/* ==========================================================================
   KeySound — Swiss Editorial & Tactile Hardware Design System
   Palette: Braun / Teenage Engineering inspired warm paper + crisp ink
   ========================================================================== */

:root {
  --paper: #F5F4F0;
  --paper-recessed: #EAE8E1;
  --paper-elevated: #FAF9F6;
  --ink: #141413;
  --ink-muted: rgba(20, 20, 19, 0.62);
  --ink-faint: rgba(20, 20, 19, 0.38);
  --hairline: rgba(20, 20, 19, 0.12);
  --hairline-strong: rgba(20, 20, 19, 0.24);
  --accent: #E84A27; /* International Orange */
  --accent-soft: rgba(232, 74, 39, 0.10);

  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --container-max: 1080px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.55;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--paper-recessed);
  padding: 0.1em 0.38em;
  border-radius: 3px;
  border: 1px solid var(--hairline);
}

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 28px;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(245, 244, 240, 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--hairline);
}

.header-inner {
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  display: block;
  filter: drop-shadow(0 1px 2px rgba(20, 20, 19, 0.16));
}

.brand-name {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.brand-tag {
  font-size: 0.6875rem;
  color: var(--ink-muted);
  padding-left: 10px;
  border-left: 1px solid var(--hairline);
}

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

.nav-link {
  font-size: 0.875rem;
  color: var(--ink-muted);
  transition: color 140ms ease;
}

.nav-link:hover {
  color: var(--ink);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: transform 120ms ease, background-color 140ms ease;
}

.btn-download:hover {
  background: #282826;
  transform: translateY(-1px);
}

.btn-download:active {
  transform: translateY(0);
}

.btn-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

.btn-ext {
  font-size: 0.6875rem;
  opacity: 0.65;
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding: 64px 0 72px;
  border-bottom: 1px solid var(--hairline);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 48px;
  align-items: end;
  margin-bottom: 52px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--ink-muted);
  margin-bottom: 20px;
}

.status-led {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.hero-title {
  margin: 0 0 18px;
  font-size: clamp(2.5rem, 5.2vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1.03;
}

.hero-lead {
  margin: 0 0 28px;
  max-width: 540px;
  font-size: 1.125rem;
  color: var(--ink-muted);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 20px;
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 13px 20px;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 500;
  transition: transform 120ms ease, background-color 140ms ease;
}

.btn-primary:hover {
  background: #282826;
  transform: translateY(-1px);
}

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

.btn-primary .mono {
  font-size: 0.75rem;
  padding: 2px 6px;
  border-radius: 3px;
  background: rgba(245, 244, 240, 0.14);
  color: var(--paper);
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.hero-meta .sep {
  color: var(--ink-faint);
}

/* Spec Card (Swiss hardware badge) */
.spec-card {
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  background: var(--paper-elevated);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.spec-card-top,
.spec-card-bottom {
  display: flex;
  justify-content: space-between;
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

.spec-card-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px 12px;
  background: var(--paper-recessed);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
}

.hero-logo-img {
  max-width: 196px;
  width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   Hardware-Inspired Keycap Tester
   ========================================================================== */

.tester-chassis {
  background: var(--paper-recessed);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  padding: 22px 24px 18px;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.7) inset,
    0 16px 36px -24px rgba(20, 20, 19, 0.25);
}

.chassis-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--hairline);
}

.chassis-title-group {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.chassis-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 2px rgba(232, 74, 39, 0.16);
  transition: transform 80ms ease, box-shadow 80ms ease;
}

.chassis-led.is-firing {
  transform: scale(1.25);
  box-shadow: 0 0 0 5px rgba(232, 74, 39, 0.28);
}

.chassis-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink);
}

.chassis-header-right {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.mode-switch {
  display: inline-flex;
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  padding: 2px;
  gap: 2px;
}

.mode-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-muted);
  font-size: 0.6875rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 3px;
  cursor: pointer;
  transition: background-color 120ms ease, color 120ms ease;
}

.mode-btn > *,
.switch-btn > *,
.preset-btn > *,
.keycap-top {
  pointer-events: none;
}

.mode-btn:hover {
  color: var(--ink);
}

.mode-btn.is-active {
  background: var(--ink);
  color: var(--paper-elevated);
}

.chassis-readout {
  font-size: 0.75rem;
  color: var(--ink-muted);
  background: var(--paper);
  border: 1px solid var(--hairline);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
}

.mode-panel.is-hidden {
  display: none;
}

/* 4-Position Switch Selector */
.switch-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 0;
}

.switch-bar-label {
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

.switch-selector {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 8px;
  flex: 1;
  max-width: 720px;
}

.switch-selector-5 {
  grid-template-columns: repeat(5, minmax(110px, 1fr));
  max-width: 820px;
}

/* Interactive Mini Sound Lab */
.lab-panel {
  padding: 16px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.preset-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: 8px;
  flex: 1;
  max-width: 820px;
}

.preset-btn {
  appearance: none;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 8px 11px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
  transition: border-color 120ms ease, background-color 120ms ease;
}

.preset-btn:hover {
  border-color: var(--hairline-strong);
}

.preset-btn.is-active {
  background: var(--paper-elevated);
  border-color: var(--ink);
  box-shadow: inset 0 2px 0 var(--accent);
}

.preset-tag {
  font-size: 0.625rem;
  color: var(--ink-faint);
}

.preset-btn.is-active .preset-tag {
  color: var(--accent);
  font-weight: 600;
}

.preset-name {
  font-size: 0.8125rem;
  font-weight: 600;
}

.lab-controls-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.lab-module {
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.lab-module-head,
.mod-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.mod-item-bottom {
  padding-top: 6px;
  border-top: 1px solid var(--hairline);
}

.lab-toggle {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
}

.lab-toggle input[type="checkbox"] {
  accent-color: var(--accent);
  width: 14px;
  height: 14px;
  margin: 0;
  cursor: pointer;
}

.lab-val {
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

.lab-sub {
  font-size: 0.625rem;
  color: var(--ink-faint);
}

.lab-row-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.mix-random-btn {
  appearance: none;
  background: var(--paper);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 120ms ease, color 120ms ease;
}

.mix-random-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.lab-select {
  width: 100%;
  background: var(--paper-recessed);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 5px 8px;
  font-size: 0.6875rem;
  color: var(--ink);
  cursor: pointer;
  outline: none;
}

.lab-select:focus {
  border-color: var(--accent);
}

.lab-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--paper-recessed);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.lab-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--ink);
  border: 1px solid var(--paper-elevated);
  cursor: pointer;
}

.lab-slider::-webkit-slider-thumb:hover {
  background: var(--accent);
}

.lab-slider::-moz-range-thumb {
  width: 12px;
  height: 12px;
  border-radius: 2px;
  background: var(--ink);
  border: 1px solid var(--paper-elevated);
  cursor: pointer;
}

.switch-btn {
  appearance: none;
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  background: var(--paper);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  color: var(--ink);
  transition: border-color 120ms ease, background-color 120ms ease, transform 80ms ease;
}

.switch-btn:hover {
  border-color: var(--hairline-strong);
}

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

.switch-btn.is-active {
  background: var(--paper-elevated);
  border-color: var(--ink);
  box-shadow: inset 0 2px 0 var(--accent);
}

.switch-pos {
  font-size: 0.625rem;
  color: var(--ink-faint);
}

.switch-btn.is-active .switch-pos {
  color: var(--accent);
  font-weight: 600;
}

.switch-name {
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.switch-spec {
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

/* Physical 60% Keybed & PBT Keycaps */
.keybed {
  background: #D4D1C7;
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-md);
  padding: 14px 16px 16px;
  box-shadow: inset 0 2px 6px rgba(20, 20, 19, 0.09);
  overflow-x: auto;
}

.keybed-hud {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  background: #1B1B19;
  color: #EAE8E1;
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  margin-bottom: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.72rem;
}

.keybed-stream {
  flex: 1 1 280px;
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.04em;
}

.keybed-placeholder {
  color: rgba(234, 232, 225, 0.5);
}

.keybed-cursor {
  display: inline-block;
  width: 7px;
  height: 1.05em;
  vertical-align: -2px;
  margin-left: 2px;
  background: var(--accent);
}

.keybed-stats {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: rgba(234, 232, 225, 0.72);
  flex-shrink: 0;
}

.keybed-stats .sep {
  opacity: 0.35;
}

.kb-60 {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 720px;
}

.kb-row {
  display: flex;
  align-items: stretch;
  gap: 6px;
}

.keycap {
  appearance: none;
  border: 0;
  padding: 0;
  flex: var(--u, 1) 1 0;
  min-width: 0;
  background: #C9C5BA;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  height: 52px;
  box-shadow:
    0 4px 0 #ABA69A,
    0 5px 8px rgba(20, 20, 19, 0.14),
    inset 0 0 0 1px rgba(20, 20, 19, 0.16);
  transition: transform 40ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 40ms cubic-bezier(0.2, 0.8, 0.2, 1);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.keycap-top {
  position: absolute;
  inset: 3px 4px 7px 4px;
  background: linear-gradient(180deg, #FAF9F5 0%, #EFECE5 100%);
  border-radius: 4px;
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: 0 1px 0 rgba(20, 20, 19, 0.06);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: flex-start;
  padding: 5px 7px;
  color: var(--ink);
  overflow: hidden;
}

.keycap--mod {
  background: #272725;
  box-shadow:
    0 4px 0 #141413,
    0 5px 8px rgba(20, 20, 19, 0.2),
    inset 0 0 0 1px rgba(255, 255, 255, 0.08);
}

.keycap--mod .keycap-top {
  background: linear-gradient(180deg, #3A3A36 0%, #2C2C29 100%);
  border-color: rgba(255, 255, 255, 0.12);
  color: #EAE8E1;
}

.keycap--accent {
  background: #C63B1D;
  box-shadow:
    0 4px 0 #9D2D15,
    0 5px 8px rgba(20, 20, 19, 0.18),
    inset 0 0 0 1px rgba(20, 20, 19, 0.16);
}

.keycap--accent .keycap-top {
  background: linear-gradient(180deg, #F36443 0%, var(--accent) 100%);
  border-color: rgba(255, 255, 255, 0.35);
  color: #FAF9F5;
}

.keycap--space .keycap-top {
  flex-direction: row;
  align-items: center;
  justify-content: space-between;
  padding: 5px 12px;
}

.key-legend {
  font-size: 0.72rem;
  font-weight: 600;
  line-height: 1;
}

.keycap--mod .key-legend {
  font-size: 0.625rem;
  letter-spacing: 0.03em;
}

.key-sub {
  font-size: 0.5625rem;
  opacity: 0.6;
  line-height: 1;
}

.keycap--accent .key-sub {
  opacity: 0.85;
}

.key-bump {
  align-self: center;
  width: 10px;
  height: 2px;
  border-radius: 1px;
  background: rgba(20, 20, 19, 0.32);
}

.keycap:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Depressed state */
.keycap.is-pressed,
.keycap:active {
  transform: translateY(3px);
  box-shadow:
    0 1px 0 #ABA69A,
    0 2px 3px rgba(20, 20, 19, 0.12),
    inset 0 0 0 1px rgba(20, 20, 19, 0.22);
}

.keycap--mod.is-pressed,
.keycap--mod:active {
  box-shadow:
    0 1px 0 #141413,
    0 2px 3px rgba(20, 20, 19, 0.18),
    inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.keycap--accent.is-pressed,
.keycap--accent:active {
  box-shadow:
    0 1px 0 #9D2D15,
    0 2px 3px rgba(20, 20, 19, 0.16),
    inset 0 0 0 1px rgba(20, 20, 19, 0.22);
}

.chassis-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding-top: 14px;
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   Specifications / Editorial Table
   ========================================================================== */

.specs-section {
  padding: 72px 0 84px;
}

.section-header {
  margin-bottom: 36px;
}

.section-index {
  display: block;
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 8px;
}

.section-title {
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 2.35rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.editorial-table {
  border-top: 1px solid var(--hairline-strong);
}

.spec-row {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 36px;
  padding: 36px 0;
  border-bottom: 1px solid var(--hairline);
}

.spec-row-index {
  font-size: 0.75rem;
  color: var(--ink-muted);
  padding-top: 5px;
}

.spec-row-main h3 {
  margin: 0 0 10px;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.spec-row-main > p {
  margin: 0 0 24px;
  max-width: 620px;
  color: var(--ink-muted);
  font-size: 0.975rem;
}

/* Switch Catalog List */
.switch-catalog {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--hairline);
  border-left: 1px solid var(--hairline);
}

.catalog-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-right: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  background: var(--paper-elevated);
}

.catalog-name {
  font-size: 0.9rem;
  font-weight: 500;
}

.catalog-variant {
  font-size: 0.7rem;
  color: var(--ink-muted);
}

/* Sound Lab Two-Tab Showcase & Flagship AI Sound Studio (Pro) */
.lab-tabs-grid {
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 16px;
  margin-bottom: 24px;
}

.lab-tab-card {
  background: var(--paper-elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.lab-tab-card--pro {
  border-color: var(--ink);
  box-shadow: inset 0 3px 0 var(--accent);
}

.lab-tab-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.pro-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--paper-elevated);
  background: var(--accent);
  padding: 2px 8px;
  border-radius: 3px;
}

.lab-tab-card h4 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.lab-tab-card > p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.55;
}

.lab-tab-list {
  margin: 4px 0 0;
  padding: 12px 0 0;
  border-top: 1px solid var(--hairline);
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--ink);
}

.lab-tab-list li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  line-height: 1.45;
}

.lab-tab-list li::before {
  content: "—";
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  flex-shrink: 0;
}

/* AI Sound Lab Cards */
.ai-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.ai-card {
  background: var(--paper-elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.ai-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.ai-badge {
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(232, 74, 39, 0.24);
  padding: 2px 7px;
  border-radius: 3px;
}

.ai-meta {
  font-size: 0.65rem;
  color: var(--ink-muted);
}

.ai-card h4 {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.ai-card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.55;
}

/* Sound Lab Key-Value List */
.feature-kv {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  border-top: 1px solid var(--hairline);
  padding-top: 20px;
}

.kv-item dt {
  font-size: 0.7rem;
  color: var(--ink-muted);
  margin-bottom: 6px;
}

.kv-item dd {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink);
  line-height: 1.5;
}

/* macOS Controls List */
.controls-list {
  border-top: 1px solid var(--hairline);
}

.control-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hairline);
}

.control-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.control-info strong {
  font-size: 0.9375rem;
  font-weight: 500;
}

.control-info span {
  font-size: 0.85rem;
  color: var(--ink-muted);
}

.kbd-group {
  display: inline-flex;
  gap: 6px;
}

.kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  padding: 4px 9px;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--paper-elevated);
  border: 1px solid var(--hairline-strong);
  border-bottom-width: 2px;
  border-radius: var(--radius-sm);
  color: var(--ink);
}

.pill {
  font-size: 0.6875rem;
  padding: 4px 9px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hairline-strong);
  color: var(--ink-muted);
  background: var(--paper-recessed);
}

/* ==========================================================================
   Pricing
   ========================================================================== */

.pricing-section {
  padding: 72px 0 84px;
  border-top: 1px solid var(--hairline);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  align-items: stretch;
}

.pricing-card {
  background: var(--paper-elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 24px 26px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.pricing-card--pro {
  border-color: var(--ink);
  box-shadow: inset 0 3px 0 var(--accent);
}

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

.pricing-term {
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

.pricing-price-row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.pricing-amount {
  font-size: clamp(2rem, 3.5vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--ink);
}

.pricing-cadence {
  font-size: 0.75rem;
  color: var(--ink-muted);
}

.pricing-list {
  margin: 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--hairline);
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--ink);
  flex: 1;
}

.pricing-list li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  line-height: 1.5;
}

.pricing-list li::before {
  content: "—";
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  flex-shrink: 0;
}

.pricing-foot {
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
}

.pricing-action {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--ink);
  border-bottom: 1px solid var(--hairline-strong);
  padding-bottom: 2px;
  transition: color 120ms ease, border-color 120ms ease;
}

.pricing-action:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.pricing-note {
  font-size: 0.72rem;
  color: var(--ink-muted);
}

.pricing-foot--actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.pricing-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn-checkout,
.btn-checkout-secondary {
  appearance: none;
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 120ms ease, border-color 120ms ease, color 120ms ease, transform 80ms ease;
}

.btn-checkout {
  background: var(--accent);
  color: var(--paper-elevated);
  border: 1px solid var(--accent);
}

.btn-checkout:hover:not(:disabled) {
  background: #d33d1b;
  border-color: #d33d1b;
}

.btn-checkout-secondary {
  background: var(--paper-recessed);
  color: var(--ink);
  border: 1px solid var(--hairline-strong);
}

.btn-checkout-secondary:hover:not(:disabled) {
  border-color: var(--ink);
}

.btn-checkout:disabled,
.btn-checkout-secondary:disabled {
  opacity: 0.65;
  cursor: wait;
}

.checkout-status {
  margin: 0;
  font-size: 0.72rem;
  color: var(--accent);
}

.checkout-banner {
  margin-top: 20px;
  padding: 16px 18px;
  border: 1px solid var(--accent);
  border-radius: var(--radius-md);
  background: var(--accent-soft);
}

.checkout-banner-head {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 6px;
}

.checkout-banner-copy {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink);
}

/* ==========================================================================
   AI Sound Studio Showcase
   ========================================================================== */

.ai-showcase-section {
  padding: 72px 0;
  border-top: 1px solid var(--hairline);
}

.section-lead {
  margin: 12px 0 0;
  max-width: 68ch;
  color: var(--ink-muted);
  font-size: 0.96rem;
}

.ai-explorer {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.35fr);
  gap: 20px;
  align-items: stretch;
}

.ai-prompt-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.ai-prompt-card {
  appearance: none;
  text-align: left;
  font-family: inherit;
  background: var(--paper-elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 120ms ease, background-color 120ms ease, transform 80ms ease;
}

.ai-prompt-card:hover {
  border-color: var(--hairline-strong);
}

.ai-prompt-card:active {
  transform: translateY(1px);
}

.ai-prompt-card.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.ai-prompt-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.ai-cat {
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--ink-muted);
}

.ai-play-hint {
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--accent);
}

.ai-prompt-title {
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.ai-prompt-desc {
  font-size: 0.78rem;
  color: var(--ink-muted);
  line-height: 1.4;
}

.ai-blueprint {
  background: var(--paper-recessed);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 18px;
}

.ai-blueprint-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hairline);
}

.ai-blueprint-kicker {
  display: block;
  font-size: 0.6875rem;
  color: var(--accent);
  margin-bottom: 4px;
}

.ai-blueprint-title {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.ai-audition-group {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ai-audition-btn {
  appearance: none;
  background: var(--paper-elevated);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-sm);
  padding: 6px 10px;
  font-size: 0.6875rem;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 100ms ease, background-color 100ms ease, color 100ms ease;
}

.ai-audition-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.ai-audition-btn.is-playing {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--paper-elevated);
}

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

.ai-role-item {
  background: var(--paper-elevated);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 12px 14px;
}

.ai-role-tag {
  display: inline-block;
  font-size: 0.625rem;
  font-weight: 600;
  color: var(--ink-muted);
  margin-bottom: 6px;
}

.ai-role-item p {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--ink);
  line-height: 1.45;
}

.ai-pillars {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
  font-size: 0.6875rem;
  color: var(--ink-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--hairline-strong);
  padding: 40px 0 56px;
  background: var(--paper-recessed);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr auto;
  gap: 32px;
  align-items: start;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.footer-brand img {
  display: block;
  filter: drop-shadow(0 1px 1.5px rgba(20, 20, 19, 0.14));
}

.footer-heading {
  font-size: 0.75rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.footer-note {
  margin: 0;
  font-size: 0.85rem;
  color: var(--ink-muted);
  line-height: 1.5;
}

.inline-link {
  color: var(--ink);
  border-bottom: 1px solid var(--hairline-strong);
  transition: border-color 120ms ease, color 120ms ease;
}

.inline-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.footer-col-right {
  display: flex;
  justify-content: flex-end;
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-mark {
    max-width: 320px;
  }

  .switch-selector,
  .switch-selector-5,
  .preset-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    max-width: none;
    width: 100%;
  }

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

  .ai-grid,
  .ai-explorer,
  .ai-prompt-list,
  .ai-roles-grid,
  .lab-tabs-grid,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

  .spec-row {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .feature-kv {
    grid-template-columns: 1fr;
  }

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

  .footer-col-right {
    justify-content: flex-start;
  }
}

@media (max-width: 560px) {
  .brand-tag,
  .nav-link {
    display: none;
  }

  .switch-catalog,
  .lab-controls-grid {
    grid-template-columns: 1fr;
  }
}