:root {
  color-scheme: light;
  --ink: #51475a;
  --muted: #918697;
  --purple: #76618a;
  --purple-dark: #594766;
  --lavender: #eee6f4;
  --paper: rgba(255, 255, 255, .86);
  --line: rgba(103, 78, 119, .12);
  --shadow: 0 18px 50px rgba(71, 52, 84, .09);
  font-family: Inter, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  min-width: 280px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 3%, rgba(226, 212, 239, .92), transparent 30%),
    radial-gradient(circle at 92% 24%, rgba(233, 221, 238, .58), transparent 25%),
    linear-gradient(180deg, #fbf9fc, #f2edf6);
}

button,
textarea,
input { font: inherit; }

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

button { cursor: pointer; }

.collaboration-shell {
  width: min(100%, 820px);
  margin: 0 auto;
  padding: max(22px, env(safe-area-inset-top)) 16px calc(42px + env(safe-area-inset-bottom));
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.page-header p,
.section-heading p,
.eyebrow,
.room-header p,
.summary-card > p {
  margin: 0 0 5px;
  color: #998ba2;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .16em;
}

.page-header h1 {
  margin: 0;
  font-family: "Songti SC", "STSong", serif;
  font-size: clamp(28px, 8vw, 38px);
  font-weight: 600;
  letter-spacing: .1em;
}

.page-header a {
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--purple);
  background: rgba(255, 255, 255, .62);
  font-size: 11px;
  text-decoration: none;
}

.intro-card,
.create-card,
.room-card {
  border: 1px solid rgba(255, 255, 255, .9);
  border-radius: 28px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.intro-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 20px;
  padding: 22px;
  background: linear-gradient(145deg, rgba(255,255,255,.88), rgba(235,225,242,.9));
}

.intro-card h2,
.section-heading h2,
.room-header h2 {
  margin: 0;
  font-family: "Songti SC", "STSong", serif;
  font-weight: 600;
}

.intro-card h2 { font-size: clamp(19px, 5vw, 25px); }
.intro-card div > p:last-child { margin: 9px 0 0; color: var(--muted); font-size: 12px; line-height: 1.7; }

.roundtable-mark {
  position: relative;
  display: grid;
  width: 112px;
  height: 112px;
  place-items: center;
  border-radius: 50%;
  background: rgba(255,255,255,.6);
  box-shadow: inset 0 0 0 12px rgba(130,102,149,.08);
}

.roundtable-mark i {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: linear-gradient(145deg, #b7a3c4, #7a638c);
  box-shadow: 0 8px 20px rgba(85,65,98,.18);
}

.roundtable-mark span {
  position: absolute;
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  border: 2px solid white;
  border-radius: 50%;
  color: white;
  background: #725c84;
  font-size: 10px;
  font-weight: 700;
}

.roundtable-mark span:first-child { top: 4px; left: 11px; }
.roundtable-mark span:last-child { right: 6px; bottom: 9px; background: #80949a; }

.create-card,
.room-card { margin-top: 18px; padding: 20px; }

.section-heading,
.room-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
}

.section-heading { margin-bottom: 17px; }
.section-heading h2,
.room-header h2 { font-size: 21px; }
.section-heading > span { color: #a093a7; font-size: 10px; letter-spacing: .12em; }

form > label,
fieldset legend {
  display: block;
  margin-bottom: 8px;
  color: #766a7c;
  font-size: 11px;
  font-weight: 600;
}

textarea {
  width: 100%;
  min-height: 86px;
  padding: 13px 14px;
  resize: vertical;
  border: 1px solid rgba(109,84,124,.16);
  border-radius: 16px;
  outline: none;
  color: var(--ink);
  background: rgba(255,255,255,.92);
  line-height: 1.6;
}

textarea:focus {
  border-color: #9278a5;
  box-shadow: 0 0 0 3px rgba(146,120,165,.1);
}

fieldset {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin: 17px 0;
  padding: 0;
  border: 0;
}

fieldset legend { grid-column: 1 / -1; }
.agent-card { display:grid; min-width:0; border:1px solid var(--line); border-radius:16px; overflow:hidden; background:rgba(248,245,250,.8); }

.agent-option {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px;
  border: 0;
  border-radius: 0;
  background: transparent;
  cursor: pointer;
}

.agent-option:has(input:checked) {
  background: var(--lavender);
}
.agent-card > button { min-height:34px; border:0; border-top:1px solid var(--line); color:var(--purple); background:rgba(255,255,255,.66); font-size:10px; }

.agent-option input { position: absolute; opacity: 0; pointer-events: none; }
.agent-option strong,
.agent-option small { display: block; }
.agent-option strong { font-size: 12px; }
.agent-option small { margin-top: 2px; color: var(--muted); font-size: 9px; }

.agent-avatar,
.participant-avatar {
  display: grid;
  flex: 0 0 auto;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: linear-gradient(145deg, #9178a9, #554365);
  font-size: 10px;
  font-weight: 700;
}

.agent-option--gpt .agent-avatar,
.participant-avatar--chatgpt { background: linear-gradient(145deg, #9aabad, #61777a); }

.primary-button,
.secondary-button {
  min-height: 44px;
  padding: 0 17px;
  border-radius: 14px;
  font-weight: 600;
}

.primary-button {
  border: 0;
  color: white;
  background: linear-gradient(145deg, #89709e, #604c70);
}

form > .primary-button { width: 100%; }
.primary-button:disabled { cursor: not-allowed; opacity: .45; }

.secondary-button {
  border: 1px solid rgba(112,87,126,.18);
  color: var(--purple);
  background: #f4eef7;
}

.form-status { min-height: 17px; margin: 8px 0 0; color: #9b6470; font-size: 11px; text-align: center; }
.room-status { min-height: 17px; margin: 8px 0 0; color: #8b718c; font-size: 11px; text-align: center; }
.room-status.is-error { color: #9b6470; }

.room-header { align-items: center; }
.room-header > div:first-child { min-width: 0; }
.room-header h2 { overflow-wrap: anywhere; }

.participant-stack { display: flex; flex-direction: row-reverse; padding-left: 12px; }
.participant-stack .participant-avatar { margin-left: -9px; border: 2px solid white; }

.room-context {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin: 17px 0;
}

.room-context span {
  padding: 5px 9px;
  border-radius: 999px;
  color: #887990;
  background: #f2ecf5;
  font-size: 9px;
}

.message-list { display: grid; gap: 12px; }

.message {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 9px;
  align-items: start;
}

.message--chatgpt { grid-template-columns: minmax(0, 1fr) 34px; }
.message--chatgpt .message__avatar { grid-column: 2; }
.message--chatgpt .message__body { grid-column: 1; grid-row: 1; justify-self: end; background: #edf2f1; }

.message__avatar {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  border-radius: 50%;
  color: white;
  background: #725c84;
  font-size: 9px;
  font-weight: 700;
}

.message--chatgpt .message__avatar { background: #6f8588; }

.message__body {
  width: fit-content;
  max-width: min(88%, 560px);
  padding: 10px 12px;
  border-radius: 6px 16px 16px;
  background: #f1eaf5;
}

.message__body strong { display: block; margin-bottom: 4px; font-size: 10px; }
.message__body p { margin: 0; color: #685d6d; font-size: 12px; line-height: 1.65; overflow-wrap: anywhere; }

.empty-room {
  display: grid;
  min-height: 150px;
  place-items: center;
  align-content: center;
  color: var(--muted);
  text-align: center;
}

.empty-room span { font-size: 38px; opacity: .42; }
.empty-room p { margin: 8px 0 0; font-size: 11px; }

.room-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 9px;
  margin-top: 18px;
}

.summary-card {
  margin-top: 16px;
  padding: 15px;
  border: 1px solid rgba(111,88,126,.12);
  border-radius: 18px;
  background: linear-gradient(145deg, #f6f0f8, #fff);
}

.summary-card h3 { margin: 0 0 8px; font-family: "Songti SC", "STSong", serif; font-size: 17px; }
.summary-card div { color: #706477; font-size: 12px; line-height: 1.7; }

[hidden] { display: none !important; }

@media (max-width: 560px) {
  .intro-card { grid-template-columns: 1fr; }
  .roundtable-mark { width: 96px; height: 96px; }
  .room-actions { grid-template-columns: 1fr; }
}

@media (max-width: 359px) {
  .collaboration-shell { padding-right: 11px; padding-left: 11px; }
  .page-header { align-items: center; }
  .page-header a { padding: 7px 9px; }
  .intro-card,
  .create-card,
  .room-card { border-radius: 22px; }
  fieldset { grid-template-columns: 1fr; }
}