:root {
  color-scheme: light dark;
  --bg: #101418;
  --surface: #1b2229;
  --surface-alt: #232c36;
  --border: #2f3a45;
  --accent: #3da5d9;
  --accent-strong: #2c84b3;
  --text: #eef1f5;
  --text-muted: #99a4b0;
  --success: #3fbf7f;
  --error: #f97171;
  --warning: #f0c674;
  font-family: "Segoe UI", Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  gap: 1.5rem;
}

.top-bar h1 {
  margin: 0;
  font-size: 1.4rem;
}

.top-bar small {
  color: var(--text-muted);
}

.session-controls {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.session-controls label {
  display: flex;
  flex-direction: column;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.session-controls input,
.session-controls select {
  margin-top: 0.25rem;
  padding: 0.4rem 0.6rem;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 0.4rem;
  color: var(--text);
}

.session-controls input,
.session-controls select,
.input-group input,
.input-group textarea,
button {
  min-height: 2.75rem;
}

.control-descriptions {
  flex-basis: 100%;
  max-width: 52rem;
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.86rem;
  line-height: 1.35;
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.browser-status {
  flex-basis: 100%;
  max-width: 52rem;
  margin-left: auto;
  color: var(--text-muted);
  font-size: 0.84rem;
  line-height: 1.35;
  text-align: right;
}

.browser-status.status-success {
  color: var(--success);
}

.browser-status.status-warning {
  color: var(--warning);
}

.browser-status.status-error {
  color: var(--error);
}

.filter-note {
  margin: -0.35rem 0 0.75rem 0;
  color: var(--text-muted);
  font-size: 0.86rem;
  line-height: 1.35;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 0.5rem;
  padding: 0.55rem 1.2rem;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s ease, color 0.2s ease, opacity 0.2s ease;
  touch-action: manipulation;
}

button.primary {
  background: var(--accent);
  color: #031520;
}

button.primary:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

button.primary:hover:not(:disabled) {
  background: var(--accent-strong);
}

button.ghost {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

button.ghost:hover:not(:disabled) {
  color: var(--text);
  border-color: var(--text-muted);
}

.config-panel {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  padding: 1.5rem 2rem;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}

.config-block h2 {
  margin: 0 0 0.8rem 0;
  font-size: 1.1rem;
}

.config-toggle {
  display: none;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-actions {
  display: inline-flex;
  gap: 0.35rem;
  align-items: center;
  margin-right: 0.25rem;
}

.mini-action {
  padding: 0.32rem 0.65rem;
  border-radius: 0.35rem;
  background: var(--surface);
  color: var(--text-muted);
  border: 1px solid var(--border);
  font-size: 0.82rem;
  font-weight: 600;
}

.mini-action:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 500;
}

.toggle input {
  margin-right: 0.5rem;
}

.chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  background: transparent;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--text-muted);
  min-height: 2.5rem;
}

.chip input[type="checkbox"] {
  accent-color: var(--accent);
}

.main-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 1.5rem;
  padding: 1.5rem 2rem 2rem 2rem;
}

.card-panel {
  background: var(--surface);
  border-radius: 1rem;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.2rem;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}

.timer {
  font-size: 1.8rem;
  font-family: "SFMono-Regular", Consolas, monospace;
  color: var(--text);
}

.progress {
  font-size: 0.95rem;
  color: var(--text-muted);
  transition: color 0.2s ease;
}

.progress.status-info {
  color: var(--text-muted);
}

.progress.status-warning {
  color: var(--warning);
}

.progress.status-error {
  color: var(--error);
}

.progress.status-success {
  color: var(--success);
}

.card-body {
  display: flex;
  gap: 1.5rem;
  padding: 1.5rem;
  flex: 1;
  min-height: 420px;
}

.media-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  min-width: 0;
}

.image-container {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  background: #060808;
  border-radius: 0.8rem;
  border: 1px solid var(--border);
  overflow: hidden;
}

.image-container img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  background: #000;
}

.cue-overlay {
  position: absolute;
  pointer-events: none;
  z-index: 2;
}

.cue-overlay.hidden {
  display: none;
}

.cue-overlay-target {
  position: absolute;
  width: 1.05rem;
  height: 1.05rem;
  border: 3px solid #ff2a22;
  border-radius: 50%;
  background: rgba(255, 42, 34, 0.14);
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.85), 0 0 14px rgba(0, 0, 0, 0.65);
  transform: translate(-50%, -50%);
}

.cue-overlay-line {
  position: absolute;
  height: 3px;
  background: #ff2a22;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.85), 0 0 8px rgba(0, 0, 0, 0.65);
  transform-origin: left center;
}

.cue-overlay-line::after {
  content: '';
  position: absolute;
  right: -1px;
  top: 50%;
  width: 0;
  height: 0;
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
  border-left: 12px solid #ff2a22;
  transform: translateY(-50%);
}

.cue-overlay-label {
  position: absolute;
  max-width: min(18rem, 42%);
  padding: 0.35rem 0.5rem;
  color: #fff;
  background: rgba(142, 20, 18, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.78);
  border-radius: 0.35rem;
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1.2;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.35);
}

.country-flags {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 3.25rem;
  padding: 0.55rem 0.7rem;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: 0.6rem;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.country-flags.hidden {
  display: none;
}

.country-flags img {
  width: 4.5rem;
  height: 3rem;
  object-fit: contain;
  background: #fff;
  border: 1px solid var(--border);
}

.country-flags span {
  overflow-wrap: anywhere;
}

.prompt-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.prompt-container h2 {
  margin: 0;
  font-size: 1.2rem;
}

#answer-form {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.recognition-guide {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 0.75rem;
  background: rgba(240, 198, 116, 0.1);
  border: 1px solid rgba(240, 198, 116, 0.35);
  border-radius: 0.6rem;
  color: var(--text);
  font-size: 0.92rem;
  line-height: 1.35;
}

.recognition-guide ul {
  margin: 0.15rem 0 0 1rem;
  padding: 0;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.input-group label {
  font-weight: 600;
  font-size: 0.95rem;
}

.input-group input,
.input-group textarea {
  padding: 0.5rem 0.6rem;
  border-radius: 0.5rem;
  border: 1px solid var(--border);
  background: var(--surface-alt);
  color: var(--text);
  font-size: 1rem;
  width: 100%;
}

.input-group.correct input,
.input-group.correct textarea {
  border-color: var(--success);
}

.input-group.incorrect input,
.input-group.incorrect textarea {
  border-color: var(--error);
}

.feedback {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.feedback strong {
  color: var(--text);
}

.prompt-actions {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.action-spacer {
  flex: 1;
}

.hint-box {
  padding: 0.8rem;
  background: rgba(61, 165, 217, 0.1);
  border: 1px solid rgba(61, 165, 217, 0.3);
  border-radius: 0.6rem;
  font-size: 0.95rem;
  line-height: 1.45;
  white-space: pre-wrap;
  max-height: 180px;
  overflow-y: auto;
}

.hint-box.hidden {
  display: none;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar section {
  background: var(--surface);
  border-radius: 1rem;
  border: 1px solid var(--border);
  padding: 1.2rem;
}

.sidebar h2 {
  margin: 0 0 0.8rem 0;
  font-size: 1.1rem;
}

.stats ul,
.history ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.history li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.6rem;
  border-radius: 0.6rem;
  background: var(--surface-alt);
  font-size: 0.9rem;
}

.history li.good {
  border-left: 3px solid var(--success);
}

.history li.bad {
  border-left: 3px solid var(--error);
}

@media (max-width: 1200px) {
  .main-layout {
    grid-template-columns: 1fr;
  }
  .sidebar {
    flex-direction: row;
    flex-wrap: wrap;
  }
  .sidebar section {
    flex: 1 1 260px;
  }
}

@media (max-width: 860px) {
  .top-bar {
    align-items: stretch;
    flex-direction: column;
    padding: 0.9rem 1rem;
  }
  .session-controls {
    justify-content: stretch;
    gap: 0.65rem;
  }
  .session-controls label {
    flex: 1 1 9rem;
  }
  .session-controls button {
    flex: 1 1 8rem;
  }
  .control-descriptions {
    max-width: none;
    text-align: left;
  }
  .browser-status {
    max-width: none;
    margin-left: 0;
    text-align: left;
  }
  .config-panel {
    grid-template-columns: 1fr;
    padding: 1rem;
    gap: 1rem;
  }
  .main-layout {
    padding: 1rem;
  }
  .card-body {
    flex-direction: column;
    padding: 1rem;
  }
  .image-container {
    min-height: 260px;
    height: 42vh;
  }
  .prompt-actions {
    flex-wrap: wrap;
  }
  .prompt-actions button {
    flex: 1 1 7rem;
  }
  .action-spacer {
    display: none;
  }
}

@media (max-width: 520px) {
  body {
    overflow-x: hidden;
  }
  .app {
    min-width: 0;
  }
  .top-bar {
    gap: 0.85rem;
  }
  .top-bar h1 {
    font-size: 1.15rem;
  }
  .brand small {
    display: block;
    margin-top: 0.15rem;
  }
  .session-controls {
    gap: 0.55rem;
  }
  .session-controls label {
    flex-basis: 100%;
    font-size: 0.86rem;
  }
  .session-controls input,
  .session-controls select,
  .input-group input,
  .input-group textarea {
    font-size: 1rem;
    padding: 0.72rem 0.75rem;
  }
  .session-controls button {
    flex-basis: calc(50% - 0.5rem);
    padding-left: 0.5rem;
    padding-right: 0.5rem;
  }
  .control-descriptions {
    display: none;
  }
  .browser-status {
    padding: 0.6rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 0.55rem;
    background: var(--surface-alt);
    font-size: 0.8rem;
  }
  .config-panel {
    padding: 0.75rem;
    gap: 0.65rem;
  }
  .config-block {
    border: 1px solid var(--border);
    border-radius: 0.6rem;
    background: var(--surface);
    overflow: hidden;
  }
  .config-block h2 {
    display: none;
  }
  .config-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    min-height: 3rem;
    padding: 0.75rem 0.85rem;
    border: 0;
    border-radius: 0;
    background: var(--surface);
    color: var(--text);
    text-align: left;
    font-size: 0.98rem;
  }
  .config-toggle::after {
    content: "Hide";
    color: var(--text-muted);
    font-size: 0.82rem;
    font-weight: 600;
  }
  .config-block.is-collapsed .config-toggle::after {
    content: "Show";
  }
  .config-block-body {
    padding: 0 0.85rem 0.85rem 0.85rem;
  }
  .config-block.is-collapsed .config-block-body {
    display: none;
  }
  .chip-list {
    gap: 0.45rem;
    max-height: 40vh;
    overflow-y: auto;
    padding-bottom: 0.1rem;
  }
  .chip,
  .mini-action,
  .toggle {
    min-height: 2.75rem;
  }
  .chip {
    width: 100%;
    justify-content: flex-start;
    border-radius: 0.55rem;
    padding: 0.65rem 0.75rem;
    font-size: 0.95rem;
  }
  .chip input[type="checkbox"],
  .toggle input {
    width: 1.15rem;
    height: 1.15rem;
    flex: 0 0 auto;
  }
  .filter-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
    margin: 0 0 0.15rem 0;
  }
  .mini-action {
    width: 100%;
    border-radius: 0.5rem;
  }
  .main-layout {
    padding: 0.75rem;
    gap: 0.85rem;
  }
  .card-panel,
  .sidebar section {
    border-radius: 0.6rem;
  }
  .card-top {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.4rem;
    padding: 0.8rem;
  }
  .timer {
    font-size: 1.55rem;
  }
  .progress {
    font-size: 0.86rem;
    line-height: 1.35;
  }
  .card-body {
    gap: 0.9rem;
    padding: 0.75rem;
    min-height: 0;
  }
  .image-container {
    min-height: 240px;
    height: min(48vh, 430px);
    border-radius: 0.55rem;
  }
  .cue-overlay-label {
    max-width: min(14rem, 58%);
    font-size: 0.72rem;
  }
  .country-flags {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.45rem;
    font-size: 0.82rem;
  }
  .country-flags img {
    width: 3.8rem;
    height: 2.5rem;
  }
  .prompt-container {
    gap: 0.75rem;
  }
  .prompt-container h2 {
    font-size: 1.05rem;
    line-height: 1.3;
  }
  #answer-form {
    gap: 0.7rem;
  }
  .recognition-guide {
    font-size: 0.86rem;
    max-height: 34vh;
    overflow-y: auto;
  }
  .input-group label {
    font-size: 0.9rem;
  }
  .input-group textarea {
    min-height: 5.5rem;
  }
  .prompt-actions {
    position: sticky;
    bottom: 0;
    z-index: 5;
    margin: 0 -0.75rem -0.75rem -0.75rem;
    padding: 0.65rem 0.75rem calc(0.65rem + env(safe-area-inset-bottom, 0px));
    background: var(--surface);
    background: color-mix(in srgb, var(--surface) 94%, transparent);
    border-top: 1px solid var(--border);
    backdrop-filter: blur(10px);
  }
  .prompt-actions button {
    min-height: 3rem;
    flex: 1 1 calc(33.333% - 0.55rem);
    padding-left: 0.45rem;
    padding-right: 0.45rem;
  }
  .hint-box {
    max-height: 34vh;
    font-size: 0.88rem;
  }
  .sidebar {
    gap: 0.85rem;
  }
  .sidebar section {
    padding: 0.9rem;
  }
  .history li {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }
  .filter-note,
  .control-descriptions {
    font-size: 0.82rem;
  }
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f3f5f8;
    --surface: #ffffff;
    --surface-alt: #f3f6fa;
    --border: #d7dde4;
    --accent: #0f89d6;
    --accent-strong: #0c6dad;
    --text: #1b2430;
    --text-muted: #526071;
    --warning: #b6881a;
  }
  body {
    color: var(--text);
  }
  .history li {
    background: #fff;
    border: 1px solid var(--border);
  }
}