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

:root {
  --primary: #13aed8;
  --primary-glow: rgba(19, 174, 216, 0.5);
  --bg-dark: #0a0a0a;
  --bg-darker: #050505;
  --bg-card: #141414;
  --bg-glass: rgba(20, 20, 20, 0.6);
  --text-main: #ffffff;
  --text-muted: #a0a0a0;
  --border-color: rgba(255, 255, 255, 0.1);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  
  --font-main: 'Outfit', sans-serif;
}

body.light-mode {
  --bg-dark: #f4f6f8;
  --bg-darker: #ffffff;
  --bg-card: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  --text-main: #1a1e23;
  --text-muted: #5c6b7a;
  --border-color: rgba(0, 0, 0, 0.1);
  --primary-glow: rgba(19, 174, 216, 0.2);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

/* Utils */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--text-muted); }

.section {
  padding: 6rem 0;
}

/* Animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

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

.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.8rem 2rem;
  border-radius: 50px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
  font-size: 1.1rem;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 0 15px var(--primary-glow);
}

.btn-primary:hover {
  background: transparent;
  border-color: var(--primary);
  color: var(--primary);
  box-shadow: 0 0 25px var(--primary-glow), inset 0 0 10px var(--primary-glow);
  transform: translateY(-2px);
}

.btn-outline {
  background: transparent;
  border-color: var(--text-main);
  color: var(--text-main);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Header & Nav */
header {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo span {
  color: var(--primary);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  font-weight: 500;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: -4px;
  left: 0;
  background-color: var(--primary);
  transition: var(--transition);
}

.nav-links a:hover::after, .nav-links a.active::after {
  width: 100%;
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-main);
  font-size: 1.5rem;
  cursor: pointer;
}

.btn-theme {
  background: transparent;
  border: none;
  font-size: 1.3rem;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-theme:hover {
  color: var(--primary);
  transform: scale(1.1);
}

/* Hero Section */
.hero {
  height: 300vh;
  position: relative;
  background: var(--bg-dark);
}

.hero-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 80px;
}

/* Decorative Orbs */
.hero::before, .hero::after {
  content: '';
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  z-index: 0;
}

.hero::before {
  top: -10%;
  left: -10%;
  width: 500px;
  height: 500px;
  background: rgba(19, 174, 216, 0.15);
}

.hero::after {
  bottom: -10%;
  right: -10%;
  width: 400px;
  height: 400px;
  background: rgba(100, 100, 255, 0.1);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  text-align: left;
}

.hero h1 {
  font-size: 4.5rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #ffffff, #a0a0a0);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero h1 .text-primary {
  background: none;
  -webkit-text-fill-color: var(--primary);
  color: var(--primary);
}

.hero h1 .cursor {
  background: none;
  -webkit-text-fill-color: var(--primary);
  color: var(--primary);
  animation: blink 0.75s step-end infinite;
  display: inline-block;
  margin-left: 2px;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.hero p {
  font-size: 1.25rem;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: flex-start;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 2.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-10px);
  border-color: var(--primary);
  box-shadow: 0 10px 30px rgba(0,0,0,0.5), 0 0 20px rgba(19, 174, 216, 0.1);
}

/* Subtle gradient top border for cards */
.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--primary), transparent);
  opacity: 0;
  transition: var(--transition);
}

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

.card-icon {
  font-size: 2.5rem;
  color: var(--primary);
  margin-bottom: 1.5rem;
  display: inline-block;
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.card p {
  color: var(--text-muted);
  font-size: 1rem;
}

/* Footer */
footer {
  background: var(--bg-darker);
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--border-color);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  font-size: 1.2rem;
  margin-bottom: 1.5rem;
  color: var(--text-main);
}

.footer-col ul li {
  margin-bottom: 0.8rem;
}

.footer-col ul li a {
  color: var(--text-muted);
}

.footer-col ul li a:hover {
  color: var(--primary);
}

.footer-bottom {
  text-align: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* Page Headers (for inner pages) */
.page-header {
  padding: 10rem 0 4rem;
  text-align: center;
  background: radial-gradient(circle at top, rgba(19,174,216,0.1), transparent 50%);
}

.page-header h1 {
  font-size: 3.5rem;
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 { font-size: 3rem; }
  .nav-links {
    position: fixed;
    top: 80px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 80px);
    background: var(--bg-darker);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
  }
  .nav-links.active { left: 0; }
  .mobile-menu-btn { display: block; }
  .page-header h1 { font-size: 2.5rem; }
}