/* ============================================
   ZTGAOKE Machinery - Global English Website
   Responsive styles
   ============================================ */
:root {
  --navy: #0d2137;
  --navy-2: #123152;
  --blue: #1565c0;
  --orange: #f57c00;
  --orange-dark: #e65100;
  --gray-bg: #f4f6f9;
  --gray-line: #e3e8ef;
  --text: #2b3440;
  --text-light: #6b7684;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 6px 24px rgba(13, 33, 55, 0.08);
  --max-w: 1200px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  line-height: 1.7;
  background: var(--white);
}

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

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Top bar ---------- */
.topbar {
  background: var(--navy);
  color: #cfd8e3;
  font-size: 13px;
}
.topbar .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 38px;
  gap: 16px;
}
.topbar span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar a { color: #ffd180; }
.topbar a:hover { color: #ffab40; }

/* ---------- Header ---------- */
.header {
  background: var(--white);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(13, 33, 55, 0.06);
}
.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 78px;
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-mark {
  width: 46px; height: 46px;
  background: linear-gradient(135deg, var(--blue), var(--navy));
  color: #fff; font-weight: 800; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 8px; letter-spacing: -1px;
}
.logo-text .brand {
  font-size: 17px; font-weight: 700; color: var(--navy);
  letter-spacing: 0.5px; line-height: 1.2;
}
.logo-text .tagline {
  font-size: 11px; color: var(--text-light);
  text-transform: uppercase; letter-spacing: 1.5px;
}

.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  border-radius: 6px;
  transition: color .2s, background .2s;
}
.nav a:hover { color: var(--blue); background: var(--gray-bg); }
.nav a.active { color: var(--blue); }
.nav .btn-quote {
  background: var(--orange);
  color: #fff;
  margin-left: 8px;
}
.nav .btn-quote:hover { background: var(--orange-dark); color: #fff; }

.menu-toggle {
  display: none;
  background: none; border: none; cursor: pointer;
  width: 44px; height: 44px;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.menu-toggle span {
  width: 24px; height: 3px; background: var(--navy);
  border-radius: 2px; transition: transform .3s, opacity .3s;
}
.menu-toggle.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.menu-toggle.open span:nth-child(2) { opacity: 0; }
.menu-toggle.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  color: #fff;
  background-color: var(--navy);
  overflow: hidden;
}
.hero-slides { position: absolute; inset: 0; }
.hero-slide {
  position: absolute;
  inset: 0;
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  opacity: 0;
  transition: opacity 1.2s ease;
}
.hero-slide.active { opacity: 1; }
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(10, 24, 40, 0.93) 30%, rgba(10, 24, 40, 0.55) 70%, rgba(10, 24, 40, 0.35));
  z-index: 1;
}
.hero-dots {
  position: absolute;
  left: 50%;
  bottom: 22px;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
  z-index: 3;
}
.hero-dot {
  width: 34px;
  height: 4px;
  border: none;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.35);
  cursor: pointer;
  padding: 0;
  transition: background .3s;
}
.hero-dot.active { background: var(--orange); }
.hero .container {
  position: relative;
  z-index: 2;
  padding-top: 110px;
  padding-bottom: 130px;
}
.hero .kicker {
  display: inline-block;
  background: rgba(245, 124, 0, 0.18);
  border: 1px solid rgba(245, 124, 0, 0.55);
  color: #ffb74d;
  font-size: 13px;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 6px 14px;
  border-radius: 999px;
  margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(30px, 4.5vw, 52px);
  line-height: 1.15;
  font-weight: 800;
  max-width: 720px;
  margin-bottom: 20px;
}
.hero h1 em { font-style: normal; color: #ffb74d; }
.hero p {
  font-size: clamp(15px, 1.6vw, 18px);
  color: #d5dee8;
  max-width: 640px;
  margin-bottom: 34px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 30px;
  border-radius: 6px;
  font-weight: 700;
  font-size: 15px;
  transition: background .2s, color .2s, transform .2s;
  cursor: pointer;
  border: none;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); color: #fff; }
.btn-outline { border: 2px solid rgba(255, 255, 255, 0.7); color: #fff; }
.btn-outline:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
.btn-blue { background: var(--blue); color: #fff; }
.btn-blue:hover { background: #0d47a1; color: #fff; }

/* ---------- Sections ---------- */
.section { padding: 80px 0; }
.section.alt { background: var(--gray-bg); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 48px; }
.section-head .eyebrow {
  color: var(--orange);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
}
.section-head h2 {
  font-size: clamp(24px, 3vw, 36px);
  color: var(--navy);
  margin: 10px 0 14px;
  line-height: 1.25;
}
.section-head p { color: var(--text-light); font-size: 15px; }

/* ---------- Stats ---------- */
.stats {
  background: var(--navy);
  color: #fff;
  padding: 54px 0;
}
.stats .container {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  text-align: center;
}
.stats .num {
  font-size: clamp(32px, 4vw, 46px);
  font-weight: 800;
  color: #ffb74d;
  line-height: 1.1;
}
.stats .num sup { font-size: 0.5em; }
.stats .label { font-size: 14px; color: #c3cedb; margin-top: 6px; }

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.about-media img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.about-media .exp-badge {
  position: relative;
  margin-top: -70px;
  margin-left: 30px;
  width: 180px;
  background: var(--orange);
  color: #fff;
  padding: 22px 18px;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
}
.exp-badge .big { font-size: 42px; font-weight: 800; line-height: 1; }
.exp-badge .small { font-size: 13px; margin-top: 4px; }
.about-text .eyebrow {
  color: var(--orange);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 3px;
  text-transform: uppercase;
}
.about-text h2 {
  font-size: clamp(24px, 3vw, 34px);
  color: var(--navy);
  margin: 10px 0 18px;
  line-height: 1.3;
}
.about-text p { color: var(--text-light); margin-bottom: 16px; font-size: 15px; }
.about-points { margin: 22px 0 30px; display: grid; gap: 12px; }
.about-points li {
  display: flex; gap: 10px; align-items: flex-start;
  font-size: 15px; font-weight: 600; color: var(--text);
}
.about-points li::before {
  content: "✓";
  flex: 0 0 auto;
  width: 22px; height: 22px;
  background: rgba(21, 101, 192, 0.12);
  color: var(--blue);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 800;
  margin-top: 3px;
}

/* ---------- Products ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform .25s, box-shadow .25s;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
  border-color: rgba(21, 101, 192, 0.35);
}
.product-card .thumb {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--gray-bg);
}
.product-card .thumb img {
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform .35s;
}
.product-card:hover .thumb img { transform: scale(1.05); }
.product-card .body { padding: 18px 18px 20px; flex: 1; display: flex; flex-direction: column; }
.product-card h3 { font-size: 16px; color: var(--navy); line-height: 1.4; margin-bottom: 8px; }
.product-card p { font-size: 13px; color: var(--text-light); flex: 1; }
.product-card .more {
  margin-top: 14px;
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
}
.product-card .more:hover { color: var(--orange); }

.view-more-wrap { text-align: center; margin-top: 44px; }

/* ---------- Why us ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.why-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 34px 26px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--blue);
}
.why-card .icon {
  width: 56px; height: 56px;
  border-radius: 12px;
  background: rgba(21, 101, 192, 0.1);
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  margin-bottom: 18px;
}
.why-card h3 { font-size: 17px; color: var(--navy); margin-bottom: 10px; }
.why-card p { font-size: 14px; color: var(--text-light); }

/* ---------- Timeline ---------- */
.timeline { position: relative; max-width: 760px; margin: 0 auto; }
.timeline::before {
  content: "";
  position: absolute;
  left: 110px; top: 0; bottom: 0;
  width: 3px;
  background: var(--gray-line);
}
.tl-item {
  position: relative;
  padding: 0 0 34px 160px;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-year {
  position: absolute;
  left: 0; top: 0;
  width: 90px;
  text-align: right;
  font-size: 20px;
  font-weight: 800;
  color: var(--orange);
}
.tl-item::before {
  content: "";
  position: absolute;
  left: 103px; top: 7px;
  width: 17px; height: 17px;
  border-radius: 50%;
  background: var(--blue);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--blue);
}
.tl-item p { font-size: 14px; color: var(--text-light); background: #fff; padding: 16px 20px; border-radius: var(--radius); box-shadow: var(--shadow); }

/* ---------- CTA banner ---------- */
.cta {
  background: linear-gradient(120deg, var(--navy) 0%, var(--navy-2) 60%, var(--blue) 130%);
  color: #fff;
  padding: 64px 0;
}
.cta .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  flex-wrap: wrap;
}
.cta h2 { font-size: clamp(22px, 3vw, 32px); margin-bottom: 8px; }
.cta p { color: #c3cedb; font-size: 15px; }

/* ---------- Contact page ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 48px;
  align-items: start;
}
.contact-info-card {
  background: var(--navy);
  color: #fff;
  border-radius: var(--radius);
  padding: 40px 34px;
}
.contact-info-card h3 { font-size: 22px; margin-bottom: 8px; }
.contact-info-card > p { color: #c3cedb; font-size: 14px; margin-bottom: 28px; }
.ci-row { display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.ci-row .ci-icon {
  flex: 0 0 auto;
  width: 42px; height: 42px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  display: flex; align-items: center; justify-content: center;
  font-size: 19px;
}
.ci-row .ci-label { font-size: 12px; color: #9fb0c3; text-transform: uppercase; letter-spacing: 1px; }
.ci-row .ci-value { font-size: 15px; font-weight: 600; word-break: break-word; }
.ci-row .ci-value a { color: #ffb74d; }

.form-card {
  background: #fff;
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  padding: 36px;
  box-shadow: var(--shadow);
}
.form-card h3 { color: var(--navy); font-size: 22px; margin-bottom: 6px; }
.form-card > p { color: var(--text-light); font-size: 14px; margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 6px;
}
.form-group label .req { color: var(--orange); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--gray-line);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: #fbfcfe;
  transition: border-color .2s, box-shadow .2s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.12);
}
.form-note { font-size: 12px; color: var(--text-light); margin-top: 12px; }
.form-status {
  display: none;
  margin-top: 14px;
  padding: 12px 16px;
  border-radius: 6px;
  font-size: 14px;
}
.form-status.ok { display: block; background: #e8f5e9; color: #2e7d32; }
.form-status.err { display: block; background: #ffebee; color: #c62828; }

/* ---------- Page banner (subpages) ---------- */
/* 【换图点：内页横幅背景图】把新图重命名为 banner-page.jpg 覆盖 images/ 里的同名文件即可 */
.page-banner {
  background:
    linear-gradient(100deg, rgba(10, 24, 40, 0.92), rgba(10, 24, 40, 0.7)),
    url('../images/banner-page.jpg') center/cover no-repeat;
  color: #fff;
  padding: 70px 0;
  text-align: center;
}
.page-banner h1 { font-size: clamp(28px, 4vw, 42px); font-weight: 800; }
.page-banner .crumb { font-size: 13px; color: #b7c4d4; margin-top: 10px; }
.page-banner .crumb a { color: #ffb74d; }

/* ---------- Product detail ---------- */
.pd-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.pd-gallery .main-img {
  border: 1px solid var(--gray-line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--gray-bg);
}
.pd-gallery .thumbs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 14px;
}
.pd-gallery .thumbs img {
  border: 1px solid var(--gray-line);
  border-radius: 8px;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  width: 100%;
}
.pd-info .cat {
  display: inline-block;
  background: rgba(21, 101, 192, 0.1);
  color: var(--blue);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 999px;
}
.pd-info h1 { font-size: clamp(24px, 3vw, 34px); color: var(--navy); margin: 14px 0 16px; line-height: 1.3; }
.pd-info .desc { color: var(--text-light); font-size: 15px; margin-bottom: 24px; }
.pd-features { margin-bottom: 28px; display: grid; gap: 10px; }
.pd-features li { display: flex; gap: 10px; font-size: 14px; align-items: flex-start; }
.pd-features li::before {
  content: "✓";
  color: var(--orange);
  font-weight: 800;
  margin-top: 0;
}
.pd-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.pd-phone {
  margin-top: 22px;
  font-size: 14px;
  color: var(--text-light);
}
.pd-phone strong { color: var(--navy); font-size: 18px; }

/* ---------- Back link ---------- */
.back-link { display: inline-block; margin-bottom: 26px; color: var(--blue); font-weight: 600; font-size: 14px; }
.back-link:hover { color: var(--orange); }

/* ---------- Footer ---------- */
.footer {
  background: var(--navy);
  color: #b7c4d4;
  padding: 64px 0 0;
  font-size: 14px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  padding-bottom: 48px;
}
.footer h4 {
  color: #fff;
  font-size: 16px;
  margin-bottom: 18px;
}
.footer .f-about p { margin: 14px 0; font-size: 13px; line-height: 1.8; }
.footer ul li { margin-bottom: 10px; }
.footer ul a:hover { color: #ffb74d; }
.footer .f-contact li { display: flex; gap: 10px; margin-bottom: 12px; align-items: flex-start; }
.footer .f-contact .fi { color: #ffb74d; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0;
  text-align: center;
  font-size: 13px;
  color: #8fa0b3;
}
.footer .logo-text .brand { color: #fff; }
.footer .logo-text .tagline { color: #8fa0b3; }

/* ---------- WhatsApp float ---------- */
.float-wa {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 200;
  width: 56px; height: 56px;
  border-radius: 50%;
  background: #25d366;
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 26px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
  transition: transform .2s;
}
.float-wa:hover { transform: scale(1.1); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .about-grid,
  .pd-grid,
  .contact-grid { grid-template-columns: 1fr; }
  .about-media { order: -1; }
  .stats .container { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: repeat(2, 1fr); }

  .menu-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 78px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: stretch;
    padding: 12px 20px 24px;
    gap: 2px;
    box-shadow: 0 16px 24px rgba(13, 33, 55, 0.12);
    transform: translateY(-130%);
    transition: transform .3s ease;
    z-index: -1;
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 13px 12px; border-bottom: 1px solid var(--gray-line); border-radius: 0; }
  .nav .btn-quote { margin: 12px 0 0; text-align: center; border-radius: 6px; border-bottom: none; }
  .topbar .container { justify-content: center; }
  .topbar .hide-sm { display: none; }
}

@media (max-width: 560px) {
  .section { padding: 56px 0; }
  .hero .container { padding-top: 76px; padding-bottom: 76px; }
  .product-grid { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .timeline::before { left: 16px; }
  .tl-item { padding: 0 0 26px 46px; }
  .tl-year { position: static; width: auto; text-align: left; margin-bottom: 8px; }
  .tl-item::before { left: 9px; top: 9px; }
  .cta .container { flex-direction: column; text-align: center; }
  .stats .container { grid-template-columns: repeat(2, 1fr); gap: 30px 12px; }
}