/* =======================================================
   HỆ THỐNG BIẾN MÀU (CSS VARIABLES)
   ======================================================= */
:root {
    /* Light Mode */
    --primary: #2563eb;
    --primary-rgb: 37, 99, 235;
    --lp-cyan: #06d6a0;
    --lp-blue: #118ab2;
    --bg-body: #e8f0fb;
    --bg-card: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    /* Theme helper variables used by some components */
    --theme-body-bg: var(--bg-card);
    --theme-card-bg: var(--bg-card);
    --theme-text-main: var(--text-main);
    --sidebar-text: #94a3b8;
    --navbar-bg: #ffffff;
    --border-color: #c5d5ee;
    --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    /* Dark Mode */
    --bg-body: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    /* Theme helper variables used by some components */
    --theme-body-bg: var(--bg-body);
    --theme-card-bg: var(--bg-card);
    --theme-text-main: var(--text-main);
    --sidebar-text: #64748b;
    --navbar-bg: #0a1628;
    --border-color: #334155;
    --card-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.4);
}

/* =======================================================
   CẤU TRÚC CƠ BẢN
   ======================================================= */
body {
    font-family: 'Source Sans 3', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    margin: 0;
    transition: var(--transition);
}

.main-wrapper {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* =======================================================
   SIDEBAR STYLE
   ======================================================= */
.sidebar {
    width: 260px;
    height: 100vh;
    background: linear-gradient(180deg, #0d1b2e 0%, #0f2040 50%, #122444 100%);
    transition: var(--transition);
    overflow-x: hidden;
    overflow-y: auto;
    white-space: nowrap;
    z-index: 1050;
    flex-shrink: 0;
    position: sticky;
    top: 0;
    border-right: 1px solid rgba(6,214,160,.12);
}

.sidebar.collapsed { width: 70px; }

/* Dark mode sidebar */
[data-theme="dark"] .sidebar {
    background: linear-gradient(180deg, #020914 0%, #061020 50%, #0a1628 100%);
    border-right-color: rgba(6,214,160,.15);
}

/* Light mode sidebar */
[data-theme="light"] .sidebar {
    background: linear-gradient(180deg, #f0f7ff 0%, #f8fafc 55%, #edf3fb 100%);
    border-right: 1px solid rgba(6,214,160,.22);
    box-shadow: 2px 0 12px rgba(0,0,0,.06);
}

.sidebar-header {
    height: 56px;
    display: flex;
    align-items: center;
    padding: 0 15px;
    border-bottom: 1px solid rgba(6,214,160,.2);
    background: rgba(6,214,160,.04);
}

[data-theme="light"] .sidebar-header {
    background: rgba(6,214,160,.06);
    border-bottom-color: rgba(6,214,160,.2);
}

/* Toggle button icon màu theo mode */
[data-theme="light"] #toggleSidebarPC { color: #334155 !important; }

.brand-name {
    font-family: 'Be Vietnam Pro', sans-serif;
    font-weight: 800;
    background: linear-gradient(135deg, #06d6a0, #38bdf8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.brand-name, .nav-text { transition: opacity 0.2s; }

.sidebar.collapsed .brand-name,
.sidebar.collapsed .nav-text {
    opacity: 0;
    pointer-events: none;
    width: 0;
}

.sidebar.collapsed .brand-wrapper { justify-content: center; width: 100%; }
.sidebar.collapsed .brand-wrapper img { margin-right: 0 !important; }

.nav-link {
    color: #94a3b8;
    padding: 0.8rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 15px;
    text-decoration: none;
    transition: 0.2s;
    margin: 4px 10px;
    border-radius: 8px;
    font-family: 'Be Vietnam Pro', sans-serif;
    font-weight: 500;
}

/* Light mode: nav-link text tối hơn */
[data-theme="light"] .nav-link { color: #475569; }
[data-theme="light"] .nav-link i { color: #64748b; }

.nav-link i { font-size: 1.2rem; min-width: 25px; text-align: center; }

.nav-link:hover {
    background: rgba(6,214,160,.1);
    color: #06d6a0;
}
[data-theme="light"] .nav-link:hover {
    background: rgba(6,214,160,.12);
    color: #0f766e;
}
[data-theme="light"] .nav-link:hover i { color: #0f766e; }

.nav-link.active {
    background: linear-gradient(135deg, rgba(6,214,160,.18), rgba(17,138,178,.15));
    color: #06d6a0;
    box-shadow: inset 0 0 0 1px rgba(6,214,160,.2);
}
[data-theme="light"] .nav-link.active {
    background: linear-gradient(135deg, rgba(6,214,160,.15), rgba(17,138,178,.1));
    color: #0f766e;
    box-shadow: inset 0 0 0 1px rgba(6,214,160,.3);
}
[data-theme="light"] .nav-link.active i { color: #0f766e; }

.nav-link.active i { color: #06d6a0; }

.sidebar.collapsed .nav-link {
    padding: 0.8rem 0;
    justify-content: center;
    margin: 4px 0;
    gap: 0;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sidebar { position: fixed; top: 0; margin-left: -260px; height: 100vh; }
    .sidebar.show { margin-left: 0; }
    .main-wrapper { height: auto; overflow: visible; }
    .content-area { height: auto; overflow: visible; }
    .content-area > main { overflow-y: visible; }
}

/* =======================================================
   CONTENT & COMPONENTS
   ======================================================= */
.content-area { flex-grow: 1; display: flex; flex-direction: column; min-width: 0; height: 100vh; overflow: hidden; }
.content-area > main { flex: 1; overflow-y: auto; min-height: 0; display: flex; flex-direction: column; }
.content-area > main > .main-content-body { flex: 1; }

.navbar {
    background-color: var(--navbar-bg);
    height: 56px;
    padding: 0 1.5rem;
    border-bottom: 1px solid rgba(6,214,160,.15);
    position: sticky;
    top: 0;
    z-index: 200;
    flex-shrink: 0;
    font-family: 'Be Vietnam Pro', sans-serif;
}

[data-theme="dark"] .navbar {
    background-color: #0a1628;
    border-bottom-color: rgba(6,214,160,.2);
}

/* ── Navbar auth buttons ── */
.nb-btn-primary {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 7px 18px; border-radius: 10px; border: none;
    background: linear-gradient(135deg, #06d6a0, #118ab2);
    color: #fff; font-family: 'Be Vietnam Pro', sans-serif;
    font-size: .82rem; font-weight: 700;
    text-decoration: none; cursor: pointer; white-space: nowrap;
    box-shadow: 0 4px 14px rgba(6,214,160,.3);
    transition: transform .18s, box-shadow .18s;
}
.nb-btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(6,214,160,.45);
    color: #fff;
}
.nb-btn-ghost {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 7px 18px; border-radius: 10px;
    background: rgba(255,255,255,.1); border: 1.5px solid rgba(255,255,255,.3);
    color: #e2e8f0; font-family: 'Be Vietnam Pro', sans-serif;
    font-size: .82rem; font-weight: 600;
    text-decoration: none; cursor: pointer; white-space: nowrap;
    transition: background .18s, border-color .18s, color .18s;
}
.nb-btn-ghost:hover { background: rgba(255,255,255,.18); color: #fff; }
[data-theme="light"] .nb-btn-ghost {
    background: rgba(15,23,42,.06); border-color: rgba(15,23,42,.25); color: #1e293b;
}
[data-theme="light"] .nb-btn-ghost:hover { background: rgba(15,23,42,.12); color: #0f172a; }

.lms-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
}

/* Theme helper classes (used by multiple templates) */
.bg-theme-body {
    background-color: var(--theme-body-bg) !important;
}
.bg-theme-card {
    background-color: var(--theme-card-bg) !important;
}
.text-main {
    color: var(--text-main) !important;
}

/* Dark mode hardening for Bootstrap defaults and inline white blocks */
[data-theme="dark"] {
    --bs-body-bg: var(--bg-body);
    --bs-body-color: var(--text-main);
}
[data-theme="dark"] body,
[data-theme="dark"] .content-area,
[data-theme="dark"] .main-wrapper,
[data-theme="dark"] .container-fluid,
[data-theme="dark"] .lms-card,
[data-theme="dark"] .student-notify-card,
[data-theme="dark"] .student-class-card,
[data-theme="dark"] .contest-card,
[data-theme="dark"] .classroom-card {
    background-color: var(--bg-body) !important;
    color: var(--text-main) !important;
}
[data-theme="dark"] .bg-white,
[data-theme="dark"] .bg-light,
[data-theme="dark"] .table-light,
[data-theme="dark"] .table thead th,
[data-theme="dark"] .breadcrumb,
[data-theme="dark"] .alert,
[data-theme="dark"] .modal-content,
[data-theme="dark"] .dropdown-menu {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}
[data-theme="dark"] .table tbody tr:hover,
[data-theme="dark"] .table-hover tbody tr:hover {
    background-color: rgba(229, 231, 235, 0.08) !important;
}
[data-theme="dark"] .breadcrumb-item a,
[data-theme="dark"] .breadcrumb-item,
[data-theme="dark"] .text-muted-custom,
[data-theme="dark"] .small,
[data-theme="dark"] .font-display,
[data-theme="dark"] .fw-bold {
    color: var(--text-main) !important;
}
[data-theme="dark"] .btn-outline-secondary,
[data-theme="dark"] .btn-light,
[data-theme="dark"] .btn-secondary {
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
    background-color: transparent !important;
}
[data-theme="dark"] .btn-outline-secondary:hover,
[data-theme="dark"] .btn-light:hover,
[data-theme="dark"] .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05) !important;
    color: var(--text-main) !important;
}

/* Dark mode fixes for nav-tabs / tab headers */
[data-theme="dark"] .nav-tabs {
    border-bottom-color: var(--border-color) !important;
}
[data-theme="dark"] .nav-tabs .nav-link {
    color: #cbd5e1 !important;
    background-color: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
    border-bottom-color: transparent !important;
}
[data-theme="dark"] .nav-tabs .nav-link:hover {
    color: #f8fafc !important;
    background-color: rgba(148, 163, 184, 0.25) !important;
}
[data-theme="dark"] .nav-tabs .nav-link.active,
[data-theme="dark"] .nav-tabs .nav-link.active:focus,
[data-theme="dark"] .nav-tabs .nav-link.active:hover {
    color: #fff !important;
    background-color: #0f172a !important;
    border-color: var(--border-color) !important;
    border-bottom-color: #0f172a !important;
}
[data-theme="dark"] .tab-content,
[data-theme="dark"] .learning-vnoj-tab-content {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
}

/* Light mode explicit reset so local templating dark-css rules cannot leak */
[data-theme="light"] body,
[data-theme="light"] .content-area,
[data-theme="light"] .main-wrapper,
[data-theme="light"] .container-fluid,
[data-theme="light"] .lms-card,
[data-theme="light"] .student-notify-card,
[data-theme="light"] .student-class-card,
[data-theme="light"] .contest-card,
[data-theme="light"] .classroom-card {
    background-color: var(--bg-body) !important;
    color: var(--text-main) !important;
}
[data-theme="light"] .bg-white,
[data-theme="light"] .bg-light,
[data-theme="light"] .table-light,
[data-theme="light"] .table thead th,
[data-theme="light"] .breadcrumb,
[data-theme="light"] .alert,
[data-theme="light"] .modal-content,
[data-theme="light"] .dropdown-menu {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}
[data-theme="light"] .table tbody tr:hover,
[data-theme="light"] .table-hover tbody tr:hover {
    background-color: rgba(0, 0, 0, 0.04) !important;
}
[data-theme="light"] .breadcrumb-item a,
[data-theme="light"] .breadcrumb-item,
[data-theme="light"] .text-muted-custom,
[data-theme="light"] .small,
[data-theme="light"] .font-display,
[data-theme="light"] .fw-bold {
    color: var(--text-main) !important;
}
[data-theme="light"] .btn-outline-secondary,
[data-theme="light"] .btn-light,
[data-theme="light"] .btn-secondary {
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}


/* Dropdown User */
.user-dropdown .dropdown-toggle {
    color: var(--text-main);
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: 50px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.user-dropdown .dropdown-menu {
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
    box-shadow: var(--shadow-lg);
    border-radius: 12px;
    padding: 0.5rem;
}

.user-dropdown .dropdown-item {
    color: var(--text-main) !important;
    padding: 0.7rem 1rem;
    border-radius: 8px;
    transition: 0.2s;
}

.user-dropdown .dropdown-item:hover {
    background-color: var(--primary) !important;
    color: #ffffff !important;
}

/* =======================================================
   CAPTCHA & AUTH FORMS
   ======================================================= */
.captcha-block {
    background: rgba(var(--primary-rgb), 0.03);
    padding: 15px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.captcha-action-row img.captcha {
    height: 40px;
    border-radius: 8px;
    background: white;
    padding: 4px;
    cursor: pointer;
}

.captcha-action-row input[name="captcha_1"] {
    max-width: 150px;
    height: 40px !important;
    text-transform: uppercase;
    text-align: center;
    letter-spacing: 3px;
    font-weight: bold;
}

/* Google Button & Auth Utilities */
.btn-google-custom {
    background-color: transparent;
    border: 1px solid var(--border-color) !important;
    color: var(--text-main) !important;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.btn-google-custom:hover {
    background-color: rgba(var(--primary-rgb), 0.05);
    border-color: var(--primary) !important;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
}

.google-icon-img {
    width: 20px !important;
    height: 20px !important;
    background: #ffffff;
    border-radius: 4px;
    padding: 2px;
    vertical-align: middle;
}

.hr-text { border-top: 1px solid var(--border-color); opacity: 0.3; }
.bg-card-custom { background-color: var(--bg-card) !important; color: var(--text-muted); }
.text-muted-custom { color: var(--text-muted) !important; }

/* =======================================================
   FOOTER & ANIMATIONS
   ======================================================= */
footer {
    padding: 0.5rem 0;
    text-align: center;
    font-family: 'Be Vietnam Pro', sans-serif;
    transition: background .3s, color .3s, border-color .3s;
}

[data-theme="dark"] footer {
    background: linear-gradient(135deg, #0d1b2e 0%, #0f2040 100%);
    color: #94a3b8;
    border-top: 1px solid rgba(6, 214, 160, .2);
}

[data-theme="light"] footer {
    background: var(--bg-card);
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -1px 0 rgba(0, 0, 0, .04);
}

footer .brand-text {
    font-weight: 700;
    color: var(--lp-cyan);
}

footer a {
    text-decoration: none;
    transition: color .2s;
}

[data-theme="dark"] footer a  { color: #cbd5e1; }
[data-theme="light"] footer a { color: var(--text-muted); }

footer a:hover { color: var(--lp-cyan) !important; }

footer .footer-icon {
    opacity: .7;
    transition: opacity .2s;
}
footer a:hover .footer-icon { opacity: 1; }

@keyframes bounceIn {
    from { opacity: 0; transform: scale(0.3); }
    to { opacity: 1; transform: scale(1); }
}
.animate__bounceIn { animation: bounceIn 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275); }

/* =======================================================
   FORM & INPUT (GHI ĐÈ CHO DARK MODE)
   ======================================================= */
.form-control, .form-select, .input-group-text {
    background-color: var(--bg-card) !important;
    border-color: var(--border-color) !important;
    color: var(--text-main) !important;
}
.form-control:focus, .form-select:focus {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 0.25rem rgba(var(--primary-rgb), 0.1) !important;
}
.form-label.text-main { color: var(--text-main) !important; }

/* Light mode: input nền trắng */
[data-theme="light"] .form-control,
[data-theme="light"] .form-select,
[data-theme="light"] .input-group-text {
    background-color: #ffffff !important;
    color: #1e293b !important;
    border-color: #c5d5ee !important;
}

/* Dark mode ép màu nền ô nhập liệu tối nhất */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select,
[data-theme="dark"] .input-group-text {
    background-color: var(--bg-body) !important;
    color: var(--text-main) !important;
}
[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: var(--bg-body) !important;
}

/* Raw input/select/textarea toàn trang theo theme */
input[type="text"],
input[type="password"],
input[type="email"],
input[type="number"],
input[type="search"],
input[type="date"],
input[type="tel"],
textarea,
select {
    background-color: var(--bg-card);
    color: var(--text-main);
    border-color: var(--border-color);
}
[data-theme="light"] input[type="text"],
[data-theme="light"] input[type="password"],
[data-theme="light"] input[type="email"],
[data-theme="light"] input[type="number"],
[data-theme="light"] input[type="search"],
[data-theme="light"] input[type="date"],
[data-theme="light"] input[type="tel"],
[data-theme="light"] textarea,
[data-theme="light"] select {
    background-color: #ffffff !important;
    color: #1e293b !important;
    border-color: #c5d5ee !important;
}
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] input[type="search"],
[data-theme="dark"] input[type="date"],
[data-theme="dark"] input[type="tel"],
[data-theme="dark"] textarea,
[data-theme="dark"] select {
    background-color: var(--bg-body) !important;
    color: var(--text-main) !important;
    border-color: var(--border-color) !important;
}

/* File Selector Button styling */
.form-control::file-selector-button {
    background-color: #f8fafc;
    color: var(--text-main);
    border: none;
    border-inline-end-width: 1px;
    border-inline-end-style: solid;
    border-inline-end-color: var(--border-color);
    padding: .375rem .75rem;
    margin: -.375rem -.75rem;
    margin-inline-end: .75rem;
    cursor: pointer;
    transition: var(--transition);
}
.form-control-sm::file-selector-button {
    padding: .25rem .5rem;
    margin: -.25rem -.5rem;
    margin-inline-end: .5rem;
}
.form-control:hover::file-selector-button {
    background-color: #f1f5f9;
}
[data-theme="dark"] .form-control::file-selector-button {
    background-color: #334155 !important;
    color: #f1f5f9 !important;
    border-right-color: var(--border-color) !important;
}
[data-theme="dark"] .form-control:hover::file-selector-button {
    background-color: #475569 !important;
}

/* Learning: code editor */
.learning-code-editor {
    min-height: 280px;
}

/* Learning: VNOJ testcase output */
.vnoj-case-output {
    background-color: rgba(var(--primary-rgb), 0.05) !important;
    color: var(--text-main) !important;
    border: 1px solid var(--border-color) !important;
    padding: 10px 12px !important;
    border-radius: 10px !important;
    white-space: pre-wrap;
    overflow: auto;
    font-size: 0.92rem;
}

.vnoj-case-item {
    background-color: rgba(var(--primary-rgb), 0.02);
}

/* =======================================================
   UPLOAD ZONE
   ======================================================= */
.upload-zone-wrapper {
    position: relative; /* QUAN TRỌNG: Ngăn chặn input file tràn màn hình */
    border: 2px dashed var(--border-color) !important;
    background-color: var(--bg-card);
    transition: all 0.3s;
    z-index: 1; /* Ép nó nằm im tại chỗ */
}
[data-theme="dark"] .upload-zone-wrapper {
    background-color: var(--bg-body) !important;
}
.upload-zone-wrapper:hover { border-color: var(--primary) !important; }

.upload-zone-wrapper input[type="file"] {
    position: absolute; 
    width: 100%; 
    height: 100%; 
    top: 0; 
    left: 0; 
    opacity: 0; 
    cursor: pointer; 
    z-index: 10;
}

/* =======================================================
   EASYMDE MARKDOWN EDITOR (TÙY CHỈNH & DARK MODE)
   ======================================================= */
.EasyMDEContainer .CodeMirror {
    border-color: var(--border-color) !important;
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
    border-radius: 0 0 8px 8px;
    font-family: var(--bs-font-monospace);
    min-height: 350px;
}
.EasyMDEContainer .editor-toolbar {
    border-color: var(--border-color) !important;
    background-color: var(--bg-body) !important;
    border-radius: 8px 8px 0 0;
    opacity: 0.9;
    border-bottom: none !important;
    /* Fix lỗi rớt dòng nút bấm */
    display: flex !important;
    flex-wrap: wrap !important;
    align-items: center !important;
    padding: 5px 8px !important;
}
.EasyMDEContainer .editor-toolbar::before,
.EasyMDEContainer .editor-toolbar::after {
    display: none !important;
}
/* Căn chỉnh và xóa phông nền mặc định của nút bấm */
.EasyMDEContainer .editor-toolbar button {
    background-color: transparent !important; /* XÓA NỀN TRẮNG MẶC ĐỊNH */
    border: 1px solid transparent !important; /* XÓA VIỀN MẶC ĐỊNH */
    color: var(--text-main) !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    width: 32px !important;
    height: 32px !important;
    margin: 0 2px !important;
    float: none !important;
    border-radius: 4px !important; /* Bo góc nút nhẹ nhàng */
    transition: all 0.2s ease;
}
.EasyMDEContainer .editor-toolbar i.separator {
    display: inline-block !important;
    float: none !important;
    margin: 0 6px !important;
    height: 20px !important;
    border-right: 1px solid var(--border-color) !important;
}
.EasyMDEContainer .editor-toolbar button:hover,
.EasyMDEContainer .editor-toolbar button.active {
    background-color: rgba(var(--primary-rgb), 0.1) !important; /* Hover chế độ sáng */
    border-color: transparent !important;
}

/* Fix lỗi Fullscreen bị che */
.editor-toolbar.fullscreen,
.CodeMirror-fullscreen,
.editor-preview-active-side {
    z-index: 9999 !important;
}

/* Dark Mode cho EasyMDE */
[data-theme="dark"] .EasyMDEContainer .CodeMirror {
    background-color: #000000 !important;
    color: #ffffff !important;
}
[data-theme="dark"] .EasyMDEContainer .editor-toolbar {
    background-color: #1a1a1a !important;
}

/* ÉP ICON CHUYỂN MÀU SÁNG TRONG DARK MODE */
[data-theme="dark"] .EasyMDEContainer .editor-toolbar button {
    color: #f1f5f9 !important; 
}

/* Nền khi rê chuột vào nút trong Dark Mode */
[data-theme="dark"] .EasyMDEContainer .editor-toolbar button:hover,
[data-theme="dark"] .EasyMDEContainer .editor-toolbar button.active {
    background-color: #334155 !important; 
}

.EasyMDEContainer .editor-preview-active {
    background-color: var(--bg-card) !important;
    color: var(--text-main) !important;
}

/* GỌI CON TRỎ CHUỘT (CARET) PHÁT SÁNG TRONG DARK MODE */
[data-theme="dark"] .EasyMDEContainer .CodeMirror-cursor {
    border-left-color: #ffffff !important; /* Đổi màu con trỏ thành trắng */
    border-left-width: 2px !important; /* Cho con trỏ dày lên một chút cho dễ nhìn */
}

/* =======================================================
   CÂY MỤC LỤC & QUẢN LÝ NỘI DUNG (CURRICULUM)
   ======================================================= */
.tree-container {
    font-size: 0.95rem;
}
.tree-node {
    position: relative;
    padding: 10px 12px;
    margin-bottom: 6px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
}

.toggle-icon {
    cursor: pointer;
    color: var(--primary);
    font-size: 1.1rem;
    width: 24px;
    display: inline-block;
    transition: transform 0.2s;
}
.toggle-icon.collapsed { transform: rotate(-90deg); }

/* Cấp 1: Mục lục (Root) */
.tree-root {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    font-weight: 600;
    color: var(--text-main);
}

/* Cấp 2: Chương học (Chapter) */
.tree-chapter {
    background-color: rgba(var(--primary-rgb), 0.05);
    color: var(--text-main);
    font-weight: 500;
    margin-left: 10px;
    border: 1px solid transparent;
}
[data-theme="dark"] .tree-chapter { background-color: rgba(255,255,255, 0.05); }

/* Cấp 3: Bài học (Lesson) */
.tree-lesson {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    margin-left: 30px;
    color: var(--text-main);
}
.tree-lesson:hover { border-color: var(--primary); }

/* Kì thi trong chương — thụt cùng cấp với bài học */
.contest-list {
    margin-left: 30px;
    padding-left: 12px;
    margin-top: 6px;
    margin-bottom: 4px;
    border-left: 3px solid rgba(255, 193, 7, 0.35);
}
.tree-contest {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    margin-left: 30px;
}
.tree-contest:hover {
    border-color: rgba(255, 193, 7, 0.65);
}
.tree-chapter:hover .tree-contest .action-pill {
    display: flex;
}

/* Trạng thái bài học đang được chọn (Active) */
.tree-lesson.active {
    background-color: var(--primary);
    color: #ffffff;
    border-color: var(--primary);
}

/* ================= THANH CÔNG CỤ NỔI (ACTION PILL) ================= */
.action-pill {
    display: none; /* Mặc định ẩn, chỉ hiện khi hover */
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    border-radius: 8px;
    padding: 4px 12px;
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    align-items: center;
    gap: 12px;
}
[data-theme="dark"] .action-pill { box-shadow: 0 4px 6px rgba(0,0,0,0.5); }

/* Đề trắc nghiệm trong chương — cùng cấp với bài học */
.tree-quiz-exam {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    margin-left: 30px;
}
.tree-quiz-exam:hover {
    border-color: rgba(13, 202, 240, 0.65);
}
.tree-quiz-exam.is-draft {
    opacity: 0.5;
    font-style: italic;
}

/* Chỉ hiện thanh công cụ khi rê chuột vào hàng tương ứng */
.tree-chapter:hover .action-pill,
.tree-lesson:hover .action-pill,
.tree-contest:hover .action-pill,
.tree-quiz-exam:hover .action-pill {
    display: flex;
}

.action-icon {
    color: var(--text-muted);
    cursor: pointer;
    transition: color 0.2s;
    font-size: 0.9rem;
}
.action-icon:hover { color: var(--primary); }
.action-icon.text-danger:hover { color: #dc3545 !important; }
.action-icon.text-warning:hover { color: #ffc107 !important; }

/* Dropdown Thêm bài học */
.action-pill .dropdown-toggle::after { display: none; }
.action-pill .dropdown-menu {
    font-size: 0.9rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    background-color: var(--bg-card);
}
.action-pill .dropdown-item {
    color: var(--text-main) !important;
}

/* Triệt tiêu padding dư thừa của vùng chứa nội dung chính */
.content-area {
    padding: 0 !important; /* Xóa sạch padding mặc định của vùng chứa */
}

/* Giảm khoảng cách dưới của Navbar nếu nó đang đẩy nội dung xuống */
.navbar {
    margin-bottom: 0 !important; 
}

/* Nếu thầy muốn các khối sát nhau hơn nữa, hãy giảm gutter (khoảng cách giữa các cột) */
.row.flex-grow-1 {
    --bs-gutter-x: 0.5rem; /* Giảm khoảng cách giữa Sidebar trái và vùng nội dung phải */
}

/* Hiệu ứng cho chương ở trạng thái Bản nháp */
.chapter-group.is-draft .tree-chapter span {
    opacity: 0.5; /* Làm mờ chữ */
    font-style: italic; /* Chữ nghiêng để dễ nhận diện */
}

.chapter-group.is-draft .tree-chapter::after {
    content: "(Bản nháp)";
    font-size: 0.7rem;
    margin-left: 10px;
    opacity: 0.6;
    text-transform: none;
    font-weight: normal;
}
/* Hiệu ứng cho bài học ở trạng thái Bản nháp */
.tree-lesson.is-draft {
    opacity: 0.5;
    font-style: italic;
}
.tree-lesson.is-draft::after {
    content: "(Bản nháp)";
    font-size: 0.7rem;
    margin-left: 10px;
    opacity: 0.6;
    font-weight: normal;
}

/* =======================================================
   LEARNING MODE (CHẾ ĐỘ HỌC TẬP TỐI GIẢN)
   ======================================================= */

/* 1. Biến cục bộ cho nội dung đọc */
:root {
    /* THAY ĐỔI TẠI ĐÂY: Chuyển từ 900px sang 100% hoặc giá trị lớn hơn */
    --reading-width: 100%; 
    --learning-header-h: 65px;
}



/* 2. Ép giao diện Fullscreen khi ở chế độ học */
body.learning-mode-active {
    background-color: var(--bg-body) !important;
    padding-top: 0 !important;
}

/* Ẩn Sidebar và Navbar chính của hệ thống quản lý */
body.learning-mode-active .sidebar,
body.learning-mode-active .navbar,
body.learning-mode-active footer:not(.learning-footer) {
    display: none !important;
}

/* Ẩn sidebar trên các trang full-width của contest */
body.contest-ranking-page .sidebar,
body.contest-submissions-page .sidebar {
    display: none !important;
}

/* 3. Header dành riêng cho bài học */
.learning-header {
    height: var(--learning-header-h);
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1100;
    display: flex;
    align-items: center;
    box-shadow: var(--card-shadow);
}

/* 4. Khung chứa nội dung bài học */
.learning-container {
    max-width: var(--reading-width);
    margin: 0 auto;
    padding: 30px 50px; /* Tăng padding hai bên để dễ đọc hơn trên màn hình rộng */
    min-height: calc(100vh - var(--learning-header-h));
}

/* Bài học mở trong iframe (view_courses / contest nhúng): bỏ ép cao 100vh, tránh tràn & lồng giao diện */
body.learning-mode-active.learning-embed-iframe .learning-container {
    min-height: 0;
    padding: 12px 16px 24px;
}
body.learning-mode-active.learning-embed-iframe .learning-page-wrapper {
    min-height: 0;
}
body.learning-embed-iframe .view-code-wrapper .learning-code-problem-body {
    max-height: none;
    overflow: visible;
}
body.learning-embed-iframe .learning-code-editor-wrap textarea.learning-code-editor {
    min-height: 220px;
}

/* 5. Định dạng văn bản bài viết (Markdown) */
.article-render {
    line-height: 1.8;
    font-size: 1.15rem;
    color: var(--text-main);
}
.article-render h1, .article-render h2 {
    margin-top: 2.5rem;
    margin-bottom: 1.2rem;
    font-weight: 700;
}
.article-render p { margin-bottom: 1.5rem; }
.article-render img {
    max-width: 100%;
    border-radius: 12px;
    margin: 2rem 0;
    border: 1px solid var(--border-color);
}

/* 6. Khung Iframe cho bài học Interactive */
.lab-sandbox-wrapper {
    background-color: #ffffff; /* Luôn giữ nền trắng cho nội dung mô phỏng nếu cần */
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

/* =======================================================
   RE-DESIGN: LEARNING FOOTER & MODERN SQUARE BUTTONS
   ======================================================= */

/* 1. Tinh gọn Footer: Giảm chiều cao đáng kể */
.learning-mode-active .learning-footer {
    border-top: 1px solid var(--border-color);
    margin-top: 50px; /* Giảm khoảng cách phía trên */
    padding: 15px 0;   /* Giảm padding dọc từ 40px xuống 15px -> Cực gọn */
    background-color: var(--bg-card); /* Thêm nền để footer tách biệt */
}

/* 2. Thiết kế nút Modern Square (Nút vuông phẳng hiện đại) */
/* Lớp dùng chung cho cả 2 nút */
.learn-nav-btn {
    border-radius: 4px !important; /* Góc bo cực nhỏ (hệ CSS 5) tạo cảm giác vuông vắn hiện đại */
    font-weight: 500;
    text-transform: uppercase;   /* Viết hoa phẳng (flat style) */
    letter-spacing: 0.5px;
    font-size: 0.85rem;          /* Chữ nhỏ gọn */
    padding: 10px 25px;          /* Padding chuẩn cho nút */
    transition: all 0.2s ease;
    border: 1px solid transparent;
    box-shadow: none !important;  /* Loại bỏ shadow loè loẹt */
}

/* Nút "Bài trước" - Dạng Outline xám tối giản */
.learn-nav-btn-prev {
    color: var(--text-muted);
    background-color: transparent;
    border-color: var(--border-color); /* Sử dụng màu border hệ thống */
}

.learn-nav-btn-prev:hover {
    background-color: var(--bg-body); /* Nền tối nhẹ khi hover */
    color: var(--text-main);
    border-color: var(--text-muted);
}

/* Nút "Bài kế tiếp" - Dạng Phẳng màu Primary */
.learn-nav-btn-next {
    background-color: var(--primary); /* Màu xanh chính của thầy */
    color: #ffffff !important;        /* Luôn giữ chữ trắng */
}

.learn-nav-btn-next:hover {
    filter: brightness(1.1); /* Sáng lên nhẹ khi hover */
}

.learn-nav-btn:disabled, 
.learn-nav-btn.disabled {
    cursor: not-allowed;
    filter: grayscale(1);
    pointer-events: none;
}

.interactive-lab-wrapper {
    width: 100%;
}

.lab-sandbox-container {
    background-color: #fff;
    /* Hiệu ứng viền mỏng hiện đại */
    border: 1px solid var(--border-color) !important;
}

/* Tối ưu hiển thị cho bài Lab trên thiết bị di động */
@media (max-width: 768px) {
    .lab-sandbox-container iframe {
        height: 450px;
    }
    .learning-container {
        padding: 15px; /* Giảm padding trên mobile */
    }
}

/* =========================================================
   FIX DARK MODE CHO COMPONENT TÌM KIẾM VNOJ
   ========================================================= */

/* 1. Đồng bộ Form Input & Select */
.lms-card .form-control, 
.lms-card .form-select {
    background-color: var(--theme-body-bg) !important;
    color: var(--theme-text-main) !important;
    border-color: var(--border-color) !important;
}

.lms-card .form-control::placeholder {
    color: #888888 !important; 
}

/* 2. Đồng bộ Header của Table */
.lms-card .table-light th {
    background-color: var(--theme-card-bg) !important;
    color: var(--theme-text-main) !important;
    border-bottom-color: var(--border-color) !important;
}

/* 3. Đồng bộ Text trong toàn bộ Table */
.lms-card .table {
    color: var(--theme-text-main) !important;
}

/* 4. Xử lý màu chữ khi dùng table-striped (Hàng chẵn lẻ) & Hover */
.lms-card .table-striped > tbody > tr:nth-of-type(odd) > *,
.lms-card .table-hover > tbody > tr:hover > * {
    color: var(--theme-text-main) !important;
}

    .vnoj-darkmode-fix .form-control, 
    .vnoj-darkmode-fix .form-select {
        background-color: var(--theme-body-bg, #ffffff) !important;
        color: var(--theme-text-main, #212529) !important;
        border-color: var(--border-color, #dee2e6) !important;
    }
    
    .vnoj-darkmode-fix .form-control::placeholder {
        color: #888888 !important; 
    }
    
    .vnoj-darkmode-fix .table-light th {
        background-color: var(--theme-card-bg, #f8f9fa) !important;
        color: var(--theme-text-main, #212529) !important;
        border-bottom-color: var(--border-color, #dee2e6) !important;
    }
    
    .vnoj-darkmode-fix .table,
    .vnoj-darkmode-fix .table-striped > tbody > tr:nth-of-type(odd) > *,
    .vnoj-darkmode-fix .table-hover > tbody > tr:hover > * {
        color: var(--theme-text-main, #212529) !important;
    }

/* =======================================================
   Learning: CODE VNOJ view_code.html (accent + results)
   ======================================================= */
.view-code-wrapper {
    padding-top: 0;
}

.view-code-wrapper .learning-code-top {
    align-items: stretch;
}

.view-code-wrapper .learning-code-top .learning-code-acc-card,
.view-code-wrapper .learning-code-result-row .learning-code-acc-card,
.view-code-wrapper .learning-code-guide .learning-code-acc-card {
    position: relative;
    overflow: hidden;
    border-color: rgba(var(--primary-rgb), 0.25) !important;
}

.view-code-wrapper .learning-code-top .learning-code-acc-card::before,
.view-code-wrapper .learning-code-result-row .learning-code-acc-card::before,
.view-code-wrapper .learning-code-guide .learning-code-acc-card::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: rgba(var(--primary-rgb), 0.65);
    border-top-left-radius: 12px;
    border-bottom-left-radius: 12px;
    pointer-events: none;
}

/* Giảm padding trên phần đề bài để sát mép trên hơn */
.view-code-wrapper .learning-code-problem-card {
    padding-top: 0.9rem !important;
    padding-bottom: 0.9rem !important;
}
.view-code-wrapper .learning-code-problem-card .article-render h1:first-child,
.view-code-wrapper .learning-code-problem-card .article-render h2:first-child {
    margin-top: 0 !important;
}
.view-code-wrapper .learning-code-problem-card .article-render p:first-child {
    margin-top: 0 !important;
}
.view-code-wrapper .learning-code-right-card {
    padding-top: 0.9rem !important;
    padding-bottom: 0.9rem !important;
}

#vnoj-problem-frame {
    border: 1px solid var(--border-color) !important;
    background: #ffffff;
}
[data-theme="dark"] #vnoj-problem-frame {
    background: #0b1220;
}

/* view_code: hai tab iframe (relay VNOJ đề + nộp bài) */
.view-code-wrapper .learning-vnoj-tab-content {
    overflow: visible;
    background: var(--bs-body-bg, #fff);
}
.view-code-wrapper .learning-vnoj-tab-pane {
    min-height: 0;
}
.view-code-wrapper .learning-vnoj-iframe,
.view-code-wrapper #vnoj-submit-frame {
    width: 100%;
    display: block;
    min-height: 70vh;
    height: calc(100vh - 240px);
    background: #ffffff;
    border: 1px solid var(--border-color) !important;
}
[data-theme="dark"] .view-code-wrapper .learning-vnoj-iframe,
[data-theme="dark"] .view-code-wrapper #vnoj-submit-frame {
    background: #0b1220;
}
.view-code-wrapper #learning-vnoj-tabs .nav-link {
    color: var(--theme-text-muted, #6c757d);
}
.view-code-wrapper #learning-vnoj-tabs .nav-link.active {
    color: var(--theme-text-main, #212529);
    font-weight: 600;
}

/* view_code: đề bài + editor gọn, tránh khoảng trống thừa */
.view-code-wrapper .learning-code-lesson-title {
    margin-top: 0;
}
.view-code-wrapper .learning-code-problem-body {
    max-height: none;
    overflow: visible;
}
.view-code-wrapper .learning-code-problem-body h1,
.view-code-wrapper .learning-code-problem-body h2,
.view-code-wrapper .learning-code-problem-body h3 {
    margin-top: 0.85rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
    color: var(--theme-text-main, inherit);
}
.view-code-wrapper .learning-code-problem-body h1:first-child,
.view-code-wrapper .learning-code-problem-body h2:first-child {
    margin-top: 0;
}
.view-code-wrapper .learning-code-problem-body p {
    margin-bottom: 0.5rem;
}
.view-code-wrapper .learning-code-problem-body ul,
.view-code-wrapper .learning-code-problem-body ol {
    margin-bottom: 0.5rem;
    padding-left: 1.25rem;
}
.view-code-wrapper .learning-code-problem-body pre {
    border-radius: 8px;
    padding: 0.75rem 1rem;
    margin: 0.5rem 0;
    border: 1px solid var(--border-color);
    overflow-x: auto;
}
.view-code-wrapper .learning-code-problem-body code {
    font-size: 0.9em;
}
.view-code-wrapper .learning-code-problem-body blockquote {
    border-left: 4px solid rgba(var(--primary-rgb), 0.45);
    padding-left: 0.75rem;
    margin: 0.5rem 0;
    color: var(--text-muted);
}
.view-code-wrapper .learning-code-right-card .learning-code-editor-wrap {
    min-height: 0;
}

.learning-code-editor-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
}
.learning-code-editor-wrap textarea.learning-code-editor {
    flex: 1;
    min-height: 360px;
}

/* Result title background theo trạng thái */
.vnoj-result-title {
    padding: 8px 12px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    background: rgba(var(--primary-rgb), 0.08);
}

.vnoj-overall-unknown {
    background: rgba(148, 163, 184, 0.12) !important;
    border-color: rgba(148, 163, 184, 0.25) !important;
    color: var(--text-muted) !important;
}
.vnoj-overall-ac {
    background: rgba(34, 197, 94, 0.18) !important;
    border-color: rgba(34, 197, 94, 0.35) !important;
    color: #34d399 !important;
}
.vnoj-overall-partial {
    background: rgba(245, 158, 11, 0.18) !important;
    border-color: rgba(245, 158, 11, 0.35) !important;
    color: #fbbf24 !important;
}
.vnoj-overall-wrong {
    background: rgba(239, 68, 68, 0.18) !important;
    border-color: rgba(239, 68, 68, 0.35) !important;
    color: #f87171 !important;
}
.vnoj-overall-ce {
    background: rgba(168, 85, 247, 0.18) !important;
    border-color: rgba(168, 85, 247, 0.35) !important;
    color: #c084fc !important;
}

/* Testcase màu theo trạng thái */
.vnoj-case-status-correct {
    background-color: rgba(34, 197, 94, 0.12) !important;
    border-color: rgba(34, 197, 94, 0.35) !important;
}
.vnoj-case-status-runtime {
    background-color: rgba(245, 158, 11, 0.14) !important;
    border-color: rgba(245, 158, 11, 0.35) !important;
}
.vnoj-case-status-wrong {
    background-color: rgba(239, 68, 68, 0.12) !important;
    border-color: rgba(239, 68, 68, 0.35) !important;
}
.vnoj-case-status-tle {
    background-color: rgba(148, 163, 184, 0.12) !important;
    border-color: rgba(148, 163, 184, 0.35) !important;
    color: var(--text-muted) !important;
}

/* Bảng testcase tab kết quả: Bootstrap .table tô nền lên td — ép màu theo hàng */
#result-cases-table tbody tr.vnoj-case-status-correct > td {
    background-color: rgba(34, 197, 94, 0.22) !important;
    border-color: rgba(34, 197, 94, 0.4) !important;
}
#result-cases-table tbody tr.vnoj-case-status-wrong > td {
    background-color: rgba(239, 68, 68, 0.2) !important;
    border-color: rgba(239, 68, 68, 0.45) !important;
}
#result-cases-table tbody tr.vnoj-case-status-runtime > td {
    background-color: rgba(245, 158, 11, 0.22) !important;
    border-color: rgba(245, 158, 11, 0.45) !important;
}
#result-cases-table tbody tr.vnoj-case-status-tle > td {
    background-color: rgba(100, 116, 139, 0.2) !important;
    border-color: rgba(100, 116, 139, 0.4) !important;
    color: var(--text-main, inherit) !important;
}
#result-cases-table tbody tr.vnoj-case-status-correct:hover > td,
#result-cases-table tbody tr.vnoj-case-status-wrong:hover > td,
#result-cases-table tbody tr.vnoj-case-status-runtime:hover > td,
#result-cases-table tbody tr.vnoj-case-status-tle:hover > td {
    filter: brightness(0.97);
}

/* Modal testcase phải nổi trên .learning-header (z-index 1100) */
body.learning-mode-active .modal-backdrop {
    z-index: 1180;
}
body.learning-mode-active .modal {
    z-index: 1190;
}

.vnoj-case-label.correct {
    background: rgba(34, 197, 94, 0.15);
    color: #34d399;
}
.vnoj-case-label.runtime {
    background: rgba(245, 158, 11, 0.15);
    color: #fbbf24;
}
.vnoj-case-label.wrong {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
}
.vnoj-case-label.tle {
    background: rgba(148, 163, 184, 0.15);
    color: var(--text-muted);
}

.vnoj-case-output {
    /* nền output giữ thống nhất trong dark mode */
    white-space: pre-wrap;
}

.vnoj-case-status-correct .vnoj-case-output {
    background-color: rgba(34, 197, 94, 0.10) !important;
    border-color: rgba(34, 197, 94, 0.35) !important;
}
.vnoj-case-status-runtime .vnoj-case-output {
    background-color: rgba(245, 158, 11, 0.10) !important;
    border-color: rgba(245, 158, 11, 0.35) !important;
}
.vnoj-case-status-wrong .vnoj-case-output {
    background-color: rgba(239, 68, 68, 0.10) !important;
    border-color: rgba(239, 68, 68, 0.35) !important;
}
.vnoj-case-status-tle .vnoj-case-output {
    background-color: rgba(148, 163, 184, 0.08) !important;
    border-color: rgba(148, 163, 184, 0.35) !important;
}

/* CodeMirror editor (learning view_code.html) */
.learning-code-codemirror {
    border: 1px solid var(--border-color) !important;
    border-radius: 10px;
    overflow: hidden;
    background: var(--bg-card, #fff);
    position: relative;
    z-index: 2;
    min-height: 300px;
}
.learning-code-codemirror .CodeMirror {
    height: min(52vh, 480px);
    min-height: 280px;
    font-family: var(--bs-font-monospace, ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace);
    font-size: 13.5px;
    cursor: text;
    pointer-events: auto;
}

/* Trang học: editor nằm trong tab — tránh bị che / không focus */
.view-code-wrapper .tab-pane .learning-code-codemirror .CodeMirror-scroll {
    min-height: 260px;
}

/* Theme eclipse (sáng): tôn màu từng ngôn ngữ + nền đọc được trên LMS */
.view-code-wrapper .cm-s-eclipse.CodeMirror {
    background-color: #ffffff !important;
    color: #1a1a1a !important;
}
.view-code-wrapper .cm-s-eclipse .CodeMirror-gutters {
    background-color: #f1f5f9 !important;
    border-right: 1px solid var(--border-color, #e2e8f0) !important;
    color: #64748b !important;
}
.view-code-wrapper .cm-s-eclipse .CodeMirror-linenumber {
    color: #94a3b8 !important;
}
.view-code-wrapper .cm-s-eclipse .CodeMirror-cursor {
    border-left: 2px solid #0f172a !important;
}
.view-code-wrapper .cm-s-eclipse .cm-keyword {
    color: #7c3aed !important;
}
.view-code-wrapper .cm-s-eclipse .cm-atom,
.view-code-wrapper .cm-s-eclipse .cm-number {
    color: #0369a1 !important;
}
.view-code-wrapper .cm-s-eclipse .cm-def {
    color: #c026d3 !important;
}
.view-code-wrapper .cm-s-eclipse .cm-variable,
.view-code-wrapper .cm-s-eclipse .cm-variable-2,
.view-code-wrapper .cm-s-eclipse .cm-variable-3 {
    color: #1e293b !important;
}
.view-code-wrapper .cm-s-eclipse .cm-property {
    color: #0d9488 !important;
}
.view-code-wrapper .cm-s-eclipse .cm-operator {
    color: #64748b !important;
}
.view-code-wrapper .cm-s-eclipse .cm-comment {
    color: #16a34a !important;
    font-style: italic;
}
.view-code-wrapper .cm-s-eclipse .cm-string,
.view-code-wrapper .cm-s-eclipse .cm-string-2 {
    color: #ca8a04 !important;
}
.view-code-wrapper .cm-s-eclipse .cm-meta,
.view-code-wrapper .cm-s-eclipse .cm-qualifier {
    color: #64748b !important;
}
.view-code-wrapper .cm-s-eclipse .cm-bracket {
    color: #334155 !important;
}
.view-code-wrapper .cm-s-eclipse .cm-tag {
    color: #2563eb !important;
}
.view-code-wrapper .cm-s-eclipse .cm-attribute {
    color: #7c3aed !important;
}
.view-code-wrapper .cm-s-eclipse .cm-error {
    color: #dc2626 !important;
}

/* CodeMirror for teacher editors (simulation tabs) */
.CodeMirror {
    border-color: var(--border-color) !important;
}
[data-theme="dark"] .CodeMirror {
    background-color: #0b1220 !important;
    color: var(--text-main) !important;
}
[data-theme="dark"] .CodeMirror-gutters {
    background-color: #0b1220 !important;
    border-right: 1px solid var(--border-color) !important;
}

/* Dark: material-darker — token C/C++/Python/Pascal rõ hơn */
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker.CodeMirror {
    background-color: #0b1220 !important;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-keyword {
    color: #c792ea !important;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-def,
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-variable-2 {
    color: #82aaff !important;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-string,
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-string-2 {
    color: #c3e88d !important;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-number,
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-atom {
    color: #f78c6c !important;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-comment {
    color: #546e7a !important;
    font-style: italic;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .cm-operator {
    color: #89ddff !important;
}
[data-theme="dark"] .view-code-wrapper .cm-s-material-darker .CodeMirror-cursor {
    border-left-color: #fff !important;
}