/* ATK — house style. Một file dùng chung cho cả 3 trang.
   Nguyên tắc thiết kế: ít màu, nhiều khoảng thở, chữ số kể chuyện.
   Màu tín hiệu (amber) chỉ dùng cho THỨ ĐO ĐƯỢC — không dùng để trang trí. */

/* ── Chữ tự host: ⛔0 gọi Google, ⛔0 phụ thuộc mạng ngoài, ⛔0 rò người đọc.
   Inter variable 400–700 (đủ cả bộ TIẾNG VIỆT — trang có "Xuân Đỉnh") + JetBrains Mono cho số đo. */
@font-face { font-family: Inter; font-style: normal; font-weight: 400 700; font-display: swap;
  src: url(/fonts/inter-vietnamese.woff2) format('woff2');
  unicode-range: U+0102-0103,U+0110-0111,U+0128-0129,U+0168-0169,U+01A0-01A1,U+01AF-01B0,U+0300-0301,U+0303-0304,U+0308-0309,U+0323,U+0329,U+1EA0-1EF9,U+20AB; }
@font-face { font-family: Inter; font-style: normal; font-weight: 400 700; font-display: swap;
  src: url(/fonts/inter-latin-ext.woff2) format('woff2');
  unicode-range: U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF; }
@font-face { font-family: Inter; font-style: normal; font-weight: 400 700; font-display: swap;
  src: url(/fonts/inter-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }
@font-face { font-family: 'JetBrains Mono'; font-style: normal; font-weight: 400 500; font-display: swap;
  src: url(/fonts/jbmono-latin.woff2) format('woff2');
  unicode-range: U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD; }

:root {
  --bg: #08090b;
  --bg-lift: #0e1013;
  --line: #1c1f25;
  --line-soft: #14171c;
  --ink: #e9eaee;
  --ink-dim: #9aa0ab;
  --ink-faint: #6b7280;
  --signal: #d9a441;
  --signal-dim: #8a6a2c;

  --font: Inter, ui-sans-serif, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --pad: clamp(1.25rem, 5vw, 3rem);
  --section: clamp(5rem, 11vw, 9.5rem);
  --max: 1120px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Vệt sáng rất mờ sau hero — tạo chiều sâu mà không dùng ảnh */
body::before {
  content: "";
  position: fixed;
  inset: -30vh 0 auto 0;
  height: 90vh;
  background: radial-gradient(60% 50% at 50% 0%, rgba(217, 164, 65, .07), transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding-inline: var(--pad); position: relative; z-index: 1; }

a { color: inherit; text-decoration: none; }

/* ---------- chữ ---------- */
h1, h2, h3 { margin: 0; font-weight: 560; letter-spacing: -0.033em; line-height: 1.06; }
h1 { font-size: clamp(2.4rem, 6.4vw, 4.4rem); }
h2 { font-size: clamp(1.75rem, 3.9vw, 2.7rem); letter-spacing: -0.03em; }
h3 { font-size: 1.16rem; letter-spacing: -0.02em; line-height: 1.35; }
p { margin: 0; }

.lede { font-size: clamp(1.06rem, 1.9vw, 1.3rem); color: var(--ink-dim); line-height: 1.6; max-width: 60ch; }
.muted { color: var(--ink-dim); }
.faint { color: var(--ink-faint); }
.sig { color: var(--signal); }

.label {
  font-family: var(--mono);
  font-size: .69rem;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 500;
}

/* ---------- thanh điều hướng ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(160%) blur(14px);
  background: rgba(8, 9, 11, .72);
  border-bottom: 1px solid var(--line-soft);
}
.nav-in { display: flex; align-items: center; gap: 2rem; height: 66px; }
.brand { display: inline-flex; align-items: center; gap: .6rem; margin-right: auto; }
.brand svg { width: 22px; height: 22px; color: var(--ink); display: block; }
.brand b { font-weight: 570; letter-spacing: .015em; font-size: 1.02rem; }
.brand .sub { color: var(--ink-faint); font-size: .78rem; letter-spacing: .05em; padding-left: .55rem; border-left: 1px solid var(--line); }
.nav-links { display: flex; gap: 1.9rem; align-items: center; }
.nav-links a { font-size: .92rem; color: var(--ink-dim); transition: color .18s ease; }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav-links { display: none; } .brand .sub { display: none; } }

/* ---------- nút ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .55rem;
  padding: .72rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-size: .94rem; font-weight: 500;
  color: var(--ink);
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
  white-space: nowrap;
}
.btn:hover { border-color: #33383f; background: var(--bg-lift); }
.btn-primary { background: var(--signal); border-color: var(--signal); color: #17130a; font-weight: 560; }
.btn-primary:hover { background: #e7b45a; border-color: #e7b45a; }
.btn .arw { transition: transform .2s ease; }
.btn:hover .arw { transform: translateX(3px); }

/* ---------- bố cục ---------- */
section { padding-block: var(--section); position: relative; z-index: 1; }
.rule { border: 0; border-top: 1px solid var(--line-soft); margin: 0; }

.hero { padding-top: clamp(4.5rem, 10vw, 8rem); padding-bottom: clamp(3.5rem, 7vw, 6rem); }
.hero h1 { max-width: 17ch; }
.hero-grid h1 { font-size: clamp(2.3rem, 4.6vw, 3.65rem); }
.hero .lede { margin-top: 1.7rem; }
.hero-cta { margin-top: 2.6rem; display: flex; gap: .8rem; flex-wrap: wrap; }

/* dải số đo */
.metrics { display: grid; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); border-top: 1px solid var(--line); }
.metric { padding: 2rem 1.6rem 2rem 0; border-right: 1px solid var(--line-soft); }
.metric:last-child { border-right: 0; }
.metric .n { font-family: var(--mono); font-size: clamp(1.7rem, 3.1vw, 2.15rem); color: var(--signal); letter-spacing: -.02em; line-height: 1; }
.metric .t { margin-top: .85rem; font-size: .9rem; color: var(--ink-dim); line-height: 1.5; max-width: 30ch; }
@media (max-width: 640px) { .metric { border-right: 0; border-bottom: 1px solid var(--line-soft); padding-right: 0; } }

/* lưới 2 cột: tiêu đề trái, nội dung phải */
.split { display: grid; grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr); gap: clamp(2rem, 6vw, 5rem); align-items: start; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: 2.2rem; } }

/* thẻ sản phẩm */
.cards { display: grid; gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); margin-top: 3rem; }
@media (min-width: 900px) { .cards { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--bg); padding: 2.1rem 1.9rem 1.9rem; display: flex; flex-direction: column; gap: .9rem; transition: background .25s ease; }
.card:hover { background: var(--bg-lift); }
.card .top { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; }
.card .status { font-family: var(--mono); font-size: .64rem; letter-spacing: .13em; text-transform: uppercase; color: var(--ink-faint); border: 1px solid var(--line); padding: .2rem .45rem; border-radius: 2px; white-space: nowrap; }
.card p { font-size: .95rem; color: var(--ink-dim); line-height: 1.6; }
.card .proof { font-family: var(--mono); font-size: .82rem; color: var(--signal); border-top: 1px solid var(--line-soft); padding-top: .95rem; margin-top: auto; }
.card .go { font-size: .9rem; color: var(--ink); display: inline-flex; align-items: center; gap: .4rem; }
.card:hover .go .arw { transform: translateX(3px); }

/* danh sách có gạch */
.rows { border-top: 1px solid var(--line-soft); }
.row { display: grid; grid-template-columns: minmax(0, .42fr) minmax(0, 1fr); gap: clamp(1rem, 4vw, 3rem); padding: 1.8rem 0; border-bottom: 1px solid var(--line-soft); }
.row h3 { padding-top: .1rem; }
.row p { color: var(--ink-dim); font-size: .97rem; }
@media (max-width: 720px) { .row { grid-template-columns: 1fr; gap: .6rem; } }

/* khối trích/nguyên tắc */
.stmt { border-left: 2px solid var(--signal-dim); padding-left: clamp(1.2rem, 3vw, 2rem); }
.stmt p { font-size: clamp(1.15rem, 2.3vw, 1.5rem); line-height: 1.45; letter-spacing: -.02em; color: var(--ink); max-width: 46ch; }

/* ghi chú trung thực */
.note { border: 1px solid var(--line); border-radius: 2px; padding: 1.3rem 1.5rem; background: var(--bg-lift); }
.note p { font-size: .92rem; color: var(--ink-dim); line-height: 1.62; }
.note .label { display: block; margin-bottom: .6rem; }

/* chân trang */
footer { border-top: 1px solid var(--line-soft); padding-block: 3.4rem 4rem; }
.foot { display: flex; gap: 2.5rem 3rem; flex-wrap: wrap; justify-content: space-between; }
.foot .col { display: flex; flex-direction: column; gap: .55rem; font-size: .88rem; color: var(--ink-dim); }
.foot a:hover { color: var(--ink); }
.legal { margin-top: 2.8rem; padding-top: 1.6rem; border-top: 1px solid var(--line-soft); font-size: .8rem; color: var(--ink-faint); line-height: 1.7; }

/* hiện dần khi cuộn tới */
.rise { opacity: 0; transform: translateY(14px); transition: opacity .7s cubic-bezier(.2,.7,.3,1), transform .7s cubic-bezier(.2,.7,.3,1); }
.rise.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .rise { opacity: 1; transform: none; transition: none; } }

::selection { background: rgba(217,164,65,.26); }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

/* ═══════════════════════════════════════════════════════════════════════════
   LỚP CHIỀU SÂU + THIẾT BỊ ĐO Ở HERO  (thêm 2/8 — Dong: "chưa thấy wow")
   Nguyên tắc giữ nguyên: ⛔0 hiệu ứng trang trí. Thứ chuyển động trên trang
   phải LÀ chính con số ta bán — 24 kỹ thuật replay, 3 kêu, 21 im.
   ═══════════════════════════════════════════════════════════════════════ */

/* lưới nền rất mờ — cảm giác giấy kỹ thuật, ⛔0 phải hoạ tiết */
body::after {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,.022) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,.022) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 20%, transparent 78%);
}

/* hero 2 cột khi đủ rộng */
.hero-grid { display: grid; grid-template-columns: minmax(0,1.02fr) minmax(0,.98fr); gap: clamp(2rem,5vw,4.5rem); align-items: center; }
@media (max-width: 980px) { .hero-grid { grid-template-columns: 1fr; gap: 3rem; } }

/* ── THIẾT BỊ ĐO ── */
.rig {
  border: 1px solid var(--line); border-radius: 3px; background:
    linear-gradient(180deg, rgba(255,255,255,.028), rgba(255,255,255,0) 42%), #0b0d10;
  padding: 1.15rem 1.15rem 1rem; box-shadow: 0 30px 70px -30px rgba(0,0,0,.9);
}
.rig-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding-bottom: .9rem; border-bottom: 1px solid var(--line-soft); }
.rig-head .label { font-size: .62rem; }
.rig-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--signal); box-shadow: 0 0 0 0 rgba(217,164,65,.55); animation: pulse 2.4s ease-out infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(217,164,65,.5) } 70% { box-shadow: 0 0 0 7px rgba(217,164,65,0) } 100% { box-shadow: 0 0 0 0 rgba(217,164,65,0) } }

.cells { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; padding: 1.1rem 0 .9rem; }
.cell {
  position: relative; aspect-ratio: 1 / .74; border: 1px solid #191d23; border-radius: 2px;
  background: #0c0e11; overflow: hidden;
  transition: background .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.cell::after {
  content: ""; position: absolute; inset: 0; background: var(--signal); opacity: 0;
  transition: opacity .3s ease;
}
.cell.scan { border-color: #2e343d; background: #12151a; }
.cell.hit { border-color: var(--signal); background: rgba(217,164,65,.14); box-shadow: 0 0 22px -6px rgba(217,164,65,.55); }
.cell.hit::after { opacity: .1; }
.cell.miss { border-color: #171b20; background: #0a0c0f; }
.cell .t {
  position: absolute; inset: 0; display: grid; place-items: center;
  font-family: var(--mono); font-size: .58rem; color: var(--signal); opacity: 0;
  transition: opacity .35s ease .1s;
}
.cell.hit .t { opacity: 1; }
.cell .x { position: absolute; inset: 0; display: grid; place-items: center; font-family: var(--mono); font-size: .6rem; color: #2b3038; opacity: 0; transition: opacity .5s ease; }
.cell.miss .x { opacity: 1; }

.rig-foot { display: flex; gap: 1.4rem; flex-wrap: wrap; padding-top: .9rem; border-top: 1px solid var(--line-soft); font-family: var(--mono); font-size: .68rem; letter-spacing: .04em; }
.rig-foot span { color: var(--ink-faint); }
.rig-foot b { font-weight: 500; color: var(--ink-dim); }
.rig-foot .on { color: var(--signal); }

/* ── lưới năng lực kỹ thuật (Why ATK) ── */
.caps { display: grid; gap: 1px; background: var(--line-soft); border: 1px solid var(--line-soft); }
@media (min-width: 700px) { .caps { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1000px) { .caps { grid-template-columns: repeat(3, 1fr); } }
.cap { background: var(--bg); padding: 1.7rem 1.6rem; display: flex; flex-direction: column; gap: .7rem; transition: background .25s ease; }
.cap:hover { background: var(--bg-lift); }
.cap .k { font-family: var(--mono); font-size: .63rem; letter-spacing: .14em; text-transform: uppercase; color: var(--signal-dim); }
.cap h3 { font-size: 1.03rem; }
.cap p { font-size: .92rem; color: var(--ink-dim); line-height: 1.6; }
.cap .n { font-family: var(--mono); font-size: .82rem; color: var(--signal); padding-top: .2rem; }

/* số đếm lên */
.metric .n[data-to] { font-variant-numeric: tabular-nums; }

/* ── đồng hồ 3 SIEM (trang VCT) — số THẬT đã đo: T1110.001 ── */
.bars { display: flex; flex-direction: column; gap: .95rem; padding: 1.2rem 0 1rem; }
.bar { display: grid; grid-template-columns: 5.6rem 1fr 4.6rem; gap: .9rem; align-items: center; }
.bar .nm { font-family: var(--mono); font-size: .72rem; color: var(--ink-dim); letter-spacing: .04em; }
.bar .tr { display: block; height: 7px; background: #101317; border: 1px solid #191d23; border-radius: 999px; overflow: hidden; }
.bar .fl { display: block; height: 100%; width: 0; border-radius: 999px;
  background: linear-gradient(90deg, rgba(217,164,65,.35), var(--signal));
  transition: width 1.15s cubic-bezier(.22,.75,.25,1); }
.bar .vl { font-family: var(--mono); font-size: .74rem; color: var(--signal); text-align: right; }
@media (prefers-reduced-motion: reduce) { .bar .fl { transition: none; } }

/* ── công thức HNDL (trang VPQ) — ⛛ ⛔0 phải số đo giả, đây là CÁCH ta chấm ── */
.fx { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; padding: 1.25rem 0 .5rem; }
.fx .f { border: 1px solid #191d23; border-radius: 2px; background: #0c0e11; padding: .8rem .6rem; text-align: center; }
.fx .f .g { font-family: var(--mono); font-size: 1.35rem; color: var(--signal); line-height: 1; }
.fx .f .l { margin-top: .55rem; font-size: .68rem; color: var(--ink-faint); letter-spacing: .02em; line-height: 1.35; }
.fx-eq { display: flex; align-items: baseline; gap: .6rem; padding: .9rem 0 .2rem; font-family: var(--mono); font-size: .78rem; color: var(--ink-dim); flex-wrap: wrap; }
.fx-eq b { color: var(--signal); font-weight: 500; }

/* ── form liên hệ ── */
.form { display: grid; gap: .85rem; width: 100%; max-width: 560px; text-align: left; }
.form .two { display: grid; gap: .85rem; grid-template-columns: 1fr 1fr; }
@media (max-width: 560px) { .form .two { grid-template-columns: 1fr; } }
.form label { display: block; font-family: var(--mono); font-size: .63rem; letter-spacing: .14em;
  text-transform: uppercase; color: var(--ink-faint); margin-bottom: .4rem; }
.form input, .form textarea {
  width: 100%; background: #0b0d10; border: 1px solid var(--line); border-radius: 2px;
  color: var(--ink); font: inherit; font-size: .95rem; padding: .68rem .8rem;
  transition: border-color .18s ease, background .18s ease;
}
.form textarea { min-height: 118px; resize: vertical; line-height: 1.55; }
.form input:focus, .form textarea:focus { outline: none; border-color: var(--signal-dim); background: #0e1116; }
.form input::placeholder, .form textarea::placeholder { color: #4b515b; }
.form .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.form-row { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; margin-top: .3rem; }
.form-msg { font-size: .88rem; color: var(--ink-dim); min-height: 1.3em; }
.form-msg.ok { color: var(--signal); }
.form-msg.err { color: #e07a63; }
.form button[disabled] { opacity: .55; cursor: default; }
.chan { display: flex; gap: 1.6rem; flex-wrap: wrap; justify-content: center; font-size: .92rem; }
.chan a { color: var(--ink-dim); border-bottom: 1px solid transparent; transition: color .18s, border-color .18s; }
.chan a:hover { color: var(--ink); border-color: var(--signal-dim); }