:root {
  --bg-cream: #fff7ef;
  --bg-mint: #eaf7f3;
  --card: rgba(255, 255, 255, 0.82);
  --card-strong: rgba(255, 255, 255, 0.96);
  --ink: #173040;
  --ink-soft: #48616f;
  --coral: #f46d52;
  --coral-soft: rgba(244, 109, 82, 0.16);
  --mint: #2a9d8f;
  --mint-soft: rgba(42, 157, 143, 0.16);
  --sand: #e6b85c;
  --sand-soft: rgba(230, 184, 92, 0.2);
  --ink-accent: #25485f;
  --ink-soft-fill: rgba(37, 72, 95, 0.1);
  --danger: #d1495b;
  --danger-soft: rgba(209, 73, 91, 0.12);
  --shadow: 0 24px 60px rgba(52, 81, 102, 0.14);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --border: rgba(23, 48, 64, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Trebuchet MS", "Gill Sans", "Verdana", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(244, 109, 82, 0.18), transparent 32%),
    radial-gradient(circle at right 15% top 20%, rgba(42, 157, 143, 0.18), transparent 28%),
    linear-gradient(145deg, var(--bg-cream), var(--bg-mint));
  overflow-x: hidden;
}

button,
textarea {
  font: inherit;
}

.background-orb,
.background-grid {
  position: fixed;
  inset: auto;
  pointer-events: none;
}

.background-orb {
  width: 28rem;
  height: 28rem;
  border-radius: 999px;
  filter: blur(42px);
  opacity: 0.38;
}

.orb-a {
  top: -10rem;
  right: -7rem;
  background: rgba(244, 109, 82, 0.36);
}

.orb-b {
  bottom: -10rem;
  left: -6rem;
  background: rgba(42, 157, 143, 0.25);
}

.background-grid {
  inset: 0;
  background-image:
    linear-gradient(rgba(23, 48, 64, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 48, 64, 0.04) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.5), transparent 90%);
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1240px, calc(100% - 32px));
  margin: 28px auto 44px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow);
  border-radius: var(--radius-lg);
}

.reveal {
  animation: rise-in 0.7s ease both;
}

.reveal:nth-child(2) {
  animation-delay: 0.08s;
}

.reveal:nth-child(3) {
  animation-delay: 0.16s;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 12px;
  margin-bottom: 24px;
}

.page-nav-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.72rem 1rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.75);
  transition:
    transform 0.18s ease,
    background 0.18s ease,
    color 0.18s ease;
}

.page-nav-link:hover {
  transform: translateY(-1px);
}

.page-nav-link.is-current {
  background: var(--ink);
  color: #ffffff;
}

.hero {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 24px;
  padding: 30px;
  margin-bottom: 24px;
}

.eyebrow,
.section-label,
.setting-label,
.tile-label,
.metric-label,
.attempt-label,
.mode-stat-label,
.bank-caption {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.72rem;
  color: var(--ink-soft);
}

h1,
h2,
h3 {
  margin: 0;
  font-family: "Palatino Linotype", "Book Antiqua", "Georgia", serif;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.2rem, 4vw, 3.6rem);
  line-height: 0.96;
}

h2 {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1;
}

h3 {
  font-size: 1.2rem;
}

.hero-text,
.metric-detail,
.focus-caption,
.tile-foot,
.feedback-message,
.layout-hint,
.setting-note,
.english-gloss,
.bank-english,
.result-body,
.result-line,
.focus-meta {
  color: var(--ink-soft);
}

.hero-text {
  max-width: 52ch;
  font-size: 1.05rem;
  line-height: 1.55;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 700;
  cursor: pointer;
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    background 0.18s ease,
    opacity 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(1px);
}

.button:disabled {
  cursor: not-allowed;
  transform: none;
  opacity: 0.5;
  box-shadow: none;
}

.button-primary {
  background: linear-gradient(135deg, var(--coral), #ff9068);
  color: white;
  box-shadow: 0 14px 28px rgba(244, 109, 82, 0.26);
}

.button-secondary {
  background: linear-gradient(135deg, var(--mint), #52b7ab);
  color: white;
  box-shadow: 0 14px 28px rgba(42, 157, 143, 0.24);
}

.button-ghost {
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink);
}

.button-danger {
  background: var(--danger-soft);
  color: var(--danger);
}

.hero-metrics {
  display: grid;
  gap: 16px;
}

.metric-block,
.setting-card,
.result-card,
.mode-stat-card,
.bank-item,
.focus-item {
  border-radius: var(--radius-md);
  background:
    linear-gradient(160deg, rgba(255, 255, 255, 0.84), rgba(255, 255, 255, 0.58)),
    rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(23, 48, 64, 0.08);
}

.metric-block {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 10px;
  padding: 22px;
}

.metric-block strong {
  font-size: 1.35rem;
}

.top-grid,
.bottom-grid {
  display: grid;
  gap: 24px;
  margin-bottom: 24px;
}

.top-grid {
  grid-template-columns: 1.08fr 0.92fr;
}

.bottom-grid {
  grid-template-columns: 0.95fr 1.05fr;
}

.practice,
.session,
.mode-scoreboard,
.sentence-bank {
  padding: 24px;
}

.practice-header,
.session-header,
.panel-header,
.prompt-meta {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.status-pill,
.countdown-pill,
.session-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 36px;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.92rem;
}

.status-pill.idle,
.countdown-pill {
  background: rgba(37, 72, 95, 0.08);
  color: var(--ink-accent);
}

.status-pill.preview {
  background: var(--sand-soft);
  color: #8e650f;
}

.status-pill.typing {
  background: var(--mint-soft);
  color: #1b6e66;
}

.status-pill.paused {
  background: rgba(37, 72, 95, 0.1);
  color: var(--ink-accent);
}

.status-pill.review {
  background: var(--coral-soft);
  color: #b84833;
}

.session-badge {
  background: rgba(255, 255, 255, 0.8);
  color: var(--ink-accent);
}

.control-stack {
  display: grid;
  gap: 16px;
  margin-top: 22px;
}

.mode-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.mode-chip {
  border: 0;
  min-height: 44px;
  padding: 0.8rem 1rem;
  border-radius: 999px;
  background: rgba(37, 72, 95, 0.08);
  color: var(--ink-soft);
  font-weight: 700;
}

.mode-chip.is-active {
  background: linear-gradient(135deg, rgba(244, 109, 82, 0.18), rgba(42, 157, 143, 0.2));
  color: var(--ink);
  box-shadow: inset 0 0 0 1px rgba(23, 48, 64, 0.08);
}

.settings-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.setting-card {
  display: grid;
  gap: 8px;
  padding: 16px;
}

.setting-value {
  font-size: 1.2rem;
}

.stepper {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.stepper strong {
  min-width: 2ch;
  text-align: center;
  font-size: 1.1rem;
}

.stepper-button {
  width: 38px;
  height: 38px;
  border: 0;
  border-radius: 999px;
  background: rgba(37, 72, 95, 0.08);
  color: var(--ink);
  font-size: 1.25rem;
  line-height: 1;
}

.stepper-button:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.prompt-stage {
  margin-top: 20px;
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(23, 48, 64, 0.08);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.66));
}

.prompt-stage.preview {
  box-shadow: inset 0 0 0 1px rgba(230, 184, 92, 0.24);
}

.prompt-stage.typing {
  box-shadow: inset 0 0 0 1px rgba(42, 157, 143, 0.2);
}

.prompt-stage.review {
  box-shadow: inset 0 0 0 1px rgba(244, 109, 82, 0.2);
}

.english-gloss {
  margin: 0.65rem 0 0;
  font-size: 0.98rem;
}

.sentence-display {
  margin-top: 14px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.4;
  min-height: 4.4rem;
  font-family: "Palatino Linotype", "Book Antiqua", "Georgia", serif;
}

.sentence-display .token-highlight {
  color: var(--coral);
}

.masked-word {
  display: inline-block;
  width: calc(var(--letters) * 0.62ch + 1rem);
  height: 0.78em;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(37, 72, 95, 0.16), rgba(37, 72, 95, 0.08)),
    rgba(37, 72, 95, 0.08);
  vertical-align: -0.05em;
}

.hidden-words-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.hidden-chip {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(42, 157, 143, 0.14);
  color: #1d6f67;
  font-weight: 700;
}

.hidden {
  display: none;
}

.input-label {
  display: block;
  margin-top: 20px;
  font-weight: 700;
}

.sentence-input {
  width: 100%;
  min-height: 110px;
  margin-top: 10px;
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid rgba(23, 48, 64, 0.12);
  background: rgba(255, 255, 255, 0.84);
  color: var(--ink);
  resize: vertical;
}

.sentence-input:focus {
  outline: 2px solid rgba(42, 157, 143, 0.24);
  outline-offset: 2px;
}

.sentence-input:disabled {
  opacity: 0.68;
}

.attempt-strip {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.attempt-stat {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(23, 48, 64, 0.08);
}

.attempt-stat strong {
  display: block;
  font-size: 1.2rem;
}

.practice-feedback {
  margin-top: 16px;
}

.feedback-message,
.layout-hint {
  margin: 0;
  line-height: 1.5;
}

.layout-hint {
  margin-top: 6px;
  color: var(--danger);
}

.practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.result-card {
  margin-top: 18px;
  padding: 18px;
}

.result-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
}

.result-body,
.result-line {
  margin: 0.75rem 0 0;
  line-height: 1.5;
}

.result-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.result-metric {
  padding: 12px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.7);
}

.result-metric span {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.result-metric strong {
  display: block;
  margin-top: 6px;
  font-size: 1.05rem;
}

.stats-grid,
.mode-stats-grid,
.sentence-bank-grid {
  display: grid;
  gap: 14px;
}

.stats-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 18px;
}

.stat-tile {
  padding: 18px;
  border-radius: var(--radius-md);
  color: var(--ink);
}

.accent-coral {
  background: linear-gradient(160deg, rgba(244, 109, 82, 0.2), rgba(255, 255, 255, 0.92));
}

.accent-mint {
  background: linear-gradient(160deg, rgba(42, 157, 143, 0.18), rgba(255, 255, 255, 0.92));
}

.accent-sand {
  background: linear-gradient(160deg, rgba(230, 184, 92, 0.24), rgba(255, 255, 255, 0.92));
}

.accent-ink {
  background: linear-gradient(160deg, rgba(37, 72, 95, 0.16), rgba(255, 255, 255, 0.92));
}

.stat-tile strong {
  display: block;
  font-size: 1.35rem;
}

.focus-panel {
  margin-top: 18px;
}

.focus-sentences {
  display: grid;
  gap: 12px;
  margin-top: 14px;
}

.focus-item {
  padding: 14px 16px;
}

.focus-item strong,
.bank-item strong,
.mode-stat-card h3 {
  display: block;
}

.focus-meta {
  margin-top: 6px;
  font-size: 0.94rem;
}

.mode-stats-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 18px;
}

.mode-stat-card {
  padding: 18px;
}

.mode-stat-card.is-current {
  box-shadow: inset 0 0 0 1px rgba(42, 157, 143, 0.24);
}

.mode-stat-rows {
  display: grid;
  gap: 10px;
  margin-top: 14px;
}

.mode-stat-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.sentence-bank-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 18px;
}

.bank-item {
  padding: 16px;
}

.bank-item.is-current {
  box-shadow: inset 0 0 0 1px rgba(244, 109, 82, 0.24);
}

.bank-item.is-seen {
  background:
    linear-gradient(160deg, rgba(42, 157, 143, 0.08), rgba(255, 255, 255, 0.7)),
    rgba(255, 255, 255, 0.6);
}

.bank-russian {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.4;
  font-family: "Palatino Linotype", "Book Antiqua", "Georgia", serif;
}

.bank-english {
  margin: 0.55rem 0 0;
  line-height: 1.45;
}

.bank-score {
  margin-top: 0.8rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
}

@keyframes rise-in {
  from {
    transform: translateY(14px);
    opacity: 0;
  }

  to {
    transform: translateY(0);
    opacity: 1;
  }
}

@media (max-width: 1080px) {
  .hero,
  .top-grid,
  .bottom-grid {
    grid-template-columns: 1fr;
  }

  .mode-stats-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 20px, 1240px);
    margin-top: 20px;
  }

  .hero,
  .practice,
  .session,
  .mode-scoreboard,
  .sentence-bank {
    padding: 20px;
  }

  .stats-grid,
  .settings-row,
  .attempt-strip {
    grid-template-columns: 1fr;
  }

  .sentence-display {
    font-size: 1.25rem;
  }
}