:root {
  --bg-primary: #0b0b0f;
  --bg-secondary: #13131a;
  --text-primary: #f5f7ff;
  --text-secondary: #b8bdd2;
  --accent-primary: #9b8cff;
  --accent-secondary: #6e5bff;
  --border-subtle: #262637;
  --container: 1120px;

  --radial-accent: #1e193b;
  --header-bg: rgba(11, 11, 15, 0.72);
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.28);

  --card-bg-start: rgba(22, 22, 30, 0.95);
  --card-bg-end: rgba(14, 14, 20, 0.9);
  --terminal-card-bg: rgba(19, 19, 26, 0.8);
  --terminal-divider: rgba(255, 255, 255, 0.08);
  --step-bg: rgba(19, 19, 26, 0.7);
  --faq-item-bg: rgba(17, 17, 24, 0.8);
  --cta-bg-start: rgba(24, 20, 42, 0.95);
  --cta-bg-end: rgba(13, 13, 19, 0.96);

  --mobile-nav-bg: rgba(11, 11, 15, 0.96);
  --control-bg: rgba(19, 19, 26, 0.7);
  --input-bg: rgba(17, 17, 24, 0.85);

  --form-error: #ff6b6b;
}

html[data-theme="light"] {
  --bg-primary: #f7f7fb;
  --bg-secondary: #ffffff;
  --text-primary: #0f1020;
  --text-secondary: #4a4c66;
  --border-subtle: #e6e7f0;

  --radial-accent: rgba(155, 140, 255, 0.22);
  --header-bg: rgba(255, 255, 255, 0.72);
  --shadow-lg: 0 20px 60px rgba(34, 12, 90, 0.12);

  --card-bg-start: rgba(255, 255, 255, 0.92);
  --card-bg-end: rgba(248, 248, 255, 0.96);
  --terminal-card-bg: rgba(255, 255, 255, 0.9);
  --terminal-divider: rgba(15, 16, 32, 0.12);
  --step-bg: rgba(255, 255, 255, 0.78);
  --faq-item-bg: rgba(255, 255, 255, 0.95);
  --cta-bg-start: rgba(232, 228, 255, 0.92);
  --cta-bg-end: rgba(255, 255, 255, 0.98);

  --mobile-nav-bg: rgba(255, 255, 255, 0.96);
  --control-bg: rgba(255, 255, 255, 0.82);
  --input-bg: rgba(255, 255, 255, 0.95);

  --form-error: #c62828;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "Pretendard", "Noto Sans KR", sans-serif;
  background: radial-gradient(circle at top right, var(--radial-accent) 0%, var(--bg-primary) 36%);
  color: var(--text-primary);
  line-height: 1.6;
}

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

.container {
  width: min(100% - 2rem, var(--container));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-subtle);
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 1rem;
  min-width: 0;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 40px;
  padding: 0 0.9rem;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: var(--control-bg);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 600;
}

.lang-select {
  height: 40px;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: var(--control-bg);
  color: var(--text-primary);
  padding: 0 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  gap: 1.25rem;
}

.site-nav a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

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

.menu-toggle {
  display: none;
  background: transparent;
  border: 0;
  padding: 0.4rem;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  border-radius: 20px;
  background: var(--text-primary);
  margin: 4px 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.1rem;
  border-radius: 12px;
  border: 1px solid transparent;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: #ffffff;
}

.btn-small {
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-subtle);
  color: var(--text-primary);
}

.hero {
  padding: 6rem 0 4rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 1rem;
  color: var(--accent-primary);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
}

h1,
h2,
h3 {
  line-height: 1.25;
  margin: 0 0 0.8rem;
}

h1 {
  font-size: clamp(2rem, 4vw, 3.4rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  margin-bottom: 1.4rem;
}

.hero-copy {
  color: var(--text-secondary);
  margin-bottom: 1.4rem;
  max-width: 62ch;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

.hero-visual .terminal-card {
  background: var(--terminal-card-bg);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.2rem;
  box-shadow: var(--shadow-lg);
}

.terminal-card p {
  margin: 0;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--terminal-divider);
  color: var(--text-secondary);
}

.terminal-card p:last-child {
  border-bottom: 0;
}

.section {
  padding: 4.5rem 0;
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.card-grid.four {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.card-grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.card {
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.2rem;
  background: linear-gradient(180deg, var(--card-bg-start), var(--card-bg-end));
}

.meta {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

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

.step {
  padding: 1rem;
  border-left: 2px solid var(--accent-primary);
  background: var(--step-bg);
  border-radius: 12px;
}

.step span {
  color: var(--accent-primary);
  font-weight: 700;
  font-size: 0.88rem;
}

.faq-list {
  display: grid;
  gap: 0.7rem;
}

.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  background: var(--faq-item-bg);
}

.faq-q {
  all: unset;
  display: block;
  width: 100%;
  cursor: pointer;
  padding: 1rem;
  font-weight: 600;
}

.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 240ms ease;
}

.faq-item.open .faq-a {
  max-height: 200px;
}

.faq-a p {
  margin: 0;
  padding: 0 1rem 1rem;
  color: var(--text-secondary);
}

.cta-box {
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  background: linear-gradient(130deg, var(--cta-bg-start), var(--cta-bg-end));
  padding: clamp(1.2rem, 3vw, 2.4rem);
  text-align: center;
}

.contact-form {
  margin-top: 1.4rem;
  max-width: 720px;
  margin-inline: auto;
  text-align: left;
  display: grid;
  gap: 1rem;
}

.field {
  display: grid;
  gap: 0.5rem;
}

.field label {
  font-weight: 700;
}

.contact-form textarea {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: var(--input-bg);
  color: var(--text-primary);
  padding: 0.95rem 1rem;
  outline: none;
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
  resize: vertical;
}

.contact-form textarea:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px rgba(155, 140, 255, 0.18);
}

.form-hint {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.form-error {
  min-height: 1.2em;
  color: var(--form-error);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--border-subtle);
  padding: 1.4rem 0 2rem;
}

.footer-wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 360ms ease, transform 360ms ease;
}

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

@media (max-width: 1023px) {
  .card-grid.four,
  .card-grid.three,
  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 767px) {
  .menu-toggle {
    display: inline-block;
  }

  .site-nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--mobile-nav-bg);
    border-bottom: 1px solid var(--border-subtle);
    padding: 1rem;
    flex-direction: column;
  }

  .site-nav.open {
    display: flex;
  }

  .nav-wrap > .btn-small {
    display: none;
  }

  .theme-toggle {
    height: 36px;
    padding: 0 0.7rem;
    font-size: 0.92rem;
  }

  .lang-select {
    height: 36px;
    font-size: 0.92rem;
    padding: 0 0.7rem;
  }

  .card-grid.two,
  .card-grid.three,
  .card-grid.four,
  .steps,
  .footer-wrap {
    grid-template-columns: 1fr;
    display: grid;
  }

  .hero {
    padding-top: 4.6rem;
  }
}