:root {
    --bg: #f4f6fb;
    --surface: #ffffff;
    --text: #1f2937;
    --muted: #6b7280;
    --border: #e5e7eb;
    --primary: #4f46e5;
    --primary-soft: #eef2ff;
    --danger: #dc2626;
}
@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f172a;
        --surface: #1e293b;
        --text: #e5e7eb;
        --muted: #94a3b8;
        --border: #334155;
        --primary: #818cf8;
        --primary-soft: #312e81;
    }
}

* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}
a { color: var(--primary); }

.topbar {
    display: flex; align-items: center; justify-content: space-between;
    padding: 14px 24px; background: var(--surface); border-bottom: 1px solid var(--border);
    position: sticky; top: 0; z-index: 10;
}
.brand { font-size: 22px; font-weight: 800; text-decoration: none; color: var(--text); }
.brand span { color: var(--primary); font-weight: 500; }

.btn {
    display: inline-block; padding: 9px 16px; border-radius: 8px; border: 0; cursor: pointer;
    background: var(--primary); color: #fff; text-decoration: none; font-size: 14px; font-weight: 600;
}
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: var(--danger); padding: 6px 12px; font-size: 13px; }

.menu {
    display: flex; gap: 8px; padding: 14px 24px; overflow-x: auto;
    background: var(--surface); border-bottom: 1px solid var(--border);
}
.menu a {
    white-space: nowrap; padding: 8px 16px; border-radius: 999px; text-decoration: none;
    color: var(--text); border: 1px solid var(--border); font-weight: 500;
}
.menu a.active, .menu a:hover { background: var(--primary-soft); border-color: var(--primary); color: var(--primary); }

.submenu { padding-top: 10px; padding-bottom: 10px; background: var(--bg); }
.submenu a { font-size: 13px; padding: 6px 12px; background: var(--surface); }

.group { margin-bottom: 32px; }
.group-title { display: flex; align-items: center; gap: 8px; font-size: 18px; margin: 0 0 12px; }
.group-title a { color: var(--text); text-decoration: none; }
.group-title a:hover { color: var(--primary); }
.group-title small {
    font-size: 12px; font-weight: 600; color: var(--muted);
    background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 1px 8px;
}

.inline-form { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; margin-bottom: 8px; }
.inline-form label { margin-bottom: 0; }
.inline-form .grow { flex: 1; min-width: 180px; }
.inline-form .icon-input { width: 170px; }
#icon-preview { color: var(--primary); margin-left: 4px; }
.bi { color: var(--primary); }
.menu a.active .bi, .menu a:hover .bi { color: inherit; }
.panel h3 { font-size: 15px; margin: 20px 0 8px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
    display: inline-flex; align-items: center; gap: 6px; margin: 0;
    padding: 5px 6px 5px 12px; border: 1px solid var(--border); border-radius: 999px; font-size: 13px;
}
.chip small { color: var(--muted); }
.chip button {
    border: 0; background: transparent; color: var(--muted); cursor: pointer;
    font-size: 16px; line-height: 1; padding: 0 6px; border-radius: 999px;
}
.chip button:hover { color: #fff; background: var(--danger); }
.muted { color: var(--muted); font-size: 13px; }

.container { max-width: 1200px; margin: 0 auto; padding: 24px 16px; }
.container.narrow { max-width: 820px; }

/* Header trang hiển thị: topbar + menu cùng dính trên cùng */
.site-header { position: sticky; top: 0; z-index: 10; }
.site-header .topbar { position: static; }
.btn-add { display: inline-flex; align-items: center; gap: 6px; }
.btn-add .bi { color: inherit; }

/* Menu cuộn ngang, ẩn thanh cuộn */
.menu { scrollbar-width: none; -webkit-overflow-scrolling: touch; scroll-snap-type: x proximity; }
.menu::-webkit-scrollbar { display: none; }
.menu a { scroll-snap-align: start; flex-shrink: 0; }

.search-box { position: relative; margin-bottom: 20px; }
.search-box .bi {
    position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
    color: var(--muted); pointer-events: none;
}
.search {
    width: 100%; padding: 12px 16px 12px 40px; font-size: 16px; /* 16px để iOS không tự phóng to */
    border: 1px solid var(--border); border-radius: 10px; background: var(--surface); color: var(--text);
}
.search:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft); }

.grid {
    display: grid; gap: 16px;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
}
.card {
    display: flex; flex-direction: column; align-items: center; text-align: center; gap: 6px; min-width: 0;
    padding: 20px 12px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
    text-decoration: none; color: var(--text); transition: transform .15s, box-shadow .15s, border-color .15s;
    -webkit-tap-highlight-color: transparent;
}
@media (hover: hover) {
    .card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,.08); border-color: var(--primary); }
}
.card:active { transform: scale(.96); border-color: var(--primary); }
.card img { width: 64px; height: 64px; object-fit: contain; border-radius: 12px; margin-bottom: 6px; }
.card strong {
    font-size: 15px; max-width: 100%;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card small { color: var(--muted); font-size: 12px; max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tag {
    font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--primary-soft); color: var(--primary);
    max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.empty { text-align: center; color: var(--muted); padding: 40px 0; }

.panel {
    background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
    padding: 24px; margin-bottom: 24px;
}
.panel h1, .panel h2 { margin-top: 0; }
label { display: block; margin-bottom: 14px; font-weight: 600; font-size: 14px; }
input[type=text], input[type=url], input[type=password], input[type=file], select {
    display: block; width: 100%; margin-top: 6px; padding: 10px 12px; font-size: 14px;
    border: 1px solid var(--border); border-radius: 8px; background: var(--bg); color: var(--text);
}
fieldset { border: 1px dashed var(--border); border-radius: 10px; padding: 12px 16px 0; margin: 0 0 14px; }
legend { font-size: 13px; color: var(--muted); padding: 0 6px; }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; }
.alert ul { margin: 0; padding-left: 18px; }
.alert.success { background: #dcfce7; color: #166534; }
.alert.error { background: #fee2e2; color: #991b1b; }

.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { padding: 8px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
.table form { margin: 0; }
.mini { width: 28px; height: 28px; object-fit: contain; }

/* ---------- Trang quản trị (add.php) ---------- */
.topbar-actions { display: flex; gap: 8px; }
.btn-icon { display: inline-flex; align-items: center; gap: 6px; }
.btn .bi { color: inherit; }
.btn-submit { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 11px 20px; }
.admin .panel { scroll-margin-top: 130px; }   /* chừa chỗ cho header dính khi bấm menu chuyển nhanh */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.form-grid > legend { grid-column: 1 / -1; }
.admin code { font-size: 12px; background: var(--bg); padding: 1px 5px; border-radius: 4px; }
.site-table .col-action { text-align: right; white-space: nowrap; }
.site-table .btn-danger { display: inline-flex; align-items: center; gap: 4px; }
.site-table .col-url a { word-break: break-all; }
.list-search { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.list-search .search-box { flex: 1; margin: 0; }
.list-search .search { padding-top: 9px; padding-bottom: 9px; font-size: 14px; }
.list-search .btn { padding: 10px 16px; white-space: nowrap; }

.pagination {
    display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px;
    margin-top: 16px;
}
.page-info { font-size: 13px; color: var(--muted); }
.page-links { display: flex; gap: 4px; flex-wrap: wrap; }
.page-links a, .page-links span {
    min-width: 36px; height: 36px; padding: 0 10px; border-radius: 8px;
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 14px; text-decoration: none; color: var(--text); border: 1px solid var(--border);
}
.page-links a:hover { border-color: var(--primary); color: var(--primary); }
.page-links .bi { color: inherit; }
.page-links .current { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.page-links .disabled { opacity: .4; }
.page-links .dots { border-color: transparent; min-width: 20px; padding: 0; }

.chip .chip-edit { font-size: 13px; }
.chip .chip-edit:hover { background: var(--primary); color: #fff; }
.chip .chip-edit .bi { color: inherit; }

.dialog {
    width: min(440px, calc(100vw - 32px)); padding: 0; border: 1px solid var(--border); border-radius: 14px;
    background: var(--surface); color: var(--text); box-shadow: 0 20px 50px rgba(0,0,0,.3);
}
.dialog::backdrop { background: rgba(15, 23, 42, .55); }
.dialog form { padding: 20px; }
.dialog h2 { margin: 0 0 16px; font-size: 18px; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }
.dialog-actions .btn { display: inline-flex; align-items: center; gap: 6px; }

/* Ô đổi loại website trong danh sách */
.cat-change { margin: 0; }
.cat-change select {
    margin: 0; padding: 6px 28px 6px 8px; font-size: 13px; max-width: 220px;
    background-color: transparent; border-color: transparent; cursor: pointer;
}
.cat-change select:hover, .cat-change select:focus { border-color: var(--border); background-color: var(--bg); }
.cat-change.saving { opacity: .5; pointer-events: none; }

.parent-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 20px 0 8px; }
.parent-row h3 { margin: 0; }
.parent-row h3 small { font-weight: 400; font-size: 12px; }
.parent-row form { margin: 0; }
.parent-row .btn-danger { padding: 6px 10px; }

/* Tablet: thu gọn bảng */
@media (max-width: 1023px) {
    .admin .site-table .col-cat { font-size: 13px; color: var(--muted); }
}

/* Điện thoại: form 1 cột, bảng chuyển thành danh sách thẻ */
@media (max-width: 599px) {
    .topbar-actions { gap: 6px; }
    .btn-icon { padding: 8px 10px; }
    .btn-icon span { display: none; }       /* chỉ hiện icon */
    .btn-icon .bi { font-size: 17px; }

    .container.admin { padding: 12px 10px; }
    .admin .panel { padding: 16px; border-radius: 12px; margin-bottom: 16px; scroll-margin-top: 110px; }
    .admin .panel h1 { font-size: 22px; }
    .admin .panel h2 { font-size: 18px; }
    .form-grid { grid-template-columns: 1fr; }
    .admin input[type=text], .admin input[type=url], .admin input[type=password],
    .admin input[type=file], .admin select { font-size: 16px; }   /* tránh iOS tự phóng to */
    .admin fieldset { padding: 10px 12px 0; }
    .btn-submit { width: 100%; padding: 13px; font-size: 15px; }

    .site-table thead { display: none; }
    .site-table, .site-table tbody { display: block; }
    .site-table tr {
        display: grid; grid-template-columns: 36px 1fr auto; grid-template-areas: "logo name action" "logo cat action";
        align-items: center; column-gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--border);
    }
    .site-table td { display: block; padding: 0; border: 0; }
    .site-table .col-logo { grid-area: logo; }
    .site-table .col-name { grid-area: name; font-weight: 600; }
    .site-table .col-cat { grid-area: cat; font-size: 12px; color: var(--muted); }
    .site-table .cat-change select {
        max-width: 100%; margin-top: 2px; padding: 4px 24px 4px 6px; color: var(--muted);
        border-color: var(--border); background-color: var(--bg);   /* trên điện thoại luôn hiện khung để biết bấm được */
    }
    .site-table .col-url { display: none; }
    .site-table .col-action { grid-area: action; }
    .site-table .mini { width: 36px; height: 36px; }
    .site-table .btn-danger { padding: 9px 11px; }
    .site-table .btn-danger span { display: none; }

    .inline-form { flex-direction: column; align-items: stretch; gap: 12px; }
    .inline-form .icon-input, .inline-form .grow { width: auto; min-width: 0; }
    .chip { font-size: 13px; padding: 4px 4px 4px 12px; }
    .chip button { min-width: 30px; min-height: 30px; font-size: 18px; }  /* vùng chạm đủ lớn */
}

@media (max-width: 599px) {
    .pagination { justify-content: center; }
    .page-info { width: 100%; text-align: center; }
    .page-links { gap: 3px; }
    .page-links a, .page-links span { min-width: 34px; height: 38px; padding: 0 6px; }
    .page-links .far { display: none; }   /* chỉ giữ trang hiện tại ±1, trang đầu và cuối */
    .list-search .search { font-size: 16px; }
}

/* ---------- Tablet (768px – 1023px) ---------- */
@media (max-width: 1023px) {
    .grid { grid-template-columns: repeat(5, 1fr); gap: 14px; }
    .card { padding: 16px 10px; }
    .card img { width: 56px; height: 56px; }
    .card strong { font-size: 14px; }
}

/* ---------- Mobile lớn / tablet dọc nhỏ (600px – 767px) ---------- */
@media (max-width: 767px) {
    .grid { grid-template-columns: repeat(4, 1fr); gap: 12px; }
    .container { padding: 16px 12px; }
    .group { margin-bottom: 24px; }
    .group-title { font-size: 16px; }
}

/* ---------- Điện thoại (< 600px): lưới dạng biểu tượng ứng dụng ---------- */
@media (max-width: 599px) {
    .topbar { padding: 10px 12px; }
    .brand { font-size: 19px; }
    .btn-add { padding: 8px 10px; }
    .btn-add span { display: none; }          /* chỉ hiện dấu + */
    .btn-add .bi { font-size: 18px; }

    .menu { gap: 6px; padding: 10px 12px; }
    .menu a { padding: 7px 12px; font-size: 14px; }
    .submenu { padding-top: 8px; padding-bottom: 8px; }
    .submenu a { font-size: 13px; padding: 6px 10px; }

    .search-box { margin-bottom: 16px; }
    .search { padding-top: 10px; padding-bottom: 10px; }

    .grid { grid-template-columns: repeat(3, 1fr); gap: 10px; }
    .card { padding: 12px 6px; gap: 4px; border-radius: 12px; }
    .card img { width: 44px; height: 44px; border-radius: 10px; margin-bottom: 4px; }
    .card strong { font-size: 13px; line-height: 1.25; }
    .card small { display: none; }           /* ẩn domain cho gọn */
    .tag { font-size: 10px; padding: 1px 6px; }
}

/* Điện thoại rất nhỏ (< 360px) */
@media (max-width: 359px) {
    .grid { grid-template-columns: repeat(2, 1fr); }
}