:root {
  color-scheme: dark;
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  --page: #111827;
  --panel: #1f2937;
  --surface: #273449;
  --surface-soft: #202b3d;
  --surface-raised: #2d3b51;
  --border: #3b4a60;
  --text: #f3f6fb;
  --muted: #a4b0c1;
  --green: #0c9b72;
  --green-hover: #10b981;
  --green-soft: #133e39;
  --success: #76ddba;
  --focus: #6ee7c0;
  --danger: #fca5a5;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  padding: 38px 24px 56px;
  background:
    radial-gradient(ellipse at 50% -30%, #26364a 0, transparent 56%),
    var(--page);
  color: var(--text);
}

button,
textarea {
  font: inherit;
}

button {
  color: inherit;
}

.app {
  width: min(100%, 960px);
  margin: 0 auto;
  padding: 28px 30px 32px;
  border: 1px solid #293549;
  border-radius: 20px;
  background: rgba(31, 41, 55, 0.96);
  box-shadow: 0 24px 80px #080d1780;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 16px;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: block;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
}

.header-controls {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 9px;
}

.header-menu {
  position: relative;
}

.header-control {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 11px;
  border: 0;
  border-radius: 9px;
  background: transparent;
  color: var(--green-hover);
  cursor: pointer;
  font-size: 13px;
  font-weight: 650;
  white-space: nowrap;
}

.header-control:hover:not(:disabled),
.header-control[aria-expanded="true"] {
  background: var(--surface);
}

.header-control:focus-visible,
.menu-option:focus-visible,
.dialog-close:focus-visible {
  outline: 2px solid #6ee7c0;
  outline-offset: 3px;
}

.header-control .chevron {
  width: 13px;
  height: 13px;
  transition: transform 140ms ease;
}

.header-control[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.header-control.help-control svg {
  width: 19px;
  height: 19px;
  flex: 0 0 auto;
}

.header-control.help-control {
  padding: 0 14px;
  background: var(--green);
  color: white;
}

.header-control.help-control:hover {
  background: var(--green-hover);
}

.menu-options {
  position: absolute;
  z-index: 5;
  top: calc(100% + 8px);
  right: 0;
  min-width: 178px;
  padding: 5px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
  box-shadow: 0 14px 35px #080d1780;
}

.menu-options[hidden] {
  display: none;
}

.menu-option {
  display: flex;
  width: 100%;
  min-height: 38px;
  align-items: center;
  justify-content: space-between;
  padding: 0 10px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  text-align: left;
}

.menu-option:hover,
.menu-option[aria-checked="true"] {
  background: var(--surface);
}

.menu-option[aria-checked="true"]::after {
  color: var(--green-hover);
  content: "✓";
}

.help-dialog {
  width: min(520px, calc(100vw - 32px));
  max-height: min(80vh, 650px);
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 24px 80px #080d17b3;
  opacity: 0;
  transform: translateY(10px) scale(0.985);
  transition:
    opacity 200ms ease,
    transform 200ms ease,
    overlay 200ms allow-discrete,
    display 200ms allow-discrete;
}

.help-dialog[open] {
  opacity: 1;
  transform: translateY(0) scale(1);
}

@starting-style {
  .help-dialog[open] {
    opacity: 0;
    transform: translateY(10px) scale(0.985);
  }
}

.help-dialog::backdrop {
  background: rgb(8 13 23 / 0%);
  backdrop-filter: blur(3px);
  transition: background 200ms ease;
}

.help-dialog[open]::backdrop {
  background: rgb(8 13 23 / 70%);
}

@starting-style {
  .help-dialog[open]::backdrop {
    background: rgb(8 13 23 / 0%);
  }
}

.dialog-content {
  max-height: min(80vh, 650px);
  overflow: auto;
  padding: 24px;
}

.dialog-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 15px;
}

.dialog-head h2 {
  margin: 0;
  font-size: 20px;
}

.dialog-close {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  flex: 0 0 auto;
  border: 1px solid var(--border);
  border-radius: 11px;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
  font-size: 23px;
  line-height: 1;
  transition:
    background 150ms ease,
    border-color 150ms ease,
    color 150ms ease,
    box-shadow 150ms ease,
    transform 150ms ease;
}

.dialog-close:hover {
  transform: rotate(4deg);
  border-color: #ef6a6a;
  background: #dc3e46;
  color: #ffffff;
  box-shadow: 0 5px 16px rgb(220 62 70 / 28%);
}

.dialog-close:active {
  transform: scale(0.94);
}

.dialog-content p,
.dialog-content li {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.dialog-content ol {
  display: grid;
  gap: 7px;
  padding-left: 21px;
}

.help-content {
  display: grid;
  gap: 15px;
}

.help-content section + section {
  padding-top: 13px;
  border-top: 1px solid var(--border);
}

.help-content h3 {
  margin: 0 0 7px;
  color: var(--text);
  font-size: 14px;
}

.help-content p {
  margin: 0;
}

.help-content ol {
  margin: 0;
}

[data-theme="light"] {
  color-scheme: light;
  --page: #f4f7f5;
  --panel: #ffffff;
  --surface: #f1f5f3;
  --surface-soft: #f7faf8;
  --surface-raised: #e8efeb;
  --border: #d6e0da;
  --text: #172b24;
  --muted: #52665c;
  --green: #087c5d;
  --green-hover: #066248;
  --green-soft: #e2f2eb;
  --success: #08704f;
  --focus: #087c5d;
  --danger: #b42318;
}

body[data-theme="light"] {
  background: radial-gradient(ellipse at 50% -30%, #e4eee8 0, transparent 56%), var(--page);
}

[data-theme="light"] .app {
  border-color: #e0e8e3;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 24px 80px #27453614;
}

[data-theme="light"] .flow span {
  border-color: var(--border);
  background: #f5f8f6;
  color: var(--text);
}

[data-theme="light"] .direction-card,
[data-theme="light"] .upload-zone,
[data-theme="light"] .text-card,
[data-theme="light"] .footer,
[data-theme="light"] .result-card,
[data-theme="light"] .dialog-close {
  border-color: var(--border);
  background: #f7faf8;
}

[data-theme="light"] .result-preview,
[data-theme="light"] .direction-field select,
[data-theme="light"] .text-field textarea {
  border-color: var(--border);
  background: #ffffff;
  color: var(--text);
}

[data-theme="light"] .direction-field label,
[data-theme="light"] .text-field label,
[data-theme="light"] .footer strong {
  color: #2f493c;
}

[data-theme="light"] .text-field textarea[readonly] {
  color: var(--text);
}

[data-theme="light"] .text-field textarea::placeholder {
  color: #667a70;
}

body[data-theme="light"] .upload-zone {
  border-color: #9aafa3;
  background: #f7faf8;
}

[data-theme="light"] .upload-zone.is-dragging {
  border-color: var(--green);
  background: #edf7f1;
}

[data-theme="light"] .upload-icon {
  border-color: #bfdfce;
  color: #08704f;
}

[data-theme="light"] .flow b,
[data-theme="light"] .direction-arrow,
[data-theme="light"] .swap,
[data-theme="light"] .footer-mark {
  color: var(--green);
}

[data-theme="light"] .status {
  color: var(--success);
}

[data-theme="light"] .status.is-error {
  color: var(--danger);
}

[data-theme="light"] .button:focus-visible,
[data-theme="light"] .file-picker:focus-visible + .button,
[data-theme="light"] textarea:focus-visible,
[data-theme="light"] .header-control:focus-visible,
[data-theme="light"] .menu-option:focus-visible,
[data-theme="light"] .dialog-close:focus-visible,
[data-theme="light"] .direction-field select:focus-visible {
  outline-color: var(--focus);
}

[data-theme="light"] .menu-options {
  border-color: var(--border);
  background: #ffffff;
  box-shadow: 0 14px 35px #2745361c;
}

[data-theme="light"] .help-dialog {
  border-color: var(--border);
  background: #ffffff;
}

[data-theme="light"] .dialog-close,
[data-theme="light"] .button.secondary {
  border-color: var(--border);
  background: #eef4f0;
  color: #294438;
}

[data-theme="light"] .dialog-close:hover {
  border-color: #c62836;
  background: #d93845;
  color: #ffffff;
  box-shadow: 0 5px 16px rgb(198 40 54 / 22%);
}

[data-theme="light"] .file-result-item {
  border-color: var(--border);
  background: #ffffff;
}

.intro {
  max-width: 660px;
  margin: 37px auto 28px;
  text-align: center;
}

h1 {
  margin: 0;
  font-size: clamp(29px, 5vw, 42px);
  font-weight: 750;
  letter-spacing: -0.045em;
  line-height: 1.14;
}

.intro p {
  max-width: 555px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 21px;
}

.flow span {
  padding: 7px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-soft);
  color: #d7dfeb;
  font-size: 12px;
  font-weight: 650;
}

.flow b {
  color: #53cba4;
  font-size: 17px;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
}

.section-heading h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.section-heading p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.direction-card {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 40px minmax(0, 1fr);
  align-items: end;
  gap: 14px;
  margin-bottom: 27px;
  padding: 17px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
}

.direction-field label {
  display: block;
  margin-bottom: 8px;
  color: #dce5ef;
  font-size: 12px;
  font-weight: 700;
}

.direction-field select {
  width: 100%;
  min-height: 43px;
  padding: 0 36px 0 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  font-size: 13px;
}

.direction-field select:focus-visible {
  outline: 2px solid #6ee7c0;
  outline-offset: 3px;
}

.direction-arrow {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  margin-bottom: 2px;
  color: #71daba;
  font-size: 20px;
}

.upload-zone {
  position: relative;
  display: flex;
  min-height: 203px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 25px;
  border: 1px dashed #53627a;
  border-radius: 14px;
  background: var(--surface-soft);
  text-align: center;
  transition:
    border-color 160ms ease,
    background 160ms ease,
    transform 160ms ease;
}

.upload-zone.is-dragging {
  transform: scale(1.005);
  border-color: #51d4ab;
  background: #203b3d;
}

.upload-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  margin-bottom: 12px;
  border: 1px solid #385b5a;
  border-radius: 14px;
  background: var(--green-soft);
  color: #63d7b2;
}

.upload-icon svg {
  width: 23px;
  height: 23px;
}

.upload-title {
  margin: 0;
  font-size: 15px;
  font-weight: 650;
}

.upload-help {
  margin: 6px 0 15px;
  color: var(--muted);
  font-size: 12px;
}

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

.button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0 16px;
  border: 1px solid transparent;
  border-radius: 9px;
  background: var(--green);
  color: white;
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition:
    background 140ms ease,
    border-color 140ms ease,
    transform 140ms ease;
}

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

.button:active:not(:disabled) {
  transform: translateY(1px);
}

.button:focus-visible,
.file-picker:focus-visible + .button,
textarea:focus-visible {
  outline: 2px solid #6ee7c0;
  outline-offset: 3px;
}

.button.secondary {
  border-color: var(--border);
  background: var(--surface);
  color: #e4eaf3;
}

.button.secondary:hover:not(:disabled) {
  border-color: #64748b;
  background: var(--surface-raised);
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.selected-file {
  display: none;
  align-items: flex-start;
  justify-content: space-between;
  gap: 15px;
  margin-top: 12px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}

.selected-file.is-visible {
  display: flex;
}

.file-details {
  min-width: 0;
  flex: 1;
}

.file-name {
  color: var(--text);
  font-size: 13px;
  font-weight: 650;
}

.file-size {
  margin-top: 3px;
  color: var(--muted);
  font-size: 11px;
}

.file-list {
  display: grid;
  max-height: 190px;
  gap: 5px;
  overflow: auto;
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
  font-size: 12px;
}

.file-list li {
  overflow-wrap: anywhere;
}

.status {
  min-height: 20px;
  margin: 9px 2px 0;
  color: #76ddba;
  font-size: 12px;
}

.status.is-error {
  color: var(--danger);
}

.result-card {
  display: none;
  margin-top: 17px;
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.result-card.is-visible {
  display: block;
}

.file-results {
  display: grid;
  gap: 10px;
}

.file-result-item {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface-soft);
}

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

.file-result-name {
  min-width: 0;
  color: var(--text);
  font-size: 13px;
  font-weight: 650;
  overflow-wrap: anywhere;
}

.file-result-status {
  margin: 5px 0 0;
  color: var(--success);
  font-size: 11px;
}

.file-result-status.is-error {
  color: var(--danger);
}

.file-result-item .result-preview {
  margin-top: 10px;
}

.file-preview-toggle {
  margin-top: 8px;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
}

.result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 11px;
}

.result-head h3 {
  margin: 0;
  font-size: 13px;
  font-weight: 700;
}

.result-preview {
  max-height: 210px;
  overflow: auto;
  margin: 0;
  padding: 13px;
  border: 1px solid #39485e;
  border-radius: 8px;
  background: var(--surface-soft);
  color: #dce5ef;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12px;
  line-height: 1.65;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.divider {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 29px 0;
  color: #8290a4;
  font-size: 11px;
  font-weight: 650;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.divider::before,
.divider::after {
  height: 1px;
  flex: 1;
  background: var(--border);
  content: "";
}

.text-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface-soft);
}

.text-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px minmax(0, 1fr);
  align-items: center;
  gap: 15px;
}

.text-field label {
  display: block;
  margin-bottom: 9px;
  color: #e6ecf5;
  font-size: 12px;
  font-weight: 700;
}

.text-field textarea {
  display: block;
  width: 100%;
  min-height: 184px;
  resize: vertical;
  padding: 13px 14px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text);
  font-size: 13px;
  line-height: 1.65;
}

.text-field textarea::placeholder {
  color: #8390a3;
}

.text-field textarea[readonly] {
  color: #d7e3ed;
}

.swap {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: #71daba;
  font-size: 18px;
}

.text-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 15px;
}

.text-actions .hint {
  margin-left: auto;
  color: var(--muted);
  font-size: 11px;
}

.footer {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin-top: 23px;
  padding: 13px 15px;
  border: 1px solid #344352;
  border-radius: 10px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.footer strong {
  color: #dce7f1;
}

.footer-mark {
  flex: 0 0 auto;
  color: #6ed9b7;
}

.site-footer {
  margin-top: 24px;
  padding-top: 3px;
  border-top: 1px solid var(--border);
}

.github-link {
display: flex;
min-height: 58px;
    align-items: center;
    gap: 12px;
    padding: 15px 27px;
    border-radius: 15px;
    background: #1f2937;
    color: #08c98a;
    font-size: 17px;
    font-weight: 700;
    text-decoration: none;
    transition: background-color 150ms ease, color 150ms ease, transform 150ms ease;
}

.github-link:hover {
  background: #273449;
  color: #35e2a8;
  /* transform: translateY(-1px); */
}

.github-link:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.github-link svg {
  width: 25px;
  height: 25px;
  flex: 0 0 auto;
}

@media (max-width: 680px) {
  body {
    padding: 16px 12px 28px;
  }

  .app {
    padding: 20px 16px 22px;
    border-radius: 15px;
  }

  .topbar {
    padding-bottom: 17px;
  }

  .topbar {
    align-items: flex-start;
    flex-direction: column;
    gap: 12px;
  }

  .header-controls {
    width: 100%;
    justify-content: space-between;
    gap: 4px;
  }

  .header-control {
    min-height: 36px;
    padding: 0 7px;
    font-size: 12px;
  }

  .header-control.help-control {
    padding: 0 9px;
  }

  .menu-options {
    right: auto;
    left: 0;
  }

  .header-menu.theme-menu .menu-options {
    right: 0;
    left: auto;
  }

  .intro {
    margin-top: 29px;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }

  .upload-zone {
    min-height: 190px;
    padding: 20px 14px;
  }

  .selected-file {
    flex-direction: column;
  }

  .selected-file > .button {
    width: 100%;
  }

  .file-result-head {
    align-items: flex-start;
    flex-direction: column;
  }

  .result-head {
    align-items: stretch;
    flex-direction: column;
  }

  .result-head .button {
    width: 100%;
  }

  .file-result-head .button {
    max-width: 100%;
    overflow-wrap: anywhere;
    white-space: normal;
    text-align: center;
  }

  .help-dialog {
    max-height: 86vh;
  }

  .dialog-content {
    max-height: 86vh;
    padding: 18px;
  }

  .text-card {
    padding: 15px;
  }

  .direction-card {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
    padding: 14px;
  }

  .direction-arrow {
    width: 32px;
    height: 25px;
    margin: 0 auto;
    transform: rotate(90deg);
  }

  .text-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 11px;
  }

  .swap {
    width: 32px;
    height: 32px;
    margin: 0 auto;
    transform: rotate(90deg);
  }

  .text-field textarea {
    min-height: 150px;
  }

  .text-actions .hint {
    width: 100%;
    margin-left: 0;
  }

  .github-link {
    min-height: 72px;
    padding: 17px 19px;
    font-size: 17px;
  }
}

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

  .help-dialog {
    transition: none;
  }
}