/* ============================================
   Kurs Landing Page
   ============================================ */

/* --- Reset & Base --- */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #1d1d1f;
  background: #ffffff;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Nav --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 24px;
  transition: all 0.3s ease;
}

.nav--scrolled {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding: 12px 24px;
}

.nav__inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: #1d1d1f;
  font-weight: 700;
  font-size: 18px;
}

.nav__logo img {
  border-radius: 8px;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links a {
  text-decoration: none;
  color: #86868b;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.nav__links a:hover {
  color: #1d1d1f;
}

.nav__cta {
  background: #007aff !important;
  color: #fff !important;
  padding: 8px 20px;
  border-radius: 20px;
  font-weight: 600 !important;
  transition: background 0.2s !important;
}

.nav__cta:hover {
  background: #0066d6 !important;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 600;
  border-radius: 12px;
  transition: all 0.2s ease;
  cursor: pointer;
  border: none;
  font-family: inherit;
}

.btn--primary {
  background: #007aff;
  color: #fff;
}

.btn--primary:hover {
  background: #0066d6;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0, 122, 255, 0.3);
}

.btn--ghost {
  background: transparent;
  color: #007aff;
  border: 1.5px solid rgba(0, 122, 255, 0.3);
}

.btn--ghost:hover {
  background: rgba(0, 122, 255, 0.06);
  border-color: #007aff;
}

.btn--large {
  padding: 14px 32px;
  font-size: 16px;
}

/* --- Hero --- */
.hero {
  padding: 160px 24px 100px;
  text-align: center;
  background: linear-gradient(180deg, #f5f5f7 0%, #ffffff 100%);
}

.hero__inner {
  max-width: 680px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(0, 122, 255, 0.08);
  color: #007aff;
  font-size: 13px;
  font-weight: 600;
  border-radius: 20px;
  margin-bottom: 24px;
}

.hero__title {
  font-size: 56px;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  color: #1d1d1f;
}

.hero__title-accent {
  background: linear-gradient(135deg, #007aff 0%, #5ac8fa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 19px;
  color: #86868b;
  line-height: 1.6;
  margin-bottom: 40px;
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.hero__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Section Headers --- */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header h2 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  color: #1d1d1f;
}

.section-header p {
  font-size: 17px;
  color: #86868b;
  max-width: 480px;
  margin: 0 auto;
}

/* --- Features --- */
.features {
  padding: 100px 0;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.feature-card {
  background: #f5f5f7;
  border-radius: 16px;
  padding: 32px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.feature-card__icon {
  width: 48px;
  height: 48px;
  background: #fff;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #1d1d1f;
}

.feature-card p {
  font-size: 15px;
  color: #86868b;
  line-height: 1.6;
}

/* --- Steps --- */
.steps {
  padding: 100px 0;
  background: #f5f5f7;
}

.steps__grid {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
}

.step {
  text-align: center;
  flex: 1;
  max-width: 260px;
}

.step__number {
  width: 48px;
  height: 48px;
  background: #007aff;
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 700;
  margin: 0 auto 20px;
}

.step h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 8px;
  color: #1d1d1f;
}

.step p {
  font-size: 15px;
  color: #86868b;
  line-height: 1.5;
}

.step__arrow {
  display: flex;
  align-items: center;
  padding-top: 12px;
}

/* --- Download --- */
.download {
  padding: 100px 0;
}

.download__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.download-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 32px 24px;
  background: #f5f5f7;
  border-radius: 16px;
  text-decoration: none;
  color: #1d1d1f;
  transition: all 0.2s ease;
  border: 2px solid transparent;
}

.download-card:hover {
  border-color: #007aff;
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 122, 255, 0.12);
}

.download-card__icon {
  margin-bottom: 16px;
}

.download-card__info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 8px;
}

.download-card__label {
  font-size: 13px;
  color: #86868b;
  font-weight: 500;
}

.download-card__platform {
  font-size: 20px;
  font-weight: 700;
}

.download-card__meta {
  font-size: 12px;
  color: #aeaeb2;
  font-weight: 500;
}

/* --- Download Guide Link --- */
.download__guide {
  text-align: center;
  margin-top: 32px;
}

.download__guide p {
  font-size: 15px;
  color: #86868b;
}

.download__guide a {
  color: #007aff;
  text-decoration: none;
  font-weight: 500;
}

.download__guide a:hover {
  text-decoration: underline;
}

/* --- Footer --- */
.footer {
  padding: 32px 0;
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  color: #1d1d1f;
}

.footer__brand img {
  border-radius: 6px;
}

.footer__copy {
  font-size: 13px;
  color: #aeaeb2;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .hero {
    padding: 120px 20px 80px;
  }

  .hero__title {
    font-size: 36px;
  }

  .hero__subtitle {
    font-size: 16px;
  }

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

  .steps__grid {
    flex-direction: column;
    align-items: center;
  }

  .step__arrow {
    transform: rotate(90deg);
    padding: 0;
  }

  .download__grid {
    grid-template-columns: 1fr;
    max-width: 320px;
  }

  .nav__links a:not(.nav__cta) {
    display: none;
  }

  .section-header h2 {
    font-size: 28px;
  }

  .footer__inner {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero__title {
    font-size: 30px;
  }

  .hero__actions {
    flex-direction: column;
    align-items: center;
  }

  .btn--large {
    width: 100%;
    justify-content: center;
  }
}