/* ── Custom Properties ─────────────────────────────────── */

:root {
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F8FA;
  --color-text: #1A1A2E;
  --color-text-secondary: #555770;
  --color-accent: #0F7B6C;
  --color-accent-light: #E8F5F2;
  --color-border: #E2E4E9;
  --font-body: 'Inter', -apple-system, sans-serif;
  --max-width: 1140px;
  --section-padding: 96px 24px;
}

/* ── CSS Reset ────────────────────────────────────────── */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: inherit;
}

ul, ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ── Utility Classes ──────────────────────────────────── */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: var(--section-padding);
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section__title {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 16px;
  color: var(--color-text);
}

.section__subtitle {
  color: var(--color-text-secondary);
  margin-bottom: 48px;
  font-size: 18px;
  line-height: 1.6;
}

/* ── Navigation ───────────────────────────────────────── */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: box-shadow 0.2s ease;
}

.nav--scrolled {
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.08);
}

.nav__container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 24px;
  height: 64px;
}

.nav__logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 3px;
  color: var(--color-accent);
  text-decoration: none;
  text-transform: uppercase;
}

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

.nav__menu a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav__menu a:hover {
  color: var(--color-accent);
}

.nav__cta {
  background-color: var(--color-accent);
  color: #FFFFFF !important;
  padding: 8px 20px;
  border-radius: 6px;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.nav__cta:hover {
  background-color: #0b6359;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 0;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* ── Hero ─────────────────────────────────────────────── */

.hero {
  background-color: var(--color-bg-alt);
  padding: 160px 0 120px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 70%;
  height: 100%;
  background:
    radial-gradient(circle at 65% 25%, rgba(15, 123, 108, 0.12) 0%, transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(15, 123, 108, 0.08) 0%, transparent 35%),
    radial-gradient(circle at 45% 60%, rgba(15, 123, 108, 0.06) 0%, transparent 30%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  top: 40px;
  right: -20px;
  width: 600px;
  height: 600px;
  background-image:
    linear-gradient(rgba(15, 123, 108, 0.13) 1px, transparent 1px),
    linear-gradient(90deg, rgba(15, 123, 108, 0.13) 1px, transparent 1px);
  background-size: 36px 36px;
  border-radius: 50%;
  transform: rotate(15deg);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.hero__tags span {
  display: inline-block;
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 16px;
  border-radius: 20px;
}

.hero__title {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.2;
  max-width: 720px;
  color: var(--color-text);
  margin-bottom: 16px;
}

.hero__sub {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.hero__cta {
  display: inline-block;
  background-color: var(--color-accent);
  color: #FFFFFF;
  padding: 14px 32px;
  border-radius: 6px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color 0.2s ease;
}

.hero__desc {
  font-size: 18px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 640px;
  margin-bottom: 12px;
}

.hero__cta:hover {
  background-color: #0b6359;
}

/* ── Services / Expertise ─────────────────────────────── */

.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.card {
  background: #FFFFFF;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 32px;
  transition: border-color 0.2s ease;
}

.card:hover {
  border-color: var(--color-accent);
}

.card__icon {
  width: 48px;
  height: 48px;
  background: var(--color-accent-light);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.card__icon svg {
  width: 24px;
  height: 24px;
  stroke: var(--color-accent);
  fill: none;
  stroke-width: 2;
}

.card__title {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 8px;
}

.card__desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
}

.card__list {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

.card__list li {
  padding-left: 16px;
  position: relative;
}

.card__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* ── Tech Stack ──────────────────────────────────────── */

.techstack__groups {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.techstack__label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-text-secondary);
  margin-bottom: 12px;
}

.techstack__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.badge {
  display: inline-block;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  border-radius: 20px;
  padding: 6px 18px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.badge:hover {
  background: var(--color-accent);
  color: #FFFFFF;
}

/* ── Highlight Banner ────────────────────────────────── */

.highlight {
  background-color: var(--color-accent);
  padding: 64px 24px;
}

.highlight__text {
  font-size: 24px;
  font-weight: 600;
  color: #FFFFFF;
  line-height: 1.5;
  max-width: 720px;
  margin: 0 auto;
  font-style: italic;
}

/* ── Track Record ────────────────────────────────────── */

.track__stats {
  display: flex;
  justify-content: center;
  gap: 64px;
  margin-bottom: 64px;
  padding: 48px 0;
  border-bottom: 1px solid var(--color-border);
}

.stat {
  text-align: center;
}

.stat__number {
  font-size: 56px;
  font-weight: 700;
  color: var(--color-accent);
  display: block;
  line-height: 1;
}

.stat__label {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-top: 8px;
  display: block;
}

.track__projects {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.track__domain h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.track__domain ul {
  list-style: none;
}

.track__domain li {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  padding-left: 16px;
  position: relative;
}

.track__domain li::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 50%;
  position: absolute;
  left: 0;
  top: 11px;
}

/* ── Clients ─────────────────────────────────────────── */

.clients__text {
  font-size: 20px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  font-style: italic;
  margin-bottom: 48px;
}

.clients__sectors {
  display: flex;
  justify-content: center;
  gap: 48px;
  text-align: center;
}

.clients__sector {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  max-width: 240px;
}

.clients__sector-icon {
  width: 44px;
  height: 44px;
  background: var(--color-accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 4px;
}

.clients__sector-icon svg {
  stroke: var(--color-accent);
}

.clients__sector strong {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
}

.clients__sector span:last-child {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

/* ── About ───────────────────────────────────────────── */

.about__text {
  font-size: 17px;
  color: var(--color-text-secondary);
  line-height: 1.8;
  margin-bottom: 16px;
}

.about__values {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 48px;
}

.about__value h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.about__value p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ── Contact ─────────────────────────────────────────── */

.contact__text {
  font-size: 18px;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}

.contact__info {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 16px;
  color: var(--color-text-secondary);
}

.contact__link {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.contact__link:hover {
  text-decoration: underline;
}

.contact__divider {
  color: var(--color-border);
}

/* ── Footer ──────────────────────────────────────────── */

.footer {
  padding: 32px 24px;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 13px;
  color: var(--color-text-secondary);
}

/* ── Korean Font ─────────────────────────────────────── */

body.lang-ko {
  font-family: 'Noto Sans KR', 'Inter', sans-serif;
}

/* ── Language Toggle ────────────────────────────────── */

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  overflow: hidden;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
  padding: 0;
  background: none;
}

.lang-toggle__en,
.lang-toggle__ko {
  padding: 4px 8px;
  transition: all 0.2s ease;
}

.lang-toggle__en {
  background: var(--color-accent);
  color: #FFFFFF;
}

.lang-toggle__ko {
  background: transparent;
  color: var(--color-text-secondary);
}

.lang-toggle--ko .lang-toggle__en {
  background: transparent;
  color: var(--color-text-secondary);
}

.lang-toggle--ko .lang-toggle__ko {
  background: var(--color-accent);
  color: #FFFFFF;
}

/* ── Mobile Responsive ────────────────────────────────── */

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    flex-direction: column;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 24px;
    gap: 16px;
  }

  .nav__menu.active {
    display: flex;
  }

  .nav__cta {
    text-align: center;
  }

  .hero {
    padding-top: 120px;
  }

  .hero__title {
    font-size: 32px;
  }

  .section__title {
    font-size: 26px;
  }

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

  .track__stats {
    flex-direction: column;
    gap: 32px;
  }

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

  .clients__sectors {
    flex-direction: column;
    align-items: center;
    gap: 32px;
  }

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

  .highlight__text {
    font-size: 20px;
  }
}