/* ===========================================================
   Education / LMS — theme_hoidoanhnghiep
   =========================================================== */

.hdn-page-head--education {
    background: linear-gradient(135deg, var(--hdn-navy-dark) 0%, var(--hdn-navy) 55%, var(--hdn-navy-light) 100%);
    padding: 36px 0 40px;
}

.hdn-page-head--course { padding-bottom: 28px; }
.hdn-page-head--quiz h1 { margin-top: 12px; }

/* ——— Danh sách khóa học ——— */
.hdn-edu-list { padding-top: 40px; padding-bottom: 56px; }

.hdn-edu-categories {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
    padding: 16px 20px;
    background: var(--hdn-bg-alt);
    border-radius: var(--hdn-radius);
    border: 1px solid var(--hdn-border);
}

.hdn-edu-cat-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--hdn-navy);
    text-transform: uppercase;
    letter-spacing: .04em;
}

.hdn-edu-cat-pills { display: flex; flex-wrap: wrap; gap: 8px; }

.hdn-edu-cat-pill {
    font-size: 13px;
    padding: 6px 14px;
    border-radius: 999px;
    background: #fff;
    border: 1px solid var(--hdn-border);
    color: var(--hdn-muted);
}

.hdn-course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.hdn-course-card {
    background: #fff;
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius-lg);
    overflow: hidden;
    box-shadow: var(--hdn-shadow-sm);
    transition: transform .25s ease, box-shadow .25s ease;
    display: flex;
    flex-direction: column;
}

.hdn-course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--hdn-shadow);
}

.hdn-course-thumb {
    position: relative;
    display: block;
    aspect-ratio: 16 / 10;
    overflow: hidden;
    background: var(--hdn-bg-alt);
}

.hdn-course-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .35s ease;
}

.hdn-course-card:hover .hdn-course-thumb img { transform: scale(1.04); }

.hdn-course-thumb-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 42px;
    color: var(--hdn-gold);
    background: linear-gradient(145deg, var(--hdn-navy-dark), var(--hdn-navy-light));
}

.hdn-course-badge {
    position: absolute;
    top: 12px;
    left: 12px;
    font-size: 12px;
    font-weight: 700;
    padding: 5px 10px;
    border-radius: 999px;
    background: var(--hdn-navy);
    color: #fff;
}

.hdn-course-badge--free { background: var(--hdn-success); }

.hdn-course-body {
    padding: 18px 18px 20px;
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 10px;
}

.hdn-course-title {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.4;
    margin: 0;
}

.hdn-course-title a:hover { color: var(--hdn-gold); }

.hdn-course-desc {
    font-size: 14px;
    color: var(--hdn-muted);
    margin: 0;
    line-height: 1.55;
}

.hdn-course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 12px;
    color: var(--hdn-muted);
}

.hdn-course-meta i { color: var(--hdn-gold); margin-right: 4px; }

.hdn-course-cta { margin-top: auto; align-self: flex-start; }

.hdn-course-card--compact .hdn-course-desc { display: none; }

.hdn-edu-empty {
    text-align: center;
    padding: 56px 24px;
    background: var(--hdn-bg-alt);
    border-radius: var(--hdn-radius-lg);
    border: 1px dashed var(--hdn-border);
}

.hdn-edu-empty-icon {
    font-size: 48px;
    color: var(--hdn-gold);
    margin-bottom: 16px;
}

.hdn-edu-empty h2 { margin: 0 0 8px; font-size: 22px; }
.hdn-edu-empty p { color: var(--hdn-muted); margin: 0 0 20px; }

.hdn-edu-empty--inline { padding: 32px; }

/* ——— Chi tiết khóa học ——— */
.hdn-edu-detail { padding: 36px 0 56px; }

.hdn-edu-alert {
    padding: 14px 18px;
    border-radius: var(--hdn-radius);
    margin-bottom: 24px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.hdn-edu-alert--warn {
    background: #fff8e6;
    border: 1px solid #f0d78c;
    color: #8a6d1a;
}

.hdn-edu-detail-hero {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 32px;
    margin-bottom: 36px;
    align-items: start;
}

.hdn-edu-detail-media { border-radius: var(--hdn-radius-lg); overflow: hidden; }

.hdn-edu-detail-cover {
    width: 100%;
    border-radius: var(--hdn-radius-lg);
    aspect-ratio: 16 / 10;
    object-fit: cover;
}

.hdn-edu-detail-cover--placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    color: var(--hdn-gold);
    background: linear-gradient(145deg, var(--hdn-navy-dark), var(--hdn-navy));
}

.hdn-edu-video-wrap {
    position: relative;
    padding-top: 56.25%;
    background: #000;
    border-radius: var(--hdn-radius-lg);
    overflow: hidden;
}

.hdn-edu-video-wrap iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: 0;
}

.hdn-edu-detail-info h1 {
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 800;
    margin: 0 0 12px;
    line-height: 1.25;
}

.hdn-edu-detail-lead {
    color: var(--hdn-muted);
    font-size: 15px;
    margin: 0 0 16px;
}

.hdn-edu-detail-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    font-size: 13px;
    color: var(--hdn-muted);
    margin-bottom: 18px;
}

.hdn-edu-detail-stats i { color: var(--hdn-gold); margin-right: 4px; }

.hdn-edu-detail-price {
    display: flex;
    align-items: baseline;
    gap: 10px;
    margin-bottom: 20px;
}

.hdn-edu-detail-price strong {
    font-size: 28px;
    font-weight: 800;
    color: var(--hdn-navy);
}

.hdn-edu-price-free { color: var(--hdn-success) !important; }

.hdn-edu-detail-price del {
    font-size: 16px;
    color: var(--hdn-muted);
}

.hdn-edu-detail-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 12px; }

.hdn-btn-disabled {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 22px;
    border-radius: var(--hdn-radius-sm);
    background: var(--hdn-border);
    color: var(--hdn-muted);
    font-weight: 600;
    cursor: not-allowed;
}

.hdn-edu-promo {
    font-size: 13px;
    color: var(--hdn-gold);
    margin: 8px 0 0;
}

.hdn-edu-detail-body {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 28px;
    align-items: start;
}

.hdn-edu-panel {
    background: #fff;
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.hdn-edu-panel h2 {
    font-size: 18px;
    margin: 0 0 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hdn-edu-panel h2 i { color: var(--hdn-gold); }

.hdn-edu-panel--compact { margin-top: 20px; }

.hdn-edu-rich { font-size: 15px; line-height: 1.7; color: var(--hdn-ink); }
.hdn-edu-rich img { border-radius: var(--hdn-radius-sm); margin: 8px 0; }

.hdn-edu-curriculum {
    background: var(--hdn-bg-alt);
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius-lg);
    padding: 20px;
    position: sticky;
    top: calc(var(--hdn-header-h) + 16px);
}

.hdn-edu-curriculum h2 {
    font-size: 17px;
    margin: 0 0 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.hdn-edu-chapter {
    background: #fff;
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius);
    margin-bottom: 10px;
    overflow: hidden;
}

.hdn-edu-chapter summary {
    list-style: none;
    cursor: pointer;
    padding: 12px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 14px;
}

.hdn-edu-chapter summary::-webkit-details-marker { display: none; }

.hdn-edu-chapter-count {
    font-size: 12px;
    color: var(--hdn-muted);
    font-weight: 500;
}

.hdn-edu-lessons { padding: 0 14px 12px; }

.hdn-edu-lessons li {
    padding: 8px 0;
    border-top: 1px solid var(--hdn-border);
    font-size: 13px;
}

.hdn-edu-lessons a {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--hdn-ink);
}

.hdn-edu-lessons a:hover { color: var(--hdn-gold); }

.hdn-edu-lesson-locked {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--hdn-muted);
}

.hdn-edu-muted { color: var(--hdn-muted); font-size: 14px; }

.hdn-edu-related { margin-top: 48px; padding-top: 36px; border-top: 1px solid var(--hdn-border); }

/* ——— Trang học video ——— */
.hdn-edu-player-page { background: var(--hdn-bg-alt); min-height: 70vh; padding-bottom: 48px; }

.hdn-edu-player-top {
    background: var(--hdn-navy);
    color: #fff;
    padding: 14px 0;
}

.hdn-edu-player-top-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.hdn-edu-player-progress {
    font-size: 13px;
    font-weight: 600;
    color: var(--hdn-gold);
}

.hdn-edu-player-layout {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    margin-top: 24px;
    align-items: start;
}

.hdn-edu-player-main {
    background: #fff;
    border-radius: var(--hdn-radius-lg);
    border: 1px solid var(--hdn-border);
    padding: 20px;
    box-shadow: var(--hdn-shadow-sm);
}

.hdn-edu-lesson-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}

.hdn-edu-lesson-head h1 {
    font-size: 22px;
    margin: 0;
    font-weight: 800;
}

.hdn-edu-lesson-duration {
    font-size: 13px;
    color: var(--hdn-muted);
    white-space: nowrap;
}

.hdn-edu-player-box { margin-bottom: 8px; }

.hdn-edu-video-wrap--lesson { border-radius: var(--hdn-radius); }

.hdn-edu-native-video {
    width: 100%;
    max-height: 520px;
    border-radius: var(--hdn-radius);
    background: #000;
}

.hdn-edu-text-lesson {
    padding: 20px;
    background: var(--hdn-bg-alt);
    border-radius: var(--hdn-radius);
    max-height: 520px;
    overflow-y: auto;
}

.hdn-edu-lesson-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--hdn-border);
    flex-wrap: wrap;
}

.hdn-edu-sidebar {
    background: #fff;
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius-lg);
    overflow: hidden;
    position: sticky;
    top: calc(var(--hdn-header-h) + 16px);
    max-height: calc(100vh - var(--hdn-header-h) - 32px);
    display: flex;
    flex-direction: column;
}

.hdn-edu-sidebar-head {
    padding: 16px;
    background: var(--hdn-navy);
    color: #fff;
}

.hdn-edu-sidebar-head h2 {
    font-size: 15px;
    margin: 0 0 6px;
    line-height: 1.35;
}

.hdn-edu-sidebar-back {
    font-size: 12px;
    color: var(--hdn-gold);
}

.hdn-edu-sidebar-scroll {
    overflow-y: auto;
    flex: 1;
    padding: 8px 0 12px;
}

.hdn-edu-sidebar-chapter-title {
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: var(--hdn-muted);
    padding: 10px 16px 6px;
}

.hdn-edu-sidebar-chapter ul li a {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 16px;
    font-size: 13px;
    line-height: 1.4;
    border-left: 3px solid transparent;
}

.hdn-edu-sidebar-chapter ul li.is-active a,
.hdn-edu-sidebar-chapter ul li a:hover {
    background: var(--hdn-bg-alt);
    border-left-color: var(--hdn-gold);
}

.hdn-edu-sidebar-lesson-idx {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--hdn-border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    font-weight: 700;
}

.hdn-edu-sidebar-chapter ul li.is-active .hdn-edu-sidebar-lesson-idx {
    background: var(--hdn-gold);
    color: var(--hdn-navy-dark);
}

/* ——— Bài thi ——— */
.hdn-edu-quiz { padding: 36px 0 56px; }

.hdn-edu-quiz-wrap { max-width: 820px; }

.hdn-edu-quiz-intro {
    background: var(--hdn-bg-alt);
    border-radius: var(--hdn-radius);
    padding: 16px 20px;
    margin-bottom: 24px;
    font-size: 14px;
}

.hdn-edu-quiz-timer {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    padding: 8px 14px;
    background: #fff8e6;
    border: 1px solid #f0d78c;
    border-radius: var(--hdn-radius-sm);
    margin-bottom: 20px;
}

.hdn-edu-questions {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.hdn-edu-question {
    background: #fff;
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius-lg);
    padding: 20px;
}

.hdn-edu-question-head {
    display: flex;
    gap: 12px;
    align-items: flex-start;
    margin-bottom: 14px;
}

.hdn-edu-question-no {
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 800;
    color: #fff;
    background: var(--hdn-navy);
    padding: 4px 10px;
    border-radius: 999px;
}

.hdn-edu-question-text { font-weight: 600; font-size: 15px; line-height: 1.5; }

.hdn-edu-question-desc {
    font-size: 14px;
    color: var(--hdn-muted);
    margin-bottom: 12px;
    padding-left: 4px;
}

.hdn-edu-answers { display: flex; flex-direction: column; gap: 10px; }

.hdn-edu-answer {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 12px 14px;
    border: 1px solid var(--hdn-border);
    border-radius: var(--hdn-radius);
    cursor: pointer;
    transition: border-color .2s, background .2s;
}

.hdn-edu-answer:hover { border-color: var(--hdn-gold); background: #fffbef; }

.hdn-edu-answer input { margin-top: 4px; accent-color: var(--hdn-gold); }

.hdn-edu-answer input:checked + span { font-weight: 600; color: var(--hdn-navy); }

.hdn-edu-quiz-submit {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--hdn-border);
}

.hdn-edu-quiz-message {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: var(--hdn-radius);
    font-size: 14px;
}

.hdn-edu-quiz-message.is-error {
    background: #fdecec;
    color: var(--hdn-danger);
    border: 1px solid #f5c2c2;
}

.hdn-edu-quiz-result {
    text-align: center;
    padding: 48px 32px;
    background: #fff;
    border-radius: var(--hdn-radius-lg);
    border: 1px solid var(--hdn-border);
    box-shadow: var(--hdn-shadow-sm);
}

.hdn-edu-quiz-result-icon { font-size: 56px; margin-bottom: 16px; }
.hdn-edu-quiz-result--pass .hdn-edu-quiz-result-icon { color: var(--hdn-success); }
.hdn-edu-quiz-result--fail .hdn-edu-quiz-result-icon { color: var(--hdn-danger); }

.hdn-edu-quiz-result h2 { margin: 0 0 10px; font-size: 24px; }
.hdn-edu-quiz-result p { color: var(--hdn-muted); margin: 0 0 16px; }

.hdn-edu-quiz-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-top: 20px;
}

.hdn-btn-lg { padding: 14px 28px; font-size: 15px; }

/* ——— Responsive ——— */
@media (max-width: 1024px) {
    .hdn-course-grid { grid-template-columns: repeat(2, 1fr); }
    .hdn-course-grid--4 { grid-template-columns: repeat(2, 1fr); }
    .hdn-edu-detail-hero { grid-template-columns: 1fr; }
    .hdn-edu-detail-body { grid-template-columns: 1fr; }
    .hdn-edu-curriculum { position: static; }
    .hdn-edu-player-layout { grid-template-columns: 1fr; }
    .hdn-edu-sidebar { position: static; max-height: none; }
}

@media (max-width: 640px) {
    .hdn-course-grid,
    .hdn-course-grid--4 { grid-template-columns: 1fr; }
    .hdn-edu-lesson-nav { flex-direction: column; align-items: stretch; }
    .hdn-edu-lesson-nav .hdn-btn { width: 100%; justify-content: center; }
}