:root {
  color-scheme: light;
  --thorium-oxblood: #110505;
  --thorium-black: #000000;
  --thorium-white: #ffffff;
  --thorium-ink: #171313;
  --thorium-muted: #665f5f;
  --thorium-line: #d9d4d4;
  --thorium-surface: #f7f5f5;
  --thorium-error: #a52222;
  --thorium-focus: #8f6666;
  --thorium-space: 8px;
  --thorium-font: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }
body { margin: 0; background: var(--thorium-white); color: var(--thorium-ink); font: 16px/1.6 var(--thorium-font); }
button, textarea { font: inherit; }
button, a, textarea { outline: none; }
button:focus-visible, a:focus-visible, textarea:focus-visible { box-shadow: 0 0 0 3px var(--thorium-white), 0 0 0 6px var(--thorium-focus); }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 3px; }

.shell { min-height: 100vh; display: grid; grid-template-columns: 304px minmax(0, 1fr); }
.rail { display: flex; flex-direction: column; padding: calc(var(--thorium-space) * 3); background: var(--thorium-oxblood); color: var(--thorium-white); }
.brand { display: flex; align-items: center; gap: calc(var(--thorium-space) * 2); margin-bottom: calc(var(--thorium-space) * 2); }
.brand-logo { width: 72px; height: 72px; flex: 0 0 auto; object-fit: contain; }
.brand h1 { margin: 0; max-width: 150px; font-size: 21px; line-height: 1.18; letter-spacing: -.01em; }
.signed { margin: 0 0 calc(var(--thorium-space) * 3); color: #d8cece; font-size: 13px; }
.signed strong { color: var(--thorium-white); font-weight: 700; }
.advisor-list { display: grid; gap: var(--thorium-space); }
.advisor-list .advisor { position: relative; width: 100%; min-height: 104px; padding: 15px 16px; border: 1px solid #4c3a3a; border-radius: 8px; background: transparent; color: var(--thorium-white); cursor: pointer; text-align: left; transition: background-color .15s ease, border-color .15s ease; }
.advisor-list .advisor:hover { background: #281717; border-color: #8f7777; }
.advisor-list .advisor.active { padding-left: 20px; background: var(--thorium-white); border-color: var(--thorium-white); color: var(--thorium-black); }
.advisor-list .advisor.active::before { position: absolute; inset: 0 auto 0 0; width: 6px; background: var(--thorium-oxblood); content: ""; }
.advisor-list .advisor strong { display: block; font-size: 17px; line-height: 1.3; }
.advisor-list .advisor span { display: block; margin-top: 3px; color: #d8cece; font-size: 13px; line-height: 1.35; }
.advisor-list .advisor.active span { color: var(--thorium-muted); }
.advisor-list .advisor .ai { margin-top: var(--thorium-space); color: var(--thorium-white); font-size: 12px; font-weight: 600; letter-spacing: .04em; }
.advisor-list .advisor.active .ai { color: var(--thorium-oxblood); }
.advisor-list .advisor .selected-label { display: none; }
.advisor-list .advisor.active .selected-label { display: inline; }
.rail-footer { margin: auto 0 0; padding-top: calc(var(--thorium-space) * 3); color: #d8cece; font-size: 12px; }
.rail-footer a { color: var(--thorium-white); }

.main { min-width: 0; max-height: 100vh; display: flex; flex-direction: column; background: var(--thorium-white); }
.top { display: flex; align-items: center; justify-content: space-between; gap: calc(var(--thorium-space) * 2); padding: calc(var(--thorium-space) * 3) calc(var(--thorium-space) * 4); border-bottom: 1px solid var(--thorium-line); }
.top h2 { margin: 0; color: var(--thorium-black); font-size: 24px; line-height: 1.25; letter-spacing: -.02em; }
.top p { margin: 4px 0 0; color: var(--thorium-muted); font-size: 13px; }
.new, .voice { border: 1px solid var(--thorium-oxblood); border-radius: 6px; background: var(--thorium-white); color: var(--thorium-oxblood); font-weight: 600; cursor: pointer; }
.new { flex: 0 0 auto; padding: 9px 14px; }
.new:hover, .voice:hover { background: var(--thorium-surface); }
.messages { flex: 1; overflow: auto; padding: calc(var(--thorium-space) * 4); display: flex; flex-direction: column; gap: calc(var(--thorium-space) * 3); }
.empty { margin: auto; max-width: 640px; padding: calc(var(--thorium-space) * 4); text-align: center; color: var(--thorium-muted); }
.empty strong { display: block; margin-bottom: var(--thorium-space); color: var(--thorium-black); font-size: 32px; line-height: 1.25; letter-spacing: -.025em; }
.message { width: min(100%, 780px); padding: 2px 0 2px 18px; border-left: 3px solid var(--thorium-line); white-space: pre-wrap; overflow-wrap: anywhere; }
.message.user { width: min(88%, 720px); align-self: flex-end; padding: 12px 16px; border: 0; border-radius: 6px; background: var(--thorium-surface); }
.message.advisor { align-self: flex-start; border-left-color: var(--thorium-oxblood); color: var(--thorium-ink); }
.message .who { display: block; margin-bottom: 6px; color: var(--thorium-muted); font-size: 13px; font-weight: 600; }
.message.error { border-left-color: var(--thorium-error); color: var(--thorium-error); }
.composer { padding: calc(var(--thorium-space) * 2) calc(var(--thorium-space) * 4) calc(var(--thorium-space) * 3); border-top: 1px solid var(--thorium-line); background: var(--thorium-white); }
.compose-label { display: block; max-width: 980px; margin: 0 auto 6px; color: var(--thorium-black); font-size: 13px; font-weight: 600; }
.compose-row { display: flex; gap: var(--thorium-space); max-width: 980px; margin: auto; }
.composer textarea { flex: 1; min-height: 72px; max-height: 184px; padding: 12px 14px; resize: vertical; border: 1px solid #817878; border-radius: 6px; background: var(--thorium-white); color: var(--thorium-black); }
.composer textarea:focus { border-color: var(--thorium-oxblood); }
.send { align-self: stretch; min-width: 96px; padding: 0 20px; border: 1px solid var(--thorium-oxblood); border-radius: 6px; background: var(--thorium-oxblood); color: var(--thorium-white); font-weight: 600; cursor: pointer; }
.send:hover { background: var(--thorium-black); border-color: var(--thorium-black); }
.send:disabled { background: #a69f9f; border-color: #a69f9f; cursor: not-allowed; }
.channel { max-width: 980px; margin: var(--thorium-space) auto 0; color: var(--thorium-muted); font-size: 13px; }
.voice { display: none; margin-left: var(--thorium-space); padding: 5px 9px; }
.voice.available { display: inline-block; }

.sign-in { min-height: 100vh; display: grid; place-items: center; padding: calc(var(--thorium-space) * 3); background: var(--thorium-surface); }
.sign-in-card { width: min(100%, 460px); overflow: hidden; border: 1px solid var(--thorium-line); border-radius: 8px; background: var(--thorium-white); }
.sign-in-brand { display: flex; align-items: center; gap: calc(var(--thorium-space) * 2); padding: calc(var(--thorium-space) * 3); background: var(--thorium-oxblood); color: var(--thorium-white); }
.sign-in-brand .brand-logo { width: 88px; height: 88px; }
.sign-in-content { padding: calc(var(--thorium-space) * 4); }
.sign-in-content h1 { margin: 0 0 var(--thorium-space); color: var(--thorium-black); font-size: 32px; line-height: 1.25; }
.sign-in-content p { margin: 0 0 calc(var(--thorium-space) * 3); color: var(--thorium-muted); }
.sign-in-button { display: inline-block; padding: 11px 16px; border-radius: 6px; background: var(--thorium-oxblood); color: var(--thorium-white); font-weight: 600; text-decoration: none; }
.sign-in-button:hover { background: var(--thorium-black); }

@media (max-width: 920px) {
  .shell { grid-template-columns: 256px minmax(0, 1fr); }
  .rail { padding: calc(var(--thorium-space) * 2); }
  .brand-logo { width: 60px; height: 60px; }
  .brand h1 { font-size: 18px; }
  .top, .messages { padding-left: calc(var(--thorium-space) * 3); padding-right: calc(var(--thorium-space) * 3); }
  .composer { padding-left: calc(var(--thorium-space) * 3); padding-right: calc(var(--thorium-space) * 3); }
}

@media (max-width: 680px) {
  .shell { display: block; }
  .rail { min-height: auto; padding: calc(var(--thorium-space) * 2); }
  .brand { margin-bottom: var(--thorium-space); }
  .brand-logo { width: 56px; height: 56px; }
  .signed { margin-bottom: calc(var(--thorium-space) * 2); }
  .advisor-list { grid-template-columns: 1fr 1fr; }
  .advisor-list .advisor { min-height: 112px; padding: 12px; }
  .advisor-list .advisor.active { padding-left: 16px; }
  .rail-footer { display: none; }
  .main { min-height: 70vh; max-height: none; }
  .top { align-items: flex-start; padding: calc(var(--thorium-space) * 2); }
  .top h2 { font-size: 21px; }
  .new { padding: 8px 10px; }
  .messages { min-height: 44vh; padding: calc(var(--thorium-space) * 2); }
  .empty { padding: calc(var(--thorium-space) * 2); }
  .empty strong { font-size: 26px; }
  .message.user { width: 94%; }
  .composer { padding: calc(var(--thorium-space) * 2); }
  .compose-row { display: grid; }
  .send { min-height: 48px; }
  .channel { line-height: 1.8; }
}

@media (max-width: 390px) {
  .brand h1 { font-size: 17px; }
  .advisor-list { grid-template-columns: 1fr; }
  .advisor-list .advisor { min-height: auto; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}