:root {
  color-scheme: light;
  --bg: #f6f4ef; --card: #ffffff; --text: #1d1b16; --text-2: #52514e; --muted: #6b665a; --line: #e6e1d6;
  --gold: #8a6508; --gold-soft: #fbf3df; --up: #0f7a41; --down: #c62828; --up-soft: #e2f3e8; --down-soft: #fbe6e6; --on-strong: #ffffff;
  --grid: #ebe8e1; --axis: #c3c2b7; --series-1: #2a78d6; --series-2: #eb6834;
}
@media (prefers-color-scheme: dark) {
  :root:where(:not([data-theme="light"])) {
    color-scheme: dark;
    --bg: #14130f; --card: #1e1c17; --text: #f1ede3; --text-2: #c3c2b7; --muted: #a39d8e; --line: #34312a;
    --gold: #e0b44c; --gold-soft: #2a2416; --up: #4cc68a; --down: #ef6b6b; --up-soft: #1b3125; --down-soft: #3a2020; --on-strong: #14130f;
    --grid: #2c2a25; --axis: #4a4740; --series-1: #3987e5; --series-2: #d95926;
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14130f; --card: #1e1c17; --text: #f1ede3; --text-2: #c3c2b7; --muted: #a39d8e; --line: #34312a;
  --gold: #e0b44c; --gold-soft: #2a2416; --up: #4cc68a; --down: #ef6b6b; --up-soft: #1b3125; --down-soft: #3a2020; --on-strong: #14130f;
  --grid: #2c2a25; --axis: #4a4740; --series-1: #3987e5; --series-2: #d95926;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
a { color: var(--gold); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
main.wrap { padding-top: 20px; padding-bottom: 40px; }
h1 { margin: 4px 0 2px; font-size: 28px; line-height: 1.25; }
h2 { font-size: 17px; margin: 0 0 10px; }
h3 { font-size: 15px; margin: 14px 0 4px; }

.site-header { background: var(--card); border-bottom: 1px solid var(--line); }
.site-header .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 20px; padding-top: 12px; padding-bottom: 12px; }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 800; font-size: 21px; letter-spacing: -.3px;
         color: var(--text); text-decoration: none; }
.brand img { display: block; width: 34px; height: 34px; }
.brand span { color: var(--gold); }
.nav { display: flex; flex-wrap: wrap; gap: 4px 16px; }
.nav a { text-decoration: none; font-size: 14px; }
.crumbs { font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }

.meta { color: var(--muted); font-size: 13px; margin: 0 0 8px; }
.lead { margin: 8px 0 16px; max-width: 78ch; }
.note, .empty { color: var(--muted); }
.empty { padding: 8px 0; }

.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin: 16px 0; }
.tile { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; }
.tile .lbl { color: var(--muted); font-size: 13px; }
.tile .val { font-size: 24px; font-weight: 700; }
.tile .sub { font-size: 13px; color: var(--muted); }
.tile .val small.unit { font-size: 13px; font-weight: 500; color: var(--muted); }
.tiles-note { display: none; margin: 0 0 12px; font-size: 12px; color: var(--muted); }
p.unit { margin: 0; padding: 8px 16px 0; font-size: 12px; color: var(--muted); }
.legend li.unit { margin-left: auto; color: var(--muted); }

.toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0 12px; }
.toolbar input { flex: 1; min-width: 180px; padding: 8px 12px; border-radius: 8px; border: 1px solid var(--line);
                 background: var(--card); color: var(--text); font: inherit; }
.chip { background: var(--card); color: var(--text); border: 1px solid var(--line); border-radius: 8px;
        padding: 8px 14px; font: inherit; cursor: pointer; }
.chip.on { background: var(--gold-soft); border-color: var(--gold); color: var(--gold); font-weight: 600; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; margin-bottom: 16px; padding: 14px 16px; }
.card.company { padding: 0; overflow: hidden; }
.card.company h2 { margin: 0; padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--gold-soft);
                   display: flex; flex-wrap: wrap; gap: 4px 10px; align-items: baseline; }
.card.company h2 a { color: var(--text); }
.card.company h2 small { font-weight: 400; color: var(--muted); font-size: 12px; }
.card.company .empty { padding: 12px 16px; }
.prose p { max-width: 78ch; }
.links ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }

.scroll { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th, td { padding: 9px 16px; text-align: right; border-bottom: 1px solid var(--line); white-space: nowrap; }
th:first-child, td:first-child { text-align: left; white-space: normal; }
.c-name { min-width: 9em; }
td.c-name small { display: block; color: var(--muted); font-size: 12px; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
.up { color: var(--up); } .down { color: var(--down); }
/* Mức tăng/giảm: nền nhạt = ít, nền đậm = mạnh (từ 1%) */
.chg { display: inline-block; padding: 1px 6px; border-radius: 6px; white-space: nowrap; font-variant-numeric: tabular-nums; }
.chg.up { background: var(--up-soft); } .chg.down { background: var(--down-soft); }
.chg.strong { font-weight: 700; color: var(--on-strong); }
.chg.up.strong { background: var(--up); } .chg.down.strong { background: var(--down); }

/* Biểu đồ */
.chart { margin: 0; outline: none; }
.chart:focus-visible { box-shadow: 0 0 0 2px var(--gold); border-radius: 8px; }
.legend { list-style: none; padding: 0; margin: 0 0 6px; display: flex; flex-wrap: wrap; gap: 4px 16px; font-size: 13px; color: var(--text-2); }
.legend li { display: flex; align-items: center; gap: 6px; }
.sw { display: inline-block; width: 12px; height: 3px; border-radius: 2px; background: var(--c); }
.s1 { --c: var(--series-1); } .s2 { --c: var(--series-2); }
.chart-box { position: relative; overflow-x: auto; }
.chart svg { display: block; width: 100%; min-width: 600px; height: auto; }
.chart .grid line { stroke: var(--grid); stroke-width: 1; }
.chart .tick { fill: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.chart .series { fill: none; stroke: var(--c); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart .dot { fill: var(--c); stroke: var(--card); stroke-width: 2; }
.chart .end-label { fill: var(--text-2); font-size: 12px; font-variant-numeric: tabular-nums; }
.chart .crosshair { stroke: var(--axis); stroke-width: 1; }
.tooltip { position: absolute; top: 4px; pointer-events: none; background: var(--card); color: var(--text); border: 1px solid var(--line);
           border-radius: 8px; padding: 6px 10px; font-size: 13px; box-shadow: 0 4px 14px rgba(0,0,0,.12); white-space: nowrap; }
.tooltip .row { display: flex; align-items: center; gap: 6px; }
.chart details { margin-top: 8px; font-size: 13px; }
.chart summary { cursor: pointer; color: var(--muted); }

/* Form liên hệ */
.contact-form { display: grid; gap: 12px; max-width: 560px; margin: 16px 0; }
.contact-form label { display: grid; gap: 4px; font-size: 14px; color: var(--text-2); }
.contact-form input, .contact-form textarea { font: inherit; padding: 9px 12px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text); }
.contact-form button { justify-self: start; font: inherit; font-weight: 600; padding: 9px 20px; border-radius: 8px;
  border: 0; background: var(--gold); color: #fff; cursor: pointer; }
.contact-form button:disabled { opacity: .6; cursor: wait; }
.contact-form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-status { margin: 0; font-size: 14px; }
.form-status.ok { color: var(--up); } .form-status.err { color: var(--down); }

.site-footer { border-top: 1px solid var(--line); background: var(--card); color: var(--muted); font-size: 13px; }
.site-footer .wrap { padding-top: 16px; padding-bottom: 24px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-bottom: 8px; }

@media (max-width: 600px) {
  h1 { font-size: 23px; }
  th, td { padding: 8px 8px; }
  .c-spread { display: none; }
  .c-name { min-width: 8em; }
  .lead { font-size: 14px; color: var(--text-2); }
  /* Ô giá: lưới 2 cột gọn */
  .tiles { grid-template-columns: 1fr 1fr; gap: 8px; margin: 12px 0 4px; }
  .tile { padding: 10px 12px; border-radius: 10px; }
  .tile .lbl, .tile .sub { font-size: 12px; }
  .tile .val { font-size: 20px; line-height: 1.3; }
  .tile .unit.vnd, .tile .long { display: none; }
  .tiles-note { display: block; }
}