:root {
  color-scheme: light;
  --bg: #f4f0e8;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: #ffffff;
  --ink: #101826;
  --muted: #647084;
  --line: rgba(16, 24, 38, 0.11);
  --accent: #1c4f5f;
  --accent-strong: #123d4a;
  --accent-soft: #e4f1f2;
  --warm: #a86f35;
  --danger: #9f352f;
  --warning: #8a5d12;
  --success: #236a4a;
  --shadow: 0 20px 60px rgba(22, 31, 47, 0.12);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --tap: 48px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { min-height: 100%; }

body {
  min-height: 100%;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(28, 79, 95, 0.16), transparent 34rem),
    linear-gradient(135deg, #fbf8f1 0%, var(--bg) 54%, #e8edf0 100%);
}

button, select { font: inherit; }

button { cursor: pointer; }

button:disabled {
  cursor: not-allowed;
  opacity: 0.58;
}

.app-shell {
  width: min(1120px, 100%);
  margin: 0 auto;
  padding: 18px 16px 28px;
}

.hero {
  background: linear-gradient(145deg, rgba(16, 24, 38, 0.96), rgba(28, 79, 95, 0.94));
  color: #fff;
  border-radius: var(--radius-xl);
  padding: 18px;
  box-shadow: var(--shadow);
  overflow: hidden;
  position: relative;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -60px -90px auto;
  width: 210px;
  height: 210px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  position: relative;
  z-index: 1;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 15px;
  background: rgba(255, 255, 255, 0.10);
  font-weight: 800;
  letter-spacing: -0.05em;
}

.version-pill, .counter-pill {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-copy {
  margin: 42px 0 24px;
  position: relative;
  z-index: 1;
}

.eyebrow, .section-kicker, .hint-label, .metric-label {
  margin: 0;
  color: inherit;
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.72rem;
  font-weight: 800;
}

.eyebrow { color: rgba(255, 255, 255, 0.72); }

h1, h2, p { margin-top: 0; }

h1 {
  margin-bottom: 12px;
  font-size: clamp(2.45rem, 12vw, 5rem);
  line-height: 0.92;
  letter-spacing: -0.07em;
}

.subtitle {
  max-width: 700px;
  margin-bottom: 0;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(1rem, 3.4vw, 1.32rem);
  line-height: 1.45;
}

.progress-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  position: relative;
  z-index: 1;
}

.metric-card {
  min-width: 0;
  padding: 14px 12px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(18px);
}

.metric-label {
  display: block;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.62rem;
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.3rem;
  letter-spacing: -0.04em;
}

main { margin-top: 16px; }

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: var(--surface);
  box-shadow: 0 12px 40px rgba(22, 31, 47, 0.08);
  backdrop-filter: blur(16px);
}

.controls-panel {
  display: grid;
  gap: 12px;
  padding: 14px;
}

.field-group {
  display: grid;
  gap: 8px;
}

label {
  color: var(--muted);
  font-size: 0.84rem;
  font-weight: 800;
}

select {
  width: 100%;
  min-height: var(--tap);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-strong);
  color: var(--ink);
  padding: 0 14px;
  outline: none;
}

select:focus, button:focus-visible {
  outline: 3px solid rgba(28, 79, 95, 0.28);
  outline-offset: 3px;
}

.exercise-layout {
  display: grid;
  gap: 16px;
  margin-top: 16px;
}

.exercise-card, .result-card { padding: 18px; }

.exercise-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.section-kicker, .hint-label {
  color: var(--muted);
  font-size: 0.68rem;
}

h2 {
  margin: 6px 0 0;
  font-size: clamp(2rem, 11vw, 4.8rem);
  line-height: 1;
  letter-spacing: -0.055em;
}

.counter-pill {
  flex: 0 0 auto;
  background: #eef4f4;
  color: var(--accent-strong);
  border-color: rgba(28, 79, 95, 0.14);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}

.chip {
  padding: 8px 10px;
  border-radius: 999px;
  background: #f4f6f6;
  color: #304052;
  border: 1px solid var(--line);
  font-size: 0.8rem;
  font-weight: 800;
}

.hint-box, .minimal-pair, .transcript-box, .feedback-box {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.64);
  padding: 14px;
}

.hint-box p, .minimal-pair p, .transcript-box p, .feedback-box p {
  margin: 8px 0 0;
  color: #314052;
  line-height: 1.55;
}

.minimal-pair {
  margin-top: 12px;
  background: #fff9ee;
}

.actions {
  display: grid;
  gap: 10px;
  margin-top: 16px;
}

.secondary-actions {
  grid-template-columns: 1fr 1fr;
  margin-top: 10px;
}

.btn {
  min-height: 54px;
  border: 0;
  border-radius: 18px;
  padding: 0 16px;
  font-weight: 900;
  letter-spacing: -0.01em;
  transition: transform 150ms ease, box-shadow 150ms ease, background 150ms ease;
}

.btn:active { transform: translateY(1px) scale(0.995); }

.btn.primary, .btn.mic {
  color: #fff;
  background: var(--accent);
  box-shadow: 0 12px 28px rgba(28, 79, 95, 0.24);
}

.btn.mic {
  min-height: 62px;
  font-size: 1.05rem;
  background: linear-gradient(135deg, #1c4f5f, #143843);
}

.btn.mic.listening {
  background: linear-gradient(135deg, #a44538, #6e231f);
  box-shadow: 0 12px 28px rgba(164, 69, 56, 0.24);
}

.btn.secondary {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.btn.ghost {
  color: #263343;
  background: #f4f6f6;
  border: 1px solid var(--line);
}

.status-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}

.status-row p { margin: 0; color: var(--muted); font-weight: 750; }

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 999px;
  background: #9aa4b2;
  box-shadow: 0 0 0 5px rgba(154, 164, 178, 0.12);
}

.status-dot.active {
  background: var(--danger);
  box-shadow: 0 0 0 6px rgba(159, 53, 47, 0.14);
}

.status-dot.good {
  background: var(--success);
  box-shadow: 0 0 0 6px rgba(35, 106, 74, 0.13);
}

.transcript-box p {
  min-height: 48px;
  font-size: 1.08rem;
  font-weight: 750;
  color: var(--ink);
}

.feedback-box {
  margin-top: 12px;
  background: #f7f8f8;
}

.feedback-box strong {
  display: inline-flex;
  margin-top: 12px;
  color: var(--muted);
}

.feedback-box.success {
  background: #edf7f1;
  border-color: rgba(35, 106, 74, 0.22);
}

.feedback-box.partial {
  background: #fff8e8;
  border-color: rgba(138, 93, 18, 0.22);
}

.feedback-box.confusion, .feedback-box.low {
  background: #fff0ee;
  border-color: rgba(159, 53, 47, 0.20);
}

.support-note {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.footer-note {
  margin: 18px auto 0;
  max-width: 760px;
  color: var(--muted);
  text-align: center;
  font-size: 0.88rem;
  line-height: 1.5;
}

.footer-note p { margin-bottom: 0; }

@media (min-width: 680px) {
  .app-shell { padding: 28px; }
  .hero { padding: 24px; }
  .controls-panel { grid-template-columns: 170px 1fr; padding: 16px; }
  .actions { grid-template-columns: 1fr 1.15fr; }
  .secondary-actions { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 940px) {
  .hero {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 24px;
    align-items: end;
  }
  .topbar { grid-column: 1 / -1; }
  .hero-copy { margin: 54px 0 0; }
  .progress-grid { align-self: end; }
  .exercise-layout { grid-template-columns: minmax(0, 1.18fr) minmax(320px, 0.82fr); align-items: start; }
  .exercise-card, .result-card { padding: 22px; }
}

/* v0.1.1 Stability & UX Polish */
.filter-summary {
  margin: 2px 0 0;
  align-self: end;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 750;
  line-height: 1.4;
}

.compact-field select {
  min-width: 150px;
}

.text-action {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  width: fit-content;
  min-height: 40px;
  margin: 14px auto 0;
  border: 0;
  background: transparent;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 850;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.text-action:hover {
  color: var(--accent-strong);
}

.analysis-note {
  margin-top: 10px !important;
  color: var(--muted) !important;
  font-size: 0.9rem;
  font-weight: 700;
}

.support-panel {
  margin-top: 12px;
  padding: 14px;
  border: 1px dashed rgba(16, 24, 38, 0.18);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.46);
}

.support-panel p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

@media (min-width: 680px) {
  .controls-panel {
    grid-template-columns: 150px minmax(230px, 1fr) 170px;
    align-items: end;
  }

  .filter-summary {
    grid-column: 1 / -1;
  }
}

@media (min-width: 940px) {
  .filter-summary {
    grid-column: auto;
    justify-self: end;
    text-align: right;
  }
}

/* v0.1.2 Stability & Browser Gate */
.btn.manual {
  color: #fff;
  background: linear-gradient(135deg, #7b5631, #4d3723);
  box-shadow: 0 12px 28px rgba(123, 86, 49, 0.22);
}

.feedback-box.manual {
  background: #f5efe6;
  border-color: rgba(168, 111, 53, 0.24);
}

.browser-status-list {
  display: grid;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 12px 0 0;
}

.browser-status-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px;
  border: 1px solid rgba(16, 24, 38, 0.08);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.64);
}

.browser-status-list li > span {
  flex: 0 0 auto;
  line-height: 1.25;
}

.browser-status-list strong,
.browser-status-list small {
  display: block;
}

.browser-status-list strong {
  color: var(--ink);
  font-size: 0.88rem;
  line-height: 1.25;
}

.browser-status-list small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.browser-status-list li.ok {
  border-color: rgba(35, 106, 74, 0.13);
  background: rgba(237, 247, 241, 0.72);
}

.browser-status-list li.warn {
  border-color: rgba(138, 93, 18, 0.15);
  background: rgba(255, 248, 232, 0.78);
}

.browser-status-list li.bad {
  border-color: rgba(159, 53, 47, 0.15);
  background: rgba(255, 240, 238, 0.78);
}

.btn[hidden] {
  display: none !important;
}

.actions:has(.btn.manual:not([hidden])) {
  grid-template-columns: 1fr;
}

.footer-note {
  max-width: 860px;
}

@media (min-width: 680px) {
  .actions:has(.btn.manual:not([hidden])) {
    grid-template-columns: 1fr 1.15fr;
  }

  .actions:has(.btn.manual:not([hidden])) .btn.secondary,
  .actions:has(.btn.manual:not([hidden])) .btn.manual {
    grid-column: auto;
  }
}

@media (min-width: 940px) {
  .browser-status-list {
    gap: 7px;
  }

  .browser-status-list li {
    padding: 9px 10px;
  }
}


/* v0.1.3 Pedagogical Feedback Pack */
.focus-guide,
.stress-box,
.teacher-note-box {
  border: 1px solid rgba(28, 79, 95, 0.14);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(228, 241, 242, 0.78), rgba(255, 255, 255, 0.68));
  padding: 14px;
}

.focus-guide {
  margin: -2px 0 12px;
}

.focus-guide p,
.stress-box p,
.teacher-note-box p {
  margin: 8px 0 0;
  color: #314052;
  line-height: 1.55;
}

.stress-box {
  margin-top: 12px;
  background: #f7fbfb;
}

.stress-box p {
  color: var(--accent-strong);
  font-size: clamp(1.25rem, 7vw, 2.25rem);
  font-weight: 900;
  letter-spacing: 0.02em;
}

.teacher-note-box {
  margin-top: 12px;
  border-color: rgba(168, 111, 53, 0.18);
  background: linear-gradient(135deg, rgba(255, 249, 238, 0.88), rgba(255, 255, 255, 0.7));
}

.feedback-box.confusion + .teacher-note-box,
.feedback-box.low + .teacher-note-box {
  border-color: rgba(159, 53, 47, 0.16);
  background: linear-gradient(135deg, rgba(255, 240, 238, 0.82), rgba(255, 255, 255, 0.72));
}

.feedback-box.success + .teacher-note-box {
  border-color: rgba(35, 106, 74, 0.16);
  background: linear-gradient(135deg, rgba(237, 247, 241, 0.85), rgba(255, 255, 255, 0.72));
}

@media (min-width: 940px) {
  .focus-guide,
  .stress-box,
  .teacher-note-box {
    padding: 15px;
  }
}

/* v0.1.4 Dataset Quality Pack */
.soft-chip {
  background: rgba(148, 163, 184, 0.12);
  border-color: rgba(148, 163, 184, 0.28);
  color: var(--muted);
}

.quality-box {
  border: 1px solid rgba(148, 163, 184, 0.22);
  background: rgba(15, 23, 42, 0.035);
  border-radius: 18px;
  padding: 0.9rem 1rem;
}

.quality-box p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  line-height: 1.45;
}

@media (prefers-color-scheme: dark) {
  .quality-box {
    background: rgba(255, 255, 255, 0.035);
    border-color: rgba(255, 255, 255, 0.12);
  }
}


/* v0.1.5 Practice Flow UX Pack */
.session-panel,
.summary-panel {
  margin-top: 16px;
  padding: 16px;
}

.session-panel {
  display: grid;
  gap: 14px;
}

.session-copy h2,
.summary-panel h2 {
  margin: 8px 0 8px;
  font-size: clamp(1.25rem, 5vw, 1.75rem);
  letter-spacing: -0.04em;
}

.session-copy p:not(.section-kicker),
.summary-panel p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.5;
}

.session-controls {
  display: grid;
  gap: 12px;
}

.session-progress {
  display: grid;
  gap: 12px;
  padding: 12px;
  border: 1px solid rgba(28, 79, 95, 0.13);
  border-radius: var(--radius-lg);
  background: rgba(228, 241, 242, 0.58);
}

.session-metrics,
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.session-metrics article,
.summary-grid article {
  min-width: 0;
  padding: 12px;
  border: 1px solid rgba(16, 24, 38, 0.08);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.74);
}

.session-metrics span,
.summary-grid span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.session-metrics strong,
.summary-grid strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

progress {
  width: 100%;
  height: 10px;
  overflow: hidden;
  border: 0;
  border-radius: 999px;
  background: rgba(16, 24, 38, 0.10);
}

progress::-webkit-progress-bar {
  border-radius: 999px;
  background: rgba(16, 24, 38, 0.10);
}

progress::-webkit-progress-value {
  border-radius: 999px;
  background: var(--accent);
}

progress::-moz-progress-bar {
  border-radius: 999px;
  background: var(--accent);
}

.summary-panel {
  border-color: rgba(35, 106, 74, 0.16);
  background: linear-gradient(135deg, rgba(237, 247, 241, 0.88), rgba(255, 255, 255, 0.82));
}

.summary-grid {
  grid-template-columns: repeat(2, 1fr);
  margin-top: 14px;
}

.recommendation {
  margin-top: 14px;
  padding: 12px 14px;
  border: 1px solid rgba(168, 111, 53, 0.16);
  border-radius: var(--radius-md);
  background: rgba(255, 249, 238, 0.82);
  color: #3c2e1c !important;
}

.summary-actions {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

@media (max-width: 420px) {
  .session-metrics,
  .summary-grid {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 680px) {
  .session-panel {
    grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
    align-items: end;
  }

  .session-progress {
    grid-column: 1 / -1;
  }

  .summary-actions,
  .session-controls {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 940px) {
  .summary-panel {
    padding: 20px;
  }

  .summary-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* v0.1.6 Local Progress Dashboard */
.dashboard-panel {
  margin-top: 16px;
  padding: 16px;
}

.dashboard-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.dashboard-head h2 {
  margin: 8px 0 8px;
  font-size: clamp(1.25rem, 5vw, 1.75rem);
  letter-spacing: -0.04em;
}

.dashboard-head p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.5;
}

.dashboard-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 6px 12px;
  border-radius: 999px;
  color: var(--success);
  background: rgba(237, 247, 241, 0.88);
  border: 1px solid rgba(35, 106, 74, 0.18);
  font-size: 0.78rem;
  font-weight: 900;
}

.dashboard-badge.warning {
  color: var(--warning);
  background: rgba(255, 248, 232, 0.88);
  border-color: rgba(138, 93, 18, 0.18);
}

.dashboard-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-top: 14px;
}

.dashboard-grid article {
  min-width: 0;
  padding: 12px;
  border: 1px solid rgba(16, 24, 38, 0.08);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.74);
}

.dashboard-grid span,
.dashboard-card-head small,
.focus-progress-row small,
.recent-result-row small {
  color: var(--muted);
}

.dashboard-grid span {
  display: block;
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.dashboard-grid strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-size: 1.05rem;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.dashboard-columns {
  display: grid;
  gap: 12px;
  margin-top: 12px;
}

.dashboard-card,
.next-practice-box {
  border: 1px solid rgba(16, 24, 38, 0.08);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.58);
  padding: 14px;
}

.dashboard-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.dashboard-card-head small {
  max-width: 220px;
  text-align: right;
  line-height: 1.35;
  font-size: 0.78rem;
  font-weight: 700;
}

.focus-progress-list,
.recent-results-list {
  display: grid;
  gap: 10px;
}

.focus-progress-row,
.recent-result-row {
  border: 1px solid rgba(16, 24, 38, 0.08);
  border-radius: 16px;
  background: rgba(244, 246, 246, 0.72);
  padding: 12px;
}

.focus-progress-top,
.recent-result-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}

.focus-progress-top strong,
.recent-result-row strong {
  color: var(--ink);
  line-height: 1.25;
}

.focus-progress-top span,
.recent-result-row span {
  flex: 0 0 auto;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 900;
  white-space: nowrap;
}

.focus-progress-row small,
.recent-result-row small {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  font-weight: 720;
  line-height: 1.35;
}

.mini-bar {
  height: 8px;
  margin-top: 10px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(16, 24, 38, 0.10);
}

.mini-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--accent);
}

.empty-line {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.next-practice-box {
  margin-top: 12px;
  border-color: rgba(168, 111, 53, 0.16);
  background: rgba(255, 249, 238, 0.78);
}

.next-practice-box p {
  margin: 8px 0 0;
  color: #3c2e1c;
  line-height: 1.5;
}

@media (max-width: 420px) {
  .dashboard-grid {
    grid-template-columns: 1fr;
  }

  .dashboard-head,
  .dashboard-card-head,
  .recent-result-row,
  .focus-progress-top {
    display: grid;
  }

  .dashboard-card-head small {
    text-align: left;
    max-width: none;
  }
}

@media (min-width: 680px) {
  .dashboard-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 940px) {
  .dashboard-panel {
    padding: 20px;
  }

  .dashboard-columns {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}


/* v0.1.7 UI/UX Premium Polish */
:root {
  --surface-muted: rgba(255, 255, 255, 0.58);
  --ink-soft: #314052;
  --focus-ring: rgba(28, 79, 95, 0.30);
  --panel-gap: 16px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b111a;
  --surface: rgba(17, 25, 38, 0.84);
  --surface-strong: #111927;
  --surface-muted: rgba(255, 255, 255, 0.055);
  --ink: #edf3f7;
  --ink-soft: #cbd5df;
  --muted: #9aa8b8;
  --line: rgba(255, 255, 255, 0.12);
  --accent: #74b7c5;
  --accent-strong: #c5eef5;
  --accent-soft: rgba(116, 183, 197, 0.14);
  --warm: #d0a36f;
  --danger: #ef8d83;
  --warning: #e2b55f;
  --success: #8bd7ae;
  --shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
  --focus-ring: rgba(116, 183, 197, 0.36);
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    color-scheme: dark;
    --bg: #0b111a;
    --surface: rgba(17, 25, 38, 0.84);
    --surface-strong: #111927;
    --surface-muted: rgba(255, 255, 255, 0.055);
    --ink: #edf3f7;
    --ink-soft: #cbd5df;
    --muted: #9aa8b8;
    --line: rgba(255, 255, 255, 0.12);
    --accent: #74b7c5;
    --accent-strong: #c5eef5;
    --accent-soft: rgba(116, 183, 197, 0.14);
    --warm: #d0a36f;
    --danger: #ef8d83;
    --warning: #e2b55f;
    --success: #8bd7ae;
    --shadow: 0 22px 70px rgba(0, 0, 0, 0.34);
    --focus-ring: rgba(116, 183, 197, 0.36);
  }
}

body {
  transition: background 180ms ease, color 180ms ease;
}

:root[data-theme="dark"] body {
  background:
    radial-gradient(circle at top left, rgba(116, 183, 197, 0.14), transparent 34rem),
    radial-gradient(circle at bottom right, rgba(208, 163, 111, 0.09), transparent 28rem),
    linear-gradient(135deg, #090e15 0%, var(--bg) 58%, #101925 100%);
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] body {
    background:
      radial-gradient(circle at top left, rgba(116, 183, 197, 0.14), transparent 34rem),
      radial-gradient(circle at bottom right, rgba(208, 163, 111, 0.09), transparent 28rem),
      linear-gradient(135deg, #090e15 0%, var(--bg) 58%, #101925 100%);
  }
}

.skip-link {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 20;
  transform: translateY(-140%);
  padding: 10px 12px;
  border-radius: 12px;
  background: var(--surface-strong);
  color: var(--ink);
  box-shadow: var(--shadow);
  font-weight: 900;
  text-decoration: none;
}

.skip-link:focus { transform: translateY(0); }

.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;
}

.topbar-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.theme-select {
  width: auto;
  min-width: 112px;
  min-height: 36px;
  padding: 0 30px 0 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.18);
  font-size: 0.82rem;
  font-weight: 850;
}

.theme-select option { color: #101826; }

.controls-heading {
  display: grid;
  gap: 5px;
  padding: 4px 2px 2px;
}

.controls-heading strong {
  color: var(--ink);
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.panel {
  position: relative;
  overflow: clip;
}

.controls-panel,
.session-panel,
.dashboard-panel,
.summary-panel,
.exercise-card,
.result-card {
  box-shadow: 0 16px 50px rgba(22, 31, 47, 0.075);
}

.exercise-card::before,
.result-card::before,
.dashboard-panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 4px;
  background: linear-gradient(90deg, var(--accent), rgba(168, 111, 53, 0.55), transparent);
  opacity: 0.72;
}

select,
.btn,
.text-action {
  -webkit-tap-highlight-color: transparent;
}

select:focus,
button:focus-visible,
.text-action:focus-visible,
.skip-link:focus {
  outline: 3px solid var(--focus-ring);
  outline-offset: 3px;
}

.btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: 0 16px 34px rgba(28, 79, 95, 0.24);
}

.btn.secondary:hover:not(:disabled),
.btn.ghost:hover:not(:disabled) {
  box-shadow: 0 10px 24px rgba(22, 31, 47, 0.10);
}

body.is-speaking .exercise-card::before { background: linear-gradient(90deg, var(--warm), var(--accent)); }
body.is-listening .exercise-card::before { background: linear-gradient(90deg, var(--danger), var(--warm)); }
body.is-manual-mode .result-card::before { background: linear-gradient(90deg, var(--warm), transparent); }

.hint-box,
.minimal-pair,
.transcript-box,
.feedback-box,
.focus-guide,
.stress-box,
.teacher-note-box,
.quality-box,
.dashboard-card,
.next-practice-box,
.session-progress,
.session-metrics article,
.summary-grid article,
.dashboard-grid article,
.focus-progress-row,
.recent-result-row,
.support-panel,
.browser-status-list li {
  background: var(--surface-muted);
  color: var(--ink-soft);
}

.hint-box p,
.minimal-pair p,
.transcript-box p,
.feedback-box p,
.focus-guide p,
.stress-box p,
.teacher-note-box p,
.quality-box p,
.next-practice-box p,
.recommendation,
.status-row p {
  color: var(--ink-soft) !important;
}

.feedback-box.success { background: color-mix(in srgb, var(--success) 12%, var(--surface-strong)); }
.feedback-box.partial { background: color-mix(in srgb, var(--warning) 12%, var(--surface-strong)); }
.feedback-box.confusion,
.feedback-box.low { background: color-mix(in srgb, var(--danger) 12%, var(--surface-strong)); }
.feedback-box.manual { background: color-mix(in srgb, var(--warm) 13%, var(--surface-strong)); }

.counter-pill,
.chip,
.session-metrics article,
.summary-grid article,
.dashboard-grid article,
.focus-progress-row,
.recent-result-row {
  background: var(--surface-muted);
  color: var(--ink-soft);
}

.dashboard-badge {
  color: var(--success);
  background: color-mix(in srgb, var(--success) 14%, transparent);
}

.dashboard-badge.warning {
  color: var(--warning);
  background: color-mix(in srgb, var(--warning) 14%, transparent);
}

.support-panel {
  border-style: solid;
}

.footer-note {
  padding: 0 12px calc(env(safe-area-inset-bottom, 0px) + 2px);
}

@media (max-width: 520px) {
  .topbar {
    align-items: flex-start;
  }

  .topbar-actions {
    max-width: 170px;
  }

  .theme-select {
    max-width: 140px;
  }

  .progress-grid {
    grid-template-columns: 1fr;
  }

  .secondary-actions {
    grid-template-columns: 1fr;
  }

  h1 { font-size: clamp(2.35rem, 15vw, 4rem); }
  h2 { font-size: clamp(1.9rem, 11vw, 3.6rem); }
}

@media (min-width: 680px) {
  .controls-panel {
    grid-template-columns: 1fr 150px minmax(230px, 1fr) 170px;
  }

  .controls-heading {
    grid-column: 1 / -1;
  }
}

@media (min-width: 1040px) {
  .app-shell {
    width: min(1240px, 100%);
  }

  main {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(340px, 0.48fr);
    gap: var(--panel-gap);
    align-items: start;
  }

  .controls-panel,
  .exercise-layout {
    grid-column: 1;
  }

  .session-panel,
  .dashboard-panel,
  .summary-panel {
    grid-column: 2;
  }

  .session-panel { margin-top: 0; }
  .dashboard-panel, .summary-panel { margin-top: var(--panel-gap); }
  .exercise-layout { margin-top: var(--panel-gap); }
  .exercise-layout { grid-template-columns: minmax(0, 1fr); }

  .result-card {
    position: sticky;
    top: 18px;
  }

  .controls-panel {
    grid-template-columns: minmax(170px, 0.7fr) minmax(220px, 1fr) 170px auto;
    align-items: end;
  }

  .controls-heading {
    grid-column: 1 / -1;
  }

  .filter-summary {
    justify-self: stretch;
    text-align: left;
  }

  .dashboard-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .dashboard-columns {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 1180px) {
  .hero-copy { max-width: 760px; }
  .exercise-card, .result-card { padding: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
  }
}


/* v0.2.0 — routes and local class mode */
.route-summary,
.class-mode-box {
  grid-column: 1 / -1;
  margin: 0;
  padding: 12px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: var(--surface-muted);
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.45;
}

.route-field select {
  min-width: 100%;
}

.class-mode-box {
  margin-top: 12px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-weight: 800;
  cursor: pointer;
}

.toggle-row input {
  width: 20px;
  height: 20px;
  accent-color: var(--accent);
}

.class-mode-box p {
  margin: 8px 0 0;
  color: var(--ink-soft);
}

#scoreBreakdownText {
  font-size: 0.88rem;
}

body.is-class-mode .session-panel,
body.is-class-mode .summary-panel {
  border-color: color-mix(in srgb, var(--accent) 34%, var(--line-soft));
}

@media (min-width: 680px) {
  .controls-panel {
    grid-template-columns: minmax(150px, 0.8fr) minmax(190px, 1fr) minmax(230px, 1fr) 170px;
  }
}


/* v0.2.2 — Dataset Expansion & Pedagogical Audit */
.diagnostic-panel {
  margin-top: 14px;
  border: 1px solid var(--line-soft, var(--line));
  border-radius: 18px;
  background: var(--surface-muted, rgba(255,255,255,0.55));
  color: var(--ink-soft, var(--ink));
  overflow: hidden;
}

.diagnostic-panel summary {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  cursor: pointer;
  font-weight: 800;
  color: var(--ink);
}

.diagnostic-panel summary small {
  color: var(--muted);
  font-weight: 800;
}

.diagnostic-copy {
  margin: 0;
  padding: 0 14px 12px;
  color: var(--ink-soft, var(--muted));
  font-size: 0.9rem;
  line-height: 1.45;
}

.diagnostic-list,
.qa-checklist {
  display: grid;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0 14px 14px;
}

.diagnostic-list li,
.qa-checklist li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  border: 1px solid var(--line-soft, var(--line));
  border-radius: 14px;
  background: var(--surface-strong);
  padding: 9px 10px;
  color: var(--ink-soft, var(--ink));
  font-size: 0.88rem;
  line-height: 1.35;
}

.diagnostic-list li span,
.qa-checklist li span {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 20px;
  height: 20px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 900;
  background: color-mix(in srgb, var(--success) 14%, transparent);
  color: var(--success);
}

.diagnostic-list li.warn span,
.qa-checklist li.warn span {
  background: color-mix(in srgb, var(--warning) 16%, transparent);
  color: var(--warning);
}

.diagnostic-list li.bad span {
  background: color-mix(in srgb, var(--danger) 16%, transparent);
  color: var(--danger);
}

.diagnostic-list p { margin: 0; }

.qa-checklist-box {
  border-top: 1px solid var(--line-soft, var(--line));
  padding-top: 12px;
}

.qa-checklist-box .hint-label {
  display: block;
  padding: 0 14px 10px;
}

body.is-listening .btn.mic,
body.is-speaking .btn.secondary#listenBtn {
  transform: translateY(-1px);
}

@media (max-width: 520px) {
  .diagnostic-panel summary {
    align-items: flex-start;
    flex-direction: column;
  }
}

.diagnostic-list li p { overflow-wrap: anywhere; }


/* v0.2.3 — Teacher Mode Lite */
.teacher-lite-panel {
  margin-top: 16px;
  padding: 16px;
  display: grid;
  gap: 16px;
  border-color: color-mix(in srgb, var(--accent) 22%, var(--line-soft));
  background: linear-gradient(135deg, color-mix(in srgb, var(--surface) 88%, var(--accent) 12%), var(--surface));
}

.teacher-lite-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.teacher-lite-head h2 {
  margin: 8px 0 8px;
  font-size: clamp(1.18rem, 4.6vw, 1.62rem);
  letter-spacing: -0.04em;
}

.teacher-lite-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.teacher-badge {
  flex: 0 0 auto;
  padding: 8px 10px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--ink-soft);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.02em;
}

.teacher-lite-grid {
  display: grid;
  gap: 12px;
}

.teacher-quick-group {
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line-soft);
  border-radius: 18px;
  background: color-mix(in srgb, var(--surface-muted) 76%, transparent);
}

.chip-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.mini-chip {
  min-height: 38px;
  padding: 8px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 850;
  cursor: pointer;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.mini-chip:hover,
.mini-chip:focus-visible {
  transform: translateY(-1px);
  border-color: color-mix(in srgb, var(--accent) 42%, var(--line-soft));
  outline: none;
}

body.is-class-mode .teacher-lite-panel {
  box-shadow: 0 18px 42px color-mix(in srgb, var(--accent) 14%, transparent);
}

.teacher-actions {
  display: grid;
  gap: 10px;
}

.teacher-status,
.copy-status {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  line-height: 1.45;
}

.homework-note {
  margin-top: 12px !important;
  padding: 12px 14px;
  border: 1px solid color-mix(in srgb, var(--accent) 20%, var(--line-soft));
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--surface-muted) 82%, var(--accent) 8%);
  color: var(--ink-soft) !important;
}

@media (min-width: 720px) {
  .teacher-lite-grid {
    grid-template-columns: minmax(150px, 0.7fr) minmax(0, 1.8fr) minmax(160px, 0.7fr);
  }

  .teacher-actions {
    grid-template-columns: auto auto;
    justify-content: start;
  }
}

@media (min-width: 940px) {
  .summary-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* v0.2.4 — Assignments Local Pack */
.assignment-panel {
  margin-top: 16px;
  padding: 16px;
  display: grid;
  gap: 16px;
  border-color: color-mix(in srgb, var(--success) 18%, var(--line-soft));
  background: linear-gradient(135deg, color-mix(in srgb, var(--surface) 90%, var(--success) 8%), var(--surface));
}

.assignment-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.assignment-head h2 {
  margin: 8px 0 8px;
  font-size: clamp(1.18rem, 4.6vw, 1.62rem);
  letter-spacing: -0.04em;
}

.assignment-head p,
.assignment-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.assignment-grid {
  display: grid;
  gap: 12px;
}

.assignment-card,
.assignment-active-box {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line-soft);
  border-radius: 20px;
  background: color-mix(in srgb, var(--surface-muted) 78%, transparent);
  display: grid;
  gap: 12px;
}

.textarea-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 900;
  color: var(--ink-soft);
  margin-bottom: -6px;
}

.assignment-card textarea {
  width: 100%;
  resize: vertical;
  min-height: 88px;
  border: 1px solid var(--line-soft);
  border-radius: 16px;
  background: var(--surface);
  color: var(--ink);
  padding: 12px 13px;
  font: inherit;
  line-height: 1.45;
}

.assignment-card textarea[readonly] {
  min-height: 108px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.84rem;
  color: var(--ink-soft);
}

.assignment-card textarea:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 28%, transparent);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--line-soft));
}

.assignment-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.assignment-active-box {
  border-color: color-mix(in srgb, var(--accent) 24%, var(--line-soft));
  background: color-mix(in srgb, var(--surface-muted) 84%, var(--accent) 6%);
}

.assignment-active-box h3 {
  margin: 5px 0 6px;
  font-size: clamp(1.05rem, 4vw, 1.35rem);
  letter-spacing: -0.03em;
}

.assignment-active-box p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.assignment-progress-wrap {
  display: grid;
  gap: 8px;
}

.assignment-progress-wrap strong {
  color: var(--ink);
  font-size: 1.18rem;
}

.assignment-progress-wrap progress {
  width: 100%;
  height: 12px;
  accent-color: var(--accent);
}

@media (min-width: 820px) {
  .assignment-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }

  .assignment-active-box {
    grid-template-columns: minmax(0, 1.35fr) minmax(170px, 0.45fr) auto;
    align-items: center;
  }
}

@media (max-width: 640px) {
  .assignment-head {
    flex-direction: column;
  }

  .assignment-actions .btn {
    width: 100%;
  }
}

/* v0.3.0 — PWA & Architecture Polish */
.pwa-status-panel {
  margin: 14px 0 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: color-mix(in srgb, var(--surface-strong) 88%, var(--accent-soft) 12%);
  box-shadow: 0 14px 42px rgba(16, 24, 38, 0.08);
  padding: 13px 14px;
}

.pwa-status-panel[hidden] {
  display: none;
}

.pwa-status-panel[data-tone="update"] {
  border-color: color-mix(in srgb, var(--warm) 36%, var(--line));
  background: color-mix(in srgb, var(--surface-strong) 82%, #fff2d8 18%);
}

.pwa-status-panel[data-tone="offline"] {
  border-color: color-mix(in srgb, var(--warning) 34%, var(--line));
  background: color-mix(in srgb, var(--surface-strong) 82%, #fff7e6 18%);
}

.pwa-status-panel[data-tone="ready"] {
  border-color: color-mix(in srgb, var(--success) 28%, var(--line));
  background: color-mix(in srgb, var(--surface-strong) 84%, #eaf7ef 16%);
}

.pwa-status-copy {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  min-width: 0;
}

.pwa-status-copy strong {
  display: block;
  margin: 0 0 3px;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
}

.pwa-status-copy p {
  margin: 0;
  color: var(--muted);
  line-height: 1.42;
  font-size: 0.92rem;
}

.pwa-status-badge {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 5px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.pwa-status-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
}

.compact-btn {
  min-height: 40px;
  padding-inline: 14px;
  font-size: 0.9rem;
}

@media (max-width: 720px) {
  .pwa-status-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .pwa-status-actions {
    width: 100%;
  }

  .pwa-status-actions .btn {
    flex: 1 1 0;
  }
}