/* ==========================================================================
   LEARNINGEZ UNIVERSITY - WARM PAPER / SKETCHBOOK CREAM THEME
   Bản nâng cấp toàn diện giao diện tông màu giấy phác thảo & mực bút máy cổ điển
   ========================================================================== */

/* ==========================================================================
   1. HỆ THỐNG BIẾN MÀU & ĐỒNG BỘ BOOTSTRAP 5
   ========================================================================== */
:root {
    /* Nền chính giấy phác thảo / kem ấm (Main Canvas) */
    --bg-canvas: #F4EFE6;
    
    /* Nền thẻ card, bảng nội dung, sidebar, modal (Surface - giấy ngà sáng nổi khối) */
    --bg-surface: #FCFAF6;
    --bg-surface-elevated: #FFFFFF;
    
    /* Nền phụ, header bảng, thẻ bài tập phụ (Subtle Paper) */
    --bg-subtle: #F0E9DC;
    --bg-hover: #EBE3D3;
    
    /* Viền & đường kẻ chia (Borders & Dividers - mô phỏng nét vẽ chì/mực nhẹ) */
    --border-color: #E2D9C8;
    --border-color-dark: #D3C7B0;
    --border-color-focus: #B5A78E;
    
    /* Màu chữ chính: Than chì đậm (Graphite Text) - Tuyệt đối không dùng đen tuyền #000000 */
    --text-primary: #2B2520;
    
    /* Màu chữ phụ: Tone chì nhạt (Muted / Subtext cho ngày tháng, mô tả ngắn, placeholder) */
    --text-muted: #6E6458;
    --text-subtle: #8A7F71;
    
    /* Màu điểm nhấn chính: Xanh mực bút máy cổ điển (Fountain Pen Ink Blue) */
    --primary-color: #2B5B84;
    --primary-hover: #1E4262;
    --primary-active: #16324B;
    --primary-subtle: #E3EDF4;
    
    /* Màu điểm nhấn phụ: Da cam hổ phách / Đất nung (Terracotta Amber) */
    --accent-color: #B85829;
    --accent-hover: #9E4920;
    --accent-subtle: #F9EDE5;
    
    /* Trạng thái thông báo */
    --success-color: #266336;
    --success-bg: #E3EFE6;
    --danger-color: #8B3322;
    --danger-bg: #F6E2DB;
    --info-color: #1E4262;
    --info-bg: #E3EDF4;
    --warning-color: #7A4C15;
    --warning-bg: #F7ECD9;

    /* Đồng bộ biến lõi của Bootstrap 5 */
    --bs-body-bg: var(--bg-canvas);
    --bs-body-color: var(--text-primary);
    --bs-primary: var(--primary-color);
    --bs-primary-rgb: 43, 91, 132;
    --bs-secondary-color: var(--text-muted);
    --bs-border-color: var(--border-color);
    --bs-border-color-translucent: rgba(211, 199, 176, 0.45);
    --bs-card-bg: var(--bg-surface);
    --bs-card-border-color: var(--border-color);
    --bs-tertiary-bg: var(--bg-subtle);
    --bs-light: var(--bg-canvas);
    --bs-light-rgb: 244, 239, 230;
    --bs-dark: #2B2520;
    --bs-dark-rgb: 43, 37, 32;
}

/* ==========================================================================
   2. TIÊU CHUẨN NỀN TẢNG & TYPOGRAPHY
   ========================================================================== */
html, body {
    background-color: var(--bg-canvas) !important;
    color: var(--text-primary) !important;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6,
.h1, .h2, .h3, .h4, .h5, .h6 {
    color: var(--text-primary);
    letter-spacing: -0.015em;
    font-weight: 700;
}

p, span, div, label {
    color: inherit;
}

strong, b, .fw-bold, .fw-semibold {
    color: var(--text-primary);
}

.text-dark {
    color: var(--text-primary) !important;
}

.text-muted,
.text-secondary {
    color: var(--text-muted) !important;
}

a {
    color: var(--primary-color);
    transition: color 0.15s ease-in-out;
}

a:hover, a:focus {
    color: var(--primary-hover);
}

hr {
    border-color: var(--border-color) !important;
    opacity: 0.85;
}

/* ==========================================================================
   3. THANH ĐIỀU HƯỚNG CHÍNH (NAVBAR) & CHÂN TRANG (FOOTER)
   ========================================================================== */
.bg-primary {
    background-color: var(--primary-color) !important;
}

.text-primary {
    color: var(--primary-color) !important;
}

.navbar.bg-primary {
    background-color: var(--primary-color) !important;
    border-bottom: 1px solid rgba(226, 217, 200, 0.25);
    box-shadow: 0 2px 10px rgba(43, 37, 32, 0.08) !important;
}

.navbar-brand {
    font-size: 1.25rem;
    letter-spacing: -0.3px;
    color: #FFFFFF !important;
}

.navbar-dark .navbar-nav .nav-link {
    color: #F4EFE6 !important;
    transition: color 0.15s ease;
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link:focus {
    color: #FFFFFF !important;
}

.navbar-dark .navbar-toggler {
    border-color: rgba(244, 239, 230, 0.3);
}

.avatar-circle {
    width: 32px;
    height: 32px;
    background-color: var(--accent-color);
    color: #FFFFFF;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: 0 1px 3px rgba(43, 37, 32, 0.2);
}

footer, .footer {
    background-color: var(--bg-surface) !important;
    border-top: 1px solid var(--border-color) !important;
}

footer h6 {
    color: var(--primary-color) !important;
}

footer a {
    color: var(--text-muted) !important;
}

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

/* ==========================================================================
   4. HỆ THỐNG THẺ BÌA & KHỐI BẢNG (CARDS & SURFACES)
   ========================================================================== */
.bg-light {
    background-color: var(--bg-canvas) !important;
}

.bg-white {
    background-color: var(--bg-surface) !important;
}

.card {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 10px;
    color: var(--text-primary);
    box-shadow: 0 2px 6px rgba(43, 37, 32, 0.03);
}

.card-header {
    background-color: var(--bg-subtle) !important;
    border-bottom: 1px solid var(--border-color) !important;
    color: var(--text-primary) !important;
}

.card-footer {
    background-color: var(--bg-subtle) !important;
    border-top: 1px solid var(--border-color) !important;
}

.hover-card {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    border: 1px solid var(--border-color);
    border-radius: 10px;
    overflow: hidden;
    background-color: var(--bg-surface) !important;
    box-shadow: 0 2px 6px rgba(43, 37, 32, 0.03);
}

.hover-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 22px rgba(43, 37, 32, 0.08) !important;
    border-color: var(--border-color-dark);
}

.card-img-cover {
    height: 160px;
    object-fit: cover;
    width: 100%;
    background-color: var(--bg-subtle);
}

.border,
.border-top,
.border-bottom,
.border-start,
.border-end,
.border-light {
    border-color: var(--border-color) !important;
}

/* ==========================================================================
   5. NÚT BẤM (BUTTONS) & HÀNH ĐỘNG
   ========================================================================== */
/* Nút chính (Xanh mực bút máy) */
.btn-primary {
    background-color: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: #FFFFFF !important;
    box-shadow: 0 1px 3px rgba(43, 91, 132, 0.25);
}

.btn-primary:hover, .btn-primary:focus, .btn-primary:active {
    background-color: var(--primary-hover) !important;
    border-color: var(--primary-hover) !important;
    color: #FFFFFF !important;
}

/* Nút phụ / Điểm nhấn (Cam hổ phách) */
.btn-warning {
    background-color: var(--accent-color) !important;
    border-color: var(--accent-color) !important;
    color: #FFFFFF !important;
    box-shadow: 0 1px 3px rgba(184, 88, 41, 0.25);
}

.btn-warning:hover, .btn-warning:focus, .btn-warning:active {
    background-color: var(--accent-hover) !important;
    border-color: var(--accent-hover) !important;
    color: #FFFFFF !important;
}

/* Nút viền mực bút máy */
.btn-outline-primary {
    color: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
}

.btn-outline-primary:hover, .btn-outline-primary:focus, .btn-outline-primary:active {
    background-color: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: #FFFFFF !important;
}

/* Nút viền chì nhạt */
.btn-outline-secondary {
    color: var(--text-muted) !important;
    border-color: var(--border-color-dark) !important;
}

.btn-outline-secondary:hover, .btn-outline-secondary:focus, .btn-outline-secondary:active {
    background-color: var(--bg-subtle) !important;
    border-color: var(--border-color-dark) !important;
    color: var(--text-primary) !important;
}

/* Nút giấy ngà sáng (btn-light) */
.btn-light {
    background-color: var(--bg-subtle) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

.btn-light:hover, .btn-light:focus, .btn-light:active {
    background-color: var(--bg-hover) !important;
    border-color: var(--border-color-dark) !important;
    color: var(--text-primary) !important;
}

/* Nút Bookmark Môn Học */
.btn-bookmark {
    transition: all 0.2s ease;
}

.btn-bookmark.saved {
    background-color: var(--danger-bg);
    color: var(--danger-color);
    border-color: #E4BAAE;
}

.btn-bookmark.saved:hover {
    background-color: #EFD0C7;
}

/* ==========================================================================
   6. BIỂU MẪU NHẬP LIỆU (FORMS & INPUTS)
   ========================================================================== */
.form-control,
.form-select {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-color-dark) !important;
    color: var(--text-primary) !important;
    border-radius: 8px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--bg-surface-elevated) !important;
    border-color: var(--primary-color) !important;
    box-shadow: 0 0 0 3px rgba(43, 91, 132, 0.18) !important;
    color: var(--text-primary) !important;
}

.form-control::placeholder {
    color: var(--text-muted) !important;
    opacity: 0.85;
}

.input-group-text {
    background-color: var(--bg-subtle) !important;
    border: 1px solid var(--border-color-dark) !important;
    color: var(--text-muted) !important;
}

/* ==========================================================================
   7. BẢNG DỮ LIỆU (TABLES)
   ========================================================================== */
.table {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-primary);
    color: var(--text-primary) !important;
    border-color: var(--border-color) !important;
}

.table > :not(caption) > * > * {
    background-color: var(--bg-surface);
    border-bottom-color: var(--border-color) !important;
    color: var(--text-primary);
    padding: 0.85rem 0.95rem;
}

.table thead.table-light th,
.table-light {
    background-color: var(--bg-subtle) !important;
    color: var(--text-primary) !important;
    border-bottom: 2px solid var(--border-color) !important;
    font-weight: 600;
}

.table-hover > tbody > tr:hover > * {
    background-color: var(--bg-hover) !important;
    color: var(--text-primary) !important;
}

/* ==========================================================================
   8. MENU THẢ XUỐNG & TÌM KIẾM NHANH (DROPDOWN & LIVE SEARCH)
   ========================================================================== */
.dropdown-menu {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    box-shadow: 0 8px 24px rgba(43, 37, 32, 0.08) !important;
    border-radius: 8px;
}

.dropdown-item {
    color: var(--text-primary) !important;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.dropdown-item:hover, .dropdown-item:focus {
    background-color: var(--bg-subtle) !important;
    color: var(--primary-color) !important;
}

.dropdown-divider {
    border-color: var(--border-color) !important;
}

#liveSearchResults .dropdown-item {
    white-space: normal;
    padding: 0.6rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

#liveSearchResults .dropdown-item:last-child {
    border-bottom: none;
}

#liveSearchResults .search-item-title {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9rem;
}

#liveSearchResults .search-item-sub {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* ==========================================================================
   9. HỘP THOẠI MODAL, DANH SÁCH & TAB ĐIỀU HƯỚNG
   ========================================================================== */
.modal-content {
    background-color: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 12px;
    box-shadow: 0 16px 36px rgba(43, 37, 32, 0.15) !important;
}

.modal-header, .modal-footer {
    border-color: var(--border-color) !important;
    background-color: var(--bg-subtle) !important;
}

.list-group-item {
    background-color: var(--bg-surface) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

.list-group-item.active {
    background-color: var(--primary-subtle) !important;
    border-color: var(--border-color) !important;
    color: var(--primary-color) !important;
    font-weight: 700;
}

.list-group-item-action:hover, .list-group-item-action:focus {
    background-color: var(--bg-subtle) !important;
    color: var(--text-primary) !important;
}

/* Tabs & Pills điều hướng */
.nav-pills .nav-link {
    color: var(--text-muted) !important;
    border: 1px solid var(--border-color);
    background-color: var(--bg-surface);
    transition: all 0.15s ease;
}

.nav-pills .nav-link:hover {
    background-color: var(--bg-subtle);
    color: var(--text-primary) !important;
}

.nav-pills .nav-link.active {
    background-color: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
    color: #FFFFFF !important;
}

.nav-tabs {
    border-bottom-color: var(--border-color) !important;
}

.nav-tabs .nav-link {
    color: var(--text-muted);
}

.nav-tabs .nav-link.active {
    background-color: var(--bg-surface) !important;
    border-color: var(--border-color) var(--border-color) var(--bg-surface) !important;
    color: var(--primary-color) !important;
    font-weight: 600;
}

.breadcrumb-item a {
    color: var(--primary-color) !important;
}

.breadcrumb-item.active {
    color: var(--text-muted) !important;
}

.breadcrumb-item + .breadcrumb-item::before {
    color: var(--border-color-dark) !important;
}

.pagination .page-link {
    background-color: var(--bg-surface);
    border-color: var(--border-color);
    color: var(--primary-color);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #FFFFFF;
}

/* ==========================================================================
   10. KHUNG THÔNG BÁO (ALERTS)
   ========================================================================== */
.alert-light {
    background-color: var(--bg-subtle) !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

.alert-info {
    background-color: var(--info-bg) !important;
    border-color: #BCD3E3 !important;
    color: var(--info-color) !important;
}

.alert-warning {
    background-color: var(--warning-bg) !important;
    border-color: #E5CE9F !important;
    color: var(--warning-color) !important;
}

.alert-success {
    background-color: var(--success-bg) !important;
    border-color: #BED1AE !important;
    color: var(--success-color) !important;
}

.alert-danger {
    background-color: var(--danger-bg) !important;
    border-color: #E4BAAE !important;
    color: var(--danger-color) !important;
}

/* ==========================================================================
   11. PHÂN LOẠI HUY HIỆU TÀI LIỆU (WARM PAPER DOC BADGES)
   ========================================================================== */
.badge-doc-type {
    display: inline-block !important;
    font-size: 0.76rem !important;
    padding: 5px 11px !important;
    border-radius: 6px !important;
    text-transform: uppercase !important;
    font-weight: 700 !important;
    letter-spacing: 0.3px !important;
    line-height: 1.2 !important;
    border: 1px solid transparent !important;
}

/* Tài liệu chung (Tone chì trầm) */
.badge-doc-type.badge-document, .badge-document {
    background-color: #EAE3D5 !important;
    color: #2B2520 !important;
    border-color: #D3C7B0 !important;
}

/* Giáo trình & Sách (Tone xanh rêu thảo mộc ấm) */
.badge-doc-type.badge-syllabus, .badge-doc-type.badge-textbook, .badge-syllabus, .badge-textbook {
    background-color: #E2EAD8 !important;
    color: #264A22 !important;
    border-color: #BED1AE !important;
}

/* Slide bài giảng (Tone xanh mực bút máy nhạt) */
.badge-doc-type.badge-slide, .badge-slide {
    background-color: #E0E9F1 !important;
    color: #1E4262 !important;
    border-color: #B7CCE0 !important;
}

/* Đề cương ôn tập (Tone hổ phách / đất nung vàng) */
.badge-doc-type.badge-outline, .badge-outline {
    background-color: #F7ECD9 !important;
    color: #7A4C15 !important;
    border-color: #E5CE9F !important;
}

/* Đề thi & Đáp án (Tone son đỏ trầm / gạch cổ điển) */
.badge-doc-type.badge-exam, .badge-doc-type.badge-exam_paper, .badge-exam, .badge-exam_paper {
    background-color: #F6E2DB !important;
    color: #8B3322 !important;
    border-color: #E4BAAE !important;
}

/* Khác (Tone chì xám cổ điển) */
.badge-doc-type.badge-other, .badge-other {
    background-color: #E8E2D6 !important;
    color: #4E453C !important;
    border-color: #D0C6B5 !important;
}

/* ==========================================================================
   12. BẢO TOÀN HIỂN THỊ BÀI HỌC & CÔNG THỨC TOÁN HỌC KATEX
   ========================================================================== */
.lesson-content {
    line-height: 1.85;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.lesson-content h1, .lesson-content h2, .lesson-content h3, .lesson-content h4 {
    color: var(--text-primary);
    font-weight: 700;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
}

.lesson-content h1 {
    font-size: 1.6rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.4rem;
}

.lesson-content h2 {
    font-size: 1.4rem;
    border-left: 4px solid var(--primary-color);
    padding-left: 10px;
}

.lesson-content blockquote {
    border-left: 4px solid var(--primary-color);
    padding: 10px 16px;
    color: #3A332C;
    background: var(--bg-subtle);
    border-radius: 0 8px 8px 0;
    margin: 1.25rem 0;
}

/* Công thức toán học KaTeX trên nền giấy */
.katex,
.katex-display,
.katex .base {
    color: var(--text-primary) !important;
}

.katex-display {
    overflow-x: auto;
    overflow-y: hidden;
    padding: 0.85rem 0.65rem;
    margin: 1rem 0;
    background-color: rgba(240, 233, 220, 0.5);
    border-radius: 8px;
    border: 1px dashed var(--border-color-dark);
}

.katex .mord,
.katex .mbin,
.katex .mrel,
.katex .mopen,
.katex .mclose,
.katex .mpunct,
.katex .minner {
    color: var(--text-primary) !important;
}

/* Mindmap Viewer trên nền giấy ngà */
.mindmap-container {
    position: relative;
    background: var(--bg-surface) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 0.75rem;
    overflow: hidden;
}

/* ==========================================================================
   10. HIỆU ỨNG CHUYỂN ĐỘNG & MICRO-INTERACTIONS HIỆN ĐẠI
   ========================================================================== */

/* 10.1 Keyframes Xuất hiện mượt mà (Fade In & Slide Up) */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Trạng thái chuẩn bị cho phần tử chờ cuộn tới (Scroll Animation) */
[data-animate="fade-up"] {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1), transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: opacity, transform;
}

[data-animate="fade-up"].animate-fade-in-up {
    opacity: 1;
    transform: translateY(0);
}

/* 10.2 Hiệu ứng Hover Nổi bật cho Thẻ Card (.card, .subject-card, .exam-card, .hover-card) */
.card, .subject-card, .exam-card, .hover-card {
    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.25s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.25s ease !important;
}

.card:hover, .subject-card:hover, .exam-card:hover, .hover-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px -6px rgba(43, 37, 32, 0.1), 0 4px 8px -4px rgba(43, 37, 32, 0.06) !important;
}

/* Bảo toàn tính ổn định cho phòng thi: Không nhảy giật thẻ câu hỏi khi đọc đề */
.question-card, .question-card:hover {
    transform: none !important;
}

/* 10.3 Hiệu ứng Nút bấm tương tác (Button Micro-interactions) */
.btn {
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease !important;
}

.btn:active {
    transform: scale(0.97) !important;
}

/* 10.4 Hiệu ứng Đếm giờ Phòng thi cảnh báo (Timer Pulse) */
@keyframes timerPulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.85;
    }
}

.timer-warning, .countdown-timer.warning, #timerCountdown.warning {
    animation: timerPulse 1.5s infinite ease-in-out !important;
    color: #ef4444 !important;
    display: inline-block;
}

/* 10.5 Hiệu ứng Skeleton Loading / Shimmer cho nạp dữ liệu AJAX */
@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

.skeleton-shimmer, .loading-shimmer {
    background: linear-gradient(90deg, #ede7dc 25%, #f7f3ec 50%, #ede7dc 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite linear;
    border-radius: 6px;
    display: block;
}

/* 10.6 Khả năng tiếp cận & Tôn trọng cài đặt chống chóng mặt (Reduced Motion) */
@media (prefers-reduced-motion: reduce) {
    *, ::before, ::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    [data-animate="fade-up"] {
        opacity: 1 !important;
        transform: none !important;
    }
}

/* ==========================================================================
   11. TEXT TRUNCATION & LINE CLAMP UTILITIES
   ========================================================================== */
.line-clamp-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==========================================================================
   12. TOAST NOTIFICATION COMPONENT (VANILLA JS + CSS)
   ========================================================================== */
.toast-container-custom {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 99999;
    display: flex;
    flex-direction: column;
    gap: 12px;
    max-width: 400px;
    width: calc(100% - 48px);
    pointer-events: none;
}

@media (max-width: 576px) {
    .toast-container-custom {
        top: 16px;
        right: 16px;
        left: 16px;
        width: calc(100% - 32px);
        max-width: none;
    }
}

.toast-item-custom {
    pointer-events: auto;
    background-color: #FCFAF6;
    border: 1px solid #EAE5D9;
    border-radius: 12px;
    box-shadow: 0 10px 25px -5px rgba(43, 37, 32, 0.12), 0 8px 10px -6px rgba(43, 37, 32, 0.05);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    animation: toastSlideInRight 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

@media (max-width: 576px) {
    .toast-item-custom {
        animation: toastSlideInTop 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    }
}

.toast-item-custom.toast-hiding {
    opacity: 0;
    transform: translateX(30px);
}

@media (max-width: 576px) {
    .toast-item-custom.toast-hiding {
        transform: translateY(-20px);
    }
}

.toast-content-wrapper {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-grow: 1;
    min-width: 0;
}

.toast-message {
    color: #1E293B;
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.4;
    word-break: break-word;
}

.toast-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

.toast-close-btn {
    background: none;
    border: none;
    font-size: 1.35rem;
    line-height: 1;
    color: #94A3B8;
    cursor: pointer;
    padding: 0 4px;
    margin-left: 12px;
    transition: color 0.15s ease, transform 0.15s ease;
    flex-shrink: 0;
}

.toast-close-btn:hover {
    color: #475569;
    transform: scale(1.15);
}

/* Các biến thể màu sắc theo type */
.toast-item-custom.toast-success {
    border-left: 4px solid #10b981;
}
.toast-item-custom.toast-success .toast-icon {
    color: #10b981;
}

.toast-item-custom.toast-error {
    border-left: 4px solid #ef4444;
}
.toast-item-custom.toast-error .toast-icon {
    color: #ef4444;
}

.toast-item-custom.toast-warning {
    border-left: 4px solid #f59e0b;
}
.toast-item-custom.toast-warning .toast-icon {
    color: #f59e0b;
}

.toast-item-custom.toast-info {
    border-left: 4px solid var(--primary-color, #2B5B84);
}
.toast-item-custom.toast-info .toast-icon {
    color: var(--primary-color, #2B5B84);
}

@keyframes toastSlideInRight {
    from {
        transform: translateX(110%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes toastSlideInTop {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* ==========================================================================
   Admin Subject-Centric Navigation Cards & Corner Badges
   ========================================================================== */
.admin-subject-scroll-container {
    max-height: 380px;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 6px 4px;
}
.admin-subject-scroll-container::-webkit-scrollbar {
    width: 6px;
}
.admin-subject-scroll-container::-webkit-scrollbar-thumb {
    background-color: #cbd5e1;
    border-radius: 4px;
}
.admin-subject-card {
    position: relative;
    border: 1.5px solid #e2e8f0;
    border-radius: 0.75rem;
    background: #ffffff;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    text-decoration: none !important;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.admin-subject-card:hover {
    border-color: #3b82f6;
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}
.admin-subject-card.active {
    border-color: #2563eb !important;
    background-color: #f0f7ff !important;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}
.admin-subject-card .badge-corner {
    position: absolute;
    top: -8px;
    right: -8px;
    z-index: 5;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.35rem 0.65rem;
    border-radius: 9999px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    border: 2px solid #ffffff;
    line-height: 1;
}
.admin-subject-card .badge-corner-left {
    position: absolute;
    top: -8px;
    left: -8px;
    z-index: 5;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    border: 2px solid #ffffff;
}
.admin-subject-thumb {
    width: 44px;
    height: 44px;
    border-radius: 0.5rem;
    object-fit: cover;
    flex-shrink: 0;
}