:root {
  --bg: #f7f9ff;
  --surface: #ffffff;
  --text: #1c2440;
  --muted: #5f6985;
  --primary: #4f7bff;
  --secondary: #7d5bff;
  --accent: #ff8f3f;
  --ring: rgba(79, 123, 255, 0.2);
  --shadow: 0 16px 30px rgba(31, 56, 129, 0.12);
  --radius: 20px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", sans-serif;
  background: linear-gradient(180deg, #f9fbff 0%, #f4f7ff 100%);
  color: var(--text);
  overflow-x: hidden;
}

img {
  display: block;
  max-width: 100%;
  border-radius: 16px;
}

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

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

.section {
  padding: 4.5rem 0;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.9rem, 4.3vw, 3.2rem);
  line-height: 1.15;
}

h2 {
  font-size: clamp(1.6rem, 3.2vw, 2.25rem);
  margin-bottom: 1.2rem;
}

p {
  line-height: 1.7;
  color: var(--muted);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.86);
  border-bottom: 1px solid rgba(125, 91, 255, 0.1);
}

.nav-wrap {
  min-height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.logo {
  font-weight: 800;
  letter-spacing: -0.01em;
  max-width: 220px;
}

.main-nav {
  position: fixed;
  inset: 74px 0 auto;
  background: var(--surface);
  border-bottom: 1px solid rgba(125, 91, 255, 0.14);
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.1rem;
  padding: 0.8rem;
  transform: translateY(-140%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s ease, opacity 0.22s ease;
}

.main-nav a {
  font-weight: 600;
  color: var(--text);
  padding: 0.75rem 0.85rem;
  border-radius: 10px;
}

.main-nav a:hover {
  background: #eef2ff;
}

.main-nav.is-open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.menu-toggle {
  border: 0;
  background: #edf2ff;
  border-radius: 12px;
  width: 46px;
  height: 42px;
  display: grid;
  place-content: center;
  gap: 5px;
  cursor: pointer;
}

.menu-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text);
  transition: transform 0.2s ease;
}

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

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  transform: scaleX(0);
}

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

.hero {
  padding-top: 5.5rem;
}

.hero-grid {
  display: grid;
  gap: 2.2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 0.9rem;
  font-weight: 700;
  color: var(--secondary);
  background: #efeaff;
  padding: 0.42rem 0.8rem;
  border-radius: 999px;
  font-size: 0.9rem;
}

.lead {
  margin: 1rem 0 1.8rem;
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  max-width: 62ch;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  border-radius: 12px;
  padding: 0.88rem 1.3rem;
  border: 0;
  transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
  box-shadow: 0 10px 20px rgba(80, 110, 238, 0.34);
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:focus-visible,
.menu-toggle:focus-visible,
.main-nav a:focus-visible,
.footer-nav a:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--ring);
}

.hero-card {
  background: radial-gradient(circle at 20% 10%, #eef3ff 0%, #f8f7ff 60%, #fff7ee 100%);
  border-radius: var(--radius);
  padding: 1.1rem;
  box-shadow: var(--shadow);
}

.app-mockup {
  background: var(--surface);
  border-radius: 16px;
  border: 1px solid #e9ebf7;
  padding: 1.2rem;
}

.mockup-title {
  color: var(--text);
  font-weight: 700;
  margin-bottom: 1rem;
}

.mockup-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed #e6e9f4;
}

.mockup-row span {
  color: var(--muted);
}

.mockup-result {
  margin-top: 1rem;
  border-radius: 14px;
  background: linear-gradient(135deg, #4f7bff, #7d5bff);
  color: #fff;
  padding: 0.8rem;
}

.mockup-result p {
  color: #e8eaff;
  font-size: 0.9rem;
}

.mockup-result strong {
  font-size: 1.35rem;
}

.about .container {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
}

.feature-grid,
.step-grid {
  display: grid;
  gap: 1rem;
  margin-top: 1.4rem;
}

.feature-card,
.step-card,
.developer-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid #ebedf8;
}

.feature-card {
  padding: 1.2rem;
}

.feature-card h3 {
  margin: 0.8rem 0 0.55rem;
}

.icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(130deg, #4f7bff, #7d5bff, #ff8f3f);
  color: #fff;
  font-weight: 700;
  display: grid;
  place-items: center;
  font-size: 0.85rem;
}

.step-card {
  padding: 1.2rem;
}

.step-number {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  font-weight: 700;
  margin-bottom: 0.65rem;
}

.step-card h3 {
  margin-bottom: 0.55rem;
}

.developer-panel {
  background: linear-gradient(145deg, #ffffff 0%, #f8f6ff 55%, #fff9f2 100%);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid #ebedf8;
  padding: 1.2rem;
}

.developer-head {
  margin-bottom: 1rem;
}

.developer-kicker {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--secondary);
  background: #efeaff;
  border-radius: 999px;
  padding: 0.35rem 0.7rem;
  margin-bottom: 0.75rem;
}

.developer-head h2 {
  margin-bottom: 0.5rem;
}

.developer-grid {
  display: grid;
  gap: 0.8rem;
}

.developer-item {
  background: #fff;
  border: 1px solid #e8ebf9;
  border-radius: 14px;
  padding: 0.9rem 0.95rem;
  min-height: 88px;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}

.developer-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #7b84a0;
  font-weight: 700;
}

.developer-value {
  margin-top: 0.38rem;
  color: var(--text);
  font-weight: 600;
  line-height: 1.48;
  word-break: break-word;
}

.developer-value address,
.developer-item address.developer-value {
  margin: 0.32rem 0 0;
  font-style: normal;
}

.developer-value a {
  color: var(--primary);
}

.developer-item-full {
  min-height: 0;
}

.site-footer {
  border-top: 1px solid rgba(125, 91, 255, 0.16);
  margin-top: 1.6rem;
  background: #fcfdff;
}

.footer-wrap {
  padding: 1.45rem 0 1.9rem;
  display: grid;
  gap: 0.9rem;
}

.footer-brand {
  color: var(--text);
  font-weight: 700;
}

.footer-copy {
  font-size: 0.95rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.footer-nav a {
  color: var(--secondary);
  font-weight: 600;
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (min-width: 680px) {
  .logo {
    max-width: none;
  }

  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 2rem;
  }

  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .step-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .developer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .developer-item-full {
    grid-column: 1 / -1;
  }

}

@media (min-width: 960px) {
  .section {
    padding: 5.4rem 0;
  }

  .menu-toggle {
    display: none;
  }

  .main-nav {
    position: static;
    display: flex;
    align-items: center;
    gap: 0.2rem;
    padding: 0;
    border: 0;
    box-shadow: none;
    opacity: 1;
    pointer-events: auto;
    transform: none;
    background: transparent;
  }

  .feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .about .container {
    padding: 2rem;
  }

  .developer-panel {
    padding: 1.8rem;
  }

  .developer-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .developer-item-full {
    grid-column: 1 / -1;
  }
}