/* ============================================================
 * 7. 文章封面轮播
 * ============================================================ */
.single-cover-slider {
    position: relative;
    width: 100%;
    overflow: hidden;
    border-radius: var(--radius-lg, 8px);
}

.single-cover-slider .swiper-slide {
    position: relative;
    overflow: hidden;
}

.single-cover-slider__img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    display: block;
}

.single-cover-slider__overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,0.6) 100%);
    pointer-events: none;
}

.single-cover-slider__content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 24px;
    color: #fff;
    z-index: 2;
}

.single-cover-slider__title {
    margin: 0 0 8px;
    font-size: 24px;
    font-weight: 700;
    text-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.single-cover-slider__meta {
    display: flex;
    gap: 16px;
    font-size: 13px;
    opacity: 0.9;
}

.single-cover-slider__pagination {
    position: absolute;
    bottom: 12px;
    right: 16px;
    z-index: 3;
}

.single-cover-slider__pagination .swiper-pagination-bullet {
    background: rgba(255,255,255,0.6);
    opacity: 1;
}

.single-cover-slider__pagination .swiper-pagination-bullet-active {
    background: #fff;
}

.single-cover-slider__prev,
.single-cover-slider__next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 3;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(0,0,0,0.3);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.single-cover-slider__prev:hover,
.single-cover-slider__next:hover {
    background: rgba(0,0,0,0.5);
}

.single-cover-slider__prev { left: 12px; }
.single-cover-slider__next { right: 12px; }

@media (max-width: 640px) {
    .single-cover-slider__img {
        height: 240px;
    }
    .single-cover-slider__title {
        font-size: 18px;
    }
}

/* ============================================================
 * 8. 打赏按钮
 * ============================================================ */
.action-btn--reward {
    position: relative;
}

.action-btn--reward.is-active {
    color: var(--color-warning, #F59E0B);
}

.reward-modal {
    position: fixed;
    inset: 0;
    z-index: 99999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
}

.reward-modal.is-open {
    opacity: 1;
    visibility: visible;
}

.reward-modal__overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
}

.reward-modal__card {
    position: relative;
    background: var(--surface-1, #fff);
    border-radius: var(--radius-lg, 8px);
    padding: 32px;
    max-width: 360px;
    width: 90%;
    text-align: center;
    box-shadow: 0 8px 32px rgba(0,0,0,0.15);
    z-index: 1;
}

.reward-modal__title {
    margin: 0 0 8px;
    font-size: 18px;
    font-weight: 600;
    color: var(--color-ink);
}

.reward-modal__desc {
    margin: 0 0 20px;
    font-size: 14px;
    color: var(--color-ink-3);
}

.reward-modal__qr {
    width: 200px;
    height: 200px;
    margin: 0 auto 16px;
    border-radius: var(--radius, 10px);
    overflow: hidden;
}

.reward-modal__qr img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.reward-modal__close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    border-radius: 50%;
    background: var(--surface-2, #F4F5F7);
    color: var(--color-ink-3);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.reward-modal__close:hover {
    background: var(--surface-3, #ECEEF1);
}



.reward-modal__content > p {
  margin: -4px 0 18px;
}

.reward-amounts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 18px 0;
}

.reward-amount {
  min-height: 42px;
  border: 1px solid var(--color-line-soft, rgba(15, 23, 42, 0.1));
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--color-ink-2);
  cursor: pointer;
  font-weight: 700;
}

.reward-amount.is-active {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.reward-custom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  color: var(--color-ink-3);
  font-size: 13px;
}

.reward-custom input {
  width: 140px;
  min-height: 40px;
  border: 1px solid var(--color-line-soft, rgba(15, 23, 42, 0.1));
  border-radius: 9px;
  background: var(--surface-1);
  color: var(--color-ink);
  padding: 0 12px;
}

.reward-modal__submit {
  width: 100%;
  min-height: 42px;
}

.reward-modal__message {
  min-height: 20px;
  margin-top: 10px;
  color: var(--color-primary);
  font-size: 12px;
  text-align: center;
}