@charset "utf-8";

:root {
  color-scheme: light;
  --page: #f4f7f3;
  --surface: #ffffff;
  --surface-soft: #f7faf7;
  --ink: #182721;
  --muted: #58675f;
  --quiet: #66736d;
  --line: #dbe3dc;
  --line-strong: #c8d4cc;
  --accent: #0e7567;
  --accent-hover: #0b6258;
  --accent-soft: #e6f2ed;
  --warning-bg: #fff7e8;
  --warning-ink: #754a12;
  --danger: #9b3d38;
  --shadow: 0 16px 42px rgba(24, 39, 33, 0.065);
  --radius-large: 22px;
  --radius-medium: 14px;
  --radius-small: 10px;
  --content-width: 1120px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.58;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
a,
summary,
input[type="color"] {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

button:not(:disabled),
a,
summary,
input[type="color"] {
  cursor: pointer;
}

[hidden] {
  display: none !important;
}

.container {
  width: min(var(--content-width), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  z-index: 50;
  top: 12px;
  left: 12px;
  transform: translateY(-160%);
  padding: 10px 16px;
  border-radius: var(--radius-small);
  background: var(--ink);
  color: #fff;
  font-weight: 650;
  text-decoration: none;
}

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

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

.site-header {
  border-bottom: 1px solid var(--line);
}

.header-inner,
.header-actions,
.brand {
  display: flex;
  align-items: center;
}

.header-inner {
  min-height: 70px;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  gap: 10px;
  color: var(--ink);
  font-size: 1.25rem;
  font-weight: 760;
  letter-spacing: -0.045em;
  text-decoration: none;
}

.brand-mark {
  width: 33px;
  height: 33px;
  color: var(--accent);
}

.header-actions {
  gap: 24px;
}

.device-note,
.header-link,
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 560;
  text-decoration: none;
}

.device-note svg {
  width: 19px;
  height: 19px;
  color: var(--accent);
}

.header-link,
.footer-link {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 4px;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

.header-link:hover,
.footer-link:hover {
  color: var(--accent-hover);
  text-decoration-color: currentColor;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  align-items: end;
  gap: 48px;
  padding-top: 50px;
  padding-bottom: 38px;
}

.hero-copy {
  max-width: 700px;
}

.hero-kicker,
.section-kicker {
  margin: 0 0 11px;
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 690;
  letter-spacing: 0;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.8rem, 5vw, 4.1rem);
  font-weight: 760;
  letter-spacing: -0.065em;
  line-height: 1.04;
}

.section-intro h2 span {
  color: var(--accent);
}

.hero-description {
  max-width: 610px;
  margin: 17px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.62;
}

.hero-proof {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 0 4px 19px;
  border-left: 2px solid var(--accent);
}

.proof-symbol {
  display: grid;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  place-items: center;
  border-radius: 13px;
  background: var(--accent-soft);
  color: var(--accent);
}

.proof-symbol svg {
  width: 31px;
  height: 31px;
}

.hero-proof h2 {
  margin: 1px 0 4px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.hero-proof p {
  max-width: 270px;
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
  line-height: 1.55;
}

.tool-section {
  scroll-margin-top: 24px;
}

.tool-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.builder-pane {
  min-width: 0;
  padding: 31px 33px 34px;
}

.pane-heading,
.preview-heading,
.customization-heading,
.preview-meta,
.field-footnote {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.pane-heading {
  align-items: flex-start;
  margin-bottom: 23px;
}

.pane-heading h2,
.preview-heading h2 {
  margin: 0;
  font-size: 1.34rem;
  font-weight: 720;
  letter-spacing: -0.045em;
  line-height: 1.25;
}

.pane-heading p {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.text-button,
.inline-link {
  border: 0;
  background: none;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 650;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  transition: color 160ms ease, text-decoration-color 160ms ease;
}

.text-button {
  min-height: 40px;
  margin: -3px -6px 0 0;
  padding: 6px;
  white-space: nowrap;
}

.text-button:hover,
.inline-link:hover {
  color: var(--accent-hover);
  text-decoration-color: currentColor;
}

#qrForm {
  display: grid;
  gap: 20px;
}

.form-field {
  display: grid;
  min-width: 0;
  gap: 8px;
}

.form-field label,
.size-control > span,
.color-control > span {
  color: var(--ink);
  font-size: 0.91rem;
  font-weight: 650;
}

.optional {
  margin-left: 6px;
  color: var(--quiet);
  font-size: 0.79rem;
  font-weight: 500;
}

.form-field input,
.form-field select,
.form-field textarea,
.size-control select {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  padding: 10px 13px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-small);
  background: var(--surface);
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.45;
  transition: border-color 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}

.form-field input::placeholder,
.form-field textarea::placeholder {
  color: #82918b;
  opacity: 1;
}

.form-field input:hover,
.form-field select:hover,
.form-field textarea:hover,
.size-control select:hover {
  border-color: #8ba69b;
}

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus,
.size-control select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
  outline: none;
}

.form-field textarea {
  min-height: 130px;
  resize: vertical;
}

.input-group {
  display: grid;
  gap: 17px;
  margin: 0;
  padding: 0;
  border: 0;
}

.input-group legend {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  clip-path: inset(50%);
}

.field-footnote {
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 4px 12px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.inline-link {
  min-height: 30px;
  margin: -5px -4px -4px 0;
  padding: 3px 4px;
  white-space: nowrap;
}

.field-hint {
  margin: -1px 0 0;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.5;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.preview-pane {
  min-width: 0;
  padding: 31px 33px 32px;
  border-left: 1px solid var(--line);
  background: var(--surface-soft);
}

.preview-heading {
  min-height: 34px;
  margin-bottom: 18px;
}

.preview-heading h2 {
  font-size: 1.17rem;
}

.preview-indicator {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 0.78rem;
  white-space: nowrap;
}

.preview-indicator > span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.preview-board {
  display: grid;
  width: min(100%, 360px);
  aspect-ratio: 1;
  margin: 0 auto;
  padding: 22px;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #fff;
}

#qrCanvas {
  display: block;
  max-width: 100%;
  height: auto;
  image-rendering: pixelated;
}

.empty-preview {
  display: grid;
  max-width: 260px;
  justify-items: center;
  text-align: center;
}

.empty-mark {
  width: 78px;
  height: 78px;
  margin-bottom: 16px;
  color: #7ca99d;
}

.empty-preview p {
  margin: 0;
  color: #243f38;
  font-size: 1rem;
  font-weight: 680;
}

.empty-preview span {
  margin-top: 5px;
  color: #63786f;
  font-size: 0.87rem;
}

.preview-meta {
  align-items: flex-start;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.45;
}

.preview-meta p {
  min-height: 22px;
  margin: 0;
}

.preview-meta p[data-state="error"] {
  color: var(--danger);
}

.preview-meta p[data-state="success"] {
  color: var(--accent-hover);
}

#sizeReadout {
  flex: 0 0 auto;
  color: var(--quiet);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.contrast-warning {
  margin: 9px 0 0;
  padding: 9px 11px;
  border: 1px solid #ead7ae;
  border-radius: var(--radius-small);
  background: var(--warning-bg);
  color: var(--warning-ink);
  font-size: 0.82rem;
  line-height: 1.45;
}

.download-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
  margin-top: 17px;
}

.button {
  display: inline-flex;
  min-height: 47px;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 11px;
  font-size: 0.92rem;
  font-weight: 680;
  line-height: 1.2;
  text-align: center;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease, box-shadow 150ms ease;
}

.button-primary {
  background: var(--accent);
  color: #fff;
}

.button-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.button-secondary {
  border-color: var(--line-strong);
  background: var(--surface);
  color: var(--ink);
}

.button-secondary:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.button-quiet {
  grid-column: 1 / -1;
  border-color: transparent;
  background: transparent;
  color: var(--accent);
}

.button-quiet:hover:not(:disabled) {
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.customization {
  margin-top: 19px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.customization-heading {
  margin-bottom: 13px;
}

.customization-heading h3 {
  margin: 0;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.size-control {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 0.82rem;
}

.size-control > span {
  color: var(--muted);
  font-size: 0.82rem;
}

.size-control select {
  width: auto;
  min-height: 38px;
  padding: 6px 28px 6px 9px;
  border-radius: 9px;
  font-size: 0.84rem;
}

.color-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 11px;
}

.color-control {
  display: flex;
  min-width: 0;
  min-height: 46px;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 7px 9px 7px 11px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
}

.color-control > span {
  overflow: hidden;
  font-size: 0.79rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.color-control input[type="color"] {
  flex: 0 0 36px;
  width: 36px;
  height: 31px;
  padding: 2px;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--surface);
}

.preset-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.preset-row > span {
  margin-right: 2px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 620;
}

.preset-button {
  min-height: 32px;
  padding: 5px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  transition: background-color 150ms ease, border-color 150ms ease, color 150ms ease;
}

.preset-button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.preset-button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-hover);
  box-shadow: inset 0 0 0 1px var(--accent);
}

.sharing-note {
  margin: 18px 0 0;
  padding: 12px 13px;
  border-left: 2px solid var(--line-strong);
  color: var(--muted);
  font-size: 0.81rem;
  line-height: 1.55;
}

.sharing-note strong {
  color: var(--ink);
  font-weight: 680;
}

.features-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.28fr);
  gap: 58px;
  padding-top: 88px;
  padding-bottom: 82px;
}

.section-intro h2,
.faq-intro h2 {
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 2.45rem);
  font-weight: 730;
  letter-spacing: -0.06em;
  line-height: 1.12;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.feature-item {
  padding-top: 15px;
  border-top: 1px solid var(--line-strong);
}

.feature-icon {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  place-items: center;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
}

.feature-icon svg {
  width: 21px;
  height: 21px;
}

.feature-item h3 {
  margin: 0 0 7px;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.62;
}

.faq-section {
  display: grid;
  grid-template-columns: minmax(220px, 0.72fr) minmax(0, 1.28fr);
  gap: 58px;
  padding-top: 36px;
  padding-bottom: 80px;
  border-top: 1px solid var(--line);
}

.faq-intro h2 {
  font-size: 1.8rem;
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list details:first-child {
  border-top: 1px solid var(--line);
}

.faq-list summary {
  position: relative;
  min-height: 56px;
  padding: 16px 34px 15px 0;
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 640;
  line-height: 1.45;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  top: 14px;
  right: 2px;
  color: var(--accent);
  content: "+";
  font-size: 1.25rem;
  font-weight: 450;
}

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

.faq-list details p {
  max-width: 650px;
  margin: -3px 24px 17px 0;
  color: var(--muted);
  font-size: 0.89rem;
  line-height: 1.65;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.footer-inner {
  display: flex;
  min-height: 78px;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.footer-brand {
  gap: 8px;
  font-size: 1rem;
}

.footer-brand .brand-mark {
  width: 27px;
  height: 27px;
}

.footer-inner > p {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer-link {
  font-size: 0.85rem;
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(245px, 0.9fr);
    gap: 32px;
  }

  .builder-pane,
  .preview-pane {
    padding-right: 26px;
    padding-left: 26px;
  }

  .features-section,
  .faq-section {
    grid-template-columns: minmax(180px, 0.65fr) minmax(0, 1.35fr);
    gap: 36px;
  }

  .feature-list {
    gap: 13px;
  }
}

@media (max-width: 740px) {
  .container {
    width: min(var(--content-width), calc(100% - 36px));
  }

  .header-inner {
    min-height: 68px;
  }

  .header-actions {
    gap: 15px;
  }

  .device-note {
    font-size: 0.82rem;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 25px;
    padding-top: 48px;
    padding-bottom: 36px;
  }

  .hero-proof {
    max-width: 440px;
  }

  .hero-description {
    max-width: 580px;
  }

  .tool-shell {
    grid-template-columns: 1fr;
  }

  .builder-pane {
    padding: 28px 28px 31px;
  }

  .preview-pane {
    padding: 26px 28px 28px;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .preview-board {
    width: min(100%, 360px);
  }

  .features-section,
  .faq-section {
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .features-section {
    padding-top: 66px;
    padding-bottom: 62px;
  }

  .faq-section {
    padding-top: 30px;
    padding-bottom: 62px;
  }
}

@media (max-width: 520px) {
  .container {
    width: calc(100% - 32px);
  }

  .header-inner {
    min-height: 62px;
  }

  .brand {
    gap: 8px;
    font-size: 1.1rem;
  }

  .brand-mark {
    width: 29px;
    height: 29px;
  }

  .header-actions {
    gap: 12px;
  }

  .device-note {
    gap: 5px;
    font-size: 0.75rem;
  }

  .device-note svg {
    width: 17px;
    height: 17px;
  }

  .header-link {
    font-size: 0.8rem;
  }

  .hero {
    padding-top: 39px;
    padding-bottom: 29px;
  }

  .hero-kicker,
  .section-kicker {
    margin-bottom: 10px;
    font-size: 0.83rem;
  }

  .hero h1 {
    font-size: clamp(2.65rem, 12vw, 3.9rem);
  }

  .hero-description {
    margin-top: 16px;
    font-size: 1rem;
  }

  .hero-proof {
    gap: 12px;
    padding-left: 14px;
  }

  .proof-symbol {
    flex-basis: 36px;
    width: 36px;
    height: 36px;
    border-radius: 11px;
  }

  .proof-symbol svg {
    width: 27px;
    height: 27px;
  }

  .tool-section {
    width: 100%;
  }

  .tool-shell {
    border-right: 0;
    border-left: 0;
    border-radius: 0;
    box-shadow: none;
  }

  .builder-pane {
    padding: 25px 16px 27px;
  }

  .pane-heading h2 {
    font-size: 1.26rem;
  }

  .pane-heading p {
    max-width: 230px;
    font-size: 0.87rem;
  }

  .pane-heading {
    gap: 10px;
    margin-bottom: 22px;
  }

  .preview-pane {
    padding: 24px 16px 25px;
  }

  .preview-board {
    width: min(100%, 340px);
    padding: 16px;
    border-radius: 17px;
  }

  .preview-indicator {
    font-size: 0.72rem;
  }

  .preview-heading h2 {
    font-size: 1.08rem;
  }

  .download-actions {
    gap: 8px;
  }

  .button {
    min-height: 48px;
    padding-inline: 8px;
    font-size: 0.86rem;
  }

  .color-controls {
    gap: 8px;
  }

  .color-control {
    padding: 6px;
  }

  .color-control > span {
    font-size: 0.72rem;
  }

  .color-control input[type="color"] {
    flex-basis: 33px;
    width: 33px;
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: 17px;
  }

  .feature-list {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .feature-item {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    column-gap: 11px;
    padding-top: 15px;
  }

  .feature-icon {
    grid-row: span 2;
    margin: 0;
  }

  .feature-item h3 {
    align-self: center;
    margin: 1px 0 4px;
  }

  .feature-item p {
    grid-column: 2;
  }

  .footer-inner {
    min-height: 82px;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 7px 12px;
    padding-top: 14px;
    padding-bottom: 14px;
  }

  .footer-inner > p {
    order: 3;
    width: 100%;
    font-size: 0.8rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --page: #111b17;
    --surface: #17231d;
    --surface-soft: #1c2b24;
    --ink: #edf3ee;
    --muted: #b3c0b7;
    --quiet: #93a197;
    --line: #2f4036;
    --line-strong: #465b4e;
    --accent: #72c8b1;
    --accent-hover: #8ed9c6;
    --accent-soft: #203b31;
    --warning-bg: #392f1f;
    --warning-ink: #f2d69e;
    --danger: #ffaaa0;
    --shadow: 0 18px 54px rgba(0, 0, 0, 0.18);
  }

  .preview-board {
    border-color: #52645b;
    background: #fff;
  }

  .empty-mark {
    color: #81a99c;
  }

  .empty-preview p {
    color: #243f38;
  }

  .empty-preview span {
    color: #63786f;
  }

  .preview-meta p[data-state="success"] {
    color: #80d5c0;
  }

  .contrast-warning {
    border-color: #6b5733;
  }

  .color-control input[type="color"] {
    border-color: var(--line-strong);
    background: var(--surface);
  }

  .button-primary {
    color: #10241f;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}