:root {
  color-scheme: light;
  --bg-primary: #f4f5f6;
  --bg-secondary: #eceff1;
  --surface: rgba(255, 255, 255, 0.78);
  --surface-border: rgba(49, 58, 66, 0.12);
  --text-primary: #20262c;
  --text-secondary: #5f6972;
  --legal-note-color: #7b858f;
  --accent: #1b1b1b;
  --accent-contrast: #f8f5ef;
  --button-muted: rgba(32, 38, 44, 0.08);
  --shadow: 0 18px 60px rgba(45, 54, 62, 0.10);
}

body[data-theme="dark"] {
  color-scheme: dark;
  --bg-primary: #0f1115;
  --bg-secondary: #171b22;
  --surface: rgba(22, 27, 34, 0.78);
  --surface-border: rgba(255, 255, 255, 0.08);
  --text-primary: #f3f5f8;
  --text-secondary: #afb7c3;
  --legal-note-color: #8d97a3;
  --accent: #f3f5f8;
  --accent-contrast: #12151a;
  --button-muted: rgba(255, 255, 255, 0.08);
  --shadow: 0 20px 70px rgba(0, 0, 0, 0.45);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color 180ms ease, color 180ms ease;
}

.page-shell {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 20px;
}

.topbar {
  display: flex;
  justify-content: flex-end;
}

.controls {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.language-switch {
  display: inline-flex;
  gap: 8px;
}

.control-button {
  border: 1px solid var(--surface-border);
  background: var(--surface);
  color: var(--text-primary);
  border-radius: 999px;
  min-width: 56px;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  backdrop-filter: blur(12px);
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.control-button:hover,
.control-button:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.control-button.is-active,
.theme-button {
  background: var(--accent);
  color: var(--accent-contrast);
}

.hero {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.hero-card {
  width: min(100%, 680px);
  padding: 42px 28px;
  border-radius: 28px;
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.brand-logo {
  width: min(260px, 60vw);
  height: auto;
  display: block;
  margin: 0 auto 26px;
}

.eyebrow {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.headline {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.05;
}

.headline-main {
  display: block;
}

.headline-sub {
  display: block;
  margin-top: 10px;
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  line-height: 1.35;
  font-weight: 500;
  color: var(--text-secondary);
}

.message {
  margin: 18px auto 0;
  max-width: 34rem;
  font-size: 1.02rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.legal-note {
  width: min(100%, 680px);
  margin: 14px auto 0;
  max-width: 38rem;
  padding: 0 10px;
  font-size: 0.76rem;
  line-height: 1.45;
  color: var(--legal-note-color);
  text-align: center;
  opacity: 0.82;
}

@media (max-width: 640px) {
  .page-shell {
    padding: 16px;
  }

  .hero-card {
    padding: 34px 20px;
    border-radius: 24px;
  }
}