/* ==========================================================================
   GVK Software — styles
   Mobile-first, dark theme landing page
   ========================================================================== */

:root {
  --color-bg: #06080d;
  --color-bg-elevated: #0c0f16;
  --color-surface: #12161f;
  --color-surface-hover: #181d28;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.14);
  --color-text: #eef1f6;
  --color-text-muted: #939aab;
  --color-text-subtle: #6b7280;
  --color-accent: #3ddc84;
  --color-accent-dim: rgba(61, 220, 132, 0.14);
  --color-accent-glow: rgba(61, 220, 132, 0.35);
  --gradient-hero: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(61, 220, 132, 0.12), transparent 55%),
    radial-gradient(ellipse 60% 40% at 90% 20%, rgba(99, 102, 241, 0.08), transparent 50%),
    linear-gradient(180deg, #0a0d14 0%, var(--color-bg) 100%);
  --gradient-card: linear-gradient(145deg, rgba(255, 255, 255, 0.04) 0%, rgba(255, 255, 255, 0) 60%);
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 40px var(--color-accent-glow);
  --header-height: 72px;
  --container: min(1120px, calc(100% - 2.5rem));
  --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open {
  overflow: hidden;
}

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

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

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.25rem;
  background: var(--color-accent);
  color: #041008;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: top var(--transition);
}

.skip-link:focus {
  top: 1rem;
}

.container {
  width: var(--container);
  margin-inline: auto;
}

.section {
  padding-block: 5rem;
}

.section__header {
  max-width: 40rem;
  margin-bottom: 3rem;
}

.section__eyebrow {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.section__title {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section__lead {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* Header
   -------------------------------------------------------------------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-height);
  border-bottom: 1px solid transparent;
  transition: background var(--transition), border-color var(--transition), backdrop-filter var(--transition);
}

.site-header--scrolled {
  background: rgba(6, 8, 13, 0.82);
  border-color: var(--color-border);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.02em;
  transition: opacity var(--transition);
}

.site-logo:hover {
  opacity: 0.85;
}

.site-logo__mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.site-nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--transition);
}

.site-nav a:hover {
  color: var(--color-text);
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.nav-toggle:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-border-strong);
}

.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  margin-inline: auto;
  background: var(--color-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 767px) {
  .site-header__inner {
    position: relative;
  }

  .site-nav {
    position: fixed;
    inset: var(--header-height) 0 0;
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    padding: 1.5rem;
    background: rgba(6, 8, 13, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--color-border);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
  }

  .site-nav--open {
    display: flex;
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-nav a {
    display: block;
    width: 100%;
    padding: 1rem 0;
    font-size: 1.125rem;
    border-bottom: 1px solid var(--color-border);
  }
}

@media (min-width: 768px) {
  .site-nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }
}

/* Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  background: var(--gradient-hero);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(255, 255, 255, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.025) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 40%, black, transparent);
  pointer-events: none;
}

.hero__content {
  position: relative;
  padding-block: 4rem 6rem;
  max-width: 42rem;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0.375rem 0.875rem 0.375rem 0.625rem;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-dim);
  border: 1px solid rgba(61, 220, 132, 0.25);
  border-radius: var(--radius-full);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-glow);
}

.hero__title {
  margin: 0 0 1.25rem;
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.05;
  background: linear-gradient(135deg, #ffffff 30%, #a8b0bd 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__subtitle {
  margin: 0 0 2.5rem;
  font-size: clamp(1.0625rem, 2.5vw, 1.25rem);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 36rem;
}

/* Buttons
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9375rem 1.75rem;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1;
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
}

.btn--primary {
  color: #041008;
  background: var(--color-accent);
  box-shadow: 0 4px 20px rgba(61, 220, 132, 0.25);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn--primary:active {
  transform: translateY(0);
}

.btn__arrow {
  transition: transform var(--transition);
}

.btn--primary:hover .btn__arrow {
  transform: translateX(3px);
}

/* Apps grid
   -------------------------------------------------------------------------- */

.apps {
  background: var(--color-bg-elevated);
}

.apps-grid {
  display: grid;
  gap: 1.5rem;
}

.app-card {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding: 1.75rem;
  background: var(--gradient-card), var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), background var(--transition);
}

.app-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
  background: var(--gradient-card), var(--color-surface-hover);
}

.app-card__icon-wrap {
  flex-shrink: 0;
}

.app-card__icon {
  width: 88px;
  height: 88px;
  border-radius: 22%;
  object-fit: cover;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  border: 1px solid var(--color-border);
  background: linear-gradient(135deg, #1a2030, #0e1219);
}

.app-card__tagline {
  margin: 0 0 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.app-card__title {
  margin: 0 0 0.75rem;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.app-card__description {
  margin: 0 0 1.5rem;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* Google Play badge
   -------------------------------------------------------------------------- */

.play-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 1.125rem 0.625rem 0.875rem;
  background: #0d0f14;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  transition: transform var(--transition), border-color var(--transition), background var(--transition), box-shadow var(--transition);
}

.play-badge:hover {
  transform: translateY(-2px);
  border-color: rgba(61, 220, 132, 0.4);
  background: #11141c;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.play-badge__icon {
  width: 22px;
  height: 22px;
  color: var(--color-text);
  flex-shrink: 0;
}

.play-badge__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.play-badge__label {
  font-size: 0.625rem;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.play-badge__store {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

@media (min-width: 640px) {
  .apps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .app-card {
    padding: 2rem;
  }

  .app-card--wide {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: flex-start;
  }
}

@media (min-width: 1024px) {
  .apps-grid {
    gap: 1.75rem;
  }
}

/* About
   -------------------------------------------------------------------------- */

.about {
  position: relative;
}

.about__grid {
  display: grid;
  gap: 2.5rem;
  align-items: start;
}

.about__text p {
  margin: 0 0 1.25rem;
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  line-height: 1.75;
}

.about__text p:last-child {
  margin-bottom: 0;
}

.about__pillars {
  display: grid;
  gap: 1rem;
}

.pillar {
  padding: 1.25rem 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), transform var(--transition);
}

.pillar:hover {
  border-color: var(--color-border-strong);
  transform: translateX(4px);
}

.pillar__title {
  margin: 0 0 0.375rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-text);
}

.pillar__text {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

@media (min-width: 768px) {
  .about__grid {
    grid-template-columns: 1.2fr 1fr;
    gap: 4rem;
  }
}

/* Contact
   -------------------------------------------------------------------------- */

.contact {
  background: var(--color-bg-elevated);
}

.contact-card {
  max-width: 36rem;
  padding: 2.5rem;
  background: var(--gradient-card), var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.contact-card:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

.contact-card__business {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.contact-card__address {
  margin: 0 0 1.25rem;
  font-size: 0.9375rem;
  font-style: normal;
  line-height: 1.65;
  color: var(--color-text-muted);
}

.contact-card__label {
  margin: 0 0 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.contact-card__email {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-accent);
  transition: opacity var(--transition), transform var(--transition);
}

.contact-card__email:hover {
  opacity: 0.85;
  transform: translateX(2px);
}

.contact-card__email svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* Footer
   -------------------------------------------------------------------------- */

.site-footer {
  padding-block: 2rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.site-footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
}

.site-footer__copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-text-subtle);
}

.site-footer__tagline {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--color-text-muted);
}

@media (min-width: 640px) {
  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* Reduced motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}