/* ===== CSS Custom Properties ===== */
:root {
  --color-primary: #16A34A;
  --color-primary-dark: #15803d;
  --color-primary-light: #dcfce7;
  --color-text: #111827;
  --color-text-light: #6B7280;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F9FAFB;
  --color-border: #E5E7EB;
  --color-white: #ffffff;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2.25rem;
  --font-size-3xl: 3rem;
  --font-size-4xl: 3.75rem;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;
  --spacing-3xl: 8rem;

  --max-width: 1200px;
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
  --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);
  --shadow-green: 0 8px 30px rgba(22,163,74,0.2);
  --transition: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; }
ul { list-style: none; }

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ===== Sticky Header — Glassmorphism ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(229,231,235,0.6);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-sm) var(--spacing-md);
  min-height: 64px;
}

.nav__logo img { display: block; height: 84px; width: auto; }

/* Hamburger toggle */
.nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
}

.nav__hamburger,
.nav__hamburger::before,
.nav__hamburger::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: var(--transition);
}
.nav__hamburger { position: relative; }
.nav__hamburger::before, .nav__hamburger::after { content: ''; position: absolute; left: 0; }
.nav__hamburger::before { top: -6px; }
.nav__hamburger::after { top: 6px; }

/* Mobile nav */
.nav__links {
  display: none;
  position: absolute;
  top: 64px;
  left: 0;
  right: 0;
  background: rgba(255,255,255,0.97);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-sm) 0;
  flex-direction: column;
}
.nav__links.is-open { display: flex; }

.nav__links li a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-md);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition);
}
.nav__links li a:hover,
.nav__links li a.is-active { color: var(--color-primary); }

/* ===== Section Shared ===== */
.section-title {
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: var(--spacing-sm);
  text-align: center;
  letter-spacing: -0.02em;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.7;
}

/* ===== Hero — Gradient Background ===== */
.hero {
  text-align: center;
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 100%);
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(22,163,74,0.08) 0%, transparent 70%);
  pointer-events: none;
}

.hero__headline {
  font-size: var(--font-size-2xl);
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
  letter-spacing: -0.03em;
  position: relative;
}

.hero__subtext {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

/* ===== Buttons — Modern with shadow ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.75rem;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  text-decoration: none;
  gap: 0.5rem;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-green);
}
.btn--primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 35px rgba(22,163,74,0.3);
}

.btn--secondary {
  background-color: var(--color-white);
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
  box-shadow: var(--shadow);
}
.btn--secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--lg {
  padding: 1rem 2.5rem;
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

/* ===== Product Preview — Phone Mockup Style ===== */
.product-preview {
  padding: var(--spacing-2xl) 0 var(--spacing-3xl);
  background: linear-gradient(180deg, #ffffff 0%, #f0fdf4 50%, #ffffff 100%);
  position: relative;
  overflow: hidden;
}

.product-preview::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(22,163,74,0.05) 0%, transparent 60%);
  pointer-events: none;
}

.screenshot-gallery {
  display: flex;
  gap: var(--spacing-md);
  max-width: 720px;
  margin: 0 auto;
  align-items: center;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: var(--spacing-sm) 0;
  -webkit-overflow-scrolling: touch;
}

.screenshot-gallery__item {
  text-align: center;
  flex: 0 0 65%;
  scroll-snap-align: center;
  transition: transform var(--transition);
}

/* Phone frame smaller padding on mobile */
.screenshot-gallery__item .phone-frame {
  position: relative;
  background: #1a1a2e;
  border-radius: 28px;
  padding: 8px;
  box-shadow:
    0 20px 60px rgba(0,0,0,0.2),
    0 0 0 1px rgba(255,255,255,0.1) inset;
  transition: transform var(--transition), box-shadow var(--transition);
}

/* Notch */
.screenshot-gallery__item .phone-frame::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 35%;
  height: 16px;
  background: #1a1a2e;
  border-radius: 0 0 10px 10px;
  z-index: 2;
}

.screenshot-gallery__item .phone-frame img {
  width: 100%;
  height: auto;
  border-radius: 20px;
  display: block;
}

/* Center phone slightly larger */
.screenshot-gallery__item:nth-child(2) .phone-frame {
  transform: scale(1.08);
  box-shadow:
    0 30px 80px rgba(22,163,74,0.2),
    0 0 0 1px rgba(255,255,255,0.1) inset;
}

.screenshot-gallery__item .phone-frame:hover {
  transform: translateY(-8px);
  box-shadow:
    0 30px 80px rgba(0,0,0,0.25),
    0 0 0 1px rgba(255,255,255,0.1) inset;
}

.screenshot-gallery__item:nth-child(2) .phone-frame:hover {
  transform: scale(1.08) translateY(-8px);
}

.screenshot-gallery__item figcaption {
  margin-top: var(--spacing-md);
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* ===== Features — Modern Cards ===== */
.features {
  padding: var(--spacing-2xl) 0;
  background: var(--color-bg-alt);
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
}

.card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg) var(--spacing-md);
  box-shadow: var(--shadow);
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-primary), #4ade80);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: transparent;
}

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

.card__title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.card__description {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ===== What We Do ===== */
.what-we-do {
  padding: var(--spacing-2xl) 0;
  text-align: center;
}

.what-we-do .section-subtitle { margin-bottom: 0; }

/* ===== Why Nepexus ===== */
.why-nepexus {
  padding: var(--spacing-2xl) 0;
  background: var(--color-bg-alt);
}

/* ===== CTA Section — Gradient ===== */
.cta {
  padding: var(--spacing-3xl) 0;
  text-align: center;
  background: linear-gradient(180deg, #ffffff 0%, #f0fdf4 100%);
  position: relative;
}

.cta::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 300px;
  background: radial-gradient(ellipse, rgba(22,163,74,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.cta .section-title { position: relative; }
.cta .section-subtitle { margin-bottom: var(--spacing-lg); position: relative; }
.cta .btn { position: relative; }

/* ===== Footer ===== */
.site-footer {
  background-color: var(--color-text);
  color: var(--color-bg-alt);
  padding: var(--spacing-lg) 0;
  text-align: center;
}

.footer__email {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--spacing-xs);
}

.footer__socials {
  display: flex;
  justify-content: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
}

.footer__socials a {
  color: rgba(255,255,255,0.7);
  transition: color var(--transition), transform var(--transition);
}

.footer__socials a:hover {
  color: #ffffff;
  transform: translateY(-2px);
}

.footer__copyright {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.5);
}

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

.hero__headline,
.hero__subtext,
.hero__ctas {
  animation: fadeInUp 0.8s ease forwards;
}

.hero__subtext { animation-delay: 0.15s; }
.hero__ctas { animation-delay: 0.3s; }

/* ===== Desktop (768px+) ===== */
@media (min-width: 768px) {
  .container { padding: 0 var(--spacing-lg); }

  .nav__toggle { display: none; }
  .nav__links {
    display: flex;
    position: static;
    flex-direction: row;
    gap: var(--spacing-lg);
    border-bottom: none;
    padding: 0;
    background: none;
    backdrop-filter: none;
  }

  .hero { padding: var(--spacing-3xl) 0 var(--spacing-2xl); }
  .hero__headline { font-size: var(--font-size-4xl); }
  .section-title { font-size: var(--font-size-2xl); }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
  }

  .card-grid--three {
    grid-template-columns: repeat(3, 1fr);
  }

  .product-preview,
  .features,
  .what-we-do,
  .why-nepexus {
    padding: var(--spacing-3xl) 0;
  }

  /* Screenshot gallery: grid on desktop */
  .screenshot-gallery {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    overflow-x: visible;
    scroll-snap-type: none;
    gap: var(--spacing-lg);
  }

  .screenshot-gallery__item {
    flex: none;
  }

  .screenshot-gallery__item .phone-frame {
    border-radius: 36px;
    padding: 10px;
  }

  .screenshot-gallery__item .phone-frame::before {
    top: 10px;
    width: 40%;
    height: 20px;
    border-radius: 0 0 12px 12px;
  }

  .screenshot-gallery__item .phone-frame img {
    border-radius: 26px;
  }
}

/* ===== Large Desktop (1024px+) ===== */
@media (min-width: 1024px) {
  .hero__headline { font-size: var(--font-size-4xl); max-width: 700px; margin-left: auto; margin-right: auto; }
  .screenshot-gallery { gap: var(--spacing-xl); }
}