:root {
  color-scheme: light;
  --ink: #173238;
  --muted: #4f6668;
  --canvas: #eff4f3;
  --surface: #fff;
  --line: #c9d8d6;
  --accent: #17655d;
  --wash: #dcece7;
  --alert: #8d3f27;
  --signal: #f9eee5;
  --font: Aptos, "Segoe UI", system-ui, sans-serif;
  font: 16px/1.48 var(--font);
  color: var(--ink);
  background: var(--canvas);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; min-width: 280px; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { line-height: 1.16; }
h1 { font-size: clamp(1.8rem, 3vw, 2.75rem); letter-spacing: -.045em; }
h2 { font-size: 1.15rem; letter-spacing: -.02em; }
h3 { font-size: 1.05rem; }
a { color: var(--accent); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
button:disabled { opacity: .5; cursor: default; }
:focus-visible { outline: 2px solid #167167; outline-offset: 3px; }

.layout { width: min(100%, 1570px); margin-inline: auto; padding-inline: clamp(1rem, 3vw, 3rem); }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 2.5rem; padding: .4rem .75rem; border: 1px solid var(--line);
  border-radius: .4rem; background: var(--surface); color: var(--ink); font-weight: 600;
}
.button:hover:not(:disabled) { background: var(--canvas); }
.button.primary { border-color: var(--accent); background: var(--accent); color: #fff; }
.button.primary:hover:not(:disabled) { background: #0f504a; }
.button.subtle { justify-self: start; color: var(--accent); background: var(--wash); border-color: transparent; }
.button.quiet { border-color: transparent; background: transparent; }
.button.danger { color: var(--alert); }
.button-group { display: flex; flex-wrap: wrap; gap: .4rem; align-items: center; }

input, select, textarea {
  display: block; width: 100%; min-width: 0; min-height: 2.55rem;
  padding: .5rem .65rem; border: 1px solid #aebfbd; border-radius: .35rem; background: #fff;
}
textarea { resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
.fields { display: grid; gap: .85rem; }
.field { display: grid; gap: .3rem; min-width: 0; }
.field-label { font-size: .88rem; font-weight: 600; }
.hint { color: var(--muted); font-size: .85rem; }
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .75rem; }

.app-header {
  display: flex; justify-content: space-between; align-items: center; gap: 1rem;
  min-height: 4.1rem; padding: .6rem clamp(1rem, 3vw, 3rem);
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: center; gap: .65rem; font-size: 1.16rem; font-weight: 750; letter-spacing: -.03em; }
.brand-mark {
  display: inline-grid; place-items: center; width: 2.1rem; height: 2.1rem; border-radius: .45rem .45rem .45rem 0;
  background: var(--accent); color: #fff; font-weight: 650; font-size: 1rem; letter-spacing: -.04em;
}
.home-link { color: inherit; text-decoration: none; }
.account { display: flex; flex-wrap: wrap; align-items: center; justify-content: flex-end; gap: .5rem; min-width: 0; }
.account a { text-decoration: none; }
.account a[aria-current="page"] { color: var(--accent); background: var(--wash); }
.username { font-size: .9rem; color: var(--muted); max-width: 20ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.header-status, .operation-status, .list-status { color: var(--alert); font-size: .9rem; }
.operation-status[data-state="ok"] { color: var(--accent); }
.operation-status:empty, .header-status:empty, .list-status:empty { display: none; }
.route-state { display: grid; gap: 1rem; padding-block: 2rem; }

.sign-in {
  min-height: 100svh; display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  background: var(--surface);
}
.sign-in-intro {
  display: grid; align-content: space-between; gap: 2rem; min-height: 100%;
  padding: clamp(2rem, 6vw, 6rem); background: #173d40; color: #f0f8f6;
}
.sign-in-intro .brand-mark { background: #b6ded1; color: #173d40; }
.sign-in-title { display: grid; gap: 1.1rem; align-self: center; }
.sign-in-title h1 { max-width: 14ch; font-size: clamp(2.35rem, 5vw, 4.9rem); line-height: 1; }
.sign-in-title p { max-width: 38ch; color: #c2dad6; }
.sign-in-label { font-size: .88rem; font-weight: 650; }
.sign-in-sample { display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1rem; padding-top: 1rem; border-top: 1px solid #65948d; font-size: .86rem; }
.sign-in-sample span:first-child { font-weight: 700; }
.sign-in-panel { width: min(100%, 30rem); align-self: center; justify-self: center; padding: clamp(1.5rem, 5vw, 3.25rem); }
.sign-in-panel h2 { font-size: 1.7rem; }
.sign-in-panel > p { color: var(--muted); margin: .5rem 0 1.5rem; }
.login-form .button { justify-self: start; min-width: 6rem; }

.notebook { display: grid; grid-template-columns: 10rem minmax(0, 1fr); gap: clamp(1rem, 4vw, 4rem); padding-block: 2.6rem; }
.notebook-nav { display: flex; flex-direction: column; gap: .3rem; }
.sidebar-label { color: var(--muted); font-size: .86rem; font-weight: 650; padding: .35rem .75rem; }
.notebook-nav a { text-decoration: none; font-weight: 600; padding: .55rem .75rem; color: var(--ink); border-radius: .35rem; }
.notebook-nav a[aria-current] { background: var(--wash); color: var(--accent); }
.notebook-nav a:hover { background: var(--wash); }
.notebook-main { min-width: 0; }
.page-head { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 2rem; }
.page-head p { color: var(--muted); margin-top: .55rem; }
.listing { background: var(--surface); border: 1px solid var(--line); border-radius: .7rem; overflow: clip; }
.account-panel { width: min(100%, 32rem); }
.account-form { padding: 1.2rem; }
.account-form .button { justify-self: start; }
.list-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .75rem; padding: 1rem 1.2rem; border-bottom: 1px solid var(--line); }
.list-head input { width: min(100%, 23rem); }
.list-status { padding: .85rem 1.2rem; }
.empty { padding: clamp(1.5rem, 6vw, 5rem) 1.25rem; display: grid; gap: .6rem; justify-items: center; text-align: center; }
.empty p { color: var(--muted); max-width: 34ch; }
.empty-mark { font-size: 1.5rem; background: var(--wash); color: var(--accent); border-radius: .45rem; padding: .2rem .65rem; }
.entries { padding: 0; margin: 0; list-style: none; }
.entry { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: .4rem 1rem; padding: .9rem 1.2rem; }
.entry + .entry { border-top: 1px solid var(--line); }
.entry-main { min-width: 0; }
.entry-title { display: block; padding: 0; border: 0; background: none; font-weight: 700; text-align: left; overflow-wrap: anywhere; }
button.entry-title:hover { text-decoration: underline; color: var(--accent); }
.entry-meta, .entry-end { display: flex; align-items: center; flex-wrap: wrap; gap: .35rem .75rem; color: var(--muted); font-size: .85rem; }
.entry-meta { margin-top: .2rem; }
.entry-end .button { font-size: .85rem; min-height: 2.2rem; }
.code, .entry-date { font-variant-numeric: tabular-nums; }
.tag, .entry-state { padding: .1rem .45rem; border-radius: .3rem; background: var(--canvas); overflow-wrap: anywhere; }
.notebook-list .load-more { margin: .8rem 1.2rem; }

dialog {
  width: min(42rem, calc(100% - 2rem)); max-height: 90svh; padding: 1.25rem;
  border: 1px solid var(--line); border-radius: .7rem; color: var(--ink);
}
dialog::backdrop { background: rgb(20 45 47 / 55%); }
.dialog-head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: 1rem; }

@media (max-width: 690px) {
  .notebook { grid-template-columns: minmax(0, 1fr); gap: 1rem; padding-block: 1rem 2rem; }
  .notebook-nav { flex-direction: row; flex-wrap: wrap; align-items: center; }
  .sidebar-label { padding-left: 0; }
  .page-head { margin-bottom: 1.2rem; }
  .sign-in { grid-template-columns: minmax(0, 1fr); align-content: start; }
  .sign-in-intro { padding: 1.35rem; gap: 1.3rem; }
  .sign-in-title { gap: .7rem; }
  .sign-in-title h1 { max-width: 19ch; }
  .sign-in-sample { display: none; }
  .sign-in-panel { justify-self: start; }
}
@media (max-width: 410px) {
  .pair { grid-template-columns: minmax(0, 1fr); }
  .username { display: none; }
}
.session-checking dialog, .session-checking dialog::backdrop { visibility: hidden; }