:root {
  --todo-red: #b83f45;
  --todo-pink: rgba(175, 47, 47, 0.15);
  --ink: #111827;
  --muted: #6b7280;
  --paper: #ffffff;
  --page: #f5f5f5;
  --line: #e5e7eb;
  --green: #2f8f68;
  --blue: #2d67b1;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  --sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--page);
  font-family: var(--sans);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  color: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

:focus-visible {
  outline: 3px solid #2563eb;
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 8px 13px;
  border-radius: 5px;
  color: white;
  background: #111827;
  font-weight: 700;
  transform: translateY(-180%);
}

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

.site-header,
.intro,
.mesh-control,
.demo-stage,
.explanation,
.page-footer {
  width: min(calc(100% - 40px), 1500px);
  margin-inline: auto;
}

.site-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 64px;
  border-bottom: 1px solid #dedede;
  font-size: 0.78rem;
}

.brand {
  justify-self: start;
  display: inline-flex;
  align-items: center;
}

.brand-logo {
  display: block;
  width: 160px;
  height: auto;
}

.site-header p {
  margin: 0;
  color: var(--muted);
}

.site-header strong {
  color: var(--green);
}

.back-link {
  justify-self: end;
  color: var(--muted);
  font-weight: 650;
}

.back-link:hover,
.page-footer a:hover {
  color: var(--todo-red);
}

.intro {
  padding: clamp(54px, 7vw, 94px) 0 clamp(34px, 5vw, 62px);
  text-align: center;
}

.eyebrow {
  margin: 0 0 11px;
  color: var(--todo-red);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 740;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.intro h1,
.explanation h2 {
  margin: 0;
  letter-spacing: -0.055em;
  line-height: 1.05;
}

.intro h1 {
  font-size: clamp(2.4rem, 5vw, 5rem);
  font-weight: 320;
}

.intro > p:last-child {
  max-width: 700px;
  margin: 21px auto 0;
  color: var(--muted);
  font-size: clamp(0.98rem, 1.35vw, 1.1rem);
}

.mesh-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 30px;
  padding: 22px 26px;
  border: 1px solid #d8dce1;
  border-radius: 10px;
  background: var(--paper);
  box-shadow: 0 12px 30px rgba(17, 24, 39, 0.07);
}

.mesh-control .eyebrow {
  margin-bottom: 4px;
}

.mesh-control h2 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: -0.025em;
}

.mesh-control p:last-child {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.mesh-control > button {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 22px;
  border: 0;
  border-radius: 7px;
  color: #fff;
  background: var(--todo-red);
  font-weight: 740;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(184, 63, 69, 0.24);
}

.mesh-control > button:hover {
  background: #9f343a;
}

.mesh-control > button:disabled {
  cursor: wait;
  opacity: 0.62;
}

.mesh-control > button span {
  font-size: 1.2rem;
  line-height: 1;
}

.demo-stage {
  display: grid;
  grid-template-columns: minmax(330px, 1fr) minmax(260px, 0.62fr) minmax(330px, 1fr);
  align-items: start;
  gap: clamp(18px, 2.2vw, 34px);
}

.demo-stage.has-third-client {
  grid-template-columns: repeat(3, minmax(280px, 1fr));
}

.demo-stage.has-third-client .memory-pane {
  grid-column: 1 / -1;
  grid-row: 2;
}

.client-pane {
  min-width: 0;
}

.client-label {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 12px;
  padding-inline: 4px;
}

.client-label > span {
  color: var(--todo-red);
  font-family: var(--mono);
  font-size: 0.65rem;
}

.client-label strong {
  font-size: 0.78rem;
  letter-spacing: 0.01em;
  text-transform: uppercase;
}

.client-label small {
  color: var(--green);
  font-size: 0.68rem;
  font-weight: 650;
}

.client-connection {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}

.client-connection button {
  padding: 3px 7px;
  border: 1px solid #cfd3d8;
  border-radius: 100px;
  color: #6b7280;
  background: transparent;
  font-size: 0.62rem;
  font-weight: 650;
  cursor: pointer;
}

.client-connection button:hover {
  border-color: var(--todo-red);
  color: var(--todo-red);
}

.client-connection button:disabled {
  cursor: wait;
  opacity: 0.52;
}

.client-connection #compact-demo {
  border-color: rgba(45, 103, 177, 0.35);
  color: var(--blue);
}

.client-pane.is-disconnected .client-label small {
  color: #b45309;
}

.client-pane.is-disconnected .client-connection button {
  border-color: rgba(47, 143, 104, 0.45);
  color: var(--green);
}

.client-pane.is-disconnected .todoapp {
  box-shadow:
    0 0 0 2px rgba(180, 83, 9, 0.24),
    0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp {
  position: relative;
  color: #4d4d4d;
  background: var(--paper);
  box-shadow:
    0 2px 4px 0 rgba(0, 0, 0, 0.2),
    0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp::before,
.todoapp::after {
  position: absolute;
  right: 0;
  bottom: -5px;
  left: 0;
  z-index: -1;
  height: 10px;
  border: 1px solid #d9d9d9;
  background: #fff;
  content: "";
}

.todoapp::after {
  right: 4px;
  bottom: -10px;
  left: 4px;
  z-index: -2;
}

.new-todo,
.edit-input {
  width: 100%;
  margin: 0;
  border: 0;
  color: #4d4d4d;
  background: rgba(0, 0, 0, 0.003);
  font-size: 23px;
  font-weight: 300;
  line-height: 1.35;
  outline: 0;
  box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
}

.new-todo {
  height: 66px;
  padding: 16px 16px 16px 56px;
}

.new-todo::placeholder {
  color: #949494;
  font-style: italic;
  font-weight: 300;
  opacity: 0.64;
}

.todo-main {
  position: relative;
  z-index: 2;
  border-top: 1px solid #e6e6e6;
}

.toggle-all {
  position: absolute;
  top: -66px;
  left: 0;
  width: 54px;
  height: 66px;
  padding: 0 0 8px;
  border: 0;
  color: #737373;
  background: transparent;
  font-size: 31px;
  transform: rotate(90deg);
  cursor: pointer;
}

.toggle-all.complete {
  color: #484848;
}

.todo-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.todo-item {
  position: relative;
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr) 48px;
  align-items: center;
  min-height: 59px;
  border-bottom: 1px solid #ededed;
  background: #fff;
  font-size: 22px;
}

.todo-toggle {
  width: 30px;
  height: 30px;
  margin: 0 auto;
  border: 1px solid #d9d9d9;
  border-radius: 50%;
  accent-color: #5dc2af;
  cursor: pointer;
}

.todo-title {
  display: block;
  padding: 13px 4px 13px 6px;
  overflow-wrap: anywhere;
  font-weight: 300;
  line-height: 1.35;
  transition: color 0.3s;
}

.todo-item.completed .todo-title {
  color: #949494;
  text-decoration: line-through;
}

.destroy {
  display: none;
  width: 40px;
  height: 40px;
  margin-right: 8px;
  border: 0;
  color: #949494;
  background: transparent;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}

.todo-item:hover .destroy,
.destroy:focus-visible {
  display: block;
}

.destroy:hover {
  color: var(--todo-red);
}

.edit-input {
  grid-column: 2 / 4;
  min-height: 58px;
  padding: 10px 14px;
  border: 1px solid #999;
  box-shadow: inset 0 -1px 5px rgba(0, 0, 0, 0.2);
}

.todo-footer {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  min-height: 52px;
  padding: 10px 14px;
  color: #777;
  font-size: 13px;
  text-align: center;
}

.todo-count {
  justify-self: start;
  text-align: left;
}

.todo-count strong {
  font-weight: 500;
}

.filters {
  display: flex;
  gap: 3px;
}

.filters button,
.clear-completed {
  padding: 3px 7px;
  border: 1px solid transparent;
  border-radius: 3px;
  color: inherit;
  background: transparent;
  font-size: 12px;
  cursor: pointer;
}

.filters button:hover,
.filters button[aria-pressed="true"] {
  border-color: rgba(175, 47, 47, 0.2);
}

.clear-completed {
  justify-self: end;
  padding-inline: 0;
}

.clear-completed:hover {
  text-decoration: underline;
}

.clear-completed[hidden] {
  display: block !important;
  visibility: hidden;
}

.edit-hint {
  margin: 22px 0 0;
  color: #999;
  font-size: 0.7rem;
  text-align: center;
}

.memory-pane {
  overflow: hidden;
  margin-top: 40px;
  border: 1px solid #d5d9df;
  border-radius: 12px;
  background: #111827;
  color: white;
  box-shadow: 0 20px 45px rgba(17, 24, 39, 0.18);
}

.memory-heading {
  padding: 23px 24px 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  background: linear-gradient(145deg, rgba(72, 128, 255, 0.18), transparent 65%);
}

.memory-heading p {
  margin: 0 0 7px;
  color: #93c5fd;
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.memory-heading h2 {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 2.3vw, 2.35rem);
  font-weight: 680;
  letter-spacing: -0.05em;
  line-height: 1.02;
}

#mesh-status {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  color: #a7f3d0;
  font-size: 0.67rem;
  font-weight: 650;
}

#mesh-status::before {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.12);
  content: "";
}

.filesystem-browser {
  margin: 14px;
  border: 1px solid rgba(255, 255, 255, 0.11);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.035);
}

.filesystem-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.filesystem-heading strong,
.file-inspector-heading span {
  color: #d1d5db;
  font-family: var(--mono);
  font-size: 0.61rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.filesystem-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.filesystem-heading button {
  padding: 0;
  border: 0;
  color: #93c5fd;
  background: transparent;
  font-size: 0.64rem;
  cursor: pointer;
}

.filesystem-heading button:hover {
  color: #fff;
}

.filesystem-heading button:disabled {
  color: #6b7280;
  cursor: not-allowed;
}

.filesystem-tree {
  max-height: 220px;
  margin: 0;
  padding: 10px 8px 12px;
  overflow-y: auto;
}

.filesystem-tree ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.filesystem-tree ul ul {
  padding-left: 14px;
}

.filesystem-directory {
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 24px;
  color: #93c5fd;
  font-family: var(--mono);
  font-size: 0.64rem;
}

.filesystem-directory::before {
  color: #6b7280;
  content: "▾";
}

.filesystem-file {
  display: block;
  width: 100%;
  padding: 4px 6px;
  overflow: hidden;
  border: 0;
  border-radius: 4px;
  color: #d1d5db;
  background: transparent;
  font-family: var(--mono);
  font-size: 0.61rem;
  text-align: left;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
}

.filesystem-file::before {
  margin-right: 6px;
  color: #6ee7b7;
  content: "◇";
}

.filesystem-file:hover,
.filesystem-file[aria-current="true"] {
  color: #fff;
  background: rgba(96, 165, 250, 0.18);
}

.filesystem-file.is-new {
  animation: file-flash 0.8s ease-out;
}

@keyframes file-flash {
  from {
    background: rgba(52, 211, 153, 0.42);
  }
}

.filesystem-empty {
  display: block;
  padding: 8px;
  color: #9ca3af;
  font-family: var(--mono);
  font-size: 0.64rem;
}

.file-inspector {
  border-top: 1px solid rgba(255, 255, 255, 0.09);
}

.file-inspector-heading {
  display: grid;
  gap: 4px;
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.file-inspector-heading strong {
  overflow: hidden;
  color: #6ee7b7;
  font-family: var(--mono);
  font-size: 0.58rem;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#file-preview {
  max-height: 210px;
  margin: 0;
  padding: 12px;
  overflow: auto;
  color: #d1d5db;
  font-family: var(--mono);
  font-size: 0.57rem;
  line-height: 1.55;
  tab-size: 2;
}

.memory-boundary {
  margin: 0;
  padding: 5px 24px 24px;
  color: #9ca3af;
  font-size: 0.68rem;
  line-height: 1.55;
}

.memory-boundary strong {
  color: #f3f4f6;
}

.explanation {
  display: grid;
  grid-template-columns: minmax(220px, 0.75fr) minmax(420px, 1.25fr);
  gap: clamp(36px, 8vw, 110px);
  margin-top: clamp(90px, 10vw, 145px);
  padding: clamp(54px, 7vw, 92px) 0;
  border-top: 1px solid #d9d9d9;
}

.explanation .eyebrow {
  grid-column: 1;
}

.explanation h2 {
  grid-column: 1;
  max-width: 16ch;
  font-size: clamp(2rem, 3.6vw, 3.7rem);
  font-weight: 430;
}

.explanation > p:last-child {
  grid-column: 2;
  grid-row: 1 / span 2;
  align-self: end;
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.75;
}

code {
  padding: 0.12em 0.35em;
  border-radius: 4px;
  color: #374151;
  background: #e5e7eb;
  font-family: var(--mono);
  font-size: 0.82em;
}

.page-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 24px 0 34px;
  border-top: 1px solid #dedede;
  color: #8b8b8b;
  font-size: 0.7rem;
}

.site-map-footer {
  width: 100%;
  margin-top: 64px;
  padding: clamp(48px, 7vw, 76px) max(20px, calc((100% - 1500px) / 2)) 22px;
  color: #f6f7f2;
  background: #050b09;
}

.site-map-footer-grid {
  display: grid;
  grid-template-columns: minmax(240px, 0.72fr) minmax(0, 1.28fr);
  gap: clamp(52px, 9vw, 130px);
}

.site-map-brand {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
}

.site-map-brand .brand-logo {
  width: 172px;
}

.site-map-brand p {
  max-width: 290px;
  margin: 22px 0 25px;
  color: #a9b5af;
  font-size: 0.86rem;
}

.footer-demo-note {
  color: #d6ff67;
  font-size: 0.76rem;
  font-weight: 720;
}

.site-map-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(28px, 5vw, 70px);
}

.site-map-nav section {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  gap: 9px;
}

.site-map-nav h2 {
  margin: 0 0 9px;
  color: #73817a;
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.site-map-nav a {
  color: #c4cec9;
  font-size: 0.81rem;
  font-weight: 650;
}

.site-map-nav a:hover {
  color: #71f5bd;
}

.site-map-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: clamp(48px, 7vw, 78px);
  padding-top: 20px;
  border-top: 1px solid rgba(232, 248, 240, 0.16);
  color: #73817a;
  font-family: var(--mono);
  font-size: 0.62rem;
}

[hidden] {
  display: none !important;
}

@media (max-width: 1100px) {
  .site-map-footer-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .demo-stage {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .memory-pane {
    grid-column: 1 / -1;
    grid-row: 2;
    display: grid;
    grid-template-columns: 0.58fr 1.42fr;
    margin-top: 20px;
  }

  .demo-stage.has-third-client {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .demo-stage.has-third-client .client-pane[data-client="client-3"] {
    grid-column: 1 / -1;
  }

  .demo-stage.has-third-client .memory-pane {
    grid-column: 1 / -1;
    grid-row: 3;
  }

  .memory-heading {
    border-right: 1px solid rgba(255, 255, 255, 0.13);
    border-bottom: 0;
  }

  .filesystem-browser {
    margin: 14px;
  }

  .memory-boundary {
    grid-column: 1 / -1;
    padding-top: 14px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }
}

@media (max-width: 720px) {
  .site-map-nav {
    grid-template-columns: 1fr 1fr;
  }

  .site-map-nav section:last-child {
    grid-column: 1 / -1;
  }

  .site-map-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header p {
    display: none;
  }

  .demo-stage,
  .explanation {
    grid-template-columns: 1fr;
  }

  .client-pane[data-client="client-2"] {
    grid-row: 3;
  }

  .demo-stage.has-third-client .client-pane[data-client="client-2"] {
    grid-row: 2;
  }

  .demo-stage.has-third-client .client-pane[data-client="client-3"] {
    grid-column: 1;
    grid-row: 3;
  }

  .memory-pane {
    grid-column: 1;
    grid-row: 2;
    display: block;
  }

  .demo-stage.has-third-client .memory-pane {
    grid-column: 1;
    grid-row: 4;
  }

  .memory-heading {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.13);
  }

  .explanation .eyebrow,
  .explanation h2,
  .explanation > p:last-child {
    grid-column: 1;
    grid-row: auto;
  }

  .explanation > p:last-child {
    margin-top: 6px;
  }
}

@media (max-width: 500px) {
  .site-header,
  .intro,
  .mesh-control,
  .demo-stage,
  .explanation,
  .page-footer {
    width: min(calc(100% - 24px), 1500px);
  }

  .intro {
    padding-top: 42px;
  }

  .mesh-control {
    align-items: stretch;
    flex-direction: column;
    gap: 16px;
    padding: 19px;
  }

  .todo-footer {
    grid-template-columns: 1fr auto;
    gap: 8px;
  }

  .filters {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: center;
  }

  .page-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}