* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.55;
  color: #1e2233;
  background:
    radial-gradient(1200px 600px at 15% -10%, #e7e2ff 0%, rgba(231, 226, 255, 0) 60%),
    radial-gradient(1000px 500px at 100% 0%, #d9f2f4 0%, rgba(217, 242, 244, 0) 55%),
    #f4f5fb;
  background-attachment: fixed;
  padding: 24px;
}

.container {
  max-width: 980px;
  margin: 0 auto;
}

h1 {
  font-size: 1.6rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: #241b4d;
}

h2 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #6b5fa8;
  margin-bottom: 14px;
}

p {
  color: #5b6178;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85em;
}

/* Header */

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  padding: 0 4px;
}

.eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #7c6fd6;
  margin-bottom: 6px;
}

.hub-url {
  font-size: 0.86rem;
  margin-top: 6px;
  max-width: 56ch;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.role-badge {
  display: none;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #fff;
  background: #94a3b8;
}

.role-badge.teacher { background: #4f46e5; }
.role-badge.student { background: #0d9488; }
.role-badge.guest { background: #64748b; }

.conn-badge {
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #475569;
  background: #e2e8f0;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

.conn-badge[data-state="connecting"] { color: #92400e; background: #fef3c7; }
.conn-badge[data-state="connected"] { color: #065f46; background: #d1fae5; }
.conn-badge[data-state="closed"] { color: #991b1b; background: #fee2e2; }

/* Panels */

.panel {
  background: #fff;
  border-radius: 14px;
  border: 1px solid rgba(124, 111, 214, 0.12);
  box-shadow: 0 10px 28px -18px rgba(46, 33, 102, 0.45), 0 1px 2px rgba(46, 33, 102, 0.05);
  padding: 22px 24px;
  margin-bottom: 18px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-head h2 {
  margin-bottom: 0;
}

/* Forms */

.params {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 0.78rem;
  font-weight: 600;
  color: #52606d;
}

input,
select,
textarea {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 400;
  color: #1f2933;
  padding: 7px 10px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  background: #fff;
  width: 100%;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: #6d5ce0;
  box-shadow: 0 0 0 3px rgba(109, 92, 224, 0.18);
}

.form-actions {
  display: flex;
  gap: 8px;
  margin-top: 4px;
}

.params .form-actions {
  grid-column: 1 / -1;
}

.btn {
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 8px 16px;
  border: 1px solid #cbd5e1;
  border-radius: 6px;
  background: #fff;
  color: #334155;
  cursor: pointer;
}

.btn:hover { background: #f1f5f9; }

.btn.primary {
  background: linear-gradient(135deg, #5b4bd6, #7d6cf0);
  border-color: #5b4bd6;
  color: #fff;
  box-shadow: 0 6px 16px -8px rgba(91, 75, 214, 0.9);
}

.btn.primary:hover { background: linear-gradient(135deg, #4d3ec4, #6d5ce0); }

.btn.small {
  padding: 4px 10px;
  font-size: 0.75rem;
}

/* Network test steps */

.steps {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}

.step {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid #e2e8f0;
  font-size: 0.8rem;
  color: #64748b;
  background: #f8fafc;
}

.step .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #cbd5e1;
}

.step.skip {
  display: none;
}

.step.busy {
  border-color: #fcd34d;
  color: #92400e;
  background: #fffbeb;
}

.step.busy .dot {
  background: #f59e0b;
  animation: pulse 1s ease-in-out infinite;
}

.step.ok {
  border-color: #a7f3d0;
  color: #065f46;
  background: #ecfdf5;
}

.step.ok .dot { background: #10b981; }

.step.err {
  border-color: #fecaca;
  color: #991b1b;
  background: #fef2f2;
}

.step.err .dot { background: #ef4444; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.ping-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.ping-result {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.82rem;
  color: #475569;
}

/* Identity card */

.identity-card {
  display: none;
}

.identity-card dl {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.identity-card dt {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #94a3b8;
}

.identity-card dd {
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

/* Message log */

.log-wrap {
  margin-top: 12px;
  max-height: 340px;
  overflow-y: auto;
  background: #0f172a;
  border-radius: 6px;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.78rem;
  line-height: 1.6;
}

.log-row {
  display: flex;
  gap: 10px;
  padding: 1px 0;
}

.log-ts {
  flex: none;
  color: #475569;
}

.log-dir {
  flex: none;
  width: 1em;
  text-align: center;
}

.log-dir.in { color: #7dd3fc; }
.log-dir.out { color: #fbbf24; }
.log-dir.err { color: #f87171; }
.log-dir.info { color: #64748b; }

.log-body {
  color: #e2e8f0;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.log-row:has(.log-dir.err) .log-body { color: #fca5a5; }

/* Composer */

.composer-row {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.composer-row label {
  flex: 1 1 180px;
}

.payload-label {
  margin-top: 14px;
}

textarea {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  resize: vertical;
}

.composer .form-actions {
  margin-top: 12px;
}

/* Error screen */

.error-screen {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(15, 23, 42, 0.92);
}

.error-box {
  max-width: 640px;
  width: 100%;
  background: #1e293b;
  color: #e2e8f0;
  border-radius: 10px;
  padding: 28px 32px;
}

.error-icon {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: #7f1d1d;
  color: #fecaca;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  margin-bottom: 14px;
}

.error-box h2 {
  font-size: 1.1rem;
  text-transform: none;
  letter-spacing: 0;
  color: #fecaca;
  margin-bottom: 8px;
}

.error-box p {
  color: #cbd5e1;
  font-size: 0.9rem;
}

#err-detail {
  display: none;
  margin-top: 14px;
  padding: 12px;
  max-height: 260px;
  overflow: auto;
  background: #0f172a;
  border-radius: 6px;
  font-size: 0.78rem;
  color: #e2e8f0;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.error-box .btn {
  margin-top: 18px;
  background: #334155;
  border-color: #334155;
  color: #fff;
}

.error-box .btn:hover {
  background: #475569;
}

/* Chatbot */

.chat-head-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.chat-status {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.78rem;
  color: #475569;
}

.chat-wrap {
  margin-top: 12px;
  max-height: 420px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px;
}

.chat-empty {
  color: #94a3b8;
  font-size: 0.85rem;
}

.msg {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-width: 80%;
}

.msg.user {
  align-self: flex-end;
  align-items: flex-end;
}

.msg.assistant {
  align-self: flex-start;
}

.msg-who {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #94a3b8;
}

.msg-body {
  padding: 9px 12px;
  border-radius: 10px;
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.msg.user .msg-body,
.msg.error .msg-body,
.msg-body.error {
  white-space: pre-wrap;
}

/* Rendered markdown inside assistant bubbles */

.msg-body.md > :first-child { margin-top: 0; }
.msg-body.md > :last-child { margin-bottom: 0; }

.msg-body.md p {
  color: inherit;
  margin: 0 0 0.6em;
}

.msg-body.md ul,
.msg-body.md ol {
  margin: 0 0 0.6em;
  padding-left: 1.4em;
}

.msg-body.md li + li { margin-top: 0.2em; }

.msg-body.md h1,
.msg-body.md h2,
.msg-body.md h3,
.msg-body.md h4 {
  font-size: 0.95rem;
  text-transform: none;
  letter-spacing: 0;
  color: inherit;
  margin: 0.8em 0 0.4em;
}

.msg-body.md pre {
  margin: 0 0 0.6em;
  padding: 10px 12px;
  overflow-x: auto;
  background: #0f172a;
  color: #e2e8f0;
  border-radius: 6px;
}

.msg-body.md code {
  background: rgba(15, 23, 42, 0.08);
  padding: 1px 4px;
  border-radius: 4px;
}

.msg-body.md pre code {
  background: none;
  padding: 0;
  font-size: 0.8rem;
}

.msg-body.md blockquote {
  margin: 0 0 0.6em;
  padding-left: 10px;
  border-left: 3px solid #cbd5e1;
  color: #475569;
}

.msg-body.md a { color: #5b4bd6; }

.msg-body.md table {
  display: block;
  overflow-x: auto;
  border-collapse: collapse;
  margin: 0 0 0.6em;
}

.msg-body.md th,
.msg-body.md td {
  border: 1px solid #cbd5e1;
  padding: 4px 8px;
}

.msg.user .msg-body {
  background: linear-gradient(135deg, #5b4bd6, #7d6cf0);
  color: #fff;
  border-bottom-right-radius: 3px;
}

.msg.assistant .msg-body {
  background: #f3f1fd;
  color: #241b4d;
  border-bottom-left-radius: 3px;
}

.msg.error .msg-body {
  background: #fef2f2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.msg.streaming .msg-body::after {
  content: '▋';
  margin-left: 2px;
  animation: pulse 1s steps(2) infinite;
}

.system-wrap {
  margin-top: 14px;
}

.chat-composer {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  align-items: flex-end;
}

.chat-composer textarea {
  flex: 1;
}

.chat-hint {
  font-size: 0.72rem;
  color: #94a3b8;
  margin-top: 6px;
}

@media (max-width: 640px) {
  body { padding: 12px; }
  .params { grid-template-columns: 1fr; }
  .panel { padding: 16px; }
}

/* Tutor app */

.tutor-layout {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(240px, 1fr);
  gap: 18px;
  align-items: start;
}

/* Intro card */

.intro-card {
  background: linear-gradient(135deg, #2b1e5c 0%, #4a3aa8 60%, #6d5ce0 100%);
  color: #eceaff;
  border-radius: 16px;
  padding: 22px 24px;
  margin-bottom: 18px;
  box-shadow: 0 16px 36px -20px rgba(43, 30, 92, 0.95);
}

.intro-card h2 {
  color: #cdc6ff;
}

.intro-main p {
  color: #ded9ff;
  font-size: 0.9rem;
  max-width: 74ch;
}

.intro-main strong {
  color: #fff;
}

.intro-topics {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 16px 0 0;
  padding: 0;
}

.intro-topics li {
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 5px 12px;
  border-radius: 999px;
  color: #efeaff;
  background: rgba(255, 255, 255, 0.13);
  border: 1px solid rgba(255, 255, 255, 0.22);
}

/* Tips */

.tips-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.tips-list li {
  position: relative;
  padding-left: 24px;
  font-size: 0.85rem;
  color: #5b6178;
}

.tips-list li::before {
  content: '◆';
  position: absolute;
  left: 4px;
  top: 0;
  color: #7d6cf0;
  font-size: 0.7rem;
}

.tips-list strong {
  color: #241b4d;
}

.objective-list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.objective {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 11px 13px;
  border: 1px solid #e6e3f5;
  border-radius: 10px;
  background: #fbfaff;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.objective-box {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid #cfc9ee;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
}

.objective strong {
  display: block;
  font-size: 0.88rem;
  color: #241b4d;
}

.objective p {
  margin: 3px 0 0;
  font-size: 0.8rem;
  color: #5b6178;
}

.objective.done {
  border-color: #9ce0d4;
  background: #effcf9;
}

.objective.done .objective-box {
  background: #0d9488;
  border-color: #0d9488;
}

.student-list {
  margin-top: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.student-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) auto auto;
  gap: 12px;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.student-row:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

.student-name {
  font-weight: 600;
  font-size: 0.88rem;
}

.student-progress {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: #475569;
}

.student-progress.complete {
  color: #0d9488;
}

.student-meta {
  font-size: 0.75rem;
  color: #94a3b8;
}

.transcript-panel {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid #e2e8f0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (max-width: 860px) {
  .tutor-layout { grid-template-columns: 1fr; }
}