:root {
  --ink: #101820;
  --surface: #ffffff;
  --max-width: 1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", sans-serif;
  line-height: 1.5;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
a { color: inherit; }
p, h1, h2 { margin: 0; }

.skip-link {
  position: fixed;
  z-index: 999;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  border-radius: 8px;
  background: #fff;
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  display: flex;
  width: min(100%, var(--max-width));
  height: 76px;
  align-items: center;
  margin: 0 auto;
  padding: 0 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand img { width: 188px; height: auto; }

.button {
  display: inline-flex;
  min-height: 58px;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 0;
  border-radius: 16px;
  color: #fff;
  background: #1488ff;
  font-size: 16px;
  font-weight: 700;
  text-align: center;
  text-decoration: none;
  box-shadow: 0 8px 18px rgba(20, 136, 255, 0.18);
  transition: transform 160ms ease, background-color 160ms ease;
}

.button:hover { background: #0879ec; transform: translateY(-2px); }
.button:focus-visible { outline: 3px solid #39c7f4; outline-offset: 3px; }

.hero {
  --hero-navy: #16365f;
  --hero-blue: #1488ff;
  --hero-yellow: #ffd91a;
  --hero-ink: #101820;
  --hero-muted: #667085;
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.72fr);
  min-height: 590px;
  align-items: center;
  gap: clamp(44px, 7vw, 96px);
  width: min(calc(100% - 48px), var(--max-width));
  margin: 0 auto 42px;
  padding: 56px clamp(48px, 7vw, 82px);
  overflow: hidden;
  border-radius: 36px;
  color: var(--hero-ink);
  background: #f6f9fc;
}

.eyebrow {
  margin-bottom: 14px;
  color: var(--hero-blue);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: -0.015em;
}

.hero h1 {
  color: var(--hero-navy);
  font-size: clamp(39px, 4.35vw, 59px);
  line-height: 1.17;
  letter-spacing: -0.05em;
}

.hero h1 strong { color: var(--hero-navy); font-weight: 900; }

.hero h1 strong span {
  position: absolute;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
}

.hero h1 strong::before {
  content: "10,000원";
  display: inline-block;
  margin-right: 0.08em;
  color: var(--hero-ink);
  font-size: 1.13em;
  line-height: 1;
  background: linear-gradient(transparent 72%, var(--hero-yellow) 72%);
}

.hero-description {
  margin-top: 22px;
  color: var(--hero-muted);
  font-size: 16px;
  font-weight: 500;
  white-space: nowrap;
}

.hero .button { width: min(100%, 350px); margin-top: 24px; }

.cta-note {
  width: min(100%, 350px);
  margin-top: 8px;
  color: #596579;
  font-size: 12.5px;
  font-weight: 400;
  line-height: 1.5;
  text-align: center;
}

.hero-visual {
  display: flex;
  min-height: 554px;
  align-self: stretch;
  align-items: center;
  justify-content: center;
}

.hero-device {
  position: relative;
  width: min(100%, 302px);
  height: 500px;
  padding: 12px 7px 10px;
  overflow: hidden;
  border: 2px solid #cfd9e6;
  border-radius: 36px;
  background: #fff;
  box-shadow: 0 14px 30px rgba(22, 54, 95, 0.12);
}

.hero-device img { width: 100%; height: auto; border-radius: 27px; object-position: top center; }

.hero-speaker,
.usage-speaker {
  position: absolute;
  z-index: 1;
  top: 6px;
  left: 50%;
  width: 48px;
  height: 4px;
  border-radius: 999px;
  background: rgba(16, 24, 32, 0.32);
  transform: translateX(-50%);
}

.section-inner { width: min(100%, var(--max-width)); margin: 0 auto; }

.usage {
  padding: 63px 24px 54px;
  color: #101820;
  background: #fff;
}

.usage-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.7fr);
  align-items: center;
  gap: clamp(56px, 9vw, 112px);
}

.usage-kicker {
  margin-bottom: 14px;
  color: #1488ff;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.usage h2 {
  color: #16365f;
  font-size: clamp(32px, 3.75vw, 47px);
  line-height: 1.18;
  letter-spacing: -0.045em;
}

.usage-description {
  max-width: 520px;
  margin-top: 18px;
  color: #667085;
  font-size: 17px;
  font-weight: 400;
  line-height: 1.65;
}

.usage-demo {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.usage-device {
  position: relative;
  width: min(100%, 300px);
  height: 500px;
  padding: 12px 7px 0;
  overflow: hidden;
  border: 2px solid #d5deea;
  border-radius: 36px 36px 22px 22px;
  background: #fff;
  box-shadow: 0 12px 26px rgba(22, 54, 95, 0.1);
}

.usage-device img { width: 100%; height: auto; border-radius: 27px 27px 16px 16px; }

.usage-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  color: #667085;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.02em;
  list-style: none;
  white-space: nowrap;
}

.usage-flow li:not(:last-child)::after {
  content: "→";
  margin-left: 8px;
  color: #98a2b3;
  font-weight: 500;
}

.conversion {
  padding: 84px 24px 120px;
  color: #fff;
  background: #16365f;
  text-align: center;
}

.conversion-inner { width: min(100%, 720px); margin: 0 auto; }

.conversion-kicker {
  margin-bottom: 12px;
  color: #93ddf7;
  font-size: 14px;
  font-weight: 700;
}

.conversion h2 {
  font-size: clamp(38px, 4.8vw, 56px);
  line-height: 1.16;
  letter-spacing: -0.045em;
}

.conversion h2 strong { color: #ffd91a; }

.conversion-description {
  margin-top: 20px;
  color: #d4deeb;
  font-size: 17px;
  line-height: 1.6;
}

.conversion-button { width: min(100%, 380px); margin-top: 32px; }

.conversion small {
  display: block;
  margin-top: 12px;
  color: #aebed0;
  font-size: 11.5px;
  font-weight: 400;
}

@media (max-width: 820px) {
  .site-header { height: 64px; padding: 0 20px; }
  .brand img { width: 164px; }

  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
    gap: 24px;
    width: calc(100% - 24px);
    margin-bottom: 18px;
    padding: 31px 16px 0;
    border-radius: 26px;
  }

  .hero h1 { font-size: clamp(27px, 7.5vw, 35px); line-height: 1.18; }
  .hero h1 strong { display: inline-block; font-size: 0.92em; white-space: nowrap; }
  .hero-description { margin-top: 17px; font-size: 15px; letter-spacing: -0.025em; }
  .hero .button { width: 100%; margin-top: 18px; }
  .cta-note { margin-right: auto; margin-left: auto; }
  .hero-visual { min-height: 0; align-items: flex-start; }
  .hero-device { width: min(82%, 286px); height: 385px; border-radius: 33px 33px 0 0; box-shadow: 0 10px 24px rgba(22, 54, 95, 0.1); }
  .hero-device img { border-radius: 25px 25px 0 0; }

  .usage { padding: 56px 20px 44px; }
  .usage-grid { grid-template-columns: 1fr; gap: 36px; }
  .usage h2 { font-size: clamp(28px, 7.8vw, 33px); line-height: 1.2; }
  .usage-description { max-width: 330px; font-size: 16px; line-height: 1.6; }
  .usage-device { width: min(82%, 286px); height: 480px; border-radius: 34px 34px 20px 20px; }
  .usage-flow { gap: 5px; margin-top: 22px; font-size: 12.5px; letter-spacing: -0.035em; }
  .usage-flow li:not(:last-child)::after { margin-left: 5px; }

  .conversion { padding: 64px 20px 92px; }
  .conversion h2 { font-size: clamp(34px, 9.2vw, 42px); line-height: 1.18; }
  .conversion-offer { display: inline-block; font-size: 0.82em; white-space: nowrap; }
  .conversion-description { max-width: 330px; margin: 18px auto 0; font-size: 16px; }
  .conversion-button { width: 100%; margin-top: 28px; }
}

@media (max-width: 370px) {
  .hero h1 { font-size: 27px; }
  .hero-description { font-size: 14px; letter-spacing: -0.04em; }
  .usage { padding-right: 16px; padding-left: 16px; }
  .usage-flow { flex-wrap: wrap; gap: 4px 3px; font-size: 12px; white-space: normal; }
  .usage-flow li:not(:last-child)::after { margin-left: 3px; }
  .button { padding-right: 18px; padding-left: 18px; font-size: 15px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}