/* =============================================================================
   HECAIJI TECHNOLOGY - Main Stylesheet
   Version: 1.0.0
   ============================================================================= */

/* ---- CSS Variables ---- */
:root {
  --color-primary: #0052D4;
  --color-primary-dark: #001a6e;
  --color-primary-light: #4364F7;
  --color-accent: #6fb1ff;
  --color-secondary: #FF6B35;
  --color-text: #1a1a2e;
  --color-text-light: #5a5a7a;
  --color-text-muted: #9090aa;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7ff;
  --color-bg-dark: #06091a;
  --color-border: #e4e9f2;
  --color-success: #22c55e;
  --font-sans: 'Inter', 'Segoe UI', Arial, sans-serif;
  --font-size-base: 16px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 32px;
  --shadow-sm: 0 2px 8px rgba(0, 82, 212, 0.08);
  --shadow-md: 0 8px 32px rgba(0, 82, 212, 0.12);
  --shadow-lg: 0 20px 60px rgba(0, 82, 212, 0.15);
  --transition: 0.3s ease;
  --container-max: 1200px;
  --nav-height: 72px;
}

/* ---- Reset & Base ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  overflow-x: hidden;
}

img, svg { display: block; max-width: 100%; }

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--color-primary-light); }

ul, ol { list-style: none; }

button {
  font-family: var(--font-sans);
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: 700;
  color: var(--color-text);
}

/* ---- Layout Utilities ---- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section--dark {
  background: var(--color-bg-dark);
  color: #fff;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-header .eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(0, 82, 212, 0.08);
  border-radius: 20px;
  padding: 4px 16px;
  margin-bottom: 16px;
}

.section-header h2 {
  font-size: clamp(28px, 4vw, 44px);
  color: var(--color-text);
  margin-bottom: 16px;
}

.section--dark .section-header h2 { color: #fff; }

.section-header p {
  font-size: 17px;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto;
}

.section--dark .section-header p { color: rgba(255,255,255,0.65); }

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 15px;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 82, 212, 0.35);
}
.btn--primary:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 82, 212, 0.45);
}

.btn--outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.5);
}
.btn--outline:hover {
  color: #fff;
  border-color: #fff;
  background: rgba(255,255,255,0.1);
}

.btn--outline-dark {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn--outline-dark:hover {
  background: var(--color-primary);
  color: #fff;
}

.btn svg { width: 18px; height: 18px; flex-shrink: 0; }

/* ---- Navigation ---- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--transition), box-shadow var(--transition);
}

.nav--transparent { background: transparent; }

.nav--solid {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(12px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav__logo img, .nav__logo svg { height: 40px; width: auto; }

.nav__menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__link {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(255,255,255,0.88);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav--solid .nav__link { color: var(--color-text); }

.nav__link:hover,
.nav__link.active {
  color: #fff;
  background: rgba(255,255,255,0.15);
}

.nav--solid .nav__link:hover,
.nav--solid .nav__link.active {
  color: var(--color-primary);
  background: rgba(0, 82, 212, 0.07);
}

.nav__cta {
  margin-left: 8px;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  cursor: pointer;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: #fff;
  border-radius: 2px;
  transition: all var(--transition);
}

.nav--solid .nav__toggle span { background: var(--color-text); }

/* ---- Hero Section ---- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: var(--nav-height);
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg svg, .hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(0,26,110,0.92) 0%, rgba(0,82,212,0.8) 60%, rgba(67,100,247,0.7) 100%);
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 680px;
  color: #fff;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  color: rgba(255,255,255,0.9);
  margin-bottom: 28px;
  backdrop-filter: blur(4px);
}

.hero__badge svg { width: 14px; height: 14px; color: var(--color-accent); }

.hero h1 {
  font-size: clamp(36px, 5.5vw, 68px);
  color: #fff;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 24px;
  letter-spacing: -1px;
}

.hero h1 .highlight {
  background: linear-gradient(90deg, #6fb1ff, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: 18px;
  color: rgba(255,255,255,0.75);
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

.hero__stats {
  display: flex;
  gap: 48px;
  padding-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.15);
}

.hero__stat-value {
  font-size: 32px;
  font-weight: 800;
  color: #fff;
  line-height: 1;
  margin-bottom: 4px;
}

.hero__stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.5px;
}

/* ---- Partners / Logos Bar ---- */
.partners {
  padding: 32px 0;
  background: #fff;
  border-bottom: 1px solid var(--color-border);
}

.partners__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.partners__label {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: 500;
  white-space: nowrap;
  margin-right: 8px;
}

.partners__logos {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
}

.partner-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 6px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.partner-badge:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(0,82,212,0.04);
}

.partner-badge svg { width: 16px; height: 16px; }

/* ---- Services / Business Section ---- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.service-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.service-card:hover::before { transform: scaleX(1); }

.service-card__icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, rgba(0,82,212,0.1), rgba(67,100,247,0.08));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--color-primary);
  transition: all var(--transition);
}

.service-card__icon svg { width: 28px; height: 28px; }

.service-card:hover .service-card__icon {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  color: #fff;
}

.service-card h3 {
  font-size: 22px;
  margin-bottom: 14px;
}

.service-card p {
  color: var(--color-text-light);
  font-size: 15px;
  line-height: 1.7;
  margin-bottom: 24px;
}

.service-card__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.service-card__list-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-light);
}

.service-card__list-item svg {
  width: 16px;
  height: 16px;
  color: var(--color-success);
  flex-shrink: 0;
}

/* ---- Revenue Models ---- */
.revenue-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
}

.revenue-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  text-align: center;
  transition: all var(--transition);
}

.revenue-card:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.2);
  transform: translateY(-4px);
}

.revenue-card__icon {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  color: #fff;
}

.revenue-card__icon svg { width: 24px; height: 24px; }

.revenue-card h4 {
  font-size: 15px;
  color: #fff;
  margin-bottom: 8px;
}

.revenue-card p {
  font-size: 13px;
  color: rgba(255,255,255,0.55);
  line-height: 1.5;
}

/* ---- Team / Cases Section ---- */
.cases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
}

.case-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
}

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

.case-card__visual {
  height: 180px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.case-card__visual svg {
  width: 80px;
  height: 80px;
  color: rgba(255,255,255,0.3);
}

.case-card__visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 30% 40%, rgba(255,255,255,0.1), transparent 70%);
}

.case-card__badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 20px;
  letter-spacing: 0.5px;
  text-transform: uppercase;
}

.case-card__body {
  padding: 28px;
}

.case-card h3 {
  font-size: 18px;
  margin-bottom: 10px;
}

.case-card p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.65;
  margin-bottom: 20px;
}

.case-card__tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.case-tag {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-primary);
  background: rgba(0,82,212,0.08);
  padding: 3px 10px;
  border-radius: 20px;
}

/* ---- Stats Section ---- */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2px;
  background: var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.stat-item {
  background: #fff;
  padding: 40px 32px;
  text-align: center;
}

.stat-item__value {
  font-size: clamp(36px, 5vw, 56px);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-item__label {
  font-size: 14px;
  color: var(--color-text-light);
  font-weight: 500;
}

/* ---- Team Members ---- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
}

.team-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  transition: all var(--transition);
}

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

.team-card__avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.team-card__avatar svg { width: 36px; height: 36px; }

.team-card__initials {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 16px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
}

.team-card h3 {
  font-size: 17px;
  margin-bottom: 4px;
}

.team-card__role {
  font-size: 13px;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: 8px;
}

.team-card__bg {
  font-size: 13px;
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ---- Contact Section ---- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 64px;
  align-items: start;
}

.contact-info h2 {
  font-size: clamp(28px, 3.5vw, 40px);
  margin-bottom: 20px;
}

.contact-info > p {
  color: var(--color-text-light);
  font-size: 16px;
  line-height: 1.7;
  margin-bottom: 48px;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 28px;
}

.contact-detail__icon {
  width: 48px;
  height: 48px;
  background: rgba(0,82,212,0.08);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.contact-detail__icon svg { width: 22px; height: 22px; }

.contact-detail__label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}

.contact-detail__value {
  font-size: 15px;
  color: var(--color-text);
  font-weight: 500;
}

.contact-detail__value a {
  color: var(--color-text);
}
.contact-detail__value a:hover { color: var(--color-primary); }

/* ---- Contact Form ---- */
.contact-form {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 48px 40px;
  box-shadow: var(--shadow-md);
}

.contact-form h3 {
  font-size: 24px;
  margin-bottom: 8px;
}

.contact-form > p {
  color: var(--color-text-light);
  font-size: 14px;
  margin-bottom: 32px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 15px;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,82,212,0.12);
}

.form-group textarea { resize: vertical; min-height: 120px; }

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

.form-notice {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 16px;
  line-height: 1.6;
}

.form-notice a { color: var(--color-primary); }

/* ---- Footer ---- */
.footer {
  background: var(--color-bg-dark);
  color: rgba(255,255,255,0.7);
  padding: 80px 0 0;
}

.footer__top {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 64px;
}

.footer__brand p {
  font-size: 14px;
  line-height: 1.7;
  margin: 16px 0 24px;
  color: rgba(255,255,255,0.5);
}

.footer__social {
  display: flex;
  gap: 12px;
}

.footer__social-link {
  width: 40px;
  height: 40px;
  background: rgba(255,255,255,0.07);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.6);
  transition: all var(--transition);
}

.footer__social-link:hover {
  background: var(--color-primary);
  color: #fff;
}

.footer__social-link svg { width: 18px; height: 18px; }

.footer__col h4 {
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}

.footer__col ul { display: flex; flex-direction: column; gap: 10px; }

.footer__col ul li a {
  font-size: 14px;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}

.footer__col ul li a:hover { color: #fff; }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,0.07);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer__copy {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

.footer__legal {
  display: flex;
  gap: 24px;
}

.footer__legal a {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

.footer__legal a:hover { color: rgba(255,255,255,0.7); }

/* ---- Policy Pages ---- */
.policy-hero {
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  padding: 120px 0 64px;
  color: #fff;
  text-align: center;
}

.policy-hero h1 {
  color: #fff;
  font-size: clamp(28px, 4vw, 48px);
  margin-bottom: 12px;
}

.policy-hero p {
  color: rgba(255,255,255,0.7);
  font-size: 16px;
}

.policy-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 80px 24px;
}

.policy-content h2 {
  font-size: 24px;
  margin: 48px 0 16px;
  color: var(--color-primary-dark);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-border);
}

.policy-content h3 {
  font-size: 18px;
  margin: 32px 0 12px;
  color: var(--color-text);
}

.policy-content p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 16px;
}

.policy-content ul {
  list-style: disc;
  padding-left: 24px;
  margin-bottom: 16px;
}

.policy-content ul li {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.7;
  margin-bottom: 8px;
}

.policy-content .policy-highlight {
  background: rgba(0,82,212,0.06);
  border-left: 4px solid var(--color-primary);
  padding: 16px 20px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 24px 0;
  font-size: 14px;
  color: var(--color-text-light);
}

.policy-toc {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 24px 28px;
  margin-bottom: 48px;
}

.policy-toc h4 {
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--color-text);
}

.policy-toc ol {
  list-style: decimal;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.policy-toc ol li a {
  font-size: 14px;
  color: var(--color-primary);
}

/* ---- Mobile Nav ---- */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(0, 26, 110, 0.97);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}

.mobile-nav.open { display: flex; }

.mobile-nav__close {
  position: absolute;
  top: 20px;
  right: 24px;
  color: #fff;
  padding: 8px;
}

.mobile-nav__close svg { width: 28px; height: 28px; }

.mobile-nav a {
  font-size: 24px;
  font-weight: 600;
  color: rgba(255,255,255,0.85);
  padding: 8px 0;
  transition: color var(--transition);
}

.mobile-nav a:hover { color: #fff; }

/* ---- Scroll To Top ---- */
.scroll-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  background: var(--color-primary);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,82,212,0.4);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  z-index: 900;
  cursor: pointer;
}

.scroll-top.visible { opacity: 1; pointer-events: all; }
.scroll-top:hover { transform: translateY(-3px); box-shadow: 0 8px 28px rgba(0,82,212,0.5); }
.scroll-top svg { width: 20px; height: 20px; }

/* ---- Animations ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(30px); }
  to   { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.animate-fade-up {
  animation: fadeUp 0.7s ease forwards;
}

.animate-fade-up.delay-1 { animation-delay: 0.1s; }
.animate-fade-up.delay-2 { animation-delay: 0.2s; }
.animate-fade-up.delay-3 { animation-delay: 0.3s; }

[data-animate] { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
[data-animate].in-view { opacity: 1; transform: none; }

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .footer__top { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
}

@media (max-width: 768px) {
  :root { --nav-height: 64px; }
  .section { padding: 72px 0; }
  .nav__menu, .nav__cta { display: none; }
  .nav__toggle { display: flex; }
  .hero h1 { font-size: 36px; letter-spacing: -0.5px; }
  .hero__stats { gap: 28px; flex-wrap: wrap; }
  .footer__top { grid-template-columns: 1fr; gap: 32px; }
  .footer__bottom { flex-direction: column; align-items: flex-start; }
  .form-row { grid-template-columns: 1fr; }
  .services-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }
  .contact-form { padding: 32px 24px; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .revenue-grid { grid-template-columns: 1fr 1fr; }
}