@charset "UTF-8";
:root {
  color-scheme: dark;
  --bg: #10212c;
  --panel: #192e3b;
  --line: #314956;
  --text: #edf4f8;
  --muted: #b0c3d0;
  --subtle: #819baa;
  --accent: #26d4bd;
  --purple: #c3b6ed;
  font-family:
    Inter,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  font-synthesis: none;
  color: var(--text);
  background: var(--bg);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}
button,
input,
a {
  font: inherit;
  -webkit-tap-highlight-color: transparent;
}
button,
a,
label {
  touch-action: manipulation;
}
button {
  cursor: pointer;
}
button,
a {
  color: inherit;
}
a {
  text-decoration: none;
}
button {
  border: 0;
}
img {
  display: block;
}
input,
button {
  min-width: 0;
}
input {
  color: var(--text);
}
[hidden] {
  display: none !important;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 5px;
}
.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  padding: 12px;
  background: var(--accent);
  color: #10212c;
  z-index: 20;
}
.skip-link:focus {
  top: 10px;
}
.topbar {
  height: 104px;
  display: flex;
  align-items: center;
  padding: 0 36px;
  gap: 26px;
  border-bottom: 1px solid var(--line);
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  white-space: nowrap;
}
.brand > img {
  width: 52px;
  height: 52px;
  object-fit: contain;
}
.brand > span {
  font-size: 28px;
  font-weight: 650;
  letter-spacing: 0.3px;
}
.brand b {
  font-weight: 500;
}
.brand-divider {
  height: 31px;
  width: 1px;
  background: var(--line);
}
.tagline {
  font-size: 18px;
  color: var(--muted);
  letter-spacing: 1px;
}
.topbar > nav {
  margin-left: auto;
  display: flex;
  gap: 24px;
  align-items: center;
}
.text-button,
.home-link {
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  padding: 7px 0;
}
.text-button:hover,
.home-link:hover {
  color: var(--accent);
}
.text-button img,
.home-link img {
  width: 19px;
  height: 19px;
}
.app-shell {
  display: grid;
  grid-template-columns: 186px minmax(0, 1fr);
  min-height: calc(100svh - 172px);
}
.sidebar {
  border-right: 1px solid var(--line);
  padding-top: 37px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding-bottom: 28px;
}
.mode-tabs {
  display: grid;
  gap: 9px;
}
.mode {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 66px;
  padding: 16px 27px 16px 32px;
  background: transparent;
  color: var(--muted);
  font-size: 20px;
  border-radius: 0 7px 7px 0;
  text-align: left;
}
.mode > img {
  width: 30px;
  height: 30px;
}
.mode.active {
  background: #193c46;
  color: var(--accent);
}
.mode.active:before {
  content: "";
  height: 100%;
  width: 4px;
  border-radius: 0 4px 4px 0;
  position: absolute;
  top: 0;
  left: 0;
  background: var(--accent);
}
.mode.active > img {
  filter: brightness(0) saturate(100%) invert(81%) sepia(80%) saturate(567%)
    hue-rotate(108deg) brightness(87%) contrast(92%);
}
.reset {
  font-size: 12px;
  justify-content: center;
  color: var(--subtle);
  padding: 10px;
}
.reset img {
  width: 16px;
  height: 16px;
}
main {
  padding: 40px 40px 42px;
  min-width: 0;
}
.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1.54fr) minmax(310px, 1fr);
  gap: 36px;
  max-width: 1510px;
  margin: auto;
  min-height: 100%;
}
.input-column {
  min-width: 0;
}
.section-heading h1 {
  font-size: 54px;
  line-height: 1.2;
  letter-spacing: -0.8px;
  margin: 0 0 14px;
  font-weight: 650;
}
.section-heading p {
  font-size: 18px;
  color: var(--muted);
  margin: 0;
  line-height: 1.6;
}
.input-files {
  margin-top: 34px;
}
h2 {
  font-size: 24px;
  line-height: 1.4;
  margin: 0 0 19px;
  letter-spacing: 0.3px;
  font-weight: 600;
}
.file-list {
  display: grid;
  gap: 18px;
}
.file-row {
  position: relative;
  display: flex;
  align-items: center;
  gap: 20px;
  border: 1px solid var(--line);
  background: var(--panel);
  min-height: 116px;
  padding: 21px 24px;
  border-radius: 7px;
  cursor: pointer;
  transition:
    border-color 0.15s,
    background 0.15s;
  min-width: 0;
}
.file-row:hover,
.file-row.dragover {
  border-color: var(--accent);
  background: #1d3a46;
}
.file-row:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.file-row > input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}
.file-icon {
  display: grid;
  place-items: center;
  width: 51px;
  height: 58px;
  border-radius: 7px;
  flex-shrink: 0;
}
.file-icon img {
  width: 37px;
  height: 37px;
  filter: brightness(0.35) saturate(0.5);
}
.green {
  background: #c5e49b;
}
.lavender {
  background: var(--purple);
}
.file-details {
  display: grid;
  gap: 7px;
  min-width: 0;
  flex: 1;
}
.file-details strong {
  font-size: 19px;
  font-weight: 550;
}
.filename {
  font-size: 16px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: ui-monospace, SFMono-Regular, Consolas, "PingFang SC", monospace;
}
.file-size {
  color: var(--muted);
  font-size: 15px;
  white-space: nowrap;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.choose-label {
  color: var(--accent);
  font-size: 16px;
  padding-left: 21px;
  border-left: 1px solid #526774;
  flex-shrink: 0;
}
.structure {
  margin-top: 52px;
}
.bar-labels {
  display: flex;
  justify-content: space-between;
  font-size: 16px;
  margin: 0 22px 12px;
  color: var(--text);
}
.byte-bar {
  height: 38px;
  display: flex;
  gap: 2px;
  overflow: hidden;
  border-radius: 5px;
  background: var(--panel);
}
#carrier-bar {
  background: var(--accent);
  width: 25%;
}
#payload-bar {
  background: var(--purple);
  flex: 1;
}
.byte-bar.empty {
  opacity: 0.3;
}
.byte-ticks {
  position: relative;
  display: flex;
  justify-content: space-between;
  margin-top: 10px;
  padding-top: 15px;
  font-size: 16px;
  color: var(--muted);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.byte-ticks span:before {
  content: "";
  position: absolute;
  top: 0;
  width: 1px;
  height: 10px;
  background: var(--muted);
}
#gap-tick {
  position: absolute;
  left: 25%;
  transform: translateX(-50%);
}
#gap-tick:before {
  left: 50%;
}
.byte-ticks > span:last-child:before {
  right: 0;
}
.structure > p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.7;
  margin: 31px 4px 0;
}
.output-column {
  border-left: 1px solid #59707f;
  padding-left: 34px;
  min-width: 0;
}
.output-column > h2 {
  font-size: 32px;
  margin: 0 0 43px;
}
.field-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 18px;
  color: var(--text);
  margin: 0 0 12px;
}
.field-label > span {
  font-size: 11px;
  color: var(--subtle);
  white-space: nowrap;
}
.name-input,
.gap-input {
  display: flex;
  align-items: center;
  width: 100%;
  border: 1px solid #4b6475;
  background: var(--panel);
  border-radius: 6px;
  height: 59px;
  overflow: hidden;
}
.name-input:focus-within,
.gap-input:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}
.name-input input,
.gap-input input {
  background: transparent;
  border: 0;
  outline: none;
  flex: 1;
  width: 100%;
  height: 100%;
  padding: 15px 19px;
  font-size: 19px;
  font-family: ui-monospace, SFMono-Regular, Consolas, "PingFang SC", monospace;
}
.name-input > span {
  border-left: 1px solid #4b6475;
  min-width: 71px;
  text-align: center;
  padding: 15px 12px;
  font-size: 17px;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.gap-field {
  margin-top: 30px;
}
.gap-input > span {
  font-size: 17px;
  color: var(--muted);
  padding: 0 16px;
}
.gap-input > button {
  border-left: 1px solid #4b6475;
  background: transparent;
  padding: 17px 15px;
  display: grid;
  place-items: center;
  height: 100%;
}
.gap-input > button:hover {
  background: #264955;
}
.gap-input img {
  width: 21px;
  height: 21px;
}
.input-help {
  font-size: 12px;
  line-height: 1.6;
  color: var(--subtle);
  margin: 8px 0 0;
}
.file-stats {
  display: grid;
  gap: 28px;
  margin: 28px 0 44px;
}
.file-stats > div {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 17px;
}
.file-stats dt {
  color: var(--muted);
}
.file-stats dd {
  margin: 0;
  min-width: 120px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px 13px;
  text-align: right;
  font:
    18px/1.4 ui-monospace,
    SFMono-Regular,
    Consolas,
    monospace;
  color: var(--text);
}
.checkbox {
  display: flex;
  align-items: center;
  gap: 13px;
  font-size: 17px;
  margin: 0 0 55px;
  cursor: pointer;
}
.checkbox input {
  accent-color: var(--accent);
  width: 25px;
  height: 25px;
  margin: 0;
  cursor: pointer;
}
.primary {
  display: flex;
  width: 100%;
  min-height: 66px;
  justify-content: center;
  align-items: center;
  background: var(--accent);
  color: #092731;
  font-size: 22px;
  font-weight: 650;
  border-radius: 7px;
  padding: 16px;
  transition: background 0.15s;
}
.primary:hover {
  background: #62e5d2;
}
.primary:disabled {
  opacity: 0.55;
  cursor: wait;
}
.untouched {
  font-size: 15px;
  color: var(--muted);
  margin: 17px 0 0;
}
.statusbar {
  min-height: 68px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 17px 36px;
  color: var(--muted);
  font-size: 15px;
  gap: 16px;
}
.statusbar > span {
  display: flex;
  align-items: center;
  gap: 13px;
}
.statusbar img {
  width: 24px;
  height: 24px;
}
.import-area {
  border-top: 1px solid var(--line);
  margin-top: 22px;
  padding-top: 22px;
}
.import-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--accent);
  border: 1px solid #397d7c;
  padding: 10px 13px;
  border-radius: 5px;
  font-size: 14px;
  cursor: pointer;
}
.import-button input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}
.import-button img {
  width: 18px;
  height: 18px;
}
.import-area > p {
  color: var(--subtle);
  font-size: 12px;
  line-height: 1.7;
  overflow-wrap: anywhere;
}
.import-button:focus-within {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}
.error {
  font-size: 13px;
  line-height: 1.8;
  background: #412e31;
  border: 1px solid #91545b;
  color: #ffd2d3;
  border-radius: 6px;
  padding: 12px 14px;
  margin-top: 22px;
}
.result {
  border-top: 1px solid var(--line);
  padding-top: 21px;
  margin-top: 23px;
}
.result-heading {
  display: flex;
  gap: 9px;
  align-items: center;
}
.result-heading img {
  width: 22px;
  height: 22px;
}
.result h3 {
  font-size: 17px;
  margin: 0;
  font-weight: 550;
}
.result > p {
  font-size: 12px;
  color: var(--muted);
  overflow-wrap: anywhere;
  line-height: 1.8;
  margin: 8px 0 16px;
}
.download-button,
.secondary {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  padding: 12px 10px;
  border: 1px solid #3a8b84;
  border-radius: 6px;
  font-size: 14px;
  color: var(--accent);
  margin-top: 10px;
}
.download-button {
  background: #183e43;
}
.download-button:hover,
.secondary:hover {
  background: #215355;
}
.download-button img {
  width: 18px;
  height: 18px;
}
.result > p:last-child {
  margin-bottom: 0;
  color: var(--subtle);
}
.toast {
  position: fixed;
  bottom: 27px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 90vw;
  background: #224c50;
  border: 1px solid #478883;
  color: var(--text);
  box-shadow: 0 8px 30px #0004;
  padding: 12px 20px;
  border-radius: 7px;
  font-size: 13px;
  z-index: 10;
}
dialog {
  background: #142a37;
  color: var(--text);
  border: 1px solid #4b6475;
  border-radius: 12px;
  width: min(580px, calc(100vw - 32px));
  padding: 28px;
  box-shadow: 0 25px 90px #0009;
}
dialog::backdrop {
  background: #030c12bb;
}
.dialog-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}
.dialog-top h2 {
  font-size: 23px;
  margin: 0;
}
.dialog-top button {
  background: transparent;
  padding: 6px;
}
.dialog-top img {
  width: 24px;
  height: 24px;
}
dialog p,
dialog li {
  font-size: 14px;
  line-height: 1.9;
  color: var(--muted);
}
dialog ol {
  padding-left: 24px;
}
dialog li {
  margin: 14px 0;
}
.help-note {
  padding: 14px;
  background: #203947;
  border-left: 2px solid var(--accent);
  font-size: 13px;
  line-height: 1.9;
  color: var(--muted);
}
dialog .help-foot {
  font-size: 12px;
  color: var(--subtle);
}
@media (min-width: 1600px) {
  main {
    padding: 50px;
  }
  .workspace {
    gap: 48px;
  }
  .section-heading h1 {
    font-size: 48px;
  }
  .input-files {
    margin-top: 55px;
  }
  .file-row {
    min-height: 123px;
  }
  .output-column {
    padding-left: 40px;
  }
  .structure {
    margin-top: 55px;
  }
}
@media (max-width: 1250px) {
  .topbar {
    padding: 0 27px;
    gap: 20px;
  }
  .brand > span {
    font-size: 25px;
  }
  .tagline {
    font-size: 15px;
  }
  .topbar > nav {
    gap: 15px;
  }
  .app-shell {
    grid-template-columns: 135px minmax(0, 1fr);
  }
  main {
    padding: 32px 27px;
  }
  .workspace {
    grid-template-columns: minmax(0, 1.4fr) minmax(285px, 1fr);
    gap: 26px;
  }
  .output-column {
    padding-left: 25px;
  }
  .mode {
    padding: 16px 18px;
    gap: 13px;
  }
  .mode > img {
    width: 26px;
    height: 26px;
  }
  .section-heading h1 {
    font-size: 38px;
  }
  .section-heading p {
    font-size: 15px;
  }
  .file-row {
    gap: 14px;
    padding: 18px 16px;
  }
  .file-size {
    font-size: 12px;
  }
  .file-details strong {
    font-size: 17px;
  }
  .filename {
    font-size: 13px;
  }
  .choose-label {
    padding-left: 13px;
    font-size: 14px;
  }
  .file-icon {
    width: 43px;
    height: 50px;
  }
  .file-icon img {
    width: 30px;
    height: 30px;
  }
  .field-label {
    font-size: 16px;
  }
  .file-stats > div {
    font-size: 14px;
  }
  .file-stats dd {
    font-size: 16px;
    min-width: 105px;
  }
  .primary {
    font-size: 19px;
  }
  .checkbox {
    font-size: 15px;
  }
  .output-column > h2 {
    font-size: 27px;
  }
  .topbar .home-link {
    font-size: 12px;
  }
}
@media (max-width: 1000px) {
  .tagline,
  .brand-divider {
    display: none;
  }
  .app-shell {
    grid-template-columns: 108px minmax(0, 1fr);
  }
  .mode {
    font-size: 17px;
    gap: 10px;
    padding-left: 14px;
    padding-right: 10px;
  }
  .mode > img {
    width: 23px;
    height: 23px;
  }
  .workspace {
    grid-template-columns: minmax(0, 1fr) 285px;
    gap: 22px;
  }
  main {
    padding-left: 22px;
    padding-right: 22px;
  }
  .output-column {
    padding-left: 22px;
  }
  .file-row {
    flex-wrap: wrap;
    gap: 10px 12px;
  }
  .file-details {
    min-width: calc(100% - 70px);
  }
  .file-size {
    margin-left: 55px;
  }
  .choose-label {
    margin-left: auto;
  }
  .section-heading h1 {
    font-size: 34px;
  }
  .output-column > h2 {
    font-size: 25px;
  }
  .checkbox {
    font-size: 14px;
  }
  .structure > p {
    font-size: 13px;
  }
  .reset {
    font-size: 10px;
    gap: 5px;
  }
}
@media (max-width: 760px) {
  .topbar {
    height: 78px;
    padding: 0 20px;
    gap: 12px;
  }
  .brand > img {
    width: 40px;
    height: 40px;
  }
  .brand {
    gap: 9px;
  }
  .brand > span {
    font-size: 22px;
  }
  .topbar > nav {
    gap: 12px;
  }
  .topbar .home-link {
    display: none;
  }
  .text-button {
    font-size: 12px;
  }
  .app-shell {
    display: block;
    min-height: calc(100svh - 142px);
  }
  .sidebar {
    flex-direction: row;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 10px 20px;
    align-items: center;
    gap: 10px;
  }
  .mode-tabs {
    display: flex;
    gap: 7px;
  }
  .mode {
    border-radius: 5px;
    min-height: 44px;
    padding: 10px 16px;
    gap: 9px;
    font-size: 15px;
  }
  .mode.active:before {
    display: none;
  }
  .mode > img {
    width: 21px;
    height: 21px;
  }
  .reset {
    font-size: 11px;
    padding: 8px 0;
  }
  .reset img {
    width: 14px;
    height: 14px;
  }
  main {
    padding: 27px 20px 32px;
  }
  .workspace {
    display: block;
  }
  .section-heading h1 {
    font-size: 30px;
    margin-bottom: 10px;
  }
  .section-heading p {
    font-size: 14px;
  }
  .input-files {
    margin-top: 28px;
  }
  h2 {
    font-size: 20px;
    margin-bottom: 15px;
  }
  .file-row {
    flex-wrap: nowrap;
    min-height: 95px;
    gap: 13px;
    padding: 17px 15px;
  }
  .file-details {
    min-width: 0;
  }
  .file-details strong {
    font-size: 15px;
  }
  .filename {
    font-size: 12px;
  }
  .file-icon {
    width: 39px;
    height: 47px;
  }
  .file-size {
    display: none;
  }
  .choose-label {
    font-size: 12px;
    padding-left: 12px;
  }
  .file-list {
    gap: 13px;
  }
  .structure {
    margin-top: 28px;
  }
  .bar-labels {
    font-size: 13px;
    margin: 0 10px 10px;
  }
  .byte-bar {
    height: 28px;
  }
  .byte-ticks {
    font-size: 13px;
  }
  .structure > p {
    font-size: 12px;
    margin-top: 24px;
  }
  .output-column {
    border-left: 0;
    border-top: 1px solid var(--line);
    padding: 26px 0 0;
    margin-top: 30px;
  }
  .output-column > h2 {
    font-size: 23px;
    margin-bottom: 24px;
  }
  .field-label {
    font-size: 15px;
  }
  .name-input,
  .gap-input {
    height: 53px;
  }
  .name-input input,
  .gap-input input {
    font-size: 17px;
    padding: 12px 15px;
  }
  .name-input > span {
    font-size: 15px;
  }
  .gap-field {
    margin-top: 23px;
  }
  .file-stats {
    margin: 24px 0 28px;
    gap: 14px;
  }
  .file-stats dd {
    font-size: 16px;
    min-width: 115px;
  }
  .checkbox {
    font-size: 15px;
    margin-bottom: 25px;
  }
  .checkbox input {
    width: 23px;
    height: 23px;
  }
  .primary {
    min-height: 56px;
    font-size: 18px;
  }
  .untouched {
    font-size: 12px;
    margin-top: 13px;
  }
  .statusbar {
    padding: 16px 20px;
    font-size: 11px;
    min-height: 64px;
  }
  .statusbar > span {
    gap: 7px;
  }
  .statusbar img {
    width: 18px;
    height: 18px;
  }
  .import-area {
    padding-top: 18px;
    margin-top: 18px;
  }
  dialog {
    padding: 22px;
  }
  .dialog-top h2 {
    font-size: 20px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}

.processing {
  margin-top: 16px;
  padding: 12px;
  border: 1px solid #355565;
  border-radius: 8px;
}
.processing p {
  margin: 0 0 10px;
  font-size: 12px;
  color: #a8c4cf;
}
.processing progress {
  width: 100%;
  height: 8px;
  accent-color: #57d2c5;
}
.processing button {
  margin-top: 10px;
}
.primary:disabled {
  opacity: 0.65;
  cursor: wait;
}
.verification {
  font-size: 12px;
  color: #75d9c8;
  line-height: 1.6;
}
.result[data-verification="unverified"] .verification {
  color: #efc381;
}
.result[data-verification="unverified"] .result-heading img {
  display: none;
}
.result {
  scroll-margin-top: 24px;
}
#result-title:focus {
  outline: 2px solid #57d2c5;
  outline-offset: 5px;
  border-radius: 2px;
}
#reuse-result {
  width: 100%;
  margin-top: 10px;
  cursor: pointer;
  background: transparent;
  font: inherit;
}
@media (max-width: 600px) {
  .topbar nav {
    gap: 10px;
  }
  .topbar .home-link {
    display: none;
  }
  #load-demo {
    font-size: 12px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}