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

/* ===== Header ===== */
.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: 66px; width: auto; }
.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: 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; }
.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); }

/* ===== 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;
}

/* ===== Buttons ===== */
.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); cursor: pointer; transition: all var(--transition);
  border: none; text-decoration: none; gap: 0.5rem;
}
.btn--primary { background: var(--color-primary); color: var(--color-white); box-shadow: var(--shadow-green); }
.btn--primary:hover { background: var(--color-primary-dark); transform: translateY(-2px); box-shadow: 0 12px 35px rgba(22,163,74,0.3); }
.btn--secondary { background: 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); }
.btn--lg { padding: 1rem 2.5rem; font-size: var(--font-size-lg); border-radius: var(--radius-lg); }

/* ===== Hero ===== */
.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: 580px; margin-left: auto; margin-right: auto; line-height: 1.7;
}
.hero__ctas { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); justify-content: center; }

@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; }

/* ===== About ===== */
.about { padding: var(--spacing-2xl) 0; }
.about__values { display: grid; grid-template-columns: 1fr; gap: var(--spacing-md); }
.value-card {
  text-align: center; padding: var(--spacing-lg);
  background: var(--color-white); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow); transition: all var(--transition);
}
.value-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: transparent; }
.value-card__icon {
  width: 48px; height: 48px; margin: 0 auto var(--spacing-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light); border-radius: var(--radius); color: var(--color-primary);
}
.value-card h3 { font-size: var(--font-size-lg); font-weight: 700; margin-bottom: var(--spacing-xs); }
.value-card p { font-size: var(--font-size-base); color: var(--color-text-light); line-height: 1.7; }

/* ===== Services ===== */
.services { padding: var(--spacing-2xl) 0; background: var(--color-bg-alt); }
.services__grid { display: grid; grid-template-columns: 1fr; gap: var(--spacing-md); }
.service-card {
  padding: var(--spacing-lg); background: var(--color-white);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); 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-primary), #4ade80); opacity: 0; transition: opacity var(--transition);
}
.service-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: transparent; }
.service-card:hover::before { opacity: 1; }
.service-card__icon {
  width: 48px; height: 48px; margin-bottom: var(--spacing-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light); border-radius: var(--radius); color: var(--color-primary);
}
.service-card h3 { font-size: var(--font-size-lg); font-weight: 700; margin-bottom: var(--spacing-xs); }
.service-card p { font-size: var(--font-size-base); color: var(--color-text-light); line-height: 1.7; }

/* ===== MeroDukaan Product Section ===== */
.merodukaan { padding: var(--spacing-2xl) 0; }
.merodukaan__header { text-align: center; margin-bottom: var(--spacing-xl); }
.merodukaan__badge {
  display: inline-block; font-size: var(--font-size-sm); font-weight: 600;
  color: var(--color-primary); background: var(--color-primary-light);
  padding: 6px 16px; border-radius: 100px; margin-bottom: var(--spacing-sm);
  letter-spacing: 0.03em; text-transform: uppercase;
}
.merodukaan__cta { text-align: center; margin-top: var(--spacing-xl); }

/* Screenshots */
.screenshot-gallery {
  display: flex; gap: var(--spacing-md); max-width: 720px; margin: 0 auto var(--spacing-xl);
  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; }
.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);
}
.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; }
.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; }

/* Feature Rows */
.merodukaan__features { max-width: 800px; margin: 0 auto; }
.feature-row {
  display: flex; gap: var(--spacing-md); padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-xs); border-radius: var(--radius-lg);
  transition: background var(--transition); align-items: flex-start;
}
.feature-row:hover { background: var(--color-bg-alt); }
.feature-row__icon {
  width: 44px; height: 44px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light); border-radius: var(--radius); color: var(--color-primary);
}
.feature-row__content { flex: 1; min-width: 0; }
.feature-row__title { font-size: var(--font-size-base); font-weight: 700; color: var(--color-text); margin-bottom: 2px; }
.feature-row__desc { font-size: var(--font-size-sm); color: var(--color-text-light); line-height: 1.6; }

/* ===== Why Nepexus ===== */
.why-nepexus { padding: var(--spacing-2xl) 0; background: var(--color-bg-alt); }
.why__grid { display: grid; grid-template-columns: 1fr; gap: var(--spacing-md); }
.why-card {
  padding: var(--spacing-lg); background: var(--color-white);
  border: 1px solid var(--color-border); border-radius: var(--radius-lg);
  box-shadow: var(--shadow); transition: all var(--transition);
}
.why-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); border-color: transparent; }
.why-card__icon {
  width: 44px; height: 44px; margin-bottom: var(--spacing-sm);
  display: flex; align-items: center; justify-content: center;
  background: var(--color-primary-light); border-radius: var(--radius); color: var(--color-primary);
}
.why-card h3 { font-size: var(--font-size-lg); font-weight: 700; margin-bottom: var(--spacing-xs); }
.why-card p { font-size: var(--font-size-base); color: var(--color-text-light); line-height: 1.7; }

/* ===== Contact ===== */
.contact {
  padding: var(--spacing-3xl) 0; text-align: center;
  background: linear-gradient(180deg, #ffffff 0%, #f0fdf4 100%); position: relative;
}
.contact__actions { display: flex; flex-wrap: wrap; gap: var(--spacing-sm); justify-content: center; }

/* ===== Footer ===== */
.site-footer { background: var(--color-text); color: rgba(255,255,255,0.8); padding: var(--spacing-2xl) 0 var(--spacing-lg); }

.footer__grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg);
  padding-bottom: var(--spacing-xl); border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer__brand { grid-column: 1 / -1; }
.footer__brand-name { font-size: var(--font-size-xl); font-weight: 800; color: #ffffff; margin-bottom: var(--spacing-xs); letter-spacing: -0.02em; }
.footer__tagline { font-size: var(--font-size-sm); color: rgba(255,255,255,0.5); margin-bottom: var(--spacing-md); line-height: 1.6; }

.footer__socials { display: flex; gap: var(--spacing-sm); }
.footer__socials a {
  width: 36px; height: 36px; display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.08); border-radius: 8px;
  color: rgba(255,255,255,0.6); transition: all var(--transition);
}
.footer__socials a:hover { background: rgba(255,255,255,0.15); color: #ffffff; transform: translateY(-2px); }

.footer__col { }
.footer__col-title { font-size: var(--font-size-sm); font-weight: 700; color: #ffffff; margin-bottom: var(--spacing-sm); text-transform: uppercase; letter-spacing: 0.05em; }
.footer__col ul { padding: 0; }
.footer__col li { margin-bottom: var(--spacing-xs); }
.footer__col a { font-size: var(--font-size-sm); color: rgba(255,255,255,0.5); transition: color var(--transition); }
.footer__col a:hover { color: #ffffff; }

.footer__bottom { padding-top: var(--spacing-lg); text-align: center; }
.footer__bottom p { font-size: var(--font-size-sm); color: rgba(255,255,255,0.35); }

/* ===== Desktop (768px+) ===== */
@media (min-width: 768px) {
  .container { padding: 0 var(--spacing-lg); }
  .nav__toggle { display: none; }
  .nav__logo img { height: 84px; }
  .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); }
  .about__values { grid-template-columns: repeat(3, 1fr); }
  .services__grid { grid-template-columns: repeat(3, 1fr); }
  .why__grid { grid-template-columns: repeat(2, 1fr); }
  .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; }
  .about, .services, .merodukaan, .why-nepexus { padding: var(--spacing-3xl) 0; }
  .footer__grid { grid-template-columns: 2fr 1fr 1fr 1fr; }
  .footer__brand { grid-column: auto; }
}

@media (min-width: 1024px) {
  .hero__headline { font-size: var(--font-size-4xl); max-width: 700px; margin-left: auto; margin-right: auto; }
  .why__grid { grid-template-columns: repeat(4, 1fr); }
}