:root {
  color-scheme: light;
  --bg: #ff8126;
  --ink: #151715;
  --accent: var(--ink);
  --accent-hover: #000000;
  --danger: #64120e;
  --muted: #565d59;
  --paper: #f5f5f2;
  --surface: #e8eae5;
  --white: #ffffff;
  --space: clamp(20px, 3vw, 48px);
  --body: clamp(16px, 1.25vw, 18px);
  --lead: clamp(22px, 2vw, 28px);
  --heading: clamp(36px, 5.5vw, 80px);
  --subheading: clamp(26px, 2.6vw, 38px);
  --display: clamp(48px, 6.4vw, 96px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}
* {
  box-sizing: border-box;
}
html {
  scroll-padding-top: 28px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font:
    var(--body)/1.6 "Segoe UI",
    "Microsoft YaHei",
    sans-serif;
  -webkit-tap-highlight-color: #15171526;
}
a {
  color: inherit;
  text-underline-offset: 0.22em;
}
a,
button,
input,
summary {
  touch-action: manipulation;
}
a,
button,
summary {
  transition: transform 160ms var(--ease);
}
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 5px;
}
.skip-link {
  position: absolute;
  z-index: 10;
  top: 12px;
  left: var(--space);
  padding: 12px 20px;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-160%);
}
.skip-link:focus {
  transform: none;
}
header {
  background: var(--bg);
  padding: 22px max(var(--space), env(safe-area-inset-right)) 22px
    max(var(--space), env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.wordmark {
  font-size: var(--lead);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: -0.04em;
}
header nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px 28px;
}
nav a {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}
.language-switch {
  justify-content: center;
  gap: 8px;
  min-width: 44px;
}
.language-switch svg {
  flex-shrink: 0;
}
.hero {
  background: var(--bg);
  min-height: calc(100svh - 89px);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 64px;
  padding: 38px max(var(--space), env(safe-area-inset-right)) 40px
    max(var(--space), env(safe-area-inset-left));
}
.hero h1 {
  font-size: clamp(32px, 9vw, 144px);
  line-height: 0.94;
  font-weight: 800;
  letter-spacing: -0.065em;
  margin: 0;
}
.hero-line {
  display: block;
  width: fit-content;
  max-width: 100%;
}
:lang(zh-CN) .hero h1 {
  font-size: clamp(36px, 12vw, 188px);
  line-height: 1.12;
  letter-spacing: -0.04em;
}
.hero-bottom {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 40px;
}
.hero-copy {
  min-width: 0;
}
.hero-actions {
  flex-shrink: 0;
  min-width: 260px;
}
h1,
h2,
h3 {
  text-wrap: balance;
}
h1 {
  font-size: var(--display);
  line-height: 1.02;
  margin: 0 0 32px;
  font-weight: 750;
  letter-spacing: -0.055em;
}
h2 {
  font-weight: 800;
  font-size: var(--heading);
  line-height: 1.1;
  letter-spacing: -0.04em;
  margin: 0 0 28px;
}
h3 {
  font-weight: 750;
  font-size: var(--subheading);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
}
p {
  margin: 0 0 24px;
  max-width: 65ch;
  text-wrap: pretty;
  overflow-wrap: break-word;
}
.hero-copy > p:first-child {
  font-size: var(--lead);
  line-height: 1.5;
  max-width: 48ch;
  margin-bottom: 22px;
}
.action,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  background: var(--accent);
  color: var(--white);
  padding: 14px 22px;
  text-decoration: none;
  border: 0;
  border-radius: 0;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.hero .action {
  width: 100%;
  min-height: 64px;
  justify-content: space-between;
  gap: 28px;
  background: var(--ink);
}
.hero .action > [aria-hidden] {
  font-size: 28px;
  line-height: 1;
}
.hero-guide-link {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  margin-top: 10px;
  min-height: 44px;
  text-decoration: none;
}
.note,
figcaption,
.field-hint,
.field-error,
.copy-message {
  font-size: 16px;
  line-height: 1.5;
}
.hero-note {
  margin: 0;
}
.reading,
.config-section {
  padding: 120px max(var(--space), env(safe-area-inset-right)) 120px
    max(var(--space), env(safe-area-inset-left));
}
.section-heading {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
  gap: 6vw;
  margin-bottom: 64px;
}
.section-heading > p {
  padding-top: 8px;
  font-size: clamp(18px, 1.5vw, 22px);
  margin-bottom: 0;
  max-width: 52ch;
}
.guide-layout {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 3fr);
  gap: 6vw;
  align-items: start;
}
.guide-contents {
  position: sticky;
  top: 28px;
}
.contents-disclosure {
  margin: 0;
  background: var(--bg);
  padding: 24px 16px;
}
.contents-disclosure > summary {
  padding-inline: 10px;
  font-size: var(--lead);
  font-weight: 800;
}
.contents-disclosure nav {
  display: flex;
  flex-direction: column;
  margin-top: 16px;
}
.contents-disclosure nav a {
  padding: 12px 10px;
  line-height: 1.35;
}
.contents-disclosure nav a[aria-current="location"] {
  background: var(--ink);
  color: var(--paper);
  font-weight: 600;
}
article {
  margin: 0 0 112px;
  scroll-margin-top: 28px;
}
article:last-child {
  margin-bottom: 0;
}
.answer {
  min-width: 0;
  max-width: 960px;
}
.guide-content {
  min-width: 0;
}
.answer > p,
.answer > ul {
  max-width: 65ch;
}
pre {
  background: var(--ink);
  color: var(--paper);
  color-scheme: dark;
  padding: 24px;
  overflow-x: auto;
  font-size: 16px;
  line-height: 1.6;
  max-width: 100%;
}
pre:focus-visible {
  outline-color: var(--bg);
}
pre code {
  overflow-wrap: normal;
}
code {
  overflow-wrap: anywhere;
}
figure {
  margin: 36px 0;
}
figure > a {
  display: block;
  overflow: hidden;
}
figure > a:focus-visible {
  outline-offset: 6px;
}
img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  background: var(--white);
}
figcaption {
  margin-top: 16px;
  max-width: 70ch;
}
ul,
ol {
  padding-left: 24px;
}
li {
  margin-bottom: 20px;
}
.config-section {
  background: var(--bg);
}
.config-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  align-items: start;
  gap: 8vw;
}
.config-layout .section-heading {
  display: block;
  margin: 0;
}
.config-layout .section-heading h2 {
  max-width: 11ch;
}
.config-layout .section-heading > p {
  max-width: 35ch;
}
.config-controls {
  min-width: 0;
}
form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}
.form-field {
  min-width: 0;
}
label {
  display: block;
  margin-bottom: 12px;
  font-size: 20px;
  font-weight: 750;
}
input {
  min-width: 0;
  width: 100%;
  min-height: 60px;
  padding: 16px;
  border: 2px solid var(--ink);
  background: var(--white);
  color: var(--ink);
  font: inherit;
  border-radius: 0;
}
select {
  width: 100%;
  min-height: 60px;
  padding: 16px;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--white);
  color: var(--ink);
  font: inherit;
}
.security-section {
  background: var(--surface);
}
.e2ee-figure {
  margin: 0 0 40px;
}
.e2ee-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 88px minmax(0, 1.12fr) 88px minmax(
      0,
      1fr
    );
  gap: 16px;
}
.e2ee-endpoint,
.e2ee-cloud {
  padding: 28px;
  min-width: 0;
}
.e2ee-endpoint {
  background: var(--paper);
}
.e2ee-endpoint > svg {
  width: 64px;
  height: 76px;
  margin: 24px 0 16px;
}
.e2ee-file-label {
  display: block;
  font-size: 20px;
}
.e2ee-endpoint > p:last-child,
.e2ee-cloud > p:last-child {
  margin-bottom: 0;
}
.e2ee-cloud {
  background: var(--bg);
}
.e2ee-cipher {
  font-size: var(--subheading);
  font-weight: 800;
  line-height: 1.1;
  margin: 32px 0;
}
.e2ee-keyless {
  font-weight: 700;
}
.e2ee-route {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 16px;
  font-size: 16px;
  text-align: center;
}
.e2ee-key-route {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 32px;
  padding: 28px;
  margin-top: 24px;
  background: var(--ink);
  color: var(--paper);
}
.e2ee-key-route > p {
  margin: 0;
}
.e2ee-key-route .flow-node-title {
  color: var(--bg);
}
.binding-screen,
.binding-phone {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 12px;
  min-width: 0;
}
.flow-node-title,
.password-flow h4 {
  display: block;
  font-size: var(--lead);
  line-height: 1.3;
}
.flow-node-title {
  margin: 0;
  font-weight: 700;
}
.binding-route {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.flow-arrow {
  display: block;
  width: 100%;
  height: 40px;
}
.security-truth {
  max-width: 84ch;
}
.password-explainer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: 4vw;
  margin: 72px 0 32px;
}
.password-explainer h3 {
  max-width: 13ch;
}
.password-flow {
  list-style-position: inside;
  padding: 0;
  margin: 0;
}
.password-flow li {
  margin: 0 0 28px;
}
.password-flow li::marker {
  font-weight: 700;
}
.password-flow h4 {
  display: inline;
  margin: 0;
}
.password-flow p {
  margin: 12px 0 0;
}
.security-sources {
  margin-bottom: 0;
}
.binding-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(100px, 0.7fr) minmax(0, 1fr);
  gap: 24px;
  align-items: center;
  padding: 32px;
  background: var(--surface);
}
.binding-screen > svg,
.binding-phone > svg {
  width: 140px;
  height: 112px;
  max-width: 100%;
  margin-bottom: 12px;
}
.binding-phone > svg {
  width: 80px;
}
.binding-recovery {
  display: flex;
  flex-direction: column;
  gap: 10px;
  grid-column: 1 / -1;
  padding: 24px;
  background: var(--ink);
  color: var(--paper);
}
.binding-recovery .flow-node-title {
  color: var(--bg);
}
@media (max-width: 1050px) {
  .e2ee-flow,
  .e2ee-key-route {
    grid-template-columns: minmax(0, 1fr);
  }
  .e2ee-route {
    align-items: center;
    gap: 8px;
    padding-block: 8px;
  }
  .e2ee-route .flow-arrow {
    width: 64px;
    transform: rotate(90deg);
    margin-block: 8px;
  }
  .e2ee-key-route {
    gap: 16px;
  }
}
@media (max-width: 600px) {
  .binding-map,
  .password-explainer {
    grid-template-columns: minmax(0, 1fr);
    gap: 24px;
  }
  .e2ee-endpoint,
  .e2ee-cloud,
  .e2ee-key-route,
  .binding-map {
    padding: 24px;
  }
  .binding-recovery {
    grid-column: 1;
  }
  .binding-route {
    gap: 8px;
  }
  .binding-route .flow-arrow {
    width: 60px;
    transform: rotate(90deg);
    margin-block: 8px;
  }
  .password-explainer {
    margin-top: 48px;
  }
  .password-explainer h3 {
    max-width: none;
    margin-bottom: 0;
  }
}
input::placeholder {
  color: var(--muted);
  opacity: 1;
}
input[aria-invalid="true"] {
  border-color: var(--danger);
}
.field-hint,
.field-error {
  margin: 10px 0 0;
}
.field-error {
  color: var(--danger);
  font-weight: 600;
}
form button {
  width: 100%;
  min-height: 64px;
  justify-self: stretch;
  grid-column: 1/-1;
}
#config-message {
  margin: 20px 0 0;
  font-size: 16px;
}
[hidden] {
  display: none !important;
}
#config-result {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-top: 64px;
  align-items: stretch;
}
.output-help {
  grid-column: 1/-1;
  font-size: 16px;
  margin: 0;
}
.output-block {
  min-width: 0;
  padding: 28px;
  background: var(--ink);
  color: var(--paper);
}
.output-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.output-block pre {
  margin: 28px 0 0;
  padding: 0 0 12px;
  height: 340px;
  overflow: auto;
}
.output-block h3 {
  font-size: var(--lead);
  margin-bottom: 0;
}
.output-block button {
  background: var(--bg);
  color: var(--ink);
}
.output-block :focus-visible {
  outline-color: var(--paper);
}
.output-destination {
  font-size: 16px;
  margin: 16px 0 0;
}
.output-block + p {
  grid-column: 1/-1;
  margin-bottom: 0;
}
.copy-message {
  margin: 16px 0 0;
}
.copy-message:empty {
  display: none;
}
.command-block {
  margin-block: 28px;
  padding: 24px;
  background: var(--ink);
  color: var(--paper);
  min-width: 0;
}
.command-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-weight: 600;
}
.command-block pre {
  margin: 20px 0 0;
  padding: 0 0 12px;
}
.command-block button {
  background: var(--bg);
  color: var(--ink);
}
.command-block :focus-visible {
  outline-color: var(--paper);
}
[data-copy] {
  min-width: 140px;
  gap: 8px;
}
[data-copy][data-copy-state="copied"] {
  background: var(--paper);
  color: var(--ink);
}
.verify {
  background: var(--ink);
  color: var(--paper);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6vw;
  align-items: start;
}
.verify h2 {
  color: var(--bg);
}
.verify :focus-visible {
  outline-color: var(--bg);
}
.verify a {
  color: var(--bg);
}
.verify-intro {
  position: sticky;
  top: 32px;
}
.verify .lead {
  font-size: var(--lead);
  line-height: 1.4;
  max-width: 32ch;
}
.verify ol {
  margin-top: 0;
  font-variant-numeric: tabular-nums;
  padding-left: 28px;
}
.verify li {
  padding-left: 12px;
  margin-bottom: 28px;
}
.verify li::marker {
  color: var(--bg);
  font-weight: 800;
}
.verify-checks {
  min-width: 0;
}
#faq {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr);
  gap: 6vw;
  align-items: start;
}
#faq > h2 {
  position: sticky;
  top: 32px;
}
.faq-list {
  min-width: 0;
}
details {
  margin: 0 0 12px;
  padding: 28px;
  background: var(--white);
}
summary {
  cursor: pointer;
  font-size: var(--body);
  font-weight: 700;
  min-height: 44px;
  align-content: center;
  overflow-wrap: anywhere;
}
details p {
  margin: 24px 0 0;
}
details[open]:not(.contents-disclosure) {
  background: var(--bg);
}
[id] {
  scroll-margin-top: 28px;
}
footer {
  padding: 64px max(var(--space), env(safe-area-inset-right)) 0
    max(var(--space), env(safe-area-inset-left));
  background: var(--ink);
  color: var(--paper);
  overflow: hidden;
}
footer > div {
  max-width: 65ch;
}
footer :focus-visible {
  outline-color: var(--white);
}
.footer-name {
  color: var(--bg);
  font-size: clamp(80px, 23vw, 320px);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.06em;
  margin: 56px 0 0;
}
.error-page {
  min-height: 100svh;
}
.error-page h1 {
  max-width: 12ch;
}
@media (hover: hover) and (pointer: fine) {
  a:hover {
    text-decoration: underline;
    text-decoration-thickness: 2px;
  }
  .action:hover,
  button:hover {
    background: var(--accent-hover);
    text-decoration: none;
  }
  .output-block button:hover {
    background: var(--white);
    color: var(--ink);
  }
  .command-block button:hover {
    background: var(--white);
    color: var(--ink);
  }
  summary:hover {
    text-decoration: underline;
    text-underline-offset: 0.22em;
  }
  .contents-disclosure nav a:hover {
    background: var(--ink);
    color: var(--paper);
  }
}
.action:active,
button:active {
  transform: scale(0.98);
}
button:disabled {
  cursor: progress;
}
@media (prefers-reduced-motion: no-preference) {
  .hero-line:first-child {
    transform: translate(
      calc(var(--hero-progress, 0) * clamp(24px, 8vw, 120px)),
      calc(var(--hero-progress, 0) * clamp(-88px, -6vw, -40px))
    );
  }
  .hero-line:last-child {
    transform: translate(
      calc(var(--hero-progress, 0) * clamp(-36px, -2.4vw, -12px)),
      calc(var(--hero-progress, 0) * clamp(16px, 2.5vw, 36px))
    );
  }
  .hero[data-scroll-motion] .hero-line {
    will-change: transform;
  }
  .is-entering {
    animation: guide-enter 650ms var(--ease) 70ms both;
  }
  .is-heading-entering {
    animation: guide-heading 700ms var(--ease) both;
  }
  .is-image-entering {
    animation: guide-image 1200ms var(--ease) both;
  }
}
@keyframes guide-enter {
  from {
    opacity: 0.45;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes guide-heading {
  from {
    opacity: 0.45;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes guide-image {
  from {
    transform: scale(1.025);
  }
  to {
    transform: scale(1);
  }
}
@media (pointer: fine) {
  html {
    overscroll-behavior: none;
  }
}
@media (min-width: 1001px) and (max-height: 680px) {
  .guide-contents {
    position: static;
  }
}
@media (max-width: 1000px) {
  .hero {
    padding-top: 48px;
    gap: 72px;
  }
  .hero-bottom {
    gap: 32px;
  }
  .hero-actions {
    min-width: 230px;
  }
  .hero-copy > p:first-child {
    max-width: 32ch;
  }
  .guide-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .guide-contents {
    position: static;
  }
  .contents-disclosure nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 16px;
  }
  .guide-content {
    max-width: 960px;
  }
  .section-heading {
    margin-bottom: 48px;
  }
  .reading,
  .config-section {
    padding-block: 88px;
  }
  .config-layout {
    gap: 5vw;
  }
}
@media (max-width: 600px) {
  header {
    position: relative;
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    padding-block: 16px;
  }
  header nav {
    gap: 4px 20px;
    justify-content: space-between;
    font-size: 16px;
  }
  .wordmark {
    justify-self: start;
  }
  .language-switch {
    position: absolute;
    top: 12px;
    right: max(var(--space), env(safe-area-inset-right));
    gap: 4px;
  }
  .language-switch svg {
    width: 18px;
    height: 18px;
  }
  .hero {
    min-height: calc(100svh - 119px);
    padding-top: 40px;
    padding-bottom: 28px;
    gap: 64px;
  }
  .hero-bottom {
    flex-direction: column;
    align-items: stretch;
    gap: 28px;
  }
  .hero-copy > p:first-child {
    font-size: 20px;
    max-width: 32ch;
    margin-bottom: 16px;
  }
  .hero-actions {
    min-width: 0;
  }
  .hero .action {
    min-height: 60px;
  }
  .hero-guide-link {
    margin-top: 4px;
  }
  .reading,
  .config-section {
    padding-block: 64px;
  }
  .section-heading,
  .config-layout,
  .verify,
  #faq {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .section-heading {
    margin-bottom: 36px;
  }
  .section-heading h2 {
    margin-bottom: 0;
  }
  .config-layout {
    gap: 36px;
  }
  .config-layout .section-heading h2 {
    max-width: none;
    margin-bottom: 20px;
  }
  .section-heading > p {
    padding-top: 0;
  }
  #config-result {
    margin-top: 40px;
  }
  .output-block {
    padding: 20px;
  }
  .output-heading {
    align-items: start;
    flex-direction: column;
    gap: 16px;
  }
  .guide-layout {
    gap: 36px;
  }
  .contents-disclosure nav {
    grid-template-columns: 1fr;
  }
  article {
    margin-bottom: 64px;
  }
  pre {
    padding: 16px;
  }
  figure {
    margin-block: 28px;
  }
  form,
  #config-result {
    grid-template-columns: 1fr;
  }
  .verify-intro,
  #faq > h2 {
    position: static;
  }
  .verify .lead {
    font-size: 22px;
    max-width: 35ch;
  }
  .verify-intro > p {
    margin-bottom: 0;
  }
  details {
    padding: 20px;
  }
  summary {
    min-height: 44px;
    align-content: center;
  }
  footer {
    padding-top: 48px;
    padding-bottom: env(safe-area-inset-bottom);
  }
}
@media (prefers-reduced-motion: reduce) {
  a,
  button,
  summary {
    transition: none;
  }
  .action:active,
  button:active {
    transform: none;
  }
}