:root {
  --bg: #ffffff;
  --text: #111111;
  --muted: #5f6368;
  --line: #e8e8eb;
  --surface: #f7f7f8;
  --surface-strong: #f1f2f4;
  --accent: #111111;
  --max-width: 1040px;
  --radius: 16px;
  --radius-sm: 10px;
  --space-1: 8px;
  --space-2: 12px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  --space-6: 48px;
  --space-7: 72px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "SF Pro Text", "PingFang SC", -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}

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

img {
  max-width: 100%;
}

.container {
  width: min(var(--max-width), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(17, 17, 17, 0.06);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  gap: var(--space-3);
}

.header-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}

.brand {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}

.nav a {
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 0.93rem;
  color: var(--muted);
}

.nav a:hover,
.nav a:focus-visible {
  background: var(--surface);
  color: var(--text);
}

.nav a.active {
  color: var(--text);
  font-weight: 600;
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
}

.lang-tab {
  border: 0;
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
}

.lang-tab.active {
  color: var(--text);
  background: var(--surface);
}

.lang-tab:focus-visible {
  outline: 2px solid #9ab6ff;
  outline-offset: 2px;
}

.hero {
  padding: var(--space-7) 0 var(--space-6);
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.8rem, 5.2vw, 2.85rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero p {
  margin: var(--space-4) 0 0;
  max-width: 820px;
  color: var(--muted);
  font-size: 1.06rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-5);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 11px 18px;
  border-radius: 999px;
  border: 1px solid var(--accent);
  font-size: 0.94rem;
  font-weight: 600;
  transition: 0.2s ease;
}

.btn.primary {
  background: var(--accent);
  color: #ffffff;
}

.btn.primary:hover,
.btn.primary:focus-visible {
  background: #2a2a2a;
  border-color: #2a2a2a;
}

.btn.ghost {
  color: var(--text);
  border-color: var(--line);
  background: #ffffff;
}

.btn.ghost:hover,
.btn.ghost:focus-visible {
  background: var(--surface);
}

.section {
  padding: var(--space-6) 0;
}

.section + .section {
  border-top: 1px solid var(--line);
}

.section h2 {
  margin: 0;
  font-size: clamp(1.25rem, 3.8vw, 1.8rem);
  letter-spacing: -0.01em;
}

.section-intro {
  margin: var(--space-3) 0 0;
  color: var(--muted);
  max-width: 820px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-top: var(--space-5);
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  background: #ffffff;
}

.card h3 {
  margin: 0;
  font-size: 1rem;
}

.card p,
.card li {
  margin: var(--space-2) 0 0;
  color: var(--muted);
  font-size: 0.96rem;
}

.card ul {
  margin: 0;
  padding-left: 1.2rem;
}

.muted-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--space-4);
  margin-top: var(--space-4);
}

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

.legal h1 {
  margin: 0;
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  letter-spacing: -0.02em;
}

.legal .meta {
  margin-top: var(--space-2);
  color: var(--muted);
  font-size: 0.95rem;
}

.legal-section {
  margin-top: var(--space-5);
}

.legal-section h2 {
  margin: 0;
  font-size: 1.08rem;
}

.legal-section p {
  margin: var(--space-2) 0 0;
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: var(--space-5) 0;
}

.footer-top {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-brand {
  font-weight: 600;
}

.footer-sub {
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  color: var(--muted);
  font-size: 0.95rem;
}

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

.lang-note {
  font-size: 0.93rem;
  color: var(--muted);
}

.contact-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.contact-list li + li {
  margin-top: var(--space-2);
}

[data-lang-item][hidden] {
  display: none !important;
}

@media (min-width: 760px) {
  .grid.two {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-top {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
  }
}