/* 学習モード（インプット教材）のスタイル。
   カラーは style.css の CSS変数をそのまま使うので、ライト／ダーク両対応になる。 */

.learn-hero {
  display: flex;
  align-items: center;
  gap: 14px;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 12px;
}

.learn-hero-main {
  flex: 1;
  min-width: 0;
}

.learn-hero .label {
  font-size: 0.72rem;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.learn-hero .big-num {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 2px 0 8px;
}

.learn-hero .start-btn {
  width: auto;
  margin: 0;
  flex: 0 0 auto;
  padding: 10px 16px;
  font-size: 0.85rem;
}

.learn-progress-track {
  height: 6px;
  background: var(--gridline);
  border-radius: 3px;
  overflow: hidden;
}

.learn-progress-fill {
  height: 100%;
  background: var(--seq-450);
  border-radius: 3px;
  transition: width 0.3s ease;
}

.learn-note {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0 0 18px;
}

.lesson-group {
  margin-bottom: 18px;
}

.lesson-group-head {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  padding: 0 2px 6px;
  border-bottom: 1px solid var(--gridline);
  margin-bottom: 6px;
}

.lesson-group-head .cat {
  display: inline-block;
  background: var(--seq-100);
  color: var(--seq-600);
  border-radius: 3px;
  padding: 1px 6px;
  margin-right: 8px;
  font-size: 0.68rem;
}

.lesson-row {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  text-align: left;
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 6px;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

.lesson-row:hover {
  border-color: var(--seq-450);
}

.lesson-row.done {
  border-left: 3px solid var(--good);
}

.lesson-row.reading {
  border-left: 3px solid var(--warning);
}

.lesson-main {
  flex: 1;
  min-width: 0;
}

.lesson-title {
  font-size: 0.92rem;
  font-weight: 600;
  line-height: 1.4;
}

.lesson-meta {
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 3px;
}

.lesson-score {
  margin-left: 10px;
}

.lesson-badge {
  flex: 0 0 auto;
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 999px;
  background: var(--gridline);
  color: var(--text-secondary);
  white-space: nowrap;
}

.lesson-badge.done {
  background: var(--good);
  color: #fff;
}

.lesson-badge.reading {
  background: var(--warning);
  color: #fff;
}

/* --- レッスン本文 --- */

.back-link {
  background: none;
  border: none;
  color: var(--seq-450);
  font-size: 0.82rem;
  font-family: inherit;
  padding: 0 0 12px;
  cursor: pointer;
}

.lesson-head {
  margin-bottom: 18px;
}

.lesson-head-meta {
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 4px;
}

.lesson-head h2 {
  font-size: 1.15rem;
  margin: 0 0 10px;
  line-height: 1.4;
}

.lesson-lead {
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-secondary);
  border-left: 3px solid var(--seq-450);
  padding-left: 12px;
}

.lesson-sec {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 12px;
}

.lesson-sec h3 {
  font-size: 0.92rem;
  margin: 0 0 10px;
  color: var(--seq-600);
}

.lesson-sec p,
.lesson-sec li {
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.lesson-sec p {
  margin: 0 0 10px;
}

.lesson-sec p:last-child {
  margin-bottom: 0;
}

.lesson-sec ul,
.lesson-sec ol {
  margin: 0 0 10px;
  padding-left: 22px;
}

.lesson-sec li {
  margin-bottom: 5px;
}

.lesson-sec li.new {
  background: rgba(237, 161, 0, 0.16);
  border-radius: 4px;
  padding: 3px 6px;
  margin-left: -6px;
}

.lesson-sec .callout {
  background: var(--seq-100);
  border-radius: 6px;
  padding: 10px 12px;
  margin: 10px 0;
  color: var(--text-primary);
}

table.cmp {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.78rem;
  margin: 10px 0;
  display: block;
  overflow-x: auto;
}

table.cmp th,
table.cmp td {
  border: 1px solid var(--gridline);
  padding: 7px 9px;
  text-align: left;
  line-height: 1.6;
  vertical-align: top;
}

table.cmp th {
  background: var(--gridline);
  font-weight: 600;
  white-space: nowrap;
}

table.cmp td.ok {
  color: var(--good-text);
  font-weight: 700;
  text-align: center;
}

table.cmp td.ng {
  color: var(--critical);
  font-weight: 700;
  text-align: center;
}

/* --- ひっかけ・覚え方 --- */

.lesson-sec.traps h3 {
  color: var(--critical);
}

.trap {
  border-left: 3px solid var(--critical);
  padding: 2px 0 2px 10px;
  margin-bottom: 10px;
}

.trap:last-child {
  margin-bottom: 0;
}

.trap-t {
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.6;
}

.trap-t::before {
  content: "\2715\00a0";
  color: var(--critical);
}

.trap-d {
  font-size: 0.79rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 2px;
}

.lesson-memo {
  background: var(--seq-100);
  border-radius: 10px;
  padding: 14px 16px;
  font-size: 0.85rem;
  line-height: 1.7;
  margin-bottom: 12px;
}

.lesson-memo span {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--seq-600);
  letter-spacing: 0.06em;
  margin-bottom: 4px;
}

/* --- 段階を進めるゲート --- */

.phase-gate {
  text-align: center;
  padding: 18px 16px;
  border: 1px dashed var(--border);
  border-radius: 10px;
  margin: 18px 0;
}

.gate-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.phase-gate .start-btn {
  margin: 0;
}

/* --- 確認テスト（マルバツ） --- */

.ox-item {
  border-bottom: 1px solid var(--gridline);
  padding: 12px 0;
}

.ox-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.ox-q {
  font-size: 0.85rem;
  line-height: 1.75;
}

.ox-num {
  display: inline-block;
  min-width: 20px;
  height: 20px;
  line-height: 20px;
  text-align: center;
  background: var(--gridline);
  color: var(--text-secondary);
  border-radius: 4px;
  font-size: 0.7rem;
  margin-right: 8px;
}

.ox-btns {
  display: flex;
  gap: 8px;
  margin-top: 10px;
}

.ox-btn {
  flex: 1;
  padding: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--surface-1);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
}

.ox-btn:hover:not(:disabled) {
  border-color: var(--seq-450);
}

.ox-btn:disabled {
  cursor: default;
  opacity: 0.5;
}

.ox-btn.is-answer {
  background: var(--good);
  color: #fff;
  border-color: var(--good);
  opacity: 1;
}

.ox-btn.is-wrong {
  background: var(--critical);
  color: #fff;
  border-color: var(--critical);
  opacity: 1;
}

.ox-verdict {
  font-size: 0.8rem;
  font-weight: 700;
  margin-top: 10px;
}

.ox-verdict.good {
  color: var(--good-text);
}

.ox-verdict.bad {
  color: var(--critical);
}

.ox-explain {
  font-size: 0.79rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-top: 4px;
}

.practice-sec .card {
  border: none;
  padding: 0;
  background: none;
  margin: 0;
}

/* --- 完了 --- */

.lesson-finish {
  text-align: center;
  background: var(--surface-1);
  border: 1px solid var(--good);
  border-radius: 10px;
  padding: 20px 16px;
  margin-top: 18px;
}

.finish-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--good-text);
}

.finish-score {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.finish-actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 14px;
}

.finish-actions button {
  padding: 12px;
  font-size: 0.85rem;
  font-family: inherit;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface-1);
  color: var(--text-primary);
  cursor: pointer;
}

.finish-actions .primary {
  background: var(--seq-450);
  color: #fff;
  border-color: var(--seq-450);
  font-weight: 600;
}

/* --- 問題の解説からレッスンへ戻るボタン --- */

.to-lesson-btn {
  display: block;
  width: 100%;
  margin-top: 10px;
  padding: 10px 12px;
  font-size: 0.8rem;
  font-family: inherit;
  text-align: left;
  background: var(--seq-100);
  color: var(--seq-600);
  border: 1px solid transparent;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  line-height: 1.5;
}

.to-lesson-btn:hover {
  border-color: var(--seq-450);
}

@media (max-width: 480px) {
  .learn-hero {
    flex-direction: column;
    align-items: stretch;
  }

  .learn-hero .start-btn {
    width: 100%;
  }
}