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

:root {
  --navy:    #062444;
  --blue:    #0D4F8B;
  --azure:   #1473C8;
  --sky:     #29A8E0;
  --teal:    #00BCD4;
  --white:   #FFFFFF;
  --gray-50: #F7F9FC;
  --gray-100:#EEF2F7;
  --gray-400:#9AAABF;
  --gray-600:#5A6B80;
  --gray-800:#2C3E50;

  --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei UI', 'Microsoft YaHei',
               -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--gray-800);
  background: var(--white);
  line-height: 1.7;
}

/* ── NAV ── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 5vw;
  height: 72px;
  background: rgba(6, 36, 68, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
  transition: background 0.3s;
}
.nav-logo {
  display: flex; align-items: center; gap: 12px; text-decoration: none;
}
.nav-logo-icon {
  width: 40px; height: 40px;
  /* background: linear-gradient(135deg, var(--sky), var(--teal)); */
  border-radius: 8px;
  display: grid; place-items: center;
}
.nav-logo-icon svg { width: 24px; height: 24px; fill: white; }
.nav-logo-text { color: white; }
.nav-logo-text .sub { font-size: 11px; font-weight: 400; opacity: 0.55; letter-spacing: 0.5px; }
.nav-logo-text .zh  { font-size: 15px; font-weight: 600; letter-spacing: 0.5px; }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a { color: rgba(255,255,255,0.8); text-decoration: none; font-size: 14px; font-weight: 400; transition: color 0.2s; }
.nav-links a:hover { color: var(--sky); }
.nav-cta {
  background: var(--sky); color: white; padding: 9px 22px;
  border-radius: 6px; text-decoration: none; font-size: 13px; font-weight: 500;
  transition: background 0.2s;
}
.nav-cta:hover { background: var(--teal); }
.nav-user-info { display: flex; align-items: center; gap: 8px; }
.nav-user-icon { width: 16px; height: 16px; fill: rgba(255,255,255,0.7); flex-shrink: 0; }
.nav-username { color: rgba(255,255,255,0.9); font-size: 13px; font-weight: 400; }
.nav-logout-btn {
  padding: 4px 10px; border-radius: 5px; font-size: 12px;
  color: rgba(255,255,255,0.65); border: 1px solid rgba(255,255,255,0.28);
  text-decoration: none; transition: color .2s, border-color .2s;
}
.nav-logout-btn:hover { color: #fff; border-color: rgba(255,255,255,0.6); }
.login-toast {
  position: fixed; top: 72px; left: 50%; transform: translateX(-50%);
  background: linear-gradient(135deg, var(--azure), var(--sky));
  color: #fff; padding: 10px 24px; border-radius: 8px; font-size: 14px;
  box-shadow: 0 4px 20px rgba(20,115,200,0.4); z-index: 999;
  display: flex; align-items: center; gap: 16px; transition: opacity .4s;
}
.login-toast button {
  background: none; border: none; color: rgba(255,255,255,0.8);
  font-size: 18px; cursor: pointer; padding: 0; line-height: 1;
}

/* ── HERO ── */
#hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background-image: url('./hero-bg.jpg');
  background-size: cover; background-position: center 30%;
}
.hero-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(6,36,68,0.93) 45%, rgba(13,79,139,0.7) 75%, rgba(41,168,224,0.25) 100%);
}
.hero-content {
  position: relative; z-index: 2;
  padding: 120px 5vw 80px;
  max-width: 760px;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(41,168,224,0.15); border: 1px solid rgba(41,168,224,0.4);
  color: var(--sky); padding: 6px 16px; border-radius: 20px;
  font-size: 13px;
  margin-bottom: 28px;
}
.hero-badge span { width: 6px; height: 6px; background: var(--sky); border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:.5;transform:scale(1.4)} }

h1 {
  font-size: clamp(2.2rem, 4.5vw, 3.8rem);
  font-weight: 700; color: white; line-height: 1.25;
  margin-bottom: 24px; letter-spacing: -0.5px;
}
.hero-desc {
  font-size: clamp(0.95rem, 1.5vw, 1.08rem);
  color: rgba(255,255,255,0.78); max-width: 560px;
  margin-bottom: 44px; font-weight: 300; line-height: 1.9;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  color: white; padding: 14px 32px; border-radius: 8px;
  text-decoration: none; font-size: 15px; font-weight: 500;
  box-shadow: 0 8px 24px rgba(20,115,200,0.4);
  transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(20,115,200,0.5); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1.5px solid rgba(255,255,255,0.4); color: white;
  padding: 14px 32px; border-radius: 8px; text-decoration: none;
  font-size: 15px; font-weight: 400;
  transition: background 0.2s, border-color 0.2s;
}
.btn-outline:hover { background: rgba(255,255,255,0.08); border-color: var(--sky); }

.hero-stats {
  position: absolute; bottom: 0; left: 0; right: 0; z-index: 2;
  display: flex; justify-content: center;
  background: rgba(255,255,255,0.06); backdrop-filter: blur(8px);
  border-top: 1px solid rgba(255,255,255,0.1);
}
.stat-item {
  flex: 1; max-width: 220px;
  padding: 24px 20px; text-align: center;
  border-right: 1px solid rgba(255,255,255,0.1);
}
.stat-item:last-child { border-right: none; }
.stat-num {
  font-size: 2rem; font-weight: 700;
  background: linear-gradient(135deg, var(--sky), var(--teal));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 12px; color: rgba(255,255,255,0.6); margin-top: 4px; font-weight: 300; }

/* ── SECTION COMMON ── */
section { padding: 96px 5vw; }
.section-tag {
  font-size: 11px; font-weight: 600; letter-spacing: 2.5px; text-transform: uppercase;
  color: var(--azure); margin-bottom: 12px;
  display: flex; align-items: center; gap: 10px;
}
.section-tag::before { content: ''; display: block; width: 28px; height: 2px; background: var(--sky); }
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem); font-weight: 700;
  color: var(--navy); line-height: 1.3; margin-bottom: 16px;
}
.section-desc {
  font-size: 1rem; color: var(--gray-600); max-width: 640px; line-height: 1.85; font-weight: 300;
}

/* ── ABOUT ── */
#about { background: var(--white); }
.about-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center;
  margin-top: 56px;
}
.about-image-wrap {
  position: relative; border-radius: 16px; overflow: hidden;
  box-shadow: 0 24px 64px rgba(6,36,68,0.18);
}
.about-image-wrap img { width: 100%; height: 440px; object-fit: cover; display: block; }
.about-image-badge {
  position: absolute; bottom: 24px; left: 24px;
  background: linear-gradient(135deg, var(--navy), var(--blue));
  color: white; padding: 16px 22px; border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.about-image-badge .num { font-size: 2rem; font-weight: 800; color: var(--sky); }
.about-image-badge .lbl { font-size: 12px; opacity: 0.8; }
.about-points { margin-top: 32px; display: flex; flex-direction: column; gap: 16px; }
.about-point {
  display: flex; gap: 14px; align-items: flex-start;
  padding: 16px 20px; background: var(--gray-50); border-radius: 10px;
  border-left: 3px solid var(--sky);
}
.about-point-icon {
  width: 36px; height: 36px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  border-radius: 8px; display: grid; place-items: center;
}
.about-point-icon svg { width: 18px; height: 18px; fill: white; }
.about-point-text strong { display: block; font-size: 14px; color: var(--navy); margin-bottom: 2px; }
.about-point-text span { font-size: 13px; color: var(--gray-600); font-weight: 300; }

/* ── SERVICES ── */
#services { background: var(--white); }
.services-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 56px;
}
.service-card {
  background: white; border-radius: 16px; overflow: hidden;
  box-shadow: 0 4px 20px rgba(6,36,68,0.07);
  transition: transform 0.3s, box-shadow 0.3s;
  border: 1px solid var(--gray-100);
}
.service-card:hover { transform: translateY(-6px); box-shadow: 0 16px 48px rgba(6,36,68,0.14); }
.service-card-img { width: 100%; height: 200px; object-fit: cover; display: block; }
.service-card-body { padding: 28px; }
.service-card-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  display: grid; place-items: center; margin-bottom: 16px;
}
.service-card-icon svg { width: 24px; height: 24px; fill: white; }
.service-card-title { font-size: 1.1rem; font-weight: 600; color: var(--navy); margin-bottom: 10px; }
.service-card-desc { font-size: 13.5px; color: var(--gray-600); line-height: 1.8; font-weight: 300; }
.service-card-tags { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  background: var(--gray-100); color: var(--azure);
  padding: 4px 10px; border-radius: 4px; font-size: 11px; font-weight: 500;
}

/* ── BRANDS ── */
#brands { background: var(--gray-50); }
.brands-header { display: flex; justify-content: space-between; align-items: flex-end; margin-bottom: 48px; flex-wrap: wrap; gap: 20px; }
.brands-grid {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 1px;
  background: var(--gray-100); border: 1px solid var(--gray-100); border-radius: 12px; overflow: hidden;
}
.brand-cell {
  background: white; padding: 32px 20px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  transition: background 0.2s;
}
.brand-cell:hover { background: var(--gray-50); }
.brand-logo {
  width: 60px; height: 60px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 800;
  font-size: 14px; letter-spacing: -0.5px;
}
.brand-name { font-size: 13px; color: var(--gray-600); font-weight: 500; }
.ge-logo  { background: #003087; color: white; }
.ph-logo  { background: #0066A1; color: white; }
.si-logo  { background: #009999; color: white; }
.co-logo  { background: #E8332A; color: white; }
.ol-logo  { background: #0033A0; color: white; }
.ks-logo  { background: #2E7D32; color: white; }

/* ── PROJECTS ── */
#projects { background: var(--white); }
.projects-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 56px;
}
.project-card {
  background: white; border-radius: 16px; padding: 32px;
  box-shadow: 0 4px 20px rgba(6,36,68,0.07);
  border: 1px solid var(--gray-100);
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex; flex-direction: column; gap: 16px;
}
.project-card:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(6,36,68,0.12); }
.project-card.featured {
  grid-column: span 2;
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
  color: white; flex-direction: row; gap: 40px; align-items: center;
}
.project-card.featured .project-amount { color: var(--sky); }
.project-card.featured .project-name  { color: white; }
.project-card.featured .project-desc  { color: rgba(255,255,255,0.7); }
.project-card.featured .project-label { color: rgba(255,255,255,0.5); }
.project-feat-img {
  width: 240px; height: 160px; flex-shrink: 0;
  border-radius: 12px; object-fit: cover;
  box-shadow: 0 8px 24px rgba(0,0,0,0.3);
}
.project-top { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.project-amount { font-size: 1.8rem; font-weight: 800; color: var(--azure); line-height: 1; }
.project-amount-unit { font-size: 1rem; font-weight: 500; }
.project-type {
  background: var(--gray-100); color: var(--azure);
  padding: 4px 12px; border-radius: 20px; font-size: 11px; font-weight: 600;
  white-space: nowrap; height: fit-content;
}
.project-type.intl { background: rgba(0,188,212,0.1); color: var(--teal); }
.project-name  { font-size: 1.05rem; font-weight: 600; color: var(--navy); }
.project-label { font-size: 12px; color: var(--gray-400); font-weight: 400; margin-top: 2px; }
.project-desc  { font-size: 13px; color: var(--gray-600); line-height: 1.7; font-weight: 300; }

/* ── GROUP ── */
#group {
  background: linear-gradient(160deg, var(--navy) 0%, var(--blue) 60%, #0A6B9E 100%);
  color: white;
}
#group .section-tag { color: var(--sky); }
#group .section-tag::before { background: var(--sky); }
#group .section-title { color: white; }
#group .section-desc { color: rgba(255,255,255,0.7); max-width: 760px; }
.group-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; margin-top: 56px;
}
.group-pillar {
  background: rgba(255,255,255,0.07); border: 1px solid rgba(255,255,255,0.12);
  border-radius: 14px; padding: 28px 22px;
  transition: background 0.2s, transform 0.2s;
}
.group-pillar:hover { background: rgba(255,255,255,0.12); transform: translateY(-4px); }
.group-pillar-num   { font-size: 2.2rem; font-weight: 800; color: var(--sky); margin-bottom: 8px; line-height: 1; }
.group-pillar-title { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.group-pillar-desc  { font-size: 13px; color: rgba(255,255,255,0.6); line-height: 1.7; font-weight: 300; }
.group-mission {
  margin-top: 56px; text-align: center;
  background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.12);
  border-radius: 20px; padding: 48px;
}
.group-mission-label { font-size: 11px; letter-spacing: 2px; text-transform: uppercase; color: var(--sky); margin-bottom: 20px; }
.group-mission-text  { font-size: clamp(1rem, 2vw, 1.3rem); font-weight: 400; line-height: 1.9; color: rgba(255,255,255,0.88); max-width: 700px; margin: 0 auto; }

/* ── CONTACT ── */
#contact { background: var(--gray-50); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; margin-top: 56px; align-items: start; }
.contact-info { display: flex; flex-direction: column; gap: 24px; }
.contact-item {
  display: flex; gap: 16px; align-items: flex-start;
  padding: 20px; background: white; border-radius: 12px;
  box-shadow: 0 2px 12px rgba(6,36,68,0.06);
}
.contact-item-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  border-radius: 10px; display: grid; place-items: center;
}
.contact-item-icon svg { width: 20px; height: 20px; fill: white; }
.contact-item-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--gray-400); margin-bottom: 4px; }
.contact-item-value { font-size: 15px; font-weight: 500; color: var(--navy); }
.contact-map {
  border-radius: 16px; overflow: hidden;
  box-shadow: 0 8px 32px rgba(6,36,68,0.12);
  height: 380px;
}
.contact-map img { width: 100%; height: 100%; object-fit: cover; filter: saturate(0.7) brightness(0.9); display: block; }

/* ── PRODUCTS ── */
#products { background: var(--white); }
.products-list { display: flex; flex-direction: column; gap: 32px; margin-top: 56px; }

.product-card {
  display: flex;
  background: white;
  border: 1px solid var(--gray-100);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(6,36,68,0.06);
  transition: box-shadow 0.3s, transform 0.3s;
  min-height: 340px;
}
.product-card:hover {
  box-shadow: 0 16px 48px rgba(6,36,68,0.13);
  transform: translateY(-3px);
}

/* 图片在左，文字在右（默认） */
.product-img-wrap {
  width: 50%; flex-shrink: 0;
}
.product-img-wrap img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
}

/* 文字在左，图片在右（反转） */
.product-card-reverse {
  flex-direction: row-reverse;
}

/* 文字内容列 */
.product-content {
  flex: 1; display: flex; flex-direction: column; min-width: 0;
}

.product-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 28px 32px 24px;
  background: linear-gradient(135deg, var(--navy) 0%, var(--blue) 100%);
}
.product-header-text { flex: 1; min-width: 0; }
.product-brand { font-size: 11px; font-weight: 500; color: rgba(255,255,255,0.55); letter-spacing: 0.5px; margin-bottom: 6px; }
.product-name  { font-size: 20px; font-weight: 700; color: white; line-height: 1.25; }
.product-model { font-size: 12px; color: rgba(255,255,255,0.5); margin-top: 5px; font-weight: 300; }
.nmpa-btn {
  display: inline-flex; align-items: center; gap: 5px;
  margin-top: 10px; padding: 5px 12px;
  background: rgba(255,255,255,0.12); border: 1px solid rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.85); font-size: 11px; font-weight: 500; border-radius: 4px;
  text-decoration: none; cursor: pointer; transition: background .2s, border-color .2s;
  white-space: nowrap;
}
.nmpa-btn::after { content: '↗'; font-size: 10px; opacity: 0.7; }
.nmpa-btn:hover { background: rgba(255,255,255,0.22); border-color: rgba(255,255,255,0.5); color: #fff; }

.product-badge {
  flex-shrink: 0;
  background: rgba(41,168,224,0.2);
  border: 1px solid rgba(41,168,224,0.4);
  color: var(--sky);
  padding: 5px 14px; border-radius: 20px;
  font-size: 12px; font-weight: 600;
  white-space: nowrap;
}
.product-badge-teal {
  background: rgba(0,188,212,0.2);
  border-color: rgba(0,188,212,0.4);
  color: var(--teal);
}

.product-body { padding: 24px 32px 28px; flex: 1; }

.product-desc {
  font-size: 14px; color: var(--gray-600);
  line-height: 1.85; font-weight: 300;
  margin-bottom: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--gray-100);
}

.product-meta-row {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  margin-bottom: 18px;
}
.product-meta-item {
  background: var(--gray-50); border-radius: 10px;
  padding: 10px 14px;
}
.product-meta-label { font-size: 11px; font-weight: 600; color: var(--azure); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 4px; }
.product-meta-val   { font-size: 13px; color: var(--gray-800); font-weight: 400; line-height: 1.5; }

.product-features { display: flex; flex-direction: column; gap: 8px; }
.product-feature {
  display: flex; align-items: baseline; gap: 10px;
  font-size: 13px; color: var(--gray-600); font-weight: 300;
}
.feature-dot {
  width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  position: relative; top: -1px;
}
.nmpa-btn {
  display: inline-flex; align-items: center; gap: 5px;
  margin-top: 10px; padding: 4px 10px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.25);
  color: rgba(255,255,255,0.6); font-size: 11px; font-weight: 400;
  border-radius: 4px; text-decoration: none; cursor: pointer;
  transition: border-color .2s, color .2s, background .2s;
  white-space: nowrap;
}
.nmpa-btn::after {
  content: ' ↗'; font-size: 10px; opacity: 0.7;
}
.nmpa-btn:hover {
  border-color: rgba(255,255,255,0.5);
  color: rgba(255,255,255,0.9);
  background: rgba(255,255,255,0.08);
}
.nmpa-hint {
  margin-top: 6px;
  font-size: 11px;
  color: rgba(255,255,255,0.4);
  font-weight: 300;
  line-height: 1.4;
  white-space: nowrap;
}
.product-detail-btn {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 20px; padding: 9px 20px;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  color: #fff; font-size: 13px; font-weight: 500; border-radius: 6px;
  border: none; cursor: pointer; text-decoration: none;
  float: right; transition: transform .2s, box-shadow .2s;
}
.product-detail-btn .btn-price {
  background: rgba(255,255,255,0.25); border-radius: 4px;
  padding: 1px 7px; font-size: 12px; font-weight: 700; letter-spacing: .5px;
}
.product-detail-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(20,115,200,0.4); }

@media (max-width: 900px) {
  .product-card, .product-card-reverse { flex-direction: column; }
  .product-img-wrap { width: 100%; height: 240px; }
  .product-card-header { padding: 20px 24px; }
  .product-body { padding: 20px 24px; }
  .product-meta-row { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .product-meta-row { grid-template-columns: 1fr; }
}

/* ── FOOTER ── */
footer {
  background: var(--navy); color: rgba(255,255,255,0.6);
  padding: 48px 5vw 32px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .zh { font-size: 16px; font-weight: 600; color: white; margin-bottom: 4px; }
.footer-brand .sub { font-size: 11px; letter-spacing: 0.5px; color: var(--sky); margin-bottom: 16px; }
.footer-brand p { font-size: 13px; line-height: 1.8; font-weight: 300; max-width: 280px; }
.footer-col h4 { font-size: 13px; font-weight: 600; color: white; margin-bottom: 16px; }
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { color: rgba(255,255,255,0.55); text-decoration: none; font-size: 13px; transition: color 0.2s; }
.footer-col ul li a:hover { color: var(--sky); }
.footer-divider { border: none; border-top: 1px solid rgba(255,255,255,0.08); margin-bottom: 24px; }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; font-size: 12px; }
.footer-bottom a { color: var(--sky); text-decoration: none; }

/* ── SCROLL ANIMATION ── */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: 1fr 1fr; }
  .group-grid    { grid-template-columns: 1fr 1fr; }
  .brands-grid   { grid-template-columns: repeat(3, 1fr); }
  .footer-grid   { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  nav { padding: 0 24px; }
  .nav-links, .nav-cta { display: none; }
  section { padding: 64px 24px; }
  .about-grid, .projects-grid, .contact-grid { grid-template-columns: 1fr; }
  .project-card.featured { grid-column: span 1; flex-direction: column; }
  .project-feat-img { width: 100%; }
  .services-grid { grid-template-columns: 1fr; }
  .group-grid    { grid-template-columns: 1fr; }
  .brands-grid   { grid-template-columns: repeat(2, 1fr); }
  .footer-grid   { grid-template-columns: 1fr; }
  .hero-stats    { display: none; }
}

/* ── BACK TO TOP ── */
.back-to-top {
  position: fixed;
  right: 32px;
  bottom: 36px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--azure), var(--sky));
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(20,115,200,0.35);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .3s, transform .3s, background .2s;
  z-index: 90;
  pointer-events: none;
}
.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.back-to-top:hover { background: linear-gradient(135deg, var(--blue), var(--azure)); }
.back-to-top svg { width: 20px; height: 20px; fill: #fff; }