OSGKeyboard/docs/assets/site.css

:root {
  color-scheme: light dark;
  --canvas: #f5f6f3;
  --surface: #ffffff;
  --surface-subtle: #eceeea;
  --surface-inverse: #121412;
  --text: #171a17;
  --text-secondary: #606660;
  --text-tertiary: #898f8a;
  --stroke: rgba(23, 26, 23, 0.11);
  --stroke-strong: rgba(23, 26, 23, 0.18);
  --accent: #32794a;
  --accent-hover: #28643c;
  --accent-soft: rgba(50, 121, 74, 0.1);
  --on-accent: #ffffff;
  --inverse-text: #f4f6f4;
  --inverse-secondary: #aeb4af;
  --inverse-stroke: rgba(255, 255, 255, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --content: min(1120px, calc(100vw - 48px));
}

html[data-theme="dark"] {
  --canvas: #0d0f0e;
  --surface: #151816;
  --surface-subtle: #1c1f1d;
  --surface-inverse: #f1f3f1;
  --text: #f1f3f1;
  --text-secondary: #a6aca7;
  --text-tertiary: #777d78;
  --stroke: rgba(255, 255, 255, 0.1);
  --stroke-strong: rgba(255, 255, 255, 0.17);
  --accent: #73b889;
  --accent-hover: #88c79a;
  --accent-soft: rgba(115, 184, 137, 0.12);
  --on-accent: #102016;
  --inverse-text: #f4f6f4;
  --inverse-secondary: #aeb4af;
  --inverse-stroke: rgba(255, 255, 255, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 88px;
  background: var(--canvas);
}

body {
  margin: 0;
  overflow-x: hidden;
  background: var(--canvas);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

html[data-lang="en"] body {
  font-family: "Outfit", -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Helvetica Neue", Arial, sans-serif;
}

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
  font: inherit;
}

img {
  display: block;
  max-width: 100%;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1,
h2,
h3 {
  text-wrap: balance;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 14px;
  border-radius: 999px;
  background: var(--text);
  color: var(--canvas);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-nav {
  position: fixed;
  z-index: 50;
  top: 14px;
  right: 0;
  left: 0;
  width: var(--content);
  margin: auto;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 56px;
  padding: 7px 9px 7px 14px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: blur(22px) saturate(130%);
  -webkit-backdrop-filter: blur(22px) saturate(130%);
}

.brand {
  display: inline-flex;
  gap: 9px;
  align-items: center;
  font-size: 0.94rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.brand img {
  width: 30px;
  height: 30px;
  border-radius: 9px;
}

.nav-links,
.nav-actions {
  display: flex;
  align-items: center;
}

.nav-links {
  gap: clamp(16px, 2vw, 28px);
  color: var(--text-secondary);
  font-size: 0.86rem;
}

.nav-links a,
.footer-links a {
  transition: color 160ms ease;
}

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

.nav-actions {
  gap: 4px;
}

.icon-button.mobile-menu-button,
.mobile-nav {
  display: none;
}

.mobile-nav {
  gap: 4px;
  margin-top: 8px;
  padding: 8px;
  border: 1px solid var(--stroke);
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(22px) saturate(130%);
  -webkit-backdrop-filter: blur(22px) saturate(130%);
}

.mobile-nav a {
  padding: 11px 13px;
  border-radius: 11px;
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-weight: 650;
}

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

.icon-button,
.language-button {
  display: inline-grid;
  min-width: 40px;
  height: 40px;
  padding: 0 11px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  cursor: pointer;
  place-items: center;
}

.icon-button:hover,
.language-button:hover,
.icon-button:focus-visible,
.language-button:focus-visible {
  background: var(--surface-subtle);
}

.language-button {
  font-size: 0.78rem;
  font-weight: 700;
}

.material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 430, "GRAD" 0, "opsz" 24;
}

.hero {
  position: relative;
  min-height: 820px;
  padding: 152px 0 72px;
  overflow: hidden;
  background: #0b0d0c;
  color: var(--inverse-text);
}

.hero-beams,
.hero-scrim,
.hero-glow {
  position: absolute;
  inset: 0;
}

.hero-beams {
  opacity: 0.52;
}

.hero-beams canvas {
  width: 100%;
  height: 100%;
}

.hero-scrim {
  background: rgba(11, 13, 12, 0.38);
  pointer-events: none;
}

.hero-glow {
  display: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(430px, 0.95fr);
  gap: clamp(48px, 7vw, 88px);
  align-items: center;
  width: var(--content);
  margin: auto;
}

.eyebrow {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  margin: 0 0 17px;
  color: var(--text-secondary);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

html[data-lang="zh"] .eyebrow {
  letter-spacing: 0.06em;
  text-transform: none;
}

.hero .eyebrow {
  color: var(--inverse-secondary);
}

.eyebrow::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  content: "";
}

.hero h1 {
  max-width: 690px;
  margin-bottom: 24px;
  font-size: clamp(3.7rem, 6.8vw, 6.2rem);
  font-weight: 720;
  letter-spacing: -0.055em;
  line-height: 1;
}

html[data-lang="zh"] .hero h1 {
  font-size: clamp(3rem, 5vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.08;
}

.hero-accent {
  color: #d7ded9;
}

.hero-copy {
  max-width: 620px;
  margin-bottom: 28px;
  color: #b4bbb6;
  font-size: clamp(1.02rem, 1.4vw, 1.16rem);
  line-height: 1.75;
}

.hero-actions,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 11px;
  align-items: center;
}

.store-badge {
  display: inline-flex;
  transition: opacity 160ms ease, transform 160ms ease;
}

.store-badge img {
  width: auto;
  height: 46px;
}

.store-badge:hover,
.store-badge:focus-visible {
  opacity: 0.88;
  transform: translateY(-1px);
}

.secondary-button,
.primary-button {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.07);
  color: #f1f3f1;
  font-size: 0.88rem;
  font-weight: 650;
  backdrop-filter: blur(12px);
}

.primary-button {
  border-color: transparent;
  background: var(--accent);
  color: var(--on-accent);
}

.hero-note {
  margin: 15px 0 0;
  color: #828983;
  font-size: 0.78rem;
}

.hero-visual {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin-left: auto;
}

.illustration-label {
  margin-bottom: 10px;
  color: #858c86;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-align: right;
  text-transform: uppercase;
}

html[data-lang="zh"] .illustration-label {
  letter-spacing: 0.04em;
  text-transform: none;
}

.input-console {
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 26px;
  background: rgba(23, 26, 24, 0.88);
  backdrop-filter: blur(20px);
}

.console-toolbar {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  align-items: center;
  min-height: 58px;
  padding: 0 13px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.console-brand {
  display: grid;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  background: var(--accent);
  color: var(--on-accent);
  font-size: 0.67rem;
  font-weight: 800;
  place-items: center;
}

.mode-tabs {
  display: flex;
  gap: 4px;
  justify-content: center;
}

.mode-tab {
  padding: 6px 10px;
  border-radius: 999px;
  color: #858c86;
  font-size: 0.74rem;
  font-weight: 650;
}

.mode-tab.is-active {
  background: rgba(255, 255, 255, 0.09);
  color: #f1f3f1;
}

.console-menu {
  justify-self: end;
  color: #858c86;
}

.console-content {
  min-height: 350px;
  padding: clamp(26px, 5vw, 42px);
}

.console-kicker,
.visual-label {
  margin-bottom: 9px;
  color: #858c86;
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

html[data-lang="zh"] .console-kicker,
html[data-lang="zh"] .visual-label {
  letter-spacing: 0.04em;
  text-transform: none;
}

.console-transcript {
  max-width: 430px;
  margin-bottom: 30px;
  color: #f1f3f1;
  font-size: clamp(1.35rem, 2.6vw, 2rem);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.38;
}

.console-result {
  display: grid;
  gap: 7px;
  padding: 17px 18px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.045);
}

.result-label {
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
}

.result-copy {
  color: #b9c0ba;
  font-size: 0.92rem;
}

.console-footer {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 15px 22px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
}

.console-action,
.console-mic {
  display: grid;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.075);
  color: #aeb4af;
  place-items: center;
}

.console-action:last-child {
  justify-self: end;
}

.console-mic {
  width: 54px;
  height: 54px;
  background: var(--accent);
  color: var(--on-accent);
}

.hero-caption {
  display: flex;
  gap: 9px;
  justify-content: center;
  margin-top: 14px;
  color: #858c86;
  font-size: 0.75rem;
}

.trust-strip {
  position: relative;
  z-index: 3;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  width: var(--content);
  margin: 64px auto 0;
  border-top: 1px solid rgba(255, 255, 255, 0.11);
  border-bottom: 1px solid rgba(255, 255, 255, 0.11);
}

.trust-item {
  min-height: 92px;
  padding: 20px 22px;
  border-right: 1px solid rgba(255, 255, 255, 0.11);
}

.trust-item:last-child {
  border-right: 0;
}

.trust-item strong,
.trust-item span {
  display: block;
}

.trust-item strong {
  margin-bottom: 4px;
  color: #f0f2f0;
  font-size: 0.93rem;
}

.trust-item span {
  color: #858c86;
  font-size: 0.78rem;
}

.section {
  padding: clamp(76px, 9vw, 116px) 0;
}

.section-dark {
  background: #151715;
  color: var(--inverse-text);
}

html[data-theme="dark"] .section-dark {
  background: #111311;
}

.section-dark::before {
  display: none;
}

.section-inner {
  position: relative;
  width: var(--content);
  margin: auto;
}

.section-heading {
  max-width: 780px;
  margin-bottom: clamp(36px, 5vw, 58px);
}

.section-heading h2 {
  margin-bottom: 18px;
  font-size: clamp(2.4rem, 4.6vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.045em;
  line-height: 1.06;
}

html[data-lang="zh"] .section-heading h2 {
  font-size: clamp(2.1rem, 4vw, 3.25rem);
  letter-spacing: -0.025em;
  line-height: 1.12;
}

.section-heading p {
  max-width: 680px;
  margin-bottom: 0;
  color: var(--text-secondary);
  font-size: clamp(1rem, 1.4vw, 1.12rem);
  line-height: 1.75;
}

.section-dark .eyebrow,
.section-dark .section-heading p {
  color: var(--inverse-secondary);
}

.feature-stage {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(440px, 1.1fr);
  gap: clamp(44px, 7vw, 88px);
  align-items: start;
}

.feature-copy {
  padding-top: 12px;
}

.feature-copy h3 {
  margin-bottom: 16px;
  font-size: clamp(2rem, 3.4vw, 2.85rem);
  font-weight: 680;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

html[data-lang="zh"] .feature-copy h3 {
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  letter-spacing: -0.02em;
  line-height: 1.18;
}

.feature-copy > p {
  max-width: 590px;
  color: var(--text-secondary);
  font-size: 1.02rem;
  line-height: 1.75;
}

.section-dark .feature-copy > p {
  color: var(--inverse-secondary);
}

.feature-list {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.feature-list .material-symbols-rounded {
  margin-top: 2px;
  color: var(--text-tertiary);
  font-size: 19px;
}

.section-dark .feature-list .material-symbols-rounded {
  color: var(--inverse-secondary);
}

.workflow-visual {
  display: grid;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-xl);
  background: var(--surface);
  color: var(--text);
}

.workflow-step {
  display: grid;
  grid-template-columns: 42px 34px 1fr;
  gap: 15px;
  align-items: center;
  min-height: 128px;
  padding: 24px 28px;
  border-bottom: 1px solid var(--stroke);
}

.workflow-step:last-child {
  border-bottom: 0;
}

.workflow-number {
  color: var(--text-tertiary);
  font-size: 0.72rem;
  font-weight: 700;
}

.workflow-step > .material-symbols-rounded {
  color: var(--text-secondary);
}

.workflow-step strong,
.workflow-step small {
  grid-column: 3;
}

.workflow-step strong {
  align-self: end;
  font-size: 1.03rem;
}

.workflow-step small {
  align-self: start;
  color: var(--text-secondary);
  font-size: 0.86rem;
}

.feature-grid,
.path-grid,
.platform-grid,
.step-grid,
.compare-grid {
  display: grid;
  gap: 16px;
}

.feature-grid {
  grid-template-columns: repeat(12, 1fr);
}

.feature-card {
  display: flex;
  min-height: 260px;
  padding: clamp(24px, 3vw, 32px);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  background: var(--surface);
  flex-direction: column;
}

.feature-card:nth-child(1),
.feature-card:nth-child(4) {
  grid-column: span 7;
}

.feature-card:nth-child(2),
.feature-card:nth-child(3) {
  grid-column: span 5;
}

.feature-card::after {
  display: none;
}

.feature-card .icon {
  display: grid;
  width: 42px;
  height: 42px;
  margin-bottom: 32px;
  border-radius: 13px;
  background: var(--surface-subtle);
  color: var(--text-secondary);
  place-items: center;
}

.feature-card h3 {
  margin-bottom: 9px;
  font-size: clamp(1.3rem, 2vw, 1.72rem);
  font-weight: 680;
  letter-spacing: -0.025em;
}

.feature-card p {
  max-width: 540px;
  margin-bottom: 0;
  color: var(--text-secondary);
  line-height: 1.7;
}

.clipboard-visual,
.styles-visual {
  padding: clamp(24px, 4vw, 38px);
  border: 1px solid var(--inverse-stroke);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.045);
}

.clipboard-source {
  display: flex;
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--inverse-stroke);
  border-radius: 17px;
  background: rgba(255, 255, 255, 0.055);
}

.clipboard-source > .material-symbols-rounded {
  color: var(--inverse-secondary);
}

.clipboard-source small {
  color: var(--inverse-secondary);
}

.clipboard-source p {
  margin: 4px 0 0;
  color: var(--inverse-text);
  line-height: 1.55;
}

.clipboard-visual .visual-label {
  margin: 28px 0 12px;
  color: var(--inverse-secondary);
}

.skill-chip-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.skill-chip {
  display: flex;
  gap: 7px;
  align-items: center;
  min-height: 48px;
  padding: 0 12px;
  border: 1px solid var(--inverse-stroke);
  border-radius: 14px;
  color: var(--inverse-secondary);
  font-size: 0.82rem;
  font-weight: 650;
}

.skill-chip .material-symbols-rounded {
  font-size: 18px;
}

.skill-chip.is-primary {
  border-color: color-mix(in srgb, var(--accent) 48%, transparent);
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

.styles-visual {
  border-color: var(--stroke);
  background: var(--surface);
}

.style-selector {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 9px;
  margin-bottom: 22px;
}

.style-option {
  padding: 13px 14px;
  border: 1px solid var(--stroke);
  border-radius: 13px;
  color: var(--text-secondary);
  font-size: 0.84rem;
  font-weight: 650;
}

.style-option.is-selected {
  border-color: var(--accent);
  color: var(--text);
}

.style-preview {
  padding: 23px;
  border-radius: 17px;
  background: var(--surface-subtle);
}

.style-preview small {
  color: var(--text-tertiary);
}

.style-preview p {
  margin: 12px 0 22px;
  font-size: clamp(1.1rem, 2.2vw, 1.45rem);
  font-weight: 600;
  line-height: 1.55;
}

.preview-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preview-meta span {
  padding: 6px 9px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.72rem;
}

.path-grid {
  grid-template-columns: repeat(3, 1fr);
}

.path-card {
  padding: 27px;
  border: 1px solid var(--inverse-stroke);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.035);
}

.path-card.recommended {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  background: rgba(255, 255, 255, 0.035);
}

.path-index {
  display: block;
  margin-bottom: 42px;
  color: var(--inverse-secondary);
  font-size: 0.72rem;
  font-weight: 750;
}

.path-card h3 {
  margin-bottom: 11px;
  font-size: 1.55rem;
  font-weight: 680;
  letter-spacing: -0.025em;
}

.path-card p {
  color: var(--inverse-secondary);
}

.path-card ul {
  margin: 22px 0 0;
  padding-left: 18px;
  color: #d2d6d2;
}

.path-card li {
  margin-bottom: 8px;
}

.account-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(300px, 0.72fr);
  gap: clamp(48px, 8vw, 100px);
  align-items: start;
}

.account-phone {
  max-width: 380px;
  margin: auto;
  padding: 26px 18px;
  border: 1px solid var(--stroke);
  border-radius: 30px;
  background: var(--surface);
}

.credit-screen {
  padding: 4px 0 12px;
  color: var(--text);
}

.credit-screen h3 {
  margin-bottom: 30px;
  text-align: center;
  font-size: 1.08rem;
}

.credit-label {
  margin: 0 4px 8px;
  color: var(--text-tertiary);
  font-size: 0.72rem;
}

.balance-card,
.credit-pack-list {
  border: 1px solid var(--stroke);
  border-radius: 18px;
  background: var(--canvas);
}

.balance-card {
  margin-bottom: 20px;
  padding: 18px;
}

.balance-card strong {
  display: block;
  font-size: 2.25rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.045em;
}

.balance-card span {
  color: var(--text-secondary);
  font-size: 0.76rem;
}

.balance-bar {
  width: 68%;
  height: 5px;
  margin-top: 18px;
  border-radius: 999px;
  background: var(--accent);
}

.credit-pack {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 66px;
  padding: 0 15px;
  border-bottom: 1px solid var(--stroke);
}

.credit-pack:last-child {
  border-bottom: 0;
}

.credit-pack strong {
  font-size: 1.08rem;
  font-variant-numeric: tabular-nums;
}

.credit-pack .buy-chip {
  padding: 6px 10px;
  border: 1px solid var(--stroke-strong);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.78rem;
  font-weight: 650;
}

.privacy-panel {
  display: grid;
  grid-template-columns: minmax(250px, 0.75fr) minmax(0, 1.25fr);
  gap: clamp(40px, 7vw, 82px);
  align-items: start;
  padding: clamp(30px, 5vw, 56px);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-xl);
  background: var(--surface);
}

.privacy-mark {
  display: grid;
  width: 54px;
  height: 54px;
  margin-bottom: 24px;
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent);
  place-items: center;
}

.privacy-mark span {
  font-size: 28px;
}

.privacy-panel h2 {
  margin-bottom: 14px;
  font-size: clamp(2rem, 3.5vw, 3.1rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1.08;
}

html[data-lang="zh"] .privacy-panel h2 {
  font-size: clamp(1.9rem, 3vw, 2.65rem);
  letter-spacing: -0.02em;
  line-height: 1.15;
}

.privacy-panel p {
  color: var(--text-secondary);
}

.privacy-points {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--stroke);
  border-left: 1px solid var(--stroke);
}

.privacy-point {
  min-height: 132px;
  padding: 20px;
  border-right: 1px solid var(--stroke);
  border-bottom: 1px solid var(--stroke);
}

.privacy-point strong {
  display: block;
  margin-bottom: 5px;
}

.privacy-point span {
  color: var(--text-secondary);
  font-size: 0.85rem;
  line-height: 1.55;
}

.text-link {
  display: inline-flex;
  gap: 6px;
  align-items: center;
  margin-top: 13px;
  color: var(--accent);
  font-weight: 680;
}

.platform-grid {
  grid-template-columns: repeat(2, 1fr);
}

.platform-card {
  display: flex;
  min-height: 420px;
  padding: clamp(28px, 4vw, 42px);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-xl);
  background: var(--surface);
  flex-direction: column;
}

.platform-card h3 {
  margin: 22px 0 10px;
  font-size: 1.8rem;
  font-weight: 680;
  letter-spacing: -0.03em;
}

.platform-card > p {
  color: var(--text-secondary);
  line-height: 1.7;
}

.platform-pill {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  align-self: flex-start;
  padding: 7px 10px;
  border: 1px solid var(--stroke);
  border-radius: 999px;
  color: var(--text-secondary);
  font-size: 0.74rem;
  font-weight: 700;
}

.platform-specs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: auto;
  padding-top: 30px;
  border-top: 1px solid var(--stroke);
}

.platform-specs span {
  min-height: 52px;
  padding: 12px 12px 12px 0;
  border-bottom: 1px solid var(--stroke);
  color: var(--text-secondary);
  font-size: 0.82rem;
}

.platform-specs span:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.step-grid {
  grid-template-columns: repeat(3, 1fr);
  counter-reset: steps;
}

.step {
  min-height: 240px;
  padding: 25px 25px 25px 0;
  border-top: 1px solid var(--stroke-strong);
  counter-increment: steps;
}

.step::before {
  display: block;
  margin-bottom: 44px;
  color: var(--text-tertiary);
  content: "0" counter(steps);
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.08em;
}

.step h3 {
  margin-bottom: 9px;
  font-size: 1.35rem;
  font-weight: 680;
  letter-spacing: -0.02em;
}

.step p {
  color: var(--text-secondary);
}

.compare-grid {
  grid-template-columns: repeat(3, 1fr);
}

.compare-cell {
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 4px 12px;
  min-height: 132px;
  padding: 22px;
  border: 1px solid var(--inverse-stroke);
  border-radius: 17px;
  background: rgba(255, 255, 255, 0.035);
}

.compare-cell .material-symbols-rounded {
  grid-row: span 2;
  color: var(--inverse-secondary);
}

.compare-cell strong,
.compare-cell span {
  display: block;
}

.compare-cell strong {
  align-self: end;
  font-size: 0.92rem;
}

.compare-cell > span:last-child {
  color: var(--inverse-secondary);
  font-size: 0.78rem;
  line-height: 1.45;
}

.faq-list {
  max-width: 900px;
  border-top: 1px solid var(--stroke);
}

.faq-item {
  border-bottom: 1px solid var(--stroke);
}

.faq-item summary {
  display: flex;
  gap: 20px;
  align-items: center;
  justify-content: space-between;
  padding: 23px 0;
  cursor: pointer;
  font-size: clamp(1.02rem, 1.7vw, 1.2rem);
  font-weight: 650;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  color: var(--text-tertiary);
  content: "+";
  font-size: 1.35rem;
  font-weight: 400;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  max-width: 760px;
  padding: 0 0 23px;
  color: var(--text-secondary);
}

.download-panel {
  padding: clamp(38px, 7vw, 72px);
  border-radius: var(--radius-xl);
  background: #151715;
  color: #f2f4f2;
}

.download-panel::after {
  display: none;
}

.download-panel .eyebrow {
  color: #9ea49f;
}

.download-panel h2 {
  max-width: 760px;
  margin-bottom: 16px;
  font-size: clamp(2.7rem, 5vw, 4.7rem);
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 1;
}

html[data-lang="zh"] .download-panel h2 {
  font-size: clamp(2.2rem, 4vw, 3.5rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
}

.download-panel > p {
  max-width: 640px;
  margin-bottom: 27px;
  color: #aeb4af;
}

.site-footer {
  padding: 38px 0 48px;
}

.footer-inner {
  display: flex;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
  width: var(--content);
  margin: auto;
  color: var(--text-secondary);
  font-size: 0.8rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

@media (max-width: 1080px) {
  .nav-links {
    gap: 15px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 0.9fr) minmax(400px, 1.1fr);
    gap: 42px;
  }

  .compare-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 920px) {
  :root {
    --content: min(100% - 36px, 1120px);
  }

  .nav-links {
    display: none;
  }

  .icon-button.mobile-menu-button {
    display: inline-grid;
  }

  .mobile-nav:not([hidden]) {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-bottom: 58px;
  }

  .hero-inner,
  .feature-stage,
  .account-stage,
  .privacy-panel {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    max-width: 620px;
    margin: 14px 0 0;
  }

  .trust-strip {
    grid-template-columns: repeat(2, 1fr);
  }

  .trust-item:nth-child(2) {
    border-right: 0;
  }

  .trust-item:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.11);
  }

  .feature-stage {
    gap: 36px;
  }

  .feature-copy {
    padding-top: 0;
  }

  .path-grid,
  .step-grid {
    grid-template-columns: 1fr;
  }

  .path-card {
    min-height: auto;
  }

  .path-index {
    margin-bottom: 28px;
  }

  .step {
    min-height: auto;
    padding-right: 0;
  }
}

@media (max-width: 680px) {
  :root {
    --content: min(100% - 28px, 1120px);
    --radius-xl: 23px;
    --radius-lg: 19px;
  }

  .site-nav {
    top: 8px;
  }

  .nav-shell {
    min-height: 51px;
    padding: 5px 6px 5px 11px;
  }

  .brand span {
    display: none;
  }

  .mobile-nav:not([hidden]) {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
  }

  .mobile-nav a {
    padding: 10px 4px;
    font-size: 0.76rem;
    text-align: center;
  }

  .hero {
    padding-top: 112px;
  }

  .hero h1,
  html[data-lang="zh"] .hero h1 {
    font-size: clamp(2.75rem, 13vw, 3.6rem);
  }

  .hero-copy {
    font-size: 1rem;
  }

  .store-badge img {
    height: 44px;
  }

  .console-content {
    min-height: 310px;
    padding: 24px 20px;
  }

  .console-transcript {
    font-size: 1.35rem;
  }

  .hero-caption {
    gap: 6px;
    font-size: 0.7rem;
  }

  .trust-strip,
  .feature-grid,
  .privacy-points,
  .platform-grid,
  .compare-grid {
    grid-template-columns: 1fr;
  }

  .trust-item {
    min-height: 78px;
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.11);
  }

  .trust-item:last-child {
    border-bottom: 0;
  }

  .feature-card:nth-child(n) {
    grid-column: span 1;
  }

  .feature-card {
    min-height: auto;
  }

  .workflow-step {
    grid-template-columns: 32px 28px 1fr;
    min-height: 112px;
    padding: 20px;
  }

  .skill-chip-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .style-selector,
  .platform-specs {
    grid-template-columns: 1fr;
  }

  .platform-card {
    min-height: 380px;
  }

  .platform-specs span:nth-last-child(-n + 2) {
    border-bottom: 1px solid var(--stroke);
  }

  .platform-specs span:last-child {
    border-bottom: 0;
  }

  .privacy-point {
    min-height: auto;
  }

  .account-phone {
    width: 100%;
  }

  .download-panel {
    padding: 34px 24px;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}