/* IceSell introduction page: one stylesheet for /, /en/, /404.html and the thanks and oops pages.
   Brand rules: docs/brand/index.html (Ice Blue #0071e3, Trust Blue #0b57d0, Ice Frost #e8f0fe, Deep Ink #1f1f1f,
   canvas #f0f4f9). Light theme only. No fonts, images or scripts from other sites. */

:root {
  color-scheme: light;
  --blue: #0071e3;
  --blue-deep: #0b57d0;
  --frost: #e8f0fe;
  --ink: #1f1f1f;
  --ink-soft: #444746;
  --muted: #5f6368;
  --canvas: #f0f4f9;
  --white: #ffffff;
  --danger: #ba1a1a;
  --danger-soft: #fdecea;
  --field-border: #80868b;
  --line: rgba(15, 23, 42, 0.14);
  --line-soft: rgba(15, 23, 42, 0.08);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 18px 40px -18px rgba(15, 23, 42, 0.24);
  --gutter: 16px;
  --wrap: 1120px;
  --font-latin: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-zh: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font: var(--font-latin);
}

:root:lang(zh-Hans) {
  --font: var(--font-zh);
}

@media (min-width: 640px) {
  :root { --gutter: 24px; }
}

@media (min-width: 1024px) {
  :root { --gutter: 32px; }
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (min-width: 880px) {
  html { scroll-padding-top: 88px; }
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

:root:lang(zh-Hans) body { line-height: 1.8; }

h1, h2, h3, p, ul, ol, figure, dl, dd {
  margin: 0;
}

h1, h2, h3 {
  line-height: 1.28;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

/* Chinese headings break after a comma or a space, never inside a phrase. */
:root:lang(zh-Hans) :is(h1, h2, h3) {
  word-break: keep-all;
  overflow-wrap: anywhere;
}

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

a {
  color: var(--blue-deep);
  text-underline-offset: 0.2em;
}

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

.on-dark :focus-visible {
  outline-color: #ffffff;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: max(var(--gutter), env(safe-area-inset-left)) max(var(--gutter), env(safe-area-inset-right));
}

/* ---------- skip link and language bar ---------- */

.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 100;
  padding: 12px 18px;
  border-radius: 12px;
  background: var(--ink);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
}

.skip-link:focus {
  top: 12px;
  outline-color: #ffffff;
}

.langbar {
  background: var(--frost);
  color: var(--ink);
  font-size: 0.9375rem;
  line-height: 1.5;
}

.langbar .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 4px 16px;
  padding-block: 6px;
}

.langbar p {
  flex: 1 1 220px;
}

.langbar-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

.langbar-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--blue-deep);
  font-weight: 600;
  text-decoration: none;
}

.langbar-close {
  min-width: 44px;
  min-height: 44px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
}

/* ---------- header ---------- */

.site-header {
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid var(--line-soft);
}

.header-bar {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas: "brand tools" "nav nav";
  align-items: center;
  gap: 4px 12px;
  padding-block: 8px;
}

.brand {
  grid-area: brand;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.brand img {
  flex: none;
  max-width: none;
  height: 36px;
  width: auto;
}

.header-tools {
  grid-area: tools;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.header-tools .header-cta {
  display: none;
}

.nav {
  grid-area: nav;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 8px;
  padding-bottom: 6px;
}

.nav a {
  display: inline-flex;
  flex: 1 1 calc(33.333% - 6px);
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
  border-radius: 999px;
  background: var(--canvas);
  color: var(--ink);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.nav a:hover {
  background: var(--frost);
  color: var(--blue-deep);
}

.lang {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: #ffffff;
}

.lang a {
  display: inline-flex;
  flex: none;
  align-items: center;
  justify-content: center;
  min-width: 48px;
  min-height: 44px;
  padding: 0 10px;
  white-space: nowrap;
  color: var(--ink-soft);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
}

.lang a:hover {
  background: var(--frost);
}

.lang a[aria-current] {
  background: var(--ink);
  color: #ffffff;
}

@media (min-width: 640px) {
  .header-tools .header-cta { display: inline-flex; }
}

@media (min-width: 880px) {
  .site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.94);
    -webkit-backdrop-filter: saturate(1.4) blur(10px);
    backdrop-filter: saturate(1.4) blur(10px);
  }

  .header-bar {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas: "brand nav tools";
    gap: 24px;
    padding-block: 12px;
  }

  .brand img { height: 40px; }

  .nav {
    justify-content: center;
    gap: 2px;
    padding: 0;
  }

  .nav a {
    flex: 0 0 auto;
    background: transparent;
  }
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 24px;
  border: 1.5px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.15s, color 0.15s, border-color 0.15s;
}

.btn svg {
  width: 20px;
  height: 20px;
  flex: none;
}

.btn-primary {
  background: var(--blue);
  color: #ffffff;
}

.btn-primary:hover {
  background: var(--blue-deep);
}

.btn-secondary {
  background: #ffffff;
  border-color: var(--line);
  color: var(--blue-deep);
}

.btn-secondary:hover {
  background: var(--frost);
}

.btn-small {
  min-height: 44px;
  padding: 0 18px;
  font-size: 0.9375rem;
}

.btn[disabled] {
  opacity: 0.65;
  cursor: progress;
}

/* ---------- main layout ---------- */

main {
  display: flex;
  flex: 1 0 auto;
  flex-direction: column;
}

.page-top {
  display: flex;
  flex: 1 0 auto;
  flex-direction: column;
}

.section {
  padding-block: 56px;
}

.section-white {
  background: #ffffff;
  border-block: 1px solid var(--line-soft);
}

.section-head {
  max-width: 46rem;
  margin: 0 auto 36px;
  text-align: center;
}

.section-head h2,
.contact-copy h2 {
  font-size: clamp(1.5rem, 1.15rem + 1.5vw, 2.375rem);
  font-weight: 700;
}

.section-head p {
  margin-top: 12px;
  color: var(--ink-soft);
  font-size: 1.0625rem;
  text-wrap: balance;
}

@media (min-width: 880px) {
  .section { padding-block: 96px; }
  .section-head { margin-bottom: 48px; }
}

/* ---------- hero ---------- */

.hero {
  padding: 32px 0 56px;
  text-align: center;
}

.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--frost);
  color: var(--blue-deep);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.5;
}

.sent {
  display: inline-block;
}

.hero h1 {
  max-width: 19em;
  margin-inline: auto;
  font-size: clamp(1.75rem, 1.15rem + 2.9vw, 3.25rem);
  font-weight: 700;
}

.lead {
  max-width: 40em;
  margin: 16px auto 0;
  color: var(--ink-soft);
  font-size: 1.0625rem;
  text-wrap: balance;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.hero-actions .btn {
  flex: 1 1 220px;
  max-width: 340px;
}

@media (min-width: 640px) {
  .hero-actions .btn { flex: 0 0 auto; }
}

.chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 22px;
  margin: 24px auto 0;
  padding: 0;
  list-style: none;
  color: var(--ink-soft);
  font-size: 0.9375rem;
}

.chips li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.chips li::before {
  content: "";
  flex: none;
  width: 6px;
  height: 11px;
  margin-top: -3px;
  border: solid var(--blue-deep);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

.shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #ffffff;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.shot img {
  width: 100%;
  height: auto;
}

.hero-shot {
  max-width: 1080px;
  margin: 40px auto 0;
  text-align: left;
}

@media (min-width: 880px) {
  .hero { padding: 56px 0 96px; }
  .hero-shot { margin-top: 56px; border-radius: 20px; }
}

/* ---------- feature blocks ---------- */

.features {
  display: grid;
  gap: 56px;
}

.feature {
  display: grid;
  gap: 24px;
  align-items: center;
}

.feature-text h3 {
  font-size: clamp(1.3rem, 1.1rem + 0.9vw, 1.75rem);
  font-weight: 700;
}

.kicker {
  margin-bottom: 8px;
  color: var(--blue-deep);
  font-size: 0.875rem;
  font-weight: 700;
}

.feature-text > p {
  margin-top: 12px;
  color: var(--ink-soft);
}

.ticks {
  display: grid;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.ticks li {
  position: relative;
  padding-left: 28px;
}

.ticks li::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0.45em;
  width: 6px;
  height: 11px;
  border: solid var(--blue-deep);
  border-width: 0 2.5px 2.5px 0;
  transform: rotate(45deg);
}

:root:lang(zh-Hans) .ticks li::before {
  top: 0.6em;
}

.shot-narrow {
  max-width: 380px;
  margin-inline: auto;
}

.shot-cap {
  max-width: 500px;
  margin-inline: auto;
}

.shot-stack {
  display: grid;
  gap: 16px;
  max-width: 420px;
  margin-inline: auto;
}

.feature-media {
  width: 100%;
  max-width: 640px;
  margin-inline: auto;
}

@media (min-width: 880px) {
  .features { gap: 96px; }

  .feature {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 64px;
  }

  .feature:nth-child(even) {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .feature:nth-child(even) .feature-media { order: -1; }
}

/* ---------- how to start ---------- */

.steps {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}

.step {
  counter-increment: step;
  padding: 24px;
  border: 1px solid var(--line-soft);
  border-radius: 20px;
  background: #ffffff;
  box-shadow: var(--shadow);
}

.step::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 16px;
  border-radius: 50%;
  background: var(--blue);
  color: #ffffff;
  font-weight: 700;
}

.step h3 {
  font-size: 1.25rem;
}

.step p {
  margin-top: 8px;
  color: var(--ink-soft);
}

@media (min-width: 760px) {
  .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }
}

/* ---------- two ways and the data ---------- */

.ways {
  display: grid;
  gap: 16px;
}

.way {
  padding: 24px;
  border-radius: 20px;
  background: var(--canvas);
}

.way h3 {
  font-size: 1.25rem;
}

.way p {
  margin-top: 8px;
  color: var(--ink-soft);
}

.tag {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  border-radius: 999px;
  background: #ffffff;
  color: var(--blue-deep);
  font-size: 0.875rem;
  font-weight: 700;
  line-height: 1.5;
}

.safety-sub {
  margin: 48px 0 20px;
  font-size: 1.375rem;
  text-align: center;
}

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

.points li {
  padding: 18px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  background: #ffffff;
}

.points strong {
  display: block;
  margin-bottom: 4px;
}

.points span {
  color: var(--ink-soft);
}

.note {
  margin-top: 12px;
  padding: 18px 20px;
  border-radius: 16px;
  background: var(--frost);
}

.note strong {
  display: block;
  margin-bottom: 4px;
}

@media (min-width: 760px) {
  .ways {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .points {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .note { margin-top: 16px; }
}

/* ---------- FAQ ---------- */

.faq-section {
  padding-bottom: 104px;
}

.faq {
  display: grid;
  gap: 10px;
  max-width: 50rem;
  margin: 0 auto;
}

.faq details {
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  background: #ffffff;
}

.faq summary {
  position: relative;
  display: block;
  min-height: 56px;
  padding: 15px 56px 15px 20px;
  font-weight: 600;
  list-style: none;
  cursor: pointer;
}

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

.faq summary::after {
  content: "";
  position: absolute;
  right: 24px;
  top: 50%;
  width: 9px;
  height: 9px;
  border: solid var(--blue-deep);
  border-width: 0 2.5px 2.5px 0;
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.15s;
}

.faq details[open] summary::after {
  transform: translateY(-25%) rotate(-135deg);
}

.answer {
  padding: 0 20px 20px;
  color: var(--ink-soft);
}

.answer p + p {
  margin-top: 10px;
}

/* ---------- contact and the form ---------- */

.section-contact {
  padding-top: 24px;
  padding-bottom: 72px;
}

.contact-panel {
  display: grid;
  gap: 28px;
  padding: 28px 16px;
  border-radius: 28px;
  background: var(--blue-deep);
  color: #ffffff;
}

.contact-copy p {
  margin-top: 14px;
}

.mail-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 8px;
}

.mail-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #ffffff;
  font-size: 1.125rem;
  font-weight: 700;
  overflow-wrap: anywhere;
}

.form-card {
  padding: 20px 16px;
  border-radius: 20px;
  background: #ffffff;
  color: var(--ink);
  box-shadow: 0 24px 48px -24px rgba(0, 0, 0, 0.4);
}

.form {
  display: grid;
  gap: 16px;
}

.field {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.field label {
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.4;
}

.req {
  margin-left: 2px;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 500;
}

.field input,
.field textarea {
  display: block;
  width: 100%;
  min-height: 48px;
  padding: 11px 14px;
  border: 1.5px solid var(--field-border);
  border-radius: 12px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  line-height: 1.5;
}

.field textarea {
  min-height: 128px;
  resize: vertical;
}

.field input:focus-visible,
.field textarea:focus-visible {
  border-color: var(--blue-deep);
  outline-offset: 1px;
}

.field.is-invalid input,
.field.is-invalid textarea {
  border-color: var(--danger);
  box-shadow: 0 0 0 1px var(--danger);
}

.hint {
  align-self: end;
  color: var(--ink-soft);
  font-size: 0.875rem;
  line-height: 1.5;
}

.hint.is-error {
  color: var(--danger);
  font-weight: 600;
}

.hp {
  position: absolute;
  left: -10000px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-actions {
  display: grid;
  gap: 10px;
}

.form-note {
  color: var(--muted);
  font-size: 0.875rem;
}

.form-status:not(:empty) {
  padding: 12px 16px;
  border-left: 4px solid var(--danger);
  border-radius: 8px;
  background: var(--danger-soft);
  color: var(--ink);
  font-size: 0.9375rem;
  line-height: 1.6;
}

.form-status p + p {
  margin-top: 4px;
}

.form-status a {
  color: var(--blue-deep);
  font-weight: 600;
}

.form-done:not(:empty) {
  display: grid;
  gap: 8px;
  padding: 36px 16px;
  border-radius: 16px;
  background: var(--frost);
  font-size: 1.125rem;
  font-weight: 600;
  text-align: center;
}

@media (min-width: 640px) {
  .contact-panel { padding: 40px 32px; }
  .form-card { padding: 28px; }

  .form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 16px;
  }

  .field-wide,
  .form-actions { grid-column: 1 / -1; }

  .form-actions {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 10px 20px;
  }

  .form-status:not(:empty) { grid-column: 1 / -1; }
}

@media (min-width: 960px) {
  .contact-panel {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    padding: 56px;
    align-items: start;
  }
}

/* ---------- small pages: thanks, oops, 404 ---------- */

.notice {
  padding-block: 56px 96px;
}

.notice-card {
  max-width: 40rem;
  margin: 0 auto;
  padding: 32px 20px;
  border: 1px solid var(--line-soft);
  border-radius: 24px;
  background: #ffffff;
  box-shadow: var(--shadow);
  text-align: center;
}

.notice-card h1,
.notice-card h2 {
  font-size: clamp(1.5rem, 1.2rem + 1.4vw, 2.25rem);
}

.notice-card p {
  margin-top: 12px;
  color: var(--ink-soft);
}

.notice-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 24px;
}

.notice-two {
  display: grid;
  gap: 16px;
  max-width: 56rem;
  margin: 0 auto;
}

.notice-two .notice-card {
  max-width: none;
  margin: 0;
}

.notice-code {
  margin-bottom: 8px;
  color: var(--blue-deep);
  font-size: 0.875rem;
  font-weight: 700;
}

@media (min-width: 760px) {
  .notice-card { padding: 48px 40px; }
  .notice-two { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
}

/* ---------- footer ---------- */

.site-footer {
  background: var(--ink);
  color: #e8eaed;
}

.footer-inner {
  display: grid;
  gap: 24px;
  padding-block: 40px 44px;
}

.footer-brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
}

.footer-brand img {
  height: 40px;
  width: auto;
}

.footer-copy {
  margin-top: 14px;
  color: #c4c7c5;
}

.footer-mail {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: #ffffff;
  font-weight: 600;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0 4px;
}

.footer-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  color: #ffffff;
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

@media (min-width: 880px) {
  .footer-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

  .footer-side { text-align: right; }
  .footer-links { justify-content: flex-end; }
}

/* ---------- floating contact button ---------- */

/* The button sits at the end of the content above the contact section. It is pinned to the bottom of
   the screen while that content scrolls past and comes to rest above the contact section, so it never
   covers the form or the footer. */

.fab-rail {
  position: sticky;
  bottom: 0;
  z-index: 40;
  height: 0;
  margin-top: auto;
}

.chat-fab {
  position: absolute;
  right: max(16px, env(safe-area-inset-right));
  bottom: max(16px, env(safe-area-inset-bottom));
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-width: 56px;
  min-height: 56px;
  padding: 0;
  border-radius: 999px;
  background: var(--blue);
  box-shadow: 0 0 0 3px #ffffff, 0 10px 28px rgba(15, 23, 42, 0.38);
  color: #ffffff;
  font-weight: 700;
  text-decoration: none;
}

.chat-fab:hover {
  background: var(--blue-deep);
}

.chat-fab:focus-visible {
  outline: 3px solid #ffffff;
  outline-offset: 3px;
  box-shadow: 0 0 0 3px #ffffff, 0 0 0 6px var(--ink), 0 10px 28px rgba(15, 23, 42, 0.38);
}

.chat-fab svg {
  width: 26px;
  height: 26px;
}

.chat-fab-label {
  display: none;
}

@media (min-width: 640px) {
  .chat-fab {
    min-height: 52px;
    padding: 0 22px 0 18px;
  }

  .chat-fab svg { width: 22px; height: 22px; }
  .chat-fab-label { display: inline; }
}