:root {
  --ink: #102033;
  --blue-dark: #17456f;
  --blue: #2f7fb8;
  --blue-soft: #d9edf9;
  --blue-pale: #eef8fd;
  --line: #a8c8dc;
  --muted: #526879;
  --correct: #2f7d59;
  --correct-soft: #e4f4ec;
  --wrong: #ba4d5d;
  --wrong-soft: #fdecef;
  --gold: #a8761a;
  --shadow: 0 16px 40px rgba(23, 69, 111, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  overflow-x: hidden;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #f4fbff 0%, #ffffff 48%, #edf7fc 100%);
  color: var(--ink);
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow-wrap: anywhere;
}

img,
svg {
  max-width: 100%;
}

button,
select,
textarea {
  font: inherit;
}

button,
a,
select,
textarea {
  -webkit-tap-highlight-color: transparent;
}

a:focus-visible,
button:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 3px solid rgba(47, 127, 184, 0.48);
  outline-offset: 3px;
}

h1,
h2,
h3,
p,
li,
a,
button,
span,
strong {
  overflow-wrap: anywhere;
  word-break: break-word;
}

.practice-shell {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 16px;
  min-width: 0;
}

.practice-topbar,
.practice-layout,
.practice-hero {
  margin-bottom: 18px;
}

.practice-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand-link {
  flex: 1 1 auto;
  min-width: 0;
}

.brand-link img {
  display: block;
  width: min(100%, 760px);
  height: auto;
}

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

.tool-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--blue-dark);
  padding: 8px 14px;
  font-weight: 850;
  text-decoration: none;
}

.tool-nav a[aria-current="page"] {
  background: var(--blue-dark);
  color: #fff;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.panel,
.practice-topbar,
.practice-hero,
.quiz-panel,
.practice-side,
.practice-layout,
.practice-prompt,
.prompt-help,
.prompt-task,
.sentence,
.answer-option,
.ai-prompt-box,
.bank-note,
.quiz-complete,
.practice-review,
.review-item,
.privacy-note {
  min-width: 0;
  overflow-wrap: break-word;
}

.practice-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 0.42fr);
  gap: 22px;
  align-items: end;
  padding: clamp(22px, 4vw, 38px);
}

.label {
  margin: 0 0 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

.practice-hero h1 {
  margin: 0;
  max-width: 760px;
  color: var(--ink);
  font-size: clamp(1.8rem, 3.4vw, 3rem);
  line-height: 1.05;
}

.practice-hero p:not(.label) {
  max-width: 820px;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.5;
}

.setup-box {
  display: grid;
  gap: 12px;
  border: 1px solid rgba(47, 127, 184, 0.26);
  border-radius: 8px;
  background: var(--blue-pale);
  padding: 16px;
}

.setup-box label {
  display: grid;
  gap: 8px;
  color: var(--blue-dark);
  font-weight: 850;
}

.setup-box select {
  min-height: 46px;
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 0 12px;
  font-weight: 800;
}

.primary-action,
.ghost-action {
  min-height: 46px;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0 18px;
  font-weight: 850;
  cursor: pointer;
  text-align: center;
}

.primary-action {
  background: var(--blue);
  color: #fff;
}

.primary-action:disabled {
  cursor: default;
  opacity: 0.58;
}

.ghost-action {
  border-color: var(--line);
  background: #fff;
  color: var(--ink);
}

.practice-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.52fr) minmax(300px, 0.78fr);
  gap: 18px;
  align-items: start;
}

.quiz-panel,
.practice-side {
  padding: clamp(16px, 3vw, 26px);
}

.practice-side {
  position: sticky;
  top: 24px;
}

.practice-progress {
  display: grid;
  grid-template-columns: auto minmax(160px, 1fr);
  gap: 18px;
  align-items: center;
}

.progress-count {
  margin: 0;
  font-size: 1.24rem;
  font-weight: 850;
}

.meter {
  height: 12px;
  border-radius: 999px;
  background: #d5e8f3;
  overflow: hidden;
}

.meter span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--blue-dark), var(--blue));
  transition: width 160ms ease;
}

.practice-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 12px;
}

.tag,
.chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue-dark);
  padding: 6px 10px;
  font-size: 0.82rem;
  font-weight: 850;
}

.practice-prompt {
  display: grid;
  gap: 12px;
  margin-bottom: 16px;
}

.prompt-help,
.prompt-task {
  border-radius: 8px;
}

.prompt-help {
  border: 1px solid rgba(47, 127, 184, 0.28);
  border-left: 5px solid var(--blue);
  background: var(--blue-pale);
  padding: 10px 12px;
  color: var(--blue-dark);
  font-weight: 800;
  line-height: 1.4;
}

.prompt-task {
  border: 2px solid rgba(47, 127, 184, 0.3);
  border-left: 8px solid var(--blue);
  background: #fff;
  padding: 14px;
}

.part-label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.instruction {
  display: block;
  color: var(--blue-dark);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  font-weight: 900;
  line-height: 1.3;
}

.sentence {
  display: block;
  margin-top: 10px;
  border: 1px solid rgba(47, 127, 184, 0.22);
  border-radius: 8px;
  background: #f9fdff;
  padding: 12px 14px;
  color: var(--ink);
  font-size: clamp(1.35rem, 3vw, 2.2rem);
  font-weight: 900;
  line-height: 1.16;
}

.practice-answers {
  display: grid;
  gap: 8px;
}

.answer-option {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 10px;
  align-items: center;
  min-height: 50px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 10px 14px;
  cursor: pointer;
}

.answer-option input {
  width: 18px;
  height: 18px;
  accent-color: var(--blue);
}

.answer-option.correct {
  border-color: var(--correct);
  background: var(--correct-soft);
}

.answer-option.incorrect {
  border-color: var(--wrong);
  background: var(--wrong-soft);
}

.practice-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.practice-review {
  margin-top: 18px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.practice-review[hidden] {
  display: none;
}

.practice-review h2 {
  margin: 0;
  color: var(--blue-dark);
  font-size: 1.18rem;
}

.practice-review > p {
  margin: 6px 0 12px;
  color: var(--muted);
  font-weight: 750;
  line-height: 1.4;
}

.review-list {
  display: grid;
  gap: 10px;
}

.review-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 12px;
}

.review-item.is-correct {
  border-color: rgba(47, 125, 89, 0.4);
  background: var(--correct-soft);
}

.review-item.is-missed {
  border-color: rgba(186, 77, 93, 0.42);
  background: var(--wrong-soft);
}

.review-item h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.review-meta,
.review-rationale,
.review-target {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 750;
  line-height: 1.42;
}

.review-target {
  color: var(--ink);
}

.side-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 12px;
}

.side-stats div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--blue-pale);
  padding: 12px;
}

.side-stats span {
  display: block;
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 850;
  text-transform: uppercase;
}

.side-stats strong {
  display: block;
  margin-top: 6px;
  color: var(--blue-dark);
  font-size: 1.35rem;
}

.side-note {
  margin-top: 12px;
  border-radius: 8px;
  background: #f7fcff;
  color: var(--muted);
  padding: 12px;
  font-weight: 750;
  line-height: 1.42;
}

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

.practice-summary h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.practice-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.ai-prompt-box {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7fcff;
  padding: 12px;
}

.ai-prompt-box summary {
  color: var(--blue-dark);
  font-weight: 900;
  cursor: pointer;
}

.ai-prompt-box p {
  margin: 10px 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 750;
  line-height: 1.4;
}

.ai-prompt-box textarea {
  width: 100%;
  min-height: 190px;
  max-height: 340px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  font-size: 0.82rem;
  font-weight: 650;
  line-height: 1.45;
  resize: vertical;
}

.copy-prompt-action {
  width: 100%;
  margin-top: 10px;
}

.copy-prompt-action.is-copied {
  border-color: #102033;
  background: #102033;
  color: #fff;
}

.copy-prompt-status {
  display: block;
  min-height: 20px;
  margin-top: 8px;
  color: var(--blue-dark);
  font-size: 0.84rem;
  font-weight: 850;
}

.bank-note {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-top: 16px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  padding: 16px;
}

.bank-note strong {
  flex: 0 0 auto;
  font-size: 1.8rem;
  overflow-wrap: normal;
  white-space: nowrap;
  word-break: normal;
}

.bank-note span {
  color: rgba(255, 255, 255, 0.78);
  line-height: 1.35;
}

.privacy-note {
  margin-top: 16px;
  border: 1px solid rgba(168, 200, 220, 0.72);
  border-radius: 8px;
  background: #f7fcff;
  padding: 14px 16px;
}

.privacy-note h2 {
  margin: 0;
  color: var(--blue-dark);
  font-size: 1rem;
}

.privacy-note p {
  margin: 8px 0 0;
  color: var(--muted);
  font-weight: 750;
  line-height: 1.42;
}

.quiz-complete {
  border: 1px solid rgba(47, 127, 184, 0.28);
  border-radius: 8px;
  background: var(--blue-pale);
  padding: 18px;
}

.quiz-complete h2 {
  margin: 0;
  color: var(--blue-dark);
}

@media (max-width: 880px) {
  .practice-topbar,
  .practice-hero,
  .practice-layout {
    grid-template-columns: 1fr;
  }

  .practice-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .tool-nav {
    justify-content: flex-start;
  }

  .practice-side {
    position: static;
  }
}

@media (max-width: 560px) {
  .practice-shell {
    padding: 12px 10px;
  }

  .practice-hero,
  .quiz-panel,
  .practice-side {
    padding: 16px;
  }

  .practice-hero h1 {
    font-size: 1.55rem;
  }

  .practice-hero p:not(.label) {
    font-size: 0.92rem;
  }

  .practice-progress,
  .side-stats {
    grid-template-columns: 1fr;
  }

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

  .sentence {
    font-size: 1.08rem;
  }

  .prompt-help,
  .instruction {
    font-size: 0.92rem;
  }

  .practice-actions .primary-action,
  .practice-actions .ghost-action {
    flex: 1 1 100%;
  }
}