/* 7-day learning challenge: home card, tasks-page detail and the completion reward modal.
   Shared by /learn/ (card) and /learn/tasks/ (detail). Visual language follows
   learner-theme: light surface, orange primary, 8px radius. */

.learn-challenge-card,
.learn-challenge-panel {
  display: grid;
  gap: 14px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.learn-challenge-card[hidden],
.learn-challenge-panel[hidden] {
  display: none;
}

.learn-challenge-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.learn-challenge-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--primary);
}

.learn-challenge-heading h2 {
  margin: 6px 0 0;
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  line-height: 1.35;
  color: var(--ink);
}

.learn-challenge-heading p {
  margin: 6px 0 0;
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--muted);
}

.learn-challenge-head-action {
  flex: 0 0 auto;
}

/* Compact day strip on the home card: ● ● ● ○ ○ ○ ○ */
.learn-challenge-days {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-challenge-days li {
  display: grid;
  justify-items: center;
  gap: 5px;
  padding: 8px 2px;
  border-radius: var(--radius-sm);
  background: var(--surface-alt, #fbfcfe);
}

.learn-challenge-days li .learn-challenge-dot {
  display: grid;
  width: 26px;
  height: 26px;
  place-items: center;
  border: 1.5px solid var(--line-strong, #bad5df);
  border-radius: 50%;
  background: #fff;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--muted);
  line-height: 1;
}

.learn-challenge-days li .learn-challenge-day-label {
  font-size: 0.68rem;
  color: var(--muted);
  white-space: nowrap;
}

.learn-challenge-days li.is-completed {
  background: var(--primary-soft);
}

.learn-challenge-days li.is-completed .learn-challenge-dot {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.learn-challenge-days li.is-current .learn-challenge-dot {
  border-color: var(--primary);
  border-style: dashed;
  color: var(--primary);
}

.learn-challenge-days li.is-current .learn-challenge-day-label {
  color: var(--primary);
  font-weight: 600;
}

.learn-challenge-foot {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--muted);
}

.learn-challenge-foot strong {
  font-size: 1.05rem;
  color: var(--ink);
}

.learn-challenge-today {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #1c7a3e;
  font-weight: 600;
}

.learn-challenge-today[hidden] {
  display: none;
}

.learn-challenge-feedback {
  margin: 0;
  padding: 10px 12px;
  border: 1px solid var(--primary);
  border-radius: var(--radius-sm);
  background: var(--primary-soft);
  font-size: 0.86rem;
  line-height: 1.5;
  color: var(--ink);
}

.learn-challenge-feedback[hidden] {
  display: none;
}

[data-challenge-ended] {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.learn-challenge-ended-close {
  flex: 0 0 32px;
  width: 32px;
  height: 32px;
  padding: 0;
  border: 0;
  border-radius: 4px;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.learn-challenge-ended-close:hover {
  background: var(--primary-soft);
}

.learn-challenge-ended-close:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Tasks page: seven steps in one horizontal progress row. */
.learn-challenge-day-list {
  display: grid;
  grid-template-columns: repeat(7, minmax(60px, 1fr));
  overflow-x: auto;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.learn-challenge-day-list li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 10px 4px;
  justify-items: center;
  text-align: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.learn-challenge-day-list .learn-challenge-dot {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border: 1.5px solid var(--line-strong, #bad5df);
  border-radius: 50%;
  background: #fff;
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--muted);
  line-height: 1;
}

.learn-challenge-day-list li.is-completed {
  border-color: #f3c9ab;
  background: var(--primary-soft);
}

.learn-challenge-day-list li.is-completed .learn-challenge-dot {
  border-color: var(--primary);
  background: var(--primary);
  color: #fff;
}

.learn-challenge-day-list li.is-current {
  border-color: var(--primary);
}

.learn-challenge-day-list li.is-current .learn-challenge-dot {
  border-color: var(--primary);
  border-style: dashed;
  color: var(--primary);
}

.learn-challenge-day-main {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.learn-challenge-day-main strong {
  font-size: 0.9rem;
  color: var(--ink);
}

.learn-challenge-day-main small {
  font-size: 0.76rem;
  color: var(--muted);
}

.learn-challenge-day-state {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
}

.learn-challenge-day-list li.is-completed .learn-challenge-day-state {
  color: var(--primary);
}

.learn-challenge-day-list li.is-current .learn-challenge-day-state {
  color: var(--primary);
}

.learn-challenge-reward-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
}

.learn-challenge-reward {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border: 1px dashed var(--line-strong, #bad5df);
  border-radius: var(--radius-sm);
  background: var(--surface-alt, #fbfcfe);
}

.learn-challenge-reward.is-earned {
  border-style: solid;
  border-color: #f3c9ab;
  background: var(--primary-soft);
}

.learn-challenge-reward span {
  font-size: 0.76rem;
  color: var(--muted);
}

.learn-challenge-reward strong {
  font-size: 1rem;
  color: var(--ink);
}

.learn-challenge-reward small {
  font-size: 0.76rem;
  color: var(--muted);
}

.learn-challenge-badge {
  font-size: 1.5rem;
  line-height: 1;
}

/* Completion reward modal, shown once per challenge. */
.learn-challenge-modal {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(7, 19, 29, 0.55);
}

.learn-challenge-modal[hidden] {
  display: none;
}

.learn-challenge-modal-card {
  width: min(100%, 420px);
  display: grid;
  gap: 12px;
  padding: 26px 24px;
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow);
  text-align: center;
}

.learn-challenge-modal-card .learn-challenge-badge {
  font-size: 2.4rem;
}

.learn-challenge-modal-card h2 {
  margin: 0;
  font-size: 1.25rem;
  color: var(--ink);
}

.learn-challenge-modal-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.learn-challenge-modal-card .learn-challenge-modal-extra {
  color: var(--primary);
  font-weight: 600;
}

.learn-challenge-modal-card button {
  justify-self: center;
}

@media (max-width: 620px) {
  .learn-challenge-card,
  .learn-challenge-panel {
    padding: 15px 15px 16px;
  }

  .learn-challenge-days li {
    padding: 6px 1px;
  }

  .learn-challenge-days li .learn-challenge-dot {
    width: 22px;
    height: 22px;
    font-size: 0.66rem;
  }

  .learn-challenge-days li .learn-challenge-day-label {
    font-size: 0.6rem;
  }

  .learn-challenge-head-action {
    width: 100%;
  }

  .learn-challenge-head-action .button {
    width: 100%;
  }
}

/* 学习任务/首页：学习者没有挑战时，避免 focus-grid 在 821-1040px 区间空出一列。 */
.learn-home-focus-grid:has(> .learn-challenge-card[hidden]) {
  grid-template-columns: minmax(0, 1fr);
}