/* ==========================================================================
   Admin layout: sidebar + topbar + content area
   Theme: CSS custom properties toggled via [data-theme] on <html>
   (Bootstrap 5.1.0 has no built-in dark mode, so it's hand-rolled here)
   ========================================================================== */

:root {
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 72px;
    --topbar-height: 60px;

    --bg-body: #f4f6f9;
    --bg-content: #f4f6f9;
    --text-body: #333c47;
    --text-muted: #8a93a3;
    --border-color: #e4e7ec;
    --bg-card: #ffffff;
    --shadow: 0 1px 3px rgba(17, 24, 39, 0.08);
    --hover-soft: rgba(0, 0, 0, 0.06);

    --bg-sidebar: #1c2333;
    --bg-sidebar-hover: #29324a;
    --bg-sidebar-active: #3b5bfd;
    --text-sidebar: #aab2c5;
    --text-sidebar-muted: rgba(255, 255, 255, 0.35);
    --text-sidebar-active: #ffffff;

    --bg-topbar: #ffffff;
    --text-topbar: #333c47;

    --bg-input: #ffffff;
}

[data-theme="dark"] {
    --bg-body: #12161f;
    --bg-content: #12161f;
    --text-body: #d7dbe4;
    --text-muted: #8891a3;
    --border-color: #2a3040;
    --bg-card: #1a2030;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.45);
    --hover-soft: rgba(255, 255, 255, 0.08);

    --bg-sidebar: #0d1119;
    --bg-sidebar-hover: #1a2030;
    --bg-sidebar-active: #3b5bfd;
    --text-sidebar: #8891a3;
    --text-sidebar-muted: rgba(255, 255, 255, 0.25);
    --text-sidebar-active: #ffffff;

    --bg-topbar: #171c29;
    --text-topbar: #d7dbe4;

    /* Xám đậm cho input/select/nút "Chọn file" - Bootstrap/OS mặc định tô trắng, không theo theme tối. */
    --bg-input: #242b3d;
}

html, body {
    height: 100%;
}

body {
    background-color: var(--bg-body);
    color: var(--text-body);
    transition: background-color .2s ease, color .2s ease;
}

/* ---------- App shell ---------- */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.main-wrapper {
    flex: 1 1 auto;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

/* ---------- Sidebar ---------- */
.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
    background-color: var(--bg-sidebar);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-x: hidden;
    overflow-y: auto;
    transition: width .2s ease;
    z-index: 1030;
}

body.sidebar-collapsed .sidebar {
    width: var(--sidebar-collapsed-width);
}

.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    gap: .65rem;
    padding: 0 1.25rem;
    color: #fff;
    font-weight: 600;
    white-space: nowrap;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}

.sidebar-brand .brand-icon {
    font-size: 1.5rem;
    color: var(--bg-sidebar-active);
}

.sidebar-menu {
    padding: .5rem 0 1.5rem;
}

.menu-label {
    padding: 1.1rem 1.25rem .4rem;
    font-size: .7rem;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--text-sidebar-muted);
    white-space: nowrap;
}

.sidebar .nav-link {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .62rem 1.25rem;
    color: var(--text-sidebar);
    border-radius: 0;
    font-size: .9rem;
    cursor: pointer;
    white-space: nowrap;
}

.sidebar .nav-link i.fa:first-child {
    width: 18px;
    text-align: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.sidebar .nav-link:hover {
    background-color: var(--bg-sidebar-hover);
    color: #fff;
}

.sidebar .nav-link.active {
    background-color: var(--bg-sidebar-active);
    color: var(--text-sidebar-active);
}

.submenu-caret {
    margin-left: auto;
    font-size: .78rem;
    transition: transform .2s ease;
}

.nav-link.submenu-open .submenu-caret {
    transform: rotate(180deg);
}

.submenu {
    list-style: none;
    margin: 0;
    padding: 0;
    background-color: rgba(0, 0, 0, .15);
}

.submenu .nav-link {
    padding-left: 2.75rem;
    font-size: .85rem;
}

.submenu .nav-link i.fa:first-child {
    font-size: .55rem;
}

/* ---------- Collapsed sidebar (icon rail) ---------- */
body.sidebar-collapsed .brand-text,
body.sidebar-collapsed .link-text,
body.sidebar-collapsed .submenu-caret,
body.sidebar-collapsed .user-name,
body.sidebar-collapsed .user-caret {
    display: none;
}

body.sidebar-collapsed .sidebar-brand {
    justify-content: center;
    padding: 0;
}

body.sidebar-collapsed .sidebar .nav-link {
    justify-content: center;
    padding: .62rem .5rem;
}

body.sidebar-collapsed .submenu {
    display: none !important;
}

body.sidebar-collapsed .menu-label {
    height: 1px;
    padding: 0;
    margin: .75rem .9rem;
    border-top: 1px solid rgba(255, 255, 255, .1);
    overflow: hidden;
}

/* ---------- Topbar ---------- */
.topbar {
    height: var(--topbar-height);
    background-color: var(--bg-topbar);
    color: var(--text-topbar);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.25rem;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1020;
    box-shadow: var(--shadow);
}

.sidebar-toggle-btn,
.theme-toggle-btn {
    background: transparent;
    border: none;
    color: var(--text-topbar);
    width: 38px;
    height: 38px;
    border-radius: 8px;
    font-size: 1.05rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.sidebar-toggle-btn:hover,
.theme-toggle-btn:hover {
    background-color: var(--hover-soft);
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: .35rem;
}

.user-info .user-toggle {
    display: flex;
    align-items: center;
    gap: .55rem;
    text-decoration: none;
    color: var(--text-topbar);
    padding: .3rem .5rem;
    border-radius: 8px;
}

.user-info .user-toggle:hover {
    background-color: var(--hover-soft);
}

.user-info .user-toggle::after {
    display: none;
}

.user-avatar {
    font-size: 1.9rem;
    line-height: 1;
    color: var(--bg-sidebar-active);
}

.user-name {
    font-size: .88rem;
    font-weight: 500;
}

.user-caret {
    font-size: .75rem;
    color: var(--text-muted);
}

/* Bootstrap dropdown doesn't ship a dark variant in 5.1, so theme it manually */
.dropdown-menu {
    background-color: var(--bg-card);
    color: var(--text-body);
    border-color: var(--border-color);
    box-shadow: var(--shadow);
}

.dropdown-item {
    color: var(--text-body);
}

.dropdown-item:hover,
.dropdown-item:focus {
    background-color: var(--bg-sidebar-active);
    color: #fff;
}

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

/* Bootstrap ".modal-content" hardcode background-color: #fff; ".modal-header"/".modal-footer" hardcode
   border-color: #dee2e6 - không theo [data-theme] nên modal (VD: #modalAddMusic ở Project/Create.cshtml)
   luôn sáng trắng dù theme tối. Icon nút đóng cũng vẽ sẵn màu tối, phải lật màu bằng filter mới thấy được
   trên nền tối (giống cách Bootstrap tự làm ở class ".btn-close-white"). */
[data-theme="dark"] .modal-content {
    background-color: var(--bg-card);
    color: var(--text-body);
    border-color: var(--border-color);
}

[data-theme="dark"] .modal-header,
[data-theme="dark"] .modal-footer {
    border-color: var(--border-color);
}

[data-theme="dark"] .modal .btn-close {
    filter: invert(1) grayscale(100%) brightness(200%);
}

/* Các utility border của Bootstrap (.border, .border-top...) cũng hardcode #dee2e6 !important - dùng
   khắp nơi (modal body, form footer, card list...) nên ghi đè chung 1 lần cho theme tối. */
[data-theme="dark"] .border,
[data-theme="dark"] .border-top,
[data-theme="dark"] .border-end,
[data-theme="dark"] .border-bottom,
[data-theme="dark"] .border-start {
    border-color: var(--border-color) !important;
}

/* Checkbox/radio ".form-check-input" cũng hardcode nền trắng khi chưa check - dùng trong modal chọn
   nhạc nền (Project/Create.cshtml) nên theme luôn cho đồng bộ. */
[data-theme="dark"] .form-check-input {
    background-color: var(--bg-input);
    border-color: var(--border-color);
}

[data-theme="dark"] .form-check-input:checked {
    background-color: var(--bg-sidebar-active);
    border-color: var(--bg-sidebar-active);
}

/* ---------- Content area ---------- */
.content-area {
    flex: 1 1 auto;
    padding: 1.5rem;
    background-color: var(--bg-content);
}

.content-footer {
    padding: 1rem 1.5rem;
    font-size: .82rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
}

.card {
    background-color: var(--bg-card);
    color: var(--text-body);
    border-color: var(--border-color);
}

/* Bootstrap ".table" hardcode color: #212529; border-color: #dee2e6; (chữ/viền tối) nên ở theme tối
   bảng bị chữ tối trên nền tối gần như không đọc được - ghi đè lại theo biến theme, kèm luôn màu
   nền/màu chữ khi hover, striped, active (vốn cũng hardcode tông sáng qua --bs-table-*). */
[data-theme="dark"] .table {
    --bs-table-striped-color: var(--text-body);
    --bs-table-striped-bg: rgba(255, 255, 255, 0.04);
    --bs-table-active-color: var(--text-body);
    --bs-table-active-bg: rgba(255, 255, 255, 0.08);
    --bs-table-hover-color: var(--text-body);
    --bs-table-hover-bg: rgba(255, 255, 255, 0.05);
    color: var(--text-body);
    border-color: var(--border-color);
}

.page-header {
    margin-bottom: 1.25rem;
}

.page-title {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: .2rem;
}

.page-subtitle {
    color: var(--text-muted);
    margin-bottom: 0;
    font-size: .9rem;
}

.stat-card .card-body {
    padding: 1.1rem 1.25rem;
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.stat-value {
    font-size: 1.35rem;
    font-weight: 700;
    line-height: 1.15;
}

.stat-label {
    font-size: .82rem;
    color: var(--text-muted);
}

/* ---------- Form ---------- */
.form-label {
    font-weight: 600;
}

/* Bootstrap ".text-muted" hardcode color: #6c757d !important nên không tự đổi theo [data-theme] - ghi đè
   lại cho theme tối bằng đúng biến --text-muted để tương phản tốt trên nền tối. */
[data-theme="dark"] .text-muted {
    color: var(--text-muted) !important;
}

/* Bootstrap mặc định tô input/select nền trắng cứng, không tự đổi theo [data-theme] -> set lại cho theme tối. */
[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select,
[data-theme="dark"] .input-group-text {
    background-color: var(--bg-input);
    color: var(--text-body);
    border-color: var(--border-color);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: var(--bg-input);
    color: var(--text-body);
    border-color: var(--bg-sidebar-active);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] .form-control:disabled,
[data-theme="dark"] .form-select:disabled {
    background-color: var(--bg-card);
    color: var(--text-muted);
}

/* Nút "Choose File"/"Browse" do trình duyệt tự vẽ cho input[type=file] - cũng không theo theme tối. */
[data-theme="dark"] .form-control[type="file"]::file-selector-button,
[data-theme="dark"] .form-control[type="file"]::-webkit-file-upload-button {
    background-color: var(--bg-input);
    color: var(--text-body);
    border-color: var(--border-color);
}

/* Nhóm field theo chủ đề trong form (VD: Project/Create.cshtml - nhóm "Tiêu đề", "Phụ đề"...). */
.form-section-title {
    font-size: .78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .04em;
    color: var(--text-muted);
    margin-bottom: .9rem;
    padding-bottom: .5rem;
    border-bottom: 1px solid var(--border-color);
}

/* ---------- Project/Create: khung xem trước tiêu đề/phụ đề ---------- */
.project-preview-sticky {
    position: sticky;
    top: calc(var(--topbar-height) + 1.5rem);
}

.preview-box {
    min-height: 220px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: background-color .2s ease;
}

.preview-title {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
    word-break: break-word;
}

.preview-sub {
    font-size: 1.1rem;
    line-height: 1.2;
    word-break: break-word;
}

.form-section + .form-section {
    margin-top: 1.75rem;
}

/* ---------- Select2 (".select2-basic") ---------- */
/* select2.css không tự set height cho ".select2-selection--single" (chỉ line-height: 28px trên phần chữ),
   nên ô select2 thấp hơn hẳn ".form-control"/".form-select" của Bootstrap (height tính ra ~38px ở desktop).
   Canh lại bằng đúng công thức Bootstrap dùng cho form-control/form-select: calc(1.5em + .75rem + 2px). */
.select2-container--default .select2-selection--single {
    height: calc(1.5em + .75rem + 2px) !important;
    display: flex !important;
    align-items: center;
    padding: 0 .75rem !important;
    border-radius: .25rem !important;
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    padding: 0 !important;
    line-height: normal !important;
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    height: 100% !important;
    top: 0 !important;
    right: .5rem !important;
}

/* Phòng khi có select2 multiple dùng lại sau này - canh min-height cho khớp luôn. */
.select2-container--default .select2-selection--multiple {
    min-height: calc(1.5em + .75rem + 2px) !important;
}

/* select2.css hardcode toàn bộ màu nền/chữ/viền sáng (#fff, #444, #aaa...), không theo [data-theme] -
   ghi đè cho theme tối: ô chọn, dropdown kết quả, ô tìm kiếm, option disabled/đã chọn. Riêng option đang
   highlight dùng luôn var(--bg-sidebar-active) cho đồng bộ màu nhấn với menu/dropdown-item của site. */
[data-theme="dark"] .select2-container--default .select2-selection--single {
    background-color: var(--bg-input);
    border-color: var(--border-color);
}

[data-theme="dark"] .select2-container--default .select2-selection--single .select2-selection__rendered {
    color: var(--text-body);
}

[data-theme="dark"] .select2-container--default .select2-selection--single .select2-selection__placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] .select2-container--default .select2-selection--single .select2-selection__arrow b {
    border-color: var(--text-muted) transparent transparent transparent;
}

[data-theme="dark"] .select2-container--default.select2-container--open .select2-selection--single .select2-selection__arrow b {
    border-color: transparent transparent var(--text-muted) transparent;
}

[data-theme="dark"] .select2-container--default.select2-container--disabled .select2-selection--single {
    background-color: var(--bg-card);
    color: var(--text-muted);
}

[data-theme="dark"] .select2-container--default .select2-selection--multiple {
    background-color: var(--bg-input);
    border-color: var(--border-color);
}

[data-theme="dark"] .select2-container--default .select2-selection--multiple .select2-selection__placeholder {
    color: var(--text-muted);
}

[data-theme="dark"] .select2-dropdown {
    background-color: var(--bg-card);
    border-color: var(--border-color);
}

[data-theme="dark"] .select2-container--default .select2-results__option {
    color: var(--text-body);
}

[data-theme="dark"] .select2-container--default .select2-results__option[aria-disabled="true"] {
    color: var(--text-muted);
}

[data-theme="dark"] .select2-container--default .select2-results__option[aria-selected="true"] {
    background-color: var(--hover-soft);
}

[data-theme="dark"] .select2-container--default .select2-results__option--highlighted[aria-selected] {
    background-color: var(--bg-sidebar-active);
    color: #fff;
}

[data-theme="dark"] .select2-container--default .select2-search--dropdown .select2-search__field,
[data-theme="dark"] .select2-search--inline .select2-search__field {
    background-color: var(--bg-input);
    color: var(--text-body);
    border-color: var(--border-color);
}

/* ---------- Toast (site.js ToastMessage) ---------- */
/* Bootstrap 5.1.0 (bản đang dùng) chưa có class ".text-bg-*" (chỉ có từ 5.3), nên toast luôn rơi về nền
   mặc định ".toast { background-color: rgba(255,255,255,.85) }" - không hề có màu theo loại, và ở theme
   tối thì chữ sáng trên nền gần trắng gần như không đọc được. Bổ sung lại đúng 3 class còn thiếu, dùng
   nền màu cố định (không đổi theo theme) vì toast success/error/warning cần luôn nổi bật, dễ nhận biết
   bất kể theme sáng/tối. */
.toast.text-bg-success,
.toast.text-bg-danger,
.toast.text-bg-warning {
    background-clip: padding-box;
    border: 0;
}

.toast.text-bg-success {
    color: #fff;
    background-color: #198754;
}

.toast.text-bg-danger {
    color: #fff;
    background-color: #dc3545;
}

.toast.text-bg-warning {
    color: #000;
    background-color: #ffc107;
}

/* ---------- Small screens: keep usable, full off-canvas can come later ---------- */
@media (max-width: 768px) {
    .user-name {
        display: none;
    }
}