/* ===========================================
   NEXUS AI OCEAN INSTITUTE - GLOBAL VARIABLES
   =========================================== */
:root {
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Orbitron', 'Segoe UI', sans-serif;

  --color-bg-deep: #000814;
  --color-bg-mid: #001d3d;
  --color-bg-light: #003566;
  --color-ocean: #0077b6;
  --color-surface: rgba(0, 20, 40, 0.6);

  --color-accent: #00f0ff;
  --color-accent-dim: rgba(0, 240, 255, 0.12);
  --color-accent-glow: rgba(0, 240, 255, 0.5);
  --color-accent-glow-lg: rgba(0, 240, 255, 0.7);

  --color-text: #e6f7ff;
  --color-text-dim: #a8d0e6;
  --color-text-muted: #6b9aad;

  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --transition-base: 0.3s ease;
  --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-deep);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* ===========================================
   TYPOGRAPHY & UTILITIES
   =========================================== */
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.02em;
}

.section-title {
  font-size: clamp(1.8rem, 4.5vw, 3.2rem);
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}

.section-header {
  margin-bottom: var(--space-lg);
  max-width: 640px;
}

.section-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-dim);
  margin-top: var(--space-sm);
  font-weight: 300;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.section {
  padding: var(--space-xl) 0;
  position: relative;
}

/* ===========================================
   GLASSMORPHISM COMPONENTS
   =========================================== */
.glass-panel {
  background: var(--color-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(0, 240, 255, 0.12);
  border-radius: var(--radius-md);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  transition:
    transform var(--transition-base),
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

.glass-panel:hover {
  border-color: rgba(0, 240, 255, 0.3);
  box-shadow:
    0 12px 40px rgba(0, 0, 0, 0.45),
    0 0 24px rgba(0, 240, 255, 0.08);
}

/* ===========================================
   BUTTONS
   =========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  padding: 1rem 2.5rem;
  font-family: var(--font-display);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
}

.btn-neon {
  background: var(--color-accent);
  color: var(--color-bg-deep);
  box-shadow:
    0 0 20px var(--color-accent-glow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.25);
}

.btn-neon:hover {
  box-shadow:
    0 0 40px var(--color-accent-glow-lg),
    0 0 60px var(--color-accent-glow);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

/* ===========================================
   NAVIGATION
   =========================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  transition: background var(--transition-base), backdrop-filter var(--transition-base);
}

.header.scrolled {
  background: rgba(0, 8, 20, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-accent-dim);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.25rem var(--space-md);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--color-text);
}

.logo-icon {
  color: var(--color-accent);
  filter: drop-shadow(0 0 8px var(--color-accent-glow));
}

.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: 0.04em;
}

.logo-accent {
  color: var(--color-accent);
  margin-left: 2px;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: var(--space-md);
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-dim);
  transition: color var(--transition-base), text-shadow var(--transition-base);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
  box-shadow: 0 0 8px var(--color-accent);
}

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

.nav-link:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.hamburger {
  display: block;
  width: 28px;
  height: 2px;
  background: var(--color-text);
  position: relative;
  transition: background var(--transition-base);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 28px;
  height: 2px;
  background: var(--color-text);
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

.nav-toggle.active .hamburger {
  background: transparent;
}

.nav-toggle.active .hamburger::before {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle.active .hamburger::after {
  transform: translateY(-8px) rotate(-45deg);
}

/* ===========================================
   HERO SECTION
   =========================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: radial-gradient(ellipse at bottom, var(--color-bg-mid) 0%, var(--color-bg-deep) 65%);
}

.particle-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero-gradient-bottom {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 180px;
  background: linear-gradient(to top, var(--color-bg-deep), transparent);
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 900px;
  padding: var(--space-md);
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  border: 1px solid var(--color-accent-dim);
  padding: 0.5rem 1.2rem;
  border-radius: 100px;
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  box-shadow: 0 0 12px var(--color-accent-dim);
}

.hero-title {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  margin-bottom: var(--space-md);
  text-shadow: 0 0 50px rgba(0, 240, 255, 0.2);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--color-text-dim);
  max-width: 640px;
  margin: 0 auto var(--space-lg);
  line-height: 1.7;
  font-weight: 300;
}

/* Drones */
.drone {
  position: absolute;
  width: 64px;
  height: 28px;
  background: rgba(0, 240, 255, 0.06);
  border: 1px solid rgba(0, 240, 255, 0.35);
  border-radius: 4px;
  z-index: 1;
  pointer-events: none;
}

.drone::before,
.drone::after {
  content: '';
  position: absolute;
  top: -5px;
  width: 14px;
  height: 14px;
  background: rgba(0, 240, 255, 0.5);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.drone::before {
  left: 6px;
}

.drone::after {
  right: 6px;
}

.drone-1 {
  top: 18%;
  left: -100px;
  animation: flyAcross 22s linear infinite;
}

.drone-2 {
  top: 62%;
  left: -120px;
  animation: flyAcross 28s linear infinite 6s;
}

@keyframes flyAcross {
  0% {
    transform: translateX(0) translateY(0);
    opacity: 0;
  }
  8% {
    opacity: 1;
  }
  92% {
    opacity: 1;
  }
  100% {
    transform: translateX(calc(100vw + 200px)) translateY(-30px);
    opacity: 0;
  }
}

/* Dashboard */
.hero-dashboard {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
}

.dash-panel {
  position: absolute;
  padding: var(--space-sm) var(--space-md);
  min-width: 150px;
}

.panel-1 {
  top: 22%;
  right: 8%;
}

.panel-2 {
  bottom: 28%;
  left: 8%;
}

.panel-3 {
  top: 45%;
  right: 5%;
}

.dash-metric {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: var(--color-accent);
  margin-bottom: 0.25rem;
}

.dash-label {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Scroll Indicator */
.scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% {
    opacity: 0.4;
    transform: scaleY(1);
  }
  50% {
    opacity: 1;
    transform: scaleY(1.2);
  }
}

/* ===========================================
   SYSTEMS / ABOUT SECTION
   =========================================== */
.systems {
  background: linear-gradient(to bottom, var(--color-bg-deep), var(--color-bg-mid));
}

.systems-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.systems-content p {
  font-size: 1.05rem;
  color: var(--color-text-dim);
  line-height: 1.8;
  margin-bottom: var(--space-md);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--color-accent);
  display: block;
  text-shadow: 0 0 20px var(--color-accent-glow);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--color-text-dim);
  line-height: 1.4;
}

/* Sonar Visual */
.systems-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.sonar-container {
  position: relative;
  width: 280px;
  height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sonar-ring {
  position: absolute;
  border-radius: 50%;
  border: 2px solid var(--color-accent-dim);
  animation: sonarPulse 4s ease-out infinite;
}

.sonar-ring:nth-child(1) {
  width: 100%;
  height: 100%;
  animation-delay: 0s;
}

.sonar-ring:nth-child(2) {
  width: 75%;
  height: 75%;
  animation-delay: 1.3s;
}

.sonar-ring:nth-child(3) {
  width: 50%;
  height: 50%;
  animation-delay: 2.6s;
}

@keyframes sonarPulse {
  0% {
    transform: scale(0.8);
    opacity: 0.8;
    border-color: var(--color-accent);
  }
  100% {
    transform: scale(1.2);
    opacity: 0;
    border-color: var(--color-accent-dim);
  }
}

.sonar-center {
  width: 48px;
  height: 48px;
  background: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 35px var(--color-accent-glow);
  color: var(--color-bg-deep);
  z-index: 2;
}

/* ===========================================
   PROGRAMS SECTION
   =========================================== */
.programs {
  background: linear-gradient(to bottom, var(--color-bg-mid), var(--color-bg-deep));
}

.programs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-md);
}

.program-card {
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.program-card h3 {
  font-size: 1.2rem;
  color: var(--color-accent);
  text-transform: uppercase;
}

.program-card p {
  font-size: 0.95rem;
  color: var(--color-text-dim);
  line-height: 1.7;
  flex: 1;
}

.card-icon {
  color: var(--color-accent);
  opacity: 0.9;
}

.card-features {
  list-style: none;
  margin-top: auto;
}

.card-features li {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 0.4rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.card-features li:last-child {
  border-bottom: none;
}

.card-features li::before {
  content: '›';
  color: var(--color-accent);
  margin-right: 0.5rem;
  font-weight: 700;
}

/* ===========================================
   OCEAN LAB SECTION
   =========================================== */
.lab {
  background: linear-gradient(to bottom, var(--color-bg-deep), var(--color-bg-mid));
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-md);
}

.lab-card {
  padding: var(--space-md);
  position: relative;
  overflow: hidden;
}

.lab-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
  opacity: 0.6;
}

.lab-category {
  display: inline-block;
  font-size: 0.75rem;
  font-family: var(--font-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.lab-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-sm);
  text-transform: uppercase;
}

.lab-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.lab-meta-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.meta-label {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-display);
}

.meta-value {
  font-size: 0.9rem;
  color: var(--color-text-dim);
  line-height: 1.5;
}

/* ===========================================
   CONTACT SECTION
   =========================================== */
.contact {
  background: linear-gradient(to bottom, var(--color-bg-mid), var(--color-bg-deep));
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.contact-info p {
  color: var(--color-text-dim);
  line-height: 1.8;
  margin-top: var(--space-sm);
}

.contact-details {
  margin-top: var(--space-md);
  font-style: normal;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.contact-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.contact-item a,
.contact-item span:last-child {
  color: var(--color-text);
  font-size: 1rem;
  transition: color var(--transition-base), text-shadow var(--transition-base);
}

.contact-item a:hover {
  color: var(--color-accent);
  text-shadow: 0 0 10px var(--color-accent-glow);
}

/* Form */
.contact-form-wrapper {
  padding: var(--space-md);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.form-group input,
.form-group select,
.form-group textarea {
  background: rgba(0, 10, 20, 0.5);
  border: 1px solid rgba(0, 240, 255, 0.15);
  border-radius: var(--radius-sm);
  padding: 0.875rem 1rem;
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  outline: none;
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.7;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2300f0ff' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

.form-group select option {
  background: var(--color-bg-deep);
  color: var(--color-text);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-dim);
}

.form-status {
  margin-top: var(--space-xs);
  font-size: 0.9rem;
  min-height: 1.5rem;
  color: var(--color-accent);
}

/* Map */
.map-container {
  position: relative;
  width: 100%;
  height: 400px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(0, 240, 255, 0.15);
}

#holoMap {
  width: 100%;
  height: 100%;
  display: block;
  background: var(--color-bg-mid);
}

.map-overlay {
  position: absolute;
  top: var(--space-sm);
  left: var(--space-sm);
  background: rgba(0, 8, 20, 0.7);
  border: 1px solid var(--color-accent-dim);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
}

.map-badge {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  text-transform: uppercase;
}

/* ===========================================
   FOOTER
   =========================================== */
.footer {
  border-top: 1px solid rgba(0, 240, 255, 0.08);
  padding: var(--space-md) 0;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.footer p + p {
  margin-top: 0.25rem;
}

/* ===========================================
   SCROLL REVEAL ANIMATIONS
   =========================================== */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s ease-out, transform 0.9s ease-out;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================================
   RESPONSIVE DESIGN
   =========================================== */
@media (max-width: 1024px) {
  .panel-3 {
    display: none;
  }
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-menu {
    position: fixed;
    inset: 0 0 0 auto;
    width: 75%;
    max-width: 300px;
    background: rgba(0, 8, 20, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 6rem var(--space-md);
    gap: var(--space-md);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    display: flex;
    list-style: none;
    border-left: 1px solid var(--color-accent-dim);
    z-index: 999;
  }

  .nav-menu.active {
    transform: translateX(0);
  }

  .systems-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }

  .systems-visual {
    order: -1;
    margin-bottom: var(--space-md);
  }

  .map-container {
    height: 300px;
  }

  .dash-panel {
    display: none;
  }

  .stats-grid {
    gap: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .programs-grid,
  .lab-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    font-size: 2rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .contact-form-wrapper {
    padding: var(--space-sm);
  }
}

/* ===========================================
   REDUCED MOTION
   =========================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}