:root {
  --navy: #0b1f3d;
  --blue: #1054d8;
  --cyan: #1bc7d4;
  --green: #20bf7b;
  --red: #ef4a5f;
  --ink: #111827;
  --muted: #667085;
  --line: #dce6f2;
  --soft: #f3f8fc;
  --card: #ffffff;
  --shadow: 0 24px 70px rgba(16, 40, 82, 0.16);
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", Roboto, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(27, 199, 212, 0.2), transparent 26%),
    linear-gradient(180deg, #f7fbff 0, #eef6fb 580px, #f8fafc 100%);
  letter-spacing: 0;
}

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

button {
  border: 0;
  font: inherit;
}

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

code {
  padding: 3px 7px;
  border-radius: 7px;
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
}

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

.site-header {
  position: fixed;
  top: 16px;
  left: 50%;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: min(1160px, calc(100% - 32px));
  min-height: 70px;
  padding: 10px 12px;
  border: 1px solid rgba(220, 230, 242, 0.85);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 18px 48px rgba(11, 31, 61, 0.12);
  transform: translateX(-50%);
  backdrop-filter: blur(16px);
}

.brand,
.site-nav,
.hero-actions,
.signal-row,
.security-strip,
.download-panel {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  min-width: 220px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 16px;
  color: #fff;
  background: linear-gradient(145deg, var(--navy), var(--blue) 58%, var(--cyan));
  font-size: 22px;
  font-weight: 950;
  box-shadow: 0 12px 28px rgba(16, 84, 216, 0.24);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 18px;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.site-nav {
  gap: 24px;
  color: #536174;
  font-size: 15px;
  font-weight: 850;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--blue);
}

.header-cta,
.primary-cta,
.secondary-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 16px;
  font-weight: 900;
  white-space: nowrap;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.header-cta,
.primary-cta {
  color: #fff;
  background: var(--blue);
  box-shadow: 0 14px 28px rgba(16, 84, 216, 0.24);
}

.secondary-cta {
  color: var(--navy);
  border: 1px solid var(--line);
  background: #fff;
}

.header-cta:hover,
.primary-cta:hover,
.secondary-cta:hover {
  transform: translateY(-1px);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 500px);
  gap: 56px;
  width: min(1160px, calc(100% - 36px));
  min-height: 100vh;
  margin: 0 auto;
  padding: 136px 0 58px;
  align-items: center;
}

.hero-copy {
  max-width: 650px;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--blue);
  font-size: 13px;
  font-weight: 950;
}

h1 {
  max-width: 680px;
  color: var(--navy);
  font-size: clamp(42px, 6vw, 74px);
  line-height: 1.05;
  letter-spacing: 0;
  word-break: keep-all;
}

h2 {
  color: var(--navy);
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.16;
  letter-spacing: 0;
  word-break: keep-all;
}

h3 {
  color: var(--navy);
  font-size: 20px;
  letter-spacing: 0;
}

.hero-text {
  max-width: 620px;
  margin-top: 22px;
  color: #48566a;
  font-size: 18px;
  line-height: 1.75;
  word-break: keep-all;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.signal-row {
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.signal-row span {
  min-height: 40px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.72);
  font-size: 14px;
  font-weight: 850;
}

.signal-row b {
  color: var(--blue);
}

.hero-visual {
  position: relative;
  margin: 0;
  border-radius: 8px;
}

.hero-visual::before {
  position: absolute;
  inset: 10% -5% 2% 3%;
  z-index: -1;
  border-radius: 50%;
  background: rgba(27, 199, 212, 0.24);
  filter: blur(42px);
  content: "";
}

.hero-visual img {
  width: 100%;
  border: 1px solid rgba(220, 230, 242, 0.8);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.security-strip,
.feature-section,
.app-preview,
.download-panel {
  width: min(1160px, calc(100% - 36px));
  margin: 0 auto;
}

.security-strip {
  justify-content: space-between;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 16px 42px rgba(16, 40, 82, 0.08);
}

.security-strip article {
  flex: 1;
  min-height: 86px;
  padding: 16px;
  border-radius: 8px;
  background: var(--soft);
}

.security-strip p {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 850;
}

.security-strip strong {
  display: block;
  color: var(--navy);
  font-size: 20px;
}

.status-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 8px;
  border-radius: 50%;
}

.status-dot.safe {
  background: var(--green);
}

.status-dot.warn {
  background: #ffb020;
}

.status-dot.info {
  background: var(--cyan);
}

.feature-section {
  padding: 86px 0 70px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 28px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-grid article {
  min-height: 278px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(16, 40, 82, 0.08);
}

.feature-grid p,
.preview-copy p,
.download-panel p {
  margin-top: 12px;
  color: var(--muted);
  line-height: 1.68;
  word-break: keep-all;
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin-bottom: 22px;
  border-radius: 8px;
  background: #e7f7fa;
}

.feature-icon::before {
  width: 23px;
  height: 23px;
  background: var(--blue);
  content: "";
  mask: var(--mask) center / contain no-repeat;
}

.shield {
  --mask: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M12 2 4 5v6c0 5 3.4 9.7 8 11 4.6-1.3 8-6 8-11V5l-8-3Zm-1 14-4-4 1.4-1.4 2.6 2.6 5.6-5.6L18 9l-7 7Z'/%3E%3C/svg%3E");
}

.message {
  --mask: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M4 4h16v12H7l-3 4V4Zm4 5h8V7H8v2Zm0 4h6v-2H8v2Z'/%3E%3C/svg%3E");
}

.file {
  --mask: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M6 2h9l5 5v15H6V2Zm8 2.5V8h3.5L14 4.5ZM8 12h8v2H8v-2Zm0 4h8v2H8v-2Z'/%3E%3C/svg%3E");
}

.bank {
  --mask: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3 9 12 3l9 6v2H3V9Zm2 4h3v5H5v-5Zm5.5 0h3v5h-3v-5Zm5.5 0h3v5h-3v-5ZM3 20h18v2H3v-2Z'/%3E%3C/svg%3E");
}

.app-preview {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 64px;
  align-items: center;
  padding: 22px 0 88px;
}

.phone-card {
  overflow: hidden;
  min-height: 600px;
  padding: 26px 22px;
  border: 10px solid #101828;
  border-radius: 38px;
  background: linear-gradient(180deg, #f8fbff, #ebf7fa);
  box-shadow: var(--shadow);
}

.phone-topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--navy);
  font-weight: 950;
}

.phone-topbar span {
  width: 34px;
  height: 34px;
  border-radius: 17px;
  background: #e4eef9;
}

.scan-ring {
  display: grid;
  place-items: center;
  width: 210px;
  height: 210px;
  margin: 64px auto 42px;
  border: 18px solid rgba(32, 191, 123, 0.2);
  border-top-color: var(--green);
  border-right-color: var(--cyan);
  border-radius: 50%;
  color: var(--navy);
  background: #fff;
}

.scan-ring span,
.scan-ring strong {
  display: block;
}

.scan-ring span {
  color: var(--muted);
  font-weight: 850;
}

.scan-ring strong {
  margin-top: 6px;
  font-size: 38px;
}

.mini-list {
  display: grid;
  gap: 12px;
}

.mini-list p {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 58px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--navy);
  background: #fff;
  font-weight: 900;
}

.check {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--green);
}

.check::after {
  width: 13px;
  height: 8px;
  border-bottom: 3px solid #fff;
  border-left: 3px solid #fff;
  transform: rotate(-45deg) translateY(-1px);
  content: "";
}

.preview-copy {
  max-width: 620px;
}

.download-panel {
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 56px;
  padding: 32px;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--navy), #1054d8 62%, #12a9c5);
  box-shadow: var(--shadow);
}

.download-panel > div {
  max-width: 520px;
}

.download-panel h2 {
  color: #fff;
}

.download-panel .eyebrow,
.download-panel p {
  color: rgba(255, 255, 255, 0.82);
}

.download-panel .primary-cta {
  color: var(--blue);
  background: #fff;
  box-shadow: none;
}

.steps {
  display: grid;
  grid-template-columns: repeat(2, minmax(130px, 1fr));
  gap: 10px;
  min-width: 310px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.steps li {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 56px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.14);
  font-weight: 900;
}

.steps span {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  color: var(--blue);
  background: #fff;
}

@media (max-width: 980px) {
  .site-header {
    position: absolute;
  }

  .site-nav {
    display: none;
  }

  .hero,
  .app-preview {
    grid-template-columns: 1fr;
  }

  .hero {
    gap: 42px;
    min-height: auto;
    padding-top: 118px;
  }

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

  .security-strip,
  .download-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .app-preview {
    gap: 38px;
  }

  .phone-card {
    width: min(360px, 100%);
    margin: 0 auto;
  }

  .steps {
    min-width: 0;
  }
}

@media (max-width: 640px) {
  .site-header {
    top: 10px;
    width: calc(100% - 20px);
    min-height: 62px;
    border-radius: 18px;
  }

  .brand {
    min-width: 0;
  }

  .brand small {
    display: none;
  }

  .brand-mark {
    width: 44px;
    height: 44px;
    border-radius: 14px;
  }

  .header-cta {
    min-height: 42px;
    padding-inline: 12px;
    border-radius: 14px;
    font-size: 14px;
  }

  .hero,
  .security-strip,
  .feature-section,
  .app-preview,
  .download-panel {
    width: calc(100% - 24px);
  }

  .hero {
    padding: 100px 0 44px;
  }

  h1 {
    font-size: clamp(38px, 12vw, 52px);
  }

  .hero-text {
    font-size: 16px;
  }

  .feature-grid,
  .steps {
    grid-template-columns: 1fr;
  }

  .feature-grid article {
    min-height: 0;
  }

  .phone-card {
    min-height: 540px;
    border-width: 7px;
    border-radius: 32px;
  }

  .scan-ring {
    width: 188px;
    height: 188px;
    margin-top: 48px;
  }

  .download-panel {
    padding: 24px;
  }
}