:root {
  color-scheme: light;
  --paper: #f4f6f3;
  --surface: #fffef9;
  --ink: #171a1f;
  --muted: #66716b;
  --line: #cfd8d0;
  --green: #174f43;
  --green-soft: #dfece5;
  --blue: #284f8f;
  --gold: #c18426;
  --shadow: 0 18px 44px rgba(23, 26, 31, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background-color: var(--paper);
  color: var(--ink);
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(90deg, rgba(23, 79, 67, 0.08) 1px, transparent 1px),
    linear-gradient(rgba(40, 79, 143, 0.055) 1px, transparent 1px),
    var(--paper);
  background-size: 44px 44px;
  font: 16px/1.6 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

a {
  color: inherit;
}

.top-nav {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 254, 249, 0.86);
  backdrop-filter: blur(10px);
}

.top-nav__inner {
  display: flex;
  align-items: center;
  max-width: 1040px;
  min-height: 58px;
  margin: 0 auto;
  padding: 0 20px;
}

.top-nav__link {
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 760;
  text-decoration: none;
}

.top-nav__link:hover,
.top-nav__link:focus {
  color: var(--ink);
}

main.app {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
  padding: 54px 0 72px;
}

.app__hero {
  max-width: 720px;
  margin-bottom: 28px;
}

.app__hero-heading {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0 0 0.75rem;
  font-family: Georgia, "Iowan Old Style", "Times New Roman", serif;
  font-size: clamp(2.35rem, 5vw, 4.25rem);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1;
}

.app__hero-version {
  color: var(--muted);
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  font-size: 0.8rem;
  font-weight: 800;
  text-transform: uppercase;
}

.app__hero > p {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
}

.search-form {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 254, 249, 0.94);
  box-shadow: var(--shadow);
}

.search-form__help {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.search-form__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 10px;
  margin-bottom: 16px;
}

.search-form__grid input {
  min-height: 46px;
  width: 100%;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  outline: none;
  background: #ffffff;
  color: var(--ink);
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.search-form__grid input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(23, 79, 67, 0.14);
}

.search-form__actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.settings {
  position: relative;
}

.settings__toggle,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  border-radius: 8px;
  font-weight: 760;
  cursor: pointer;
}

.settings__toggle {
  gap: 9px;
  padding: 0 13px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
}

.settings__toggle:hover,
.settings__toggle:focus {
  border-color: var(--green);
  color: var(--ink);
}

.settings__chevron {
  width: 8px;
  height: 8px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px);
  transition: transform 160ms ease;
}

.settings__toggle[aria-expanded="true"] .settings__chevron {
  transform: rotate(225deg) translateY(-2px);
}

.settings__menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 10;
  min-width: 244px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.settings__option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.4;
}

.settings__option input {
  margin-top: 3px;
  accent-color: var(--green);
}

.btn {
  gap: 8px;
  padding: 0 18px;
  border: 1px solid var(--green);
  background: var(--green);
  color: var(--surface);
  transition:
    transform 100ms ease,
    background 160ms ease;
}

.btn:hover,
.btn:focus {
  background: #0f3d35;
}

.btn:active {
  transform: translateY(1px);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.72;
}

.results {
  margin-top: 42px;
}

.results__header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
}

.results__header h2 {
  margin: 0;
  font-family: Georgia, "Iowan Old Style", "Times New Roman", serif;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1;
}

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

.results__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.result {
  min-height: 148px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 10px 28px rgba(23, 26, 31, 0.06);
  transition:
    transform 160ms ease,
    border-color 160ms ease;
}

.result:hover {
  transform: translateY(-2px);
  border-color: rgba(23, 79, 67, 0.55);
}

.result__link {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--green);
  font-size: 1.04rem;
  font-weight: 760;
  line-height: 1.2;
  text-decoration: none;
}

.result__link:hover,
.result__link:focus {
  color: var(--blue);
}

.result__snippet {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.empty {
  margin-top: 36px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--muted);
  text-align: center;
}

.empty p {
  margin: 0;
}

@media (max-width: 600px) {
  .top-nav__inner {
    padding: 0 14px;
  }

  main.app {
    width: min(100% - 28px, 1040px);
    padding: 36px 0 54px;
  }

  .search-form {
    padding: 16px;
  }

  .search-form__actions {
    align-items: stretch;
    flex-direction: column;
  }

  .btn,
  .settings__toggle {
    width: 100%;
  }

  .settings__menu {
    left: 0;
    right: 0;
  }
}