/* Practice hub: quizzes and coding labs (uses the site's theme tokens, so light and dark both work) */
.ph { padding-top: 22px; padding-bottom: 60px; }
.ph [hidden] { display: none !important; }
.ph .crumbs { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.ph .crumbs a:hover { color: var(--ink); }
.ph-hero h1 { font-size: clamp(28px, 4vw, 40px); margin: 6px 0 10px; }
.ph-hero p { max-width: 70ch; color: var(--text); }
.ph-sub { color: var(--muted); margin: -6px 0 16px; }
.ph-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; margin: 22px 0; }
.ph-card, .ph-lesson, .ph-lab { display: block; border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); padding: 20px; box-shadow: var(--shadow); transition: border-color .15s, transform .15s; }
.ph-card:hover, .ph-lab:hover { border-color: var(--accent); transform: translateY(-2px); }
.ph-card h2 { margin: 6px 0 8px; font-size: 22px; }
.ph-ico { font-size: 30px; }
.ph-meta { margin-top: 12px; color: var(--muted); font-size: 14px; }
.ph-meta b { color: var(--ok); font-size: 18px; }
.ph-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; margin-top: 18px; }
.ph-lesson h3, .ph-lab h3 { margin: 4px 0 10px; font-size: 17px; }
.ph-lab p { margin: 0 0 10px; color: var(--muted); font-size: 14px; }
.ph-lab.done { border-color: var(--ok); background: linear-gradient(0deg, var(--ok-soft), var(--ok-soft)), var(--panel); }
.ph-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; align-items: center; }
.ph-actions .sp { flex: 1; }
.ph-lvl, .ph-track { display: inline-block; font-size: 12px; font-weight: 600; border-radius: 999px; padding: 2px 10px; border: 1px solid var(--line-strong); color: var(--muted); }
.ph-lvl.beginner { color: var(--ok); border-color: var(--ok); } .ph-lvl.intermediate { color: var(--warn); border-color: var(--warn); } .ph-lvl.advanced { color: var(--bad); border-color: var(--bad); }
.ph-search { display: block; margin-top: 14px; max-width: 420px; } .ph-search span { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.ph-search input { width: 100%; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line-strong); background: var(--panel); color: var(--ink); font: inherit; }
.ph-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.ph-tabs button { border: 1px solid var(--line-strong); background: var(--panel); border-radius: 999px; padding: 6px 14px; font-size: 14px; }
.ph-tabs button.on { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.ph-credit { margin-top: 28px; font-size: 13px; color: var(--muted); max-width: 90ch; } .ph-credit a { color: var(--link); text-decoration: underline; }

.ph-q { max-width: 760px; }
.ph-prog { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: 14px; }
.ph-bar { flex: 1; height: 6px; background: var(--line); border-radius: 6px; overflow: hidden; } .ph-bar i { display: block; height: 100%; background: var(--accent); }
.ph-qtext { font-size: 22px; margin: 16px 0; }
.ph-opts { display: grid; gap: 10px; }
.ph-opt { text-align: left; border: 1.5px solid var(--line-strong); background: var(--panel); border-radius: 12px; padding: 13px 16px; font-size: 16px; color: var(--ink); }
.ph-opt:hover:not(.locked) { border-color: var(--ink); }
.ph-opt.sel { border-color: var(--link); box-shadow: 0 0 0 2px var(--accent-soft); }
.ph-opt.right { border-color: var(--ok); background: var(--ok-soft); } .ph-opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.ph-ok { color: var(--ok); font-weight: 600; margin: 6px 0; } .ph-bad { color: var(--bad); margin: 6px 0; }
.ph-fb { min-height: 28px; margin-top: 12px; }
.ph-review { padding-left: 18px; } .ph-review li { margin-bottom: 14px; }

.ph-labpage { display: grid; grid-template-columns: minmax(280px, 5fr) minmax(320px, 7fr); gap: 24px; align-items: start; }
@media (max-width: 900px) { .ph-labpage { grid-template-columns: 1fr; } }
.ph-task h1 { font-size: 28px; margin: 10px 0 6px; } .ph-concept { color: var(--muted); }
.ph-prompt { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; margin: 12px 0; }
.ph-prompt code { background: var(--code-bg); padding: 1px 6px; border-radius: 6px; }
.ph-hintbox p { background: var(--warn-soft); border-radius: 10px; padding: 8px 12px; margin: 8px 0; }
.ph-ref { font-size: 13px; color: var(--muted); } .ph-ref a { color: var(--link); text-decoration: underline; overflow-wrap: anywhere; }
.ph-editor { border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); padding: 12px; min-width: 0; }
.ph-editor textarea { width: 100%; min-height: 300px; font-family: var(--mono); font-size: 14px; line-height: 1.5; background: var(--code-bg); color: var(--ink); border: 1px solid var(--line); border-radius: 10px; padding: 12px; resize: vertical; tab-size: 4; }
.ph-out { margin-top: 12px; font-family: var(--mono); font-size: 13px; min-height: 60px; }
.ph-out pre { white-space: pre-wrap; overflow-wrap: anywhere; background: var(--code-bg); border-radius: 10px; padding: 10px 12px; margin: 6px 0; }
.ph-out .err { color: var(--bad); } .ph-out .ok-msg { color: var(--ok); font-weight: 600; font-family: var(--font); font-size: 16px; } .ph-out .muted { color: var(--muted); font-family: var(--font); }
@media (max-width: 480px) { .ph { padding-left: 16px; padding-right: 16px; } .ph-qtext { font-size: 19px; } }

/* quiz-set tabs, sources page */
.ph-tab { display: inline-flex; gap: 8px; align-items: baseline; border: 1px solid var(--line-strong); background: var(--panel); border-radius: 999px; padding: 6px 16px; font-size: 14px; }
.ph-tab small { color: var(--muted); } .ph-tab.on { background: var(--ink); color: var(--bg); border-color: var(--ink); } .ph-tab.on small { color: inherit; opacity: .75; }
.ph-srcs { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 14px; margin-top: 18px; }
.ph-src { border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); padding: 16px 18px; }
.ph-src.imported { border-color: var(--ok); }
.ph-srchead { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; } .ph-srchead h3 { margin: 0; font-size: 16px; flex: 1 1 100%; } .ph-srchead h3 a:hover { text-decoration: underline; }
.ph-badge, .ph-lic { font-size: 12px; font-weight: 600; border-radius: 999px; padding: 2px 10px; border: 1px solid var(--line-strong); color: var(--muted); }
.ph-badge.imported { color: var(--ok); border-color: var(--ok); }
.ph-srcmeta, .ph-why { font-size: 14px; margin: 8px 0 0; } .ph-why { color: var(--muted); }

/* notebooks and course texts */
.ph-nb { display: block; border: 1px solid var(--line); border-radius: var(--r); background: var(--panel); padding: 16px 18px; }
.ph-nb h3 { margin: 0; font-size: 16px; flex: 1 1 100%; } .ph-nb code { font-size: 12px; overflow-wrap: anywhere; color: var(--muted); }
a.ph-txt:hover { border-color: var(--accent); }
.ph-filters { display: flex; flex-wrap: wrap; gap: 18px; align-items: end; margin-top: 8px; } .ph-check { font-size: 14px; display: flex; gap: 8px; align-items: center; }
.ph-h2 { margin: 34px 0 6px; font-size: 22px; }
.ph-reader { white-space: pre-wrap; overflow-wrap: anywhere; background: var(--code-bg); border: 1px solid var(--line); border-radius: 12px; padding: 18px; font-size: 14px; line-height: 1.6; max-width: 90ch; }