/* 数学公式专题：沿用 phrases/plurals 的左右工作区模式，mform- 前缀。 */

/* ── 渐变标题卡 + 学段切换 ─────────────────────────────────────────── */
.mform-hero { display: flex; flex-wrap: wrap; align-items: flex-end; gap: 22px 40px; padding: 34px 40px; margin: 24px 0 10px; border-radius: 26px; background: radial-gradient(120% 140% at 100% 0%, #fdeedd 0%, #fbe8d2 40%, #f5f8ef 100%); border: 1px solid #f0dfc8; }
.mform-hero-copy { flex: 1 1 320px; }
.mform-hero-copy .eyebrow { margin: 0; color: var(--orange); font-weight: 700; font-size: 15px; letter-spacing: .04em; }
.mform-hero-copy h1 { margin: 6px 0 10px; font-size: 42px; line-height: 1.15; color: var(--ink); }
.mform-hero-lead { margin: 0; color: var(--muted); font-size: 16px; max-width: 560px; }
.mform-stages { display: grid; gap: 10px; }
.mform-stage { display: grid; grid-template-columns: auto auto; grid-template-rows: auto auto; column-gap: 10px; align-items: center; padding: 10px 18px; border: 1px solid #ecd9bd; border-radius: 16px; background: var(--white); text-decoration: none; min-width: 190px; }
.mform-stage:hover { border-color: var(--orange); }
.mform-stage.on { border-color: var(--orange); background: #fff6ec; box-shadow: 0 2px 0 #ecd9bd; }
.mform-stage-emoji { grid-row: 1 / 3; font-size: 30px; line-height: 1; }
.mform-stage-name { font-weight: 800; font-size: 19px; color: var(--ink); display: flex; align-items: center; gap: 8px; }
.mform-stage-count { color: var(--muted); font-size: 13.5px; }
.mform-wip { font-style: normal; font-size: 12px; padding: 1px 8px; border-radius: 999px; background: #f3e6fb; color: #7d4fa3; font-weight: 600; }

/* ── 左右工作区：左 sticky 章节导航 + 搜索，右公式组卡流 ───────────── */
.mform-workspace { display: grid; grid-template-columns: minmax(320px, 380px) minmax(0, 1fr); gap: 22px; align-items: start; margin: 16px 0 30px; }
.mform-side { position: sticky; top: 16px; display: grid; gap: 14px; }
.mform-nav { display: grid; gap: 6px; padding: 12px; border: 1px solid var(--line); border-radius: 18px; background: var(--white); }
.mform-nav-link { display: flex; align-items: center; gap: 10px; padding: 9px 12px; border-radius: 12px; text-decoration: none; color: var(--ink); font-size: 16px; }
.mform-nav-link:hover { background: var(--soft); }
.mform-nav-link.on { background: #fff1e4; color: var(--orange); font-weight: 700; }
.mform-nav-emoji { font-size: 20px; line-height: 1; }
.mform-nav-title { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mform-nav-count { font-style: normal; font-size: 13px; color: var(--muted); background: var(--soft); border-radius: 999px; padding: 1px 9px; }
.mform-nav-link.on .mform-nav-count { background: #ffe0c4; color: var(--orange); }
.mform-side-tools { display: grid; gap: 8px; padding: 12px 14px; border: 1px dashed #d8c9b4; border-radius: 16px; background: var(--white); }
.mform-search { width: 100%; min-height: 44px; padding: 8px 14px; border: 1px solid var(--line); border-radius: 12px; font-size: 16px; background: var(--paper); }
.mform-search:focus { outline: 2px solid var(--orange); outline-offset: 1px; }
.mform-count { color: var(--muted); font-size: 14px; }
.mform-count b { color: var(--orange); }

/* ── 右栏：章节头 + 公式组卡 ──────────────────────────────────────── */
.mform-main { min-width: 0; display: grid; gap: 16px; }
.mform-chapter-head { display: flex; gap: 14px; align-items: center; padding: 18px 24px; border-radius: 20px; background: linear-gradient(120deg, #fff4e6, var(--white)); border: 1px solid #f0dfc8; }
.mform-chapter-emoji { font-size: 38px; line-height: 1; }
.mform-chapter-head h2 { margin: 0; font-size: 26px; color: var(--ink); }
.mform-chapter-head p { margin: 4px 0 0; color: var(--muted); font-size: 15px; }

.mform-group { padding: 20px 24px; border: 1px solid var(--line); border-radius: 20px; background: var(--white); }
.mform-group h3 { margin: 0; font-size: 20px; color: var(--green); display: flex; align-items: center; gap: 10px; }
.mform-group h3::before { content: ''; width: 8px; height: 22px; border-radius: 4px; background: var(--orange); flex: none; }
.mform-group-note { margin: 8px 0 0; padding: 8px 14px; border-radius: 12px; background: var(--soft); color: var(--muted); font-size: 14.5px; }
.mform-rows { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.mform-row { display: grid; grid-template-columns: minmax(120px, 190px) minmax(0, 1fr); gap: 4px 18px; align-items: baseline; padding: 9px 14px; border-radius: 12px; background: var(--paper); }
.mform-row:nth-child(odd) { background: #fbfdf8; }
.mform-row-name { color: var(--muted); font-size: 15.5px; }
.mform-row-formula { font-size: 19px; font-weight: 700; color: var(--ink); overflow-wrap: anywhere; }
.mform-row[data-mform-hit] { outline: 2px solid #f5b26b; outline-offset: -2px; }

.mform-empty { margin: 0; padding: 20px; border: 1px dashed var(--line); border-radius: 16px; color: var(--muted); text-align: center; }
.mform-pager { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.mform-pager-link { display: inline-flex; align-items: center; gap: 8px; padding: 10px 18px; border-radius: 14px; background: var(--white); border: 1px solid var(--line); color: var(--green); font-weight: 600; text-decoration: none; }
.mform-pager-link:hover { border-color: var(--green); }
.mform-pager-right { margin-left: auto; }
.mform-foot { margin: 0 0 8px; color: var(--muted); font-size: 14px; }

@media (max-width: 860px) {
  .mform-workspace { grid-template-columns: minmax(0, 1fr); }
  .mform-side { position: static; }
  .mform-hero { padding: 26px 24px; }
  .mform-hero-copy h1 { font-size: 34px; }
  .mform-stages { grid-template-columns: 1fr; width: 100%; }
  .mform-row { grid-template-columns: minmax(0, 1fr); }
}