/* ===== LANG TOGGLE ===== */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: .25rem;
  margin-left: .75rem;
}
.lang-toggle__sep {
  color: rgba(255,255,255,.35);
  font-size: .75rem;
  line-height: 1;
  transition: color var(--transition);
}
.header.scrolled .lang-toggle__sep { color: rgba(0,0,0,.25); }

.lang-toggle__btn {
  padding: .3rem .7rem;
  border-radius: 100px;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .05em;
  color: rgba(255,255,255,.55);
  border: 1.5px solid transparent;
  background: transparent;
  transition: all var(--transition);
  cursor: pointer;
  font-family: var(--font-sans);
}
.lang-toggle__btn:hover {
  color: rgba(255,255,255,.9);
  border-color: rgba(255,255,255,.3);
}
.lang-toggle__btn.active {
  color: var(--gold);
  border-color: rgba(212,175,55,.5);
  background: rgba(212,175,55,.08);
}
.header.scrolled .lang-toggle__btn { color: var(--text-muted); }
.header.scrolled .lang-toggle__btn:hover { color: var(--red); border-color: rgba(139,26,26,.3); }
.header.scrolled .lang-toggle__btn.active { color: var(--red); border-color: rgba(139,26,26,.4); background: rgba(139,26,26,.06); }

@media (max-width: 768px) {
  .lang-toggle { order: -1; margin-left: 0; margin-right: auto; }
  .header__inner { flex-wrap: nowrap; }
}

/* ===== CSS RESET & VARIABLES ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --red:       #8B1A1A;
  --red-dark:  #6B1313;
  --red-light: #B22222;
  --gold:      #D4AF37;
  --gold-light:#F0D060;
  --dark:      #1A1A2E;
  --text:      #2D3748;
  --text-muted:#718096;
  --bg:        #FFFFFF;
  --bg-light:  #F8F5F0;
  --border:    #E2D9D0;

  --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', system-ui, sans-serif;
  --container: 1200px;
  --radius:    8px;
  --shadow-sm: 0 2px 8px rgba(0,0,0,.08);
  --shadow-md: 0 4px 20px rgba(0,0,0,.12);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.16);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-sans); color: var(--text); background: var(--bg); line-height: 1.6; overflow-x: hidden; }
img, svg { max-width: 100%; display: block; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== TYPOGRAPHY ===== */
.section-label {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .15em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: .75rem;
}
.section-title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--dark);
  margin-bottom: 1rem;
}
.section-desc {
  font-size: 1rem;
  color: var(--text-muted);
  max-width: 600px;
}
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header .section-desc { margin: 0 auto; }
.section-header--light .section-title,
.section-header--light .section-desc { color: rgba(255,255,255,.9); }
.section-header--light .section-desc { color: rgba(255,255,255,.7); }

/* ===== SECTIONS ===== */
.section { padding: 90px 0; }
.bg-light { background: var(--bg-light); }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 1.75rem;
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 600;
  letter-spacing: .03em;
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}
.btn--primary {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}
.btn--primary:hover {
  background: var(--red-dark);
  border-color: var(--red-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139,26,26,.3);
}
.btn--outline {
  background: transparent;
  color: #fff;
  border-color: rgba(255,255,255,.6);
}
.btn--outline:hover {
  background: rgba(255,255,255,.15);
  border-color: #fff;
}
.btn--outline-dark {
  background: transparent;
  color: var(--red);
  border-color: var(--red);
}
.btn--outline-dark:hover {
  background: var(--red);
  color: #fff;
  transform: translateY(-2px);
}
.btn--sm { padding: .5rem 1.25rem; font-size: .8rem; }
.btn--full { width: 100%; justify-content: center; }
.section-footer { text-align: center; margin-top: 2.5rem; }

/* ===== HEADER ===== */
.header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 0;
  transition: all var(--transition);
  background: transparent;
}
.header.scrolled {
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-sm);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.header__logo {
  display: flex;
  align-items: center;
  gap: .75rem;
}
.logo-mark svg { width: 40px; height: 40px; }
.logo-text { display: flex; flex-direction: column; line-height: 1; }
.logo-cn {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: .05em;
  transition: color var(--transition);
}
.logo-en {
  font-size: .55rem;
  font-weight: 500;
  color: rgba(255,255,255,.7);
  letter-spacing: .15em;
  transition: color var(--transition);
}
.header.scrolled .logo-cn { color: var(--dark); }
.header.scrolled .logo-en { color: var(--text-muted); }

.nav__list {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.nav__link {
  padding: .5rem .875rem;
  border-radius: var(--radius);
  font-size: .875rem;
  font-weight: 500;
  color: rgba(255,255,255,.9);
  transition: all var(--transition);
  position: relative;
}
.nav__link:hover { color: #fff; background: rgba(255,255,255,.12); }
.nav__link--cta {
  background: var(--red);
  color: #fff;
  padding: .5rem 1.25rem;
}
.nav__link--cta:hover { background: var(--red-dark); }
.header.scrolled .nav__link { color: var(--text); }
.header.scrolled .nav__link:hover { color: var(--red); background: rgba(139,26,26,.06); }
.header.scrolled .nav__link--cta { color: #fff; }
.header.scrolled .nav__link--cta:hover { background: var(--red-dark); color: #fff; }

.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}
.header.scrolled .menu-toggle span { background: var(--dark); }

/* ===== HERO ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
}
.hero__slider { position: relative; width: 100%; height: 100%; }
.hero__slide {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .8s ease;
}
.hero__slide.active { opacity: 1; z-index: 1; pointer-events: auto; }

.hero__slide--1 { background: linear-gradient(135deg, #1A0505 0%, #8B1A1A 50%, #2D1010 100%); }
.hero__slide--2 { background: linear-gradient(135deg, #0A0A1A 0%, #1A1A4E 50%, #2A1A5A 100%); }
.hero__slide--3 { background: linear-gradient(135deg, #0A1A0A 0%, #1A3A2A 50%, #0A2A1A 100%); }

.hero__pattern {
  position: absolute;
  inset: 0;
  opacity: .06;
  background-image:
    repeating-linear-gradient(45deg, #D4AF37 0, #D4AF37 1px, transparent 0, transparent 50%),
    repeating-linear-gradient(-45deg, #D4AF37 0, #D4AF37 1px, transparent 0, transparent 50%);
  background-size: 40px 40px;
}

.hero__content {
  position: relative;
  z-index: 2;
  padding-top: 80px;
  animation: heroFadeIn .8s ease forwards;
}
@keyframes heroFadeIn {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero__slide:not(.active) .hero__content { animation: none; }

.hero__tag {
  display: inline-block;
  padding: .35rem 1rem;
  border: 1px solid rgba(212,175,55,.5);
  border-radius: 100px;
  font-size: .8rem;
  letter-spacing: .1em;
  color: var(--gold);
  margin-bottom: 1.5rem;
}
.hero__title {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.1;
  margin-bottom: 1.25rem;
}
.hero__title em {
  font-style: normal;
  color: var(--gold);
}
.hero__desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,.75);
  max-width: 540px;
  margin-bottom: 2rem;
  line-height: 1.7;
}
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero__controls {
  position: absolute;
  bottom: 130px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: .75rem;
  z-index: 10;
}
.hero__dot {
  width: 8px;
  height: 8px;
  border-radius: 100px;
  background: rgba(255,255,255,.4);
  transition: all var(--transition);
}
.hero__dot.active {
  background: var(--gold);
  width: 28px;
}

.hero__stats {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 10;
  background: rgba(0,0,0,.4);
  backdrop-filter: blur(8px);
  border-top: 1px solid rgba(212,175,55,.2);
}
.stats-bar {
  display: flex;
  justify-content: space-around;
  padding: 1.25rem 0;
}
.stat-item {
  text-align: center;
  color: #fff;
}
.stat-num {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  color: var(--gold);
  line-height: 1;
}
.stat-unit {
  font-size: .875rem;
  color: rgba(255,255,255,.7);
  font-weight: 600;
}
.stat-label {
  display: block;
  font-size: .75rem;
  color: rgba(255,255,255,.6);
  margin-top: .25rem;
  letter-spacing: .05em;
}

/* ===== ABOUT ===== */
.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}
.about__img-wrap {
  position: relative;
}
.carpet-illustration { border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-lg); }
.carpet-illustration.large svg { width: 100%; height: auto; }

.about__badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--red);
  color: #fff;
  width: 100px;
  height: 100px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  border: 4px solid #fff;
}
.badge-year { font-size: 1.3rem; font-weight: 800; line-height: 1; }
.badge-text { font-size: .65rem; opacity: .9; text-align: center; }

.about__lead {
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--dark);
  margin-bottom: 1rem;
  line-height: 1.7;
}
.about__text {
  font-size: .95rem;
  color: var(--text-muted);
  margin-bottom: .875rem;
  line-height: 1.75;
}
.about__certs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .75rem;
  margin: 1.75rem 0;
}
.cert-item {
  display: flex;
  align-items: center;
  gap: .625rem;
  font-size: .875rem;
  color: var(--text);
  font-weight: 500;
}
.cert-icon svg { width: 20px; height: 20px; flex-shrink: 0; }

/* ===== PRODUCTS ===== */
.product-tabs {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  justify-content: center;
}
.tab-btn {
  padding: .5rem 1.25rem;
  border-radius: 100px;
  font-size: .875rem;
  font-weight: 500;
  color: var(--text-muted);
  border: 1.5px solid var(--border);
  background: #fff;
  transition: all var(--transition);
}
.tab-btn.active,
.tab-btn:hover {
  background: var(--red);
  color: #fff;
  border-color: var(--red);
}

.products-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.product-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.product-card.hidden { display: none; }
.product-card__img {
  position: relative;
  height: 200px;
  overflow: hidden;
}
.product-card__img:hover .product-card__overlay { opacity: 1; pointer-events: auto; }
.product-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,.4);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

/* Carpet swatches - CSS art */
.carpet-swatch {
  width: 100%;
  height: 100%;
  background-color: var(--c1);
  position: relative;
  overflow: hidden;
}
.carpet-swatch::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 20px, rgba(255,255,255,.05) 20px, rgba(255,255,255,.05) 21px),
    repeating-linear-gradient(90deg, transparent, transparent 20px, rgba(255,255,255,.05) 20px, rgba(255,255,255,.05) 21px);
}
.carpet-swatch::after {
  content: '';
  position: absolute;
  inset: 20%;
  border: 3px solid var(--c2);
  border-radius: 50%;
  opacity: .5;
}
.carpet-swatch[style*="--pattern:1"]::after { border-radius: 0; transform: rotate(45deg); }
.carpet-swatch[style*="--pattern:2"]::after { border-radius: 0; }
.carpet-swatch[style*="--pattern:3"]::after { border-radius: 50%; }
.carpet-swatch[style*="--pattern:4"]::after { clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%); }
.carpet-swatch[style*="--pattern:5"]::after { clip-path: polygon(50% 0%, 61% 35%, 98% 35%, 68% 57%, 79% 91%, 50% 70%, 21% 91%, 32% 57%, 2% 35%, 39% 35%); }
.carpet-swatch--custom::before {
  background-image: repeating-linear-gradient(45deg, transparent, transparent 15px, rgba(212,175,55,.15) 15px, rgba(212,175,55,.15) 16px);
}

.product-card__info { padding: 1.25rem; }
.product-tag {
  display: inline-block;
  padding: .2rem .6rem;
  background: rgba(139,26,26,.08);
  color: var(--red);
  font-size: .7rem;
  font-weight: 600;
  background: #000;
  letter-spacing: .05em;
  margin-bottom: .5rem;
}
.product-card__info h3 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: .4rem;
}
.product-card__info p {
  font-size: .825rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: .75rem;
}
.product-specs {
  display: flex;
  gap: 1rem;
  font-size: .75rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: .75rem;
}
.product-specs span::before { content: '• '; color: var(--gold); }

/* ===== ADVANTAGES ===== */
.advantages {
  background: var(--dark);
  color: #fff;
}
.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}
.adv-card {
  padding: 2rem;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: var(--radius);
  background: rgba(255,255,255,.03);
  transition: all var(--transition);
}
.adv-card:hover {
  background: rgba(255,255,255,.07);
  border-color: rgba(212,175,55,.3);
  transform: translateY(-4px);
}
.adv-card__icon {
  width: 64px;
  height: 64px;
  margin-bottom: 1.25rem;
}
.adv-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: .625rem;
}
.adv-card p {
  font-size: .875rem;
  color: rgba(255,255,255,.6);
  line-height: 1.75;
}

/* ===== PROCESS ===== */
.process-flow {
  display: flex;
  align-items: flex-start;
  gap: 0;
  overflow-x: auto;
  padding-bottom: 1rem;
}
.process-step {
  flex: 1;
  min-width: 140px;
  text-align: center;
  padding: 1.5rem 1rem;
  position: relative;
}
.process-step__num {
  font-size: .75rem;
  font-weight: 800;
  color: var(--gold);
  letter-spacing: .05em;
  margin-bottom: .75rem;
}
.process-step__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto .875rem;
  background: rgba(139,26,26,.08);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
}
.process-step h4 {
  font-size: .9rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: .5rem;
}
.process-step p {
  font-size: .8rem;
  color: var(--text-muted);
  line-height: 1.6;
}
.process-arrow {
  flex-shrink: 0;
  font-size: 1.25rem;
  color: var(--gold);
  padding-top: 3.5rem;
  opacity: .6;
}

/* ===== CASES ===== */
.cases { background: var(--dark); }
.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  grid-template-rows: repeat(2, 200px);
  gap: 1rem;
  margin-bottom: 3rem;
}
.case-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
}
.case-card--large { grid-row: 1 / 3; }
.case-card__bg {
  position: absolute;
  inset: 0;
  transition: transform .5s ease;
}
.case-card:hover .case-card__bg { transform: scale(1.05); }
.case-bg--1 { background: linear-gradient(135deg, #6B1313, #8B1A1A, #B22222); }
.case-bg--2 { background: linear-gradient(135deg, #1A2A4A, #2C5282, #3A6BAA); }
.case-bg--3 { background: linear-gradient(135deg, #1A3A2A, #276749, #38A169); }
.case-bg--4 { background: linear-gradient(135deg, #3A2A1A, #744210, #A05A1A); }

.case-bg--1::before, .case-bg--2::before, .case-bg--3::before, .case-bg--4::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(45deg, rgba(255,255,255,.03) 0, rgba(255,255,255,.03) 1px, transparent 0, transparent 50%);
  background-size: 20px 20px;
}

.case-card__content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1.5rem;
  background: linear-gradient(to top, rgba(0,0,0,.75), transparent);
  color: #fff;
}
.case-tag {
  display: inline-block;
  padding: .2rem .6rem;
  background: rgba(212,175,55,.2);
  border: 1px solid rgba(212,175,55,.4);
  color: var(--gold);
  font-size: .7rem;
  background: #000;
  margin-bottom: .5rem;
  font-weight: 600;
}
.case-card__content h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: .375rem;
}
.case-card__content p { font-size: .8rem; opacity: .8; line-height: 1.5; margin-bottom: .625rem; }
.case-link { font-size: .8rem; color: var(--gold); font-weight: 500; }

.partner-logos { overflow: hidden; }
.logos-scroll {
  display: flex;
  gap: 1.5rem;
  animation: scrollLogos 20s linear infinite;
  width: max-content;
}
.logo-item {
  flex-shrink: 0;
  padding: .875rem 2rem;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  color: rgba(255,255,255,.7);
  font-size: .875rem;
  font-weight: 500;
  white-space: nowrap;
}
@keyframes scrollLogos {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ===== NEWS ===== */
.news-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.news-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.5rem;
  display: flex;
  gap: 1.25rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  border: 1px solid var(--border);
}
.news-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--red);
}
.news-card--featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--bg-light), #fff);
}
.news-card__date {
  flex-shrink: 0;
  text-align: center;
  width: 56px;
}
.date-day {
  display: block;
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--red);
  line-height: 1;
}
.date-month {
  display: block;
  font-size: .7rem;
  color: var(--text-muted);
  margin-top: .25rem;
}
.news-tag {
  display: inline-block;
  font-size: .7rem;
  padding: .15rem .5rem;
  background: rgba(139,26,26,.08);
  color: var(--red);
  background: #000;
  font-weight: 600;
  margin-bottom: .5rem;
}
.news-card__content h3 {
  font-size: .95rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: .5rem;
  line-height: 1.45;
}
.news-card--featured .news-card__content h3 { font-size: 1.1rem; }
.news-card__content p { font-size: .825rem; color: var(--text-muted); line-height: 1.65; margin-bottom: .625rem; }
.news-link { font-size: .8rem; color: var(--red); font-weight: 500; }

/* ===== CONTACT ===== */
.contact { background: var(--dark); }
.contact__inner {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 4rem;
  align-items: start;
}
.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.75rem;
  color: rgba(255,255,255,.8);
}
.contact-item__icon {
  width: 42px;
  height: 42px;
  background: rgba(212,175,55,.1);
  border: 1px solid rgba(212,175,55,.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--gold);
}
.contact-item__icon svg { width: 18px; height: 18px; }
.contact-item h4 {
  font-size: .8rem;
  font-weight: 600;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: .25rem;
}
.contact-item p { font-size: .875rem; line-height: 1.7; }

.social-links { display: flex; gap: .75rem; margin-top: .5rem; }
.social-link {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid rgba(255,255,255,.2);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,.6);
  transition: all var(--transition);
}
.social-link:hover {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(212,175,55,.1);
}
.social-link svg { width: 16px; height: 16px; }

/* Form */
.contact-form { background: rgba(255,255,255,.04); border: 1px solid rgba(255,255,255,.1); border-radius: var(--radius); padding: 2rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  font-size: .8rem;
  font-weight: 600;
  color: rgba(255,255,255,.7);
  margin-bottom: .5rem;
  text-transform: uppercase;
  letter-spacing: .05em;
}
.required { color: var(--gold); }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: .75rem 1rem;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 6px;
  color: #fff;
  font-size: .9rem;
  transition: border-color var(--transition);
  -webkit-appearance: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: rgba(255,255,255,.3); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--gold);
  background: rgba(255,255,255,.08);
}
.form-group select option { background: var(--dark); color: #fff; }
.form-group textarea { resize: vertical; min-height: 100px; }
.form-note { text-align: center; font-size: .75rem; color: rgba(255,255,255,.4); margin-top: .875rem; }

/* ===== FOOTER ===== */
.footer { background: #0D0D1A; }
.footer__main { padding: 4rem 0 2rem; }
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
}
.footer__logo .logo-cn { color: #fff; }
.footer__logo .logo-en { color: rgba(255,255,255,.5); }
.footer__brand-desc {
  margin-top: 1.25rem;
  font-size: .875rem;
  color: rgba(255,255,255,.45);
  line-height: 1.75;
}
.footer__nav-col h4 {
  font-size: .8rem;
  font-weight: 700;
  color: rgba(255,255,255,.8);
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: 1.25rem;
}
.footer__nav-col ul li { margin-bottom: .625rem; }
.footer__nav-col a {
  font-size: .875rem;
  color: rgba(255,255,255,.45);
  transition: color var(--transition);
}
.footer__nav-col a:hover { color: var(--gold); }
.footer__contact-list li {
  display: flex;
  align-items: flex-start;
  gap: .5rem;
  font-size: .825rem;
  color: rgba(255,255,255,.45);
  margin-bottom: .75rem;
}
.footer__contact-list svg { width: 14px; height: 14px; flex-shrink: 0; margin-top: 2px; color: rgba(255,255,255,.3); }
.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.07);
  padding: 1.25rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.footer__bottom .container { display: flex; justify-content: space-between; align-items: center; gap: 1rem; flex-wrap: wrap; }
.footer__bottom p { font-size: .8rem; color: rgba(255,255,255,.3); }

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  background: var(--red);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(16px);
  transition: all var(--transition);
  z-index: 900;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--red-dark);
  transform: translateY(-3px);
}
.back-to-top svg { width: 20px; height: 20px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .about__inner { grid-template-columns: 1fr; gap: 3rem; }
  .about__visual { max-width: 480px; margin: 0 auto; }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .footer__brand { grid-column: 1 / -1; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }

  /* Header mobile */
  .menu-toggle { display: flex; }
  .nav {
    position: fixed;
    top: 72px; left: 0; right: 0; bottom: 0;
    background: rgba(26,26,46,.97);
    backdrop-filter: blur(12px);
    padding: 1.5rem;
    display: none;
    flex-direction: column;
    overflow-y: auto;
    z-index: 999;
  }
  .nav.open { display: flex; }
  .nav__list { flex-direction: column; gap: .25rem; }
  .nav__link { font-size: 1rem; padding: .875rem 1.25rem; display: block; }
  .header.scrolled .nav { background: rgba(255,255,255,.97); }
  .header.scrolled .nav__link { color: var(--text); }

  /* Hero */
  .hero__title { font-size: 2.5rem; }
  .hero__desc { font-size: .95rem; }
  .stats-bar { flex-wrap: wrap; gap: 1rem; }
  .stat-item { width: 40%; }

  /* Products */
  .products-grid { grid-template-columns: 1fr; }

  /* Advantages */
  .advantages-grid { grid-template-columns: 1fr; }

  /* Process */
  .process-flow { flex-direction: column; }
  .process-arrow { display: none; }

  /* Cases */
  .cases-grid { grid-template-columns: 1fr; grid-template-rows: auto; }
  .case-card--large { grid-row: auto; }
  .case-card { min-height: 200px; }

  /* News */
  .news-grid { grid-template-columns: 1fr; }
  .news-card--featured { grid-column: auto; }

  /* Contact */
  .contact__inner { grid-template-columns: 1fr; gap: 2rem; }

  /* Form */
  .form-row { grid-template-columns: 1fr; }

  /* Footer */
  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom .container { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { text-align: center; justify-content: center; }
  .about__certs { grid-template-columns: 1fr; }
  .section-title { font-size: 1.75rem; }
}

/* ===== SCROLL REVEAL ===== */
.reveal {
  opacity: 0;
  pointer-events: none;
  transform: translateY(30px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: .1s; }
.reveal-delay-2 { transition-delay: .2s; }
.reveal-delay-3 { transition-delay: .3s; }
.reveal-delay-4 { transition-delay: .4s; }
.reveal-delay-5 { transition-delay: .5s; }

/* ===== FORM SUCCESS STATE ===== */
.form-success {
  text-align: center;
  padding: 3rem 2rem;
  color: #fff;
}
.form-success__icon {
  width: 64px;
  height: 64px;
  background: rgba(72,187,120,.15);
  border: 2px solid #48BB78;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.25rem;
}
.form-success__icon svg { width: 28px; height: 28px; color: #48BB78; }
.form-success h3 { font-size: 1.25rem; color: #fff; margin-bottom: .625rem; }
.form-success p { color: rgba(255,255,255,.6); font-size: .9rem; }

/* Real product images */
.product-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
  cursor: pointer;

  -webkit-user-drag: none;
  user-select: none;
}
.product-card:hover .product-card__img img {
  transform: scale(1.08);
}
@media (hover: none) {
  .product-card:hover .product-card__img img {
    transform: none;
  }
}

/* ── Lightbox ────────────────────────────────────────────────── */
.lightbox {
  display: none;
  position: fixed;
  z-index: 9999;
  inset: 0;
  background: rgba(0,0,0,.88);
  cursor: zoom-out;
  animation: lightboxFade .25s ease;
}
.lightbox.active {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}
.lightbox__img {
  max-width: 100vw;
  max-height: 100vh;
  display: block;
  background: #000;
  animation: lightboxZoom .3s ease;
  touch-action: auto;
}
.lightbox__img.zoomed {
  max-width: none;
  max-height: none;
}
.lightbox__close {
  position: absolute;
  top: 20px;
  right: 30px;
  color: #fff;
  font-size: 2.5rem;
  font-weight: 300;
  line-height: 1;
  cursor: pointer;
  opacity: .7;
  transition: opacity .2s;
  z-index: 1;
}
.lightbox__close:hover {
  opacity: 1;
}

@keyframes lightboxFade {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes lightboxZoom {
  from { transform: scale(.85); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

/* Zoom indicator on product images */
.product-card__img:has(img)::after {
  content: "🔍";
  position: absolute;
  top: 8px;
  right: 8px;
  font-size: 1rem;
  opacity: .5;
  z-index: 2;
  pointer-events: none;
  transition: opacity .2s;
}
.product-card__img:has(img):hover::after {
  opacity: .8;
}

/* Fullscreen toggle button */
.lightbox__fullscreen {
  position: absolute;
  top: 20px;
  right: 80px;
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
  opacity: .6;
  transition: opacity .2s;
  z-index: 1;
  font-family: sans-serif;
  line-height: 1;
  padding: 4px 8px;
  border: 1px solid rgba(255,255,255,.3);
  border-radius: 4px;
  background: rgba(0,0,0,.3);
}
.lightbox__fullscreen:hover {
  opacity: 1;
  border-color: rgba(255,255,255,.6);
}

/* ── Category Cards (homepage product links) ─────────────────────── */
.category-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}
.category-card {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .3s, box-shadow .3s;
  background: #fff;
}
.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.category-card__preview {
  position: relative;
  height: 280px;
  overflow: hidden;
  background: var(--light);
}
.category-card__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.category-card__preview img:first-child {
  display: block;
}
.category-card__preview img:nth-child(2) {
  position: absolute;
  top: 0; right: 0;
  width: 55%;
  height: 60%;
  border-left: 3px solid #fff;
  border-bottom: 3px solid #fff;
}
.category-card__count {
  position: absolute;
  bottom: 10px;
  right: 10px;
  background: rgba(0,0,0,.65);
  color: #fff;
  padding: .3rem .8rem;
  border-radius: 20px;
  font-size: .8rem;
  font-weight: 600;
}
.category-card__body {
  padding: 1.25rem 1.5rem;
}
.category-card__body h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: .3rem;
}
.category-card__body p {
  font-size: .85rem;
  color: #888;
  margin: 0;
}
@media (max-width: 640px) {
  .category-cards {
    grid-template-columns: 1fr;
    gap: 1.25rem;
  }
}