.app-nav {
  display: flex;
  align-items: stretch;
  gap: 4px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.app-nav button {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 7px;
  padding: 0 13px;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transition: background 150ms ease, color 150ms ease, transform 150ms ease;
}

.app-nav button:hover {
  background: rgba(255, 253, 248, 0.72);
  color: var(--ink);
  transform: translateY(-1px);
}

.app-nav button.active {
  border-color: var(--ink);
  background: var(--ink);
  color: white;
}

.app-nav svg {
  width: 16px;
  fill: currentColor;
}

.app-view[hidden] {
  display: none !important;
}

.feature-page {
  padding: 50px 0 10px;
}

.feature-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 32px;
  align-items: end;
  margin-bottom: 28px;
  padding: 4px 3px 28px;
  border-bottom: 1px solid var(--line);
}

.feature-hero h1 {
  max-width: 760px;
  margin: 9px 0 8px;
  font-family: var(--serif);
  font-size: clamp(38px, 5.2vw, 62px);
  font-weight: 500;
  letter-spacing: -0.05em;
  line-height: 0.98;
}

.feature-hero h1 em {
  color: var(--moss);
  font-weight: 500;
}

.feature-hero > div > p:last-child {
  max-width: 620px;
  margin: 0;
  color: var(--ink-soft);
  font-size: 13px;
  line-height: 1.55;
}

.hero-progress {
  min-width: 170px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 4px 4px 0 rgba(23, 35, 45, 0.08);
}

.hero-progress strong {
  display: block;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 500;
}

.hero-progress span {
  color: var(--ink-soft);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.feature-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  padding: 14px 17px;
  border: 1px solid var(--ink);
  border-radius: 8px;
  background: var(--ink);
  color: white;
}

.feature-strip p {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  font-style: italic;
}

.feature-strip span {
  color: rgba(255, 255, 255, 0.62);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.lesson-grid,
.puzzle-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.lesson-card,
.puzzle-card,
.mode-card,
.gym-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: 4px 5px 0 rgba(23, 35, 45, 0.08);
  overflow: hidden;
}

.lesson-card {
  display: flex;
  min-height: 290px;
  flex-direction: column;
  padding: 21px;
}

.lesson-card::before,
.puzzle-card::before,
.mode-card::before {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 4px;
  background: var(--moss);
  content: "";
}

.lesson-card.completed::before,
.puzzle-card.solved::before {
  background: var(--ochre);
}

.card-meta-row,
.puzzle-meta,
.lesson-modal-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.lesson-index {
  color: var(--coral);
  font-family: var(--serif);
  font-size: 23px;
  font-style: italic;
}

.skill-tag,
.difficulty-tag,
.complete-tag {
  display: inline-flex;
  padding: 5px 7px;
  border-radius: 999px;
  background: var(--moss-pale);
  color: var(--moss-deep);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.complete-tag {
  background: var(--ochre-pale);
  color: #76500f;
}

.lesson-card h2,
.puzzle-card h2,
.mode-card h2,
.gym-card h2 {
  margin: 18px 0 7px;
  font-family: var(--serif);
  font-size: 23px;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.lesson-card > p,
.puzzle-card > p,
.mode-card > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.5;
}

.lesson-concepts {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin: 15px 0;
}

.lesson-concepts span {
  padding: 4px 6px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--ink-soft);
  font-size: 9px;
}

.card-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.card-action-row small {
  color: var(--ink-soft);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.compact-button {
  padding: 7px 11px;
  border: 1px solid var(--ink);
  border-radius: 4px;
  background: var(--ink);
  color: white;
  font-size: 9px;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.puzzle-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 18px;
}

.filter-tabs {
  display: flex;
  max-width: 100%;
  gap: 4px;
  padding: 3px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-muted);
  overflow-x: auto;
}

.filter-tabs button {
  padding: 7px 11px;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 900;
  text-transform: uppercase;
}

.filter-tabs button.active {
  background: var(--surface);
  color: var(--ink);
  box-shadow: 1px 2px 0 rgba(23, 35, 45, 0.1);
}

.puzzle-card {
  min-height: 255px;
  padding: 20px;
}

.puzzle-card h2 {
  margin-top: 14px;
  font-size: 20px;
}

.puzzle-card .card-action-row {
  position: absolute;
  right: 20px;
  bottom: 17px;
  left: 20px;
}

.mini-board {
  display: grid;
  gap: 3px;
  margin: 15px 0 58px;
}

.mini-board-row {
  display: flex;
  gap: 3px;
}

.mini-board-tile {
  display: grid;
  width: 25px;
  height: 25px;
  place-items: center;
  border-radius: 3px;
  background: var(--slate);
  color: white;
  font-family: var(--serif);
  font-size: 10px;
  font-weight: 700;
}

.mini-board-tile.correct { background: var(--moss); }
.mini-board-tile.present { background: var(--ochre); }
.mini-board-tile.absent { background: var(--slate); }

.academy-modal {
  width: min(760px, calc(100% - 28px));
}

.lesson-modal-header,
.puzzle-modal-header {
  padding: 4px 34px 20px 0;
  border-bottom: 1px solid var(--line);
}

.lesson-modal-header h2,
.puzzle-modal-header h2 {
  margin: 8px 0;
  font-size: clamp(30px, 5vw, 45px);
}

.lesson-modal-header > p,
.puzzle-modal-header > p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.6;
}

.lesson-section {
  display: grid;
  grid-template-columns: 170px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.lesson-section h3,
.checkpoint-card h3,
.scenario-card h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
}

.lesson-section p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.65;
}

.lesson-example {
  margin: 18px 0;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--surface-muted);
}

.lesson-example strong {
  display: block;
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 500;
}

.checkpoint-card,
.scenario-card {
  margin-top: 20px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-muted);
}

.checkpoint-progress {
  margin-bottom: 9px;
  color: var(--coral);
  font-size: 8px;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.choice-list {
  display: grid;
  gap: 7px;
  margin-top: 15px;
}

.choice-button {
  display: grid;
  grid-template-columns: 24px 1fr;
  gap: 9px;
  align-items: center;
  width: 100%;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface);
  text-align: left;
}

.choice-button:hover { border-color: var(--moss); }
.choice-button.correct { border-color: var(--moss); background: var(--moss-pale); }
.choice-button.wrong { border-color: var(--coral); background: var(--coral-pale); }

.choice-letter {
  display: grid;
  width: 23px;
  height: 23px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: white;
  font-family: var(--serif);
  font-size: 11px;
}

.choice-button strong { font-size: 11px; }
.choice-button small { display: block; margin-top: 2px; color: var(--ink-soft); font-size: 10px; }

.answer-feedback {
  margin-top: 12px;
  padding: 11px;
  border-left: 3px solid var(--moss);
  background: var(--moss-pale);
  color: var(--moss-deep);
  font-family: var(--serif);
  font-size: 12px;
  line-height: 1.5;
}

.gym-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.gym-card {
  padding: 20px;
}

.gym-card.span-4 { grid-column: span 4; }
.gym-card.span-5 { grid-column: span 5; }
.gym-card.span-7 { grid-column: span 7; }
.gym-card.span-8 { grid-column: span 8; }
.gym-card.span-12 { grid-column: span 12; }

.metric-value {
  display: block;
  margin-top: 8px;
  font-family: var(--serif);
  font-size: 38px;
  font-weight: 500;
  letter-spacing: -0.04em;
}

.metric-caption {
  color: var(--ink-soft);
  font-size: 10px;
  line-height: 1.4;
}

.mastery-list,
.activity-list {
  display: grid;
  gap: 10px;
  margin-top: 15px;
}

.mastery-row {
  display: grid;
  grid-template-columns: 120px 1fr 35px;
  gap: 10px;
  align-items: center;
  font-size: 9px;
  font-weight: 800;
}

.mastery-track {
  height: 7px;
  border-radius: 999px;
  background: var(--surface-muted);
  overflow: hidden;
}

.mastery-track span {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--moss);
}

.recommendation-card {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  gap: 14px;
  align-items: center;
  margin-bottom: 14px;
  padding: 17px;
  border: 1px solid var(--ochre);
  border-radius: 8px;
  background: var(--ochre-pale);
}

.recommendation-icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 50%;
  background: var(--surface);
  color: var(--ochre);
  font-family: var(--serif);
  font-size: 22px;
  font-style: italic;
}

.recommendation-card h3 { margin: 0 0 4px; font-family: var(--serif); font-size: 18px; font-weight: 500; }
.recommendation-card p { margin: 0; color: #69532b; font-size: 10px; }

.activity-item {
  display: grid;
  grid-template-columns: 30px 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 9px 0;
  border-top: 1px solid var(--line);
}

.activity-glyph {
  display: grid;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  background: var(--moss-pale);
  color: var(--moss);
  font-family: var(--serif);
  font-size: 12px;
}

.activity-item strong { display: block; font-size: 10px; }
.activity-item small { color: var(--ink-soft); font-size: 9px; }

.versus-lobby-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.mode-card {
  min-height: 355px;
  padding: 25px;
}

.mode-card.bot::before { background: var(--coral); }

.mode-icon {
  display: grid;
  width: 56px;
  height: 56px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--surface-muted);
  font-family: var(--serif);
  font-size: 25px;
  font-style: italic;
}

.bot-levels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
  margin: 18px 0;
}

.bot-level-button {
  padding: 10px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--surface-muted);
  font-size: 9px;
  font-weight: 900;
  text-transform: uppercase;
}

.bot-level-button.active {
  border-color: var(--moss);
  background: var(--moss-pale);
  color: var(--moss-deep);
}

.bot-description {
  min-height: 54px;
  padding: 11px;
  border-left: 2px solid var(--moss);
  background: var(--moss-pale);
  color: var(--moss-deep);
  font-size: 10px;
  line-height: 1.45;
}

.mode-card .primary-button { position: absolute; right: 25px; bottom: 24px; left: 25px; }

.match-shell {
  padding: 38px 0 8px;
}

.match-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 14px;
  padding: 13px 16px;
  border-radius: 8px;
  background: var(--ink);
  color: white;
}

.match-topbar h1 { margin: 0; font-family: var(--serif); font-size: 21px; font-weight: 500; }
.match-status { color: rgba(255,255,255,.68); font-size: 9px; font-weight: 800; text-transform: uppercase; }

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

.duel-player-card {
  position: relative;
  min-height: 520px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.duel-player-card.active { border-color: var(--moss); }
.duel-player-card.winner { box-shadow: 5px 6px 0 rgba(52,118,90,.25); }

.duel-player-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.duel-player-head h2 { margin: 0; font-family: var(--serif); font-size: 19px; font-weight: 500; }
.duel-player-head span { color: var(--ink-soft); font-size: 8px; font-weight: 900; text-transform: uppercase; }

.duel-board {
  display: grid;
  width: min(100%, 275px);
  gap: 5px;
  margin: 18px auto;
}

.duel-row { display: grid; grid-template-columns: repeat(5, 1fr); gap: 5px; }

.duel-tile {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #fbf9f3;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 700;
}

.duel-tile.filled { border-color: var(--ink-soft); }
.duel-tile.correct,.duel-tile.present,.duel-tile.absent { border-color: transparent; }
.duel-tile.correct { background: var(--moss); }
.duel-tile.present { background: var(--ochre); color: var(--ink); }
.duel-tile.absent { background: var(--slate); }
.duel-tile.correct,.duel-tile.absent { color: white; }
.duel-tile.masked {
  font-family: var(--sans);
  font-size: 15px;
  font-weight: 900;
  text-transform: none;
}

.duel-thinking {
  display: flex;
  min-height: 28px;
  align-items: center;
  justify-content: center;
  color: var(--ink-soft);
  font-family: var(--serif);
  font-size: 11px;
  font-style: italic;
}

.thinking-dots::after { content: ""; animation: thinking 1.2s steps(4,end) infinite; }
@keyframes thinking { 0%{content:""} 25%{content:"."} 50%{content:".."} 75%,100%{content:"..."} }

.duel-keyboard-wrap {
  margin-top: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.duel-keyboard { display: grid; max-width: 650px; gap: 6px; margin: 0 auto; }
.duel-keyboard .key { flex: 1; }

.opponent-board-note {
  width: fit-content;
  margin: -6px auto 4px;
  padding: 5px 8px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--ink-soft);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.pass-overlay {
  position: fixed;
  z-index: 30;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(23,35,45,.88);
  backdrop-filter: blur(4px);
}

.pass-card {
  width: min(390px, 100%);
  padding: 30px;
  border-radius: 10px;
  background: var(--paper);
  box-shadow: 8px 9px 0 rgba(0,0,0,.2);
  text-align: center;
}

.pass-card h2 { margin: 8px 0; font-family: var(--serif); font-size: 31px; font-weight: 500; }
.pass-card p { color: var(--ink-soft); font-size: 11px; }

.match-result-banner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 15px;
  align-items: center;
  margin-bottom: 14px;
  padding: 17px;
  border: 1px solid var(--moss);
  border-radius: 8px;
  background: var(--moss-pale);
}

.match-result-banner h2 { margin: 0; font-family: var(--serif); font-size: 23px; font-weight: 500; }
.match-result-banner p { margin: 3px 0 0; color: var(--moss-deep); font-size: 10px; }

.match-result-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
}

.match-analysis-report {
  margin-bottom: 14px;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.analysis-header,
.analysis-player-head,
.analysis-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
}

.analysis-header { margin-bottom: 16px; }
.analysis-header h2 {
  margin: 5px 0 0;
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 500;
}
.analysis-header p {
  width: min(460px, 100%);
  margin: 0;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.5;
}

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

.analysis-player {
  min-width: 0;
  padding: 17px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-muted);
}
.analysis-player-head { align-items: center; }
.analysis-player-head h3 {
  margin: 3px 0 0;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 500;
}
.analysis-kicker,
.analysis-focus span,
.analysis-alternative span {
  color: var(--ink-soft);
  font-size: 9px;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.analysis-grade,
.analysis-mini-grade {
  display: inline-grid;
  place-items: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-weight: 900;
}
.analysis-grade { width: 38px; height: 38px; font-size: 16px; }
.analysis-mini-grade { width: 22px; height: 22px; margin-right: 4px; font-size: 8px; }
.grade-a { color: var(--moss-deep); background: var(--moss-pale); }
.grade-b { color: #78601e; background: var(--ochre-pale); }
.grade-c { color: var(--ink-soft); background: #e4e7e8; }
.grade-d { color: var(--ink); background: var(--paper-deep); }
.grade-neutral { color: var(--ink-soft); background: var(--surface); }

.analysis-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin: 14px 0;
}
.analysis-metric {
  min-width: 0;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface);
}
.analysis-metric span { display: block; color: var(--ink-soft); font-size: 9px; text-transform: uppercase; }
.analysis-metric strong { display: block; margin-top: 4px; font-size: 12px; line-height: 1.3; }

.analysis-section { margin-top: 15px; }
.analysis-section-head { align-items: baseline; margin-bottom: 6px; }
.analysis-section h4,
.analysis-coaching h4 {
  margin: 0;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 600;
}
.analysis-section-head span { color: var(--ink-soft); font-size: 10px; }
.analysis-table-wrap { overflow-x: auto; }
.analysis-table { width: 100%; border-collapse: collapse; background: var(--surface); font-size: 11px; }
.analysis-table th,
.analysis-table td { padding: 8px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
.analysis-table thead th { color: var(--ink-soft); font-size: 9px; letter-spacing: .07em; text-transform: uppercase; }
.analysis-table tbody th { font-size: 12px; letter-spacing: .08em; }
.analysis-table tbody tr:last-child th,
.analysis-table tbody tr:last-child td { border-bottom: 0; }
.analysis-empty { margin: 0; padding: 10px; background: var(--surface); color: var(--ink-soft); font-size: 11px; }
.analysis-legend { margin: 7px 0 0; color: var(--ink-soft); font-size: 10px; line-height: 1.4; }

.analysis-coaching {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}
.analysis-coaching > div { padding: 11px; border: 1px solid var(--line); border-radius: 6px; background: var(--surface); }
.analysis-list { display: grid; gap: 6px; margin: 8px 0 0; padding: 0; list-style: none; }
.analysis-list li { position: relative; padding-left: 14px; color: var(--ink-soft); font-size: 11px; line-height: 1.45; }
.analysis-list li::before { position: absolute; left: 0; top: .05em; font-weight: 900; }
.analysis-list.positive li::before { content: "\2713"; color: var(--moss); }
.analysis-list.improve li::before { content: "\2192"; color: var(--ochre); }

.analysis-alternative,
.analysis-focus {
  margin-top: 10px;
  padding: 11px 12px;
  border-left: 3px solid var(--ochre);
  background: var(--ochre-pale);
}
.analysis-alternative strong { display: block; margin: 4px 0 2px; font-size: 12px; letter-spacing: .05em; }
.analysis-alternative p,
.analysis-focus p { margin: 0; color: var(--ink-soft); font-size: 11px; line-height: 1.45; }
.analysis-focus { border-left-color: var(--ink); background: var(--paper-deep); }
.analysis-focus.reinforce { border-left-color: var(--moss); background: var(--moss-pale); }
.analysis-focus span { color: var(--ink); }

@media (max-width: 900px) {
  .lesson-grid,.puzzle-grid { grid-template-columns: repeat(2, minmax(0,1fr)); }
  .gym-card.span-4,.gym-card.span-5,.gym-card.span-7,.gym-card.span-8 { grid-column: span 6; }
  .duel-arena { grid-template-columns: 1fr; }
  .duel-player-card { min-height: 470px; }
  .analysis-grid { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .app-nav { margin-right: -10px; margin-left: -10px; padding: 8px 10px; overflow-x: auto; }
  .app-nav button { min-width: 83px; justify-content: center; padding: 0 8px; }
  .app-nav svg { display: none; }
  .feature-page { padding-top: 35px; }
  .feature-hero { grid-template-columns: 1fr; gap: 14px; }
  .hero-progress { min-width: 0; }
  .lesson-grid,.puzzle-grid,.versus-lobby-grid { grid-template-columns: 1fr; }
  .puzzle-toolbar { align-items: stretch; }
  .filter-tabs { width: 100%; }
  .lesson-section { grid-template-columns: 1fr; gap: 7px; }
  .gym-card.span-4,.gym-card.span-5,.gym-card.span-7,.gym-card.span-8,.gym-card.span-12 { grid-column: span 12; }
  .recommendation-card { grid-template-columns: 42px 1fr; }
  .recommendation-card .compact-button { grid-column: 1 / -1; }
  .mastery-row { grid-template-columns: 92px 1fr 30px; }
  .duel-player-card { min-height: 430px; padding: 14px; }
  .duel-board { width: min(100%,245px); }
  .duel-tile { font-size: 19px; }
  .duel-keyboard-wrap { padding: 12px 5px; }
  .match-result-banner { grid-template-columns: 1fr; }
  .match-result-actions { justify-content: flex-start; }
  .analysis-header { display: grid; gap: 8px; }
  .analysis-summary { grid-template-columns: 1fr; }
  .analysis-coaching { grid-template-columns: 1fr; }
}