/* =====================================================================
 * 56 · 宠物牵引绳 —— 独立视觉：工程制图 / 量体软尺
 * 骨架：软尺刻度 / 双组结构切换 / 受力示意 SVG / 四档尺码表 / 拉力档
 * 配色：靛蓝钢灰，细网格底纹，与前面五页完全不同
 * ===================================================================== */
.ph-page {
    --ph-indigo: #2f5fc0;
    --ph-indigo-deep: #21458f;
    --ph-indigo-soft: #eaf0fc;
    --ph-indigo-line: #c6d5f2;
    --ph-steel: #5b7397;
    --ph-paper: #ffffff;
    --ph-paper-2: #f6f8fd;
    --ph-ink: #172642;
    --ph-ink-2: #475b7c;
    --ph-ink-3: #8a9ab6;
    --ph-line: #dfe6f2;
    --ph-amber: #a9751c;
    --ph-amber-soft: #fbf2e0;
    --ph-red: #ac3f4c;
    --ph-red-soft: #fbeaec;
    --ph-grid: rgba(47, 95, 192, .055);
    background: var(--hg6-c-bg);
}
:root[data-theme="dark"] .ph-page {
    --ph-indigo: #84a9ff;
    --ph-indigo-deep: #adc6ff;
    --ph-indigo-soft: #1a2740;
    --ph-indigo-line: #2f4671;
    --ph-steel: #8fa8ce;
    --ph-paper: var(--hg6-paper);
    --ph-paper-2: var(--hg6-paper-2);
    --ph-ink: var(--hg6-ink);
    --ph-ink-2: var(--hg6-ink-2);
    --ph-ink-3: var(--hg6-ink-3);
    --ph-line: var(--hg6-line);
    --ph-amber: #e3b76b;
    --ph-amber-soft: #322617;
    --ph-red: #f096a0;
    --ph-red-soft: #352025;
    --ph-grid: rgba(132, 169, 255, .05);
}
.ph-page h1, .ph-page h2, .ph-page h3 { font-family: var(--hg6-font); letter-spacing: var(--hg6-tracking); color: var(--ph-ink); }
.ph-page p { font-size: var(--hg6-fz-body); line-height: var(--hg6-lh); color: var(--ph-ink-2); }
.ph-page b { color: var(--ph-ink); }
.ph-page small { font-size: var(--hg6-fz-xs); color: var(--ph-ink-3); font-weight: 400; }
.ph-page code { font: 500 12.5px/1.6 var(--hg6-num); background: var(--ph-indigo-soft); color: var(--ph-indigo-deep); padding: 1px 5px; border-radius: 4px; }
.ph-inner { padding-top: 22px; }

/* ---------- 首屏：软尺 ---------- */
.ph-hero {
    display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 30px;
    background-color: var(--ph-paper);
    background-image: linear-gradient(var(--ph-grid) 1px, transparent 1px), linear-gradient(90deg, var(--ph-grid) 1px, transparent 1px);
    background-size: 22px 22px;
    border: 1px solid var(--ph-line); border-top: 4px solid var(--ph-indigo);
    border-radius: var(--hg6-r-l); padding: 34px 34px 30px; box-shadow: var(--hg6-sh-2);
}
.ph-kicker { font: 600 11px/1.4 var(--hg6-num); letter-spacing: .16em; color: var(--ph-indigo-deep); text-transform: uppercase; }
.ph-hero h1 { font-size: var(--hg6-fz-h1); font-weight: 780; line-height: 1.28; margin: 14px 0 15px; }
.ph-lead { font-size: var(--hg6-fz-lead) !important; line-height: 1.9 !important; max-width: 62ch; margin: 0 0 20px; }
.ph-lead b { border-bottom: 2px solid var(--ph-indigo-line); }
.ph-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.ph-tags span { font-size: var(--hg6-fz-sm); padding: 6px 13px; border: 1px solid var(--ph-indigo-line); background: var(--ph-paper); color: var(--ph-ink-2); border-radius: 4px; }
.ph-tape { align-self: center; padding: 14px 16px; border: 1px solid var(--ph-indigo-line); border-radius: 10px; background: var(--ph-paper-2); }
.ph-tape-hd, .ph-tape-ft { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; font: 600 10px/1.4 var(--hg6-num); letter-spacing: .1em; color: var(--ph-ink-3); }
.ph-tape-ft { margin-top: 8px; padding-top: 8px; border-top: 1px solid var(--ph-line); letter-spacing: 0; }
.ph-tape-ft span { font-family: var(--hg6-font); font-weight: 500; font-size: 11px; }
.ph-tape-ft b { font: 700 17px/1.2 var(--hg6-num); color: var(--ph-indigo-deep); }
.ph-tape-svg { width: 100%; height: auto; margin: 8px 0; }
.ph-tape-bg { fill: var(--ph-paper); stroke: var(--ph-indigo-line); }
.ph-tape-ticks path { stroke: var(--ph-indigo); stroke-width: 1.2; }
.ph-tape-ticks text { fill: var(--ph-ink-3); font: 500 8px var(--hg6-num); }

/* ---------- 首屏操作入口 ---------- */
.ph-quick { margin-top: 16px; padding: 24px 30px 26px; border: 1px solid var(--ph-line); border-radius: var(--hg6-r-l); background: var(--ph-paper); box-shadow: var(--hg6-sh-1); }
.ph-quick-hd, .ph-panel-hd { display: flex; align-items: center; gap: 10px; margin-bottom: 18px; }
.ph-quick-hd h2, .ph-panel-hd h2 { font-size: var(--hg6-fz-h2); font-weight: 720; margin: 0; }
.ph-quick-hd small, .ph-panel-hd small { margin-left: auto; }
.ph-quick-hd h2 span, .ph-panel-hd > span { display: inline-flex; align-items: center; justify-content: center; min-width: 26px; height: 24px; margin-right: 4px; border-radius: 4px; background: var(--ph-indigo-soft); color: var(--ph-indigo-deep); font: 700 11px/1 var(--hg6-num); }
.ph-quick-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.ph-field > span { display: block; font-size: var(--hg6-fz-sm); font-weight: 600; color: var(--ph-ink-2); margin-bottom: 6px; }
.ph-field input, .ph-page textarea { width: 100%; font: 700 18px/1.4 var(--hg6-num); color: var(--ph-ink); background: var(--ph-paper-2); border: 1px solid var(--ph-line); border-radius: 8px; padding: 9px 11px; outline: none; }
.ph-field input:focus, .ph-page textarea:focus { border-color: var(--ph-indigo); box-shadow: 0 0 0 3px var(--ph-indigo-soft); }
.ph-struct { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; margin-top: 18px; padding-top: 16px; border-top: 1px dashed var(--ph-line); }
.ph-struct-group > span { display: block; font-size: var(--hg6-fz-xs); font-weight: 600; color: var(--ph-ink-3); margin-bottom: 7px; letter-spacing: .08em; }
.ph-struct-group > div { display: flex; gap: 6px; }
.ph-struct-group button { cursor: pointer; padding: 8px 16px; font: 600 13px/1.4 var(--hg6-font); border: 1px solid var(--ph-line); border-radius: 7px; background: var(--ph-paper-2); color: var(--ph-ink-2); transition: all .18s ease; }
.ph-struct-group button:hover { border-color: var(--ph-indigo-line); }
.ph-struct-group button.is-on { background: var(--ph-indigo); border-color: var(--ph-indigo); color: #fff; }
.ph-toggle { display: inline-flex; align-items: center; gap: 7px; font-size: var(--hg6-fz-sm); color: var(--ph-ink-2); cursor: pointer; margin-left: auto; }
.ph-toggle input { accent-color: var(--ph-indigo); }
.ph-act { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 18px; }
.ph-btn { font: 600 14px/1.4 var(--hg6-font); cursor: pointer; padding: 10px 20px; border: 1px solid var(--ph-indigo-line); border-radius: 8px; background: var(--ph-paper); color: var(--ph-indigo-deep); transition: all .18s ease; }
.ph-btn:hover { background: var(--ph-indigo-soft); border-color: var(--ph-indigo); }
.ph-btn--main { background: var(--ph-indigo); border-color: var(--ph-indigo); color: #fff; box-shadow: 0 6px 16px rgba(47, 95, 192, .22); }
.ph-btn--main:hover { background: var(--ph-indigo-deep); color: #fff; }
.ph-btn--quiet { border-color: var(--ph-line); color: var(--ph-ink-2); }
.ph-demo { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; margin-left: auto; }
.ph-demo span { font-size: var(--hg6-fz-xs); color: var(--ph-ink-3); }
.ph-demo button { font: 500 12px/1.3 var(--hg6-font); padding: 5px 10px; cursor: pointer; border: 1px dashed var(--ph-indigo-line); border-radius: 999px; background: transparent; color: var(--ph-ink-2); }
.ph-demo button:hover { background: var(--ph-indigo-soft); }
.ph-err { margin-top: 11px; font-size: var(--hg6-fz-sm); color: var(--ph-red); }
.ph-err:not(:empty) { background: var(--ph-red-soft); border-left: 3px solid var(--ph-red); padding: 9px 12px; border-radius: 0 8px 8px 0; }

/* ---------- 三栏主体 ---------- */
.ph-body { display: grid; grid-template-columns: .95fr 1.15fr .9fr; gap: var(--hg6-gap); margin-top: var(--hg6-gap); align-items: start; }
.ph-panel { min-width: 0; border: 1px solid var(--ph-line); border-radius: var(--hg6-r-l); background: var(--ph-paper); padding: 22px 22px 24px; box-shadow: var(--hg6-sh-1); }
.ph-panel-hd { padding-bottom: 13px; border-bottom: 1px solid var(--ph-line); }
.ph-panel-hd h2 { font-size: 17px; }
.ph-diagram-svg { width: 100%; height: auto; }
.ph-body-shape { fill: var(--ph-indigo-soft); stroke: var(--ph-indigo-line); stroke-width: 1.5; }
.ph-head-shape { fill: var(--ph-paper-2); stroke: var(--ph-indigo-line); stroke-width: 1.5; }
.ph-strap { fill: none; stroke: var(--ph-indigo); stroke-width: 6; stroke-linecap: round; }
.ph-strap.is-hidden { opacity: .16; stroke-dasharray: 4 5; }
.ph-ring { fill: var(--ph-amber); stroke: var(--ph-paper); stroke-width: 2; }
.ph-leash { stroke: var(--ph-steel); stroke-width: 3; stroke-linecap: round; stroke-dasharray: 7 5; }
.ph-diagram-cap { fill: var(--ph-indigo-deep); font: 700 15px var(--hg6-num); }
.ph-diagram-note { margin: 10px 0 0; font-size: var(--hg6-fz-sm); }
.ph-size-table { width: 100%; border-collapse: collapse; font-size: var(--hg6-fz-sm); }
.ph-size-table th { text-align: left; padding: 8px 7px; background: var(--ph-paper-2); color: var(--ph-ink-3); font-weight: 600; border-bottom: 1px solid var(--ph-line); }
.ph-size-table td { padding: 9px 7px; border-bottom: 1px solid var(--ph-line); color: var(--ph-ink-2); font-family: var(--hg6-num); }
.ph-size-table td:first-child { font-weight: 700; color: var(--ph-ink); }
.ph-size-table tr.is-on td { background: var(--ph-indigo-soft); color: var(--ph-indigo-deep); }
.ph-size-table tr.is-on td:first-child { color: var(--ph-indigo-deep); }
.ph-verdict { margin-top: 15px; padding: 14px 15px; border-radius: 10px; background: var(--ph-indigo-soft); border: 1px solid var(--ph-indigo-line); }
.ph-verdict strong { display: block; font-size: 17px; color: var(--ph-indigo-deep); margin-bottom: 5px; }
.ph-verdict p { margin: 0; font-size: var(--hg6-fz-sm); }
.ph-strength-num { display: flex; align-items: baseline; gap: 9px; }
.ph-strength-num b { font: 700 38px/1.2 var(--hg6-num); color: var(--ph-indigo-deep); }
.ph-strength-num span { font-size: var(--hg6-fz-sm); color: var(--ph-ink-3); }
.ph-strength-note { margin: 8px 0 0; font-size: var(--hg6-fz-sm); }
.ph-checks { margin-top: 16px; padding-top: 14px; border-top: 1px dashed var(--ph-line); }
.ph-checks h3 { font-size: 15px; margin-bottom: 8px; }
.ph-checks ul { margin: 0; padding-left: 18px; }
.ph-checks li { font-size: var(--hg6-fz-sm); line-height: 1.85; color: var(--ph-ink-2); }
.ph-warns { margin-top: 14px; display: grid; gap: 7px; }
.ph-warn { font-size: var(--hg6-fz-sm); line-height: 1.7; padding: 8px 11px; border-radius: 8px; background: var(--ph-amber-soft); color: var(--ph-amber); border-left: 3px solid var(--ph-amber); }
.ph-warn--bad { background: var(--ph-red-soft); color: var(--ph-red); border-left-color: var(--ph-red); }

/* ---------- 批量 / 阅读 / 脚注 ---------- */
.ph-batch, .ph-read { margin-top: var(--hg6-gap); }
.ph-tip { margin-bottom: 12px; }
.ph-page textarea { resize: vertical; line-height: 1.75; font-size: 13px; font-weight: 500; }
.ph-batch-act { display: flex; flex-wrap: wrap; gap: 10px; margin: 13px 0 15px; }
.ph-table-wrap { overflow-x: auto; border: 1px solid var(--ph-line); border-radius: var(--hg6-r-m); }
.ph-table-wrap table { width: 100%; border-collapse: collapse; font-size: var(--hg6-fz-sm); min-width: 700px; }
.ph-table-wrap th { background: var(--ph-indigo-soft); color: var(--ph-indigo-deep); font-weight: 700; text-align: left; }
.ph-table-wrap th, .ph-table-wrap td { padding: 9px 11px; border-bottom: 1px solid var(--ph-line); white-space: nowrap; }
.ph-table-wrap td { color: var(--ph-ink-2); }
.ph-table-wrap tr:last-child td { border-bottom: none; }
.ph-empty { color: var(--ph-ink-3); text-align: center; padding: 18px; margin: 0; }
.ph-read { padding: 0 2px; }
.ph-read-hd { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.ph-read-hd h2 { font-size: var(--hg6-fz-h2); }
.ph-read-hd span { font-size: var(--hg6-fz-xs); color: var(--ph-ink-3); }
.ph-read-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.ph-read-grid p { margin: 0; padding: 17px 19px; border-radius: 8px; background: var(--ph-paper); border: 1px solid var(--ph-line); border-left: 3px solid var(--ph-indigo-line); }
.ph-read-grid p b { border-bottom: 2px solid var(--ph-indigo-line); }
.ph-foot { margin: 22px 2px 0; font-size: var(--hg6-fz-sm) !important; line-height: 1.85; color: var(--ph-ink-3) !important; }

@media (max-width: 1000px) {
    .ph-body { grid-template-columns: 1fr 1fr; }
    .ph-strength { grid-column: 1 / -1; }
    .ph-hero { grid-template-columns: 1fr; }
    .ph-quick-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
    .ph-hero, .ph-quick { padding: 22px 18px; border-radius: var(--hg6-r-m); }
    .ph-body, .ph-read-grid { grid-template-columns: 1fr; }
    .ph-panel { padding: 18px 16px 20px; }
    .ph-demo, .ph-toggle { margin-left: 0; width: 100%; }
    .ph-struct { gap: 14px; }
}