:root {
  --bg: #020202;
  --bg-accent: rgba(108, 245, 202, 0.1);
  --bg-violet: rgba(132, 156, 255, 0.1);
  --panel: rgba(12, 12, 15, 0.96);
  --panel-soft: rgba(18, 18, 22, 0.92);
  --panel-strong: rgba(7, 7, 9, 0.98);
  --line: rgba(255, 255, 255, 0.08);
  --line-strong: rgba(255, 255, 255, 0.12);
  --ink: #f3f5f7;
  --muted: #95a0b1;
  --muted-strong: #c5ccd7;
  --accent: #6cf5ca;
  --accent-strong: #0bc79e;
  --accent-soft: rgba(108, 245, 202, 0.12);
  --violet: #8b9dff;
  --violet-soft: rgba(139, 157, 255, 0.14);
  --danger: #ff8b7d;
  --danger-soft: rgba(255, 139, 125, 0.14);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
  --app-max-width: 1440px;
  --app-height: 100dvh;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  overscroll-behavior: none;
}

html {
  color-scheme: dark;
}

body {
  font-family: "SF Pro Display", "Avenir Next", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, var(--bg-accent), transparent 22%),
    radial-gradient(circle at top right, var(--bg-violet), transparent 24%),
    linear-gradient(180deg, #010101 0%, #040404 52%, #020202 100%);
}

button,
input {
  font: inherit;
}

.viewport {
  width: 100vw;
  height: var(--app-height);
  overflow: hidden;
  padding:
    max(8px, env(safe-area-inset-top))
    max(8px, env(safe-area-inset-right))
    max(8px, env(safe-area-inset-bottom))
    max(8px, env(safe-area-inset-left));
}

.app-stage {
  width: min(100%, var(--app-max-width));
  height: 100%;
  margin: 0 auto;
}

.app-frame {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  gap: clamp(8px, 0.8vw, 12px);
  width: 100%;
  height: 100%;
  padding: clamp(6px, 0.8vw, 12px);
}

.top-area {
  display: block;
}

.topbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  color: var(--ink);
  text-decoration: none;
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-size: clamp(1.3rem, 2vw, 1.7rem);
  line-height: 1;
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.library-nav {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.library-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.045);
  color: var(--muted-strong);
  text-decoration: none;
  font-size: 0.78rem;
  font-weight: 700;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease, color 140ms ease;
}

.library-link:hover {
  transform: translateY(-1px);
  color: var(--accent);
  border-color: rgba(108, 245, 202, 0.2);
  background: rgba(108, 245, 202, 0.08);
}

.mini-metric,
.summary-card,
.score-box div {
  min-width: 0;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(19, 19, 23, 0.98), rgba(10, 10, 13, 0.98));
  box-shadow: var(--shadow);
}

.mini-metric {
  display: grid;
  align-content: center;
  gap: 4px;
  min-height: clamp(68px, 8vh, 88px);
  padding: clamp(12px, 1vw, 16px);
}

.mini-metric.accent {
  background:
    linear-gradient(180deg, rgba(12, 25, 21, 0.98), rgba(7, 11, 10, 0.98)),
    var(--accent-soft);
  border-color: rgba(108, 245, 202, 0.18);
}

.mini-metric.status {
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 8px 14px;
}

.mini-metric.status strong {
  font-size: clamp(1.1rem, 1.6vw, 1.55rem);
}

.metric-label,
.section-kicker,
.summary-card span,
.score-box span,
.word-label {
  text-transform: uppercase;
  letter-spacing: 0.11em;
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--muted);
}

.mini-metric strong,
.summary-card strong,
.score-box strong {
  font-size: clamp(1.15rem, 1.7vw, 1.75rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.mini-metric small {
  color: var(--muted);
  font-size: 0.8rem;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(320px, 410px) minmax(0, 1fr);
  gap: clamp(10px, 1vw, 16px);
  min-height: 0;
}

.panel {
  min-height: 0;
  border-radius: 30px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.control-panel {
  display: grid;
  grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(8px, 0.8vw, 10px);
}

.mobile-panel-switcher {
  display: none;
}

.panel-section {
  min-height: 0;
  padding: clamp(10px, 0.9vw, 14px);
  border-radius: 28px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(16, 16, 20, 0.98), rgba(9, 9, 12, 0.98));
  overflow: auto;
  scrollbar-width: none;
}

.panel-section::-webkit-scrollbar,
.flashcard-panel::-webkit-scrollbar {
  display: none;
}

.panel-section.compact {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 10px;
}

.section-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.section-kicker {
  margin: 0 0 0.35rem;
  color: var(--accent);
}

.panel-section h2 {
  margin: 0;
  font-size: 1.2rem;
  letter-spacing: -0.03em;
}

.session-form {
  display: grid;
  gap: 10px;
}

.field,
.field-group {
  display: block;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.field-label {
  display: block;
  margin-bottom: 0.45rem;
  color: var(--muted-strong);
  font-size: 0.86rem;
  font-weight: 700;
}

input[type="text"],
input[type="number"] {
  width: 100%;
  min-width: 0;
  padding: 0.8rem 0.9rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.045);
  color: var(--ink);
  outline: none;
  transition: border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

input[type="text"]:focus,
input[type="number"]:focus {
  border-color: rgba(108, 245, 202, 0.35);
  box-shadow: 0 0 0 3px rgba(108, 245, 202, 0.09);
  background: rgba(255, 255, 255, 0.06);
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.mode-grid,
.summary-grid,
.score-box,
.button-stack.dual {
  display: grid;
  gap: 10px;
}

.mode-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.summary-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 10px;
}

.summary-card.wide {
  grid-column: 1 / -1;
}

.score-box {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 10px;
}

.level-option,
.mode-option {
  position: relative;
  display: grid;
  gap: 0.35rem;
  min-height: 0;
  padding: 0.75rem 0.82rem;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.level-option:hover,
.mode-option:hover,
button:hover {
  transform: translateY(-1px);
}

.level-option input,
.mode-option input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.level-option:has(input:checked),
.mode-option:has(input:checked) {
  border-color: rgba(108, 245, 202, 0.3);
  background:
    linear-gradient(180deg, rgba(12, 28, 23, 0.95), rgba(7, 12, 10, 0.98)),
    var(--accent-soft);
}

.level-token,
.mode-title {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.level-caption,
.mode-copy,
.progress-text,
.word-query {
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.4;
}

.inline-field {
  display: grid;
  grid-template-columns: 1fr 118px;
  gap: 12px;
  align-items: end;
}

.inline-field .field-label {
  margin-bottom: 0;
}

.button-stack.dual {
  grid-template-columns: 1fr 1fr;
}

button {
  border: 0;
  border-radius: 16px;
  padding: 0.82rem 0.92rem;
  font-size: 0.92rem;
  font-weight: 800;
  cursor: pointer;
  transition: transform 140ms ease, opacity 140ms ease, background 140ms ease;
}

button:disabled {
  opacity: 0.42;
  cursor: not-allowed;
  transform: none;
}

.accent-button {
  color: #04110c;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
}

.secondary-button,
.ghost-button {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--line);
}

.wide-button {
  width: 100%;
  margin-top: 0.65rem;
}

.status-box,
.inline-feedback,
.feedback {
  margin: 0;
  padding: 0.78rem 0.9rem;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
  color: var(--muted-strong);
  line-height: 1.45;
}

.status-box.good,
.inline-feedback.good,
.feedback.good {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: rgba(108, 245, 202, 0.18);
}

.status-box.bad,
.inline-feedback.bad,
.feedback.bad {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: rgba(255, 139, 125, 0.18);
}

.status-box.info,
.inline-feedback.info,
.feedback.info {
  color: var(--violet);
  background: var(--violet-soft);
  border-color: rgba(139, 157, 255, 0.18);
}

.progress-wrap {
  margin-top: 0.55rem;
}

.progress-bar {
  width: 100%;
  height: 12px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.06);
}

#progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--violet));
  transition: width 180ms ease;
}

.flashcard-panel {
  position: relative;
  min-height: 0;
  padding: clamp(12px, 1vw, 18px);
  overflow: auto;
  background:
    radial-gradient(circle at top right, rgba(108, 245, 202, 0.05), transparent 24%),
    radial-gradient(circle at bottom left, rgba(139, 157, 255, 0.08), transparent 26%),
    linear-gradient(180deg, rgba(13, 13, 16, 0.99), rgba(5, 5, 7, 0.99));
}

.session-launcher,
.session-content {
  width: 100%;
}

.session-launcher {
  display: grid;
  place-items: center;
  min-height: 100%;
}

.launcher-inner {
  width: min(100%, 640px);
  display: grid;
  gap: 12px;
  padding: clamp(14px, 1.4vw, 20px);
  border-radius: 30px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(145deg, rgba(15, 28, 23, 0.88), rgba(10, 12, 15, 0.98)),
    linear-gradient(145deg, rgba(108, 245, 202, 0.05), rgba(139, 157, 255, 0.08));
  box-shadow: var(--shadow);
}

.launcher-kicker {
  margin: 0;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  font-weight: 800;
}

.launcher-inner h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.launcher-copy {
  margin: 0;
  color: var(--muted-strong);
  font-size: 0.92rem;
  line-height: 1.45;
}

.launcher-mode-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.launcher-question-field {
  display: grid;
  grid-template-columns: 1fr 140px;
  gap: 10px;
  align-items: end;
}

.launcher-question-field .field-label {
  margin-bottom: 0;
}

.launcher-actions {
  display: grid;
  justify-content: center;
}

.large-start-button {
  min-height: 48px;
  font-size: 0.96rem;
  min-width: 280px;
}

.session-content {
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 100%;
}

.flashcard-head,
.card-meta,
.chip-row,
.session-quickbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-wrap: wrap;
}

.chip-row {
  justify-content: flex-start;
}

.session-quickbar {
  justify-content: flex-start;
}

.soft-chip,
.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 34px;
  padding: 0 0.85rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.05);
  color: var(--muted-strong);
  font-size: 0.78rem;
  font-weight: 700;
}

.soft-chip {
  color: var(--accent);
  border-color: rgba(108, 245, 202, 0.18);
  background: rgba(108, 245, 202, 0.08);
}

.soft-chip.muted {
  color: var(--muted);
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.status-pill.live {
  color: var(--accent);
  border-color: rgba(108, 245, 202, 0.24);
  background: rgba(108, 245, 202, 0.1);
}

.status-pill.done {
  color: var(--violet);
  border-color: rgba(139, 157, 255, 0.24);
  background: rgba(139, 157, 255, 0.12);
}

.card-meta {
  color: var(--muted);
  font-size: 0.84rem;
}

.quick-stat {
  display: grid;
  gap: 4px;
  min-width: 96px;
  padding: 0.8rem 0.95rem;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
}

.quick-stat span {
  color: var(--muted);
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.quick-stat strong {
  font-size: 1.15rem;
  letter-spacing: -0.03em;
}

.word-card {
  display: grid;
  align-content: start;
  gap: 0.75rem;
  padding: clamp(1rem, 1.5vw, 1.4rem);
  border-radius: 28px;
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(145deg, rgba(15, 28, 23, 0.92), rgba(10, 12, 15, 0.98)),
    linear-gradient(145deg, rgba(108, 245, 202, 0.05), rgba(139, 157, 255, 0.08));
}

.word-label {
  display: inline-flex;
  width: fit-content;
  min-height: 30px;
  align-items: center;
  padding: 0 0.75rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--accent);
}

.word-text {
  font-family: "Iowan Old Style", "Palatino Linotype", serif;
  font-size: clamp(1.8rem, 4.1vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.05em;
}

.options {
  display: grid;
  gap: 10px;
  align-content: start;
}

.option-button {
  width: 100%;
  text-align: left;
  padding: 1rem 1.1rem;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 18, 22, 0.98), rgba(10, 10, 12, 0.98));
  color: var(--ink);
  font-size: 1rem;
}

.option-button.correct {
  color: var(--accent);
  border-color: rgba(108, 245, 202, 0.26);
  background: linear-gradient(180deg, rgba(11, 31, 25, 0.96), rgba(7, 14, 12, 0.99));
}

.option-button.wrong {
  color: var(--danger);
  border-color: rgba(255, 139, 125, 0.24);
  background: linear-gradient(180deg, rgba(34, 15, 13, 0.96), rgba(14, 7, 6, 0.99));
}

.feedback {
  min-height: 3.55rem;
  font-size: 0.9rem;
  font-weight: 700;
}

.hidden {
  display: none !important;
}

body[data-session-active="true"] .top-strip,
body[data-session-active="true"] .control-panel,
body[data-session-active="true"] .chip-row,
body[data-session-active="true"] .card-meta,
body[data-session-active="true"] .word-query {
  display: none !important;
}

body[data-session-active="true"] .workspace {
  grid-template-columns: 1fr;
  grid-template-rows: minmax(0, 1fr);
}

body[data-session-active="true"] .flashcard-panel {
  padding: clamp(12px, 1vw, 18px);
}

body[data-session-active="true"] .flashcard-head {
  justify-content: flex-end;
}

body[data-session-active="true"] .flashcard-head > .accent-button {
  min-width: 140px;
}

@media (max-width: 1100px), (max-height: 780px) {
  .topbar-row {
    align-items: flex-start;
  }

  .library-nav {
    justify-content: stretch;
  }

  .library-link {
    flex: 1 1 0;
  }

  .top-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workspace {
    grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  }

  .control-panel {
    gap: 10px;
  }

  .panel-section h2 {
    font-size: 1.05rem;
  }
}

@media (max-width: 820px), (max-aspect-ratio: 4/5) {
  html,
  body {
    overflow: hidden;
  }

  .topbar-row {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .brand-mark {
    font-size: 1.35rem;
  }

  .top-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: minmax(248px, 34dvh) minmax(0, 1fr);
  }

  .control-panel {
    grid-template-rows: auto minmax(0, 1fr);
    gap: 10px;
  }

  .mobile-panel-switcher {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    padding: 8px;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(16, 16, 20, 0.98), rgba(9, 9, 12, 0.98));
  }

  .mobile-tab-button {
    min-height: 42px;
    padding: 0.72rem 0.9rem;
    border-radius: 14px;
    border: 1px solid transparent;
    background: rgba(255, 255, 255, 0.04);
    color: var(--muted-strong);
    font-size: 0.84rem;
    font-weight: 800;
  }

  .mobile-tab-button.active {
    color: #04110c;
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  }

  body[data-mobile-panel="setup"] .status-section,
  body[data-mobile-panel="status"] .setup-section {
    display: none;
  }

  body[data-mobile-panel="setup"] .setup-section,
  body[data-mobile-panel="status"] .status-section {
    display: grid;
  }

  .panel {
    border-radius: 24px;
  }

  .panel-section,
  .flashcard-panel {
    border-radius: 22px;
  }

  .panel-section {
    padding: 12px;
  }

  .session-form {
    gap: 9px;
  }

  .level-grid,
  .mode-grid,
  .launcher-mode-grid {
    gap: 8px;
  }

  .launcher-inner {
    width: 100%;
    padding: 16px;
    border-radius: 22px;
    gap: 12px;
    max-height: 100%;
    overflow: auto;
    scrollbar-width: none;
  }

  .launcher-inner::-webkit-scrollbar {
    display: none;
  }

  .launcher-mode-grid,
  .launcher-actions {
    grid-template-columns: 1fr;
  }

  .launcher-question-field {
    grid-template-columns: 1fr 96px;
  }

  .large-start-button {
    min-width: 0;
    width: 100%;
  }

  .word-card {
    border-radius: 22px;
    padding: 1rem;
  }

  .options {
    align-content: start;
    overflow: auto;
    scrollbar-width: none;
  }

  body[data-session-active="true"] .options {
    overflow: visible;
  }

  .options::-webkit-scrollbar {
    display: none;
  }

  .option-button {
    padding: 0.88rem 0.92rem;
    font-size: 0.95rem;
  }

  .soft-chip,
  .status-pill {
    min-height: 30px;
    padding: 0 0.65rem;
    font-size: 0.72rem;
  }

  body[data-session-active="true"] .flashcard-head > .accent-button {
    width: auto;
  }
}

@media (max-width: 560px) {
  .viewport {
    padding:
      max(6px, env(safe-area-inset-top))
      max(6px, env(safe-area-inset-right))
      max(6px, env(safe-area-inset-bottom))
      max(6px, env(safe-area-inset-left));
  }

  .app-frame {
    padding: 6px;
    gap: 8px;
  }

  .library-nav {
    gap: 6px;
  }

  .brand-mark {
    min-height: 28px;
    font-size: 1.18rem;
  }

  .library-link {
    min-height: 32px;
    padding: 0 10px;
    font-size: 0.72rem;
  }

  .mini-metric {
    min-height: 62px;
    padding: 10px 12px;
  }

  .metric-label,
  .section-kicker,
  .summary-card span,
  .score-box span,
  .word-label {
    font-size: 0.64rem;
  }

  .workspace {
    grid-template-rows: minmax(232px, 31dvh) minmax(0, 1fr);
    gap: 8px;
  }

  .level-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .mode-grid,
  .summary-grid,
  .score-box {
    grid-template-columns: 1fr;
  }

  .summary-card.wide {
    grid-column: auto;
  }

  .word-text {
    font-size: clamp(1.72rem, 8vw, 2.2rem);
  }

  .card-meta {
    font-size: 0.78rem;
  }

  .session-quickbar {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
  }

  .quick-stat {
    min-width: 0;
    padding: 0.72rem 0.8rem;
    border-radius: 16px;
  }

  .flashcard-head {
    align-items: stretch;
  }

  .flashcard-head > .accent-button {
    width: 100%;
  }
}

@media (max-width: 390px), (max-height: 720px) {
  .top-strip {
    gap: 6px;
  }

  .mini-metric {
    min-height: 56px;
    padding: 9px 10px;
  }

  .mini-metric small {
    font-size: 0.72rem;
  }

  .workspace {
    grid-template-rows: minmax(214px, 29dvh) minmax(0, 1fr);
  }

  .panel-section {
    padding: 10px;
  }

  .launcher-inner {
    padding: 12px;
  }

  .launcher-copy {
    font-size: 0.9rem;
    line-height: 1.45;
  }

  .soft-chip,
  .status-pill {
    min-height: 28px;
    font-size: 0.68rem;
  }

  .quick-stat strong {
    font-size: 1rem;
  }
}