@font-face {
  font-family: "Pretendard";
  src: url("./Pretendard-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("./Pretendard-SemiBold.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Pretendard";
  src: url("./Pretendard-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --bg: #f8f9fb;
  --bg-soft: #f3f5f9;
  --surface: #ffffff;
  --surface-soft: #f7f8fc;
  --text: #111111;
  --muted: #4b5563;
  --accent: #0f172a;
  --line: #e5e7eb;
  --radius: 16px;
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.07);
  --shadow-hover: 0 16px 40px rgba(15, 23, 42, 0.12);
  --easing: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: "Pretendard", "Inter", "Noto Sans KR", "Apple SD Gothic Neo", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.62;
  letter-spacing: -0.01em;
  text-rendering: optimizeLegibility;
  position: relative;
  overflow-x: clip;
}

body::before,
body::after {
  content: "";
  position: fixed;
  z-index: -1;
  width: 420px;
  height: 420px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(30, 41, 59, 0.09) 0%, rgba(30, 41, 59, 0) 70%);
  filter: blur(8px);
  pointer-events: none;
  transition: transform 500ms var(--easing);
}

body::before {
  top: -120px;
  left: -120px;
}

body::after {
  right: -120px;
  bottom: -120px;
}

body.is-scrolling::before {
  transform: translate3d(0, 12px, 0);
}

body.is-scrolling::after {
  transform: translate3d(0, -12px, 0);
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.14em;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid transparent;
  transition: background-color 250ms ease, border-color 250ms ease, backdrop-filter 250ms ease;
}

.site-header.is-scrolled {
  background: rgba(248, 249, 251, 0.75);
  backdrop-filter: blur(12px);
  border-bottom-color: rgba(229, 231, 235, 0.9);
}

.header-inner {
  height: 60px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-link {
  display: inline-flex;
  align-items: center;
  color: var(--text);
  text-decoration: none;
}

.logo-image {
  display: block;
  height: 21px;
  width: auto;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

.lang-switch a {
  color: var(--muted);
  text-decoration: none;
  transition: color 180ms ease;
}

.lang-switch a:hover {
  color: var(--text);
}

.lang-switch a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

.main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 28px 80px;
}

.hero {
  min-height: min(86vh, 840px);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 80px 0 64px;
}

.hero-inner {
  max-width: 860px;
}

.hero-title {
  margin: 0;
  font-size: clamp(2.1rem, 6.2vw, 4.5rem);
  line-height: 1.18;
  letter-spacing: -0.04em;
  font-weight: 700;
}

.hero-title .strong {
  color: var(--accent);
}

.hero-subtitle {
  margin: 20px auto 0;
  max-width: 620px;
  font-size: clamp(1.02rem, 2.4vw, 1.34rem);
  color: var(--muted);
}

.hero-actions {
  margin-top: 34px;
  display: inline-flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #ffffff;
  border-radius: 14px;
  text-decoration: none;
  font-weight: 600;
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.16);
  transition: transform 220ms ease, box-shadow 220ms ease, filter 220ms ease;
}

.btn-primary:hover {
  transform: scale(1.03);
  box-shadow: 0 14px 28px rgba(15, 23, 42, 0.22);
  text-decoration: none;
}

.link-secondary {
  color: var(--muted);
  text-decoration: none;
  position: relative;
  font-weight: 500;
}

.link-secondary::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms ease;
}

.link-secondary:hover {
  color: var(--text);
}

.link-secondary:hover::after {
  transform: scaleX(1);
}

.section {
  padding: 72px 0;
}

.section-alt {
  background: var(--bg-soft);
  margin: 0 -28px;
  padding: 72px 28px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-inner {
  max-width: 980px;
}

.section-title {
  margin: 0 0 18px;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.28;
  font-weight: 600;
  letter-spacing: -0.025em;
}

.text-block {
  margin: 0;
  max-width: 74ch;
  font-size: 1.06rem;
  color: var(--muted);
}

.text-block + .text-block {
  margin-top: 14px;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.principle-card {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 16px;
  padding: 18px;
  font-size: 1rem;
  color: #273244;
  box-shadow: var(--shadow-soft);
  transition: transform 220ms ease, box-shadow 220ms ease;
}

.principle-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

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

.panel {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 16px;
  padding: 22px;
  box-shadow: var(--shadow-soft);
}

.panel-title {
  margin: 0 0 12px;
  font-size: 1.2rem;
  line-height: 1.35;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.list {
  margin: 0;
  padding-left: 1.15rem;
  color: #273244;
}

.list li + li {
  margin-top: 10px;
}

.connect-cta {
  margin-top: 24px;
}

.contact-link {
  display: inline-block;
  margin-top: 10px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.footer {
  margin-top: 56px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
  text-align: right;
}

.reveal,
.stagger-item,
.hero-seq {
  opacity: 0;
  transform: translateY(12px);
}

.is-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 700ms var(--easing), transform 700ms var(--easing);
}

.hero-seq.is-visible {
  transition-duration: 760ms;
}

@media (max-width: 920px) {
  .header-inner,
  .main {
    padding-left: 22px;
    padding-right: 22px;
  }

  .section-alt {
    margin-left: -22px;
    margin-right: -22px;
    padding-left: 22px;
    padding-right: 22px;
  }

  .hero {
    min-height: 76vh;
    padding-top: 64px;
    padding-bottom: 52px;
  }

  .section {
    padding: 58px 0;
  }

  .section-alt {
    padding-top: 58px;
    padding-bottom: 58px;
  }

  .card-grid,
  .split-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .header-inner,
  .main {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section-alt {
    margin-left: -16px;
    margin-right: -16px;
    padding-left: 16px;
    padding-right: 16px;
  }

  .hero-title {
    line-height: 1.24;
  }

  .logo-image {
    height: 18px;
  }

  .btn-primary {
    width: 100%;
  }

  .hero-actions {
    width: 100%;
    gap: 14px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition-duration: 1ms !important;
    transition-delay: 0ms !important;
    scroll-behavior: auto !important;
  }

  .reveal,
  .stagger-item,
  .hero-seq {
    opacity: 1;
    transform: none;
  }
}