/* ==============================================
   伴旅智导科技有限公司 - 官方网站样式
   www.banlv-ai.com
   ============================================== */

/* ---- CSS Variables ---- */
:root {
  --bg-0:       #060b14;
  --bg-1:       #0a1120;
  --bg-card:    #0d1828;
  --bg-card-h:  #121f33;
  --c-primary:  #1a6dff;
  --c-cyan:     #00d4ff;
  --c-purple:   #7c3aed;
  --c-green:    #10b981;
  --c-text:     #dde6f0;
  --c-muted:    #5a7090;
  --c-border:   rgba(255,255,255,0.07);
  --radius:     14px;
  --trans:      0.3s ease;
  --glow-blue:  0 0 40px rgba(26,109,255,0.18);
  --font:       'Inter','Noto Sans SC',system-ui,sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg-0);
  color: var(--c-text);
  line-height: 1.65;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; }
input, textarea, select {
  font-family: inherit;
  font-size: 14px;
}

/* ---- Utilities ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.section { padding: 110px 0; }

.section-header { text-align: center; margin-bottom: 70px; }
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 18px;
  background: rgba(26,109,255,0.12);
  border: 1px solid rgba(26,109,255,0.28);
  border-radius: 20px;
  color: var(--c-cyan);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
}
.section-header h2 {
  font-size: clamp(26px,3.8vw,42px);
  font-weight: 800;
  color: #fff;
  line-height: 1.28;
}

.gradient-text {
  background: linear-gradient(120deg, var(--c-primary) 0%, var(--c-cyan) 50%, var(--c-purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 30px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 600;
  border: none;
  transition: all var(--trans);
  cursor: pointer;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-purple));
  color: #fff;
  box-shadow: 0 4px 20px rgba(26,109,255,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(26,109,255,0.5);
}
.btn-outline {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.25);
}
.btn-outline:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.5);
  transform: translateY(-2px);
}
.btn-full { width: 100%; justify-content: center; }

/* Scroll animations */
.anim-fade-up {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s cubic-bezier(.4,0,.2,1),
              transform 0.7s cubic-bezier(.4,0,.2,1);
}
.anim-fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}
/* stagger siblings */
.tech-grid   .tech-card:nth-child(2)  { transition-delay: 0.08s; }
.tech-grid   .tech-card:nth-child(3)  { transition-delay: 0.16s; }
.tech-grid   .tech-card:nth-child(4)  { transition-delay: 0.10s; }
.tech-grid   .tech-card:nth-child(5)  { transition-delay: 0.18s; }
.tech-grid   .tech-card:nth-child(6)  { transition-delay: 0.26s; }
.products-grid .product-card:nth-child(2) { transition-delay: 0.10s; }
.products-grid .product-card:nth-child(3) { transition-delay: 0.08s; }
.products-grid .product-card:nth-child(4) { transition-delay: 0.16s; }
.cases-grid  .case-card:nth-child(2)  { transition-delay: 0.10s; }
.cases-grid  .case-card:nth-child(3)  { transition-delay: 0.08s; }
.cases-grid  .case-card:nth-child(4)  { transition-delay: 0.16s; }

/* =============================================
   NAVBAR
   ============================================= */
.navbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 900;
  padding: 18px 0;
  transition: all var(--trans);
}
.navbar.scrolled {
  padding: 10px 0;
  background: rgba(6,11,20,0.92);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--c-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 17px;
  color: #fff;
}
.logo-hex {
  font-size: 26px;
  color: var(--c-cyan);
  line-height: 1;
  filter: drop-shadow(0 0 8px rgba(0,212,255,0.6));
}
.logo-accent { color: var(--c-cyan); }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav-link {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  transition: all var(--trans);
}
.nav-link:hover, .nav-link.active {
  color: #fff;
  background: rgba(255,255,255,0.07);
}
.nav-cta {
  background: linear-gradient(135deg, var(--c-primary), var(--c-purple)) !important;
  color: #fff !important;
  padding: 8px 22px !important;
  box-shadow: 0 3px 14px rgba(26,109,255,0.3);
}
.nav-cta:hover {
  transform: translateY(-1px) !important;
  box-shadow: 0 6px 20px rgba(26,109,255,0.45) !important;
  background: linear-gradient(135deg, var(--c-primary), var(--c-purple)) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--trans);
}

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  height: 100vh;
  min-height: 720px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: radial-gradient(ellipse 80% 60% at 50% 40%, #0d1e42 0%, var(--bg-0) 68%);
}

#particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

/* Grid overlay */
.hero-grid {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(26,109,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,109,255,0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 880px;
  padding: 0 28px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 20px;
  background: rgba(0,212,255,0.08);
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: 30px;
  color: var(--c-cyan);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 28px;
}
.badge-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-cyan);
  box-shadow: 0 0 8px var(--c-cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.85); }
}

.hero-title {
  font-size: clamp(38px,6.5vw,76px);
  font-weight: 900;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 22px;
  letter-spacing: -0.01em;
}

.hero-desc {
  font-size: clamp(15px,1.8vw,18px);
  color: rgba(255,255,255,0.58);
  line-height: 1.8;
  max-width: 500px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-bottom: 64px;
  flex-wrap: wrap;
}

/* Stats */
.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--c-border);
  border-radius: 16px;
  padding: 24px 40px;
  backdrop-filter: blur(8px);
  max-width: 680px;
  margin: 0 auto;
}
.stat-item { flex: 1; min-width: 120px; text-align: center; padding: 8px 0; }
.stat-row {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 3px;
}
.stat-num {
  font-size: 38px;
  font-weight: 900;
  color: #fff;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat-plus {
  font-size: 22px;
  font-weight: 800;
  color: var(--c-cyan);
  margin-left: 2px;
}
.stat-label {
  display: block;
  font-size: 13px;
  color: rgba(255,255,255,0.45);
  margin-top: 6px;
}
.stat-divider {
  width: 1px;
  height: 44px;
  background: var(--c-border);
  flex-shrink: 0;
}

.hero-scroll {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.scroll-line {
  width: 1px;
  height: 50px;
  background: linear-gradient(to bottom, transparent, var(--c-cyan));
  animation: scrollFade 2s ease-in-out infinite;
}
@keyframes scrollFade {
  0%,100% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); }
}

/* =============================================
   ABOUT
   ============================================= */
.about { background: var(--bg-1); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 80px;
  align-items: center;
}

/* Orbit Animation */
.orbit-container {
  position: relative;
  width: 340px;
  height: 340px;
  margin: 0 auto;
}

.orbit {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
}
.orbit-1 { width: 100%; height: 100%; border-color: rgba(26,109,255,0.25); animation: orbit1 20s linear infinite; }
.orbit-2 { width: 72%;  height: 72%;  border-color: rgba(0,212,255,0.22);  animation: orbit1 14s linear infinite reverse; }
.orbit-3 { width: 46%;  height: 46%;  border-color: rgba(124,58,237,0.28); animation: orbit1 9s linear infinite; }

@keyframes orbit1 {
  from { transform: translate(-50%,-50%) rotate(0deg); }
  to   { transform: translate(-50%,-50%) rotate(360deg); }
}

.orbit-dot {
  position: absolute;
  width: 10px; height: 10px;
  border-radius: 50%;
  top: -5px; left: calc(50% - 5px);
}
.dot-blue   { background: var(--c-primary); box-shadow: 0 0 10px var(--c-primary); }
.dot-cyan   { background: var(--c-cyan);    box-shadow: 0 0 10px var(--c-cyan); }
.dot-purple { background: var(--c-purple);  box-shadow: 0 0 10px var(--c-purple); }

.orbit-core {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%,-50%);
  width: 90px; height: 90px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-primary), var(--c-purple));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: #fff;
  box-shadow: 0 0 50px rgba(26,109,255,0.45);
  z-index: 2;
}

.orbit-label {
  position: absolute;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 11px;
  font-weight: 600;
  color: rgba(255,255,255,0.55);
  white-space: nowrap;
  z-index: 3;
}
.label-1 { top: 8%;  right: -16px; }
.label-2 { bottom: 8%;  right: -16px; }
.label-3 { top: 8%;  left: -16px; }
.label-4 { bottom: 8%;  left: -16px; }

/* About content */
.about-content p {
  color: rgba(255,255,255,0.65);
  margin-bottom: 18px;
  line-height: 1.82;
  font-size: 15px;
}
.about-lead {
  font-size: 17px !important;
  color: rgba(255,255,255,0.88) !important;
  font-weight: 500;
  margin-bottom: 20px !important;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-top: 32px;
}
.value-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}
.value-icon {
  width: 42px; height: 42px;
  flex-shrink: 0;
  border-radius: 11px;
  background: rgba(26,109,255,0.12);
  border: 1px solid rgba(26,109,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-cyan);
  font-size: 15px;
}
.value-text h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--c-cyan);
  margin-bottom: 3px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.value-text p {
  font-size: 14px !important;
  margin: 0 !important;
  color: rgba(255,255,255,0.6) !important;
}

/* =============================================
   TECHNOLOGY
   ============================================= */
.technology { background: var(--bg-0); }

.tech-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
.tech-card {
  background: var(--bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 34px 30px;
  transition: all var(--trans);
  position: relative;
  overflow: hidden;
}
.tech-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(26,109,255,0.06) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--trans);
}
.tech-card:hover {
  background: var(--bg-card-h);
  border-color: rgba(26,109,255,0.3);
  transform: translateY(-5px);
  box-shadow: var(--glow-blue);
}
.tech-card:hover::before { opacity: 1; }

.tech-icon-wrap {
  width: 56px; height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(26,109,255,0.18), rgba(124,58,237,0.18));
  border: 1px solid rgba(26,109,255,0.28);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: var(--c-cyan);
  margin-bottom: 22px;
  position: relative;
  z-index: 1;
}
.tech-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}
.tech-card p {
  font-size: 13.5px;
  color: rgba(255,255,255,0.5);
  line-height: 1.75;
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}
.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  position: relative;
  z-index: 1;
}
.tech-tags span {
  padding: 3px 10px;
  background: rgba(0,212,255,0.07);
  border: 1px solid rgba(0,212,255,0.18);
  border-radius: 5px;
  font-size: 11.5px;
  font-weight: 600;
  color: var(--c-cyan);
  letter-spacing: 0.02em;
}

/* =============================================
   PRODUCTS
   ============================================= */
.products { background: var(--bg-1); }

.products-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.product-card {
  background: var(--bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--trans);
}
.product-card:hover {
  border-color: rgba(26,109,255,0.35);
  transform: translateY(-5px);
  box-shadow: var(--glow-blue);
}

.product-header {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 28px 28px 0;
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 28px;
  padding-bottom: 24px;
}
.product-h-icon {
  width: 52px; height: 52px;
  border-radius: 13px;
  background: var(--pd-color, var(--c-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.product-h-text { flex: 1; }
.product-tag {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pd-color, var(--c-cyan));
  margin-bottom: 5px;
}
.product-h-text h3 {
  font-size: 18px;
  font-weight: 700;
  color: #fff;
}

.product-body {
  padding: 0 28px 28px;
}
.product-body > p {
  font-size: 14px;
  color: rgba(255,255,255,0.52);
  line-height: 1.76;
  margin-bottom: 20px;
}

.product-features {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 24px;
}
.product-features li {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13.5px;
  color: rgba(255,255,255,0.62);
}
.product-features li i {
  color: var(--c-green);
  font-size: 11px;
  flex-shrink: 0;
}

.product-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-cyan);
  transition: gap var(--trans), opacity var(--trans);
}
.product-link:hover { gap: 12px; }

/* =============================================
   CASES
   ============================================= */
.cases { background: var(--bg-0); }

.cases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.case-card {
  background: var(--bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 34px;
  transition: all var(--trans);
  position: relative;
  overflow: hidden;
}
.case-card::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--cc, var(--c-primary));
}
.case-card:hover {
  background: var(--bg-card-h);
  transform: translateY(-5px);
  border-color: rgba(255,255,255,0.12);
  box-shadow: 0 12px 40px rgba(0,0,0,0.35);
}

.case-top {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}
.case-icon {
  width: 48px; height: 48px;
  border-radius: 12px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  color: var(--cc, var(--c-cyan));
}
.case-tag {
  padding: 3px 12px;
  border-radius: 5px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cc, var(--c-cyan));
  background: rgba(255,255,255,0.05);
}

.case-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 12px;
  line-height: 1.4;
}
.case-card p {
  font-size: 14px;
  color: rgba(255,255,255,0.52);
  line-height: 1.76;
  margin-bottom: 28px;
}

.case-metrics {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}
.metric-box {
  display: flex;
  flex-direction: column;
  gap: 3px;
}
.metric-val {
  font-size: 22px;
  font-weight: 900;
  color: #fff;
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.metric-val em {
  font-style: normal;
  font-size: 13px;
  font-weight: 600;
  color: var(--cc, var(--c-cyan));
}
.metric-desc {
  font-size: 12px;
  color: rgba(255,255,255,0.38);
  font-weight: 500;
}

/* =============================================
   CONTACT
   ============================================= */
.contact { background: var(--bg-1); }

.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1.55fr;
  gap: 60px;
  align-items: flex-start;
}

/* Info */
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.ci-icon {
  width: 44px; height: 44px;
  border-radius: 11px;
  background: rgba(26,109,255,0.12);
  border: 1px solid rgba(26,109,255,0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--c-cyan);
  font-size: 16px;
  flex-shrink: 0;
}
.ci-text h4 {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: rgba(255,255,255,0.4);
  margin-bottom: 4px;
}
.ci-text p {
  font-size: 15px;
  color: rgba(255,255,255,0.85);
}

.contact-cert {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 8px;
  padding: 22px;
  background: var(--bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}
.cert-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: rgba(255,255,255,0.55);
}
.cert-item i { color: var(--c-cyan); font-size: 13px; }

/* Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 42px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}
.form-group label {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.55);
}
.required { color: #ff4d6d; }

.form-group input,
.form-group select,
.form-group textarea {
  background: var(--bg-1);
  border: 1px solid var(--c-border);
  border-radius: 9px;
  padding: 12px 16px;
  color: #fff;
  outline: none;
  resize: vertical;
  transition: border-color var(--trans), box-shadow var(--trans);
  appearance: none;
  -webkit-appearance: none;
}
.form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M6 8L0 0h12z' fill='%235a7090'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(26,109,255,0.12);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255,255,255,0.2);
}
.form-group select option { background: #0d1828; color: #fff; }

.form-tip {
  text-align: center;
  font-size: 12.5px;
  color: var(--c-muted);
  margin-top: 12px;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: #04080f;
  border-top: 1px solid var(--c-border);
  padding: 70px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.2fr;
  gap: 56px;
  margin-bottom: 56px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
}
.footer-brand p {
  font-size: 14px;
  color: rgba(255,255,255,0.38);
  line-height: 1.7;
  margin-bottom: 24px;
}
.footer-social {
  display: flex;
  gap: 10px;
}
.footer-social a {
  width: 36px; height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.45);
  font-size: 14px;
  transition: all var(--trans);
}
.footer-social a:hover {
  background: rgba(26,109,255,0.18);
  border-color: rgba(26,109,255,0.35);
  color: var(--c-cyan);
  transform: translateY(-2px);
}

.footer-links h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: rgba(255,255,255,0.5);
  margin-bottom: 20px;
}
.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer-links ul li,
.footer-links ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.4);
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color var(--trans);
}
.footer-links ul li a:hover { color: rgba(255,255,255,0.75); }
.footer-links ul li i { font-size: 13px; color: rgba(255,255,255,0.25); width: 16px; }

.footer-bottom {
  border-top: 1px solid var(--c-border);
  padding-top: 28px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.28);
}
.footer-bottom a {
  color: rgba(255,255,255,0.28);
  transition: color var(--trans);
}
.footer-bottom a:hover { color: rgba(255,255,255,0.6); }
.footer-sep { margin: 0 10px; color: rgba(255,255,255,0.15); }

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1100px) {
  .tech-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { order: -1; }
  .orbit-container { width: 240px; height: 240px; }
  .orbit-core { width: 70px; height: 70px; font-size: 28px; }
  .label-1,.label-2,.label-3,.label-4 { display: none; }
  .products-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .contact-wrapper { grid-template-columns: 1fr; }
  .contact-cert { display: none; }
}

@media (max-width: 768px) {
  .section { padding: 80px 0; }

  .nav-menu {
    display: none;
    position: fixed;
    top: 60px;
    inset: 60px 0 auto 0;
    background: rgba(6,11,20,0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 20px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--c-border);
    z-index: 800;
  }
  .nav-menu.open { display: flex; }
  .nav-link { width: 100%; padding: 12px 16px; border-radius: 10px; }
  .nav-toggle { display: flex; }
  .nav-cta { text-align: center; }

  .hero-stats { padding: 18px 20px; gap: 0; }
  .stat-divider { height: 30px; }
  .stat-num { font-size: 28px; }
  .stat-plus { font-size: 18px; }

  .tech-grid { grid-template-columns: 1fr; }

  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 28px 22px; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
  .hero-stats { flex-wrap: wrap; }
  .stat-item { min-width: 48%; }
  .stat-divider { display: none; }
  .case-metrics { gap: 16px; }
}

/* =============================================
   SCROLLBAR
   ============================================= */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: rgba(26,109,255,0.35); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(26,109,255,0.55); }

/* =============================================
   SELECTION
   ============================================= */
::selection { background: rgba(26,109,255,0.3); color: #fff; }