/* ============================================================
   CƠ KHÍ THÀNH ĐỨC CNC — phong cách corporate DONG-A ENG
   Header trắng + dropdown · banner phụ · breadcrumb · sidebar trái
   ============================================================ */

:root {
  --navy: #1b4c91;
  --navy-dark: #143a70;
  --teal: #1a6b5f;
  --teal-dark: #14544b;
  --text: #333333;
  --muted: #6f7680;
  --line: #e2e5e9;
  --bg-gray: #f5f6f8;
  --footer-1: #3a3d42;
  --footer-2: #2c2f34;
  --footer-3: #212327;
  --font: "Be Vietnam Pro", "Segoe UI", system-ui, Arial, sans-serif;
  --serif: "Playfair Display", Georgia, serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--text);
  background: #fff;
  line-height: 1.7;
  font-size: 16px;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ---------- Utility bar ---------- */
.utility {
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  background: #fff;
}
.utility .container {
  display: flex;
  justify-content: flex-end;
  gap: 26px;
  height: 38px;
  align-items: center;
}
.utility a { color: var(--muted); font-weight: 500; }
.utility a:hover { color: var(--navy); }
.utility .sep { color: #d5d8dd; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: #fff;
  border-bottom: 1px solid var(--line);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 92px;
  gap: 30px;
}
.brand { display: flex; align-items: center; gap: 13px; }
.brand .mark {
  width: 54px; height: 54px;
  border-radius: 50%;
  overflow: hidden;
  border: 1px solid var(--line);
  flex: none;
}
.brand .mark img { width: 100%; height: 100%; object-fit: cover; }
.brand-name { font-weight: 800; font-size: 19px; letter-spacing: .01em; color: #111; line-height: 1.25; }
.brand-name small {
  display: block;
  font-size: 10.5px;
  font-weight: 600;
  color: var(--muted);
  letter-spacing: .2em;
  text-transform: uppercase;
}

.main-nav { display: flex; align-items: center; }
.nav-item { position: relative; }
.nav-item > a {
  display: block;
  padding: 33px 26px;
  font-weight: 700;
  font-size: 16.5px;
  color: #222;
  transition: color .18s;
  border-bottom: 3px solid transparent;
}
.nav-item > a:hover, .nav-item.current > a { color: var(--navy); border-bottom-color: var(--navy); }

.dropdown {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  min-width: 230px;
  background: #fff;
  border: 1px solid var(--line);
  border-top: 2px solid var(--navy);
  box-shadow: 0 14px 34px rgba(20, 30, 50, .12);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, transform .2s ease;
}
.nav-item:hover .dropdown, .nav-item:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown a {
  display: block;
  padding: 13px 22px;
  font-size: 14.5px;
  font-weight: 500;
  color: #444;
  border-bottom: 1px solid #f0f2f4;
  transition: background .15s, color .15s, padding-left .15s;
}
.dropdown a:last-child { border-bottom: 0; }
.dropdown a:hover { background: var(--bg-gray); color: var(--navy); padding-left: 27px; }

.burger {
  display: none;
  background: none;
  border: 1px solid var(--line);
  border-radius: 8px;
  width: 46px; height: 46px;
  cursor: pointer;
}
.burger span { display: block; width: 20px; height: 2px; background: #222; margin: 5px auto; }

/* ---------- HOME slider ---------- */
.slider {
  position: relative;
  height: calc(100vh - 130px);
  min-height: 480px;
  max-height: 780px;
  overflow: hidden;
  background: #101418;
}
.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1.2s ease;
  background-size: cover;
  background-position: center;
}
.slide.active { opacity: 1; }
.slide::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(10, 14, 20, .38);
}
.slide-caption {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
  padding: 0 24px;
  z-index: 2;
}
.slide-caption .line1, .slide-caption .line2 {
  font-family: var(--serif);
  font-size: clamp(26px, 4.4vw, 52px);
  font-weight: 600;
  letter-spacing: .04em;
  line-height: 1.35;
  text-shadow: 0 2px 18px rgba(0, 0, 0, .45);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .9s ease .3s, transform .9s ease .3s;
}
.slide-caption .line2 { transition-delay: .6s; }
.slide.active .slide-caption .line1,
.slide.active .slide-caption .line2 { opacity: 1; transform: none; }
.slide-caption .sub {
  margin-top: 22px;
  font-size: clamp(14px, 1.6vw, 17px);
  font-weight: 500;
  color: #e3e8ee;
  letter-spacing: .12em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity .9s ease .9s;
}
.slide.active .slide-caption .sub { opacity: 1; }

.slider-dots {
  position: absolute;
  left: 0; right: 0;
  bottom: 34px;
  display: flex;
  justify-content: center;
  gap: 12px;
  z-index: 3;
}
.slider-dots button {
  width: 13px; height: 13px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: transparent;
  cursor: pointer;
  padding: 0;
  transition: background .2s;
}
.slider-dots button.active { background: #fff; }

/* ---------- Quick links (trang chủ, dưới slider) ---------- */
.quick {
  border-bottom: 1px solid var(--line);
}
.quick .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.quick a {
  padding: 34px 26px;
  border-left: 1px solid var(--line);
  transition: background .2s;
}
.quick a:last-child { border-right: 1px solid var(--line); }
.quick a:hover { background: var(--bg-gray); }
.quick b { display: block; font-size: 17px; color: #1a2432; margin-bottom: 6px; font-weight: 700; }
.quick b::after { content: " →"; color: var(--navy); }
.quick span { font-size: 13.5px; color: var(--muted); }

/* ---------- Sub-page banner ---------- */
.sub-banner {
  position: relative;
  height: 300px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
}
.sub-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(12, 20, 34, .68), rgba(12, 20, 34, .28));
}
.sub-banner .container { position: relative; color: #fff; }
.sub-banner .slogan {
  font-family: var(--serif);
  font-size: clamp(24px, 3.4vw, 38px);
  font-weight: 600;
  letter-spacing: .03em;
  line-height: 1.4;
  text-shadow: 0 2px 14px rgba(0, 0, 0, .4);
}
.sub-banner .slogan small {
  display: block;
  font-family: var(--font);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: #c9d4e2;
  margin-bottom: 10px;
}

/* ---------- Breadcrumb bar ---------- */
.crumb {
  border-bottom: 1px solid var(--line);
  background: #fff;
}
.crumb .container {
  display: flex;
  align-items: stretch;
  height: 58px;
  padding: 0 24px;
}
.crumb .home {
  display: flex;
  align-items: center;
  padding: 0 22px;
  border-left: 1px solid var(--line);
  border-right: 1px solid var(--line);
  color: var(--muted);
}
.crumb .home:hover { color: var(--navy); }
.crumb .item {
  display: flex;
  align-items: center;
  padding: 0 34px;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--muted);
  border-right: 1px solid var(--line);
}
.crumb .item.now { color: #1a2432; font-weight: 700; }

/* ---------- Sub layout: sidebar + content ---------- */
.sub-wrap .container {
  display: grid;
  grid-template-columns: 262px 1fr;
  gap: 56px;
  align-items: start;
  padding-top: 0;
  padding-bottom: 90px;
}

.sidebar { margin-top: -62px; position: relative; z-index: 5; }
.sidebar .side-title {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy) 55%, #2f6cc0);
  color: #fff;
  padding: 34px 26px;
  position: relative;
  overflow: hidden;
}
.sidebar .side-title::after {
  content: "";
  position: absolute;
  width: 130px; height: 130px;
  right: -40px; bottom: -60px;
  background: rgba(255, 255, 255, .08);
  transform: rotate(45deg);
}
.sidebar .side-title b { font-size: 23px; font-weight: 800; display: block; line-height: 1.3; }
.sidebar .side-title span { font-size: 12.5px; color: #b9c9e2; letter-spacing: .08em; text-transform: uppercase; font-weight: 600; }
.side-menu { border: 1px solid var(--line); border-top: 0; background: #fff; }
.side-menu a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 22px;
  font-size: 15px;
  font-weight: 600;
  color: #444;
  border-bottom: 1px solid var(--line);
  transition: background .15s, color .15s;
}
.side-menu a:last-child { border-bottom: 0; }
.side-menu a::after { content: "›"; color: #b6bcc4; font-size: 18px; transition: color .15s; }
.side-menu a:hover { background: var(--bg-gray); color: var(--navy); }
.side-menu a.active { background: var(--teal); color: #fff; }
.side-menu a.active::after { color: #fff; }

/* ---------- Content ---------- */
.content { padding-top: 58px; min-width: 0; }
.page-title {
  font-size: clamp(28px, 3.2vw, 38px);
  font-weight: 300;
  letter-spacing: .01em;
  color: #23303f;
  line-height: 1.3;
  margin-bottom: 8px;
}
.page-title b { color: var(--navy); font-weight: 800; }
.page-title em { font-style: normal; color: var(--teal); font-weight: 800; }
.title-rule {
  width: 54px; height: 3px;
  background: var(--teal);
  margin: 22px 0 34px;
}
.content p.body { color: #555; margin-bottom: 18px; font-size: 16px; }
.content .lead-quote {
  font-size: 19px;
  color: #23303f;
  font-weight: 600;
  line-height: 1.6;
  border-left: 4px solid var(--navy);
  padding-left: 20px;
  margin-bottom: 26px;
}

.photo-band { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; margin-bottom: 38px; }
.photo-band img { width: 100%; height: 240px; object-fit: cover; }
.photo-wide { margin-bottom: 38px; }
.photo-wide img { width: 100%; height: 340px; object-fit: cover; }
.photo-wide figcaption, .photo-band figcaption {
  font-size: 13px; color: var(--muted); padding-top: 9px;
}

.sign-off { margin-top: 36px; text-align: right; }
.sign-off span { display: block; font-size: 14px; color: var(--muted); }
.sign-off b { font-size: 21px; font-weight: 800; color: #23303f; font-family: var(--serif); }

/* bảng thông số kiểu Hàn */
.spec-table { width: 100%; border-collapse: collapse; margin: 8px 0 34px; font-size: 15px; }
.spec-table th, .spec-table td { border: 1px solid var(--line); padding: 13px 18px; text-align: left; }
.spec-table th { background: var(--bg-gray); color: #23303f; font-weight: 700; width: 220px; }
.spec-table td { color: #555; }

/* mục con trong content */
.sec-h {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 21px;
  font-weight: 800;
  color: #23303f;
  margin: 42px 0 18px;
}
.sec-h::before { content: ""; width: 14px; height: 14px; background: var(--navy); clip-path: polygon(0 0, 100% 0, 100% 100%); }

.check-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-bottom: 30px; }
.check-grid li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  border: 1px solid var(--line);
  background: #fff;
  padding: 15px 18px;
  font-size: 15px;
}
.check-grid li b { display: block; font-size: 15.5px; color: #23303f; }
.check-grid li span { color: var(--muted); font-size: 13.5px; }
.check-grid li::before {
  content: "✓";
  color: var(--teal);
  font-weight: 800;
  flex: none;
  margin-top: 1px;
}

/* quy trình ngang kiểu Hàn */
.proc-flow { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin: 10px 0 40px; }
.proc-item {
  border: 1px solid var(--line);
  background: #fff;
  text-align: center;
  padding: 26px 14px 22px;
  position: relative;
}
.proc-item .step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--navy);
  color: #fff;
  font-weight: 800;
  margin-bottom: 14px;
}
.proc-item:nth-child(even) .step-no { background: var(--teal); }
.proc-item b { display: block; font-size: 15.5px; color: #23303f; margin-bottom: 6px; }
.proc-item span { font-size: 13px; color: var(--muted); line-height: 1.55; display: block; }

/* gallery */
.g-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; margin-bottom: 30px; }
.g-item { border: 1px solid var(--line); background: #fff; }
.g-item .ph { aspect-ratio: 4 / 3; overflow: hidden; }
.g-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .45s; }
.g-item:hover img { transform: scale(1.05); }
.g-item figcaption { padding: 14px 18px; font-size: 14px; color: #444; font-weight: 600; border-top: 1px solid var(--line); }

/* ---------- Contact ---------- */
.contact-cols { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.info-table { width: 100%; border-collapse: collapse; font-size: 15px; margin-bottom: 26px; }
.info-table th, .info-table td { border: 1px solid var(--line); padding: 14px 18px; text-align: left; vertical-align: top; }
.info-table th { background: var(--bg-gray); width: 150px; color: #23303f; font-weight: 700; }
.info-table td { color: #555; }
.info-table a { color: var(--navy); font-weight: 600; }
.info-table a:hover { text-decoration: underline; }

.form-box { border: 1px solid var(--line); background: var(--bg-gray); padding: 30px 28px; }
.form-box h3 { font-size: 19px; font-weight: 800; color: #23303f; margin-bottom: 4px; }
.form-box .sub { font-size: 14px; color: var(--muted); margin-bottom: 20px; }
.form-box label { display: block; font-size: 13.5px; font-weight: 700; color: #23303f; margin: 14px 0 6px; }
.form-box input, .form-box textarea {
  width: 100%;
  border: 1px solid #d4d9df;
  background: #fff;
  padding: 12px 14px;
  font-family: var(--font);
  font-size: 15px;
  color: var(--text);
}
.form-box input:focus, .form-box textarea:focus { outline: none; border-color: var(--navy); }
.form-box textarea { min-height: 110px; resize: vertical; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 30px;
  font-weight: 700;
  font-size: 15px;
  cursor: pointer;
  border: 0;
  transition: background .2s;
}
.btn-navy { background: var(--navy); color: #fff; }
.btn-navy:hover { background: var(--navy-dark); }
.form-box .btn { width: 100%; margin-top: 20px; }

/* ---------- Footer ---------- */
.f-top { background: var(--footer-1); }
.f-top .container {
  display: flex;
  gap: 28px;
  height: 52px;
  align-items: center;
  font-size: 13.5px;
  color: #c3c7cd;
}
.f-top a:hover { color: #fff; }
.f-top .sep { color: #5c6066; }

.f-map { background: var(--footer-2); padding: 44px 0 40px; }
.f-map .container { display: grid; grid-template-columns: repeat(4, 1fr); gap: 34px; }
.f-map h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.f-map a { display: block; color: #9aa0a8; font-size: 13.5px; padding: 4.5px 0; }
.f-map a:hover { color: #fff; }

.f-bottom { background: var(--footer-3); padding: 26px 0 30px; font-size: 13px; color: #85898f; line-height: 1.9; }
.f-bottom b { color: #b9bec5; }

/* ---------- Floating Zalo ---------- */
.float-zalo {
  position: fixed;
  right: 22px; bottom: 22px;
  z-index: 90;
  width: 54px; height: 54px;
  border-radius: 50%;
  background: #0068ff;
  color: #fff;
  font-weight: 800;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 24px rgba(0, 40, 100, .35);
  transition: transform .2s;
}
.float-zalo:hover { transform: scale(1.08); }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .nav-item > a { padding: 33px 16px; font-size: 15.5px; }
  .sub-wrap .container { grid-template-columns: 230px 1fr; gap: 36px; }
  .quick .container { grid-template-columns: 1fr 1fr; }
  .quick a { border: 1px solid var(--line); margin: -1px 0 0 -1px; }
  .f-map .container { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .utility { display: none; }
  .site-header .container { height: 74px; }
  .main-nav {
    position: fixed;
    top: 74px; left: 0; right: 0;
    background: #fff;
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    display: none;
    box-shadow: 0 18px 30px rgba(20, 30, 50, .12);
    max-height: calc(100vh - 74px);
    overflow-y: auto;
  }
  .main-nav.open { display: flex; }
  .nav-item > a { padding: 15px 24px; border-bottom: 1px solid #f0f2f4; }
  .nav-item.current > a { border-bottom-color: #f0f2f4; }
  .dropdown {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    box-shadow: none;
    border: 0;
    border-top: 0;
    background: var(--bg-gray);
  }
  .dropdown a { padding-left: 40px; }
  .burger { display: block; }
  .slider { height: 62vh; min-height: 380px; }
  .sub-wrap .container { grid-template-columns: 1fr; gap: 0; }
  .sidebar { margin-top: 0; }
  .sidebar .side-title { padding: 22px 24px; }
  .sidebar .side-title b { font-size: 19px; }
  .side-menu { display: flex; flex-wrap: wrap; }
  .side-menu a { flex: 1 1 auto; border-right: 1px solid var(--line); font-size: 14px; padding: 12px 16px; }
  .content { padding-top: 42px; }
  .contact-cols, .check-grid, .g-grid, .photo-band { grid-template-columns: 1fr; }
  .proc-flow { grid-template-columns: 1fr 1fr; }
  .crumb .item { padding: 0 18px; }
}

@media (max-width: 560px) {
  .proc-flow { grid-template-columns: 1fr; }
  .quick .container { grid-template-columns: 1fr; }
  .sub-banner { height: 220px; }
  .f-map .container { grid-template-columns: 1fr; }
}