/* ===== CSS Variables & Design Tokens ===== */
:root {
  --color-bg: #0a0e1a;
  --color-bg-alt: #0f1423;
  --color-surface: #141929;
  --color-surface-hover: #1a2035;
  --color-primary: #00d4ff;
  --color-primary-dark: #00a8cc;
  --color-accent: #7b61ff;
  --color-accent-light: #a18aff;
  --color-text: #e8eaf6;
  --color-text-secondary: #8892b0;
  --color-text-muted: #5a6380;
  --color-border: rgba(255, 255, 255, 0.06);
  --color-glass: rgba(20, 25, 41, 0.65);
  --color-glass-border: rgba(0, 212, 255, 0.12);
  --font-heading: 'Outfit', sans-serif;
  --font-body: 'Inter', sans-serif;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

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

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  backdrop-filter: blur(0px);
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 10px 0;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.4rem;
}

.logo-icon {
  font-size: 1.6rem;
  filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.5));
}

.logo-text {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-link {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: rgba(0, 212, 255, 0.08);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

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

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.05);
  animation: heroZoom 20s ease-in-out infinite alternate;
}

@keyframes heroZoom {
  from { transform: scale(1.05); }
  to { transform: scale(1.15); }
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    180deg,
    rgba(10, 14, 26, 0.4) 0%,
    rgba(10, 14, 26, 0.6) 40%,
    rgba(10, 14, 26, 0.85) 80%,
    rgba(10, 14, 26, 1) 100%
  );
}

.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 50%;
  opacity: 0;
  animation: particleFloat linear infinite;
  box-shadow: 0 0 6px var(--color-primary);
}

@keyframes particleFloat {
  0% { opacity: 0; transform: translateY(100vh) scale(0); }
  10% { opacity: 0.8; }
  90% { opacity: 0.8; }
  100% { opacity: 0; transform: translateY(-10vh) scale(1); }
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 24px;
}

.hero-subtitle {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 400;
  letter-spacing: 6px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 8vw, 6rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #ffffff 30%, var(--color-primary) 70%, var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 40px rgba(0, 212, 255, 0.2));
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto 36px;
  line-height: 1.8;
}

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

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 212, 255, 0.5);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-glass-border);
  backdrop-filter: blur(10px);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  background: rgba(0, 212, 255, 0.08);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
}

/* ===== Scroll Indicator ===== */
.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  letter-spacing: 3px;
  text-transform: uppercase;
}

.scroll-arrow {
  width: 20px;
  height: 32px;
  border: 2px solid var(--color-text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-arrow::before {
  content: '';
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--color-primary);
  border-radius: 2px;
  animation: scrollDot 2s ease-in-out infinite;
}

@keyframes scrollDot {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
  50% { transform: translateX(-50%) translateY(10px); opacity: 0.3; }
}

/* ===== Section Styles ===== */
.section {
  padding: 100px 0;
}

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

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

.section-label {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--color-text);
}

.section-divider {
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  margin: 20px auto 0;
  border-radius: 2px;
}

/* ===== Glass Card ===== */
.glass-card {
  background: var(--color-glass);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-md);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}

.glass-card:hover {
  border-color: rgba(0, 212, 255, 0.25);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

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

.about-card {
  padding: 40px 32px;
  text-align: center;
}

.about-icon {
  font-size: 2.8rem;
  margin-bottom: 20px;
  filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.3));
}

.about-card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 14px;
  color: var(--color-text);
}

.about-card p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ===== Research Section ===== */
.research-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 28px;
}

.research-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.research-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  opacity: 0;
  transition: var(--transition);
}

.research-card:hover {
  border-color: var(--color-glass-border);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}

.research-card:hover::before {
  opacity: 1;
}

.research-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.15), rgba(123, 97, 255, 0.1));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 16px;
}

.research-card h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 12px;
}

.research-card p {
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 20px;
}

.research-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 500;
  background: rgba(0, 212, 255, 0.08);
  color: var(--color-primary);
  border: 1px solid rgba(0, 212, 255, 0.15);
}

/* ===== Tools Section ===== */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 20px;
}

.tool-item {
  padding: 28px 16px;
  text-align: center;
  cursor: default;
}

.tool-icon {
  font-size: 2.2rem;
  margin-bottom: 12px;
}

.tool-name {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text-secondary);
}

.tool-item:hover .tool-name {
  color: var(--color-primary);
}

/* ===== Web App Section ===== */
.app-description {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 700px;
  margin: 20px auto 0;
  text-align: center;
}

.app-container {
  position: relative;
  width: 100%;
  padding: 0;
  overflow: hidden;
  border-radius: var(--radius-lg);
}

.app-container iframe {
  width: 100%;
  height: 750px;
  border: none;
  display: block;
  background: #0f1423;
}

.app-fallback {
  display: none;
  text-align: center;
  padding: 40px 20px;
  color: var(--color-text-secondary);
}

.app-fallback.visible {
  display: block;
}

.app-link {
  color: var(--color-primary);
  text-decoration: underline;
  font-weight: 500;
}

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

@media (max-width: 768px) {
  .app-container iframe {
    height: 600px;
  }
}

/* ===== Stats Section ===== */
.stats-section {
  padding: 80px 0;
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.03), rgba(123, 97, 255, 0.03));
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  text-align: center;
}

.stat-item {
  padding: 20px;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-unit {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-text-muted);
  margin-left: 4px;
}

.stat-label {
  display: block;
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

/* ===== Contact Section ===== */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
}

.contact-form {
  padding: 40px;
}

.form-group {
  margin-bottom: 24px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 14px 18px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 0.95rem;
  transition: var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

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

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

/* ===== Footer ===== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.1rem;
}

.footer-text {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

/* ===== Animations ===== */
.animate-in {
  opacity: 0;
  transform: translateY(30px);
  animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.15s; }
.delay-2 { animation-delay: 0.3s; }
.delay-3 { animation-delay: 0.45s; }
.delay-4 { animation-delay: 0.6s; }

@keyframes fadeInUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

[data-reveal] {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

[data-reveal].revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 26, 0.95);
    backdrop-filter: blur(20px);
    padding: 16px 24px;
    border-bottom: 1px solid var(--color-border);
  }

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

  .nav-toggle {
    display: flex;
  }

  .hero-desc br {
    display: none;
  }

  .about-grid,
  .research-grid {
    grid-template-columns: 1fr;
  }

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

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

  .contact-form {
    padding: 28px 20px;
  }

  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}