/* 元素周期表 /learn/periodic-table —— 交互网格 + 详情 + 顺口溜 + 清单表 */

.pt-page { max-width: 1040px; }

/* ============ 着色模式切换 ============ */
.pt-toolbar {
    display: flex; align-items: center; flex-wrap: wrap; gap: 12px;
    margin: 0 0 16px;
}
.pt-toolbar-label { font-size: 14px; color: var(--learn-ink-light); }
.pt-modes { display: inline-flex; border: 1px solid var(--learn-border); border-radius: 999px; overflow: hidden; background: #fff; }
.pt-mode {
    border: 0; background: transparent; cursor: pointer;
    padding: 7px 16px; font-size: 14px; color: var(--learn-ink-light);
    transition: background .15s ease, color .15s ease;
}
.pt-mode.active { background: var(--learn-accent); color: #fff; }
.pt-toolbar-hint { font-size: 13px; color: var(--learn-ink-light); margin-left: auto; }
.pt-toolbar-hint .bi { color: var(--learn-accent); }

/* ============ 周期表网格 ============ */
.pt-grid-wrap { overflow-x: auto; margin: 0 -20px 18px; padding: 0 20px 6px; -webkit-overflow-scrolling: touch; }
.pt-grid {
    display: grid;
    grid-template-columns: repeat(18, minmax(46px, 1fr));
    grid-auto-rows: 52px;
    gap: 3px;
    min-width: 880px;
}
.pt-cell {
    position: relative; border: 0; cursor: pointer; padding: 2px;
    border-radius: 5px; background: #eef1f4; color: #2a2a2a;
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    line-height: 1.05; overflow: hidden;
    transition: transform .1s ease, box-shadow .1s ease, opacity .15s ease;
}
.pt-cell:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,.16); z-index: 2; }
.pt-z { position: absolute; top: 2px; left: 4px; font-size: 9px; opacity: .7; }
.pt-sym { font-size: 17px; font-weight: 700; margin-top: 4px; }
.pt-name { font-size: 10px; opacity: .85; max-width: 100%; overflow: hidden; white-space: nowrap; }
.pt-cell.selected { outline: 3px solid var(--learn-ink); outline-offset: -1px; z-index: 3; }
.pt-cell.dim { opacity: .22; }
.pt-cell.flash { animation: pt-flash .9s ease; }
@keyframes pt-flash { 0%,100% { box-shadow: none; } 40% { box-shadow: 0 0 0 4px var(--learn-accent); } }

/* 镧锕系占位标签 */
.pt-placeholder { background: repeating-linear-gradient(45deg, #eef1f4, #eef1f4 5px, #e3e8ee 5px, #e3e8ee 10px); cursor: pointer; }
.pt-ph-range { font-size: 11px; font-weight: 700; }
.pt-ph-tip { font-size: 9px; opacity: .7; }

/* ---- 分类着色 ---- */
.pt-grid[data-color="category"] .pt-cell[data-cat="h"]          { background: #d7f0e0; }
.pt-grid[data-color="category"] .pt-cell[data-cat="alkali"]     { background: #ffd2bd; }
.pt-grid[data-color="category"] .pt-cell[data-cat="alkaline"]   { background: #ffe6ad; }
.pt-grid[data-color="category"] .pt-cell[data-cat="transition"] { background: #ffd3df; }
.pt-grid[data-color="category"] .pt-cell[data-cat="lanthanide"] { background: #bfe8f0; }
.pt-grid[data-color="category"] .pt-cell[data-cat="actinide"]   { background: #e0cef5; }
.pt-grid[data-color="category"] .pt-cell[data-cat="post"]       { background: #c6ece1; }
.pt-grid[data-color="category"] .pt-cell[data-cat="metalloid"]  { background: #e2efb0; }
.pt-grid[data-color="category"] .pt-cell[data-cat="nonmetal"]   { background: #c4eeba; }
.pt-grid[data-color="category"] .pt-cell[data-cat="halogen"]    { background: #fff0a6; }
.pt-grid[data-color="category"] .pt-cell[data-cat="noble"]      { background: #d8d4f5; }

/* ---- 分区着色 ---- */
.pt-grid[data-color="block"] .pt-cell[data-block="s"]  { background: #ffccd3; }
.pt-grid[data-color="block"] .pt-cell[data-block="p"]  { background: #cfecc4; }
.pt-grid[data-color="block"] .pt-cell[data-block="d"]  { background: #c9e1f5; }
.pt-grid[data-color="block"] .pt-cell[data-block="ds"] { background: #ffe0b8; }
.pt-grid[data-color="block"] .pt-cell[data-block="f"]  { background: #e8cef0; }

/* ============ 图例 ============ */
.pt-legend { display: flex; flex-wrap: wrap; gap: 6px 14px; margin: 0 0 22px; }
.pt-legend-item {
    display: inline-flex; align-items: center; gap: 5px; cursor: pointer;
    border: 1px solid transparent; border-radius: 6px; background: transparent;
    padding: 3px 7px; font-size: 12.5px; color: var(--learn-ink-light);
    transition: border-color .15s ease, background .15s ease;
}
.pt-legend-item:hover { background: #fff; border-color: var(--learn-border); }
.pt-legend-item.active { border-color: var(--learn-ink); color: var(--learn-ink); font-weight: 600; }
.pt-swatch { width: 14px; height: 14px; border-radius: 3px; display: inline-block; flex-shrink: 0; }
.cat-h { background: #d7f0e0; } .cat-alkali { background: #ffd2bd; } .cat-alkaline { background: #ffe6ad; }
.cat-transition { background: #ffd3df; } .cat-lanthanide { background: #bfe8f0; } .cat-actinide { background: #e0cef5; }
.cat-post { background: #c6ece1; } .cat-metalloid { background: #e2efb0; } .cat-nonmetal { background: #c4eeba; }
.cat-halogen { background: #fff0a6; } .cat-noble { background: #d8d4f5; }
.block-s.pt-swatch { background: #ffccd3; } .block-p.pt-swatch { background: #cfecc4; }
.block-d.pt-swatch { background: #c9e1f5; } .block-ds.pt-swatch { background: #ffe0b8; } .block-f.pt-swatch { background: #e8cef0; }

/* ============ 详情面板 ============ */
.pt-detail {
    background: var(--learn-card); border: 1px solid var(--learn-border);
    border-radius: 12px; padding: 18px 20px; margin: 0 0 34px;
    min-height: 60px; transition: background .2s ease;
}
.pt-detail-empty { color: var(--learn-ink-light); font-size: 14px; text-align: center; padding: 14px 0; }
.pt-detail-empty .bi { color: var(--learn-accent); }
.pt-detail.show { display: grid; grid-template-columns: 132px 1fr; gap: 22px; align-items: start; }
.pt-d-left { text-align: center; }
.pt-d-z { font-size: 13px; color: var(--learn-ink-light); }
.pt-d-sym { font-size: 46px; font-weight: 800; line-height: 1; margin: 2px 0; }
.pt-d-name { font-size: 18px; font-weight: 600; }
.pt-d-py { display: block; font-size: 13px; color: var(--learn-ink-light); font-weight: 400; margin-top: 2px; }
.pt-d-play {
    margin-top: 10px; border: 1px solid var(--learn-accent); background: #fff; color: var(--learn-accent);
    border-radius: 999px; padding: 5px 14px; font-size: 13px; cursor: pointer;
    display: inline-flex; align-items: center; gap: 5px;
}
.pt-d-play:hover { background: var(--learn-accent-soft); }
.pt-d-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 18px; }
.pt-d-field { display: flex; justify-content: space-between; gap: 10px; border-bottom: 1px dashed var(--learn-border); padding-bottom: 5px; }
.pt-d-k { font-size: 13px; color: var(--learn-ink-light); white-space: nowrap; }
.pt-d-v { font-size: 14px; font-weight: 600; text-align: right; }
.pt-d-use { margin-top: 14px; font-size: 14px; color: var(--learn-ink); background: var(--learn-mirror); border-radius: 8px; padding: 10px 12px; }
.pt-d-use .bi { color: #e0a300; }
/* 详情面板按选中元素分类淡染背景 */
.cat-bg-h { background: #f1faf4; } .cat-bg-alkali { background: #fff5f0; } .cat-bg-alkaline { background: #fffaef; }
.cat-bg-transition { background: #fff5f8; } .cat-bg-lanthanide { background: #f1fafc; } .cat-bg-actinide { background: #faf6fe; }
.cat-bg-post { background: #f2fbf8; } .cat-bg-metalloid { background: #fafdf0; } .cat-bg-nonmetal { background: #f3fcf1; }
.cat-bg-halogen { background: #fffdf2; } .cat-bg-noble { background: #f8f7fe; }

/* ============ 顺口溜 ============ */
.pt-mnem {
    background: linear-gradient(135deg, #2f7d4f, #266a42); color: #fff;
    border-radius: 14px; padding: 22px 24px; margin: 0 0 40px;
}
.pt-mnem h2 { font-size: 19px; margin: 0 0 14px; color: #fff; }
.pt-mnem-lyrics { font-size: 24px; font-weight: 600; letter-spacing: 1px; line-height: 1.9; }
.pt-mnem-char { transition: color .12s ease, text-shadow .12s ease; padding: 0 1px; }
.pt-mnem-char.active { color: #ffe27a; text-shadow: 0 0 14px rgba(255,226,122,.7); }
.pt-mnem-punc { opacity: .55; }
.pt-mnem-audio { margin: 14px 0 6px; }
.pt-mnem-play {
    border: 0; background: rgba(255,255,255,.18); color: #fff; cursor: pointer;
    border-radius: 999px; padding: 8px 18px; font-size: 14px;
    display: inline-flex; align-items: center; gap: 6px; transition: background .15s ease;
}
.pt-mnem-play:hover { background: rgba(255,255,255,.3); }
.pt-mnem-explain { font-size: 14px; opacity: .92; margin: 12px 0 0; line-height: 1.8; }

/* ============ 分区规律卡片 ============ */
.pt-section-lead { font-size: 14.5px; color: var(--learn-ink-light); margin: 0 0 16px; }
.pt-blocks-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; }
.pt-block-card { border-radius: 10px; padding: 14px 16px; border: 1px solid var(--learn-border); }
.pt-block-card.block-s  { background: #fff4f5; border-color: #ffd0d6; }
.pt-block-card.block-p  { background: #f4fbf1; border-color: #cfecc4; }
.pt-block-card.block-d  { background: #f1f8fd; border-color: #c9e1f5; }
.pt-block-card.block-ds { background: #fff8ef; border-color: #ffe0b8; }
.pt-block-card.block-f  { background: #fbf4fd; border-color: #e8cef0; }
.pt-block-key { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.pt-block-desc { font-size: 13.5px; color: var(--learn-ink-light); line-height: 1.65; }

/* ============ 门捷列夫 ============ */
.pt-mendeleev p { font-size: 15px; color: var(--learn-ink); line-height: 1.85; margin: 0; }

/* ============ 练习（沿用 learn 风格） ============ */
.ptp-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 8px; }
.ptp-badge { font-size: 14px; color: var(--learn-accent); background: var(--learn-accent-soft); border-radius: 999px; padding: 4px 12px; font-weight: 600; }
.ptp-title-row { font-size: 13px; color: var(--learn-ink-light); margin-bottom: 12px; }
.ptp-title-row strong { color: var(--learn-accent); }
.ptp-title-max { margin-left: 6px; opacity: .7; }
.ptp-title-next { margin-left: 8px; opacity: .75; }
.ptp-title-hint { color: var(--learn-accent); }
.ptp-title-hint .bi { margin-right: 3px; }
.ptp-card { background: var(--learn-card); border: 1px solid var(--learn-border); border-radius: 12px; padding: 22px; min-height: 120px; }
.ptp-badge.pulse { animation: ptpPulse .4s ease; }
@keyframes ptpPulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.18); } }
.ptp-q { font-size: 17px; font-weight: 600; line-height: 1.6; margin-bottom: 14px; }
.ptp-lv { display: inline-block; font-size: 11px; font-weight: 700; color: #fff; border-radius: 5px; padding: 1px 7px; margin-right: 8px; vertical-align: middle; }
.ptp-lv1 { background: var(--learn-accent); }
.ptp-lv2 { background: #d98a2b; }
.ptp-lv3 { background: #7a5bd0; }
.ptp-opts { display: grid; gap: 10px; }
@media (min-width: 520px) { .ptp-opts { grid-template-columns: 1fr 1fr; } }
.ptp-opt {
    border: 1.5px solid var(--learn-border); background: #fff; border-radius: 10px;
    padding: 12px 14px; font-size: 15px; cursor: pointer; text-align: left; color: var(--learn-ink);
    transition: border-color .15s ease, background .15s ease;
}
@media (hover: hover) { .ptp-opt:hover:not(:disabled) { border-color: var(--learn-accent); background: var(--learn-accent-soft); } }
.ptp-opt:disabled { cursor: default; }
.ptp-opt.right { border-color: var(--learn-accent); background: #eaf6ea; font-weight: 700; }
.ptp-opt.wrong { border-color: #d9534f; background: #fbeaea; }
.ptp-fb { margin-top: 14px; font-size: 14px; line-height: 1.7; color: var(--learn-ink-light); }
.ptp-fb .ptp-ok { color: var(--learn-accent); font-weight: 700; }
.ptp-fb .ptp-no { color: #d9534f; font-weight: 700; }
.ptp-next { display: block; margin: 14px 0 0 auto; background: var(--learn-accent); color: #fff; border: none; padding: 9px 20px; border-radius: 999px; font-size: 15px; cursor: pointer; }
.ptp-next:hover { filter: brightness(1.07); }
.ptp-unlock { margin-top: 12px; padding: 10px 14px; background: var(--learn-accent-soft); border: 1px dashed var(--learn-accent); border-radius: 10px; font-size: 14px; }
.ptp-unlock strong { color: var(--learn-accent); }
.ptp-share { margin-left: 10px; background: #fff; border: 1.5px solid var(--learn-accent); color: var(--learn-accent); border-radius: 999px; padding: 4px 14px; font-size: 13px; cursor: pointer; }
.ptp-fly {
    position: fixed; z-index: 9999; pointer-events: none;
    font-weight: 800; font-size: 20px; color: var(--learn-accent);
    transform: translate(-50%, -50%); transition: transform .6s cubic-bezier(.4,0,.2,1), opacity .6s ease;
    text-shadow: 0 1px 3px rgba(0,0,0,.15);
}

/* ============ 完整清单表 ============ */
.pt-table-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.pt-print-btn {
    border: 1px solid var(--learn-border); background: #fff; cursor: pointer;
    border-radius: 8px; padding: 7px 14px; font-size: 13.5px; color: var(--learn-ink-light);
    display: inline-flex; align-items: center; gap: 5px;
}
.pt-print-btn:hover { border-color: var(--learn-accent); color: var(--learn-accent); }
.pt-table-scroll { overflow-x: auto; border: 1px solid var(--learn-border); border-radius: 10px; }
.pt-table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 720px; }
.pt-table th { background: var(--learn-mirror); text-align: left; padding: 9px 10px; font-weight: 600; color: var(--learn-ink-light); position: sticky; top: 0; }
.pt-table td { padding: 8px 10px; border-top: 1px solid var(--learn-border); }
.pt-table tbody tr:hover { background: var(--learn-accent-soft); }
.pt-td-z { color: var(--learn-ink-light); }
.pt-td-sym { font-weight: 700; }
.pt-td-py { color: var(--learn-ink-light); }
.pt-td-use { color: var(--learn-ink-light); min-width: 220px; }

/* ============ 分享本页 ============ */
.pt-sharepage { text-align: center; }
.pt-sharepage-btn {
    border: 1px solid var(--learn-accent); background: var(--learn-accent-soft); color: var(--learn-accent);
    border-radius: 999px; padding: 9px 22px; font-size: 14.5px; cursor: pointer;
    display: inline-flex; align-items: center; gap: 7px;
}
.pt-sharepage-btn:hover { background: var(--learn-accent); color: #fff; }
.pt-sharepage-tip { display: block; font-size: 13px; color: var(--learn-ink-light); margin-top: 8px; min-height: 18px; }

/* 报错按钮：适度提升可见性（描边色，一眼可点；仍明显弱于分享）—— 仅覆盖本页，不动共享 partial */
.pt-body .re-disclaimer .re-btn {
    border-color: var(--learn-accent); color: var(--learn-accent);
    font-size: 13px; padding: 4px 14px;
}
.pt-body .re-disclaimer .re-btn:hover:not(:disabled) {
    background: var(--learn-accent); color: #fff; border-color: var(--learn-accent);
}

.pt-sources summary { cursor: pointer; font-weight: 600; }
.pt-sources p { font-size: 13.5px; color: var(--learn-ink-light); margin: 8px 0 0; word-break: break-all; }

/* ============ 响应式 ============ */
@media (max-width: 640px) {
    .pt-grid { grid-template-columns: repeat(18, 40px); grid-auto-rows: 46px; min-width: 740px; }
    .pt-sym { font-size: 15px; }
    .pt-name { font-size: 9px; }
    .pt-detail.show { grid-template-columns: 1fr; gap: 14px; }
    .pt-d-left { display: flex; align-items: center; gap: 14px; text-align: left; }
    .pt-d-sym { font-size: 38px; }
    .pt-d-play { margin-top: 0; margin-left: auto; }
    .pt-d-grid { grid-template-columns: 1fr; }
    .pt-mnem-lyrics { font-size: 20px; }
}

/* ============ 打印 ============ */
@media print {
    .learn-nav, .pt-toolbar, .pt-legend, .pt-detail, .pt-mnem-audio,
    .pt-practice, .pt-sharepage, .pt-print-btn, .report-error-section,
    .pt-toolbar-hint { display: none !important; }
    .pt-page { max-width: 100%; }
    .pt-grid-wrap, .pt-table-scroll { overflow: visible; }
    .pt-grid { min-width: 0; }
    .pt-cell, .pt-block-card, .pt-mnem { -webkit-print-color-adjust: exact; print-color-adjust: exact; }
    .pt-mnem { background: #2f7d4f !important; }
    body { background: #fff; }
}