/*
 * NB Tool UI kit – class dùng chung cho mọi công cụ để giao diện đồng bộ.
 * Dùng trong HTML của tool: .nbt-row, .nbt-field, .nbt-label, .nbt-input, .nbt-btn, .nbt-btn--ghost,
 * .nbt-result, .nbt-table, .nbt-note, .nbt-grid-2, .nbt-grid-3, .nbt-drop.
 * Màu sắc ăn theo biến --nbt-* trong cài đặt.
 */

.nbt-tool {
	--nbt-primary: #1d4ed8;
	--nbt-text: #0f172a;
	--nbt-card: #fff;
	--nbt-border: #e2e8f0;
	--nbt-success: #16a34a;
	--nbt-warning: #d97706;
	--nbt-danger: #dc2626;
	--nbt-radius: 12px;
	font-size: 15px;
	line-height: 1.55;
}

.nbt-tool .nbt-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: flex-end; margin-bottom: 12px; }
.nbt-tool .nbt-grid-2 { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.nbt-tool .nbt-grid-3 { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.nbt-tool .nbt-field { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
/* Co giãn ngang chỉ khi các ô xếp thành hàng. */
.nbt-tool .nbt-row > .nbt-field { flex: 1 1 200px; }
.nbt-tool .nbt-label { font-weight: 600; font-size: .9em; }

.nbt-tool .nbt-input,
.nbt-tool .nbt-select,
.nbt-tool .nbt-textarea {
	width: 100%;
	min-height: 42px;
	margin: 0;
	padding: 8px 12px;
	font: inherit;
	color: var(--nbt-text);
	background: var(--nbt-card);
	border: 1px solid var(--nbt-border);
	border-radius: calc(var(--nbt-radius) * .66);
	box-shadow: none;
	outline: none;
	transition: border-color .15s, box-shadow .15s;
}
.nbt-tool .nbt-textarea { min-height: 120px; resize: vertical; }
.nbt-tool .nbt-input:focus,
.nbt-tool .nbt-select:focus,
.nbt-tool .nbt-textarea:focus {
	border-color: var(--nbt-primary);
	box-shadow: 0 0 0 3px color-mix(in srgb, var(--nbt-primary) 18%, transparent);
}

.nbt-tool .nbt-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 6px;
	min-height: 42px;
	margin: 0;
	padding: 8px 18px;
	font: inherit;
	font-weight: 600;
	line-height: 1.2;
	color: #fff;
	background: var(--nbt-primary);
	border: 1px solid var(--nbt-primary);
	border-radius: calc(var(--nbt-radius) * .66);
	cursor: pointer;
	text-decoration: none;
	transition: filter .15s, transform .05s;
}
.nbt-tool .nbt-btn:hover { filter: brightness(1.08); color: #fff; }
.nbt-tool .nbt-btn:active { transform: translateY(1px); }
.nbt-tool .nbt-btn:disabled { opacity: .5; cursor: not-allowed; }
.nbt-tool .nbt-btn--ghost { color: var(--nbt-primary); background: transparent; }
.nbt-tool .nbt-btn--ghost:hover { color: var(--nbt-primary); background: color-mix(in srgb, var(--nbt-primary) 8%, transparent); }

.nbt-tool .nbt-result {
	margin-top: 16px;
	padding: 16px;
	background: color-mix(in srgb, var(--nbt-primary) 6%, var(--nbt-card));
	border: 1px solid color-mix(in srgb, var(--nbt-primary) 25%, var(--nbt-border));
	border-radius: var(--nbt-radius);
}
.nbt-tool .nbt-result:empty { display: none; }
.nbt-tool .nbt-note { font-size: .85em; color: color-mix(in srgb, var(--nbt-text) 60%, transparent); }

.nbt-tool .nbt-table { width: 100%; border-collapse: collapse; font-size: .92em; }
.nbt-tool .nbt-table th,
.nbt-tool .nbt-table td { padding: 8px 10px; border-bottom: 1px solid var(--nbt-border); text-align: left; }
.nbt-tool .nbt-table th { font-weight: 600; background: color-mix(in srgb, var(--nbt-primary) 5%, var(--nbt-card)); }

.nbt-tool .nbt-drop {
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 8px;
	min-height: 160px;
	padding: 24px;
	text-align: center;
	border: 2px dashed var(--nbt-border);
	border-radius: var(--nbt-radius);
	cursor: pointer;
	transition: border-color .15s, background .15s;
}
.nbt-tool .nbt-drop:hover,
.nbt-tool .nbt-drop.is-over {
	border-color: var(--nbt-primary);
	background: color-mix(in srgb, var(--nbt-primary) 5%, transparent);
}

/* Thông báo theo trạng thái */
.nbt-tool .nbt-alert { padding: 10px 14px; border-radius: calc(var(--nbt-radius) * .66); border: 1px solid; font-size: .92em; }
.nbt-tool .nbt-alert--success { color: var(--nbt-success); border-color: var(--nbt-success); background: color-mix(in srgb, var(--nbt-success) 8%, transparent); }
.nbt-tool .nbt-alert--warning { color: var(--nbt-warning); border-color: var(--nbt-warning); background: color-mix(in srgb, var(--nbt-warning) 8%, transparent); }
.nbt-tool .nbt-alert--danger { color: var(--nbt-danger); border-color: var(--nbt-danger); background: color-mix(in srgb, var(--nbt-danger) 8%, transparent); }

/* ===== Bố cục gọn ===== */
/* 2 cột: nhập | kết quả; tự xếp 1 cột khi khung hẹp. */
.nbt-tool .nbt-split { display: grid; gap: 16px 24px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); align-items: start; }
.nbt-tool .nbt-split > * { min-width: 0; display: flex; flex-direction: column; gap: 12px; }

/* Ô nhập có đơn vị bên trong */
.nbt-tool .nbt-input-wrap { position: relative; }
.nbt-tool .nbt-input-wrap .nbt-input { padding-right: 56px; }
.nbt-tool .nbt-suffix { position: absolute; right: 12px; top: 50%; transform: translateY(-50%); font-size: .85em; font-weight: 600; color: color-mix(in srgb, var(--nbt-text) 55%, transparent); pointer-events: none; }

/* Nhóm nút chọn (segmented) */
.nbt-tool .nbt-seg { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; background: color-mix(in srgb, var(--nbt-text) 5%, var(--nbt-card)); border-radius: calc(var(--nbt-radius) * .66); }
.nbt-tool .nbt-seg > button {
	flex: 1 1 0; min-width: 56px; min-height: 36px; margin: 0; padding: 6px 10px;
	font: inherit; font-size: .92em; font-weight: 600; color: var(--nbt-text);
	background: transparent; border: 0; border-radius: calc(var(--nbt-radius) * .5); cursor: pointer;
	transition: background .15s, color .15s, box-shadow .15s;
}
.nbt-tool .nbt-seg > button:hover { background: color-mix(in srgb, var(--nbt-primary) 8%, transparent); }
.nbt-tool .nbt-seg > button[aria-pressed="true"],
.nbt-tool .nbt-seg > button.is-active { color: #fff; background: var(--nbt-primary); box-shadow: 0 1px 3px color-mix(in srgb, var(--nbt-primary) 40%, transparent); }

/* Kết quả chính */
.nbt-tool .nbt-stat {
	display: flex; flex-direction: column; gap: 2px; padding: 16px 18px;
	background: color-mix(in srgb, var(--nbt-primary) 7%, var(--nbt-card));
	border: 1px solid color-mix(in srgb, var(--nbt-primary) 22%, var(--nbt-border));
	border-radius: var(--nbt-radius);
}
.nbt-tool .nbt-stat-label { font-size: .85em; color: color-mix(in srgb, var(--nbt-text) 65%, transparent); }
.nbt-tool .nbt-stat-value { font-size: 1.9em; line-height: 1.2; font-weight: 800; color: var(--nbt-primary); letter-spacing: -.01em; word-break: break-word; }
.nbt-tool .nbt-stat-sub { font-size: .8em; color: color-mix(in srgb, var(--nbt-text) 55%, transparent); }

/* Danh sách chỉ số phụ */
.nbt-tool .nbt-kv { display: flex; flex-direction: column; }
.nbt-tool .nbt-kv > div { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; padding: 8px 2px; border-bottom: 1px dashed var(--nbt-border); font-size: .92em; }
.nbt-tool .nbt-kv > div:last-child { border-bottom: 0; }
.nbt-tool .nbt-kv span { color: color-mix(in srgb, var(--nbt-text) 65%, transparent); }
.nbt-tool .nbt-kv b { font-weight: 700; text-align: right; }

/* Khối thu gọn */
.nbt-tool .nbt-details { border: 1px solid var(--nbt-border); border-radius: calc(var(--nbt-radius) * .66); padding: 0 12px; font-size: .9em; }
.nbt-tool .nbt-details > summary { cursor: pointer; padding: 10px 0; font-weight: 600; color: var(--nbt-primary); list-style-position: inside; }
.nbt-tool .nbt-details[open] > summary { border-bottom: 1px solid var(--nbt-border); margin-bottom: 8px; }
.nbt-tool .nbt-details > :not(summary) { margin: 0 0 10px; }

/* ===== Công cụ chuyên sâu ===== */
/* Thanh chuyển chế độ */
.nbt-tool .nbt-tabs { display: flex; flex-wrap: wrap; gap: 2px; border-bottom: 1px solid var(--nbt-border); margin-bottom: 4px; }
.nbt-tool .nbt-tabs > button {
	margin: 0 0 -1px; padding: 8px 14px; min-height: 38px;
	font: inherit; font-size: .92em; font-weight: 600; color: color-mix(in srgb, var(--nbt-text) 65%, transparent);
	background: transparent; border: 0; border-bottom: 2px solid transparent; border-radius: 0; cursor: pointer;
}
.nbt-tool .nbt-tabs > button:hover { color: var(--nbt-text); }
.nbt-tool .nbt-tabs > button[aria-selected="true"],
.nbt-tool .nbt-tabs > button.is-active { color: var(--nbt-primary); border-bottom-color: var(--nbt-primary); }

/* Bảng số: căn phải cột số, dòng tổng, dòng đang áp dụng */
.nbt-tool .nbt-table--num th:not(:first-child),
.nbt-tool .nbt-table--num td:not(:first-child) { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
.nbt-tool .nbt-table tfoot td,
.nbt-tool .nbt-table tfoot th { font-weight: 700; border-top: 2px solid var(--nbt-border); border-bottom: 0; }
.nbt-tool .nbt-table tr.is-active td { background: color-mix(in srgb, var(--nbt-primary) 8%, transparent); }
.nbt-tool .nbt-details { overflow-x: auto; }
.nbt-tool .nbt-details .nbt-table { font-size: 1em; }

/* Thanh cơ cấu */
.nbt-tool .nbt-bar { display: flex; height: 10px; overflow: hidden; border-radius: 99px; background: color-mix(in srgb, var(--nbt-text) 8%, transparent); }
.nbt-tool .nbt-bar > span { flex: 0 0 auto; min-width: 2px; background: var(--nbt-primary); }
.nbt-tool .nbt-bar > span:nth-child(2) { background: color-mix(in srgb, var(--nbt-primary) 50%, var(--nbt-card)); }
.nbt-tool .nbt-bar > span:nth-child(3) { background: var(--nbt-warning, #d97706); }
.nbt-tool .nbt-bar > span:nth-child(4) { background: var(--nbt-danger, #dc2626); }

/* Dòng nguồn cuối công cụ */
.nbt-tool .nbt-source { margin: 4px 0 0; padding-top: 10px; border-top: 1px solid var(--nbt-border); font-size: .78em; color: color-mix(in srgb, var(--nbt-text) 55%, transparent); }