:root {
  --bg: #f4efe6;
  --ink: #241f1a;
  --muted: #766b5d;
  --line: rgba(54, 43, 31, 0.14);
  --panel: #fffaf1;
  --panel-strong: #e5d5bd;
  --green: #334226;
  --green-soft: #536241;
  --copper: #b8793d;
  --cream: #fff5df;
  --shadow: 0 18px 48px rgba(45, 36, 24, 0.12);
  color-scheme: only light;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--bg);
  color-scheme: only light;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  font-family: Inter, "Noto Sans SC", "Microsoft YaHei", sans-serif;
  background:
    repeating-linear-gradient(90deg, rgba(80, 61, 39, 0.045) 0 1px, transparent 1px 26px),
    var(--bg);
  color-scheme: only light;
}

a {
  color: inherit;
}

button {
  font: inherit;
}

.container {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(244, 239, 230, 0.18);
  background: rgba(51, 66, 38, 0.93);
  backdrop-filter: blur(18px);
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
}

.site-wordmark {
  color: #efbd72;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 23px;
  font-style: italic;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-decoration: none;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.main-nav a,
.submenu-toggle {
  color: rgba(255, 245, 223, 0.78);
  font-size: 0.88rem;
  text-decoration: none;
}

.main-nav a:hover,
.main-nav a.active {
  color: #fff5df;
}

.nav-group {
  position: relative;
  display: flex;
  align-items: center;
  gap: 5px;
}

.submenu-toggle,
.nav-toggle {
  border: 0;
  color: rgba(255, 245, 223, 0.82);
  background: transparent;
}

.submenu {
  position: absolute;
  top: calc(100% + 14px);
  left: -12px;
  display: none;
  min-width: 150px;
  padding: 8px;
  border: 1px solid rgba(255, 245, 223, 0.2);
  border-radius: 8px;
  background: #27331f;
  box-shadow: 0 18px 40px rgba(17, 22, 14, 0.25);
}

.nav-group:hover .submenu,
.nav-group:focus-within .submenu {
  display: grid;
  gap: 4px;
}

.submenu a {
  padding: 8px 10px;
  border-radius: 6px;
}

.submenu a:hover {
  background: rgba(255, 245, 223, 0.08);
}

.nav-toggle {
  display: none;
}

.nav-toggle span:not(.sr-only) {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px 0;
  background: currentColor;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.gear-hero {
  padding: 72px 0 44px;
  color: var(--cream);
  background:
    repeating-linear-gradient(90deg, rgba(255, 245, 223, 0.035) 0 1px, transparent 1px 26px),
    linear-gradient(180deg, rgba(51, 66, 38, 0.94), rgba(51, 66, 38, 0.9));
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 48px;
  align-items: end;
}

.back-link {
  display: inline-flex;
  margin-bottom: 18px;
  color: rgba(255, 245, 223, 0.72);
  font-size: 0.84rem;
  text-decoration: none;
}

h1,
h2,
h3 {
  margin: 0;
  font-family: Georgia, "Noto Serif SC", serif;
  font-weight: 500;
}

h1 {
  max-width: 760px;
  font-size: clamp(3rem, 7vw, 6.2rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.hero-copy p {
  max-width: 720px;
  margin: 24px 0 0;
  color: rgba(255, 245, 223, 0.78);
  font-size: 1rem;
  line-height: 1.9;
}

.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.hero-stats div {
  min-height: 112px;
  padding: 18px;
  border: 1px solid rgba(255, 245, 223, 0.2);
  border-radius: 8px;
  background: rgba(255, 245, 223, 0.08);
}

.hero-stats span,
.hero-stats small {
  display: block;
}

.hero-stats span {
  font-family: Georgia, serif;
  font-size: 2.4rem;
  line-height: 1;
}

.hero-stats small {
  margin-top: 12px;
  color: rgba(255, 245, 223, 0.68);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

.keyboard-section {
  padding: 34px 0 72px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
}

.section-head h2 {
  font-size: clamp(2rem, 4vw, 3.4rem);
  color: var(--green);
}

.section-head p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.view-note,
.card-toggle,
.carousel-button {
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--green);
  background: rgba(255, 250, 241, 0.82);
  cursor: pointer;
  transition: 180ms ease;
}

.view-note {
  flex: 0 0 auto;
  padding: 10px 14px;
  font-size: 0.84rem;
}

.view-note:hover,
.card-toggle:hover,
.carousel-button:hover {
  border-color: rgba(184, 121, 61, 0.42);
  color: #fff;
  background: var(--copper);
}

.keyboard-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.keyboard-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(54, 43, 31, 0.12);
  border-radius: 14px;
  background: rgba(255, 250, 241, 0.92);
  box-shadow: 0 18px 44px rgba(45, 36, 24, 0.1);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.keyboard-card:hover {
  border-color: rgba(184, 121, 61, 0.34);
  box-shadow: 0 24px 56px rgba(45, 36, 24, 0.16);
  transform: translateY(-3px);
}

.card-media {
  position: relative;
  display: grid;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  place-items: center;
  background:
    linear-gradient(135deg, rgba(51, 66, 38, 0.18), rgba(229, 213, 189, 0.38)),
    var(--panel-strong);
  color-scheme: only light;
  forced-color-adjust: none;
}

.card-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background-color: var(--panel-strong);
  color-scheme: only light;
  filter: none;
  forced-color-adjust: none;
}

.image-count {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 6px 9px;
  border-radius: 999px;
  color: #fffaf1;
  font-size: 0.72rem;
  background: rgba(36, 31, 26, 0.6);
}

.carousel-controls {
  position: absolute;
  right: 14px;
  bottom: 14px;
  display: flex;
  gap: 7px;
}

.carousel-button {
  display: grid;
  width: 36px;
  height: 36px;
  padding: 0;
  place-items: center;
  color: var(--cream);
  background: rgba(36, 31, 26, 0.58);
}

.carousel-button:disabled {
  cursor: default;
  opacity: 0.42;
}

.carousel-button:disabled:hover {
  border-color: var(--line);
  color: var(--cream);
  background: rgba(36, 31, 26, 0.58);
}

.carousel-button svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2.2;
}

.card-body {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
  padding: 22px;
}

.card-kicker {
  margin: 0 0 10px;
  color: var(--copper);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.card-body h3 {
  color: var(--ink);
  font-size: 1.45rem;
  line-height: 1.15;
}

.spec-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 16px 0;
}

.spec-list div {
  min-width: 0;
  padding: 9px 10px;
  border: 1px solid rgba(54, 43, 31, 0.1);
  border-radius: 7px;
  background: rgba(229, 213, 189, 0.24);
}

.spec-list dt {
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.spec-list dd {
  margin: 5px 0 0;
  color: var(--green);
  font-size: 0.88rem;
  font-weight: 700;
  line-height: 1.35;
}

.card-summary {
  display: -webkit-box;
  margin: 0;
  overflow: hidden;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.75;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.keyboard-card.expanded .card-summary {
  display: block;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 16px 0 0;
}

.tag-row span {
  padding: 5px 8px;
  border: 1px solid rgba(83, 98, 65, 0.18);
  border-radius: 999px;
  color: var(--green-soft);
  font-size: 0.72rem;
  background: rgba(83, 98, 65, 0.08);
}

.card-toggle {
  align-self: flex-start;
  margin-top: auto;
  padding: 8px 11px;
  font-size: 0.78rem;
}

@media (max-width: 1120px) {
  .keyboard-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, 560px);
  }

  .nav-shell {
    min-height: 58px;
  }

  .nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: 58px;
    right: 14px;
    left: 14px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 10px;
    border: 1px solid rgba(255, 245, 223, 0.18);
    border-radius: 8px;
    background: #27331f;
  }

  .main-nav.open {
    display: flex;
  }

  .nav-group {
    display: block;
  }

  .main-nav a,
  .submenu-toggle {
    display: block;
    width: 100%;
    padding: 10px;
    text-align: left;
  }

  .submenu {
    position: static;
    box-shadow: none;
  }

  .gear-hero {
    padding: 48px 0 34px;
  }

  .hero-layout {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  h1 {
    font-size: clamp(2.8rem, 16vw, 4.4rem);
  }

  .hero-stats {
    max-width: 420px;
  }

  .section-head {
    display: block;
  }

  .view-note {
    margin-top: 14px;
  }

  .keyboard-grid {
    grid-template-columns: 1fr;
  }

  .card-media {
    aspect-ratio: 1.2;
  }

  .card-body {
    padding: 18px;
  }

  .spec-list {
    grid-template-columns: 1fr;
  }
}