:root {
  --color-bg: #ffffff;
  --color-bg-soft: #eef2ff;
  --color-bg-soft-2: #e6e9fb;
  --color-text: #171426;
  --color-muted: #5b5770;
  --color-primary: #7c3aed;
  --color-primary-dark: #6425d0;
  --color-primary-light: #a78bfa;
  --color-border: #ece9f9;
  --container-width: 640px;
  --radius-lg: 28px;
  --radius-md: 20px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

.accent {
  color: var(--color-primary);
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.logo {
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.logo-image {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.logo-image img {
  height: 42px;
  width: auto;
}

.logo-image .logo-mark {
  height: 52px;
}

.menu-toggle {
  width: 36px;
  height: 36px;
  border: none;
  background: none;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  cursor: pointer;
  padding: 0;
}

.menu-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.lang-switch {
  display: flex;
  border: 1.5px solid var(--color-border);
  border-radius: 999px;
  padding: 3px;
  gap: 2px;
}

.lang-switch button {
  border: none;
  background: none;
  color: var(--color-muted);
  font-weight: 700;
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: 999px;
  cursor: pointer;
  line-height: 1;
}

.lang-switch button.is-active {
  background: var(--color-primary);
  color: #fff;
}

.nav {
  display: none;
  flex-direction: column;
  padding: 8px 24px 20px;
  max-width: var(--container-width);
  margin: 0 auto;
}

.nav.open {
  display: flex;
}

.nav a {
  padding: 10px 0;
  color: var(--color-text);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

.nav a:hover {
  color: var(--color-primary);
}

/* Hero */

.hero {
  text-align: center;
  padding: 32px 0 56px;
}

.hero-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 20px 40px -20px rgba(124, 58, 237, 0.35);
  margin-bottom: 40px;
}

.hero-image img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.05rem;
  color: var(--color-muted);
  margin: 0 0 32px;
}

.cta {
  display: inline-block;
  padding: 16px 40px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
  color: #fff;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  box-shadow: 0 12px 24px -8px rgba(124, 58, 237, 0.55);
}

/* Intro */

.intro {
  text-align: center;
  padding: 64px 0;
  background: linear-gradient(180deg, var(--color-bg-soft), var(--color-bg-soft-2));
}

.icon-badge {
  width: 76px;
  height: 76px;
  margin: 0 auto 28px;
  border-radius: 50%;
  background: #f1ecff;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.icon-badge svg {
  width: 34px;
  height: 34px;
}

.intro h2,
.projects h2,
.stats h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.intro p,
.projects > .container > p,
.stats p {
  color: var(--color-muted);
  max-width: 480px;
  margin: 0 auto;
}

/* Feature cards */

.features {
  padding: 64px 0;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.feature-card {
  text-align: center;
}

.feature-media {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 16px 32px -18px rgba(23, 20, 38, 0.25);
  padding: 24px;
  margin-bottom: 24px;
}

.feature-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  object-fit: cover;
}

.feature-card h3 {
  margin: 0 0 12px;
  font-size: 1.35rem;
  font-weight: 800;
}

.feature-card p {
  color: var(--color-muted);
  max-width: 420px;
  margin: 0 auto;
}

/* AlsChat */

.aischat {
  text-align: center;
  padding: 64px 0;
  background: linear-gradient(180deg, var(--color-bg-soft), var(--color-bg-soft-2));
}

.badge {
  display: inline-block;
  background: #fff;
  color: var(--color-primary);
  font-weight: 700;
  font-size: 0.85rem;
  padding: 8px 18px;
  border-radius: 999px;
  margin-bottom: 20px;
  box-shadow: 0 6px 16px -8px rgba(23, 20, 38, 0.25);
}

.aischat h2 {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.35;
  margin: 0 0 20px;
}

.aischat-content p {
  color: var(--color-muted);
  max-width: 480px;
  margin: 0 auto 24px;
}

.text-link {
  display: inline-block;
  color: var(--color-primary);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--color-primary);
  padding-bottom: 4px;
  margin-bottom: 40px;
}

.aischat-media {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: 0 20px 40px -20px rgba(23, 20, 38, 0.3);
  max-width: 360px;
  margin: 0 auto;
}

.aischat-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-md);
  object-fit: cover;
}

/* Projects */

.projects {
  text-align: center;
  padding: 64px 0;
}

.project-list {
  display: grid;
  gap: 20px;
  margin-top: 40px;
}

.project-card {
  padding: 48px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, #ffffff, #f2edfd);
  border: 1px solid var(--color-border);
}

.project-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.project-card-link:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px -18px rgba(23, 20, 38, 0.3);
}

.project-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  border-radius: 16px;
  background: linear-gradient(150deg, #e4d9fb, #cbb8f7);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

.project-icon svg {
  width: 26px;
  height: 26px;
}

.project-icon-logo {
  width: 84px;
  height: 84px;
  background: #ffffff;
  border: 1px solid var(--color-border);
  padding: 10px;
  overflow: hidden;
}

.project-icon-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.project-card h3 {
  margin: 0 0 6px;
  font-size: 1.2rem;
  font-weight: 800;
}

.project-card .soon {
  color: var(--color-muted);
  margin: 0;
}

/* Stats */

.stats {
  text-align: center;
  padding: 64px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 40px;
}

.stat-card {
  padding: 32px 16px;
  border-radius: var(--radius-md);
  background: linear-gradient(160deg, #ffffff, #f5f2fd);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-num {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--color-primary);
}

.stat-label {
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* Contact */

.contact {
  text-align: center;
  padding: 64px 0;
  background: linear-gradient(180deg, var(--color-bg-soft), var(--color-bg-soft-2));
}

.contact h2 {
  font-size: 1.6rem;
  font-weight: 800;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.contact > .container > p {
  color: var(--color-muted);
  max-width: 480px;
  margin: 0 auto 32px;
}

.contact-form {
  max-width: 440px;
  margin: 0 auto;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: 0 20px 40px -24px rgba(23, 20, 38, 0.3);
  text-align: left;
}

.form-row {
  margin-bottom: 18px;
}

.form-row label {
  display: block;
  font-weight: 700;
  font-size: 0.85rem;
  margin-bottom: 6px;
}

.form-row input,
.form-row textarea {
  width: 100%;
  border: 1.5px solid var(--color-border);
  border-radius: 12px;
  padding: 12px 14px;
  font-family: inherit;
  font-size: 0.95rem;
  color: var(--color-text);
  background: #fbfaff;
  resize: vertical;
}

.form-row input:focus,
.form-row textarea:focus {
  outline: none;
  border-color: var(--color-primary-light);
}

.contact-submit {
  width: 100%;
  border: none;
  cursor: pointer;
  font-size: 1rem;
}

.form-status {
  margin: 16px 0 0;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.2em;
}

.form-status.success {
  color: #16a34a;
}

.form-status.error {
  color: #dc2626;
}

/* Footer */

.site-footer {
  padding: 48px 0 32px;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
  background: linear-gradient(180deg, var(--color-bg-soft-2), var(--color-bg-soft));
}

.footer-logo {
  margin-bottom: 16px;
}

.copyright {
  margin: 0 0 20px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

.footer-links a {
  color: var(--color-muted);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-primary);
}

/* Legal / content pages */

.legal-page {
  padding: 56px 0 72px;
}

.legal-page .container {
  max-width: 720px;
}

.legal-page h1 {
  font-size: 2rem;
  font-weight: 800;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.legal-page .updated {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin: 0 0 40px;
}

.legal-page h2 {
  font-size: 1.15rem;
  font-weight: 800;
  margin: 36px 0 12px;
}

.legal-page p,
.legal-page li {
  color: var(--color-muted);
  margin: 0 0 14px;
}

.legal-page ul {
  padding-left: 20px;
  margin: 0 0 14px;
}

.legal-page a {
  color: var(--color-primary);
  font-weight: 600;
}

/* Responsive */

@media (min-width: 720px) {
  .nav {
    display: flex !important;
    flex-direction: row;
    padding: 0;
    max-width: none;
  }

  .nav a {
    border-bottom: none;
    margin-left: 28px;
    padding: 0;
  }

  .menu-toggle {
    display: none;
  }

  .header-inner {
    max-width: var(--container-width);
  }

  .hero-title {
    font-size: 3rem;
  }

  .features {
    flex-direction: row;
    align-items: stretch;
  }

  .feature-card {
    flex: 1;
  }

  .project-list {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  :root {
    --container-width: 1160px;
  }

  .hero-inner {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    align-items: center;
    gap: 72px;
    text-align: left;
  }

  .hero-image {
    margin-bottom: 0;
  }

  .hero-content {
    text-align: left;
  }

  .hero-title {
    font-size: 3.4rem;
  }

  .hero-sub {
    max-width: 460px;
  }

  .intro > .container > p {
    max-width: 600px;
  }

  .features {
    gap: 56px;
  }

  .feature-card {
    max-width: 480px;
    margin: 0 auto;
  }

  .aischat-inner {
    display: grid;
    grid-template-columns: 1fr 0.95fr;
    align-items: center;
    gap: 72px;
    text-align: left;
  }

  .aischat-content {
    text-align: left;
  }

  .aischat-content p {
    margin: 0 0 24px;
    max-width: 440px;
  }

  .aischat-media {
    max-width: none;
    margin: 0;
  }

  .stats-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}