/*
Theme Name: NTM Engineering
Theme URI: https://ntm-engineering.org
Author: NTM Engineering
Description: Custom theme for NTM Engineering — Automotive Engineering Partner Beijing
Version: 2.0.0
License: Proprietary
Text Domain: ntm-engineering
*/


:root {
  --navy:        #183667;
  --navy-light:  #1e4282;
  --navy-dark:   #0f2244;
  --accent:      #C0272D;
  --accent-dark: #9b1f23;
  --white:       #FFFFFF;
  --gray-50:     #F9FAFB;
  --gray-100:    #F3F4F6;
  --gray-200:    #E5E7EB;
  --gray-400:    #9CA3AF;
  --gray-600:    #6B7280;
  --gray-800:    #1F2937;
  --text:        #111827;
  --radius:      6px;
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.08);
  --shadow:      0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg:   0 12px 40px rgba(0,0,0,0.15);
  --transition:  0.22s ease;
  --nav-height:  72px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  z-index: 1000;
  transition: box-shadow var(--transition);
}
.nav.scrolled { box-shadow: var(--shadow); }
.nav__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.nav__logo {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  flex-shrink: 0;
}
.nav__logo-ntm {
  font-family: 'Inter', sans-serif;
  font-weight: 900;
  font-size: 1.6rem;
  letter-spacing: 0.08em;
  color: var(--navy);
  line-height: 1;
}
.nav__logo-sub {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--gray-600);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.nav__links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav__link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover,
.nav__link.active { color: var(--navy); background: var(--gray-100); }
.nav__link.active { font-weight: 600; }
.nav__right {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-shrink: 0;
}
.lang-switcher {
  display: flex;
  align-items: center;
  background: var(--gray-100);
  border-radius: 20px;
  padding: 2px;
}
.lang-btn {
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 16px;
  border: none;
  cursor: pointer;
  background: transparent;
  color: rgba(255,255,255,0.55);
  transition: all var(--transition);
  letter-spacing: 0.03em;
  text-decoration: none;
}
.lang-btn:hover { color: rgba(255,255,255,0.9); }
.lang-btn.active {
  background: var(--white);
  color: var(--navy);
}
.nav__cta {
  font-size: 0.875rem;
  font-weight: 600;
  background: var(--accent);
  color: var(--white);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition);
}
.nav__cta:hover { background: var(--accent-dark); transform: translateY(-1px); }
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.nav__hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--navy);
  transition: all var(--transition);
}
.nav__mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0; right: 0;
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 1rem 1.5rem 1.5rem;
  box-shadow: var(--shadow);
  z-index: 999;
  flex-direction: column;
  gap: 0.5rem;
}
.nav__mobile.open { display: flex; }
.nav__mobile .nav__link { font-size: 1rem; padding: 0.75rem 0.5rem; }
.nav__mobile .lang-switcher { align-self: flex-start; margin-top: 0.5rem; }
.nav__mobile .nav__cta { align-self: flex-start; margin-top: 0.5rem; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.75);
  padding: 3rem 0 2rem;
}
.footer__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
}
.footer__brand .nav__logo-ntm { color: var(--white); font-size: 1.4rem; }
.footer__brand .nav__logo-sub { color: rgba(255,255,255,0.5); }
.footer__desc {
  font-size: 0.85rem;
  line-height: 1.7;
  margin-top: 0.75rem;
  color: rgba(255,255,255,0.6);
}
.footer__heading {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 0.75rem;
}
.footer__links li { margin-bottom: 0.4rem; }
.footer__links a {
  font-size: 0.875rem;
  color: rgba(255,255,255,0.65);
  transition: color var(--transition);
}
.footer__links a:hover { color: var(--white); }
.footer__bottom {
  max-width: 1200px;
  margin: 2rem auto 0;
  padding: 1.25rem 2rem 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
}
.footer__bottom a { color: rgba(255,255,255,0.5); }
.footer__bottom a:hover { color: var(--white); }
.footer__social {
  display: flex;
  gap: 0.65rem;
  margin-top: 1.25rem;
}
.footer__social-link {
  width: 36px;
  height: 36px;
  background: rgba(255,255,255,0.1);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}
.footer__social-link:hover { background: rgba(255,255,255,0.22); }
.footer__social-link svg { width: 17px; height: 17px; fill: rgba(255,255,255,0.8); }

/* ============================================================
   LAYOUT UTILITIES
   ============================================================ */
.container { max-width: 1200px; margin: 0 auto; padding: 0 2rem; }
.section { padding: 6rem 0; }
.section--gray { background: var(--gray-50); }
.section--navy { background: var(--navy); color: var(--white); }
.section--navy-dark { background: var(--navy-dark); color: var(--white); }

.page-header {
  background: var(--navy);
  color: var(--white);
  padding: calc(var(--nav-height) + 4rem) 0 4rem;
  position: relative;
  overflow: hidden;
}
.page-header::after {
  content: attr(data-watermark);
  position: absolute;
  right: -2rem; bottom: -3rem;
  font-size: 12rem;
  font-weight: 900;
  color: rgba(255,255,255,0.04);
  letter-spacing: 0.1em;
  pointer-events: none;
  line-height: 1;
  font-family: 'Inter', sans-serif;
}
.page-header__eyebrow {
  font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.75rem;
}
.page-header__title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900; line-height: 1.1; letter-spacing: -0.02em;
}
.page-header__subtitle {
  font-size: 1.1rem; color: rgba(255,255,255,0.7);
  margin-top: 1rem; max-width: 600px;
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
.section-eyebrow {
  font-size: 0.75rem; font-weight: 700;
  letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 0.5rem;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 800; line-height: 1.2;
  letter-spacing: -0.02em; color: var(--navy);
}
.section-title--white { color: var(--white); }
.section-subtitle {
  font-size: 1.05rem; color: var(--gray-600);
  margin-top: 0.75rem; max-width: 600px; line-height: 1.7;
}
.section-subtitle--white { color: rgba(255,255,255,0.72); }
.highlight { color: var(--accent); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.9rem; font-weight: 600;
  padding: 0.75rem 1.75rem; border-radius: var(--radius);
  border: none; cursor: pointer;
  transition: all var(--transition); letter-spacing: 0.01em;
}
.btn--primary { background: var(--accent); color: var(--white); }
.btn--primary:hover { background: var(--accent-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(192,39,45,0.35); }
.btn--navy { background: var(--navy); color: var(--white); }
.btn--navy:hover { background: var(--navy-light); transform: translateY(-2px); }
.btn--outline { background: transparent; color: var(--white); border: 2px solid rgba(255,255,255,0.5); }
.btn--outline:hover { border-color: var(--white); background: rgba(255,255,255,0.1); }
.btn--outline-navy { background: transparent; color: var(--navy); border: 2px solid var(--navy); }
.btn--outline-navy:hover { background: var(--navy); color: var(--white); }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--white); border: 1px solid var(--gray-200);
  border-radius: 10px; padding: 2rem;
  transition: box-shadow var(--transition), transform var(--transition);
}
.card:hover { box-shadow: var(--shadow); transform: translateY(-3px); }
.card--navy { background: var(--navy); color: var(--white); border-color: transparent; }

/* ============================================================
   STATS
   ============================================================ */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; }
.stat-item { text-align: center; padding: 2rem 1rem; background: var(--white); }
.stat-item--navy { background: rgba(255,255,255,0.06); }
.stat-number { font-size: 2.8rem; font-weight: 900; line-height: 1; color: var(--navy); letter-spacing: -0.03em; }
.stat-number--white { color: var(--white); }
.stat-number--accent { color: var(--accent); }
.stat-suffix { font-size: 1.4rem; font-weight: 700; color: var(--accent); }
.stat-label { font-size: 0.8rem; font-weight: 500; color: var(--gray-600); margin-top: 0.35rem; letter-spacing: 0.04em; text-transform: uppercase; }
.stat-label--white { color: rgba(255,255,255,0.6); }

/* ============================================================
   GRIDS
   ============================================================ */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* ============================================================
   ICON CIRCLE
   ============================================================ */
.icon-circle {
  width: 48px; height: 48px; border-radius: 50%;
  background: var(--navy); display: flex;
  align-items: center; justify-content: center; flex-shrink: 0;
}
.icon-circle--accent { background: var(--accent); }
.icon-circle--light { background: var(--gray-100); }
.icon-circle svg { width: 22px; height: 22px; }

/* ============================================================
   DIVIDER
   ============================================================ */
.divider { width: 48px; height: 3px; background: var(--accent); border-radius: 2px; margin: 1rem 0; }
.divider--center { margin-left: auto; margin-right: auto; }

/* ============================================================
   BADGE
   ============================================================ */
.badge {
  display: inline-flex; align-items: center;
  font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.3rem 0.75rem; border-radius: 20px;
}
.badge--navy { background: rgba(24,54,103,0.1); color: var(--navy); }
.badge--accent { background: rgba(192,39,45,0.1); color: var(--accent); }
.badge--white { background: rgba(255,255,255,0.15); color: var(--white); }

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta-section { background: var(--navy); color: var(--white); padding: 5rem 0; text-align: center; }
.cta-section__title { font-size: clamp(1.8rem, 3.5vw, 2.6rem); font-weight: 900; letter-spacing: -0.02em; line-height: 1.2; }
.cta-section__sub { font-size: 1.05rem; color: rgba(255,255,255,0.7); margin-top: 0.75rem; margin-bottom: 2rem; }
.cta-section__btns { display: flex; align-items: center; justify-content: center; gap: 1rem; flex-wrap: wrap; }

/* ============================================================
   QUOTE BLOCK
   ============================================================ */
.quote-block { border-left: 4px solid var(--accent); padding: 1.5rem 2rem; background: var(--gray-50); border-radius: 0 var(--radius) var(--radius) 0; }
.quote-block__text { font-size: 1.1rem; font-style: italic; line-height: 1.7; color: var(--gray-800); }
.quote-block__author { margin-top: 0.75rem; font-size: 0.875rem; font-weight: 600; color: var(--navy); }

/* ============================================================
   OEM LOGOS STRIP
   ============================================================ */
.oem-strip { background: var(--gray-50); border-top: 1px solid var(--gray-200); border-bottom: 1px solid var(--gray-200); padding: 1.5rem 0; }
.oem-strip__label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.15em; text-transform: uppercase; color: var(--gray-400); text-align: center; margin-bottom: 1.25rem; }
.oem-strip__logos { display: flex; align-items: center; justify-content: center; gap: 2.5rem; flex-wrap: wrap; }
.oem-logo { font-size: 0.875rem; font-weight: 700; color: var(--gray-600); letter-spacing: 0.05em; opacity: 0.7; transition: opacity var(--transition); text-transform: uppercase; }
.oem-logo:hover { opacity: 1; }

/* ============================================================
   IMAGE BANNER
   ============================================================ */
.img-banner { position: relative; height: 320px; overflow: hidden; }
.img-banner img { width: 100%; height: 100%; object-fit: cover; object-position: center 60%; display: block; }
.img-banner__overlay {
  position: absolute; inset: 0;
  background: linear-gradient(to right, rgba(24,54,103,0.88) 0%, rgba(24,54,103,0.55) 60%, rgba(24,54,103,0.25) 100%);
  display: flex; align-items: center; justify-content: center; padding: 0;
}
.img-banner__content { max-width: 1200px; width: 100%; padding: 0 3rem; }
.img-banner__label { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.2em; text-transform: uppercase; color: rgba(255,255,255,0.55); margin-bottom: 0.75rem; }
.img-banner__title { font-size: clamp(1.4rem, 2.5vw, 2rem); font-weight: 800; color: var(--white); line-height: 1.25; margin-bottom: 0.75rem; }
.img-banner__title em { color: var(--accent); font-style: normal; }
.img-banner__sub { font-size: 0.9rem; color: rgba(255,255,255,0.7); line-height: 1.6; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 960px) {
  .nav__links { display: none; }
  .nav__right .nav__cta { display: none; }
  .nav__hamburger { display: flex; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 900px) {
  .img-banner { height: 240px; }
  .img-banner__content { padding: 0 1.5rem; }
}
@media (max-width: 640px) {
  .section { padding: 4rem 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr; gap: 2rem; }
  .cta-section__btns { flex-direction: column; align-items: center; }
  .container { padding: 0 1.25rem; }
}
@media (max-width: 600px) {
  .img-banner { height: 200px; }
}

/* ============================================================
   ANIMATION
   ============================================================ */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeInUp 0.6s ease both; }
.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }

/* ============================================================
   ACCESSIBILITY
   ============================================================ */
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; border-radius: 2px; }