/* ==========================================================================
   Guangxi Hongzhitai — Industrial Theme (XCMG-inspired)
   Modular custom styles; Tailwind handles layout utilities.
   ========================================================================== */

:root {
  --hzt-primary: #003d7a;
  --hzt-primary-dark: #002a54;
  --hzt-accent: #f5a623;
  --hzt-accent-hover: #e09410;
  --hzt-dark: #0d1117;
  --hzt-gray-900: #1a1f26;
  --hzt-gray-700: #3d4550;
  --hzt-gray-500: #6b7280;
  --hzt-gray-100: #f3f4f6;
  --hzt-white: #ffffff;
  --hzt-header-height: 80px;
  --hzt-transition: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --hzt-shadow-card: 0 12px 40px rgba(0, 0, 0, 0.12);
  --hzt-shadow-header: 0 4px 24px rgba(0, 0, 0, 0.15);
}

/* Base ------------------------------------------------------------------- */
html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--hzt-gray-700);
  background: var(--hzt-white);
  overflow-x: hidden;
}

::selection {
  background: var(--hzt-primary);
  color: var(--hzt-white);
}

/* Typography ------------------------------------------------------------- */
.font-industrial {
  font-family: "Oswald", "Impact", sans-serif;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--hzt-accent);
  margin-bottom: 0.75rem;
}

.section-title {
  font-family: "Oswald", sans-serif;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--hzt-dark);
  line-height: 1.2;
}

/* Header ----------------------------------------------------------------- */
.site-header {
  height: var(--hzt-header-height);
  background: rgba(13, 17, 23, 0.92);
  backdrop-filter: blur(10px);
  transition: background var(--hzt-transition), box-shadow var(--hzt-transition);
}

.site-logo,
.brand-logo {
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.35));
}

/* Header brand: logo + HZT */
.brand-link {
  text-decoration: none;
}

.brand-name {
  color: #c4b5fd;
  font-family: "Montserrat", sans-serif;
  line-height: 1;
}

.brand-tagline {
  color: #d4af37;
  font-family: "Montserrat", sans-serif;
  line-height: 1.3;
  margin-top: 2px;
}

/* On dark scrolled header — keep legibility */
.site-header.is-scrolled .brand-name {
  color: #c4b5fd;
}

.site-header.is-scrolled .brand-tagline {
  color: #d4af37;
}

.site-logo-footer {
  max-height: 48px;
  width: auto;
  object-fit: contain;
}

.site-header.is-scrolled {
  background: rgba(13, 17, 23, 0.97) !important;
  backdrop-filter: blur(12px);
  box-shadow: var(--hzt-shadow-header);
}

section[id] {
  scroll-margin-top: var(--hzt-header-height);
}

.site-header .nav-link {
  position: relative;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: rgba(255, 255, 255, 0.88);
  transition: color var(--hzt-transition);
}

.site-header .nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--hzt-accent);
  transition: width var(--hzt-transition);
}

.site-header .nav-link:hover,
.site-header .nav-link.is-active {
  color: var(--hzt-white);
}

.site-header .nav-link:hover::after,
.site-header .nav-link.is-active::after {
  width: 100%;
}

/* Mobile menu */
.mobile-nav {
  transform: translateX(100%);
  transition: transform var(--hzt-transition);
}

.mobile-nav.is-open {
  transform: translateX(0);
}

.mobile-nav-overlay {
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--hzt-transition), visibility var(--hzt-transition);
}

.mobile-nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

/* Hero (XCMG ibanner / Swiper) ------------------------------------------- */
.hero-section {
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: var(--hzt-header-height);
}

.hero-swiper,
.hero-slide {
  min-height: calc(100vh - var(--hzt-header-height));
  min-height: calc(100dvh - var(--hzt-header-height));
}

.hero-slide {
  position: relative;
  display: flex;
  align-items: center;
}

.hero-media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  background: linear-gradient(
    105deg,
    rgba(0, 42, 84, 0.9) 0%,
    rgba(13, 17, 23, 0.72) 50%,
    rgba(13, 17, 23, 0.5) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 3rem 0 5rem;
  max-width: 52rem;
}

.hero-eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 1rem;
}

.hero-title {
  font-family: "Oswald", sans-serif;
  font-size: clamp(1.85rem, 5.5vw, 3.75rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--hzt-white);
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
}

.hero-sub {
  margin-top: 1.25rem;
  font-size: clamp(1rem, 2vw, 1.2rem);
  line-height: 1.65;
  color: rgba(255, 255, 255, 0.82);
  max-width: 40rem;
}

.hero-accent-line {
  width: 72px;
  height: 4px;
  background: var(--hzt-accent);
  margin-bottom: 1.25rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2rem;
}

.hero-pagination .swiper-pagination-bullet {
  background: rgba(255, 255, 255, 0.45);
  opacity: 1;
  width: 10px;
  height: 10px;
}

.hero-pagination .swiper-pagination-bullet-active {
  background: var(--hzt-accent);
  width: 28px;
  border-radius: 5px;
}

.hero-nav-prev,
.hero-nav-next {
  color: var(--hzt-white) !important;
}

.hero-nav-prev::after,
.hero-nav-next::after {
  font-size: 1.25rem !important;
}

/* Inquiry bar (XCMG ipart01) --------------------------------------------- */
.inquiry-bar {
  position: relative;
  z-index: 20;
  margin-top: -3rem;
  padding-bottom: 2rem;
}

.inquiry-bar-inner {
  background: var(--hzt-white);
  border-radius: 4px;
  box-shadow: var(--hzt-shadow-card);
  padding: 1.75rem 1.5rem;
  border-top: 4px solid var(--hzt-primary);
}

.inquiry-bar-title {
  font-size: 1.35rem;
  color: var(--hzt-dark);
  margin-bottom: 1.25rem;
}

.inquiry-form {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
}

.inquiry-field {
  flex: 1 1 140px;
  min-width: 120px;
}

.inquiry-field-grow {
  flex: 2 1 200px;
}

.inquiry-field label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hzt-gray-500);
  margin-bottom: 0.35rem;
}

.inquiry-field select,
.inquiry-field input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border: 1px solid #e5e7eb;
  font-size: 0.9rem;
  color: var(--hzt-dark);
  background: var(--hzt-white);
}

.inquiry-field select:focus,
.inquiry-field input:focus {
  outline: none;
  border-color: var(--hzt-primary);
}

.inquiry-submit {
  flex: 0 0 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--hzt-primary);
  color: var(--hzt-white);
  border: none;
  cursor: pointer;
  transition: background var(--hzt-transition);
}

.inquiry-submit:hover {
  background: var(--hzt-primary-dark);
}

/* Buttons ---------------------------------------------------------------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--hzt-dark);
  background: var(--hzt-accent);
  border: 2px solid var(--hzt-accent);
  transition: background var(--hzt-transition), color var(--hzt-transition),
    transform 0.2s ease;
}

.btn-primary:hover {
  background: var(--hzt-accent-hover);
  border-color: var(--hzt-accent-hover);
  transform: translateY(-2px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 1.75rem;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--hzt-white);
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.6);
  transition: border-color var(--hzt-transition), background var(--hzt-transition),
    transform 0.2s ease;
}

.btn-outline:hover {
  border-color: var(--hzt-white);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

.btn-card {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--hzt-primary);
  transition: gap var(--hzt-transition), color var(--hzt-transition);
}

.btn-card:hover {
  gap: 0.625rem;
  color: var(--hzt-accent-hover);
}

/* Product cards ---------------------------------------------------------- */
.product-card {
  background: var(--hzt-white);
  border: 1px solid #e5e7eb;
  overflow: hidden;
  transition: box-shadow var(--hzt-transition), transform var(--hzt-transition);
}

.product-card:hover {
  box-shadow: var(--hzt-shadow-card);
  transform: translateY(-6px);
}

.product-card .card-image-wrap {
  position: relative;
  overflow: hidden;
  aspect-ratio: 3 / 2;
}

.product-card .card-image-wrap img {
  transition: transform 0.6s ease;
}

.product-card:hover .card-image-wrap img {
  transform: scale(1.06);
}

.product-card .card-image-wrap::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 42, 84, 0.5), transparent 50%);
  opacity: 0;
  transition: opacity var(--hzt-transition);
}

.product-card:hover .card-image-wrap::after {
  opacity: 1;
}

.product-card .card-badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 0.35rem 0.65rem;
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--hzt-accent);
  color: var(--hzt-dark);
}

.product-card .card-category {
  position: absolute;
  bottom: 12px;
  left: 16px;
  z-index: 2;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--hzt-white);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--hzt-transition), transform var(--hzt-transition);
}

.product-card:hover .card-category {
  opacity: 1;
  transform: translateY(0);
}

/* Brand strip ------------------------------------------------------------ */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

@media (min-width: 768px) {
  .brand-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.brand-item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.brand-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.75;
  transition: opacity var(--hzt-transition), transform 0.5s ease;
}

.brand-item:hover img {
  opacity: 1;
  transform: scale(1.05);
}

.brand-item span {
  position: absolute;
  inset: auto 0 0 0;
  padding: 0.5rem;
  text-align: center;
  font-family: "Oswald", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--hzt-white);
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.75));
}

/* Service cards ---------------------------------------------------------- */
.service-card {
  padding: 2rem 1.75rem;
  background: var(--hzt-gray-100);
  border-top: 3px solid var(--hzt-primary);
  transition: box-shadow var(--hzt-transition), transform var(--hzt-transition);
}

.service-card:hover {
  box-shadow: var(--hzt-shadow-card);
  transform: translateY(-4px);
}

.service-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--hzt-primary);
  color: var(--hzt-accent);
  font-size: 1.35rem;
  margin-bottom: 1.25rem;
}

/* Gallery & video -------------------------------------------------------- */
.media-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
}

@media (min-width: 640px) {
  .media-gallery {
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
  }
}

@media (min-width: 1024px) {
  .media-gallery {
    grid-template-columns: repeat(4, 1fr);
  }
}

.gallery-item {
  display: block;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--hzt-gray-100);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.08);
}

.video-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .video-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.video-grid-embed {
  justify-items: center;
}

@media (min-width: 768px) {
  .video-grid-embed {
    grid-template-columns: 1fr;
  }
}

.video-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
}

.video-card video {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background: #000;
}

.video-card-youtube {
  width: 100%;
  max-width: 360px;
  opacity: 1;
  transform: none;
}

.yt-poster {
  position: relative;
  display: block;
  width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  cursor: pointer;
  background: #111;
  aspect-ratio: 9 / 16;
  overflow: hidden;
}

.yt-poster img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.yt-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  font-size: 2.25rem;
  transition: background 0.2s ease, transform 0.2s ease;
}

.yt-poster:hover .yt-play {
  background: rgba(0, 0, 0, 0.2);
  transform: scale(1.05);
}

.yt-frame-wrap,
.video-card-youtube iframe {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 16;
  min-height: 520px;
  border: 0;
  background: #000;
}

.video-card-youtube iframe {
  height: 100%;
  min-height: 520px;
}

.video-card-label {
  padding: 0.75rem 1rem;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
}

.video-card-label a {
  color: rgba(255, 255, 255, 0.85);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.video-card-label a:hover {
  color: var(--hzt-accent);
}

/* CTA band --------------------------------------------------------------- */
.cta-band {
  padding: 4rem 0;
  background: linear-gradient(90deg, var(--hzt-primary-dark), var(--hzt-primary));
}

.cta-band-title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--hzt-white);
  max-width: 48rem;
  margin: 0 auto;
  line-height: 1.2;
}

.cta-band-text {
  margin-top: 1rem;
  color: rgba(255, 255, 255, 0.75);
  font-size: 1rem;
}

/* Footer extras ---------------------------------------------------------- */
.footer-heading {
  font-family: "Oswald", sans-serif;
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--hzt-white);
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 0.5rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.6);
  transition: color var(--hzt-transition);
}

.form-label {
  display: block;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.75);
  margin-bottom: 0.35rem;
}

/* Advantage cards -------------------------------------------------------- */
.advantage-card {
  position: relative;
  padding: 2.5rem 2rem;
  background: var(--hzt-white);
  border: 1px solid #e5e7eb;
  transition: border-color var(--hzt-transition), box-shadow var(--hzt-transition);
}

.advantage-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: var(--hzt-accent);
  transition: height var(--hzt-transition);
}

.advantage-card:hover {
  border-color: transparent;
  box-shadow: var(--hzt-shadow-card);
}

.advantage-card:hover::before {
  height: 100%;
}

.advantage-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--hzt-primary) 0%, var(--hzt-primary-dark) 100%);
  color: var(--hzt-accent);
  font-size: 1.5rem;
}

/* Stats bar -------------------------------------------------------------- */
.stats-bar {
  background: linear-gradient(90deg, var(--hzt-primary-dark), var(--hzt-primary));
}

.stat-number {
  font-family: "Oswald", sans-serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--hzt-accent);
  line-height: 1;
}

/* About / Stories -------------------------------------------------------- */
.about-image-frame {
  position: relative;
}

.about-image-frame::before {
  content: "";
  position: absolute;
  top: -16px;
  left: -16px;
  width: 40%;
  height: 40%;
  border: 3px solid var(--hzt-accent);
  z-index: 0;
}

.story-card {
  border-left: 3px solid var(--hzt-accent);
  padding-left: 1.5rem;
  transition: padding-left var(--hzt-transition);
}

.story-card:hover {
  padding-left: 1.75rem;
}

/* Contact ---------------------------------------------------------------- */
.contact-panel {
  background: linear-gradient(135deg, var(--hzt-gray-900) 0%, var(--hzt-dark) 100%);
}

.form-input {
  width: 100%;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--hzt-white);
  font-size: 0.9375rem;
  transition: border-color var(--hzt-transition), background var(--hzt-transition);
}

.form-input::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.form-input:focus {
  outline: none;
  border-color: var(--hzt-accent);
  background: rgba(255, 255, 255, 0.1);
}

/* Footer ----------------------------------------------------------------- */
.site-footer {
  background: var(--hzt-dark);
  color: rgba(255, 255, 255, 0.65);
}

.site-footer a:hover {
  color: var(--hzt-accent);
}

/* AI Chatbot ------------------------------------------------------------- */
.tbot-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 9990;
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--hzt-primary), var(--hzt-primary-dark));
  color: var(--hzt-white);
  font-size: 1.5rem;
  box-shadow: 0 8px 32px rgba(0, 61, 122, 0.45);
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  border: none;
}

.tbot-fab:hover {
  transform: scale(1.08);
  box-shadow: 0 12px 40px rgba(0, 61, 122, 0.55);
}

.tbot-fab.is-active {
  background: var(--hzt-gray-700);
}

.tbot-chat-wrapper {
  position: fixed;
  right: 24px;
  bottom: 96px;
  z-index: 9989;
  width: min(380px, calc(100vw - 48px));
  max-height: min(520px, calc(100vh - 120px));
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.96);
  transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.tbot-chat-wrapper.is-open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

#tbot-chat-container {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 400px;
  background: var(--hzt-white);
  border-radius: 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  overflow: hidden;
  border: 1px solid #e5e7eb;
}

.tbot-chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  background: linear-gradient(90deg, var(--hzt-primary-dark), var(--hzt-primary));
  color: var(--hzt-white);
}

.tbot-chat-body {
  flex: 1;
  padding: 1.25rem;
  overflow-y: auto;
  background: #f9fafb;
}

.tbot-chat-placeholder {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--hzt-gray-500);
  font-size: 0.875rem;
  line-height: 1.6;
}

.tbot-chat-placeholder i {
  font-size: 2.5rem;
  color: var(--hzt-primary);
  margin-bottom: 1rem;
  display: block;
}

/* Scroll reveal (JS toggles .is-visible) ---------------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* Utility ---------------------------------------------------------------- */
.diagonal-bg {
  background: linear-gradient(
    165deg,
    var(--hzt-gray-100) 0%,
    var(--hzt-white) 40%,
    var(--hzt-gray-100) 100%
  );
}