/* Hojas de práctica: 2 columnas, niveles de ayuda y mini-página */
.practice-head .lead { margin-bottom: 14px; }
.help-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 6px; }
.help-label { color: var(--muted, #7f979f); font-size: .8rem; margin-right: 4px; }
.help-pill { padding: 7px 12px; border: 1px solid var(--line-strong, rgba(166,199,212,.22)); border-radius: 999px; background: rgba(255,255,255,.03); color: var(--soft, #b6c8cb); font: 600 .82rem 'Manrope', system-ui, sans-serif; cursor: pointer; transition: .15s; }
.help-pill b { color: var(--blue, #79d6ff); margin-right: 2px; }
.help-pill:hover { border-color: var(--blue, #79d6ff); }
.help-pill.is-on { background: rgba(121,214,255,.14); border-color: var(--blue, #79d6ff); color: #eef8f5; }
.help-hint { flex-basis: 100%; color: var(--muted, #7f979f); font-size: .8rem; }

.pp-group h2 { margin-bottom: 14px; }
.pp-grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.pp-grid-problems { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.pp-cell { display: block; min-width: 0; }
.pp-item { position: relative; display: grid; grid-template-columns: 34px 1fr 22px; align-items: center; gap: 12px; width: 100%; min-height: 76px; padding: 14px 14px; border: 1px solid var(--line, rgba(166,199,212,.13)); border-radius: 12px; background: linear-gradient(145deg, rgba(14,27,38,.96), rgba(10,20,29,.98)); color: #eef8f5; text-align: left; font: inherit; cursor: pointer; transition: border-color .18s, transform .18s, background .18s; }
.pp-item:hover, .pp-item:focus-visible { border-color: var(--blue, #79d6ff); transform: translateY(-2px); outline: none; }
.pp-problem { align-items: start; font-size: .95rem; line-height: 1.55; color: var(--soft, #b6c8cb); }
.pp-num { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--line-strong, rgba(166,199,212,.22)); color: var(--blue, #79d6ff); font: 700 .82rem 'DM Mono', monospace; }
.pp-body { min-width: 0; overflow-x: auto; overflow-y: hidden; scrollbar-width: thin; font-size: 1.05rem; }
.pp-expr .pp-body { font-size: 1.12rem; }
.pp-body mjx-container { overflow: visible !important; }
.pp-state::after { content: '›'; color: var(--muted, #7f979f); font-size: 1.3rem; }
.pp-item.is-seen { border-color: rgba(94,232,166,.3); }
.pp-item.is-seen .pp-num { background: rgba(94,232,166,.14); border-color: rgba(94,232,166,.5); color: #5ee8a6; }

.pp-dialog { width: min(720px, calc(100vw - 24px)); max-height: calc(100vh - 32px); padding: 0; border: 1px solid var(--line-strong, rgba(166,199,212,.22)); border-radius: 18px; background: #0a141c; color: #eef8f5; box-shadow: 0 30px 90px rgba(0,0,0,.65); }
.pp-dialog::backdrop { background: rgba(2,4,6,.72); backdrop-filter: blur(3px); }
.pp-modal { display: flex; flex-direction: column; max-height: calc(100vh - 32px); }
.pp-modal-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 16px 20px 6px; }
.pp-modal-head h2 { margin: 0; font-size: 1.1rem; }
.pp-close { width: 34px; height: 34px; border: 1px solid var(--line-strong, rgba(166,199,212,.22)); border-radius: 10px; background: transparent; color: var(--soft, #b6c8cb); font-size: 1.3rem; line-height: 1; cursor: pointer; }
.pp-levelbar { display: flex; flex-wrap: wrap; gap: 6px; padding: 6px 20px 12px; border-bottom: 1px solid var(--line, rgba(166,199,212,.13)); }
.pp-levelbar .help-pill { padding: 5px 10px; font-size: .76rem; }
.pp-modal-body { flex: 1; overflow-y: auto; padding: 16px 20px; }
.pp-sec { margin-bottom: 18px; }
.pp-sec h3 { margin: 0 0 8px; color: var(--muted, #7f979f); font: 700 .72rem 'DM Mono', monospace; letter-spacing: .1em; text-transform: uppercase; }
.pp-statement { font-size: 1.12rem; line-height: 1.6; }
.pp-hints, .pp-steps { margin: 0; padding-left: 22px; display: grid; gap: 12px; }
.pp-steps li p { margin: 0 0 4px; color: var(--soft, #b6c8cb); }
.pp-math { overflow-x: auto; padding: 4px 0; }
.pp-comment { padding: 8px 12px; border-left: 3px solid #f6d88b; background: rgba(246,216,139,.07); border-radius: 6px; font-size: .9rem; }
.pp-soon { padding: 10px 12px; border: 1px dashed var(--line-strong, rgba(166,199,212,.22)); border-radius: 10px; color: var(--muted, #7f979f); font-size: .9rem; }
.pp-answer { padding: 14px 16px; border: 1px solid rgba(94,232,166,.35); border-radius: 12px; background: rgba(94,232,166,.07); font-size: 1.2rem; overflow-x: auto; }
.pp-modal-foot { display: flex; justify-content: space-between; gap: 10px; padding: 12px 20px; border-top: 1px solid var(--line, rgba(166,199,212,.13)); }
.pp-modal-foot button { padding: 8px 14px; border: 1px solid var(--line-strong, rgba(166,199,212,.22)); border-radius: 10px; background: rgba(255,255,255,.03); color: #eef8f5; font: 600 .85rem 'Manrope', system-ui, sans-serif; cursor: pointer; }
.pp-modal-foot button:disabled { opacity: .35; cursor: default; }
.pp-lock { overflow: hidden; }

@media (max-width: 720px) {
  .pp-grid, .pp-grid-problems { grid-template-columns: 1fr; }
  .pp-item { min-height: 66px; }
  .pp-dialog { width: calc(100vw - 16px); max-height: calc(100vh - 16px); }
  .pp-modal-head, .pp-levelbar, .pp-modal-body, .pp-modal-foot { padding-left: 14px; padding-right: 14px; }
}