/* Trang học StaffSite. Wrapper .learn-page (tiền tố ln-) và .examtake-page (RCL) lấy màu thương hiệu từ _HomeLayout (--brand-*). */
.learn-page, .examtake-page, .ln-dialog {
    --primary: var(--brand-primary);
    --secondary: var(--brand-secondary);
    --accent: var(--brand-accent);
    --blue-dark: var(--brand-primary);
    --blue-light: color-mix(in srgb, var(--brand-primary) 85%, white);
    --pink: var(--brand-accent);
    --pink-light: color-mix(in srgb, var(--brand-accent) 22%, white);
    --pink-dark: color-mix(in srgb, var(--brand-accent) 80%, black);
    --yellow-light: #fff6dc;
    --yellow-dark: #b7791f;
    --bg-body: #fbfbfb;
    --white: #ffffff;
    --text-main: #1f2937;
    --text-muted: #5a6178;
    --gray-light: #eef0f5;
    --border: #e3e6ee;
    --success: #0f7b0f;
    --success-light: #dcf3dc;
    --danger: #c0392b;
    --danger-light: #fbe3e0;
    --warning: #b7791f;
    --warning-light: #fdf0d2;
    --info: #2f6fcb;
    --info-light: #dde9fa;
}
.learn-page [hidden], .examtake-page [hidden] { display: none !important; }

/* Thông báo nhỏ (learn-shim.js) */
.ln-toast-host { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 2000; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.ln-toast { pointer-events: auto; max-width: min(92vw, 420px); padding: 10px 16px; border-radius: 12px; font-weight: 700; font-size: 14px; color: #fff; background: #1f2937; box-shadow: 0 6px 20px rgba(0, 0, 0, .2); }
.ln-toast--success { background: #0f7b0f; }
.ln-toast--error { background: #c0392b; }

/* Hộp thoại xác nhận (learn-shim.js showModalConfirm) */
.ln-dialog { border: 0; border-radius: 16px; padding: 24px; max-width: min(92vw, 420px); color: var(--text-main); box-shadow: 0 12px 40px rgba(0, 0, 0, .25); }
.ln-dialog::backdrop { background: rgba(15, 23, 42, .5); }
.ln-dialog h3 { margin: 0 0 12px; font-size: 18px; }
.ln-dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 20px; }
.ln-dialog-actions button { min-height: 44px; padding: 0 18px; border-radius: 10px; font-weight: 700; cursor: pointer; border: 2px solid var(--brand-primary); background: #fff; color: var(--brand-primary); }
.ln-dialog-actions button.is-primary { background: var(--brand-primary); color: #fff; }

/* ===== Trang học (.learn-page, tiền tố ln-) ===== */
.learn-page.ln-wrap { width: 100%; max-width: 1080px; margin: 0 auto; box-sizing: border-box; padding: 16px; color: var(--text-main); font-family: inherit; display: flex; flex-direction: column; gap: 20px; }
.learn-page h1 { margin: 0; font-size: 26px; line-height: 1.25; color: var(--primary); }
.learn-page h2, .learn-page h3 { margin: 0; color: var(--primary); }
.learn-page .ln-sub { margin: 4px 0 0; color: var(--text-muted); font-size: 14px; }
.learn-page .ln-sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.learn-page .ln-head h1 { display: flex; align-items: center; gap: 10px; }
.learn-page .ln-back { display: inline-flex; align-items: center; gap: 6px; min-height: 44px; font-weight: 700; color: var(--primary); text-decoration: none; align-self: flex-start; }
.learn-page .ln-back:hover { text-decoration: underline; }
.learn-page .ln-notice { margin: 0; padding: 12px 16px; border-radius: 12px; background: var(--yellow-light); color: var(--text-main); font-weight: 600; display: flex; gap: 8px; align-items: center; }
.learn-page .ln-chip { display: inline-flex; align-items: center; gap: 6px; align-self: flex-start; padding: 3px 12px; border-radius: 99px; background: var(--pink-light); color: var(--primary); font-size: 12px; font-weight: 800; }

/* Nút */
.learn-page .ln-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 44px; padding: 0 20px; border-radius: 12px; border: 2px solid var(--primary); font: inherit; font-weight: 800; text-decoration: none; cursor: pointer; background: var(--white); color: var(--primary); box-sizing: border-box; }
.learn-page .ln-btn-primary { background: var(--primary); color: var(--white); }
.learn-page .ln-btn-primary:hover { background: color-mix(in srgb, var(--primary) 88%, black); }
.learn-page .ln-btn-outline:hover { background: var(--pink-light); }
.learn-page .ln-btn-lg { min-height: 52px; font-size: 16px; padding: 0 28px; }
.learn-page .ln-btn:focus-visible, .learn-page .ln-card:focus-visible, .learn-page a.ln-lesson:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.learn-page .ln-btn.is-disabled, .learn-page .ln-btn:disabled { opacity: .45; cursor: not-allowed; pointer-events: none; }

/* Trạng thái trống */
.learn-page .ln-empty { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px; padding: 32px 16px; background: var(--white); border: 2px dashed var(--border); border-radius: 20px; }
.learn-page .ln-empty-title { margin: 0; font-weight: 800; font-size: 18px; color: var(--primary); }

/* Thư viện */
.learn-page .ln-section-title { font-size: 20px; display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.learn-page .ln-count { font-size: 12px; font-weight: 800; padding: 2px 10px; border-radius: 99px; background: var(--gray-light); color: var(--text-muted); }
.learn-page .ln-grid { display: grid; grid-template-columns: 1fr; gap: 16px; }
.learn-page .ln-card { display: flex; flex-direction: column; background: var(--white); border: 2px solid var(--border); border-radius: 20px; overflow: hidden; text-decoration: none; color: inherit; transition: transform .15s, box-shadow .15s, border-color .15s; }
.learn-page .ln-card:hover { transform: translateY(-2px); border-color: var(--primary); box-shadow: 0 8px 20px color-mix(in srgb, var(--primary) 15%, transparent); }
.learn-page .ln-card-cover { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; display: block; background: var(--gray-light); }
.learn-page .ln-card-cover--empty { display: flex; align-items: center; justify-content: center; font-size: 40px; color: var(--primary); background: var(--pink-light); }
.learn-page .ln-card-body { display: flex; flex-direction: column; gap: 8px; padding: 14px 16px 16px; }
.learn-page .ln-card-title { font-weight: 800; font-size: 17px; color: var(--primary); line-height: 1.3; }
.learn-page .ln-card-meta, .learn-page .ln-card-foot { font-size: 13px; color: var(--text-muted); }
.learn-page .ln-progress { display: block; height: 8px; border-radius: 99px; background: var(--gray-light); overflow: hidden; }
.learn-page .ln-progress-bar { display: block; height: 100%; border-radius: 99px; background: var(--primary); }

/* Khoá học */
.learn-page .ln-course-head { display: flex; flex-direction: column; gap: 16px; background: var(--white); border: 2px solid var(--border); border-radius: 20px; overflow: hidden; }
.learn-page .ln-course-cover { width: 100%; aspect-ratio: 16 / 7; object-fit: cover; display: block; }
.learn-page .ln-course-info { padding: 0 20px 20px; display: flex; flex-direction: column; gap: 8px; }
.learn-page .ln-course-progress { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 8px; }
.learn-page .ln-ring { --ln-size: 72px; width: var(--ln-size); height: var(--ln-size); border-radius: 50%; display: inline-flex; align-items: center; justify-content: center; background: conic-gradient(var(--primary) calc(var(--ln-percent) * 1%), var(--gray-light) 0); position: relative; flex: 0 0 auto; }
.learn-page .ln-ring::before { content: ""; position: absolute; inset: 8px; border-radius: 50%; background: var(--white); }
.learn-page .ln-ring span { position: relative; font-weight: 800; font-size: 15px; color: var(--primary); }
.learn-page .ln-part { font-size: 18px; padding-top: 8px; border-top: 2px solid var(--border); }
.learn-page .ln-chapter { background: var(--white); border: 2px solid var(--border); border-radius: 16px; padding: 14px 8px 8px; }
.learn-page .ln-chapter-title { font-size: 17px; padding: 0 10px 8px; }
.learn-page .ln-lessons { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; }
.learn-page .ln-lesson { display: flex; align-items: center; gap: 10px; min-height: 56px; padding: 8px 10px; border-radius: 12px; text-decoration: none; color: inherit; }
.learn-page a.ln-lesson:hover { background: var(--pink-light); }
.learn-page .ln-lesson.is-locked { opacity: .55; cursor: not-allowed; }
.learn-page .ln-lesson-num { min-width: 36px; font-weight: 800; color: var(--text-muted); font-size: 13px; }
.learn-page .ln-lesson-icon { font-size: 24px; color: var(--primary); flex: 0 0 auto; }
.learn-page .ln-lesson-main { display: flex; flex-direction: column; flex: 1 1 auto; min-width: 0; }
.learn-page .ln-lesson-title { font-weight: 700; overflow-wrap: anywhere; }
.learn-page .ln-lesson-meta { font-size: 12px; color: var(--text-muted); }
.learn-page .ln-lesson-state { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; font-weight: 700; color: var(--text-muted); white-space: nowrap; }
.learn-page .ln-lesson.is-done .ln-lesson-state { color: var(--success); }
.learn-page .ln-lesson.is-doing .ln-lesson-state { color: var(--primary); }

/* Bài học */
.learn-page .ln-material-head { display: flex; flex-direction: column; gap: 6px; }
.learn-page .ln-stage { background: var(--white); border: 2px solid var(--border); border-radius: 20px; padding: 12px; }
.learn-page .ln-video { width: 100%; max-height: 70vh; border-radius: 12px; background: #000; display: block; }
.learn-page .ln-audio { width: 100%; display: block; }
.learn-page .ln-pdf { width: 100%; height: 70vh; border: 0; border-radius: 12px; background: var(--gray-light); }
.learn-page .ln-text { line-height: 1.7; font-size: 16px; overflow-wrap: anywhere; padding: 8px; }
.learn-page .ln-text img { max-width: 100%; height: auto; }
.learn-page .ln-block { padding: 12px 4px; border-bottom: 1px solid var(--border); }
.learn-page .ln-block:last-child { border-bottom: 0; }
.learn-page .ln-block-title { font-size: 18px; margin-bottom: 8px; }
.learn-page .ln-exam-card { display: flex; flex-wrap: wrap; align-items: center; gap: 16px; padding: 16px; }
.learn-page .ln-exam-icon { font-size: 44px; color: var(--primary); }
.learn-page .ln-exam-name { margin: 0; font-weight: 800; font-size: 18px; color: var(--primary); }
.learn-page .ln-exam-actions { display: flex; gap: 8px; flex-wrap: wrap; margin-left: auto; }
.learn-page .ln-player-root { min-height: 240px; }
.learn-page .ln-done-bar { display: flex; justify-content: center; }
.learn-page .ln-done-note { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; padding: 16px; border-radius: 16px; background: var(--success-light); border: 2px solid var(--success); }
.learn-page .ln-done-note[hidden] { display: none; }
.learn-page .ln-done-text { flex: 1 1 200px; }
.learn-page .ln-done-text p { margin: 2px 0 0; }
.learn-page .ln-bottom-nav { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; }

/* Hộp thoại câu hỏi trong bài (video tương tác, bài giảng tương tác) */
.learn-page .ln-quiz-message { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 8px; padding: 24px 12px; color: var(--text-main); }
.learn-page .ln-quiz-message i { font-size: 44px; color: var(--primary); }
.learn-page .ln-quiz-message p { margin: 0; color: var(--text-muted); }
.learn-page .ln-quiz-host { min-height: 160px; }

/* Khối trên Bảng điều khiển */
.learn-page .ln-dash-block { background: var(--white); border: 2px solid var(--border); border-radius: 20px; padding: 16px; }
.learn-page .ln-dash-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }

@media (min-width: 640px) {
    .learn-page .ln-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
    .learn-page.ln-wrap { padding: 24px; }
    .learn-page .ln-grid { grid-template-columns: repeat(3, 1fr); }
    .learn-page .ln-course-head { flex-direction: row; }
    .learn-page .ln-course-cover { width: 320px; aspect-ratio: auto; min-height: 200px; }
    .learn-page .ln-course-info { padding: 20px 20px 20px 4px; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
    .learn-page .ln-card { transition: none; }
}

/* ===== Lộ trình học theo ngày (E8) ===== */
.learn-page .ln-state { display: inline-flex; align-items: center; gap: 4px; padding: 3px 12px; border-radius: 99px; font-size: 12px; font-weight: 800; white-space: nowrap; background: var(--gray-light); color: var(--text-muted); }
.learn-page .ln-state--done { background: var(--success-light); color: var(--success); }
.learn-page .ln-state--open { background: var(--pink-light); color: var(--primary); }
.learn-page .ln-state--overdue { background: var(--danger-light); color: var(--danger); }
.learn-page .ln-state--exempt { background: var(--warning-light); color: var(--warning); }
.learn-page .ln-state--locked { background: var(--gray-light); color: var(--text-muted); }
.learn-page .ln-day { display: flex; flex-direction: column; gap: 10px; }
.learn-page .ln-day.is-today .ln-day-title { color: var(--primary); }
.learn-page .ln-day-title { font-size: 18px; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin: 0; }
.learn-page .ln-path-items { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.learn-page .ln-path-item { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; background: var(--white); border: 2px solid var(--border); border-radius: 16px; padding: 12px 14px; }
.learn-page .ln-day.is-today .ln-path-item { border-color: var(--primary); }
.learn-page .ln-path-item.is-locked { opacity: .65; }
.learn-page .ln-path-actions { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-left: auto; }
.learn-page .ln-path-head { display: flex; flex-direction: column; gap: 4px; }