/* Trang tài liệu công khai (ngữ pháp, IPA, động từ bất quy tắc...) — class ln-* chỉ dùng trong views/web/learn
   Dùng chung biến màu/font của common.css, không phụ thuộc landing.css */

.page-learn main b,
.page-learn main strong {
    font-weight: 600;
}

.lucide {
    display: inline-block;
    flex-shrink: 0;
    vertical-align: middle;
}

.ln-container {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--page-gutter);
}

.ln-section {
    padding-block: 48px;
}

.ln-section + .ln-section {
    padding-top: 0;
}

/* ── Nút ── */
.ln-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 13px 24px;
    border: 0;
    border-radius: 14px;
    font: inherit;
    font-size: .95rem;
    font-weight: 700;
    line-height: 1.2;
    text-align: center;
    cursor: pointer;
    transition: transform .15s ease, background-color .15s ease, border-color .15s ease, color .15s ease;
}

.ln-btn:hover {
    transform: translateY(-2px);
}

.ln-btn:active {
    transform: translateY(1px);
}

.ln-btn-sm {
    padding: 9px 16px;
    border-radius: 12px;
    font-size: .86rem;
}

.ln-btn-primary {
    border-bottom: 4px solid var(--green-dark);
    background: var(--green);
    color: var(--white);
}

.ln-btn-primary:hover {
    background: #4eb802;
}

.ln-btn-outline {
    border: 2px solid var(--border);
    background: var(--white);
    color: var(--text);
}

.ln-btn-outline:hover {
    border-color: var(--green);
    color: var(--green-ink);
}

.ln-btn-white {
    border-bottom: 4px solid #d1d5db;
    background: var(--white);
    color: var(--green-ink);
}

/* ── Tag / chip ── */
.ln-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    border-radius: 100px;
    background: var(--surface);
    color: var(--text-2);
    font-size: .8rem;
    font-weight: 600;
    white-space: nowrap;
}

.ln-tag-green { background: var(--green-pale); color: var(--green-ink); }
.ln-tag-blue { background: var(--blue-pale); color: #0369a1; }
.ln-tag-yellow { background: var(--yellow-pale); color: #b45309; }
.ln-tag-purple { background: var(--purple-pale); color: #7e22ce; }
.ln-tag-red { background: var(--red-pale); color: #be123c; }

.ln-ico {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 12px;
}

.ln-ico-green { background: var(--green-pale); color: var(--green-ink); }
.ln-ico-blue { background: var(--blue-pale); color: #0284c7; }
.ln-ico-yellow { background: var(--yellow-pale); color: #d97706; }
.ln-ico-purple { background: var(--purple-pale); color: #9333ea; }
.ln-ico-red { background: var(--red-pale); color: #e11d48; }

/* ── Hero đầu trang ── */
.ln-hero {
    padding: 104px 0 40px;
    border-bottom: 1px solid var(--border);
    background:
        radial-gradient(circle at 12% 0%, rgba(88, 204, 2, .1), transparent 40%),
        radial-gradient(circle at 92% 10%, rgba(28, 176, 246, .08), transparent 36%),
        var(--white);
}

.ln-breadcrumb {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 4px;
    margin-bottom: 18px;
    color: var(--text-3);
    font-size: .82rem;
    list-style: none;
}

.ln-breadcrumb a {
    color: var(--text-2);
    font-weight: 600;
}

.ln-breadcrumb a:hover {
    color: var(--green-ink);
}

.ln-breadcrumb li {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.ln-kicker {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
    color: var(--green-ink);
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.ln-kicker::before {
    width: 18px;
    height: 3px;
    border-radius: 2px;
    background: currentColor;
    content: "";
}

.ln-hero h1 {
    max-width: 820px;
    margin-bottom: 14px;
    color: var(--text);
    font-size: clamp(1.8rem, 4vw, 2.7rem);
    font-weight: 700;
    letter-spacing: -.8px;
    line-height: 1.18;
}

.ln-lead {
    max-width: 760px;
    color: var(--text-2);
    font-size: 1.04rem;
    line-height: 1.75;
}

.ln-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}

.ln-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 24px;
}

/* ── Tiêu đề khối ── */
.ln-block-head {
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.ln-block-head h2 {
    color: var(--text);
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -.4px;
    line-height: 1.25;
}

.ln-block-head p {
    margin-top: 6px;
    color: var(--text-2);
    font-size: .92rem;
    line-height: 1.6;
}

/* ── Ô tìm kiếm ── */
.ln-search {
    position: relative;
    max-width: 420px;
    margin-top: 24px;
}

.ln-search .lucide {
    position: absolute;
    top: 50%;
    left: 14px;
    color: var(--text-3);
    transform: translateY(-50%);
    pointer-events: none;
}

.ln-search input {
    width: 100%;
    height: 48px;
    padding: 0 16px 0 42px;
    border: 2px solid var(--border);
    border-radius: 14px;
    background: var(--white);
    color: var(--text);
    font-size: .95rem;
    font-weight: 600;
    outline: none;
    transition: border-color .15s ease;
}

.ln-search input:focus {
    border-color: var(--green);
}

.ln-block-gap {
    margin-top: 40px;
}

.ln-block-gap-sm {
    margin-top: 14px;
}

.ln-search-block {
    display: block;
    margin: 0 0 32px;
}

.ln-try-step {
    margin-bottom: 6px;
    color: var(--text-3);
    font-size: .8rem;
    font-weight: 700;
}

.ln-empty {
    display: none;
    padding: 28px;
    border: 1.5px dashed var(--border);
    border-radius: var(--radius-card);
    color: var(--text-2);
    text-align: center;
}

.ln-empty.is-visible {
    display: block;
}

/* ── Hub: cấp độ → nhóm → thẻ bài ── */
.ln-level {
    margin-bottom: 48px;
    scroll-margin-top: 80px;
}

.ln-level-head {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.ln-level-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 76px;
    padding: 8px 12px;
    border-radius: 12px;
    background: var(--green);
    color: var(--white);
    font-size: .88rem;
    font-weight: 800;
    white-space: nowrap;
}

.ln-level-head h2 {
    color: var(--text);
    font-size: 1.3rem;
    font-weight: 700;
}

.ln-level-head p {
    color: var(--text-2);
    font-size: .88rem;
    line-height: 1.5;
}

.ln-group {
    margin-bottom: 22px;
}

.ln-group h3 {
    margin-bottom: 10px;
    color: var(--text-2);
    font-size: .82rem;
    font-weight: 700;
    letter-spacing: .5px;
    text-transform: uppercase;
}

.ln-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.ln-card {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 16px 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: var(--white);
    transition: border-color .15s ease, transform .15s ease;
}

.ln-card:hover {
    border-color: var(--green-mid);
    transform: translateY(-2px);
}

.ln-card b {
    color: var(--text);
    font-size: .98rem;
    line-height: 1.4;
}

.ln-card small {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--text-3);
    font-size: .78rem;
    font-weight: 600;
}

.ln-level-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 22px;
}

.ln-level-nav a {
    padding: 8px 14px;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    background: var(--white);
    color: var(--text-2);
    font-size: .85rem;
    font-weight: 700;
    transition: border-color .15s ease, color .15s ease;
}

.ln-level-nav a:hover {
    border-color: var(--green);
    color: var(--green-ink);
}

/* ── Bài viết + mục lục ── */
.ln-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 260px;
    gap: 48px;
    align-items: start;
}

/* cột lưới không được nở theo bảng/ảnh rộng bên trong (tràn ngang trên điện thoại) */
.ln-layout > *,
.ln-stack > * {
    min-width: 0;
}

.ln-aside {
    position: sticky;
    top: 88px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.ln-toc {
    padding: 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: var(--white);
}

.ln-toc b {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 10px;
    color: var(--text);
    font-size: .88rem;
}

.ln-toc ol {
    display: flex;
    flex-direction: column;
    gap: 2px;
    max-height: 50vh;
    overflow: auto;
    list-style: none;
}

.ln-toc a {
    display: block;
    padding: 6px 10px;
    border-radius: 8px;
    color: var(--text-2);
    font-size: .84rem;
    line-height: 1.4;
}

.ln-toc a:hover,
.ln-toc a.is-active {
    background: var(--green-pale);
    color: var(--green-ink);
}

.ln-aside-cta {
    padding: 18px;
    border-radius: 16px;
    background: var(--green-pale);
}

.ln-aside-cta p {
    margin-bottom: 12px;
    color: var(--text);
    font-size: .88rem;
    font-weight: 600;
    line-height: 1.5;
}

.ln-aside-cta .ln-btn {
    width: 100%;
}

/* Nội dung soạn từ admin: chỉ style theo thẻ */
.ln-prose {
    color: var(--text);
    font-size: 1.02rem;
    line-height: 1.8;
    overflow-wrap: break-word;
}

.ln-prose > * + * {
    margin-top: 14px;
}

.ln-prose h2 {
    margin-top: 40px;
    padding-top: 8px;
    color: var(--text);
    font-size: 1.45rem;
    font-weight: 700;
    letter-spacing: -.3px;
    line-height: 1.3;
    scroll-margin-top: 84px;
}

.ln-prose h2:first-child {
    margin-top: 0;
}

.ln-prose h3 {
    margin-top: 28px;
    color: var(--text);
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.4;
}

.ln-prose h4,
.ln-prose h5 {
    margin-top: 20px;
    color: var(--text);
    font-size: 1rem;
    font-weight: 700;
}

.ln-prose ul,
.ln-prose ol {
    padding-left: 22px;
}

.ln-prose li + li {
    margin-top: 6px;
}

.ln-prose strong {
    color: var(--text);
}

.ln-prose em {
    color: var(--text-2);
}

.ln-prose del {
    color: #b91c1c;
}

.ln-prose code {
    padding: 2px 6px;
    border-radius: 6px;
    background: var(--surface);
    color: #be123c;
    font-size: .9em;
}

.ln-prose pre {
    padding: 16px 18px;
    border-radius: 14px;
    background: #0f172a;
    color: #e2e8f0;
    font-size: .9rem;
    line-height: 1.7;
    white-space: pre-wrap;
    overflow-x: auto;
}

.ln-prose pre code {
    padding: 0;
    background: none;
    color: inherit;
}

.ln-prose blockquote {
    padding: 14px 18px;
    border-left: 4px solid var(--green);
    border-radius: 0 12px 12px 0;
    background: var(--green-pale);
    color: var(--text);
}

.ln-table-scroll {
    max-width: 100%;
    overflow-x: auto;
    border: 1px solid var(--border);
    border-radius: 14px;
}

.ln-prose table {
    width: 100%;
    border-collapse: collapse;
    font-size: .92rem;
    line-height: 1.55;
}

.ln-prose th,
.ln-prose td {
    min-width: 120px;
    padding: 10px 12px;
    border-right: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    text-align: left;
    vertical-align: top;
}

.ln-prose th:last-child,
.ln-prose td:last-child {
    border-right: 0;
}

.ln-prose tr:last-child td {
    border-bottom: 0;
}

.ln-prose th {
    background: var(--surface);
    font-weight: 700;
}

/* ── Làm thử bài tập ── */
.ln-try {
    margin-top: 48px;
    padding: 28px;
    border: 1.5px solid var(--border);
    border-radius: 24px;
    background: var(--white);
    scroll-margin-top: 84px;
}

.ln-try-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 18px;
}

.ln-try-head h2 {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 1.3rem;
    font-weight: 700;
}

.ln-try-progress {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
}

.ln-try-progress span {
    flex: 1;
    height: 6px;
    border-radius: 6px;
    background: #eef0f3;
}

.ln-try-progress span.is-current { background: var(--blue); }
.ln-try-progress span.is-right { background: var(--green); }
.ln-try-progress span.is-wrong { background: var(--red); }

.ln-q-text {
    margin-bottom: 18px;
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.7;
}

.ln-q-text input {
    width: 140px;
    margin: 2px 4px;
    padding: 6px 10px;
    border: 2px solid var(--border);
    border-bottom-width: 3px;
    border-radius: 10px;
    color: var(--text);
    font: inherit;
    font-weight: 700;
    text-align: center;
    outline: none;
}

.ln-q-text input:focus {
    border-color: var(--blue);
}

.ln-q-text input.is-right { border-color: var(--green); background: var(--green-pale); }
.ln-q-text input.is-wrong { border-color: var(--red); background: var(--red-pale); }

.ln-q-hint {
    margin: -8px 0 16px;
    color: var(--text-2);
    font-size: .88rem;
}

.ln-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.ln-options button {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 13px 16px;
    border: 2px solid var(--border);
    border-bottom-width: 4px;
    border-radius: 14px;
    background: var(--white);
    color: var(--text);
    font: inherit;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    transition: border-color .15s ease, background-color .15s ease;
}

.ln-options button span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: var(--surface);
    color: var(--text-2);
    font-size: .8rem;
    font-weight: 800;
    text-transform: uppercase;
}

.ln-options button:hover:not(:disabled) { border-color: var(--blue); }
.ln-options button.is-picked { border-color: var(--blue); background: var(--blue-pale); }
.ln-options button.is-right { border-color: var(--green); background: var(--green-pale); }
.ln-options button.is-wrong { border-color: var(--red); background: var(--red-pale); }
.ln-options button:disabled { cursor: default; }

.ln-try-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}

.ln-feedback {
    margin-top: 18px;
    padding: 16px 18px;
    border-radius: 14px;
    font-size: .94rem;
    line-height: 1.7;
}

.ln-feedback.is-right { background: var(--green-pale); }
.ln-feedback.is-wrong { background: var(--red-pale); }

.ln-feedback > b {
    display: block;
    margin-bottom: 4px;
}

.ln-feedback.is-right > b { color: var(--green-ink); }
.ln-feedback.is-wrong > b { color: #b91c1c; }

.ln-feedback .ln-explain {
    margin-top: 8px;
    color: var(--text);
}

.ln-try-done {
    padding: 8px 0;
    text-align: center;
}

.ln-try-done b {
    display: block;
    color: var(--text);
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.ln-try-done p {
    margin: 6px 0 18px;
    color: var(--text-2);
}

.ln-try-done .ln-try-actions {
    justify-content: center;
}

/* ── Hộp mời vào app ── */
.ln-cta {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 24px;
    align-items: center;
    margin-top: 40px;
    padding: 28px 32px;
    border-radius: 24px;
    background:
        radial-gradient(circle at 90% 10%, rgba(255, 255, 255, .2), transparent 34%),
        linear-gradient(135deg, var(--green), #2f9e00);
    color: var(--white);
}

.ln-cta h2,
.ln-cta h3 {
    margin-bottom: 6px;
    font-size: 1.3rem;
    font-weight: 700;
    line-height: 1.35;
}

.ln-cta p {
    color: rgba(255, 255, 255, .9);
    font-size: .95rem;
    line-height: 1.6;
}

.ln-cta-points {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 16px;
    margin-top: 10px;
    list-style: none;
}

.ln-cta-points li {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: .86rem;
    font-weight: 600;
}

/* ── Trước / sau ── */
.ln-pager {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 40px;
}

.ln-pager a {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 16px 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    transition: border-color .15s ease;
}

.ln-pager a:hover {
    border-color: var(--green);
}

.ln-pager small {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--text-3);
    font-size: .78rem;
    font-weight: 700;
}

.ln-pager b {
    color: var(--text);
    font-size: .95rem;
    line-height: 1.4;
}

.ln-pager .is-next {
    grid-column: 2;
    text-align: right;
}

.ln-pager .is-next small {
    justify-content: flex-end;
}

.ln-related {
    margin-top: 40px;
}

.ln-related h2 {
    margin-bottom: 14px;
    color: var(--text);
    font-size: 1.15rem;
    font-weight: 700;
}

/* ── Bảng dữ liệu (động từ bất quy tắc) ── */
.ln-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.ln-tabs button {
    padding: 8px 14px;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    background: var(--white);
    color: var(--text-2);
    font: inherit;
    font-size: .85rem;
    font-weight: 700;
    cursor: pointer;
    transition: border-color .15s ease, color .15s ease, background-color .15s ease;
}

.ln-tabs button:hover {
    border-color: var(--green);
}

.ln-tabs button.is-active {
    border-color: var(--green);
    background: var(--green-pale);
    color: var(--green-ink);
}

.ln-group-note {
    display: none;
    margin-bottom: 16px;
    padding: 14px 18px;
    border-radius: 14px;
    background: var(--yellow-pale);
    color: var(--text);
    font-size: .92rem;
    line-height: 1.6;
}

.ln-group-note.is-visible {
    display: block;
}

.ln-table-wrap {
    overflow-x: auto;
    border: 1.5px solid var(--border);
    border-radius: 18px;
    background: var(--white);
}

.ln-table {
    width: 100%;
    min-width: 640px;
    border-collapse: collapse;
    font-size: .95rem;
}

.ln-table th,
.ln-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    text-align: left;
}

.ln-table th {
    position: sticky;
    top: 0;
    background: var(--surface);
    color: var(--text-2);
    font-size: .8rem;
    font-weight: 700;
    letter-spacing: .3px;
    text-transform: uppercase;
}

.ln-table tr:last-child td {
    border-bottom: 0;
}

.ln-table tbody tr:hover {
    background: #fbfdf8;
}

.ln-table a {
    color: var(--text);
    font-weight: 700;
}

.ln-table a:hover {
    color: var(--green-ink);
}

.ln-table .is-v2 { color: #0369a1; font-weight: 700; }
.ln-table .is-v3 { color: #7e22ce; font-weight: 700; }

.ln-ipa-text {
    color: var(--text-3);
    font-size: .85rem;
}

.ln-speak {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border: 0;
    border-radius: 50%;
    background: var(--blue-pale);
    color: #0284c7;
    cursor: pointer;
    transition: transform .15s ease;
    vertical-align: middle;
}

.ln-speak-sm {
    float: right;
    width: 24px;
    height: 24px;
    margin-left: 8px;
}

.ln-more {
    margin-top: 24px;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
}

.ln-speak:hover {
    transform: scale(1.08);
}

.ln-speak.is-playing {
    background: var(--blue);
    color: var(--white);
}

/* ── Chi tiết động từ ── */
.ln-forms {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.ln-form {
    padding: 18px;
    border: 1.5px solid var(--border);
    border-radius: 18px;
    background: var(--white);
}

.ln-form-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    margin-bottom: 4px;
}

.ln-form small {
    color: var(--text-3);
    font-size: .75rem;
    font-weight: 700;
    letter-spacing: .3px;
    text-transform: uppercase;
}

.ln-form-word {
    color: var(--text);
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -.5px;
}

.ln-form-meaning {
    margin-bottom: 10px;
    color: var(--text-2);
    font-size: .88rem;
}

.ln-examples {
    display: flex;
    flex-direction: column;
    gap: 8px;
    list-style: none;
}

.ln-examples li {
    padding-top: 8px;
    border-top: 1px dashed var(--border);
    font-size: .9rem;
    line-height: 1.55;
}

.ln-examples span {
    display: block;
    color: var(--text-2);
    font-size: .84rem;
}

.ln-big-forms {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    margin-top: 20px;
}

.ln-big-forms div {
    padding: 12px 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: var(--white);
}

.ln-big-forms small {
    display: block;
    color: var(--text-3);
    font-size: .72rem;
    font-weight: 700;
}

.ln-big-forms b {
    color: var(--text);
    font-size: 1.35rem;
    font-weight: 800;
}

.ln-big-forms .lucide {
    color: var(--text-3);
}

.ln-tip {
    display: flex;
    gap: 14px;
    padding: 18px;
    border-radius: 18px;
    background: var(--yellow-pale);
}

.ln-tip b {
    display: block;
    margin-bottom: 4px;
    color: var(--text);
}

.ln-tip p {
    color: var(--text-2);
    font-size: .92rem;
    line-height: 1.6;
}

.ln-tip + .ln-tip {
    margin-top: 10px;
}

.ln-chip-links {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.ln-chip-links a {
    padding: 8px 14px;
    border: 1.5px solid var(--border);
    border-radius: 12px;
    background: var(--white);
    color: var(--text);
    font-size: .88rem;
    font-weight: 600;
    transition: border-color .15s ease;
}

.ln-chip-links a:hover {
    border-color: var(--green);
}

.ln-chip-links a small {
    margin-left: 4px;
    color: var(--text-3);
}

/* ── Đố nhanh (động từ, IPA) ── */
.ln-quiz {
    padding: 24px;
    border: 1.5px solid var(--border);
    border-radius: 22px;
    background: linear-gradient(160deg, var(--blue-pale), var(--white) 60%);
}

.ln-quiz-q {
    margin-bottom: 14px;
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.6;
}

.ln-quiz-q b {
    color: var(--green-ink);
    font-size: 1.3rem;
}

.ln-quiz-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.ln-quiz-row input {
    flex: 1 1 200px;
    height: 48px;
    padding: 0 14px;
    border: 2px solid var(--border);
    border-radius: 14px;
    color: var(--text);
    font: inherit;
    font-weight: 700;
    outline: none;
}

.ln-quiz-row input:focus {
    border-color: var(--blue);
}

.ln-quiz-score {
    color: var(--text-2);
    font-size: .85rem;
    font-weight: 700;
}

/* ── IPA ── */
.ln-ipa-group {
    margin-bottom: 36px;
}

.ln-ipa-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 10px;
}

.ln-ipa-cell {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 16px 8px 14px;
    border: 1.5px solid var(--border);
    border-bottom-width: 4px;
    border-radius: 16px;
    background: var(--white);
    text-align: center;
    transition: border-color .15s ease, transform .15s ease;
}

.ln-ipa-cell:hover {
    border-color: var(--green);
    transform: translateY(-2px);
}

.ln-ipa-cell b {
    color: var(--text);
    font-family: "Segoe UI", "Arial Unicode MS", system-ui, sans-serif;
    font-size: 1.7rem;
    font-weight: 700;
}

.ln-ipa-cell small {
    color: var(--text-2);
    font-size: .8rem;
}

/* link phủ cả ô, nút loa nằm trên link */
.ln-ipa-cell a::after {
    position: absolute;
    inset: 0;
    content: "";
}

.ln-ipa-cell .ln-speak {
    z-index: 1;
    position: absolute;
    top: 6px;
    right: 6px;
    width: 26px;
    height: 26px;
}

.ln-ipa-hero {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 28px;
    align-items: center;
}

.ln-ipa-symbol {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 24px;
    border: 1.5px solid var(--border);
    border-bottom-width: 5px;
    border-radius: 24px;
    background: var(--white);
}

.ln-ipa-symbol b {
    color: var(--text);
    font-family: "Segoe UI", "Arial Unicode MS", system-ui, sans-serif;
    font-size: 4rem;
    font-weight: 700;
    line-height: 1;
}

.ln-video {
    width: 100%;
    max-width: 420px;
    border-radius: 18px;
    background: #000;
}

.ln-words {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.ln-word {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    border: 1.5px solid var(--border);
    border-radius: 14px;
    background: var(--white);
}

.ln-word div {
    min-width: 0;
}

.ln-word b {
    display: block;
    color: var(--text);
}

.ln-word small {
    display: block;
    color: var(--text-2);
    font-size: .8rem;
}

.ln-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.ln-ipa-quiz .ln-options button {
    justify-content: center;
    font-size: 1.05rem;
}

/* ── Danh mục tài liệu (footer, hub chung) ── */
.ln-hubs {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.ln-hub {
    display: flex;
    gap: 14px;
    padding: 18px;
    border: 1.5px solid var(--border);
    border-radius: 18px;
    background: var(--white);
    transition: border-color .15s ease, transform .15s ease;
}

.ln-hub:hover {
    border-color: var(--green-mid);
    transform: translateY(-2px);
}

.ln-hub b {
    display: block;
    color: var(--text);
}

.ln-hub small {
    color: var(--text-2);
    font-size: .84rem;
    line-height: 1.5;
}

/* ── Chiến thuật IELTS ── */
.ln-stack > section + section {
    margin-top: 48px;
}

.ln-level-badge.is-blue { background: var(--blue); }
.ln-level-badge.is-purple { background: #9333ea; }

.ln-card-tall {
    gap: 4px;
}

.ln-card-sub {
    color: var(--green-ink);
    font-size: .86rem;
    font-weight: 700;
}

.ln-card-text {
    color: var(--text-2);
    font-size: .84rem;
    line-height: 1.55;
}

.ln-text {
    color: var(--text);
    line-height: 1.75;
}

.ln-muted {
    color: var(--text-3);
}

.ln-exam-box {
    margin-bottom: 16px;
    padding: 16px 18px;
    border-left: 4px solid var(--blue);
    border-radius: 0 14px 14px 0;
    background: var(--blue-pale);
}

.ln-exam-box small {
    display: block;
    margin-bottom: 4px;
    color: #0369a1;
    font-size: .74rem;
    font-weight: 700;
    letter-spacing: .4px;
    text-transform: uppercase;
}

.ln-exam-box p {
    color: var(--text);
    font-weight: 600;
    line-height: 1.6;
}

.ln-points {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.ln-point {
    padding: 18px;
    border: 1.5px solid var(--border);
    border-top-width: 4px;
    border-radius: 16px;
    background: var(--white);
}

.ln-point.is-good { border-top-color: var(--green); }
.ln-point.is-bad { border-top-color: var(--red); }
.ln-point.is-neutral { border-top-color: var(--blue); }

.ln-point > b {
    display: block;
    margin-bottom: 6px;
    color: var(--text);
}

.ln-point > p {
    color: var(--text-2);
    font-size: .92rem;
    line-height: 1.65;
}

.ln-point-example {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: 12px;
    background: var(--surface);
    font-size: .88rem;
    line-height: 1.55;
}

.ln-point-example small {
    display: inline-block;
    min-width: 62px;
    margin-right: 6px;
    color: var(--text-3);
    font-size: .74rem;
    font-weight: 700;
    text-transform: uppercase;
}

.ln-point-example em {
    color: var(--text-2);
}

.ln-flow {
    margin-top: 14px;
    padding: 18px;
    border-radius: 16px;
    background: var(--green-pale);
}

.ln-flow b {
    display: block;
    margin-bottom: 8px;
}

.ln-flow ol {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding-left: 20px;
    line-height: 1.6;
}

.ln-steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
    list-style: none;
}

.ln-steps li {
    display: flex;
    gap: 16px;
    padding: 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: var(--white);
}

.ln-step-no {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--green);
    color: var(--white);
    font-weight: 800;
}

.ln-steps b {
    display: block;
    margin-bottom: 4px;
    color: var(--text);
}

.ln-steps p {
    color: var(--text-2);
    font-size: .94rem;
    line-height: 1.65;
}

.ln-step-example {
    margin-top: 10px;
    padding: 10px 14px;
    border-radius: 10px;
    background: var(--yellow-pale);
    color: var(--text);
    font-size: .88rem;
    line-height: 1.55;
}

.ln-dialogue,
.ln-passage {
    margin-bottom: 16px;
    padding: 20px;
    border: 1.5px solid var(--border);
    border-radius: 18px;
    background: var(--surface);
}

.ln-dialogue-head {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
}

.ln-dialogue-head b {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.ln-line {
    display: flex;
    gap: 12px;
    padding: 10px 0;
    border-top: 1px dashed var(--border);
}

.ln-line p {
    color: var(--text);
    line-height: 1.55;
}

.ln-line small {
    color: var(--text-2);
    font-size: .86rem;
}

.ln-passage > small {
    color: var(--text-3);
    font-size: .74rem;
    font-weight: 700;
    text-transform: uppercase;
}

.ln-passage > p {
    margin-top: 6px;
    color: var(--text);
    line-height: 1.8;
}

.ln-passage details {
    margin-top: 10px;
    color: var(--text-2);
    font-size: .92rem;
}

.ln-passage summary {
    color: var(--green-ink);
    font-weight: 700;
    cursor: pointer;
}

.ln-worked {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ln-worked-item {
    padding: 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: var(--white);
}

.ln-worked-q span {
    color: var(--text-3);
    font-size: .76rem;
    font-weight: 700;
    text-transform: uppercase;
}

.ln-worked-q p {
    margin: 4px 0 12px;
    color: var(--text);
    font-weight: 600;
    line-height: 1.6;
}

.ln-worked-steps {
    display: flex;
    flex-direction: column;
    gap: 8px;
    list-style: none;
}

.ln-worked-steps li {
    display: grid;
    grid-template-columns: 110px 1fr;
    gap: 10px;
    font-size: .92rem;
    line-height: 1.55;
}

.ln-worked-steps small {
    align-self: start;
    padding: 3px 8px;
    border-radius: 8px;
    background: var(--blue-pale);
    color: #0369a1;
    font-size: .74rem;
    font-weight: 700;
    text-align: center;
}

.ln-worked-answer {
    margin-top: 12px;
    padding-top: 10px;
    border-top: 1px dashed var(--border);
    color: var(--text-2);
}

.ln-worked-answer b {
    color: var(--green-ink);
}

.ln-checklist {
    display: flex;
    flex-direction: column;
    gap: 10px;
    list-style: none;
}

.ln-checklist li {
    display: flex;
    gap: 10px;
    line-height: 1.6;
}

.ln-checklist .lucide {
    margin-top: 3px;
    color: var(--green);
}

.ln-table-plain {
    min-width: 520px;
}

.ln-table-plain td {
    vertical-align: top;
    line-height: 1.55;
}

/* ── Chép chính tả ── */
.ln-how {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
}

.ln-how > div {
    padding: 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
}

.ln-how b {
    display: block;
    margin: 10px 0 4px;
    color: var(--text);
}

.ln-how p {
    color: var(--text-2);
    font-size: .9rem;
    line-height: 1.6;
}

.ln-dict-play {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 14px;
}

.ln-dict-hint {
    margin-bottom: 12px;
    padding: 10px 14px;
    border-radius: 10px;
    background: var(--yellow-pale);
    color: var(--text);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: .92rem;
    letter-spacing: .5px;
    word-break: break-word;
}

.ln-dict-input {
    display: block;
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: 14px;
    color: var(--text);
    font: inherit;
    font-size: 1.02rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
}

.ln-dict-input:focus {
    border-color: var(--blue);
}

.ln-dict-result {
    margin-top: 8px;
    font-size: 1.02rem;
    line-height: 1.9;
}

.ln-dict-result .w-ok {
    padding: 1px 4px;
    border-radius: 6px;
    background: var(--green-pale);
    color: var(--green-ink);
    font-weight: 600;
}

.ln-dict-result .w-miss {
    padding: 1px 4px;
    border-radius: 6px;
    background: var(--white);
    color: #b91c1c;
    font-weight: 700;
    text-decoration: underline wavy #f87171;
}

.ln-tips-list {
    gap: 8px !important;
    padding-left: 18px;
    color: var(--text-2);
    font-size: .86rem;
    line-height: 1.55;
    list-style: decimal !important;
}

@media (max-width: 640px) {
    .ln-points,
    .ln-how {
        grid-template-columns: 1fr;
    }

    .ln-worked-steps li {
        grid-template-columns: 1fr;
        gap: 4px;
    }

    .ln-worked-steps small {
        justify-self: start;
    }
}

/* ── IELTS Writing ── */
.ln-subhead {
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 700;
}

.ln-link {
    color: var(--green-ink);
    font-weight: 700;
}

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

.ln-level-nav a.is-active {
    border-color: var(--green);
    background: var(--green-pale);
    color: var(--green-ink);
}

.ln-prompt-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.ln-prompt {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 16px 18px;
    border: 1.5px solid var(--border);
    border-radius: 16px;
    background: var(--white);
    transition: border-color .15s ease, transform .15s ease;
}

.ln-prompt:hover {
    border-color: var(--green-mid);
    transform: translateY(-2px);
}

.ln-prompt b {
    color: var(--text);
    font-size: .95rem;
    line-height: 1.5;
}

.ln-prompt small {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    color: var(--green-ink);
    font-size: .8rem;
    font-weight: 700;
}

.ln-guide .ln-checklist {
    margin-top: 16px;
}

.ln-guide .ln-checklist .lucide {
    color: #d97706;
}

.ln-outline {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 16px;
    list-style: none;
    counter-reset: outline;
}

.ln-outline li {
    position: relative;
    padding: 16px;
    border: 1.5px solid var(--border);
    border-radius: 14px;
    background: var(--white);
    counter-increment: outline;
}

.ln-outline li::before {
    display: block;
    margin-bottom: 6px;
    color: var(--green-ink);
    font-size: .75rem;
    font-weight: 800;
    content: "PHẦN " counter(outline);
}

.ln-outline b {
    display: block;
    margin-bottom: 4px;
    color: var(--text);
}

.ln-outline span {
    color: var(--text-2);
    font-size: .88rem;
    line-height: 1.55;
}

.ln-question {
    padding: 22px;
    border: 1.5px solid var(--border);
    border-left: 5px solid var(--purple);
    border-radius: 0 18px 18px 0;
    background: var(--white);
}

.ln-question p {
    color: var(--text);
    font-size: 1.05rem;
    font-weight: 600;
    line-height: 1.75;
}

.ln-question img {
    display: block;
    max-width: 100%;
    height: auto;
    margin-top: 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
}

.ln-question small {
    display: block;
    margin-top: 14px;
    color: var(--text-3);
    font-size: .84rem;
    font-style: italic;
}

.ln-essay {
    padding: 26px 28px;
    border: 1.5px solid var(--border);
    border-radius: 18px;
    background: #fffef9;
    color: var(--text);
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1.05rem;
    line-height: 1.85;
}

.ln-essay p + p {
    margin-top: 14px;
}

.ln-essay-teaser {
    position: relative;
    max-height: 420px;
    overflow: hidden;
    border-bottom-right-radius: 0;
    border-bottom-left-radius: 0;
}

.ln-essay-teaser::after {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 140px;
    background: linear-gradient(transparent, #fffef9);
    content: "";
}

.ln-unlock {
    padding: 22px 24px;
    border: 1.5px solid var(--border);
    border-top: 0;
    border-radius: 0 0 18px 18px;
    background: var(--green-pale);
    text-align: center;
}

.ln-unlock b {
    display: block;
    color: var(--text);
    font-size: 1.05rem;
}

.ln-unlock p {
    margin: 6px 0 14px;
    color: var(--text-2);
    font-size: .92rem;
}

@media (max-width: 1000px) {
    .ln-outline {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .ln-prompt-list,
    .ln-outline {
        grid-template-columns: 1fr;
    }

    .ln-essay {
        padding: 18px 16px;
        font-size: 1rem;
    }

    .ln-question {
        padding: 16px;
    }
}

/* ── Responsive ── */
@media (max-width: 1000px) {
    .ln-layout {
        grid-template-columns: minmax(0, 1fr);
    }

    .ln-aside {
        display: none;
    }

    .ln-cards,
    .ln-hubs {
        grid-template-columns: 1fr 1fr;
    }

    .ln-ipa-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .ln-forms,
    .ln-words {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .ln-hero {
        padding: 88px 0 28px;
    }

    .ln-lead {
        font-size: .96rem;
    }

    .ln-section {
        padding-block: 32px;
    }

    .ln-cards,
    .ln-hubs,
    .ln-forms,
    .ln-words,
    .ln-options,
    .ln-pair {
        grid-template-columns: 1fr;
    }

    .ln-ipa-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
    }

    .ln-ipa-hero {
        grid-template-columns: 1fr;
    }

    .ln-prose {
        font-size: .98rem;
    }

    .ln-prose h2 {
        font-size: 1.25rem;
    }

    .ln-try,
    .ln-quiz {
        padding: 20px 16px;
        border-radius: 18px;
    }

    .ln-cta {
        grid-template-columns: 1fr;
        padding: 24px 20px;
    }

    .ln-cta .ln-btn {
        width: 100%;
    }

    .ln-pager {
        grid-template-columns: 1fr;
    }

    .ln-pager .is-next {
        grid-column: auto;
    }
}