:root {
  color-scheme: light;
  --page-bg: #f5f7fb;
  --page-bg-bottom: #ffffff;
  --page-glow: rgba(37, 99, 235, 0.12);
  --bg-soft: rgba(15, 23, 42, 0.04);
  --surface: rgba(255, 255, 255, 0.82);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --card: rgba(255, 255, 255, 0.92);
  --border: rgba(15, 23, 42, 0.1);
  --border-strong: rgba(15, 23, 42, 0.16);
  --text: #0f172a;
  --muted: rgba(15, 23, 42, 0.7);
  --accent: #2563eb;
  --accent-strong: #0ea5e9;
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page-bg: #0b1020;
    --page-bg-bottom: #070a14;
    --page-glow: rgba(124, 140, 255, 0.22);
    --bg-soft: rgba(255, 255, 255, 0.06);
    --surface: rgba(10, 15, 28, 0.72);
    --surface-strong: rgba(16, 22, 40, 0.82);
    --card: rgba(16, 22, 40, 0.9);
    --border: rgba(255, 255, 255, 0.12);
    --border-strong: rgba(255, 255, 255, 0.2);
    --text: #f4f7fb;
    --muted: rgba(244, 247, 251, 0.72);
    --accent: #7c8cff;
    --accent-strong: #98a4ff;
    --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: auto;
}

body {
  margin: 0;
  font-family: "Pretendard", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, var(--page-glow), transparent 38%),
    linear-gradient(180deg, var(--page-bg) 0%, var(--page-bg-bottom) 100%);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

::selection {
  background: rgba(37, 99, 235, 0.18);
}

.container {
  width: min(1140px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header {
  position: -webkit-sticky;
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(18px);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: 0 0 auto;
}

.brand-logo,
.footer-logo,
.bot-preview {
  object-fit: cover;
  border-radius: 16px;
}

.brand-logo {
  width: 48px;
  height: 48px;
}

.footer-logo {
  width: 44px;
  height: 44px;
}

.brand-logo,
.footer-logo {
  border: 1px solid var(--border);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.12);
}

.bot-preview {
  width: 92px;
  height: 92px;
  border-radius: 24px;
  box-shadow: var(--shadow);
}

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

.brand strong,
.footer-brand strong {
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.brand small {
  color: var(--muted);
  font-size: 0.84rem;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav-menu-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  height: 42px;
  padding: 0 12px;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
}

.nav-menu-toggle-icon,
.nav-menu-toggle-icon::before,
.nav-menu-toggle-icon::after {
  display: block;
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: currentColor;
  transition: transform 0.2s ease, opacity 0.2s ease;
  content: "";
}

.nav-menu-toggle-icon {
  position: relative;
}

.nav-menu-toggle-icon::before {
  position: absolute;
  top: -5px;
  left: 0;
}

.nav-menu-toggle-icon::after {
  position: absolute;
  top: 5px;
  left: 0;
}

.nav-menu-toggle-label {
  font-size: 0.84rem;
  font-weight: 700;
}

.nav-menu-toggle[aria-expanded="true"] .nav-menu-toggle-icon {
  transform: rotate(45deg);
}

.nav-menu-toggle[aria-expanded="true"] .nav-menu-toggle-icon::before {
  transform: translateY(5px) rotate(-90deg);
}

.nav-menu-toggle[aria-expanded="true"] .nav-menu-toggle-icon::after {
  opacity: 0;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--muted);
}

.nav-links a {
  transition: color 0.2s ease;
}

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

.nav-links a[aria-current="page"] {
  color: var(--text);
  font-weight: 700;
}

.nav-links a.is-active {
  color: var(--text);
  font-weight: 700;
}

.nav-links a:focus-visible,
.nav-invite-btn:focus-visible,
.nav-menu-toggle:focus-visible,
.button:focus-visible,
.faq-item summary:focus-visible,
.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.nav-invite-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
  color: #fff;
  font-size: 0.92rem;
  font-weight: 700;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, filter 0.2s ease;
}

@media (prefers-color-scheme: dark) {
  .nav-invite-btn {
  background: linear-gradient(135deg, #7c8cff, #98a4ff);
  color: #0b1020;
  }
}

.nav-invite-btn:hover {
  transform: translateY(-1px);
  filter: brightness(1.04);
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 36px;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -10%;
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.15), transparent 70%);
  animation: float 6s ease-in-out infinite;
  pointer-events: none;
  z-index: -1;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: stretch;
}

.hero-copy,
.hero-card,
.feature-card,
.notice-card,
.policy-card,
.stat-card,
.command-card,
.callout-card {
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-copy {
  padding: 44px;
  border-radius: 30px;
}

.hero-card {
  padding: 24px;
  border-radius: 30px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 16px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 800;
}

.hero h1,
.policy-hero h1 {
  margin: 0;
  line-height: 1.08;
  letter-spacing: -0.05em;
  font-size: clamp(1.7rem, 3.2vw, 2.8rem);
  word-break: keep-all;
}

.desktop-break {
  display: inline;
}

.hero h1 {
  font-size: clamp(1.75rem, 2.8vw, 2.5rem);
}

.hero p,
.section-heading p,
.policy-hero p,
.bot-description,
.feature-card p,
.notice-card li,
.policy-card p,
.policy-card li,
.stat-card p,
.principle-list p,
.command-list p,
.command-note,
.callout-card p,
.site-footer p {
  color: var(--muted);
}

.hero p {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 1.06rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 14px;
  font-weight: 700;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, #2563eb, #0ea5e9);
}

@media (prefers-color-scheme: dark) {
  .button-primary {
    background: linear-gradient(135deg, #7c8cff, #98a4ff);
    color: #0b1020;
  }
}

.button-secondary {
  border: 1px solid var(--border-strong);
  background: var(--surface-strong);
}

.trust-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.trust-strip span,
.command-badge,
.stat-card span {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
}

.trust-strip span {
  flex: 0 1 auto;
  white-space: normal;
  word-break: keep-all;
  text-align: center;
}

.bot-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: center;
  padding: 8px 8px 20px;
}

.bot-label {
  margin: 0 0 6px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.bot-card h2 {
  margin: 0 0 8px;
  font-size: 1.55rem;
  letter-spacing: -0.03em;
}

.info-grid,
.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.hero-stats,
.command-list,
.notice-card ul,
.policy-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.hero-stats {
  display: grid;
  gap: 12px;
  margin-top: 28px;
}

.hero-stats li,
.info-grid article,
.metric-grid article {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 18px;
  background: var(--bg-soft);
}

.hero-stats strong,
.info-grid strong,
.metric-grid strong {
  display: block;
  margin-bottom: 4px;
  letter-spacing: -0.02em;
}

.section {
  padding: 36px 0;
}

#bot {
  padding-bottom: 52px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 22px;
}

.section-heading.left {
  margin-bottom: 18px;
}

.section-heading span {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.section-heading h2,
.policy-card h2,
.notice-card h3,
.callout-card h2 {
  margin: 10px 0 10px;
  letter-spacing: -0.04em;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
}

.feature-grid,
.command-grid,
.split {
  display: grid;
  gap: 18px;
}

.feature-card,
.notice-card,
.policy-card,
.command-card,
.callout-card {
  border-radius: 24px;
  padding: 24px;
}

.command-card-head strong,
.principle-list strong {
  display: block;
  margin: 12px 0 10px;
  letter-spacing: -0.03em;
  font-size: 1.06rem;
}

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

.feature-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  letter-spacing: -0.03em;
}

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

.command-categories {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.command-card {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 24px;
  background: var(--card);
  backdrop-filter: blur(18px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.command-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(37, 99, 235, 0.12);
}

.command-card h3 {
  margin: 0 0 16px;
  font-size: 1.06rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.command-list {
  display: grid;
  gap: 8px;
}

.command-list span {
  padding: 8px 12px;
  border-radius: 12px;
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  font-family: monospace;
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 600;
}

.cta-banner {
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: var(--shadow);
  border-radius: 24px;
  padding: 30px;
  text-align: center;
}

.cta-banner h2 {
  margin: 0 0 8px;
  letter-spacing: -0.03em;
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
}

.cta-banner p {
  margin: 0;
  color: var(--muted);
}

.cta-actions {
  margin-top: 20px;
  display: flex;
  justify-content: center;
}

.command-card-accent {
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.12), transparent 40%),
    var(--card);
}

.command-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
}

.command-badge-admin {
  color: var(--accent);
  background: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.18);
}

.command-note {
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: var(--bg-soft);
  border-radius: 14px;
}

.split {
  grid-template-columns: 1.1fr 0.9fr;
  align-items: start;
}

.principle-list {
  display: grid;
  gap: 14px;
}

.principle-list article {
  padding: 18px 20px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
}

.notice-card ul,
.policy-card ul {
  display: grid;
  gap: 10px;
  padding-left: 18px;
  list-style: disc;
}

.notice-card li,
.policy-card li {
  color: var(--muted);
}

.invite-button {
  margin-top: 18px;
}

.callout-section {
  padding-top: 10px;
}

.callout-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.callout-card p {
  margin: 0;
  max-width: 62ch;
}

.page-content {
  padding-bottom: 24px;
}

.policy-page {
  padding: 58px 0 72px;
}

.policy-hero {
  margin-bottom: 24px;
}

.policy-card + .policy-card {
  margin-top: 18px;
}

.policy-footer {
  margin-top: 28px;
}

.site-footer {
  padding: 68px 0 54px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.faq-list {
  display: grid;
  gap: 12px;
  margin-top: 20px;
  max-width: 800px;
}

.faq-item {
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 0;
  background: var(--card);
  backdrop-filter: blur(18px);
  overflow: hidden;
}

.faq-item summary {
  padding: 18px 20px;
  cursor: pointer;
  font-weight: 600;
  letter-spacing: -0.02em;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.2s ease;
}

.faq-item summary:hover {
  background: var(--bg-soft);
}

.faq-item summary:focus-visible {
  background: var(--bg-soft);
}

.faq-item summary::after {
  content: "▼";
  display: inline-block;
  margin-left: 8px;
  color: var(--accent);
  font-size: 0.8rem;
  transition: transform 0.3s ease;
}

.faq-item[open] summary::after {
  transform: rotate(180deg);
}

.faq-item p {
  margin: 0;
  padding: 0 20px 18px;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(4, minmax(180px, 1fr));
  gap: 40px;
  padding: 60px 0 40px;
  border-bottom: 1px solid var(--border);
}

.footer-section h4 {
  margin: 0 0 16px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
}

.footer-section ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-section a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s ease;
  font-size: 0.9rem;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.footer-section a:hover {
  color: var(--text);
}

.footer-bottom {
  text-align: center;
  padding: 30px 0;
}

.footer-bottom p {
  margin: 8px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-copyright {
  font-size: 0.85rem;
  opacity: 0.6;
}

.link-inline {
  color: var(--accent);
  border-bottom: 1px solid currentColor;
}

.footer-grid {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-brand p {
  margin: 2px 0 0;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--muted);
}

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

.button-secondary:hover {
  border-color: var(--accent-strong);
}

@media (max-width: 960px) {
  .hero-grid,
  .feature-grid,
  .split,
  .command-grid,
  .stats-grid,
  .command-categories {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr 1fr;
    gap: 30px;
  }

  .nav {
    flex-wrap: wrap;
    align-items: center;
  }

  .nav-menu-toggle {
    display: inline-flex;
  }

  .nav-actions {
    display: none;
    width: 100%;
    margin-top: 10px;
    padding: 14px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface-strong);
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .nav-actions.is-open {
    display: flex;
  }

  .nav-links {
    flex-direction: column;
    gap: 10px;
  }

  .footer-grid {
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
  }

  .callout-card {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-invite-btn {
    width: 100%;
    justify-content: center;
  }

  .footer-links,
  .footer-brand {
    justify-content: center;
  }
}

@media (min-width: 641px) and (max-width: 1024px) and (orientation: portrait) {
  .home-page .hero-card {
    display: none;
  }
}

@media (max-width: 640px) {
  .container {
    width: min(calc(100% - 24px), 1140px);
  }

  .home-page .hero-card {
    display: none;
  }

  .brand-logo {
    width: 42px;
    height: 42px;
  }

  .nav-menu-toggle {
    padding: 0 10px;
  }

  .nav-menu-toggle-label {
    display: none;
  }

  .hero {
    padding-top: 38px;
  }

  .desktop-break {
    display: none;
  }

  .hero-copy,
  .hero-card,
  .feature-card,
  .notice-card,
  .policy-card,
  .stat-card,
  .command-card,
  .callout-card {
    border-radius: 22px;
    padding: 22px;
  }

  .hero-copy {
    padding: 26px;
  }

  .hero h1 {
    font-size: clamp(1.45rem, 7vw, 1.85rem);
    letter-spacing: -0.03em;
    line-height: 1.18;
  }

  .command-list span {
    padding: 10px 14px;
    font-size: 0.95rem;
  }

  .faq-item summary {
    padding: 20px;
    font-size: 0.96rem;
  }

  .faq-item p {
    padding: 0 20px 20px;
    font-size: 0.94rem;
  }

  .footer-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .info-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .cta-actions .button {
    width: 100%;
  }

}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}