/* HL AIR – brand: sky blue + silver */
:root {
  --blue: #1565d8;
  --blue-dark: #0d47a1;
  --blue-deep: #0a2a5c;
  --sky: #29a3f0;
  --silver: #c4cad1;
  --silver-light: #eef1f4;
  --text: #1c2733;
  --muted: #5b6876;
  --white: #fff;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(10, 42, 92, .12);
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--blue); }
h1, h2, h3 { line-height: 1.2; color: var(--blue-deep); margin: 0 0 .6em; }
h1 { font-size: clamp(1.9rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.2rem); }
h3 { font-size: 1.25rem; }
p { margin: 0 0 1em; }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 16px; }
.section { padding: 72px 0; }
.section--alt { background: var(--silver-light); }
.section__head { text-align: center; max-width: 720px; margin: 0 auto 40px; }
.section__head p { color: var(--muted); }
.eyebrow {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .12em;
  text-transform: uppercase; color: var(--blue); margin-bottom: .5em;
}
.skip { position: absolute; left: -999px; top: 0; background: var(--blue); color: #fff; padding: 8px 14px; z-index: 100; }
.skip:focus { left: 8px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px; border-radius: 999px; font-weight: 700; font-size: 1rem;
  text-decoration: none; border: 2px solid transparent; cursor: pointer;
  transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--blue); color: #fff; }
.btn--primary:hover { background: var(--blue-dark); }
.btn--outline { border-color: currentColor; color: var(--blue); background: transparent; }
.btn--light { border-color: #fff; color: #fff; background: transparent; }
.btn--light:hover { background: #fff; color: var(--blue-deep); }
.btn svg { width: 18px; height: 18px; fill: currentColor; flex-shrink: 0; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn-row--center { justify-content: center; }

/* Top bar */
.topbar { background: var(--blue-deep); color: #dfe8f5; font-size: .875rem; }
.topbar .container { display: flex; justify-content: space-between; gap: 12px; padding-top: 7px; padding-bottom: 7px; flex-wrap: wrap; }
.topbar a { color: #fff; text-decoration: none; }

/* Header */
.header { position: sticky; top: 0; z-index: 50; background: #fff; box-shadow: 0 2px 12px rgba(10, 42, 92, .08); }
.header .container { display: flex; align-items: center; gap: 20px; min-height: 92px; padding-top: 4px; padding-bottom: 4px; }
.logo { display: block; line-height: 0; }
.logo img { height: 84px; width: auto; }
.nav { margin-left: auto; }
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 28px; }
.nav a { text-decoration: none; color: var(--text); font-weight: 600; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--blue); }
.header__actions { display: flex; align-items: center; gap: 12px; }
.social { display: inline-flex; width: 38px; height: 38px; border-radius: 50%; align-items: center; justify-content: center; background: var(--silver-light); color: var(--blue); }
.social:hover { background: var(--blue); color: #fff; }
.social svg { width: 18px; height: 18px; fill: currentColor; }
.menu-toggle { display: none; background: none; border: 0; padding: 8px; cursor: pointer; }
.menu-toggle span { display: block; width: 26px; height: 3px; background: var(--blue-deep); margin: 5px 0; border-radius: 2px; }

/* Hero */
.hero {
  position: relative; color: #fff;
  background: linear-gradient(100deg, rgba(10, 42, 92, .94) 0%, rgba(13, 71, 161, .82) 55%, rgba(21, 101, 216, .55) 100%),
    url("../anh/aircon/outdoor-unit-installation.jpg") center 35% / cover no-repeat;
}
.hero .container { display: grid; grid-template-columns: 1.2fr 1fr; gap: 48px; align-items: center; padding-top: 72px; padding-bottom: 72px; }
.hero h1 { color: #fff; }
.hero p.lead { font-size: 1.12rem; color: #e3ecf8; max-width: 560px; }
.hero__points { list-style: none; padding: 0; margin: 24px 0 30px; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; }
.hero__points li { display: flex; align-items: center; gap: 10px; font-weight: 600; }
.hero__points li::before { content: ""; width: 20px; height: 20px; border-radius: 50%; flex-shrink: 0; background: var(--sky) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center / 14px no-repeat; }

.page-hero { background: linear-gradient(100deg, var(--blue-deep), var(--blue)); color: #fff; padding: 56px 0; }
.page-hero h1 { color: #fff; margin: 0 0 .3em; }
.page-hero p { color: #dfe8f5; margin: 0; max-width: 680px; }

/* Forms */
.card-form { background: #fff; color: var(--text); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.card-form h2 { font-size: 1.4rem; margin-bottom: .3em; }
.card-form > p { color: var(--muted); font-size: .95rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
label { display: block; font-weight: 600; font-size: .9rem; margin-bottom: 5px; }
input, select, textarea {
  width: 100%; font: inherit; padding: 11px 13px; border: 1px solid var(--silver);
  border-radius: 8px; background: #fff; color: var(--text);
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--sky); border-color: var(--sky); }
textarea { min-height: 110px; resize: vertical; }
.form-note { font-size: .85rem; color: var(--muted); margin-top: 10px; }
.form-status { margin-top: 12px; font-weight: 600; }
.form-status.ok { color: #1b7f3b; }
.form-status.err { color: #b3261e; }

/* Cards */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card { background: #fff; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.card img { aspect-ratio: 4 / 3; object-fit: cover; width: 100%; }
.card__body { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.card__body p { color: var(--muted); }
.card__link { margin-top: auto; font-weight: 700; text-decoration: none; }

/* Why */
.why { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.why img { border-radius: var(--radius); box-shadow: var(--shadow); aspect-ratio: 4 / 5; object-fit: cover; width: 100%; }
.ticks { list-style: none; padding: 0; margin: 0 0 28px; }
.ticks li { position: relative; padding-left: 36px; margin-bottom: 16px; }
.ticks li::before { content: ""; position: absolute; left: 0; top: 2px; width: 24px; height: 24px; border-radius: 50%; background: var(--blue) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='white'%3E%3Cpath d='M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z'/%3E%3C/svg%3E") center / 16px no-repeat; }
.ticks strong { color: var(--blue-deep); }

/* Gallery */
.gallery { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.gallery figure { margin: 0; position: relative; border-radius: 10px; overflow: hidden; }
.gallery img { aspect-ratio: 1; object-fit: cover; width: 100%; transition: transform .4s; }
.gallery figure:hover img { transform: scale(1.05); }
.gallery figcaption { position: absolute; left: 8px; bottom: 8px; background: rgba(10, 42, 92, .85); color: #fff; font-size: .75rem; font-weight: 600; padding: 3px 9px; border-radius: 999px; }

/* Areas */
.areas { text-align: center; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin: 24px 0; }
.chip { background: #fff; border: 1px solid var(--silver); border-radius: 999px; padding: 8px 18px; font-weight: 600; color: var(--blue-deep); }

/* CTA band */
.cta-band { background: linear-gradient(100deg, var(--blue-deep), var(--blue)); color: #fff; text-align: center; padding: 64px 0; }
.cta-band h2 { color: #fff; }
.cta-band p { color: #dfe8f5; max-width: 600px; margin: 0 auto 26px; }

/* Services page */
.service { display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px; align-items: start; padding: 64px 0; border-bottom: 1px solid var(--silver-light); scroll-margin-top: 90px; }
.service:nth-of-type(even) .service__media { order: -1; }
.service__media { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.service__media img { border-radius: 10px; aspect-ratio: 3 / 4; object-fit: cover; width: 100%; }
.service__media img:only-child { grid-column: 1 / -1; aspect-ratio: 4 / 3; }
.price-note { background: var(--silver-light); border-left: 4px solid var(--blue); padding: 12px 16px; border-radius: 6px; margin: 18px 0; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; }
.faq details { background: #fff; border: 1px solid var(--silver); border-radius: 10px; margin-bottom: 12px; }
.faq summary { cursor: pointer; padding: 16px 20px; font-weight: 700; color: var(--blue-deep); list-style: none; display: flex; justify-content: space-between; gap: 12px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.4rem; line-height: 1; color: var(--blue); }
.faq details[open] summary::after { content: "–"; }
.faq details p { padding: 0 20px 16px; margin: 0; color: var(--muted); }

/* About */
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
.two-col img { border-radius: var(--radius); box-shadow: var(--shadow); }
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li { padding: 14px 0; border-bottom: 1px solid var(--silver); display: flex; justify-content: space-between; gap: 16px; }
.info-list li span:first-child { font-weight: 700; color: var(--blue-deep); }

/* Contact */
.contact { display: grid; grid-template-columns: 1.4fr 1fr; gap: 40px; align-items: start; }
.contact-info { background: var(--silver-light); border-radius: var(--radius); padding: 28px; }
.contact-info h2 { font-size: 1.4rem; }
.contact-info dl { margin: 0; }
.contact-info dt { font-weight: 700; color: var(--blue-deep); margin-top: 14px; }
.contact-info dd { margin: 2px 0 0; }
.phone-big { font-size: 1.5rem; font-weight: 800; text-decoration: none; }

/* Footer */
.footer { background: #0b1f40; color: #b9c6d8; padding: 56px 0 0; font-size: .95rem; }
.footer a { color: #e3ecf8; text-decoration: none; }
.footer a:hover { color: #fff; text-decoration: underline; }
.footer__grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.3fr; gap: 32px; }
.footer__logo { background: #fff; border-radius: 10px; padding: 6px; display: inline-block; margin-bottom: 14px; }
.footer__logo img { height: 84px; width: auto; }
.footer h3 { color: #fff; font-size: 1.05rem; }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 8px; }
.footer .social { background: rgba(255, 255, 255, .1); color: #fff; }
.footer .social:hover { background: var(--blue); text-decoration: none; }
.footer__bottom { border-top: 1px solid rgba(255, 255, 255, .12); margin-top: 40px; padding: 18px 0; text-align: center; font-size: .85rem; }

/* Floating call (mobile) */
.float-call { display: none; position: fixed; right: 16px; bottom: 16px; z-index: 60; box-shadow: 0 8px 24px rgba(0, 0, 0, .25); }

/* Responsive */
@media (max-width: 960px) {
  .hero .container, .why, .two-col, .contact, .service { grid-template-columns: 1fr; }
  .service:nth-of-type(even) .service__media { order: 0; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .gallery { grid-template-columns: repeat(3, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .why img { aspect-ratio: 4 / 3; }
}
@media (max-width: 820px) {
  .menu-toggle { display: block; margin-left: auto; }
  .nav { position: absolute; top: 100%; left: 0; right: 0; background: #fff; box-shadow: 0 8px 16px rgba(10, 42, 92, .1); display: none; }
  .nav.open { display: block; }
  .nav ul { flex-direction: column; gap: 0; padding: 8px 16px 16px; }
  .nav li a { display: block; padding: 12px 0; border-bottom: 1px solid var(--silver-light); }
  .header__actions .btn { display: none; }
  .float-call { display: inline-flex; }
}
@media (max-width: 600px) {
  .section { padding: 52px 0; }
  .grid-3, .form-grid, .footer__grid { grid-template-columns: 1fr; }
  .gallery { grid-template-columns: 1fr 1fr; }
  .hero__points { grid-template-columns: 1fr; }
  .logo img { height: 68px; }
  .topbar .container { justify-content: center; text-align: center; }
  .card-form { padding: 20px; }
  .btn-row .btn { flex: 1 1 100%; }
  .footer { padding-bottom: 72px; }
}