/* ============================================================
   admin.css - giao diện CMS Admin.
   Bảng màu lấy theo brand chính (PTE APAC: tím #442A82 / hồng #E23563)
   để giao diện quản trị đồng bộ với nhận diện thương hiệu, thiết kế sáng,
   hiện đại (card bo góc, shadow nhẹ, focus ring) thay cho giao diện
   sidebar tối/màu mù tạt của bản skeleton trước đây.
   ============================================================ */

:root {
    --admin-primary: #442a82;
    --admin-primary-dark: #341f66;
    --admin-primary-light: #f1edfb;
    --admin-accent: #e23563;
    --admin-accent-light: #fdeaf0;
    --admin-bg: #f6f7fb;
    --admin-surface: #ffffff;
    --admin-text: #1f2430;
    --admin-text-muted: #6b7280;
    --admin-border: #e8e9f1;
    --admin-success-bg: #e7f7ee;
    --admin-success-text: #15803d;
    --admin-muted-bg: #f1f2f6;
    --admin-muted-text: #6b7280;
    --admin-warning-bg: #fff6e0;
    --admin-warning-text: #92660b;
    --admin-danger: #dc2626;
    --admin-danger-bg: #fdecec;
    --admin-radius: 12px;
    --admin-radius-sm: 8px;
    --admin-shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05);
    --admin-shadow-md: 0 4px 14px rgba(16, 24, 40, 0.07);
    --admin-shadow-lg: 0 16px 40px rgba(52, 31, 102, 0.18);
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    font-family: "Inter", "Segoe UI", "Noto Sans", Arial, sans-serif;
    color: var(--admin-text);
    background-color: var(--admin-bg);
    -webkit-font-smoothing: antialiased;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 0 0.35rem;
    letter-spacing: -0.01em;
}

a {
    color: var(--admin-primary);
}

code {
    background-color: var(--admin-muted-bg);
    border-radius: 4px;
    padding: 0.1rem 0.35rem;
    font-size: 0.85em;
}

hr {
    border: none;
    border-top: 1px solid var(--admin-border);
    margin: 1.5rem 0;
}

/* ---------------- Layout khung CMS ---------------- */

.admin-shell {
    display: flex;
    min-height: 100vh;
}

.admin-sidebar {
    width: 260px;
    flex-shrink: 0;
    background-color: var(--admin-surface);
    border-right: 1px solid var(--admin-border);
    padding: 1.25rem 0 1.5rem;
    display: flex;
    flex-direction: column;
}

.admin-logo {
    font-size: 1.15rem;
    font-weight: 800;
    padding: 0 1.25rem 1.25rem;
    margin-bottom: 0.5rem;
    color: var(--admin-text);
    letter-spacing: -0.01em;
}

.admin-logo span {
    display: inline-block;
    margin-left: 0.4rem;
    background-color: var(--admin-primary);
    color: #ffffff;
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 0.15rem 0.45rem;
    border-radius: 999px;
    vertical-align: middle;
}

.admin-nav {
    display: flex;
    flex-direction: column;
    gap: 0.05rem;
    padding: 0 0.75rem;
}

.admin-nav-group {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--admin-text-muted);
    padding: 1.1rem 0.5rem 0.4rem;
}

.admin-nav-link {
    color: var(--admin-text-muted);
    padding: 0.55rem 0.75rem;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.6rem;
    border-radius: var(--admin-radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.admin-nav-link:hover {
    background-color: var(--admin-primary-light);
    color: var(--admin-primary);
    text-decoration: none;
}

.admin-nav-link.active {
    background-color: var(--admin-primary);
    color: #ffffff;
    font-weight: 600;
    box-shadow: var(--admin-shadow-sm);
}

.admin-nav-link-disabled {
    color: #c2c4cf;
    cursor: not-allowed;
}

.admin-nav-link-disabled:hover {
    background-color: transparent;
    color: #c2c4cf;
}

.soon-badge {
    margin-left: auto;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--admin-text-muted);
    background-color: var(--admin-muted-bg);
    padding: 0.1rem 0.4rem;
    border-radius: 999px;
    letter-spacing: 0.01em;
}

/* ---------------- Main / topbar / content ---------------- */

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

.admin-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: var(--admin-surface);
    border-bottom: 1px solid var(--admin-border);
    padding: 0.85rem 1.75rem;
    position: sticky;
    top: 0;
    z-index: 10;
}

.admin-content {
    padding: 1.75rem;
    flex: 1;
}

.dashboard-placeholder {
    margin-top: 1.5rem;
    padding: 1rem 1.25rem;
    background-color: var(--admin-primary-light);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    color: var(--admin-text-muted);
    line-height: 1.6;
}

/* ---------------- Dashboard ---------------- */

.dash-welcome {
    background: linear-gradient(135deg, var(--admin-primary) 0%, var(--admin-accent) 130%);
    color: #ffffff;
    border-radius: var(--admin-radius);
    padding: 1.75rem 2rem;
    box-shadow: var(--admin-shadow-lg);
    margin-bottom: 1.75rem;
}

.dash-welcome h1 {
    color: #ffffff;
    font-size: 1.4rem;
    margin-bottom: 0.3rem;
}

.dash-welcome p {
    margin: 0.15rem 0 0;
    color: rgba(255, 255, 255, 0.88);
    font-size: 0.92rem;
}

.dash-welcome .dash-brand-pill {
    display: inline-flex;
    align-items: center;
    margin-top: 0.85rem;
    background-color: rgba(255, 255, 255, 0.16);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 999px;
    padding: 0.3rem 0.85rem;
    font-size: 0.82rem;
    font-weight: 600;
}

.dash-section-title {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--admin-text);
    margin: 0 0 0.9rem;
}

.dash-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.dash-card {
    display: block;
    background-color: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    padding: 1.1rem 1.2rem;
    text-decoration: none;
    color: var(--admin-text);
    box-shadow: var(--admin-shadow-sm);
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    position: relative;
    overflow: hidden;
}

.dash-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background-color: var(--dash-card-accent, var(--admin-primary));
}

.dash-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--admin-shadow-md);
    border-color: var(--admin-border);
    text-decoration: none;
}

.dash-card-title {
    font-weight: 700;
    font-size: 0.95rem;
    margin-bottom: 0.3rem;
}

.dash-card-desc {
    font-size: 0.82rem;
    color: var(--admin-text-muted);
    line-height: 1.45;
}

/* ---------------- Brand selector ---------------- */

.brand-selector {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.brand-selector label {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--admin-text-muted);
}

.brand-selector select {
    padding: 0.4rem 0.65rem;
    border: 1px solid var(--admin-border);
    background-color: var(--admin-surface);
    border-radius: var(--admin-radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--admin-text);
}

.brand-selector select:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px var(--admin-primary-light);
}

/* ---------------- User / logout ---------------- */

.admin-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.admin-user-avatar {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--admin-primary), var(--admin-accent));
    color: #ffffff;
    font-weight: 700;
    font-size: 0.85rem;
}

.admin-user-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.admin-logout-btn {
    background-color: transparent;
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    padding: 0.4rem 0.85rem;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--admin-text-muted);
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.admin-logout-btn:hover {
    background-color: var(--admin-danger-bg);
    color: var(--admin-danger);
    border-color: #f5c6c2;
}

/* ---------------- Login page ---------------- */

.auth-layout {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at top left, #5a3aa8 0%, var(--admin-primary) 45%, var(--admin-accent) 130%);
    padding: 1.5rem;
}

.login-card {
    background-color: var(--admin-surface);
    border-radius: 16px;
    padding: 2.25rem 2.25rem 2rem;
    width: 100%;
    max-width: 380px;
    box-shadow: var(--admin-shadow-lg);
}

.login-card h1 {
    margin: 0 0 0.3rem;
    font-size: 1.4rem;
    color: var(--admin-text);
}

.login-subtitle {
    margin: 0 0 1.4rem;
    color: var(--admin-text-muted);
    font-size: 0.88rem;
    line-height: 1.5;
}

.login-error {
    background-color: var(--admin-danger-bg);
    color: var(--admin-danger);
    border: 1px solid #f5c6c2;
    border-radius: var(--admin-radius-sm);
    padding: 0.6rem 0.8rem;
    margin-bottom: 1rem;
    font-size: 0.85rem;
    line-height: 1.45;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.login-form label {
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: 0.6rem;
    color: var(--admin-text);
}

.login-form input {
    padding: 0.6rem 0.7rem;
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    font-size: 0.95rem;
    background-color: var(--admin-bg);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.login-form input:focus {
    outline: none;
    border-color: var(--admin-primary);
    background-color: var(--admin-surface);
    box-shadow: 0 0 0 3px var(--admin-primary-light);
}

.login-form button {
    margin-top: 1.4rem;
    padding: 0.65rem;
    background-color: var(--admin-primary);
    color: #ffffff;
    border: none;
    border-radius: var(--admin-radius-sm);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.05s ease;
}

.login-form button:hover {
    background-color: var(--admin-primary-dark);
}

.login-form button:active {
    transform: scale(0.99);
}

/* ============================================================
   CRUD chung (danh sách + form) - dùng cho Tin tức, Khóa học, Pages...
   ============================================================ */

.crud-toolbar {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 0.75rem;
    margin: 0 0 1.25rem;
    flex-wrap: wrap;
}

.crud-toolbar .filters {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.crud-toolbar select,
.crud-toolbar input[type="text"] {
    padding: 0.45rem 0.6rem;
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    font-size: 0.88rem;
    background-color: var(--admin-surface);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--admin-radius-sm);
    border: 1px solid var(--admin-primary);
    background-color: var(--admin-primary);
    color: #ffffff;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    line-height: 1.4;
    transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.05s ease;
    box-shadow: var(--admin-shadow-sm);
}

.btn:hover {
    background-color: var(--admin-primary-dark);
    border-color: var(--admin-primary-dark);
    color: #ffffff;
    text-decoration: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
}

.btn-secondary {
    background-color: var(--admin-surface);
    color: var(--admin-text);
    border-color: var(--admin-border);
}

.btn-secondary:hover {
    background-color: var(--admin-bg);
    border-color: var(--admin-border);
    color: var(--admin-text);
}

.btn-danger {
    background-color: var(--admin-surface);
    color: var(--admin-danger);
    border-color: #f3c6c2;
}

.btn-danger:hover {
    background-color: var(--admin-danger-bg);
    border-color: #f3c6c2;
    color: var(--admin-danger);
}

.btn-sm {
    padding: 0.3rem 0.65rem;
    font-size: 0.8rem;
}

.crud-table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    overflow: hidden;
    box-shadow: var(--admin-shadow-sm);
}

.crud-table th,
.crud-table td {
    padding: 0.7rem 0.9rem;
    border-bottom: 1px solid var(--admin-border);
    text-align: left;
    vertical-align: middle;
    font-size: 0.88rem;
}

.crud-table th {
    background-color: var(--admin-primary-light);
    color: var(--admin-primary-dark);
    font-weight: 700;
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.crud-table tbody tr:last-child td {
    border-bottom: none;
}

.crud-table tbody tr:hover {
    background-color: var(--admin-bg);
}

.crud-actions {
    display: flex;
    gap: 0.4rem;
}

/* Ảnh thumbnail nhỏ trong bảng danh sách (vd ảnh giảng viên, tài liệu). */
.crud-thumb {
    width: 44px;
    height: 44px;
    object-fit: cover;
    border-radius: var(--admin-radius-sm);
    border: 1px solid var(--admin-border);
}

.badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.badge-success {
    background-color: var(--admin-success-bg);
    color: var(--admin-success-text);
}

.badge-muted {
    background-color: var(--admin-muted-bg);
    color: var(--admin-muted-text);
}

.badge-warning {
    background-color: var(--admin-warning-bg);
    color: var(--admin-warning-text);
}

.pagination {
    display: flex;
    gap: 0.35rem;
    align-items: center;
    margin-top: 1rem;
}

/* ---------------- Form chỉnh sửa nội dung (đa ngôn ngữ) ---------------- */

.crud-form {
    background-color: var(--admin-surface);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius);
    padding: 1.5rem 1.75rem;
    box-shadow: var(--admin-shadow-sm);
    max-width: 980px;
}

.crud-form .form-row {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 1.1rem;
    max-width: 640px;
}

.crud-form .form-row.checkbox {
    flex-direction: row;
    align-items: center;
    gap: 0.5rem;
}

/* Lưới 2 cột cho các nhóm field ngắn (giá, thời lượng, lịch học...) */
.crud-form .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 0 1.5rem;
    max-width: 940px;
}

.crud-form .form-grid .form-row {
    max-width: none;
}

.crud-form label {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--admin-text);
}

.crud-form input[type="text"],
.crud-form input[type="email"],
.crud-form input[type="datetime-local"],
.crud-form input[type="number"],
.crud-form select,
.crud-form textarea {
    padding: 0.55rem 0.7rem;
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    font-size: 0.92rem;
    font-family: inherit;
    max-width: 640px;
    width: 100%;
    background-color: var(--admin-surface);
    color: var(--admin-text);
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.crud-form input:focus,
.crud-form select:focus,
.crud-form textarea:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px var(--admin-primary-light);
}

.crud-form textarea {
    resize: vertical;
}

.crud-form .crud-table input[type="text"],
.crud-form .crud-table input[type="number"],
.crud-form .crud-table textarea {
    max-width: none;
}

.form-hint {
    font-size: 0.8rem;
    color: var(--admin-text-muted);
    line-height: 1.5;
}

.lang-tabs {
    display: inline-flex;
    gap: 0.2rem;
    margin: 0.5rem 0 1rem;
    background-color: var(--admin-muted-bg);
    border-radius: var(--admin-radius-sm);
    padding: 0.25rem;
}

.lang-tab {
    padding: 0.4rem 1rem;
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--admin-text-muted);
    border-radius: 6px;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.lang-tab.active {
    color: var(--admin-primary);
    background-color: var(--admin-surface);
    box-shadow: var(--admin-shadow-sm);
}

.lang-panel {
    background-color: var(--admin-bg);
    border: 1px solid var(--admin-border);
    border-radius: var(--admin-radius-sm);
    padding: 1.1rem 1.25rem;
    margin-bottom: 1.25rem;
}

.form-actions {
    display: flex;
    gap: 0.6rem;
    margin-top: 1.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--admin-border);
}

.alert {
    padding: 0.65rem 0.95rem;
    border-radius: var(--admin-radius-sm);
    margin-bottom: 1.1rem;
    font-size: 0.88rem;
    line-height: 1.5;
}

.alert-error {
    background-color: var(--admin-danger-bg);
    color: var(--admin-danger);
    border: 1px solid #f5c6c2;
}

.alert-success {
    background-color: var(--admin-success-bg);
    color: var(--admin-success-text);
    border: 1px solid #b7e1c1;
}