/* ============================================
   章节列表页(chapter-card / batch-hint)
   ============================================ */

.chapter-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 14px;
    margin: 20px 0 30px;
    max-height: 62vh;
    overflow-y: auto;
    padding: 4px;
}

/* 滚动条美化(章节列表 + 关卡列表共用) */
.chapter-list::-webkit-scrollbar,
.level-list::-webkit-scrollbar { width: 8px; }
.chapter-list::-webkit-scrollbar-track,
.level-list::-webkit-scrollbar-track { background: rgba(0,0,0,.15); border-radius: 6px; }
.chapter-list::-webkit-scrollbar-thumb,
.level-list::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #d97706, #a15c1a);
    border-radius: 6px;
}

.chapter-card {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 0;
    color: #fff;
    background: linear-gradient(135deg, #2a3a70 0%, #3d2c6b 100%);
    border: 2px solid rgba(180, 120, 60, .35);
    border-radius: 14px;
    cursor: pointer;
    font-weight: bold;
    letter-spacing: 1px;
    transition: transform .2s, box-shadow .25s, border-color .25s;
    box-shadow: 0 4px 15px rgba(180, 100, 30, .25), inset 0 1px 0 rgba(255, 255, 255, .15);
    overflow: hidden;
    height: 180px;
}

/* 章节封面图区(用 flex 撑满卡片剩余空间) */
.chapter-cover {
    position: relative;
    width: 100%;
    flex: 1 1 auto;
    min-height: 0;
    background: linear-gradient(135deg, #1c2340 0%, #241b40 100%);
    overflow: hidden;
}
.chapter-cover .cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    display: block;
    opacity: 0;
    transition: opacity .35s ease, filter .5s ease;
}
.chapter-cover .cover-img.loaded { opacity: 1; }

/* 章节信息区(极致压缩,让图片吃满剩余空间) */
.chapter-info {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3px 4px 4px;
    gap: 0;
    line-height: 1.15;
}

/* 光泽扫过特效 */
.chapter-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: -60%;
    width: 40%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,.2), transparent);
    transform: skewX(-20deg);
    transition: left .6s ease;
    pointer-events: none;
}
.chapter-card:not(.locked):hover {
    transform: translateY(-3px) scale(1.02);
    border-color: rgba(180, 200, 255, .8);
    box-shadow: 0 8px 25px rgba(80, 130, 255, .45), inset 0 1px 0 rgba(255,255,255,.15);
}
.chapter-card:not(.locked):hover::before { left: 120%; }

.chapter-num {
    font-size: .95em;
    font-weight: 900;
    letter-spacing: 1.2px;
    text-shadow: 0 2px 4px rgba(0,0,0,.4);
    line-height: 1.1;
}
.chapter-range {
    font-size: .62em;
    color: rgba(255, 255, 255, .65);
    letter-spacing: 1px;
    margin-top: 0;
    line-height: 1.1;
}
.chapter-progress {
    margin-top: 2px;
    font-size: .66em;
    padding: 1px 8px;
    background: rgba(0, 0, 0, .25);
    border: 1px solid rgba(255, 255, 255, .12);
    border-radius: 10px;
    letter-spacing: 1px;
    line-height: 1.3;
}

/* 封面模糊/清晰状态 —— 章节 & 关卡通用 */
.chapter-card.cover-blur .cover-img,
.level-cell.cover-blur .cover-img {
    filter: blur(3px) brightness(.9);
    transform: scale(1.04); /* 消除 blur 边缘透明 */
}
.chapter-card.cover-clear .cover-img,
.level-cell.cover-clear .cover-img {
    filter: none;
    transform: none;
}

/* 未解锁章节 */
.chapter-card.locked {
    background: linear-gradient(135deg, #1a1e2e 0%, #24232b 100%);
    border-color: rgba(100, 100, 110, .3);
    cursor: not-allowed;
    filter: grayscale(.7);
    opacity: .6;
}
.chapter-lock {
    position: absolute;
    top: 8px;
    right: 10px;
    font-size: 1.2em;
    opacity: .8;
}

/* ---------- 分批解锁章节的底部提示 ---------- */
.batch-hint {
    margin: 4px 4px 20px;
    padding: 12px 16px;
    text-align: center;
    color: #ffd7a3;
    font-size: .9em;
    letter-spacing: 1px;
    background: linear-gradient(135deg, rgba(60, 45, 90, .55) 0%, rgba(45, 60, 100, .55) 100%);
    border: 1px dashed rgba(255, 200, 120, .45);
    border-radius: 12px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06);
}
.batch-hint b {
    color: #ffe6b8;
    font-weight: 900;
    padding: 0 3px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
    .chapter-list { grid-template-columns: repeat(auto-fill, minmax(130px, 1fr)); gap: 10px; }
    .chapter-card { padding: 0; height: 160px; }
    .chapter-info { padding: 3px 4px 4px; }
    .chapter-num { font-size: .88em; letter-spacing: 1px; }
    .chapter-range { font-size: .58em; }
    .chapter-progress { font-size: .6em; padding: 1px 6px; }
}