/* ========== RESET & BASE ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-primary: #1a1a2e;
  --color-accent: #4361ee;
  --color-accent-hover: #3a56d4;
  --color-text: #2d2d3a;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-lg: 0 10px 25px rgba(0,0,0,.08);
}

html { scroll-behavior: smooth; }

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.section__title {
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 8px;
  color: var(--color-primary);
}

.section__subtitle {
  text-align: center;
  color: var(--color-text-light);
  max-width: 600px;
  margin: 0 auto 48px;
  font-size: 1.05rem;
}

/* ========== BUTTON ========== */
.btn {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  padding: 14px 32px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: background .2s, transform .15s;
}
.btn:hover { background: var(--color-accent-hover); transform: translateY(-1px); }
.btn--small { padding: 10px 20px; font-size: .9rem; }

/* ========== NAV ========== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: background .3s, box-shadow .3s;
}
.nav--scrolled {
  background: rgba(255,255,255,.95);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
}
.nav__links {
  display: flex;
  list-style: none;
  gap: 32px;
}
.nav__links a {
  text-decoration: none;
  color: var(--color-text);
  font-size: .95rem;
  font-weight: 500;
  transition: color .2s;
}
.nav__links a:hover { color: var(--color-accent); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  transition: transform .3s, opacity .3s;
}
.nav__toggle--open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle--open span:nth-child(2) { opacity: 0; }
.nav__toggle--open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== HERO ========== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: linear-gradient(160deg, #f0f4ff 0%, #fafafa 50%, #f5f0ff 100%);
}
.hero__inner { text-align: center; padding: 120px 0 80px; }
.hero__title {
  font-size: 3.2rem;
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-primary);
  margin-bottom: 24px;
}
.hero__subtitle {
  font-size: 1.2rem;
  color: var(--color-text-light);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* ========== PROBLEM / SOLUTION ========== */
.problem { padding: 96px 0; }
.problem__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
.problem__card {
  padding: 40px;
  border-radius: var(--radius);
  background: var(--color-surface);
  box-shadow: var(--shadow);
}
.problem__card h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
  color: var(--color-primary);
}
.problem__card p { color: var(--color-text-light); }
.problem__label {
  display: inline-block;
  font-size: .8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 12px;
}
.problem__card--problem .problem__label { color: #ef4444; }
.problem__card--solution .problem__label { color: #22c55e; }
.problem__card--solution { border: 2px solid var(--color-accent); }

/* ========== SERVICES ========== */
.services {
  padding: 96px 0;
  background: var(--color-surface);
}
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.services__card {
  padding: 36px 28px;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  transition: box-shadow .25s, transform .25s;
}
.services__card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}
.services__icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: #eef2ff;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}
.services__card h3 {
  font-size: 1.15rem;
  margin-bottom: 10px;
  color: var(--color-primary);
}
.services__card p { color: var(--color-text-light); font-size: .95rem; }

/* ========== PROCESS ========== */
.process { padding: 96px 0; }
.process__steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  position: relative;
}
.process__step {
  text-align: center;
  padding: 24px;
}
.process__number {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.process__step h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--color-primary);
}
.process__step p { color: var(--color-text-light); font-size: .95rem; }

/* ========== USE CASES ========== */
.usecases {
  padding: 96px 0;
  background: var(--color-surface);
}
.usecases__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.usecases__card {
  padding: 36px 28px;
  border-radius: var(--radius);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  transition: box-shadow .25s;
}
.usecases__card:hover { box-shadow: var(--shadow-lg); }
.usecases__icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  background: #eef2ff;
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 18px;
}
.usecases__card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
  color: var(--color-primary);
}
.usecases__card p { color: var(--color-text-light); font-size: .95rem; }

/* ========== ABOUT ========== */
.about { padding: 96px 0; }
.about__content { max-width: 800px; margin: 0 auto; }
.about__intro {
  font-size: 1.15rem;
  text-align: center;
  color: var(--color-text-light);
  margin-bottom: 48px;
  line-height: 1.7;
}
.about__values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.about__value h4 {
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.about__value p { color: var(--color-text-light); font-size: .9rem; }

/* ========== CONTACT ========== */
.contact {
  padding: 96px 0;
  background: linear-gradient(160deg, #f0f4ff 0%, #f5f0ff 100%);
}
.contact__form {
  max-width: 600px;
  margin: 0 auto;
  background: var(--color-surface);
  padding: 40px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
}
.contact__fields {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 24px;
}
.contact__field--full { grid-column: 1 / -1; }
.contact__field label {
  display: block;
  font-size: .85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-primary);
}
.contact__field input,
.contact__field textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-family: var(--font);
  font-size: .95rem;
  transition: border-color .2s;
  background: var(--color-bg);
}
.contact__field input:focus,
.contact__field textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}
.contact__form .btn { width: 100%; text-align: center; }

/* ========== FOOTER ========== */
.footer {
  padding: 32px 0;
  border-top: 1px solid var(--color-border);
}
.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.footer__brand {
  font-weight: 600;
  color: var(--color-primary);
}
.footer__email {
  color: var(--color-text-light);
  font-size: .9rem;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .hero__title { font-size: 2.2rem; }
  .hero__subtitle { font-size: 1.05rem; }

  .problem__grid,
  .services__grid,
  .process__steps,
  .usecases__grid,
  .about__values {
    grid-template-columns: 1fr;
  }

  .contact__fields { grid-template-columns: 1fr; }

  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255,255,255,.98);
    backdrop-filter: blur(8px);
    padding: 24px;
    gap: 16px;
    box-shadow: var(--shadow-lg);
  }
  .nav__links--open { display: flex; }
  .nav .btn--small { display: none; }
  .nav__toggle { display: flex; }

  .footer__inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
}