/* ==========================================================================
   AmmonitChart — khung biểu đồ chuỗi thời gian (web/js/chart.js)
   Dùng CSS vars chung từ web/css/styles.css; có giá trị dự phòng khi thiếu.
   Khung sáng, sạch, kiểu dashboard kỹ thuật.
   ========================================================================== */

.amc {
  --amc-bg: var(--panel, #ffffff);
  --amc-line: var(--line, #dbe3ec);
  --amc-text: var(--text, #12202e);
  --amc-muted: var(--muted, #6b7b8c);
  --amc-accent: var(--accent, #2f7ef6);
  --amc-warn: var(--warn, #b45309);
  --amc-radius: var(--radius, 8px);
  --amc-font: var(--font, "Segoe UI", "Roboto", "Helvetica Neue", system-ui, -apple-system, Arial, sans-serif);

  position: relative;
  width: 100%;
  box-sizing: border-box;
  font-family: var(--amc-font);
  color: var(--amc-text);
  background: var(--amc-bg);
  border-radius: var(--amc-radius);
  overflow: hidden;
  /* Không chặn thao tác chạm cuộn trang nhưng vẫn nhận pointer cho crosshair */
  touch-action: pan-y;
  user-select: none;
  -webkit-user-select: none;
}

.amc:focus-within {
  box-shadow: 0 0 0 2px color-mix(in srgb, var(--amc-accent) 35%, transparent);
}

/* Thuộc tính hidden luôn thắng mọi display khác (kể cả inline) */
.amc [hidden] {
  display: none !important;
}

/* --- Canvas --- */
.amc__canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
}

.amc__canvas:focus-visible {
  outline: 2px solid var(--amc-accent);
  outline-offset: -2px;
  border-radius: var(--amc-radius);
}

/* --- Tiêu đề góc trên trái --- */
.amc__title {
  position: absolute;
  left: 12px;
  top: 8px;
  z-index: 2;
  pointer-events: none;
  font: 600 13px/1.2 var(--amc-font);
  color: var(--amc-text);
  max-width: calc(100% - 190px);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* --- Lớp phủ trong suốt --- */
.amc__overlay {
  position: absolute;
  inset: 0;
  z-index: 3;
  pointer-events: none;
}

/* --- Tooltip crosshair --- */
.amc__tooltip {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 7;
  pointer-events: none;
  display: none;
  max-width: min(240px, calc(100% - 12px));
  padding: 6px 9px;
  border-radius: calc(var(--amc-radius) * 0.75);
  background: rgba(18, 32, 46, 0.92);
  color: #fff;
  font: 12px/1.35 var(--amc-font);
  white-space: nowrap;
  box-shadow: 0 4px 14px rgba(15, 32, 52, 0.18);
  transition: opacity 120ms ease;
}

.amc__tooltip[hidden] { display: none !important; }

.amc__tooltip-val {
  display: block;
  margin-top: 2px;
  font-weight: 600;
  color: #fff;
}

/* --- Banner "DỮ LIỆU MÔ PHỎNG" (góc trên phải, màu cảnh báo) --- */
.amc__demo-badge {
  position: absolute;
  top: 8px;
  right: 10px;
  z-index: 5;
  pointer-events: none;
  font: 600 10px/1 var(--amc-font);
  letter-spacing: 0.06em;
  padding: 4px 7px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--amc-warn) 10%, transparent);
  color: var(--amc-warn);
  border: 1px solid color-mix(in srgb, var(--amc-warn) 35%, transparent);
  white-space: nowrap;
}

.amc__demo-badge[hidden] { display: none !important; }

/* --- Skeleton shimmer khi tải --- */
.amc__skeleton {
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  /* Khối sáng chạy ngang rất nhẹ trên nền xám mờ — đủ gợi ý "đang tải", không gây nháy */
  background-color: color-mix(in srgb, var(--amc-line) 22%, transparent);
  background-image: linear-gradient(
    100deg,
    transparent 20%,
    color-mix(in srgb, var(--panel) 65%, transparent) 45%,
    color-mix(in srgb, var(--panel) 80%, transparent) 52%,
    transparent 75%
  );
  background-size: 260% 100%;
  background-repeat: no-repeat;
  background-position: 120% 0;
  animation: amc-shimmer 1.6s ease-in-out infinite;
}

/* Vạch dọc giả lập lưới cho skeleton */
.amc__skeleton::before {
  content: "";
  position: absolute;
  left: 48px;
  right: 22px;
  top: 26px;
  bottom: 26px;
  border-left: 1px solid color-mix(in srgb, var(--amc-line) 80%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--amc-line) 80%, transparent);
  border-radius: 2px;
  opacity: 0.9;
}

/* Vài vạch ngang gợi ý lưới */
.amc__skeleton::after {
  content: "";
  position: absolute;
  left: 48px;
  right: 22px;
  top: 26px;
  bottom: 26px;
  background-image: linear-gradient(
    to bottom,
    color-mix(in srgb, var(--amc-line) 70%, transparent) 1px,
    transparent 1px
  );
  background-size: 100% 25%;
  opacity: 0.75;
}

.amc__skeleton[hidden] { display: none !important; }

@keyframes amc-shimmer {
  0%   { background-position: 120% 0; }
  100% { background-position: -40% 0; }
}

/* --- Trạng thái rỗng --- */
.amc__empty {
  position: absolute;
  inset: 0;
  z-index: 4;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px;
  font: 13px/1.4 var(--amc-font);
  color: var(--amc-muted);
  pointer-events: none;
  text-align: center;
}

.amc__empty[hidden] { display: none !important; }

/* --- Trạng thái lỗi --- */
.amc__error {
  position: absolute;
  inset: 0;
  z-index: 6;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px;
  font: 13px/1.4 var(--amc-font);
  color: var(--amc-text);
  text-align: center;
  background: color-mix(in srgb, var(--amc-bg) 88%, transparent);
}

.amc__error[hidden] { display: none !important; }

.amc__error-msg {
  max-width: 46ch;
  color: var(--amc-warn);
}

.amc__retry {
  pointer-events: auto;
  font: 600 12px/1 var(--amc-font);
  padding: 6px 12px;
  border-radius: calc(var(--amc-radius) * 0.75);
  border: 1px solid var(--amc-line);
  background: var(--amc-bg);
  color: var(--amc-accent);
  cursor: pointer;
}

.amc__retry:hover {
  border-color: var(--amc-accent);
}

.amc__retry:focus-visible {
  outline: 2px solid var(--amc-accent);
  outline-offset: 2px;
}

/* --- Vùng đọc cho screen reader --- */
.amc__live {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* --- Sparkline trong danh sách sensor (canvas do drawSparkline vẽ) --- */
.amc-spark {
  display: block;
  pointer-events: none;
}

/* --- Khung thẻ chứa biểu đồ (tuỳ chọn, dùng cạnh khung lưới dashboard) --- */
.amc-card {
  padding: 12px 12px 8px;
  background: var(--panel, #ffffff);
  border: 1px solid var(--line, #dbe3ec);
  border-radius: var(--radius, 8px);
}

.amc-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 6px;
  font: 12px/1.3 var(--font, "Segoe UI", Roboto, system-ui, sans-serif);
  color: var(--muted, #6b7b8c);
}

@media (prefers-reduced-motion: reduce) {
  .amc__skeleton {
    animation: none;
    background-position: 0 0;
  }
}

/* Badge "SỐ LIỆU CŨ" — do trang quan trắc bổ sung (dùng chung tông với banner mô phỏng) */
.amc__stale-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 999px;
  font: 700 10px/1.6 var(--font, system-ui, sans-serif);
  letter-spacing: .04em;
  color: #b45309;
  background: #fffbeb;
  border: 1px solid #fde68a;
  white-space: nowrap;
}