/* ============================================================
   GENAI CLASSROOM — style.css
   Dark theme: clean, modern, professional
   ============================================================ */

/* ── Reset & base ─────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --purple:        #534AB7;
  --purple-dark:   #3C3489;
  --purple-bg:     rgba(83,74,183,0.15);
  --purple-border: rgba(83,74,183,0.35);
  --teal:          #0F6E56;
  --teal-dark:     #085041;
  --teal-bg:       rgba(15,110,86,0.15);
  --teal-border:   rgba(15,110,86,0.35);
  --gray:          #888780;
  --text-primary:   #ffffff;
  --text-secondary: rgba(255,255,255,0.60);
  --text-tertiary:  rgba(255,255,255,0.30);
  --border:         rgba(255,255,255,0.08);
  --border-md:      rgba(255,255,255,0.14);
  --surface:        rgba(255,255,255,0.05);
  --surface-2:      rgba(255,255,255,0.03);
  --radius-sm:      6px;
  --radius-md:      10px;
  --radius-lg:      16px;
  --radius-xl:      22px;
  --transition:     0.18s ease;
}

html, body {
  height: 100%;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", sans-serif;
  font-size: 15px;
  color: var(--text-primary);
  background: #0f0e17;
  line-height: 1.65;
}

/* ── Ambient background glow ──────────────────────────────── */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 60% at 15% 10%,  rgba(83,74,183,0.25)  0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 85% 80%,  rgba(15,110,86,0.20)  0%, transparent 55%),
    radial-gradient(ellipse 50% 40% at 60% 40%,  rgba(153,60,29,0.10)  0%, transparent 50%);
  pointer-events: none;
}


/* ── App wrapper ──────────────────────────────────────────── */
.app-wrapper {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
  position: relative;
  z-index: 1;
}


/* ── Header ───────────────────────────────────────────────── */
.app-header {
  text-align: center;
  padding: 3rem 1rem 2rem;
}

.app-header .logo {
  display: inline-block;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.20em;
  text-transform: uppercase;
  color: #a89ef5;
  background: rgba(83,74,183,0.18);
  border: 0.5px solid var(--purple-border);
  border-radius: 999px;
  padding: 4px 14px;
  margin-bottom: 1.1rem;
}

.app-header h1 {
  font-size: 40px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 0.65rem;
}

.app-header h1 span {
  color: #a89ef5;
}

.app-header .tagline {
  font-size: 15px;
  color: var(--text-secondary);
  max-width: 460px;
  margin: 0 auto;
  line-height: 1.65;
}

.header-divider {
  height: 1px;
  background: linear-gradient(to right, transparent, rgba(255,255,255,0.08), transparent);
  margin: 2rem 0;
}


/* ── API Key Panel ────────────────────────────────────────── */
.key-panel {
  background: var(--surface);
  border: 1px solid var(--purple-border);
  border-radius: var(--radius-xl);
  padding: 2rem 2rem 1.75rem;
  margin: 0 auto 2rem;
  text-align: center;
  max-width: 560px;
  backdrop-filter: blur(16px);
}

.key-panel.hidden { display: none; }

.key-panel-icon {
  font-size: 28px;
  margin-bottom: 0.65rem;
}

.key-panel-title {
  font-size: 17px;
  font-weight: 600;
  color: #ffffff;
  margin-bottom: 0.35rem;
}

.key-panel-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
}

.key-panel-sub a {
  color: #a89ef5;
  text-decoration: none;
  font-weight: 500;
}

.key-panel-sub a:hover {
  text-decoration: underline;
}

.key-input-row {
  display: flex;
  gap: 8px;
  max-width: 440px;
  margin: 0 auto 0.75rem;
}

.key-input-row input {
  flex: 1;
  font-size: 13px;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border-md);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.07);
  color: #ffffff;
  outline: none;
  font-family: monospace;
  letter-spacing: 0.03em;
  transition: border-color var(--transition), background var(--transition);
}

.key-input-row input:focus {
  border-color: var(--purple);
  background: rgba(255,255,255,0.10);
}

.key-input-row input::placeholder {
  color: var(--text-tertiary);
  font-family: -apple-system, sans-serif;
  letter-spacing: 0;
}

#connectBtn {
  font-size: 13px;
  font-weight: 600;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-md);
  border: none;
  background: var(--purple);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition);
}

#connectBtn:hover {
  background: var(--purple-dark);
  transform: translateY(-1px);
}

.key-message {
  font-size: 12px;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-md);
  display: inline-block;
}

.key-message.error   { background: rgba(163,45,45,0.20); color: #f5a0a0; }
.key-message.success { background: rgba(59,109,17,0.20); color: #90c96a; }
.key-message.hidden  { display: none; }


/* ── Connected badge ──────────────────────────────────────── */
.connected-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 500;
  color: #6ecfad;
  background: var(--teal-bg);
  border: 0.5px solid var(--teal-border);
  border-radius: 999px;
  padding: 5px 14px 5px 10px;
  margin: 0 auto 2rem;
  width: fit-content;
}

.connected-badge.hidden { display: none; }

.connected-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #6ecfad;
  flex-shrink: 0;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1;   transform: scale(1);    }
  50%       { opacity: 0.4; transform: scale(0.82); }
}

.disconnect-btn {
  margin-left: 4px;
  font-size: 11px;
  color: var(--text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
  transition: color var(--transition);
}

.disconnect-btn:hover { color: #ffffff; }


/* ── Section label ────────────────────────────────────────── */
.section-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 0.85rem;
}


/* ── Agent cards ──────────────────────────────────────────── */
.agents-section { margin-bottom: 2rem; }

#agentCards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.agent-card {
  background: var(--surface);
  border: 1.5px solid;
  border-radius: var(--radius-lg);
  padding: 1.25rem 0.85rem 1rem;
  text-align: center;
  backdrop-filter: blur(12px);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  cursor: default;
}

.agent-card:hover {
  transform: translateY(-3px);
  background: rgba(255,255,255,0.08);
  box-shadow: 0 8px 32px rgba(0,0,0,0.35);
}

.agent-avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  margin: 0 auto 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.agent-name        { font-size: 13px; font-weight: 600; color: #ffffff; margin-bottom: 3px; }
.agent-role        { font-size: 11px; color: var(--text-secondary); margin-bottom: 3px; }
.agent-institution { font-size: 10px; color: var(--text-tertiary); font-style: italic; }


/* ── Topic section ────────────────────────────────────────── */
.topic-section { margin-bottom: 1.25rem; }

.topic-controls {
  display: flex;
  gap: 10px;
  align-items: center;
}

#topicSelect {
  flex: 1;
  font-size: 14px;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border-md);
  border-radius: var(--radius-md);
  background: var(--surface);
  color: #ffffff;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition);
  appearance: auto;
}

#topicSelect:focus    { border-color: var(--purple); }
#topicSelect:disabled { opacity: 0.35; cursor: not-allowed; }

#topicSelect option { background: #1a1928; color: #ffffff; }

#startBtn {
  font-size: 14px;
  font-weight: 600;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-md);
  border: none;
  background: var(--purple);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition), opacity var(--transition);
}

#startBtn:hover:not(:disabled) {
  background: var(--purple-dark);
  transform: translateY(-1px);
}

#startBtn:disabled { opacity: 0.35; cursor: not-allowed; }


/* ── Topic banner ─────────────────────────────────────────── */
#topicBanner {
  font-size: 13px;
  font-weight: 500;
  color: #a89ef5;
  background: var(--purple-bg);
  border: 0.5px solid var(--purple-border);
  border-radius: var(--radius-md);
  padding: 0.6rem 1rem;
  margin-top: 0.75rem;
  line-height: 1.5;
}

#topicBanner.hidden { display: none; }


/* ── Debate feed ──────────────────────────────────────────── */
.feed-section { margin-bottom: 1.25rem; }

#debateFeed {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  min-height: 380px;
  max-height: 540px;
  overflow-y: auto;
  padding: 1.5rem;
  scroll-behavior: smooth;
  backdrop-filter: blur(12px);
}

#debateFeed::-webkit-scrollbar       { width: 4px; }
#debateFeed::-webkit-scrollbar-track { background: transparent; }
#debateFeed::-webkit-scrollbar-thumb { background: var(--border-md); border-radius: 99px; }

.feed-empty {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 14px;
  padding: 5rem 2rem;
  line-height: 2;
}


/* ── Message bubbles ──────────────────────────────────────── */
.message-wrap {
  margin-bottom: 1.25rem;
  animation: fadeSlideIn 0.24s ease both;
}

.message-wrap--student {
  display: flex;
  justify-content: flex-end;
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}

.message {
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.1rem 1.25rem;
  max-width: 86%;
}

.message--student {
  background: var(--purple-bg);
  border-color: var(--purple-border);
  max-width: 68%;
}

.message--moderator {
  background: rgba(255,255,255,0.03);
  border: 1px dashed var(--border-md);
  max-width: 100%;
}

.message--typing {
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0.9rem 1.25rem;
}

.message-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 0.65rem;
}

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

.message-meta       { display: flex; flex-direction: column; gap: 1px; }
.message-name       { font-size: 13px; font-weight: 600; }
.message-role       { font-size: 11px; color: var(--text-secondary); }
.message-institution{ font-size: 10px; color: var(--text-tertiary); font-style: italic; }

.message-text {
  font-size: 14px;
  color: rgba(255,255,255,0.88);
  line-height: 1.75;
}

.message-text p            { margin-bottom: 0.5rem; }
.message-text p:last-child { margin-bottom: 0; }

.summary-badge {
  margin-left: auto;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(255,255,255,0.08);
  color: var(--text-secondary);
  border: 0.5px solid var(--border-md);
  border-radius: 999px;
  padding: 3px 10px;
}


/* ── Typing dots ──────────────────────────────────────────── */
.typing-dots       { display: flex; gap: 5px; padding: 4px 2px; }

.typing-dots span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--text-tertiary);
  animation: typingBounce 1.3s infinite ease-in-out;
}

.typing-dots span:nth-child(2) { animation-delay: 0.18s; }
.typing-dots span:nth-child(3) { animation-delay: 0.36s; }

@keyframes typingBounce {
  0%, 80%, 100% { transform: translateY(0);    opacity: 0.4; }
  40%           { transform: translateY(-5px); opacity: 1;   }
}


/* ── Vote button ──────────────────────────────────────────── */
.message-actions { margin-top: 0.75rem; }

.vote-btn {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  background: transparent;
  border: 0.5px solid var(--border-md);
  border-radius: 999px;
  padding: 3px 12px;
  cursor: pointer;
  transition: all var(--transition);
}

.vote-btn:hover:not(:disabled) {
  background: var(--purple-bg);
  color: #a89ef5;
  border-color: var(--purple-border);
}

.vote-btn.voted {
  background: var(--purple-bg);
  color: #a89ef5;
  border-color: var(--purple-border);
  cursor: default;
}

.vote-count { font-weight: 700; }


/* ── Q&A section ──────────────────────────────────────────── */
#qaSection {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.4rem 1.5rem;
  margin-bottom: 1rem;
  backdrop-filter: blur(12px);
}

#qaSection.hidden { display: none; }

.qa-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 0.75rem;
}

.qa-controls { display: flex; gap: 10px; }

#studentQ {
  flex: 1;
  font-size: 14px;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border-md);
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.07);
  color: #ffffff;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
}

#studentQ:focus       { border-color: #6ecfad; background: rgba(255,255,255,0.10); }
#studentQ::placeholder { color: var(--text-tertiary); }

#askBtn {
  font-size: 13px;
  font-weight: 600;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  border: none;
  background: var(--teal);
  color: #fff;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition);
}

#askBtn:hover:not(:disabled) {
  background: var(--teal-dark);
  transform: translateY(-1px);
}

#askBtn:disabled { opacity: 0.35; cursor: not-allowed; }


/* ── Status bar ───────────────────────────────────────────── */
#statusBar {
  text-align: center;
  font-size: 12px;
  color: var(--text-tertiary);
  padding: 0.75rem 0 0;
  letter-spacing: 0.02em;
}


/* ── Responsive ───────────────────────────────────────────── */
@media (max-width: 700px) {
  .app-header h1              { font-size: 28px; }
  #agentCards                 { grid-template-columns: repeat(2, 1fr); }
  .message, .message--student { max-width: 100%; }
  .topic-controls             { flex-direction: column; }
  #startBtn                   { width: 100%; }
  .key-input-row              { flex-direction: column; }
  #connectBtn                 { width: 100%; }
}

@media (max-width: 420px) {
  #agentCards { gap: 8px; }
  .agent-card { padding: 1rem 0.6rem; }
}