:root {
  color-scheme: light;
  --ink: #3d4b47;
  --ink-soft: #66756f;
  --ink-faint: #82908a;
  --cream: #fffaf0;
  --paper: #fffdf6;
  --paper-raised: #fffefb;
  --water: #78bfc0;
  --water-deep: #397b78;
  --water-wash: rgba(120, 191, 192, 0.14);
  --leaf: #b7d8c4;
  --leaf-deep: #416d58;
  --leaf-wash: rgba(183, 216, 196, 0.2);
  --coral: #a95732;
  --coral-wash: rgba(243, 182, 141, 0.2);
  --line: rgba(61, 75, 71, 0.16);
  --line-strong: rgba(61, 75, 71, 0.28);
  --danger: #a6533c;
  --danger-wash: rgba(166, 83, 60, 0.1);
  --shadow: 0 20px 52px rgba(76, 86, 75, 0.12);
  --radius-outer: 26px;
  --radius-inner: 14px;
  font-family: ui-rounded, "SF Pro Rounded", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

[hidden] { display: none !important; }

html { min-width: 0; }

body {
  margin: 0;
  min-width: 0;
  min-height: 100vh;
  overflow-x: clip;
  color: var(--ink);
  background:
    linear-gradient(var(--water-wash) 1px, transparent 1px) 0 140px / 100% 64px,
    radial-gradient(circle at 8% 2%, var(--coral-wash), transparent 29rem),
    linear-gradient(180deg, #eef6e8 0%, #f9f2df 68%, #f4dfc9 100%);
}

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

button,
input,
select,
.event-entry { min-height: 44px; }

button,
input,
select,
textarea { border-radius: var(--radius-inner); }

button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.event-entry:focus-visible {
  outline: 3px solid var(--water-deep);
  outline-offset: 3px;
}

button {
  border: 1px solid transparent;
  padding: 11px 17px;
  color: var(--paper);
  background: var(--coral);
  font-weight: 750;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 7px 18px rgba(166, 83, 60, 0.2);
}

button:active:not(:disabled) { transform: translateY(0); }
button:disabled { cursor: not-allowed; opacity: 0.46; }
button.secondary { color: var(--water-deep); background: var(--water-wash); border-color: var(--water); }
button.quiet { color: var(--ink); background: transparent; border-color: var(--line-strong); }

h1,
h2,
h3,
p { margin-top: 0; }

h1 {
  max-width: 10ch;
  margin-bottom: 12px;
  font-family: "Songti SC", "STSong", Georgia, serif;
  font-size: clamp(2.55rem, 7vw, 5.3rem);
  line-height: 0.96;
  letter-spacing: -0.07em;
}

h2 { margin-bottom: 8px; font-size: clamp(1.12rem, 2vw, 1.35rem); letter-spacing: -0.02em; }
h3 { margin-bottom: 12px; font-size: 0.98rem; }
p { line-height: 1.65; }

.masthead,
main,
footer {
  width: min(1180px, calc(100% - 32px));
  margin-inline: auto;
}

.masthead {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding: 56px 0 28px;
}

.masthead-copy { min-width: 0; }
.lede { max-width: 42rem; margin-bottom: 0; color: var(--ink-soft); }
.eyebrow,
.section-mark {
  margin-bottom: 8px;
  color: var(--coral);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.signal-lantern {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 214px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: 50% 50% var(--radius-inner) var(--radius-inner);
  background: var(--paper-raised);
  box-shadow: var(--shadow);
}

.signal-lantern small,
.signal-lantern strong { display: block; }
.signal-lantern small { margin-bottom: 2px; color: var(--ink-soft); }
.signal-light { width: 18px; height: 18px; flex: 0 0 auto; border: 3px solid var(--paper); border-radius: 50%; background: var(--ink-faint); box-shadow: 0 0 0 1px var(--line-strong); }
.signal-light[data-state="connecting"] { background: var(--coral); }
.signal-light[data-state="online"] { background: var(--leaf-deep); }
.signal-light[data-state="offline"] { background: var(--ink-faint); }
.signal-light[data-state="error"] { background: var(--danger); }

main { display: grid; gap: 22px; }

.connection-desk,
.room-strip,
.composer,
.message-ledger,
.delivery-ledger,
.request-ledger,
.seat-roster,
.close-receipt {
  min-width: 0;
  border: 1px solid rgba(255, 255, 255, 0.82);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.connection-desk {
  display: grid;
  grid-template-columns: minmax(220px, 0.55fr) minmax(0, 1.45fr);
  gap: 28px;
  padding: 26px;
  border-radius: var(--radius-outer);
}

.section-intro p:last-child { max-width: 38ch; margin-bottom: 0; color: var(--ink-soft); font-size: 0.9rem; }
.connection-form { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; min-width: 0; }
.connection-form label { min-width: 0; color: var(--ink-soft); font-size: 0.82rem; font-weight: 700; }
.connection-form label span { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 6px; margin-bottom: 7px; }
.connection-form label small { color: var(--ink-soft); font-weight: 500; }
.connection-form input { width: 100%; min-width: 0; padding: 11px 13px; border: 1px solid var(--line-strong); color: var(--ink); background: var(--paper-raised); }
.form-actions { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 10px; }
.connection-note { grid-column: 1 / -1; min-height: 1.65em; margin: 0; overflow-wrap: anywhere; color: var(--ink-soft); font-size: 0.88rem; }

.observatory { display: grid; gap: 22px; }
.room-strip { display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); gap: 24px; padding: 26px; border-radius: var(--radius-outer); }
.room-heading { min-width: 0; padding-left: 18px; border-left: 5px solid var(--water); }
.room-heading h2 { font-family: "Songti SC", "STSong", Georgia, serif; font-size: clamp(1.55rem, 3vw, 2.35rem); }
.room-agenda { margin-bottom: 0; color: var(--ink-soft); }
.room-facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; margin: 0; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-inner); background: var(--line); }
.room-facts div { min-width: 0; padding: 13px 15px; background: var(--paper-raised); }
.room-facts dt { color: var(--ink-soft); font-size: 0.75rem; }
.room-facts dd { margin: 5px 0 0; overflow-wrap: anywhere; font-weight: 750; }
.tide-fact dd { color: var(--water-deep); font: 750 1.32rem ui-monospace, monospace; font-variant-numeric: tabular-nums; }
.tide-fact dd small { font: 500 0.7rem ui-rounded, sans-serif; }

.composer {
  display: grid;
  grid-template-columns: minmax(210px, 0.38fr) minmax(0, 1fr);
  gap: 26px;
  padding: 26px;
  border-radius: var(--radius-outer);
}
.composer-intro { align-self: start; }
.composer-form { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(210px, 0.8fr); gap: 14px; min-width: 0; }
.composer-form > label { min-width: 0; color: var(--ink-soft); font-size: 0.82rem; font-weight: 700; }
.composer-form > label > span { display: block; margin-bottom: 7px; }
.reply-mode {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-width: 0;
  padding: 12px 14px;
  border-left: 4px solid var(--water-deep);
  background: var(--water-wash);
}
.reply-mode > div { display: grid; flex: 1 1 280px; gap: 3px; min-width: 0; }
.reply-mode small { color: var(--water-deep); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.08em; }
.reply-mode strong,
.reply-mode span { overflow-wrap: anywhere; }
.reply-mode span { color: var(--ink-soft); font-size: 0.76rem; line-height: 1.5; }
.reply-mode .reply-mode-source-body {
  display: -webkit-box;
  overflow: hidden;
  color: var(--ink);
  font-size: 0.82rem;
  white-space: pre-wrap;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}
.reply-mode .reply-mode-note { font: 500 0.68rem ui-monospace, monospace; }
.composer-form textarea,
.composer-form select {
  width: 100%;
  min-width: 0;
  padding: 11px 13px;
  border: 1px solid var(--line-strong);
  color: var(--ink);
  background: var(--paper-raised);
}
.composer-form textarea { min-height: 116px; resize: vertical; line-height: 1.55; }
.message-field { grid-row: span 2; }
.intent-field,
.requirement-field { display: grid; gap: 7px; min-width: 0; margin: 0; padding: 0; border: 0; }
.intent-field { grid-column: 1 / -1; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.intent-field legend,
.requirement-field legend { margin-bottom: 7px; color: var(--ink-soft); font-size: 0.82rem; font-weight: 700; }
.intent-field legend { grid-column: 1 / -1; }
.radio-choice {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-inner);
  background: var(--paper-raised);
  cursor: pointer;
}
.radio-choice:has(input:checked) { border-color: var(--water); background: var(--water-wash); }
.radio-choice input { width: 20px; min-height: 20px; margin: 0; accent-color: var(--water-deep); }
.radio-choice span,
.radio-choice strong,
.radio-choice small { display: block; min-width: 0; overflow-wrap: anywhere; }
.radio-choice strong { color: var(--ink); font-size: 0.8rem; }
.radio-choice small { margin-top: 2px; color: var(--ink-soft); font-size: 0.69rem; font-weight: 500; }
.responder-preview {
  display: grid;
  align-content: center;
  gap: 4px;
  min-width: 0;
  padding: 12px 14px;
  border-left: 4px solid var(--leaf);
  background: var(--leaf-wash);
}
.responder-preview small { color: var(--leaf-deep); font-size: 0.7rem; font-weight: 800; letter-spacing: 0.08em; }
.responder-preview strong,
.responder-preview span { overflow-wrap: anywhere; }
.responder-preview span { color: var(--ink-soft); font-size: 0.76rem; line-height: 1.5; }
.composer-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 11px; grid-column: 1 / -1; }
.send-status { flex: 1 1 260px; min-height: 1.5em; margin: 0; overflow-wrap: anywhere; color: var(--ink-soft); font-size: 0.78rem; }
.send-status[data-state="success"] { color: var(--leaf-deep); }
.send-status[data-state="error"] { color: var(--danger); }

.observatory-grid { display: grid; grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr); gap: 22px; align-items: start; }
.message-ledger,
.delivery-ledger,
.request-ledger,
.seat-roster,
.close-receipt { padding: 24px; border-radius: var(--radius-outer); }
.delivery-ledger { position: sticky; top: 18px; }
.panel-heading { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.count-label { color: var(--water-deep); font: 700 0.78rem ui-monospace, monospace; font-variant-numeric: tabular-nums; }

.event-list,
.delivery-list,
.seat-list,
.signal-trail ol { margin: 14px 0 0; padding: 0; list-style: none; }
.event-list { position: relative; display: grid; gap: 8px; }
.event-list::before { content: ""; position: absolute; z-index: 0; top: 22px; bottom: 22px; left: 24px; width: 2px; background: var(--water); opacity: 0.34; }
.event-list > li { min-width: 0; }
.event-entry { position: relative; z-index: 1; display: grid; grid-template-columns: 48px minmax(0, 1fr); gap: 12px; width: 100%; padding: 10px 12px 10px 0; border: 1px solid transparent; color: var(--ink); text-align: left; background: transparent; box-shadow: none; }
.event-entry:hover { box-shadow: none; background: var(--water-wash); }
.event-entry[data-selected="true"] { border-color: var(--water); background: var(--water-wash); transform: none; }
.cursor-mark { align-self: start; display: grid; place-items: center; width: 36px; min-height: 36px; margin: 1px 0 0 6px; border: 4px solid var(--paper); border-radius: 50%; color: var(--paper); background: var(--water-deep); font: 750 0.74rem ui-monospace, monospace; font-variant-numeric: tabular-nums; }
.event-copy { display: grid; min-width: 0; gap: 5px; }
.event-meta { color: var(--coral); font-size: 0.75rem; font-weight: 800; overflow-wrap: anywhere; }
.event-turn-target,
.event-causation { color: var(--water-deep); font-size: 0.72rem; overflow-wrap: anywhere; }
.event-body { display: -webkit-box; overflow: hidden; overflow-wrap: anywhere; line-height: 1.55; -webkit-box-orient: vertical; -webkit-line-clamp: 3; white-space: pre-wrap; }
.event-copy time { color: var(--ink-faint); font-size: 0.72rem; }

.selected-event { margin-top: 14px; padding: 14px; border-radius: var(--radius-inner); background: var(--leaf-wash); }
.selected-event p { margin-bottom: 0; overflow-wrap: anywhere; white-space: pre-wrap; }
.selected-event .selected-id { margin-bottom: 8px; color: var(--leaf-deep); font: 650 0.7rem ui-monospace, monospace; }
.selected-event .selected-causation { margin-bottom: 8px; color: var(--water-deep); font: 650 0.7rem ui-monospace, monospace; }
.selected-event .selected-requirement,
.selected-event .selected-turn-target { margin-bottom: 8px; color: var(--water-deep); font: 650 0.7rem ui-monospace, monospace; }
.empty-state { padding: 18px; color: var(--ink-soft); text-align: center; background: var(--leaf-wash); border-radius: var(--radius-inner); }

.delivery-list { display: grid; gap: 9px; }
.delivery-list li { min-width: 0; padding: 13px 14px; border: 1px solid var(--line); border-radius: var(--radius-inner); }
.delivery-list li > div:first-child { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.delivery-list li > div:first-child > strong { min-width: 0; max-width: 100%; overflow-wrap: anywhere; }
.delivery-list p { margin: 7px 0 0; overflow-wrap: anywhere; color: var(--ink-soft); font-size: 0.76rem; }
.delivery-id { font-family: ui-monospace, monospace; }
.delivery-bridge { display: grid; gap: 6px; margin-top: 11px; padding-top: 10px; border-top: 1px solid var(--line); }
.delivery-bridge p { margin: 0; }
.delivery-bridge .bridge-label { color: var(--ink); font-weight: 750; }
.attempt-list { display: grid; gap: 6px; margin: 0; padding: 0; list-style: none; }
.attempt-list li { display: grid; gap: 2px; padding: 7px 9px; border: 0; background: var(--water-wash); }
.attempt-list strong,
.attempt-list span { overflow-wrap: anywhere; font-size: 0.72rem; }
.attempt-list span { color: var(--ink-soft); font-family: ui-monospace, monospace; }
.delivery-status { padding: 4px 8px; border-radius: 999px; color: var(--ink-soft); background: var(--leaf-wash); font-size: 0.7rem; font-weight: 800; }
.delivery-status[data-status="client_received"] { color: var(--leaf-deep); background: var(--leaf-wash); }
.delivery-status[data-status="host_accepted"] { color: var(--leaf-deep); background: var(--leaf-wash); }
.delivery-status[data-status="pending"] { color: var(--water-deep); background: var(--water-wash); }
.delivery-status[data-status="failed"] { color: var(--danger); background: var(--danger-wash); }

.signal-trail { margin-top: 24px; }
.signal-trail ol { display: grid; gap: 0; }
.signal-trail li { position: relative; display: grid; gap: 3px; min-height: 58px; padding: 0 0 14px 28px; }
.signal-trail li::before { content: ""; position: absolute; top: 3px; left: 4px; width: 11px; height: 11px; border: 2px solid var(--paper); border-radius: 50%; background: var(--ink-faint); box-shadow: 0 0 0 1px var(--line-strong); }
.signal-trail li::after { content: ""; position: absolute; top: 17px; bottom: 0; left: 10px; width: 1px; background: var(--line-strong); }
.signal-trail li:last-child::after { display: none; }
.signal-trail li[data-status="reached"]::before { background: var(--leaf-deep); }
.signal-trail li[data-status="waiting"]::before { background: var(--water); }
.signal-trail li[data-status="recovery"]::before { background: var(--coral); }
.signal-trail li[data-status="terminal"]::before { background: var(--ink-soft); }
.signal-trail li[data-status="absent"] { color: var(--ink-soft); }
.signal-trail li strong { font-size: 0.82rem; }
.signal-trail li span { color: var(--ink-soft); font-size: 0.76rem; }

.request-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; margin: 14px 0 0; padding: 0; list-style: none; }
.request-entry { min-width: 0; padding: 14px; border: 1px solid var(--line); border-radius: var(--radius-inner); background: var(--paper-raised); }
.request-entry > div:first-child { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.request-entry strong,
.request-entry p,
.request-entry time { overflow-wrap: anywhere; }
.request-entry p { margin: 7px 0 0; color: var(--ink-soft); font-size: 0.74rem; }
.request-entry time { display: block; margin-top: 9px; color: var(--ink-faint); font-size: 0.7rem; }
.request-status { padding: 4px 8px; border-radius: 999px; color: var(--water-deep); background: var(--water-wash); font-size: 0.7rem; font-weight: 800; }
.request-status[data-status="satisfied"] { color: var(--leaf-deep); background: var(--leaf-wash); }
.request-status[data-status="cancelled"],
.request-status[data-status="expired"],
.request-status[data-status="stalled"] { color: var(--danger); background: var(--danger-wash); }
.request-entry .request-reply-button { margin-top: 12px; }
.request-entry .request-reply-note { color: var(--ink-soft); }

.lower-deck { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; align-items: start; }
.seat-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px; }
.seat-list li { min-width: 0; padding: 12px 14px; border-left: 3px solid var(--leaf); background: var(--leaf-wash); }
.seat-list strong,
.seat-list span { display: block; overflow-wrap: anywhere; }
.seat-list span { margin-top: 4px; color: var(--ink-soft); font-size: 0.74rem; }
.close-receipt { border-color: var(--coral); background: var(--paper-raised); }
.close-receipt dl { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 14px 0; }
.close-receipt dl div { min-width: 0; padding: 10px; background: var(--coral-wash); }
.close-receipt dt { color: var(--ink-soft); font-size: 0.72rem; }
.close-receipt dd { margin: 4px 0 0; overflow-wrap: anywhere; font-size: 0.84rem; font-weight: 700; }
.close-summary { margin-bottom: 0; color: var(--ink-soft); }
.close-export-actions { display: grid; gap: 12px; margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line); }
.close-export-copy { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 6px 16px; }
.close-export-copy h3,
.close-export-copy p { margin: 0; }
.close-export-copy p { max-width: 34ch; color: var(--ink-soft); font-size: 0.76rem; }
.close-export-controls { display: flex; flex-wrap: wrap; gap: 9px; }
.close-export-controls button { flex: 1 1 160px; }
.export-status { min-height: 1.5em; margin: 0; overflow-wrap: anywhere; color: var(--ink-soft); font-size: 0.76rem; }
.export-status[data-state="success"] { color: var(--leaf-deep); }
.export-status[data-state="error"] { color: var(--danger); }

footer { padding: 24px 0 56px; color: var(--ink-soft); font-size: 0.8rem; }
footer p { margin-bottom: 0; }
noscript { display: block; padding: 20px; background: var(--danger-wash); }

@media (max-width: 900px) {
  .connection-desk,
  .room-strip,
  .composer,
  .observatory-grid { grid-template-columns: 1fr; }
  .connection-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .composer-form { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .delivery-ledger { position: static; }
}

@media (max-width: 620px) {
  .masthead,
  main,
  footer { width: min(100% - 20px, 1180px); }
  .masthead { align-items: stretch; padding-top: 32px; }
  .signal-lantern { min-width: 0; }
  .connection-desk,
  .room-strip,
  .composer,
  .message-ledger,
  .delivery-ledger,
  .request-ledger,
  .seat-roster,
  .close-receipt { padding: 18px; border-radius: 20px; }
  .connection-form,
  .composer-form,
  .intent-field,
  .room-facts,
  .request-list,
  .lower-deck,
  .seat-list,
  .close-receipt dl { grid-template-columns: 1fr; }
  .form-actions button { flex: 1 1 100%; }
  .message-field { grid-row: auto; }
  .composer-actions button { flex: 1 1 100%; }
  .event-entry { grid-template-columns: 42px minmax(0, 1fr); }
  .event-list::before { left: 21px; }
  .cursor-mark { width: 32px; min-height: 32px; margin-left: 5px; }
}

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