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

:root {
  --nephila-blue: #00709E;
  --nephila-accent: #E60036;
  --nephila-accent-light: #FF4D77;
  --nephila-light: #F5F5F5;
  --correct: #16a34a;
  --wrong: #E60036;
  --jailbreak: #7c3aed;
  --surface: #ffffff;
  --text: #222222;
  --muted: #555555;
  --border: #dddddd;
  --radius: 10px;
  --font-sans: "Lato", system-ui, -apple-system, sans-serif;
  --font-slab: "Roboto Slab", Georgia, serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Cascadia Code", monospace;
}

body {
  font-family: var(--font-sans);
  font-weight: 300;
  font-size: 15px;
  background: var(--nephila-light);
  color: var(--text);
  height: 100dvh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Header ── */
header {
  background: var(--nephila-blue);
  color: #fff;
  padding: 12px 32px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0;
}
.header-logo {
  height: 36px;
  width: auto;
  object-fit: contain;
  filter: brightness(0) invert(1);
}
.header-divider {
  width: 1px;
  height: 28px;
  background: rgba(255,255,255,.35);
}
header h1 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 300;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #fff;
}

/* ── Progress bar ── */
.progress {
  background: var(--nephila-light);
  padding: 12px 32px;
  display: flex;
  gap: 8px;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.progress-step {
  flex: 1; height: 4px; border-radius: 2px;
  background: var(--border);
  transition: background .3s;
}
.progress-step.active      { background: rgba(0, 112, 158, 0.35); }
.progress-step.done-correct { background: var(--nephila-blue); }
.progress-step.done-wrong   { background: var(--nephila-accent); }

/* ── Main (scrollable chat area) ── */
main {
  flex: 1;
  overflow-y: auto;
  padding: 0 16px;
  scroll-behavior: smooth;
}

/* ── Chat thread ── */
.chat-thread {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ── Level separator ── */
.level-sep {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .8px;
  margin: 4px 0;
}
.level-sep::before,
.level-sep::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ── Bubble wrapper ── */
.bubble {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}
.bubble.agent { align-self: flex-start; max-width: 92%; }
.bubble.user  { align-self: flex-end; flex-direction: row-reverse; max-width: 72%; }

/* ── Bot avatar ── */
.bubble-avatar {
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--nephila-blue);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}
.bubble-avatar svg { width: 22px; height: 22px; }

/* ── Bubble inner ── */
.bubble-inner {
  padding: 12px 16px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.55;
}
.bubble.agent .bubble-inner {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-top-left-radius: 4px;
  color: var(--text);
}
.bubble.user .bubble-inner {
  background: var(--nephila-blue);
  color: #fff;
  border-top-right-radius: 4px;
}

/* ── Question bubble ── */
.bubble.question .bubble-inner {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: min(680px, 90vw);
}
.bubble .level-tag {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .8px; color: var(--nephila-accent);
}
.bubble h2 { font-family: var(--font-slab); font-size: 16px; font-weight: 700; color: var(--text); text-transform: uppercase; letter-spacing: 1px; }
.bubble p.desc { font-size: 13px; color: var(--muted); }

/* ── Code block ── */
.code-wrap {
  background: #0f172a;
  border-radius: 8px;
  overflow: hidden;
}
.code-wrap pre {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  padding: 16px 20px;
  overflow-x: auto;
  margin: 0;
}

/* ── Options ── */
.options { display: flex; flex-direction: column; gap: 8px; }
.option-btn {
  display: flex; align-items: center; gap: 10px;
  width: 100%; padding: 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  background: #fff;
  cursor: pointer;
  font-size: 14px; text-align: left;
  font-family: inherit;
  transition: border-color .15s, background .15s;
}
.option-btn:hover:not(:disabled) {
  border-color: var(--nephila-accent);
  background: var(--nephila-light);
}
.option-btn .key {
  font-weight: 700; font-size: 12px;
  width: 22px; height: 22px;
  border-radius: 4px;
  background: var(--nephila-blue); color: #fff;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.option-btn.selected    { border-color: var(--nephila-accent); background: var(--nephila-light); }
.option-btn.correct-opt { border-color: var(--correct); background: #f0fdf4; }
.option-btn.wrong-opt   { border-color: var(--wrong); background: #fef2f2; }
.option-btn:disabled    { cursor: default; opacity: .7; }

/* ── Feedback bubbles ── */
.bubble.feedback-correct .bubble-inner {
  border-color: var(--correct);
  background: #f0fdf4;
  color: #14532d;
}
.bubble.feedback-wrong .bubble-inner {
  border-color: var(--wrong);
  background: #fef2f2;
  color: #7f1d1d;
}
.bubble.feedback-jailbreak .bubble-inner {
  border-color: var(--jailbreak);
  background: #f5f3ff;
  color: #4c1d95;
}
.bubble.feedback-blocked .bubble-inner {
  border-color: var(--nephila-accent);
  background: #fff1f2;
  color: #881337;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bubble .verdict {
  font-weight: 700; font-size: 12px; text-transform: uppercase;
  letter-spacing: .5px; margin-bottom: 6px;
  color: inherit;
}
.turns-warning {
  margin-top: 8px;
  font-size: 12px;
  font-weight: 600;
  opacity: .75;
}

/* ── Transition bubble ── */
.bubble.transition .bubble-inner {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.next-level-btn {
  align-self: flex-start;
  padding: 9px 20px;
  background: var(--nephila-blue); color: #fff;
  border: none; border-radius: 8px;
  font-size: 13px; font-weight: 400; cursor: pointer;
  font-family: var(--font-sans);
  letter-spacing: 1px; text-transform: uppercase;
  transition: background .15s;
}
.next-level-btn:hover:not(:disabled) { background: var(--nephila-accent); }
.next-level-btn:disabled { opacity: .5; cursor: default; }

/* ── Typing indicator ── */
.typing-dots { display: flex; gap: 5px; align-items: center; height: 20px; }
.typing-dots span {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--muted);
  animation: blink 1.2s infinite;
}
.typing-dots span:nth-child(2) { animation-delay: .2s; }
.typing-dots span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%, 80%, 100% { opacity: .2; } 40% { opacity: 1; } }

/* ── Input bar ── */
.input-bar {
  flex-shrink: 0;
  background: var(--nephila-light);
  padding: 12px 16px;
}
.input-wrap {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  gap: 8px;
}
.chat-input {
  flex: 1; padding: 10px 14px;
  border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: inherit;
  outline: none; transition: border-color .15s;
  background: #fff;
}
.chat-input:focus { border-color: var(--nephila-accent); }
.chat-input:disabled { background: var(--surface); color: var(--muted); }
.send-btn {
  padding: 10px 20px;
  background: var(--nephila-blue); color: #fff;
  border: none; border-radius: 8px;
  font-size: 13px; font-weight: 400; cursor: pointer;
  font-family: var(--font-sans);
  letter-spacing: 1px; text-transform: uppercase;
  transition: background .15s;
  white-space: nowrap;
  min-width: 68px;
}
.send-btn:hover:not(:disabled) { background: var(--nephila-accent); }
.send-btn:disabled { opacity: .5; cursor: default; }

/* ── Spinner ── */
.spinner {
  display: inline-block;
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .6s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Prose (markdown-rendered bubbles) ── */
.prose { line-height: 1.6; }
.prose h2 { font-family: var(--font-sans); font-size: 16px; font-weight: 700; margin-bottom: 10px; color: var(--nephila-blue); text-transform: uppercase; letter-spacing: 1.5px; }
.prose h3 { font-family: var(--font-slab); font-size: 14px; font-weight: 400; margin-bottom: 6px; text-transform: uppercase; letter-spacing: 1px; }
.prose p  { margin-bottom: 8px; }
.prose p:last-child { margin-bottom: 0; }
.prose strong { font-weight: 700; }
.prose em { font-style: italic; }
.prose hr { border: none; border-top: 1.5px solid var(--border); margin: 12px 0; }
.prose ul, .prose ol { padding-left: 20px; margin-bottom: 8px; }
.prose li { margin-bottom: 4px; }
.prose table {
  width: 100%; border-collapse: collapse;
  font-size: 13px; margin: 10px 0;
  border-radius: 8px; overflow: hidden;
  border: 1.5px solid #cbd5e1;
}
.prose th {
  background: var(--nephila-blue); color: #fff;
  font-weight: 700; font-size: 11px;
  text-transform: uppercase; letter-spacing: .6px;
  padding: 8px 12px; text-align: left;
}
.prose td {
  padding: 7px 12px;
  border-top: 1px solid #e2e8f0;
  vertical-align: top;
}
.prose tr:nth-child(even) td { background: var(--nephila-light); }


/* ── Feedback section ── */
.feedback-section {
  display: none;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 0 48px;
}
.feedback-section.visible { display: block; }

.feedback-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,.07);
  overflow: hidden;
}
.feedback-card-header {
  background: var(--nephila-blue);
  color: #fff;
  padding: 16px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.feedback-card-header .level-tag {
  font-size: 11px; font-weight: 700; text-transform: uppercase;
  letter-spacing: .8px; color: var(--nephila-accent);
}
.feedback-card-header h2 { font-family: var(--font-slab); font-size: 18px; font-weight: 400; text-transform: uppercase; letter-spacing: 2px; }
.feedback-card-header p  { font-size: 13px; color: rgba(255,255,255,.7); margin-top: 2px; }

.feedback-card-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--muted); }
.form-group input,
.form-group textarea {
  padding: 10px 14px;
  border: 1.5px solid var(--border); border-radius: 8px;
  font-size: 14px; font-family: inherit;
  outline: none; transition: border-color .15s;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus { border-color: var(--nephila-accent); }

.submit-btn {
  padding: 11px 28px;
  background: var(--nephila-blue); color: #fff;
  border: none; border-radius: 8px;
  font-size: 13px; font-weight: 400; cursor: pointer;
  font-family: var(--font-sans);
  letter-spacing: 1px; text-transform: uppercase;
  align-self: flex-start;
  transition: background .15s;
}
.submit-btn:hover { background: var(--nephila-accent); }
.submit-btn:disabled { opacity: .5; cursor: default; }

.form-success {
  display: none;
  padding: 14px 16px;
  background: #f0fdf4; border: 1.5px solid var(--correct);
  border-radius: 8px; color: #14532d; font-size: 14px;
}
.form-success.visible { display: block; }

/* ── Mobile ── */
@media (max-width: 600px) {
  header { padding: 10px 16px; gap: 12px; }
  header h1 { font-size: 13px; letter-spacing: 1px; }
  .progress { padding: 0 16px 10px; }

  .bubble.agent {
    flex-direction: column;
    max-width: 100%;
    gap: 6px;
  }
  .bubble.agent .bubble-avatar { margin-top: 0; }
  .bubble.agent .bubble-inner { border-top-left-radius: 14px; }

  .bubble.question .bubble-inner { width: 100%; }

  .bubble.user { max-width: 92%; }

  .send-btn { padding: 10px 14px; min-width: 52px; font-size: 12px; }
  .input-bar { padding: 10px; }
}