/* Trang tải «Kẻ Giúp Việc Điên Rồ – ZeusVN Brain» — cùng bộ nhận diện zeusvn.com (nền chàm đêm, vàng đồng → đỏ son, Be Vietnam Pro).
   Tối mặc định, sáng theo máy (prefers-color-scheme). Không style nội tuyến. Nhóm ngắn (thẻ hệ điều hành, các bước) xếp NGANG, tự xuống hàng trên điện thoại. */
:root {
  --bg: #05070e; --bg2: #0a1020; --card: #0e1528; --card2: #131c33; --line: rgba(150, 170, 255, .14); --line2: rgba(232, 176, 79, .42);
  --tx: #eef1ff; --mut: #a3acd0; --dong: #e8b04f; --dong2: #ffd98a; --son: #ff6a45; --ok: #58d68d;
  --grad: linear-gradient(110deg, #ffe3a0 0%, #e8b04f 38%, #ff6a45 100%);
  --btn: linear-gradient(135deg, #f7a928 0%, #ff7417 100%); --on-btn: #1a0d00;
  --glow: radial-gradient(60% 50% at 75% 0%, rgba(232, 176, 79, .16), transparent 70%), radial-gradient(50% 40% at 0% 10%, rgba(91, 120, 255, .14), transparent 70%);
  --shadow: 0 1px 0 rgba(255, 255, 255, .03) inset, 0 18px 40px -24px rgba(0, 0, 0, .7);
  --sans: 'Be Vietnam Pro', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif; --mono: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
  --r: 18px; --wrap: 1120px;
  color-scheme: dark;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f7f4ee; --bg2: #efe9dd; --card: #ffffff; --card2: #faf6ee; --line: #e3dccd; --line2: #d9a84a;
    --tx: #1d1a14; --mut: #5d5546; --dong: #9a5f00; --dong2: #b36b00; --son: #c2410c; --ok: #13804f;
    --grad: linear-gradient(110deg, #c27a00 0%, #b35a00 50%, #c2410c 100%);
    --glow: radial-gradient(60% 50% at 75% 0%, rgba(232, 176, 79, .22), transparent 70%), radial-gradient(50% 40% at 0% 10%, rgba(91, 120, 255, .08), transparent 70%);
    --shadow: 0 1px 2px rgba(20, 16, 8, .06), 0 12px 28px -18px rgba(20, 16, 8, .25);
    color-scheme: light;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html, body { overflow-x: clip; }
body { margin: 0; background: var(--glow), var(--bg); background-repeat: no-repeat; color: var(--tx); font: 400 16px/1.6 var(--sans); }
img, svg { display: block; max-width: 100%; }
a { color: var(--dong2); text-underline-offset: 3px; }
a:hover { color: var(--son); }
:focus-visible { outline: 2px solid var(--dong); outline-offset: 3px; border-radius: 8px; }
code, pre { font-family: var(--mono); font-size: .86em; }
code { padding: 1px 6px; border-radius: 6px; background: var(--card2); border: 1px solid var(--line); overflow-wrap: anywhere; }
.sr-only { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.wrap { width: min(var(--wrap), calc(100% - 32px)); margin-inline: auto; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* đầu trang */
.top { border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 82%, transparent); }
.top-in { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 64px; }
.brand img { height: 34px; width: auto; }
@media (prefers-color-scheme: light) { .brand img { filter: drop-shadow(0 1px 1.5px rgba(0, 0, 0, .55)); } }
.top-link { font-weight: 600; font-size: .92rem; text-decoration: none; padding: 8px 14px; border-radius: 999px; border: 1px solid var(--line2); color: var(--tx); }
.top-link:hover { color: var(--tx); background: var(--card2); }

/* hero */
.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); align-items: center; gap: 40px; padding: 56px 0 40px; }
.hero-pic { position: relative; margin: 0; border-radius: 22px; padding: 1.5px; background: var(--grad); box-shadow: 0 30px 70px -30px rgba(255, 106, 69, .55); }
.hero-pic > img { width: 100%; height: auto; border-radius: 21px; aspect-ratio: 16 / 10; object-fit: cover; }
.hero-pic figcaption { position: absolute; left: 14px; right: 14px; bottom: 14px; display: flex; align-items: center; gap: 10px; padding: 8px 12px 8px 8px;
  border-radius: 999px; background: rgba(5, 7, 14, .72); color: #eef1ff; font-size: .84rem; backdrop-filter: blur(6px); width: max-content; max-width: calc(100% - 28px); }
.hero-pic figcaption img { width: 32px; height: 32px; border-radius: 50%; box-shadow: 0 0 0 1.5px #e8b04f; flex: none; }
.eyebrow { margin: 0 0 8px; color: var(--dong); font: 600 .8rem/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0 0 12px; font-size: clamp(28px, 4.4vw, 48px); line-height: 1.1; letter-spacing: -.025em; font-weight: 800; text-wrap: balance; }
.lead { margin: 0 0 18px; max-width: 60ch; color: var(--mut); font-size: 1.08rem; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; list-style: none; }
.chips li { padding: 5px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); font-size: .84rem; font-weight: 600; }
.chips li::before { content: "✓"; color: var(--ok); margin-right: 6px; }

/* mục */
section { margin-bottom: 44px; }
.sec-h { margin: 0 0 16px; font-size: clamp(20px, 2.2vw, 26px); letter-spacing: -.015em; }
.note { margin: 14px 0 0; color: var(--mut); font-size: .9rem; }

/* thẻ hệ điều hành — hàng ngang */
.os-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(240px, 100%), 1fr)); gap: 16px; }
.os-card { position: relative; display: flex; flex-direction: column; gap: 16px; padding: 22px; border-radius: var(--r); background: var(--card); border: 1px solid var(--line);
  box-shadow: var(--shadow); min-width: 0; transition: border-color .15s, transform .15s; }
.os-card:hover { border-color: var(--line2); }
.os-card.is-main { border-color: var(--line2); background: linear-gradient(180deg, color-mix(in srgb, var(--dong) 10%, var(--card)), var(--card)); }
.os-h { display: flex; align-items: center; gap: 14px; }
.os-ic { width: 42px; height: 42px; flex: none; padding: 9px; border-radius: 12px; background: var(--card2); border: 1px solid var(--line); color: var(--dong); }
.os-h h3 { margin: 0; font-size: 1.12rem; letter-spacing: -.01em; }
.os-h p { margin: 2px 0 0; color: var(--mut); font-size: .86rem; }
.rec { display: none; position: absolute; top: -11px; left: 18px; padding: 2px 10px; border-radius: 999px; background: var(--btn); color: var(--on-btn); font-size: .72rem; font-weight: 700; }
.os-card.is-main .rec { display: inline-block; }
html:not([data-os]) .os-card.is-main .rec { display: none; }  /* không nhận ra máy (không JS / điện thoại): không ghi «gợi ý» */
.dl-btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; padding: 10px 18px; border-radius: 12px; font-weight: 700;
  text-decoration: none; color: var(--tx); background: transparent; border: 1.5px solid var(--line2); transition: filter .15s, background .15s; }
.dl-btn svg { width: 20px; height: 20px; }
.dl-btn:hover { color: var(--tx); background: var(--card2); }
.os-card.is-main .dl-btn, .ext-card .dl-btn { background: var(--btn); color: var(--on-btn); border-color: transparent; box-shadow: 0 10px 26px -12px rgba(255, 116, 23, .7); }
.os-card.is-main .dl-btn:hover, .ext-card .dl-btn:hover { filter: brightness(1.06); color: var(--on-btn); }
.dl-btn.is-off { color: var(--mut); border-style: dashed; border-color: var(--line); cursor: default; box-shadow: none; }
.os-card.is-soon { background: var(--card); }
.os-card.is-soon.is-main .dl-btn { background: transparent; color: var(--mut); box-shadow: none; border: 1.5px dashed var(--line); }
.meta { display: flex; flex-wrap: wrap; gap: 4px 12px; margin: -4px 0 0; color: var(--mut); font-size: .82rem; }
.meta span + span:not(.fn)::before { content: "·"; margin-right: 12px; opacity: .6; }
.meta .fn { flex-basis: 100%; font-family: var(--mono); font-size: .74rem; overflow-wrap: anywhere; opacity: .85; }
.os-card .meta { margin-top: auto; }
.mobile-note { padding: 12px 14px; border-radius: 12px; border: 1px solid var(--line2); background: var(--card); color: var(--tx); }

/* bước ngang */
.stepper { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr)); gap: 16px; counter-reset: s; }
.stepper li { counter-increment: s; position: relative; padding: 18px 18px 18px 64px; border-radius: 14px; background: var(--card); border: 1px solid var(--line); min-width: 0; }
.stepper li::before { content: counter(s); position: absolute; left: 18px; top: 18px; width: 32px; height: 32px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 800; color: var(--dong); border: 1.5px solid var(--line2); background: var(--card2); }
.stepper b { display: block; margin-bottom: 4px; }
.stepper span { color: var(--mut); font-size: .9rem; }

/* tiện ích trình duyệt */
.ext-card { padding: 26px; border-radius: 22px; background: linear-gradient(180deg, var(--card2), var(--card)); border: 1px solid var(--line2); box-shadow: var(--shadow); }
.ext-h { display: grid; grid-template-columns: auto minmax(0, 1fr) auto; gap: 18px; align-items: center; margin-bottom: 22px; }
.ext-t h2 { margin: 0 0 6px; font-size: clamp(20px, 2.2vw, 26px); }
.ext-t p { margin: 0; color: var(--mut); max-width: 62ch; }
.ext-dl { display: flex; flex-direction: column; align-items: flex-end; gap: 10px; }
.ext-dl .meta { margin: 0; justify-content: flex-end; }
.stepper.four { grid-template-columns: repeat(auto-fit, minmax(min(210px, 100%), 1fr)); }
.ext-card .stepper li { background: var(--card); }
.mac-hint { display: none; }
html.mac-soon .mac-hint { display: block; color: var(--tx); font-weight: 600; }

/* câu hỏi gập */
.faq { display: grid; gap: 10px; }
.faq details { border-radius: 14px; background: var(--card); border: 1px solid var(--line); }
.faq summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 18px; font-weight: 600; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: ""; flex: none; width: 9px; height: 9px; border-right: 2px solid var(--mut); border-bottom: 2px solid var(--mut); transform: rotate(45deg); transition: transform .15s; }
.faq details[open] summary::after { transform: rotate(-135deg); }
.faq-b { padding: 0 18px 16px; color: var(--mut); }
.faq-b p { margin: 0 0 10px; }
.faq-b b { color: var(--tx); }
.code { position: relative; margin: 0 0 12px; }
.code pre { margin: 0; padding: 14px 92px 14px 16px; border-radius: 12px; background: var(--bg2); border: 1px solid var(--line); color: var(--tx); white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.7; }
.code pre code { background: none; border: 0; padding: 0; }
.copy { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; min-height: 34px; border-radius: 9px; border: 1px solid var(--line); background: var(--card2);
  color: var(--tx); font: 600 .8rem var(--sans); cursor: pointer; }
.copy svg { width: 15px; height: 15px; }
.copy:hover { border-color: var(--line2); }
.copy.ok { color: var(--ok); border-color: var(--ok); }
.copy[hidden] { display: none; }
.code .copy { position: absolute; top: 8px; right: 8px; }
.sum-wrap { margin: 0 0 12px; border-radius: 12px; border: 1px solid var(--line); overflow: hidden; }
.sums { width: 100%; border-collapse: collapse; font-size: .84rem; }
.sums th, .sums td { padding: 10px 12px; text-align: left; vertical-align: middle; border-top: 1px solid var(--line); }
.sums tr:first-child th, .sums tr:first-child td { border-top: 0; }
.sums th { color: var(--tx); font-weight: 600; white-space: nowrap; width: 1%; }
.sums td code { display: block; background: none; border: 0; padding: 0; font-size: .78rem; color: var(--mut); overflow-wrap: anywhere; word-break: break-all; }
.sums td:last-child { width: 1%; }

/* chân trang */
.foot { border-top: 1px solid var(--line); padding: 26px 0 36px; color: var(--mut); font-size: .86rem; }
.foot-in { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; }
.foot p { margin: 0; display: flex; align-items: center; gap: 8px; }
.foot-ic { width: 18px; height: 18px; color: var(--ok); flex: none; }

@media (max-width: 760px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 22px; padding: 28px 0 24px; }
  .hero-pic { order: -1; }
  .hero-pic figcaption { font-size: .78rem; }
  .ext-h { grid-template-columns: auto minmax(0, 1fr); }
  .ext-dl { grid-column: 1 / -1; align-items: stretch; }
  .ext-dl .meta { justify-content: flex-start; }
  .ext-card { padding: 18px; }
  .os-card { padding: 18px; }
  .dl-btn { width: 100%; }
  .sums th { white-space: normal; width: auto; }
  .sums tr { display: grid; grid-template-columns: minmax(0, 1fr) auto; }
  .sums th { grid-column: 1; } .sums td:last-child { grid-column: 2; grid-row: 1; }
  .sums td:nth-child(2) { grid-column: 1 / -1; padding-top: 0; border-top: 0; }
  .top-link { padding: 6px 12px; font-size: .84rem; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }
html.mac-soon .ext-card { box-shadow: 0 0 0 2px var(--line2), var(--shadow); }
/* phản biện 20/10 */
.os-h p { min-height: 2.9em; }
.dl-alt { min-height: 40px; font-size: .9rem; border-style: solid; }
html.mac-soon .is-soon .dl-alt { background: var(--btn); color: var(--on-btn); border-color: transparent; }
.dl-btn.is-off { opacity: .8; color: var(--tx); }
code.blk { display: block; width: max-content; max-width: 100%; margin: 3px 0; }
.stepper.four li { align-self: stretch; }
@media (min-width: 761px) { .nw { white-space: nowrap; } }
@media (max-width: 760px) { .foot-in { justify-content: flex-start; } .os-h p { min-height: 0; } }