* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Pretendard", sans-serif;
  color: #111827;
  background: #f8fafc;
  line-height: 1.6;
}

img {
  display: block;
  width: 100%;
}

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

.container {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

/* HEADER */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(14px);
  background: rgba(248, 250, 252, 0.8);
  border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.header-inner {
  height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  width: 160px;
  height: auto;
  display: block;
}

.nav {
  display: flex;
  gap: 28px;
}

.nav a {
  font-size: 0.95rem;
  color: #475569;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: #0f172a;
}

/* HERO */
.hero {
  padding: 90px 0 80px;
  overflow: hidden;
  background: radial-gradient(
      circle at top left,
      rgba(99, 102, 241, 0.18),
      transparent 30%
    ),
    radial-gradient(
      circle at bottom right,
      rgba(14, 165, 233, 0.18),
      transparent 25%
    ),
    #f8fafc;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 48px;
}

.badge,
.section-label {
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(99, 102, 241, 0.12);
  color: #4338ca;
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero-text h1 {
  font-size: clamp(2.4rem, 5vw, 4.5rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  margin-bottom: 20px;
  color: #0f172a;
}

.hero-text p {
  font-size: 1.08rem;
  color: #475569;
  margin-bottom: 28px;
}

.hero-buttons {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 150px;
  padding: 14px 22px;
  border-radius: 14px;
  font-weight: 700;
  transition: 0.25s ease;
}

.btn-primary {
  background: linear-gradient(135deg, #4f46e5, #2563eb);
  color: #fff;
  box-shadow: 0 12px 30px rgba(37, 99, 235, 0.22);
}

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

.btn-secondary {
  background: #ffffff;
  color: #0f172a;
  border: 1px solid #e2e8f0;
}

.btn-secondary:hover {
  background: #f1f5f9;
}

.hero-stats {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.stat-card {
  min-width: 160px;
  padding: 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.15);
  box-shadow: 0 12px 40px rgba(15, 23, 42, 0.06);
}

.stat-card strong {
  display: block;
  font-size: 1rem;
  margin-bottom: 6px;
  color: #0f172a;
}

.stat-card span {
  font-size: 0.92rem;
  color: #64748b;
}

.hero-visual {
  position: relative;
  min-height: 650px;
}

.phone {
  position: absolute;
  width: 260px;
  border-radius: 34px;
  overflow: hidden;
  background: #0f172a;
  padding: 10px;
  box-shadow: 0 30px 60px rgba(15, 23, 42, 0.18);
}

.phone img {
  border-radius: 26px;
  aspect-ratio: 9 / 19;
  object-fit: cover;
}

.phone-main {
  top: 40px;
  left: 50%;
  transform: translateX(-50%);
  width: 290px;
  z-index: 3;
}

.phone-sub.top {
  top: 0;
  left: 20px;
  width: 220px;
  z-index: 2;
}

.phone-sub.bottom {
  bottom: 10px;
  right: 20px;
  width: 220px;
  z-index: 1;
}

/* SECTION */
.section {
  padding: 110px 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 50px;
}

.section-head.center {
  text-align: center;
  margin: 0 auto 50px;
}

.section-head h2 {
  font-size: clamp(1.9rem, 3.3vw, 3rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: 14px;
  color: #0f172a;
}

.section-head p {
  color: #64748b;
  font-size: 1.04rem;
}

/* ABOUT */
.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.about-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 24px;
  padding: 28px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
}

.about-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
  color: #0f172a;
}

.about-card p {
  color: #64748b;
}

/* FEATURES */
.section-dark {
  background: #0f172a;
}

.section-head.light h2,
.section-head.light p,
.section-head.light .section-label {
  color: #fff;
}

.section-head.light .section-label {
  background: rgba(255, 255, 255, 0.12);
}

.feature-list {
  display: grid;
  gap: 20px;
}

.feature-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 28px;
}

.feature-number {
  min-width: 64px;
  height: 64px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #4f46e5, #0ea5e9);
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
}

.feature-content h3 {
  color: #fff;
  font-size: 1.2rem;
  margin-bottom: 8px;
}

.feature-content p {
  color: rgba(255, 255, 255, 0.72);
}

/* SCREENS */
.screens-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.screen-card {
  background: #fff;
  border-radius: 28px;
  padding: 14px 14px 20px;
  border: 1px solid #e5e7eb;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.06);
}

.screen-card img {
  border-radius: 20px;
  aspect-ratio: 9 / 19;
  object-fit: cover;
}

.screen-text {
  margin-top: 20px;
  font-size: 1rem;
  line-height: 1.5;
  color: #334155;
  text-align: center;
  font-weight: 800;
  letter-spacing: -0.01em;
}

/* CTA */
.cta-section {
  padding-top: 0;
}

.cta-box {
  background: linear-gradient(135deg, #111827, #1e293b);
  color: #fff;
  border-radius: 32px;
  padding: 40px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: center;
  box-shadow: 0 22px 50px rgba(15, 23, 42, 0.18);
}

.cta-box h2 {
  font-size: clamp(1.8rem, 3vw, 2.7rem);
  line-height: 1.2;
  margin-bottom: 12px;
}

.cta-box p {
  color: rgba(255, 255, 255, 0.75);
}

.cta-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* FOOTER */
.footer {
  padding: 40px 0 70px;
  background: #f8fafc;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  border-top: 1px solid #e5e7eb;
  padding-top: 32px;
}

.footer-logo {
  margin-bottom: 10px;
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #0f172a;
}

.footer-text,
.footer-info p {
  color: #64748b;
  font-size: 0.95rem;
}

/* SCROLL REVEAL */
.reveal {
  opacity: 0;
  transform: translateY(50px) scale(0.98);
  transition: opacity 0.8s ease, transform 0.8s ease;
  will-change: opacity, transform;
}

.reveal.active {
  opacity: 1;
  transform: translateY(0) scale(1);
}

/* RESPONSIVE */
@media (max-width: 1100px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    min-height: 560px;
    margin-top: 20px;
  }

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

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

  .cta-box {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .container {
    width: min(100% - 32px, 1200px);
  }

  .nav {
    display: none;
  }

  .header-inner {
    height: 68px;
  }

  .logo img {
    width: 130px;
  }

  .hero {
    padding: 70px 0 60px;
  }

  .section {
    padding: 80px 0;
  }

  .hero-text h1 {
    font-size: 2.4rem;
  }

  .hero-text p,
  .section-head p,
  .about-card p,
  .feature-content p,
  .cta-box p {
    font-size: 0.97rem;
  }

  .hero-visual {
    min-height: 500px;
  }

  .phone-main {
    width: 220px;
  }

  .phone-sub.top,
  .phone-sub.bottom {
    width: 165px;
  }

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

  .feature-item {
    flex-direction: column;
  }

  .footer-inner {
    flex-direction: column;
  }

  @media (max-width: 768px) {
    .container {
      width: calc(100% - 32px);
    }

    .nav {
      display: none;
    }

    .header-inner {
      height: 68px;
    }

    .logo img {
      width: 120px;
    }

    .hero {
      padding: 56px 0 50px;
    }

    .hero-inner {
      grid-template-columns: 1fr;
      gap: 28px;
    }

    .hero-text {
      text-align: center;
    }

    .hero-text h1 {
      font-size: 2.2rem;
      line-height: 1.18;
      margin-bottom: 16px;
    }

    .hero-text p {
      font-size: 1rem;
      margin-bottom: 24px;
    }

    .hero-buttons {
      justify-content: center;
    }

    .hero-stats {
      justify-content: center;
    }

    .stat-card {
      width: 100%;
      min-width: unset;
    }

    .hero-visual {
      min-height: 420px;
      margin-top: 8px;
    }

    .phone {
      padding: 8px;
      border-radius: 26px;
    }

    .phone img {
      border-radius: 18px;
    }

    .phone-main {
      width: 180px;
      top: 40px;
    }

    .phone-sub.top {
      width: 130px;
      left: 0;
      top: 20px;
    }

    .phone-sub.bottom {
      width: 130px;
      right: 0;
      bottom: 20px;
    }

    .section {
      padding: 72px 0;
    }

    .section-head {
      margin-bottom: 36px;
    }

    .section-head.center {
      margin: 0 auto 36px;
    }

    .section-head h2 {
      font-size: 2rem;
      line-height: 1.25;
    }

    .section-head p,
    .about-card p,
    .feature-content p,
    .cta-box p,
    .screen-text,
    .footer-text,
    .footer-info p {
      font-size: 0.96rem;
    }

    .about-grid {
      grid-template-columns: 1fr;
      gap: 16px;
    }

    .about-card {
      padding: 22px;
      border-radius: 20px;
    }

    .feature-list {
      gap: 16px;
    }

    .feature-item {
      flex-direction: column;
      gap: 18px;
      padding: 22px;
      border-radius: 20px;
    }

    .feature-number {
      min-width: 56px;
      width: 56px;
      height: 56px;
      font-size: 1rem;
    }

    .screens-grid {
      grid-template-columns: 1fr;
      gap: 18px;
    }

    .screen-card {
      padding: 12px 12px 18px;
      border-radius: 22px;
    }

    .cta-section {
      padding-top: 0;
    }

    .cta-box {
      flex-direction: column;
      align-items: flex-start;
      padding: 28px 22px;
      border-radius: 24px;
    }

    .cta-buttons {
      width: 100%;
      flex-direction: column;
    }

    .cta-buttons .btn {
      width: 100%;
    }

    .footer-inner {
      flex-direction: column;
      gap: 18px;
    }

    .footer {
      padding: 32px 0 56px;
    }
  }
  @media (max-width: 768px) {
    .container {
      width: calc(100% - 32px);
    }

    .nav {
      display: none;
    }

    .header-inner {
      height: 68px;
    }

    .logo img {
      width: 120px;
    }

    .hero {
      padding: 56px 0 50px;
    }

    .hero-inner {
      grid-template-columns: 1fr;
      gap: 28px;
    }

    .hero-text {
      text-align: center;
    }

    .hero-text h1 {
      font-size: 2.2rem;
      line-height: 1.18;
      margin-bottom: 16px;
    }

    .hero-text p {
      font-size: 1rem;
      margin-bottom: 24px;
    }

    .hero-buttons {
      justify-content: center;
    }

    .hero-stats {
      justify-content: center;
    }

    .stat-card {
      width: 100%;
      min-width: unset;
    }

    .hero-visual {
      min-height: 420px;
      margin-top: 8px;
    }

    .phone {
      padding: 8px;
      border-radius: 26px;
    }

    .phone img {
      border-radius: 18px;
    }

    .phone-main {
      width: 180px;
      top: 40px;
    }

    .phone-sub.top {
      width: 130px;
      left: 0;
      top: 20px;
    }

    .phone-sub.bottom {
      width: 130px;
      right: 0;
      bottom: 20px;
    }

    .section {
      padding: 72px 0;
    }

    .section-head {
      margin-bottom: 36px;
    }

    .section-head.center {
      margin: 0 auto 36px;
    }

    .section-head h2 {
      font-size: 2rem;
      line-height: 1.25;
    }

    .section-head p,
    .about-card p,
    .feature-content p,
    .cta-box p,
    .screen-text,
    .footer-text,
    .footer-info p {
      font-size: 0.96rem;
    }

    .about-grid {
      grid-template-columns: 1fr;
      gap: 16px;
    }

    .about-card {
      padding: 22px;
      border-radius: 20px;
    }

    .feature-list {
      gap: 16px;
    }

    .feature-item {
      flex-direction: column;
      gap: 18px;
      padding: 22px;
      border-radius: 20px;
    }

    .feature-number {
      min-width: 56px;
      width: 56px;
      height: 56px;
      font-size: 1rem;
    }

    .screens-grid {
      grid-template-columns: 1fr;
      gap: 18px;
      justify-items: center;
    }

    .screen-card {
      width: 100%;
      max-width: 260px;
      padding: 10px 10px 16px;
      border-radius: 20px;
    }

    .screen-card img {
      border-radius: 16px;
    }

    .screen-text {
      margin-top: 12px;
      font-size: 0.9rem;
    }
    ㄴ .cta-section {
      padding-top: 0;
    }

    .cta-box {
      flex-direction: column;
      align-items: flex-start;
      padding: 28px 22px;
      border-radius: 24px;
    }

    .cta-buttons {
      width: 100%;
      flex-direction: column;
    }

    .cta-buttons .btn {
      width: 100%;
    }

    .footer-inner {
      flex-direction: column;
      gap: 18px;
    }

    .footer {
      padding: 32px 0 56px;
    }
  }
}