/* ============================================================
   YouTube Manager — Design System (app.css)
   Nền tảng: Bootstrap 5.3. File này định nghĩa token + app shell
   + component chung cho MỌI trang. Style riêng của trang đặt
   trong <style> của trang đó.
   ============================================================ */

:root {
    /* Màu chủ đạo */
    --app-primary: #2563eb;
    --app-primary-hover: #1d4ed8;
    --app-primary-soft: #eff6ff;
    --app-danger: #dc2626;
    --app-danger-soft: #fef2f2;
    --app-success: #16a34a;
    --app-success-soft: #f0fdf4;
    --app-warning: #d97706;
    --app-warning-soft: #fffbeb;

    /* Bề mặt & chữ */
    --app-bg: #f6f8fb;
    --app-surface: #ffffff;
    --app-border: #e5e9f0;
    --app-text: #0f172a;
    --app-text-muted: #64748b;

    /* Kích thước */
    --app-sidebar-w: 240px;
    --app-topbar-h: 60px;
    --app-radius: 12px;
    --app-radius-sm: 8px;
    --app-shadow: 0 1px 2px rgba(15, 23, 42, .05);
    --app-shadow-lg: 0 10px 30px rgba(15, 23, 42, .12);

    /* Đồng bộ biến Bootstrap hay dùng */
    --bs-primary: var(--app-primary);
    --bs-link-color: var(--app-primary);
    --bs-body-bg: var(--app-bg);
    --bs-body-color: var(--app-text);
    --bs-border-color: var(--app-border);
}

html, body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--app-bg);
    color: var(--app-text);
    font-size: 14px;
}

h1, h2, h3, h4, h5 { font-weight: 700; letter-spacing: -0.01em; }

a { color: var(--app-primary); text-decoration: none; }
a:hover { color: var(--app-primary-hover); }

/* ============ APP SHELL ============ */

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

/* --- Sidebar --- */
.app-sidebar {
    width: var(--app-sidebar-w);
    background: var(--app-surface);
    border-right: 1px solid var(--app-border);
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 1040;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.app-sidebar .brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 16px 20px;
    font-size: 16px;
    font-weight: 800;
    color: var(--app-text);
    border-bottom: 1px solid var(--app-border);
    min-height: var(--app-topbar-h);
}

.app-sidebar .brand i {
    color: #ff0033;
    font-size: 22px;
}

.app-sidebar .nav-section {
    padding: 12px 12px 4px;
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--app-text-muted);
}

.app-sidebar .side-nav {
    padding: 8px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.app-sidebar .side-nav a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--app-radius-sm);
    color: var(--app-text-muted);
    font-weight: 500;
    transition: background .15s, color .15s;
}

.app-sidebar .side-nav a i {
    width: 18px;
    text-align: center;
    font-size: 15px;
}

.app-sidebar .side-nav a:hover {
    background: var(--app-bg);
    color: var(--app-text);
}

.app-sidebar .side-nav a.active {
    background: var(--app-primary-soft);
    color: var(--app-primary);
    font-weight: 600;
}

.app-sidebar .sidebar-footer {
    margin-top: auto;
    padding: 12px;
    border-top: 1px solid var(--app-border);
    font-size: 12px;
    color: var(--app-text-muted);
}

/* --- Vùng nội dung --- */
.app-main {
    flex: 1;
    margin-left: var(--app-sidebar-w);
    display: flex;
    flex-direction: column;
    min-width: 0;
}

/* --- Topbar --- */
.app-topbar {
    height: var(--app-topbar-h);
    background: var(--app-surface);
    border-bottom: 1px solid var(--app-border);
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 1030;
}

.app-topbar .page-heading {
    font-size: 16px;
    font-weight: 700;
    margin: 0;
}

.app-topbar .topbar-spacer { flex: 1; }

.app-topbar .user-chip {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 5px 10px 5px 6px;
    border: none;
    background: none;
    border-radius: 999px;
    cursor: pointer;
    transition: background .15s;
}

.app-topbar .user-chip:hover { background: var(--app-bg); }

.app-topbar .user-chip img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.app-topbar .user-chip .user-name {
    font-weight: 600;
    font-size: 13px;
    max-width: 160px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-toggle-btn {
    border: none;
    background: none;
    font-size: 18px;
    color: var(--app-text-muted);
    padding: 8px 10px;
    border-radius: var(--app-radius-sm);
    display: none;
}

.sidebar-toggle-btn:hover { background: var(--app-bg); color: var(--app-text); }

/* --- Nội dung trang --- */
.app-content {
    padding: 24px;
    max-width: 1320px;
    width: 100%;
    margin: 0 auto;
}

/* Tiêu đề trang + hàng hành động */
.page-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 20px;
}

.page-header h1 {
    font-size: 22px;
    margin: 0;
}

.page-header .page-sub {
    color: var(--app-text-muted);
    margin: 4px 0 0;
    font-size: 13px;
}

.page-actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============ COMPONENTS ============ */

/* Card chuẩn */
.app-card {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow);
}

.app-card .app-card-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--app-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    font-weight: 600;
}

.app-card .app-card-body { padding: 18px; }

/* Ô thống kê */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.stat-tile {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    padding: 14px 16px;
    box-shadow: var(--app-shadow);
}

.stat-tile .stat-label {
    font-size: 12px;
    color: var(--app-text-muted);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
}

.stat-tile .stat-value {
    font-size: 22px;
    font-weight: 800;
    margin-top: 2px;
    line-height: 1.2;
}

.stat-tile .stat-value.text-ok { color: var(--app-success); }
.stat-tile .stat-value.text-warn { color: var(--app-warning); }
.stat-tile .stat-value.text-bad { color: var(--app-danger); }

/* Bảng chuẩn */
.app-table-wrap {
    overflow-x: auto;
    border-radius: var(--app-radius);
}

.table.app-table {
    margin: 0;
    background: var(--app-surface);
    font-size: 13.5px;
}

.table.app-table thead th {
    background: #f8fafc;
    color: var(--app-text-muted);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: .04em;
    font-weight: 700;
    border-bottom: 1px solid var(--app-border);
    padding: 10px 14px;
    white-space: nowrap;
}

.table.app-table tbody td {
    padding: 12px 14px;
    vertical-align: middle;
    border-color: var(--app-border);
}

.table.app-table tbody tr:hover { background: #fafbfe; }

/* Badge trạng thái */
.badge-soft {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 999px;
    padding: 3px 10px;
}

.badge-soft.badge-blue { background: var(--app-primary-soft); color: var(--app-primary); }
.badge-soft.badge-green { background: var(--app-success-soft); color: var(--app-success); }
.badge-soft.badge-red { background: var(--app-danger-soft); color: var(--app-danger); }
.badge-soft.badge-amber { background: var(--app-warning-soft); color: var(--app-warning); }
.badge-soft.badge-gray { background: #f1f5f9; color: var(--app-text-muted); }

/* Nút — chuẩn hóa toàn site trên nền Bootstrap */
.btn {
    border-radius: var(--app-radius-sm);
    font-weight: 600;
    font-size: 13.5px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;              /* khoảng cách icon–chữ đồng nhất mọi nút */
    line-height: 1.25;
    vertical-align: middle;
}
.btn-primary { background: var(--app-primary); border-color: var(--app-primary); }
.btn-primary:hover { background: var(--app-primary-hover); border-color: var(--app-primary-hover); }

/* Icon trong nút: để gap lo khoảng cách -> triệt tiêu mọi margin lẻ (kể cả .me-*/.ms-* của Bootstrap) cho đều */
.btn > i { margin: 0 !important; line-height: 1; }

/* Nút chỉ có icon: vuông đều. Chỉ áp cho các class CHẮC CHẮN chỉ có icon
   (KHÔNG dùng :only-child vì nó khớp nhầm cả nút icon+chữ — text không tính là phần tử anh em). */
.btn-icon, .action-btn, .toggle-btn {
    padding: 0 !important;
    width: 32px;
    aspect-ratio: 1;
    flex: 0 0 auto;
}
.btn-lg.btn-icon { width: 40px; }

/* Form controls */
.form-control, .form-select {
    border-radius: var(--app-radius-sm);
    border-color: var(--app-border);
    font-size: 13.5px;
}

.form-control:focus, .form-select:focus {
    border-color: var(--app-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, .15);
}

.form-label { font-weight: 600; font-size: 13px; margin-bottom: 4px; }

/* Empty state */
.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--app-text-muted);
}

.empty-state i {
    font-size: 40px;
    opacity: .35;
    margin-bottom: 12px;
    display: block;
}

.empty-state .empty-title {
    font-weight: 700;
    color: var(--app-text);
    margin-bottom: 4px;
}

/* Avatar tròn */
.avatar-sm { width: 32px; height: 32px; border-radius: 50%; object-fit: cover; }
.avatar-md { width: 44px; height: 44px; border-radius: 50%; object-fit: cover; }
.avatar-lg { width: 72px; height: 72px; border-radius: 50%; object-fit: cover; }

/* Alert bo tròn nhẹ */
.alert { border-radius: var(--app-radius-sm); font-size: 13.5px; }

/* Dropdown user */
.dropdown-menu {
    border-radius: var(--app-radius-sm);
    border-color: var(--app-border);
    box-shadow: var(--app-shadow-lg);
    font-size: 13.5px;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 991.98px) {
    .app-sidebar {
        transform: translateX(-100%);
        transition: transform .2s ease;
        box-shadow: none;
    }

    .app-sidebar.open {
        transform: translateX(0);
        box-shadow: var(--app-shadow-lg);
    }

    .app-main { margin-left: 0; }

    .sidebar-toggle-btn { display: inline-flex; }

    .app-content { padding: 16px; }

    .sidebar-backdrop {
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, .4);
        z-index: 1039;
        display: none;
    }

    .sidebar-backdrop.show { display: block; }
}