/* Layout concept: a shop drawing. Hairline dimension marks, mm-style labels, one amber LED glow as the single bold move. */
:root {
  --paper: #f4f6fa;
  --paper-2: #e7ecf4;
  --ink: #0f1b33;
  --ink-soft: #46546b;
  --line: #c5cede;
  --blue: #035eaf;
  --brand: #035eaf;
  --brand-2: #0098d9;
  --brand-dk: #02467f;
  --brand-text: #035eaf;
  --led: #d98a00;
  --led-ink: #1a1203;
  --night: #0b1a3a;
  --glow: rgba(217, 138, 0, 0.0);
  --font-display: "Barlow Condensed", "Arial Narrow", Impact, sans-serif;
  --font-body: "Be Vietnam Pro", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0b1220; --paper-2: #121b2d; --ink: #e8edf6; --ink-soft: #a3aec2;
    --line: #26324a; --blue: #7fb4ff; --led: #ffb52e; --led-ink: #1a1203;
    --brand: #1f7fd6; --brand-2: #3cc0f5; --brand-dk: #1668b3; --brand-text: #7cc4ff; --night: #07101f;
    --glow: rgba(255, 181, 46, 0.55); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0b1220; --paper-2: #121b2d; --ink: #e8edf6; --ink-soft: #a3aec2;
  --line: #26324a; --blue: #7fb4ff; --led: #ffb52e; --led-ink: #1a1203;
  --brand: #1f7fd6; --brand-2: #3cc0f5; --brand-dk: #1668b3; --brand-text: #7cc4ff; --night: #07101f;
  --glow: rgba(255, 181, 46, 0.55); color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--paper); color: var(--ink);
  font-family: var(--font-body); font-size: 16px; line-height: 1.65;
  margin: 0;
  padding-block: 0;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
a { color: inherit; }
:focus-visible { outline: 2px solid var(--led); outline-offset: 3px; }
.wrap { max-width: 1160px; margin: 0 auto; }
.mono { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--ink-soft); }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.14; letter-spacing: .005em; text-wrap: balance; margin: 0; }
h2 { font-size: clamp(34px, 5vw, 54px); }
p { margin: 0; }

/* header */
header.top { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20; background: var(--paper); border-bottom: 1px solid var(--line); margin-inline: calc(-1 * max(16px, env(safe-area-inset-left, 0px))); padding-inline: max(16px, env(safe-area-inset-left, 0px)); }
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); background: var(--paper); z-index: 30; }
.bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 12px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; line-height: 1; }
.brand picture, .brand img { display: block; }
.brand img { height: 64px; width: auto; }
@media (max-width: 520px) { .brand img { height: 52px; } }
.brand .bt { display: flex; flex-direction: column; }
.brand b { font-family: var(--font-display); font-size: 25px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--brand-text); }
.brand span { font-family: var(--font-mono); font-size: 10px; letter-spacing: .14em; color: var(--ink-soft); text-transform: uppercase; margin-top: 4px; }
nav { display: flex; gap: 22px; align-items: center; }
nav a { text-decoration: none; font-size: 14px; font-weight: 500; color: var(--ink-soft); }
nav a:hover { color: var(--ink); }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; font: 600 15px var(--font-body); text-decoration: none; border: 1px solid var(--brand); background: var(--brand); color: #fff; cursor: pointer; border-radius: 2px; }
.btn:hover { background: var(--brand-dk); border-color: var(--brand-dk); color: #fff; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--brand); }
.btn.ghost:hover { background: var(--brand); color: #fff; border-color: var(--brand); }
nav .btn { padding: 9px 16px; font-size: 14px; }
@media (max-width: 820px) { nav a:not(.btn) { display: none; } }

/* hero */
.hero { display: grid; grid-template-columns: 1.05fr 1fr; gap: 48px; align-items: center; padding-block: 64px 56px; }
.hero > * { min-width: 0; }
.hero h1 { font-size: clamp(48px, 8vw, 98px); text-transform: uppercase; }
.hero h1 em { font-style: normal; color: var(--brand-2); }
.hero .lead { margin-top: 24px; max-width: 52ch; color: var(--ink-soft); font-size: 18px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.plate { position: relative; border: 1px solid var(--line); background: var(--paper-2); }
.plate svg { display: block; width: 100%; height: auto; }
.plate .cap { position: absolute; left: 12px; bottom: 10px; }
.sign-t { font-family: var(--font-display); font-weight: 700; letter-spacing: .06em; }
.led-glow { filter: drop-shadow(0 0 6px var(--glow)) drop-shadow(0 0 18px var(--glow)); }
@keyframes breathe { 0%, 100% { opacity: 1; } 50% { opacity: .82; } }
.led-glow { animation: breathe 4.5s ease-in-out infinite; }
@media (prefers-reduced-motion: reduce) { .led-glow { animation: none; } html { scroll-behavior: auto; } }
@media (max-width: 900px) { .hero { grid-template-columns: 1fr; padding-block: 40px; gap: 32px; } }

/* facts */
.facts { display: grid; grid-template-columns: repeat(4, 1fr); border-block: 1px solid var(--line); }
.facts div { padding: 20px 20px 20px 0; }
.facts div + div { padding-left: 20px; border-left: 1px solid var(--line); }
.facts b { display: block; font-family: var(--font-display); font-size: 34px; font-weight: 600; line-height: 1.1; }
.facts span { font-size: 14px; color: var(--ink-soft); }
@media (max-width: 760px) { .facts { grid-template-columns: 1fr 1fr; } .facts div:nth-child(3) { padding-left: 0; border-left: 0; } .facts div:nth-child(n+3) { border-top: 1px solid var(--line); } }

section { padding-block: 88px 0; }
.sec-head { display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; align-items: end; margin-bottom: 40px; }
.sec-head p { color: var(--ink-soft); max-width: 56ch; }
.sec-head .mono { grid-column: 1 / -1; }
@media (max-width: 760px) { .sec-head { grid-template-columns: 1fr; } }

/* services */
.svc { border-top: 1px solid var(--ink); }
.row { display: grid; gap: 24px 32px; padding-block: 32px; border-bottom: 1px solid var(--line); align-items: start; }
.row h3 { font-size: clamp(28px, 3.4vw, 40px); }
.row p { color: var(--ink-soft); }
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.tags li { list-style: none; font-size: 13px; padding: 4px 10px; border: 1px solid var(--line); }
.tags { padding: 0; }


/* illustrations */
.art { margin: 0; position: relative; border: 1px solid var(--line); background: var(--paper-2); }
.art svg { display: block; width: 100%; height: auto; }
.art figcaption { padding: 6px 10px; border-top: 1px solid var(--line); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: var(--font-mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-soft); }
.art .k { fill: none; stroke: var(--ink); stroke-width: 1.4; }
.art .f { fill: var(--paper); stroke: var(--ink); stroke-width: 1.4; }
.art .f2 { fill: var(--paper-2); stroke: var(--ink); stroke-width: 1.4; }
.art .dk { fill: var(--night); stroke: none; }
.art .l { fill: var(--led); stroke: none; }
.art .ls { fill: none; stroke: var(--led); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.art .b { fill: none; stroke: var(--blue); stroke-width: 1; }
.art .bt { fill: var(--blue); font-family: var(--font-mono); font-size: 10px; }
.art .gl { stroke: var(--line); stroke-width: .6; fill: none; }
.art .tx { font-family: var(--font-display); font-weight: 700; letter-spacing: .08em; }
.row { grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); align-items: center; }
.row:nth-child(even) .art { order: 2; }
.row h3 { margin-bottom: 14px; }
@media (max-width: 820px) { .row { grid-template-columns: 1fr; } .row:nth-child(even) .art { order: 0; } }

/* process */
.proc { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--line); }
.proc div { padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--paper); }
.proc div:nth-child(3n) { border-right: 0; }
.proc div:nth-child(n+4) { border-bottom: 0; }
.proc h3 { font-size: 28px; margin: 10px 0 8px; }
.proc p { color: var(--ink-soft); font-size: 15px; }
@media (max-width: 860px) { .proc { grid-template-columns: 1fr; } .proc div { border-right: 0 !important; border-bottom: 1px solid var(--line) !important; } .proc div:last-child { border-bottom: 0 !important; } }

/* commitments */
.commit { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.commit > * { min-width: 0; }
.commit ul { margin: 0; padding: 0; }
.commit li { list-style: none; padding: 18px 0 18px 28px; border-top: 1px solid var(--line); position: relative; }
.commit li::before { content: ""; position: absolute; left: 0; top: 29px; width: 12px; height: 2px; background: var(--led); }
.commit li b { display: block; font-weight: 600; }
.commit li span { color: var(--ink-soft); font-size: 15px; }
@media (max-width: 860px) { .commit { grid-template-columns: 1fr; gap: 24px; } }

/* contact */
.contact { display: grid; grid-template-columns: 1fr 1.1fr; gap: 56px; }
.contact > * { min-width: 0; }
.addr { display: grid; gap: 22px; margin-top: 28px; }
.addr div { border-top: 1px solid var(--line); padding-top: 14px; }
.addr b { display: block; font-weight: 600; }
.big-phone { font-family: var(--font-display); font-size: clamp(40px, 6vw, 64px); font-weight: 600; line-height: 1; margin-top: 24px; display: block; user-select: all; }
form { display: grid; gap: 16px; border: 1px solid var(--ink); padding: 28px; background: var(--paper-2); }
label { display: grid; gap: 6px; font-size: 14px; font-weight: 500; }
input, select, textarea { font: 400 16px var(--font-body); padding: 11px 12px; border: 1px solid var(--line); background: var(--paper); color: var(--ink); border-radius: 2px; width: 100%; }
textarea { min-height: 96px; resize: vertical; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.out { display: grid; gap: 12px; }
.out textarea { font-family: var(--font-mono); font-size: 13px; min-height: 170px; }
.note { font-size: 13px; color: var(--ink-soft); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
@media (max-width: 860px) { .contact { grid-template-columns: 1fr; gap: 36px; } .two { grid-template-columns: 1fr; } }

footer { margin-top: 96px; border-top: 1px solid var(--ink); padding-block: 32px 40px; display: grid; grid-template-columns: 1fr 1fr; gap: 24px 48px; font-size: 14px; color: var(--ink-soft); }
footer b { color: var(--ink); font-weight: 600; }
@media (max-width: 760px) { footer { grid-template-columns: 1fr; } }

/* ===== multi-page additions ===== */
main { display: block; }
section { padding-block: 0; }
.block { padding-block: 72px 0; }
.block > h2 { margin-bottom: 20px; }
.sub { color: var(--ink-soft); max-width: 60ch; margin-bottom: 32px; }
nav a:not(.btn) { display: inline; }
nav a, .brand b, .brand span { white-space: nowrap; }
.menu-btn { display: none; font: 600 14px var(--font-body); padding: 8px 14px; border: 1px solid var(--ink); background: transparent; color: var(--ink); border-radius: 2px; cursor: pointer; }
/* menu thả xuống */
.dd { position: relative; display: inline-flex; align-items: center; padding-block: 14px; margin-block: -14px; }
.dd > a::after { content: "▾"; font-size: 10px; margin-left: 5px; }
.dd .sub { display: none; position: absolute; top: 100%; left: -16px; min-width: 240px; padding: 8px 0; background: var(--paper); border: 1px solid var(--line); box-shadow: 0 10px 28px rgba(3, 40, 90, .14); z-index: 30; }
.dd:hover .sub, .dd:focus-within .sub { display: block; }
.dd .sub a { display: block; padding: 9px 18px; color: var(--ink-soft); }
.dd .sub a:hover { color: var(--brand-text); background: var(--paper-2); }
@media (max-width: 1140px) {
  .menu-btn { display: inline-block; }
  .bar { flex-wrap: wrap; }
  nav { display: none; flex-direction: column; align-items: stretch; gap: 0; width: 100%; padding-bottom: 12px; }
  nav.open { display: flex; }
  nav a { padding: 12px 0; border-top: 1px solid var(--line); }
  nav a.btn { margin-top: 8px; justify-content: center; border-top: 1px solid var(--ink); }
  .dd { display: block; padding: 0; margin: 0; }
  .dd > a { display: block; font-weight: 600; color: var(--ink); }
  .dd > a::after { content: none; }
  .dd .sub { display: block; position: static; min-width: 0; padding: 0 0 0 16px; border: 0; box-shadow: none; background: none; }
  .dd .sub a { padding: 10px 0; font-size: 14px; }
}
.crumbs { padding-block: 16px 0; font-size: 13px; color: var(--ink-soft); }
.crumbs ol { display: flex; flex-wrap: wrap; gap: 6px; list-style: none; margin: 0; padding: 0; }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--line); }
.crumbs a { text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.page { padding-block: 32px 0; }
.page h1 { font-size: clamp(36px, 5.2vw, 60px); margin-bottom: 20px; }
.page-top { display: grid; grid-template-columns: 1.1fr 1fr; gap: 40px; align-items: center; margin-bottom: 40px; }
.page-top > * { min-width: 0; }
.page-top p { color: var(--ink-soft); font-size: 17px; max-width: 56ch; margin-bottom: 14px; }
@media (max-width: 860px) { .page-top { grid-template-columns: 1fr; gap: 24px; } }
.prose { max-width: 760px; }
.prose section { margin-top: 40px; }
.prose h2 { font-size: clamp(28px, 3.4vw, 38px); margin: 40px 0 14px; }
.prose section:first-child h2 { margin-top: 0; }
.prose h3 { font-size: 24px; margin: 22px 0 6px; }
.prose p { margin: 0 0 14px; color: var(--ink); }
.prose ul { padding-left: 20px; margin: 0 0 14px; }
.prose li { margin-bottom: 8px; }
.prose a, .faq a, .rels a { text-underline-offset: 3px; }
.prose a { color: var(--blue); }
.tbl { overflow-x: auto; margin: 16px 0 24px; border: 1px solid var(--line); }
.tbl table { border-collapse: collapse; width: 100%; min-width: 560px; font-size: 15px; }
.tbl th, .tbl td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tbl th { background: var(--paper-2); font-weight: 600; }
.faq { padding-block: 72px 0; }
.faq > * { max-width: 860px; }
.faq h2 { margin-bottom: 16px; }
.faq details { border-top: 1px solid var(--line); padding: 16px 0; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; font-weight: 600; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-family: var(--font-mono); color: var(--led); }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin-top: 10px; color: var(--ink-soft); }
.rels { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; }
.rel { display: block; padding: 20px; border: 1px solid var(--line); text-decoration: none; background: var(--paper); }
.rel:hover { border-color: var(--led); }
.rel b { display: block; font-family: var(--font-display); font-size: 24px; font-weight: 600; margin-bottom: 4px; }
.rel span { color: var(--ink-soft); font-size: 14px; }
.svc-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 1140px) { .svc-grid { grid-template-columns: repeat(3, 1fr); } }
.svc-card { min-width: 0; }
.svc-card h3 { font-size: 28px; margin: 16px 0 6px; }
.svc-card h3 a { text-decoration: none; }
.svc-card p { color: var(--ink-soft); font-size: 15px; margin-bottom: 8px; }
.more { font-weight: 600; font-size: 14px; color: var(--blue); text-underline-offset: 3px; }
@media (max-width: 960px) { .svc-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .svc-grid { grid-template-columns: 1fr; } }
.cta-band { display: flex; flex-wrap: wrap; gap: 20px 40px; align-items: center; justify-content: space-between; padding: 32px; background: var(--night); color: #eceae3; border: 1px solid var(--line); }
.cta-band h2 { color: #eceae3; font-size: 36px; }
.cta-band p { color: #b7bcc6; margin-top: 6px; }
.cta-band .btn { background: var(--led); border-color: var(--led); color: var(--led-ink); }
.cta-band .btn.ghost { background: transparent; color: #eceae3; border-color: #eceae3; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.commit2 { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.commit2 > * { min-width: 0; }
.commit2 ul { margin: 0; padding: 0; }
.commit2 li { list-style: none; padding: 16px 0 16px 28px; border-top: 1px solid var(--line); position: relative; }
.commit2 li::before { content: ""; position: absolute; left: 0; top: 27px; width: 12px; height: 2px; background: var(--led); }
.commit2 li b { display: block; }
.commit2 li span { color: var(--ink-soft); font-size: 15px; }
@media (max-width: 860px) { .commit2 { grid-template-columns: 1fr; gap: 24px; } }
.proc div { background: var(--paper); }
.hero { padding-block: 56px 48px; }
.site-foot { display: block; margin-top: 96px; border-top: 1px solid var(--ink); padding-block: 40px 28px; font-size: 14px; color: var(--ink-soft); margin-inline: calc(-1 * max(16px, env(safe-area-inset-left, 0px))); padding-inline: max(16px, env(safe-area-inset-left, 0px)); }
.foot-grid { display: grid; grid-template-columns: 1.3fr 1.3fr 1fr 1fr; gap: 28px; }
.foot-grid > * { min-width: 0; overflow-wrap: break-word; }
.foot-grid b { color: var(--ink); display: block; margin-bottom: 8px; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; }
.foot-grid li { margin-bottom: 6px; }
.foot-grid p { margin-bottom: 8px; }
.foot-grid a { text-underline-offset: 3px; }
.slogan { font-family: var(--font-display); font-size: 20px; color: var(--ink); }
.copy { margin-top: 28px; padding-top: 16px; border-top: 1px solid var(--line); font-size: 13px; }
@media (max-width: 860px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .foot-grid { grid-template-columns: 1fr; } }
.btn.zalo, .cta-band .btn.zalo { background: #0068ff; border-color: #0068ff; color: #fff; }
.btn.zalo:hover, .cta-band .btn.zalo:hover { background: #0050c8; border-color: #0050c8; color: #fff; }
.float-bar { display: none; }
@media (max-width: 820px) {
  .float-bar { display: flex; position: fixed; left: 0; right: 0; bottom: 0; z-index: 40; }
  .float-bar a { flex: 1; text-align: center; padding: 14px 8px calc(14px + env(safe-area-inset-bottom, 0px)); font-weight: 600; text-decoration: none; }
  .float-bar .call { flex: 1.4; background: var(--led); color: var(--led-ink); }
  .float-bar .zl { background: #0068ff; color: #fff; }
  body { padding-bottom: 56px; }
}
.contact { margin-top: 24px; align-items: start; }
.big-phone { text-underline-offset: 6px; }
.big-phone + .note { margin-top: 14px; }
form > .btn { justify-content: center; }

.hero h1 { font-size: clamp(38px, 5.6vw, 76px); }
.hero h1 em { display: inline; }
.hero h1 { margin-top: 18px; }

.page-top h1 { margin-bottom: 20px; }
.page-top .cta { margin-top: 22px; }
.prose .art { margin: 0 0 28px; }
.rel .art { margin-bottom: 14px; }
.contact .art { margin-bottom: 20px; max-width: 460px; }
[hidden] { display: none !important; }