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

:root {
  --bg: #0c0707;
  --bg-card: #171010;
  --bg-input: #1e1214;
  --text: #e8e0e0;
  --text-muted: #a07070;
  --accent: #d71920;
  --accent-hover: #e53a3f;
  --accent-glow: rgba(215, 25, 32, 0.3);
  --danger: #e74c3c;
  --success: #2ecc71;
  --border: #3a2020;
  --radius: 12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* === Screens === */
.screen {
  display: none;
  height: 100%;
  flex-direction: column;
}
.screen.active {
  display: flex;
}

/* === Login / Setup Screen === */
.login-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  gap: 32px;
  overflow-y: auto;
}

.logo {
  text-align: center;
}
.logo-image {
  max-width: 280px;
  height: auto;
  margin-bottom: 24px;
  display: block;
  margin-left: auto;
  margin-right: auto;
}
.logo h1 {
  font-size: 28px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
}
.subtitle {
  color: var(--accent);
  font-size: 14px;
  font-weight: 600;
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 2px;
}

/* === Auth Tabs === */
.auth-tabs {
  display: flex;
  gap: 0;
  width: 100%;
  max-width: 360px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}
.auth-tab {
  flex: 1;
  padding: 12px;
  font-size: 14px;
  font-weight: 600;
  background: var(--bg-card);
  color: var(--text-muted);
  border: none;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.auth-tab.active {
  background: var(--accent);
  color: #fff;
}

/* === Forms === */
.auth-form, #setup-form {
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.auth-form label, #setup-form label {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 500;
}
.auth-form input, #setup-form input {
  width: 100%;
  padding: 14px 16px;
  font-size: 16px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
}
.auth-form input:focus, #setup-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.auth-form input::placeholder, #setup-form input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.form-error {
  font-size: 13px;
  color: var(--danger);
  min-height: 18px;
}

.btn-primary {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}
.btn-primary:hover {
  background: var(--accent-hover);
}
.btn-primary:active {
  transform: scale(0.98);
}
.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 600;
  background: var(--bg-card);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.2s;
}
.btn-secondary:hover {
  border-color: var(--text-muted);
}

.login-footer {
  margin-top: 16px;
  font-size: 13px;
  color: var(--text-muted);
  text-align: center;
}

/* === Top Bar === */
.top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  gap: 12px;
}
.header-logo {
  width: 28px;
  height: 28px;
  object-fit: contain;
}
.user-badge {
  font-size: 13px;
  color: var(--accent);
  font-weight: 600;
  font-family: var(--font-mono);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* === Game Info Bar === */
.game-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
}
.timer-badge {
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text);
  background: var(--bg-input);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.score-badge {
  font-size: 14px;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--success);
  background: rgba(46, 204, 113, 0.1);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(46, 204, 113, 0.3);
}

.btn-icon {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-muted);
  font-size: 18px;
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
  flex-shrink: 0;
}
.btn-icon:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

/* === Select Screen === */
.select-container {
  flex: 1;
  overflow-y: auto;
  padding: 24px 16px;
  padding-bottom: calc(24px + var(--safe-bottom));
}
.select-container h2 {
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
}
.select-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.challenge-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.challenge-card {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  text-align: left;
  color: var(--text);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.15s, box-shadow 0.2s;
}
.challenge-card:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
  transform: translateY(-2px);
}
.challenge-card:active {
  transform: translateY(0);
}
.challenge-card.completed {
  border-color: var(--success);
}
.challenge-card.completed:hover {
  box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.3);
}

.card-image {
  width: 100%;
  height: 140px;
  background-size: cover;
  background-position: center top;
}
.card-body {
  padding: 16px;
}
.card-icon {
  font-size: 32px;
  margin-bottom: 12px;
}
.inline-icon {
  height: 1.2em;
  width: auto;
  vertical-align: middle;
  margin-right: 8px;
  display: inline-block;
}
.challenge-card h3 {
  font-size: 17px;
  font-weight: 700;
  margin-bottom: 6px;
}
.challenge-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  margin-bottom: 12px;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent);
  background: var(--accent-glow);
  padding: 4px 10px;
  border-radius: 20px;
}
.card-status {
  font-size: 12px;
  font-weight: 700;
}
.card-status.done {
  color: var(--success);
}

/* === Training Section === */
.training-section {
  margin-bottom: 24px;
}
.training-section h3 {
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.training-card {
  width: 100%;
  border-color: #2ecc71;
}
.training-card:hover {
  border-color: #2ecc71;
  box-shadow: 0 0 0 3px rgba(46, 204, 113, 0.3);
}
.training-tag {
  color: #2ecc71;
  background: rgba(46, 204, 113, 0.15);
}

/* === AI Guard Section === */
.ai-guard-section {
  margin-top: 24px;
}
.ai-guard-card {
  width: 100%;
  border-color: var(--accent);
}
.ai-guard-card:hover {
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* === Play Now Section === */
.play-now-section {
  text-align: center;
  margin-top: 32px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}
.btn-play-now {
  display: inline-block;
  padding: 16px 48px;
  font-size: 18px;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s, box-shadow 0.2s;
  box-shadow: 0 0 20px var(--accent-glow);
}
.btn-play-now:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-2px);
}
.btn-play-now:active {
  transform: translateY(0);
}
.play-now-hint {
  margin-top: 12px;
  font-size: 13px;
  color: var(--text-muted);
}

/* === Footer === */
.footer {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.footer p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}
.footer strong {
  color: var(--text);
  font-weight: 600;
}

/* === Chat Screen === */
.chat-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  min-height: 52px;
}
.btn-back {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--text);
  font-size: 22px;
  cursor: pointer;
  flex-shrink: 0;
}
.chat-title {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 15px;
  min-width: 0;
}
#chat-challenge-icon {
  font-size: 22px;
  flex-shrink: 0;
}
#chat-challenge-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  scroll-behavior: smooth;
}

.message {
  max-width: 85%;
  padding: 12px 16px;
  border-radius: var(--radius);
  font-size: 15px;
  line-height: 1.6;
  word-break: break-word;
  white-space: pre-wrap;
}
.message.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.message.assistant {
  align-self: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.message.assistant.streaming {
  border-color: var(--accent);
}
.message.system {
  align-self: center;
  max-width: 90%;
  text-align: center;
  font-size: 13px;
  color: var(--text-muted);
  padding: 8px 16px;
}

.typing-indicator {
  display: inline-flex;
  gap: 4px;
  padding: 4px 0;
}
.typing-indicator span {
  width: 6px;
  height: 6px;
  background: var(--text-muted);
  border-radius: 50%;
  animation: typing 1.2s ease-in-out infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.15s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}

/* === AI Guard Toggle === */
.ai-guard-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
  margin-right: 8px;
}
.toggle-label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.toggle-switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}
.toggle-switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.toggle-slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background: var(--border);
  border-radius: 22px;
  transition: background 0.3s;
}
.toggle-slider::before {
  content: "";
  position: absolute;
  height: 16px;
  width: 16px;
  left: 3px;
  bottom: 3px;
  background: var(--text-muted);
  border-radius: 50%;
  transition: transform 0.3s, background 0.3s;
}
.toggle-switch input:checked + .toggle-slider {
  background: var(--success);
}
.toggle-switch input:checked + .toggle-slider::before {
  transform: translateX(18px);
  background: #fff;
}

/* === AI Guard Blocked Message === */
.message.blocked {
  align-self: flex-start;
  background: rgba(231, 76, 60, 0.1);
  border: 1px solid rgba(231, 76, 60, 0.4);
  border-bottom-left-radius: 4px;
  color: #e74c3c;
}
.blocked-title {
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.blocked-reason {
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  opacity: 0.85;
}

/* === Answer Area === */
.answer-area {
  border-top: 1px solid var(--border);
  padding: 12px 16px;
  padding-bottom: calc(12px + var(--safe-bottom));
  background: var(--bg-card);
}
.answer-form {
  display: flex;
  gap: 8px;
  max-width: 680px;
  margin: 0 auto;
}
.answer-form input {
  flex: 1;
  padding: 10px 14px;
  font-size: 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  outline: none;
}
.answer-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.btn-submit-answer {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  background: var(--success);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.2s;
}
.btn-submit-answer:hover {
  background: #27ae60;
}
.btn-submit-answer:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.answer-history {
  max-width: 680px;
  margin: 0 auto 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.answer-attempt {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 20px;
  font-family: var(--font-mono);
}
.answer-attempt.incorrect {
  background: rgba(231, 76, 60, 0.15);
  color: var(--danger);
  border: 1px solid rgba(231, 76, 60, 0.3);
}
.answer-attempt.correct {
  background: rgba(46, 204, 113, 0.15);
  color: var(--success);
  border: 1px solid rgba(46, 204, 113, 0.3);
}

/* === Chat Input === */
.chat-input-area {
  padding: 8px 12px;
  border-top: 1px solid var(--border);
  background: var(--bg);
}
#chat-form {
  max-width: 680px;
  margin: 0 auto;
}
.input-row {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 6px 8px;
  transition: border-color 0.2s;
}
.input-row:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

#chat-input {
  flex: 1;
  background: none;
  border: none;
  color: var(--text);
  font-size: 16px;
  font-family: var(--font);
  resize: none;
  outline: none;
  padding: 8px 4px;
  max-height: 120px;
  line-height: 1.4;
}
#chat-input::placeholder {
  color: var(--text-muted);
  opacity: 0.6;
}

.btn-send {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  border: none;
  border-radius: 50%;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.2s, transform 0.1s;
}
.btn-send:hover {
  background: var(--accent-hover);
}
.btn-send:active {
  transform: scale(0.92);
}
.btn-send:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* === Scoreboard === */
.scoreboard-title {
  flex: 1;
  font-size: 18px;
  font-weight: 700;
}
.scoreboard-banner {
  text-align: center;
  padding: 24px 16px 16px;
  border-bottom: 1px solid var(--border);
}
.scoreboard-banner-logo {
  max-width: 160px;
  height: auto;
  margin-bottom: 12px;
}
.scoreboard-banner h1 {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

/* Two-column layout: leaderboard left, images right */
.scoreboard-layout {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  justify-content: center;
  gap: 32px;
}
.scoreboard-layout.has-images {
  justify-content: flex-start;
}
.scoreboard-leaderboard {
  flex: 1;
  min-width: 0;
  max-width: 600px;
}
.scoreboard-layout.has-images .scoreboard-leaderboard {
  max-width: none;
}
.scoreboard-images {
  display: none;
  flex-direction: column;
  gap: 16px;
  width: 340px;
  flex-shrink: 0;
}
.scoreboard-layout.has-images .scoreboard-images {
  display: flex;
}
.scoreboard-img-slot {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
}
.scoreboard-img-slot img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: var(--radius);
}

.scoreboard-table {
  width: 100%;
  border-collapse: collapse;
}
.scoreboard-table th {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 12px 8px;
  border-bottom: 2px solid var(--border);
  text-align: left;
}
.scoreboard-table td {
  padding: 12px 8px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.scoreboard-table tr:hover td {
  background: var(--bg-card);
}
.scoreboard-table .rank-1 td { color: #ffd700; }
.scoreboard-table .rank-2 td { color: #c0c0c0; }
.scoreboard-table .rank-3 td { color: #cd7f32; }
.scoreboard-table .score-cell {
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--success);
}
.scoreboard-table .time-cell {
  font-family: var(--font-mono);
  color: var(--text-muted);
}
.scoreboard-note {
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 16px;
}

/* === Scoreboard Fullscreen === */
#scoreboard-screen:fullscreen,
#scoreboard-screen:-webkit-full-screen {
  background: var(--bg);
}
#scoreboard-screen:fullscreen .top-bar,
#scoreboard-screen:-webkit-full-screen .top-bar {
  display: none;
}
#scoreboard-screen:fullscreen .scoreboard-banner,
#scoreboard-screen:-webkit-full-screen .scoreboard-banner {
  padding: 32px 16px 24px;
}
#scoreboard-screen:fullscreen .scoreboard-banner-logo,
#scoreboard-screen:-webkit-full-screen .scoreboard-banner-logo {
  max-width: 220px;
}
#scoreboard-screen:fullscreen .scoreboard-banner h1,
#scoreboard-screen:-webkit-full-screen .scoreboard-banner h1 {
  font-size: 32px;
}
#scoreboard-screen:fullscreen .scoreboard-layout,
#scoreboard-screen:-webkit-full-screen .scoreboard-layout {
  padding: 24px 40px;
  gap: 48px;
}
#scoreboard-screen:fullscreen .scoreboard-images,
#scoreboard-screen:-webkit-full-screen .scoreboard-images {
  width: 420px;
}
#scoreboard-screen:fullscreen .scoreboard-table th,
#scoreboard-screen:-webkit-full-screen .scoreboard-table th {
  font-size: 14px;
  padding: 16px 12px;
}
#scoreboard-screen:fullscreen .scoreboard-table td,
#scoreboard-screen:-webkit-full-screen .scoreboard-table td {
  font-size: 18px;
  padding: 16px 12px;
}

/* === Modal === */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}
.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  max-width: 420px;
  width: 100%;
}
.modal-box h3 {
  font-size: 20px;
  margin-bottom: 12px;
}
.modal-box p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 24px;
}
.modal-actions {
  display: flex;
  gap: 12px;
  justify-content: flex-end;
}

/* === Success Toast === */
.success-toast {
  position: fixed;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--success);
  color: #fff;
  padding: 14px 28px;
  border-radius: var(--radius);
  font-size: 16px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 200;
  box-shadow: 0 4px 20px rgba(46, 204, 113, 0.4);
  animation: toastIn 0.3s ease-out;
}
.toast-icon {
  font-size: 20px;
}
@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(-20px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* === Tablet/Desktop === */
@media (min-width: 600px) {
  .challenge-grid {
    grid-template-columns: 1fr 1fr;
  }
  .card-image {
    height: 180px;
  }
  .select-container {
    max-width: 640px;
    margin: 0 auto;
  }
  .chat-messages {
    max-width: 680px;
    margin: 0 auto;
    width: 100%;
  }
  .message {
    max-width: 70%;
  }
  .ai-guard-section {
    display: block;
  }
  .ai-guard-card {
    width: 100%;
  }
}

@media (min-width: 900px) {
  .login-container {
    gap: 48px;
  }
  .logo-image {
    max-width: 320px;
  }
  .logo h1 {
    font-size: 36px;
  }
}

/* === Scrollbar === */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}