggle.active {
    background: var(--content-sidebar-active);
    color: var(--primary);
}

.content-chapter-toggle .arrow {
    font-size: 10px;
    transition: transform 0.2s;
    color: #94a3b8;
}

.content-chapter-toggle.active .arrow {
    transform: rotate(180deg);
    color: var(--primary);
}

.content-article-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
}

.content-article-list.open {
    display: block;
}

.content-article-link {
    display: block;
    padding: 9px 20px 9px 36px;
    font-size: 13.5px;
    color: #475569;
    border-left: 3px solid transparent;
    transition: all 0.15s;
}

.content-article-link:hover {
    background: var(--content-sidebar-hover);
    color: var(--content-green);
}

.content-article-link.current {
    border-left-color: var(--content-green);
    background: #e8f5e9;
    color: var(--content-green-dark);
    font-weight: 600;
}

/* Subject main area */
.content-subject-main {
    padding: 28px 32px 60px;
}

.content-chapter-section {
    margin-bottom: 36px;
}

.content-chapter-section h2 {
    font-size: 22px;
    color: var(--dark);
    padding-bottom: 10px;
    border-bottom: 2px solid var(--content-green);
    margin-bottom: 14px;
    display: inline-block;
}

.content-article-cards {
    display: grid;
    gap: 12px;
}

.content-article-row {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border: 1px solid #e8eef5;
    border-radius: 10px;
    background: #ffffff;
    transition: box-shadow 0.2s, transform 0.15s;
}

.content-article-row:hover {
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.06);
    transform: translateX(4px);
}

.content-article-row .article-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--content-green-light);
    color: var(--content-green);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 14px;
}

.content-article-row .article-info {
    flex: 1;
    min-width: 0;
}

.content-article-row .article-info h4 {
    font-size: 15px;
    color: var(--dark);
    margin: 0;
    line-height: 1.4;
}

.content-article-row .article-info h4 a {
    color: inherit;
    transition: color 0.15s;
}

.content-article-row .article-info h4 a:hover {
    color: var(--content-green);
}

.content-article-row .article-info .article-meta-small {
    font-size: 12px;
    color: #94a3b8;
    margin-top: 2px;
}

/* ------------------------------------------------------------------ */
/*  Article Page — GFG Three-Column Layout                            */
/* ------------------------------------------------------------------ */
.content-article-layout {
    display: grid;
    grid-template-columns: var(--content-sidebar-w) 1fr var(--content-toc-w);
    gap: 0;
    min-height: 70vh;
}

/* Reading progress bar */
.content-reading-progress {
    position: fixed;
    top: 76px;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--content-green), #2196f3);
    z-index: 999;
    transition: width 0.1s linear;
}

/* Article main content area */
.content-article-main {
    padding: 28px 36px 60px;
    border-left: 1px solid #e8eef5;
    border-right: 1px solid #e8eef5;
    max-width: 100%;
    overflow-x: hidden;
}

.content-article-meta {
    display: flex;
    align-items: center;
    gap: 18px;
    margin-bottom: 18px;
    font-size: 13px;
    color: #64748b;
    flex-wrap: wrap;
}

.content-article-meta i {
    margin-right: 4px;
    color: #94a3b8;
}

.content-article-meta .meta-divider {
    width: 1px;
    height: 16px;
    background: #d1d5db;
}

.content-article-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

.content-article-actions button {
    padding: 6px 10px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    background: #ffffff;
    color: #64748b;
    cursor: pointer;
    font-size: 13px;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all 0.15s;
}

.content-article-actions button:hover {
    border-color: var(--content-green);
    color: var(--content-green);
}

/* Article title */
.content-article-main h1 {
    font-size: clamp(24px, 3.5vw, 32px);
    line-height: 1.3;
    color: var(--dark);
    margin-bottom: 6px;
}

.content-article-title-urdu {
    font-family: 'Noto Nastaliq Urdu', serif;
    direction: rtl;
    text-align: right;
    font-size: clamp(20px, 3vw, 28px);
    line-height: 2;
    color: var(--dark);
    margin-bottom: 18px;
}

/* Article body — rich content typography */
.content-article-body {
    font-size: 16px;
    line-height: 1.8;
    color: #334155;
}

.content-article-body[dir="rtl"] {
    font-family: 'Noto Nastaliq Urdu', serif;
    direction: rtl;
    text-align: right;
    line-height: 2.4;
}

.content-article-body h2 {
    font-size: 24px;
    color: var(--dark);
    margin: 32px 0 14px;
    padding-bottom: 8px;
    border-bottom: 2px solid #e8eef5;
}

.content-article-body h3 {
    font-size: 20px;
    color: var(--dark);
    margin: 24px 0 10px;
}

.content-article-body h4 {
    font-size: 17px;
    color: #1e293b;
    margin: 18px 0 8px;
}

.content-article-body p {
    margin: 12px 0;
}

.content-article-body a {
    color: var(--content-link);
    text-decoration: underline;
    text-decoration-color: rgba(0, 86, 179, 0.3);
    text-underline-offset: 2px;
    transition: color 0.15s;
}

.content-article-body a:hover {
    color: var(--content-green);
}

.content-article-body ul,
.content-article-body ol {
    margin: 12px 0;
    padding-left: 24px;
}

.content-article-body[dir="rtl"] ul,
.content-article-body[dir="rtl"] ol {
    padding-left: 0;
    padding-right: 24px;
}

.content-article-body li {
    margin-bottom: 6px;
}

.content-article-body img {
    max-width: 100%;
    height: auto;
    border-radius: 10px;
    margin: 16px 0;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.content-article-body blockquote {
    margin: 16px 0;
    padding: 14px 20px;
    border-left: 4px solid var(--content-green);
    background: #f0fdf4;
    border-radius: 0 8px 8px 0;
    color: #166534;
    font-style: italic;
}

.content-article-body[dir="rtl"] blockquote {
    border-left: none;
    border-right: 4px solid var(--content-green);
    border-radius: 8px 0 0 8px;
}

.content-article-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.content-article-body th,
.content-article-body td {
    padding: 10px 14px;
    border: 1px solid #e2e8f0;
    text-align: left;
}

.content-article-body[dir="rtl"] th,
.content-article-body[dir="rtl"] td {
    text-align: right;
}

.content-article-body th {
    background: #f1f5f9;
    font-weight: 600;
    color: var(--dark);
}

.content-article-body tr:nth-child(even) td {
    background: #fafbfc;
}

/* Code blocks — GFG style */
.content-article-body pre {
    position: relative;
    margin: 16px 0;
    padding: 18px 20px;
    background: #263238;
    color: #eeffff;
    border-radius: 10px;
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 14px;
    line-height: 1.65;
    overflow-x: auto;
    tab-size: 4;
}

.content-article-body code {
    font-family: 'Fira Code', 'Cascadia Code', 'Consolas', monospace;
    font-size: 0.9em;
}

.content-article-body :not(pre) > code {
    padding: 2px 7px;
    background: var(--content-code-bg);
    border: 1px solid var(--content-code-border);
    border-radius: 4px;
    color: #e53e3e;
    font-size: 0.88em;
}

/* Copy button on code blocks */
.code-copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 5px 10px;
    border: none;
    border-radius: 5px;
    background: rgba(255, 255, 255, 0.12);
    color: #b0bec5;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
    font-family: inherit;
}

.code-copy-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

.code-copy-btn.copied {
    background: var(--content-green);
    color: #ffffff;
}

/* Note/Tip/Important boxes (GFG-style) */
.content-note {
    padding: 14px 18px;
    margin: 16px 0;
    border-radius: 10px;
    font-size: 14px;
    line-height: 1.6;
}

.content-note-info {
    background: #eff6ff;
    border-left: 4px solid #3b82f6;
    color: #1e40af;
}

.content-note-tip {
    background: #f0fdf4;
    border-left: 4px solid var(--content-green);
    color: var(--content-green-dark);
}

.content-note-warning {
    background: #fffbeb;
    border-left: 4px solid #f59e0b;
    color: #92400e;
}

.content-note strong {
    display: block;
    margin-bottom: 4px;
}

/* ------------------------------------------------------------------ */
/*  Right Sidebar — Table of Contents (Sticky)                        */
/* ------------------------------------------------------------------ */
.content-toc-sidebar {
    padding: 24px 16px;
    position: sticky;
    top: 122px;
    height: calc(100vh - 122px);
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #c5cdd8 transparent;
    background: #fafcfe;
}

.content-toc-sidebar::-webkit-scrollbar {
    width: 4px;
}

.content-toc-sidebar::-webkit-scrollbar-thumb {
    background: #d1d5db;
    border-radius: 3px;
}

.content-toc-title {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: #64748b;
    padding-bottom: 10px;
    border-bottom: 1px solid #e8eef5;
    margin-bottom: 10px;
}

.content-toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.content-toc-list li {
    margin: 0;
}

.content-toc-list a {
    display: block;
    padding: 7px 12px;
    font-size: 13px;
    color: #64748b;
    border-left: 2px solid transparent;
    transition: all 0.15s;
    line-height: 1.4;
}

.content-toc-list a:hover {
    color: var(--content-green);
    background: rgba(48, 141, 70, 0.04);
}

.content-toc-list a.active {
    color: var(--content-green-dark);
    border-left-color: var(--content-green);
    background: rgba(48, 141, 70, 0.06);
    font-weight: 600;
}

.content-toc-list a.toc-h3 {
    padding-left: 24px;
    font-size: 12.5px;
}

/* ------------------------------------------------------------------ */
/*  Previous / Next Navigation                                        */
/* ------------------------------------------------------------------ */
.content-prev-next {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 40px;
    padding-top: 28px;
    border-top: 1px solid #e8eef5;
}

.content-prev-next a {
    display: flex;
    flex-direction: column;
    padding: 16px 18px;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    background: #ffffff;
    transition: box-shadow 0.2s, transform 0.15s;
}

.content-prev-next a:hover {
    box-shadow: 0 6px 18px rgba(15, 23, 42, 0.08);
    transform: translateY(-2px);
}

.content-prev-next .nav-label {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #94a3b8;
    margin-bottom: 4px;
}

.content-prev-next .nav-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--content-green);
}

.content-prev-next .nav-next {
    text-align: right;
}

/* Related articles */
.content-related {
    margin-top: 36px;
    padding-top: 24px;
    border-top: 1px solid #e8eef5;
}

.content-related h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 14px;
}

.content-related-list {
    display: grid;
    gap: 10px;
}

.content-related-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border: 1px solid #eef2f6;
    border-radius: 8px;
    background: #ffffff;
    transition: background 0.15s;
}

.content-related-item:hover {
    background: #f8fafb;
}

.content-related-item i {
    color: var(--content-green);
    font-size: 12px;
    flex-shrink: 0;
}

.content-related-item a {
    font-size: 14px;
    color: var(--content-link);
    font-weight: 500;
}

.content-related-item a:hover {
    color: var(--content-green);
}

/* ------------------------------------------------------------------ */
/*  Mobile Sidebar Toggle Button                                      */
/* ------------------------------------------------------------------ */
.content-sidebar-toggle {
    display: none;
    position: fixed;
    bottom: 20px;
    left: 20px;
    z-index: 1100;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: var(--content-green);
    color: #ffffff;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 6px 18px rgba(48, 141, 70, 0.35);
    transition: transform 0.2s;
}

.content-sidebar-toggle:hover {
    transform: scale(1.08);
}

/* Overlay for mobile sidebar */
.content-sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 1050;
}

.content-sidebar-overlay.visible {
    display: block;
}

/* ------------------------------------------------------------------ */
/*  RTL Helpers                                                       */
/* ------------------------------------------------------------------ */
.rtl-text {
    font-family: 'Noto Nastaliq Urdu', serif;
    direction: rtl;
    text-align: right;
    line-height: 2.2;
}

.content-subject-card.rtl-card h3 {
    font-family: 'Noto Nastaliq Urdu', serif;
    direction: rtl;
    text-align: right;
    line-height: 2;
}

/* ------------------------------------------------------------------ */
/*  Empty State                                                       */
/* ------------------------------------------------------------------ */
.content-empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--muted);
}

.content-empty-state i {
    font-size: 56px;
    color: #d1d5db;
    margin-bottom: 16px;
    display: block;
}

.content-empty-state h3 {
    color: var(--dark);
    margin-bottom: 6px;
}

/* ------------------------------------------------------------------ */
/*  MCQ Practice Page                                                 */
/* ------------------------------------------------------------------ */
.mcq-practice-hero {
    background:
        radial-gradient(circle at 12% 18%, rgba(34, 197, 94, 0.22), transparent 36%),
        radial-gradient(circle at 86% 12%, rgba(14, 165, 233, 0.18), transparent 34%),
        linear-gradient(150deg, #071424 0%, #10263f 52%, #17395d 100%);
}

.mcq-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 28px;
    align-items: center;
}

.mcq-hero-panel {
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 14px;
    padding: 22px;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.18);
}

.mcq-panel-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #b8d7ff;
}

.mcq-hero-panel strong {
    display: block;
    margin-top: 6px;
    font-size: 44px;
    line-height: 1;
    color: #ffffff;
}

.mcq-hero-panel p {
    margin-top: 8px;
    color: #d8e8fb;
    font-size: 14px;
}

.mcq-filter-row input[type="hidden"] {
    display: none;
}

.mcq-practice-section {
    padding: 32px 0 64px;
    background: #f8fafc;
}

.mcq-summary-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 22px;
}

.mcq-summary-strip div {
    border: 1px solid #e1e8f0;
    border-radius: 12px;
    padding: 14px 16px;
    background: #ffffff;
}

.mcq-summary-strip span {
    display: block;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    color: #64748b;
    margin-bottom: 4px;
}

.mcq-summary-strip strong {
    display: block;
    font-size: 15px;
    color: var(--dark);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.mcq-result-note {
    margin-bottom: 14px;
    color: #64748b;
    font-size: 14px;
}

.mcq-practice-list {
    display: grid;
    gap: 16px;
}

.mcq-practice-card {
    border: 1px solid #dfe8f3;
    border-radius: 14px;
    padding: 22px;
    background: #ffffff;
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.mcq-card-topline {
    display: flex;
    justify-content: space-between;
    gap: 14px;
    align-items: center;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.mcq-number {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border-radius: 999px;
    background: #e8f5e9;
    color: var(--content-green-dark);
    font-size: 12px;
    font-weight: 700;
}

.mcq-topic {
    color: #64748b;
    font-size: 13px;
    font-weight: 500;
}

.mcq-topic i {
    margin: 0 5px;
    color: #94a3b8;
}

.mcq-practice-card h2 {
    font-size: 18px;
    line-height: 1.55;
    color: #172033;
    margin-bottom: 16px;
}

.mcq-options-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
}

.mcq-option-btn {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    width: 100%;
    min-height: 54px;
    padding: 12px 14px;
    border: 1px solid #d8e2ef;
    border-radius: 10px;
    background: #ffffff;
    color: #263445;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.45;
    text-align: left;
    cursor: pointer;
    transition: border-color 0.16s, box-shadow 0.16s, background 0.16s;
}

.mcq-option-btn:hover:not(:disabled) {
    border-color: var(--content-green);
    box-shadow: 0 8px 18px rgba(48, 141, 70, 0.12);
}

.mcq-option-btn:disabled {
    cursor: default;
    opacity: 1;
}

.mcq-option-letter {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #edf2f7;
    color: #475569;
    font-size: 12px;
    font-weight: 800;
    flex: 0 0 28px;
}

.mcq-option-text {
    min-width: 0;
    overflow-wrap: anywhere;
}

.mcq-option-btn.is-correct {
    border-color: #22c55e;
    background: #effdf4;
    color: #14532d;
}

.mcq-option-btn.is-correct .mcq-option-letter {
    background: #22c55e;
    color: #ffffff;
}

.mcq-option-btn.is-wrong {
    border-color: #ef4444;
    background: #fff1f2;
    color: #7f1d1d;
}

.mcq-option-btn.is-wrong .mcq-option-letter {
    background: #ef4444;
    color: #ffffff;
}

.mcq-answer-feedback {
    display: none;
    margin-top: 14px;
    padding: 11px 13px;
    border-radius: 10px;
    font-size: 14px;
    background: #f1f5f9;
    color: #475569;
}

.mcq-answer-feedback.visible {
    display: block;
}

.mcq-answer-feedback.is-success {
    background: #ecfdf5;
    color: #166534;
}

.mcq-answer-feedback.is-error {
    background: #fff7ed;
    color: #9a3412;
}

/* ------------------------------------------------------------------ */
/*  Previous Year Papers Page                                         */
/* ------------------------------------------------------------------ */
.paper-library-hero {
    background:
        radial-gradient(circle at 14% 16%, rgba(239, 68, 68, 0.18), transparent 34%),
        radial-gradient(circle at 86% 14%, rgba(34, 197, 94, 0.16), transparent 34%),
        linear-gradient(150deg, #0d1728 0%, #17314f 52%, #254464 100%);
}

.paper-hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 28px;
    align-items: center;
}

.paper-hero-panel {
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 14px;
    padding: 22px;
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.18);
}

.paper-hero-panel span {
    display: block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #cfe5ff;
}

.paper-hero-panel strong {
    display: block;
    margin-top: 6px;
    font-size: 44px;
    line-height: 1;
    color: #ffffff;
}

.paper-hero-panel p {
    margin-top: 8px;
    color: #d8e8fb;
    font-size: 14px;
}

.paper-library-section {
    padding: 32px 0 64px;
    background: #f8fafc;
}

.paper-summary-strip {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
    margin-bottom: 22px;
}

.paper-summary-strip div {
    border: 1px solid #e1e8f0;
    border-radius: 12px;
    padding: 14px 16px;
    background: #ffffff;
}

.paper-summary-strip span {
    display: block;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.7px;
    color: #64748b;
    margin-bottom: 4px;
}

.paper-summary-strip strong {
    display: block;
    font-size: 15px;
    color: var(--dark);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.paper-result-note {
    margin-bottom: 14px;
    color: #64748b;
    font-size: 14px;
}

.paper-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.paper-card {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 14px;
    border: 1px solid #dfe8f3;
    border-radius: 14px;
    padding: 18px;
    background: #ffffff;
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.06);
}

.paper-card-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: #fef2f2;
    color: #dc2626;
    font-size: 21px;
}

.paper-card-body {
    min-width: 0;
}

.paper-card-meta {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.paper-card-meta span {
    padding: 4px 8px;
    border-radius: 999px;
    background: #eef6ff;
    color: #1d4ed8;
    font-size: 12px;
    font-weight: 700;
}

.paper-card h2 {
    font-size: 17px;
    line-height: 1.35;
    color: #172033;
    margin-bottom: 6px;
}

.paper-card p {
    color: #64748b;
    font-size: 13px;
    overflow-wrap: anywhere;
}

.paper-card-actions {
    grid-column: 1 / -1;
    display: flex;
    gap: 10px;
    margin-top: 4px;
}

.paper-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 40px;
    padding: 9px 14px;
    border-radius: 9px;
    font-size: 14px;
    font-weight: 700;
}

.paper-btn-open {
    border: 1px solid #cbd5e1;
    color: #334155;
    background: #ffffff;
}

.paper-btn-download {
    border: 1px solid var(--content-green);
    color: #ffffff;
    background: var(--content-green);
}

.paper-btn-open:hover {
    border-color: var(--content-green);
    color: var(--content-green);
}

.paper-btn-download:hover {
    background: var(--content-green-dark);
}

/* ------------------------------------------------------------------ */
/*  Responsive                                                        */
/* ------------------------------------------------------------------ */
@media (max-width: 1100px) {
    .content-article-layout {
        grid-template-columns: var(--content-sidebar-w) 1fr;
    }

    .content-toc-sidebar {
        display: none;
    }
}

@media (max-width: 900px) {
    .content-article-layout,
    .content-subject-layout {
        grid-template-columns: 1fr;
    }

    .content-chapter-sidebar {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 300px;
        height: 100vh;
        z-index: 1060;
        box-shadow: 6px 0 24px rgba(0, 0, 0, 0.15);
    }

    .content-chapter-sidebar.mobile-open {
        display: block;
    }

    .content-sidebar-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .content-article-main {
        padding: 20px 16px 48px;
    }

    .content-subject-main {
        padding: 20px 16px 48px;
    }

    .content-toc-sidebar {
        display: none;
    }

    .content-prev-next {
        grid-template-columns: 1fr;
    }

    .content-header-strip {
        top: 76px;
    }

    .mcq-hero-grid,
    .mcq-summary-strip,
    .paper-hero-grid,
    .paper-summary-strip {
        grid-template-columns: 1fr;
    }

    .mcq-hero-panel,
    .paper-hero-panel {
        max-width: 360px;
    }
}

@media (max-width: 600px) {
    .content-browse-hero {
        padding: 36px 0 30px;
    }

    .content-search-bar {
        flex-direction: column;
        border-radius: 10px;
    }

    .content-search-bar input {
        border-radius: 10px 10px 0 0;
    }

    .content-search-bar button {
        border-radius: 0 0 10px 10px;
    }

    .content-filter-row {
        flex-direction: column;
        align-items: stretch;
    }

    .content-filter-row select {
        width: 100%;
    }

    .content-cards-grid {
        grid-template-columns: 1fr;
    }

    .mcq-options-grid {
        grid-template-columns: 1fr;
    }

    .mcq-practice-card {
        padding: 18px;
    }

    .paper-card-grid {
        grid-template-columns: 1fr;
    }

    .paper-card-actions {
        flex-direction: column;
    }

    .content-article-meta {
        flex-direction: column;
        gap: 6px;
    }

    .content-article-meta .meta-divider {
        display: none;
    }
}