@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap");

/* ═══════════════════════════════════════════
   Design Tokens
   ═══════════════════════════════════════════ */
:root {
  --color-accent: #f59e0b;
  --color-accent-hover: #d97706;
  --color-accent-light: rgba(245, 158, 11, 0.1);
  --color-dark: #0f172a;
  --color-dark-2: #1e293b;
  --color-text: #334155;
  --color-text-muted: #64748b;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-dark: #0f172a;
  --color-border: #e2e8f0;
  --font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.12);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ═══════════════════════════════════════════
   Base Reset
   ═══════════════════════════════════════════ */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

/* ═══════════════════════════════════════════
   Scroll Reveal System
   ═══════════════════════════════════════════ */
.reveal {
  opacity: 0;
  transition: opacity 0.8s ease, transform 0.8s ease;
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.reveal-up {
  transform: translateY(40px);
}

.reveal.reveal-left {
  transform: translateX(-40px);
}

.reveal.reveal-right {
  transform: translateX(40px);
}

.reveal.revealed {
  opacity: 1;
  transform: translate(0, 0);
}

/* ═══════════════════════════════════════════
   Navigation
   ═══════════════════════════════════════════ */
#mainNav {
  padding: 16px 0;
  transition: all var(--transition);
  background: transparent;
  z-index: 1000;
}

#mainNav.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: 8px 0;
  box-shadow: var(--shadow-md);
}

#mainNav .navbar-brand img {
  transition: all var(--transition);
}

#mainNav.scrolled .navbar-brand img {
  width: 140px;
  height: auto;
}

.navbar-nav .nav-link {
  color: var(--color-dark);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 8px 18px !important;
  border-radius: var(--radius-xl);
  transition: all var(--transition);
  position: relative;
}

.navbar-nav .nav-link::after {
  content: "";
  position: absolute;
  bottom: 2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: all var(--transition);
  transform: translateX(-50%);
  border-radius: 2px;
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
  width: 60%;
}

.navbar-nav .nav-link:hover {
  color: var(--color-accent);
}

.navbar-nav .nav-link.active {
  color: var(--color-accent);
  font-weight: 600;
}

.navbar-toggler {
  border: none;
  padding: 8px;
}

.navbar-toggler:focus {
  box-shadow: none;
}

/* ═══════════════════════════════════════════
   Hero Section
   ═══════════════════════════════════════════ */
.hero-section {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url("img/hero-bg-1.png");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  overflow: hidden;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
      rgba(255, 255, 255, 0.85) 0%,
      rgba(255, 255, 255, 0.7) 50%,
      rgba(255, 255, 255, 0.6) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
}

.hero-logo {
  margin-bottom: 2rem;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 1.25rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.text-accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 680px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
  font-weight: 400;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.hero-scroll-indicator a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--color-accent);
  font-size: 1.4rem;
  animation: bounce 2s ease-in-out infinite;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.6);
  backdrop-filter: blur(8px);
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(10px);
  }
}

/* ── Section scroll hint (reusable bounce arrow) ── */
.scroll-hint {
  text-align: center;
  padding-top: 48px;
}

.scroll-hint a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  color: var(--color-accent);
  font-size: 1.4rem;
  animation: bounce 2s ease-in-out infinite;
  text-decoration: none;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}

.scroll-hint a:hover {
  box-shadow: var(--shadow-md);
}

/* ═══════════════════════════════════════════
   Buttons
   ═══════════════════════════════════════════ */
.btn {
  font-family: var(--font-family);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 12px 28px;
  border-radius: var(--radius-xl);
  transition: all var(--transition);
  letter-spacing: 0.01em;
}

.btn-accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  color: #fff;
  border: none;
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.btn-accent:hover {
  background: linear-gradient(135deg, var(--color-accent-hover) 0%, #b45309 100%);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
}

.btn-outline-light {
  color: var(--color-dark);
  border: 2px solid var(--color-accent);
  background: transparent;
}

.btn-outline-light:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}

/* ═══════════════════════════════════════════
   Section Common Styles
   ═══════════════════════════════════════════ */
.section-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.section-badge {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
  font-weight: 600;
  font-size: 0.8rem;
  padding: 6px 18px;
  border-radius: var(--radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 800;
  color: var(--color-dark);
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ═══════════════════════════════════════════
   Services Section
   ═══════════════════════════════════════════ */
.section-services {
  padding: 100px 0;
  background: var(--color-bg);
}

.service-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 24px;
  text-align: center;
  height: 100%;
  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-accent), var(--color-accent-hover));
  transform: scaleX(0);
  transition: transform var(--transition);
  transform-origin: left;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
  border-color: transparent;
}

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

.service-icon {
  width: 140px;
  height: 140px;
  margin: 0 auto 20px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.service-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: transform var(--transition);
}

.service-card:hover .service-icon img {
  transform: scale(1.15);
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.service-card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.7;
}

.service-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
  transition: all var(--transition);
}

.service-link:hover {
  color: var(--color-accent-hover);
  gap: 10px;
}

/* Feature List */
.feature-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.feature-list li {
  padding: 8px 0;
  font-size: 0.95rem;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-list i {
  color: var(--color-accent);
  font-size: 1.1rem;
}

/* ═══════════════════════════════════════════
   Research Section
   ═══════════════════════════════════════════ */
.section-research {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.research-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  height: 100%;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

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

.research-tag {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
  font-weight: 600;
  font-size: 0.72rem;
  padding: 4px 12px;
  border-radius: var(--radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
  width: fit-content;
}

.research-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 10px;
  line-height: 1.4;
}

.research-card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  flex-grow: 1;
}

.research-meta {
  display: flex;
  gap: 16px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  padding-top: 14px;
  margin-top: 14px;
  border-top: 1px solid var(--color-border);
}

.research-meta span {
  display: flex;
  align-items: center;
}

/* Stats */
.stat-card {
  text-align: center;
  padding: 28px 16px;
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.stat-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: 6px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-weight: 500;
}

/* ═══════════════════════════════════════════
   About Section
         ═══════════════════════════════════════════ */
.section-about {
  padding: 100px 0;
  background-color: var(--color-bg);
  background-image: linear-gradient(to right, rgba(255, 255, 255, 1) 20%, rgba(255, 255, 255, 0.7) 45%, rgba(255, 255, 255, 0) 70%), url("img/network_map_v4.svg");

  background-size: 320%;
  background-position: right center;
  background-repeat: no-repeat;
  position: relative;
}

.about-highlights {
  margin-top: 2rem;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 0;
}

.highlight-item i {
  font-size: 1.5rem;
  color: var(--color-accent);
  margin-top: 2px;
}

.highlight-item strong {
  display: block;
  font-size: 0.95rem;
  color: var(--color-dark);
  margin-bottom: 2px;
}

.highlight-item p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

.about-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 400px;
  /* Space for the background map details to be prominent */
}

.about-card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 500px;
}

.about-mini-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 32px 16px;
  text-align: center;
  transition: all var(--transition);
}

.about-mini-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}

.about-mini-card i {
  font-size: 2.6rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: 12px;
}

.about-mini-card span {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-dark);
}

/* ═══════════════════════════════════════════
   Contact Section
   ═══════════════════════════════════════════ */
.section-contact {
  padding: 100px 0;
  background: var(--color-bg-alt);
}

.contact-info-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  height: 100%;
}

.contact-info-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 0;
}

.contact-info-item+.contact-info-item {
  border-top: 1px solid var(--color-border);
}

.contact-icon {
  width: 48px;
  height: 48px;
  min-width: 48px;
  border-radius: var(--radius-md);
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact-icon i {
  font-size: 1.2rem;
  color: var(--color-accent);
}

.contact-info-item h5 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-dark);
  margin-bottom: 2px;
}

.contact-info-item p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin: 0;
}

.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px;
}

.contact-form .form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-dark);
}

.contact-form .form-control {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  font-size: 0.9rem;
  font-family: var(--font-family);
  transition: all var(--transition);
}

.contact-form .form-control:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

/* ═══════════════════════════════════════════
   Footer
   ═══════════════════════════════════════════ */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 60px 0 30px;
}

.footer-logo {
  margin-bottom: 16px;
  filter: none;
}

.footer-desc {
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.footer-heading {
  color: var(--color-dark);
  font-weight: 700;
  font-size: 0.8rem;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.footer-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--color-text-muted);
  font-size: 0.88rem;
  text-decoration: none;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
}

.footer-links a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.footer-divider {
  border-color: var(--color-border);
  margin: 30px 0 20px;
}

.footer-copy {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin: 0;
}

/* ═══════════════════════════════════════════
   Back to Top
   ═══════════════════════════════════════════ */
.back-to-top {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  color: white;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
  box-shadow: 0 4px 14px rgba(245, 158, 11, 0.35);
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(245, 158, 11, 0.4);
}

/* ═══════════════════════════════════════════
   Hero Value Cards (index2)
   ═══════════════════════════════════════════ */
.hero-value-card {
  background: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  height: 100%;
  transition: all var(--transition);
}

.hero-value-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  background: rgba(255, 255, 255, 0.9);
}

.hero-value-card .hero-value-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.hero-value-card .hero-value-icon i {
  font-size: 1.5rem;
  color: var(--color-accent);
}

.hero-value-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.hero-value-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin: 0;
}

/* ═══════════════════════════════════════════
   Service Icon Circles (index2)
   ═══════════════════════════════════════════ */
.service-icon-circle {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent-light), rgba(245, 158, 11, 0.18));
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  transition: all var(--transition);
}

.service-icon-circle i {
  font-size: 1.6rem;
  color: var(--color-accent);
  transition: all var(--transition);
}

.service-card:hover .service-icon-circle {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-hover));
  transform: scale(1.08);
}

.service-card:hover .service-icon-circle i {
  color: #fff;
}

/* ═══════════════════════════════════════════
   Portfolio Section
   ═══════════════════════════════════════════ */
.section-portfolio {
  padding: 100px 0;
  background: var(--color-bg);
}

.portfolio-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 100%;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

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

.portfolio-img-wrapper {
  width: 100%;
  height: 220px;
  overflow: hidden;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.portfolio-img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  transition: transform 0.5s ease;
}

.portfolio-card:hover .portfolio-img {
  transform: scale(1.06);
}

.portfolio-body {
  padding: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.portfolio-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.portfolio-tag {
  display: inline-block;
  background: var(--color-accent-light);
  color: var(--color-accent-hover);
  font-weight: 600;
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: var(--radius-xl);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.portfolio-body h4 {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.portfolio-body p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin: 0;
}

/* ═══════════════════════════════════════════
   Team Cards
   ═══════════════════════════════════════════ */
.team-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 28px;
  text-align: center;
  height: 100%;
  transition: all var(--transition);
}

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

.team-avatar {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  overflow: hidden;
  margin: 0 auto 20px;
  border: 3px solid var(--color-accent);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.2);
}

.team-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

.team-card:hover .team-avatar img {
  transform: scale(1.08);
}

.team-avatar-placeholder {
  width: 100%;
  height: 100%;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
}

.team-avatar-placeholder i {
  font-size: 3rem;
  color: var(--color-text-muted);
}

.team-card h4 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.team-role {
  display: inline-block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.team-card p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.team-socials {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 14px;
}

.team-socials a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--transition);
}

.team-socials a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
  transform: translateY(-2px);
}

/* ═══════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════ */
@media (max-width: 991px) {
  .navbar-collapse {
    background: rgba(255, 255, 255, 0.98);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-top: 12px;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
  }

  .navbar-nav .nav-link {
    padding: 10px 16px !important;
  }

  .about-card-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 100%;
    margin-top: 2rem;
  }

  .portfolio-img-wrapper {
    height: 180px;
  }
}

@media (max-width: 768px) {
  .hero-title {
    font-size: 1.8rem;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .hero-buttons .btn {
    width: 100%;
    max-width: 320px;
  }

  .section-services,
  .section-research,
  .section-about,
  .section-contact,
  .section-portfolio {
    padding: 64px 0;
  }

  .about-card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-card {
    margin-bottom: 16px;
  }

  .portfolio-img-wrapper {
    height: 160px;
  }

  .team-avatar {
    width: 100px;
    height: 100px;
  }
}

@media (max-width: 480px) {
  .about-card-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .about-mini-card {
    padding: 16px 10px;
  }

  .contact-form {
    padding: 24px;
  }

  .hero-value-card {
    padding: 20px 16px;
  }

  .portfolio-img-wrapper {
    height: 140px;
    padding: 12px;
  }
}

/* ═══════════════════════════════════════════
   Complex System Animation
   ═══════════════════════════════════════════ */
.arch-animation-container {
  width: 100%;
  aspect-ratio: 4/3;
  background: var(--color-bg-dark);
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.arch-center {
  position: absolute;
  width: 80px;
  height: 80px;
  background: rgba(245, 158, 11, 0.1);
  border: 2px solid var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  box-shadow: 0 0 30px rgba(245, 158, 11, 0.4);
  animation: pulse-center 3s infinite ease-in-out;
}

.arch-center i {
  font-size: 2.2rem;
  color: var(--color-accent);
}

@keyframes pulse-center {

  0%,
  100% {
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
    transform: scale(1);
  }

  50% {
    box-shadow: 0 0 50px rgba(245, 158, 11, 0.6);
    transform: scale(1.05);
  }
}

.arch-node {
  position: absolute;
  width: 50px;
  height: 50px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  color: #fff;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.arch-node-1 {
  top: 20%;
  left: 15%;
}

.arch-node-2 {
  top: 75%;
  left: 20%;
}

.arch-node-3 {
  top: 25%;
  left: 80%;
}

.arch-node-4 {
  top: 80%;
  left: 75%;
}

.arch-line {
  position: absolute;
  background: rgba(255, 255, 255, 0.1);
  transform-origin: 0 50%;
  z-index: 1;
  height: 1px;
}

.arch-path-1 {
  top: calc(20% + 25px);
  left: calc(15% + 25px);
  width: 42%;
  transform: rotate(38deg);
}

.arch-path-2 {
  top: calc(75% + 25px);
  left: calc(20% + 25px);
  width: 38%;
  transform: rotate(-38deg);
}

.arch-path-3 {
  top: calc(25% + 25px);
  left: calc(80% + 25px);
  width: 38%;
  transform: rotate(140deg);
}

.arch-path-4 {
  top: calc(80% + 25px);
  left: calc(75% + 25px);
  width: 40%;
  transform: rotate(-130deg);
}

.arch-data-dot {
  position: absolute;
  top: -2.5px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-accent), 0 0 20px var(--color-accent);
  z-index: 6;
  opacity: 0;
  animation: flow-data 3s linear infinite;
  animation-delay: var(--delay);
}

@keyframes flow-data {
  0% {
    left: 5%;
    opacity: 0;
  }

  10% {
    opacity: 1;
  }

  90% {
    opacity: 1;
  }

  100% {
    left: 95%;
    opacity: 0;
  }
}