:root {
  --bg: #0c1118;
  --panel: #111a24;
  --panel-2: #172331;
  --panel-3: #1d2b3a;
  --ink: #f4f0e8;
  --muted: #a9b3bf;
  --faint: #6f7b88;
  --line: rgba(255, 255, 255, 0.1);
  --gold: #c5a365;
  --gold-2: #ead6a8;
  --blue: #7ea7d8;
  --green: #7fb69b;
  --danger: #f3a29d;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.36);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.035), transparent 320px),
    radial-gradient(circle at top right, rgba(197,163,101,0.08), transparent 360px),
    var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
}

h1, h2, p { margin: 0; }

.topbar {
  height: 88px;
  padding: 18px 32px;
  border-bottom: 1px solid var(--line);
  background: rgba(12, 17, 24, 0.88);
  backdrop-filter: blur(18px);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.eyebrow {
  color: var(--gold);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-weight: 700;
}

h1 {
  margin-top: 3px;
  font-size: 28px;
  color: var(--ink);
  letter-spacing: 0;
}

h2 {
  font-size: 12px;
  color: var(--faint);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.workspace {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  min-height: calc(100vh - 88px);
}

.sidebar {
  border-right: 1px solid var(--line);
  background: rgba(17, 26, 36, 0.72);
  padding: 26px;
}

.sidebar button,
.ghost,
.composer button,
.login-panel button {
  border: 0;
  cursor: pointer;
  font: inherit;
}

.sidebar button {
  width: 100%;
  margin-top: 12px;
  padding: 13px 14px;
  background: var(--panel-2);
  color: var(--ink);
  border: 1px solid var(--line);
  text-align: left;
  border-radius: 6px;
  line-height: 1.35;
}

.sidebar button:hover {
  border-color: rgba(197, 163, 101, 0.55);
  background: var(--panel-3);
}

.ghost {
  padding: 10px 14px;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 6px;
}

.ghost:hover {
  color: var(--ink);
  border-color: rgba(255, 255, 255, 0.24);
}

.chat-shell {
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  min-height: calc(100vh - 88px);
}

.messages {
  overflow-y: auto;
  padding: 32px;
}

.message {
  max-width: 900px;
  margin-bottom: 20px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(17, 26, 36, 0.92);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.16);
  line-height: 1.62;
}

.message.user {
  max-width: 760px;
  margin-left: auto;
  background: #203047;
  border-color: rgba(126, 167, 216, 0.25);
}

.message-label {
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.message.user .message-label { color: var(--blue); }

.message-body {
  color: var(--ink);
  white-space: pre-wrap;
}

.message-body h3 {
  margin: 18px 0 8px;
  color: var(--gold-2);
  font-size: 18px;
  line-height: 1.3;
}

.message-body h3:first-child { margin-top: 0; }

.message-body p {
  margin: 0 0 13px;
}

.message-body ul,
.message-body ol {
  margin: 8px 0 16px 22px;
  padding: 0;
}

.message-body li {
  margin: 7px 0;
  padding-left: 4px;
}

.message-body strong { color: #fff8e8; }
.message-body em { color: var(--gold-2); }

.composer {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 104px;
  gap: 12px;
  padding: 20px 32px;
  background: rgba(12, 17, 24, 0.94);
  border-top: 1px solid var(--line);
}

textarea,
input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 13px 14px;
  background: #0f1721;
  color: var(--ink);
  font: inherit;
  outline: none;
}

textarea:focus,
input:focus {
  border-color: rgba(197, 163, 101, 0.7);
  box-shadow: 0 0 0 3px rgba(197, 163, 101, 0.12);
}

textarea::placeholder,
input::placeholder { color: var(--faint); }

.composer button,
.login-panel button {
  border-radius: 6px;
  background: var(--gold);
  color: #10151d;
  font-weight: 800;
}

.composer button:disabled {
  opacity: 0.62;
  cursor: wait;
}

.login-page {
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(460px, 100%);
  padding: 34px;
  background: rgba(17, 26, 36, 0.94);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.brand-mark {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  border-radius: 6px;
  background: #0f1721;
  border: 1px solid rgba(197, 163, 101, 0.45);
  color: var(--gold-2);
  font-weight: 800;
}

.login-panel p {
  margin-top: 10px;
  color: var(--muted);
  line-height: 1.5;
}

.login-panel form {
  display: grid;
  gap: 15px;
  margin-top: 24px;
}

.login-panel label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 14px;
}

.login-panel button {
  padding: 13px;
}

.error {
  margin-top: 16px;
  padding: 11px;
  border-radius: 6px;
  background: rgba(243, 162, 157, 0.12);
  border: 1px solid rgba(243, 162, 157, 0.35);
  color: var(--danger);
}

@media (max-width: 860px) {
  .topbar { padding: 16px 20px; }
  .workspace { grid-template-columns: 1fr; }
  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
    padding: 18px 20px;
  }
  .messages { padding: 20px; }
  .composer {
    grid-template-columns: 1fr;
    padding: 16px 20px;
  }
}