/* EduFabTech — learn.css (31 Eki 2026): öğrenme bölümü. Önek ln-. Panolar / sekmeler electronics.css'ten (el-*). */
:root {
  --ln-sin: #f5c542; --ln-cos: #6cb8ff; --ln-tan: #ff7b9c; --ln-cot: #7ce0a3;
  --ln-red: #ff6b6b; --ln-blue: #7fb4ff; --ln-yellow: rgba(245, 197, 66, .22); --ln-pink: rgba(255, 123, 156, .22); --ln-bluefill: rgba(108, 184, 255, .2);
  --f-math: "STIX Two Text", "Cambria Math", "Times New Roman", Georgia, serif;
}

/* ── matematik dizgisi ── */
.m { font-family: var(--f-math); font-size: 1.08em; }
.ln-practice [hidden], .ln-interactive [hidden] { display: none !important; }   /* .btn / flex kaplar hidden'i ezmesin (invite-bar dersi) */
.m i { font-style: italic; }
.fr { display: inline-flex; flex-direction: column; vertical-align: middle; text-align: center; margin: 0 2px; line-height: 1.12; font-size: .9em; }
.fr > span:first-child { border-bottom: 1.3px solid currentColor; padding: 0 3px; }
.fr > span:last-child { padding: 0 3px; }
.rt { white-space: nowrap; }
.rt .rt-in { border-top: 1.3px solid currentColor; padding: 0 2px 0 1px; }
.ln-undef { color: var(--muted); font-style: italic; font-family: var(--sans); font-size: .9em; }

/* ── dizin ── */
.ln-subjects { margin-bottom: 28px; }
.ln-subject { display: flex; gap: 18px; align-items: flex-start; padding: 24px; color: inherit; text-decoration: none; }
.ln-subject h2 { margin: 0 0 6px; font-size: 22px; }
.ln-subject p { margin: 0 0 10px; color: var(--text-2); }
.ln-subject-ic { flex: 0 0 60px; width: 60px; height: 60px; display: grid; place-items: center; border-radius: 16px; font-family: var(--f-math); font-size: 30px; color: var(--brand); background: rgba(67,212,155,.08); border: 1px solid rgba(67,212,155,.25); }
.ln-subject-soon { opacity: .75; }
.ln-subject-soon .ln-subject-ic { color: var(--muted); background: transparent; border-color: var(--border); }
.ln-unit { margin: 0 0 30px; }
.ln-unit .band-head { margin-bottom: 14px; }
.ln-grid { align-items: stretch; }
.ln-card { display: flex; gap: 16px; align-items: flex-start; padding: 20px 22px; color: inherit; text-decoration: none; position: relative; overflow: hidden; }
.ln-card::after { content: ""; position: absolute; inset: 0; pointer-events: none; background: radial-gradient(420px 160px at 0% 0%, rgba(67,212,155,.10), transparent 70%); opacity: 0; transition: opacity var(--t); }
.ln-card:hover::after { opacity: 1; }
.ln-num { flex: 0 0 44px; width: 44px; height: 44px; display: grid; place-items: center; border-radius: 12px; font-family: var(--serif); font-size: 22px; font-weight: 600; color: var(--brand); background: rgba(67,212,155,.08); border: 1px solid rgba(67,212,155,.25); }
.ln-card-body { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.ln-card-body h3 { margin: 0; font-size: 18px; line-height: 1.3; }
.ln-card-body p { margin: 0; color: var(--text-2); font-size: 14.5px; }
.ln-chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 4px; }
.ln-progress { border-color: rgba(67,212,155,.4); color: var(--brand); }
.ln-progress-full { background: rgba(67,212,155,.15); }
.ln-card-sm { padding: 14px 16px; }
.ln-card-sm .ln-num { flex-basis: 34px; width: 34px; height: 34px; font-size: 17px; }
.ln-card-sm h3 { font-size: 15.5px; }
.ln-progress-line { margin-top: 6px; }

/* ── ders sayfası ── */
.ln-lesson { display: flex; flex-direction: column; gap: 34px; }
.ln-head .ln-meta { display: flex; flex-wrap: wrap; gap: 6px; margin: 12px 0 0; }
.ln-toc { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 14px; }
.ln-toc .chip { text-decoration: none; }
.ln-toc .chip:hover { border-color: var(--brand); color: var(--text); }
.ln-tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.ln-sec { scroll-margin-top: calc(var(--nav-h) + 12px); }
.ln-sec-head { margin-bottom: 14px; }
.ln-sec-head h2 { margin: 2px 0 6px; }
.ln-sec-head p { max-width: 70ch; }

/* kurallar */
.ln-rules { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 380px), 1fr)); gap: 16px; }
.ln-rulebox { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px 20px; display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.ln-rulebox h3 { margin: 0 0 2px; font-size: 16px; }
.ln-rule { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 4px 12px; padding-top: 10px; border-top: 1px dashed var(--border); align-items: baseline; }
.ln-rule:first-child, .ln-rulebox h3 + .ln-rule, .ln-rulebox .tbl + .ln-rule { border-top: 0; padding-top: 0; }
.ln-rule-what { font-weight: 600; font-size: 14.5px; }
.ln-rule-used { font-size: 12px; color: var(--muted); white-space: nowrap; }
.ln-rule-f { grid-column: 1 / -1; font-size: 16px; overflow-x: auto; line-height: 1.9; }
.ln-rule-f .muted { font-family: var(--sans); font-size: 13.5px; }
.ln-star { color: var(--ln-red); }
.tbl { overflow-x: auto; }
.ln-table { border-collapse: collapse; font-size: 15px; }
.ln-table th, .ln-table td { border: 1px solid var(--border); padding: 5px 10px; text-align: center; }
.ln-table th { font-size: 12.5px; color: var(--text-2); font-weight: 600; }
.ln-angles td { font-family: var(--f-math); font-size: 17px; }
.ln-method { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; }

/* etkileşim kutusu */
.ln-interactive { padding: 18px; }
.ln-interactive + .ln-rules { margin-top: 16px; }
.ln-uc, .ln-rt, .ln-geo { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 18px; align-items: start; }
.ln-geo-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.ln-geo-half h3 { margin: 0 0 8px; font-size: 15px; }
.ln-geo-half svg, .ln-uc-svg, .ln-rt-svg, .ln-geo-fig svg { width: 100%; height: auto; display: block; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; touch-action: none; }
.ln-uc-panel, .ln-rt-panel, .ln-geo-panel { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.ln-uc-deg { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.ln-uc-degout { font-size: 26px; font-weight: 600; color: var(--text); }
.ln-uc-btns { display: flex; flex-wrap: wrap; gap: 4px; }
.ln-abtn { padding: 5px 9px; border: 1px solid var(--border); border-radius: 8px; background: var(--card); color: var(--text-2); font: 600 12.5px/1 var(--mono); cursor: pointer; }
.ln-abtn:hover { color: var(--text); border-color: var(--border-2); }
.ln-abtn[aria-pressed="true"] { color: var(--brand); border-color: var(--brand); background: rgba(67,212,155,.12); }
.ln-uc-ctl { display: flex; flex-wrap: wrap; gap: 6px; }
.ln-uc-show { display: flex; flex-wrap: wrap; gap: 6px 14px; font-size: 14px; }
.ln-uc-show label { display: inline-flex; align-items: center; gap: 6px; cursor: pointer; font-weight: 600; }
.ln-uc-note { font-size: 13px; }
.ln-vals { width: 100%; font-size: 14px; }
.ln-vals td { text-align: left; padding: 4px 8px; }
.ln-vals tr.off { opacity: .4; }
.ln-vals .m { font-size: 16px; }
.ln-sign { display: inline-block; min-width: 22px; text-align: center; font-family: var(--mono); font-weight: 700; border: 1px solid var(--border); border-radius: 6px; padding: 0 4px; }
.ln-fn-sin { color: var(--ln-sin); } .ln-fn-cos { color: var(--ln-cos); } .ln-fn-tan { color: var(--ln-tan); } .ln-fn-cot { color: var(--ln-cot); }
.ln-check { display: inline-flex; align-items: center; gap: 8px; font-size: 14px; cursor: pointer; }
.ln-check input { width: 18px; height: 18px; accent-color: var(--brand); }
.ln-geo .el-out { grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); }
.ln-geo .el-field { display: flex; flex-direction: column; gap: 4px; }

/* SVG parçaları */
.ln-svg { width: 100%; max-width: 320px; height: auto; display: block; }
.ln-l { stroke: var(--text-2); stroke-width: 1.6; fill: none; stroke-linecap: round; }
.ln-axis { stroke: var(--border-2); stroke-width: 1.3; }
.ln-dash { stroke-dasharray: 5 4; stroke: var(--muted); }
.ln-red { stroke: var(--ln-red); stroke-width: 2.4; }
.ln-blue { stroke: var(--ln-blue); stroke-width: 2; }
.ln-fill { stroke: none; fill: rgba(255,255,255,.06); }
.ln-fill-y { fill: var(--ln-yellow); } .ln-fill-p { fill: var(--ln-pink); } .ln-fill-b { fill: var(--ln-bluefill); }
.ln-mark { stroke: var(--text-2); stroke-width: 1.3; fill: none; }
.ln-arc { stroke: var(--warn); stroke-width: 1.5; fill: none; }
.ln-dot { fill: var(--text); }
.ln-dot-g { fill: var(--brand); }
.ln-t { fill: var(--text); font: 600 13px var(--sans); }
.ln-t-ang { fill: var(--warn); font-size: 12px; }
.ln-t-red { fill: var(--ln-red); font-size: 15px; }
.ln-t-q { fill: var(--text-2); font-size: 12px; }
.ln-t-big { font-size: 14px; font-weight: 700; }
.ln-rt-side { fill: var(--text-2); font-weight: 500; font-size: 12.5px; }
.ln-fig-note { font-size: 12.5px; margin: 6px 0 0; }
.ln-uc-bg { fill: transparent; }
.ln-uc-quad { fill: transparent; transition: fill var(--t); }
.ln-uc-quad.on { fill: rgba(67,212,155,.07); }
.ln-guide { stroke: var(--border-2); stroke-width: 1; stroke-dasharray: 4 4; }
.ln-guide2 { stroke: var(--muted); stroke-width: 1; stroke-dasharray: 3 4; fill: none; }
.ln-uc-circle { stroke: var(--text-2); stroke-width: 1.6; fill: none; }
.ln-uc-tri { fill: rgba(255,255,255,.04); stroke: none; }
.ln-uc-ref { stroke: var(--muted); stroke-width: 1.2; stroke-dasharray: 3 3; fill: none; }
.ln-uc-arc { stroke: var(--warn); stroke-width: 1.6; fill: none; opacity: .35; }
.ln-uc-arc.on { opacity: 1; }
.ln-uc-arc2 { stroke: var(--ln-cot); }
.ln-uc-rad { stroke: var(--text); stroke-width: 2.2; fill: none; stroke-linecap: round; }
.ln-v { stroke-width: 3.2; fill: none; stroke-linecap: round; }
.ln-v-sin { stroke: var(--ln-sin); } .ln-v-cos { stroke: var(--ln-cos); } .ln-v-tan { stroke: var(--ln-tan); } .ln-v-cot { stroke: var(--ln-cot); }
.ln-uc-p { fill: var(--text); stroke: var(--bg); stroke-width: 2; }
.ln-uc-sdot { fill: var(--card-2); stroke: var(--text-2); stroke-width: 1.2; cursor: pointer; }
.ln-uc-sdot:hover { fill: var(--brand); }
.ln-uc-dl { font-size: 10px; fill: var(--muted); font-weight: 500; }
.ln-uc-axl { font-size: 11px; fill: var(--muted); font-weight: 500; }
.ln-uc-l { font-size: 12px; font-weight: 700; }
.l-sin { fill: var(--ln-sin); } .l-cos { fill: var(--ln-cos); } .l-tan { fill: var(--ln-tan); } .l-cot { fill: var(--ln-cot); }
.ln-rt-tri { fill: rgba(255,255,255,.05); stroke: var(--text-2); stroke-width: 1.6; stroke-linejoin: round; }
.ln-rt-hyp { stroke: var(--text); stroke-width: 2.2; }
.ln-handle { fill: rgba(67,212,155,.35); stroke: var(--brand); stroke-width: 1.5; cursor: grab; }
.ln-handle:active { cursor: grabbing; fill: rgba(67,212,155,.6); }

/* çözümlü örnekler */
.ln-qs { display: flex; flex-direction: column; gap: 18px; }
.ln-q { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 20px 22px; display: grid; grid-template-columns: minmax(0, 280px) minmax(0, 1fr); gap: 10px 22px; scroll-margin-top: calc(var(--nav-h) + 12px); }
.ln-q.nofig { grid-template-columns: minmax(0, 1fr); }
.ln-q-head { grid-column: 1 / -1; display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 12px; }
.ln-q-head h3 { margin: 0; font-size: 17px; }
.ln-q-num { font-family: var(--serif); font-weight: 600; font-size: 26px; color: var(--brand); line-height: 1; }
.ln-tag { font-size: 11px; text-transform: uppercase; letter-spacing: .08em; font-weight: 700; color: var(--muted); border: 1px solid var(--border); border-radius: 999px; padding: 2px 9px; }
.ln-ask { grid-column: 1 / -1; font-size: 16px; line-height: 1.9; }
.ln-ask p { margin: 0; }
.ln-fig { grid-row: 3; }
.ln-sol { display: flex; flex-direction: column; gap: 10px; min-width: 0; }
.ln-q.nofig .ln-sol { grid-column: 1 / -1; }
.ln-hint { margin: 0; padding: 8px 12px; border-left: 3px solid var(--ln-blue); background: rgba(127,180,255,.07); border-radius: 0 8px 8px 0; font-size: 14px; }
.ln-steps { border: 1px solid var(--border); border-radius: 10px; }
.ln-steps summary { padding: 10px 14px; cursor: pointer; font-weight: 600; color: var(--brand); list-style: none; }
.ln-steps summary::-webkit-details-marker { display: none; }
.ln-steps summary::before { content: "▸ "; }
.ln-steps[open] summary::before { content: "▾ "; }
.ln-steps ol { margin: 0; padding: 0 16px 6px 36px; display: flex; flex-direction: column; gap: 9px; line-height: 1.9; }
.ln-steps li .m { font-size: 1.06em; }
.ln-answer { margin: 6px 14px 14px; padding: 10px 14px; border: 1.5px solid var(--ln-red); border-radius: 10px; color: var(--text); font-size: 17px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.ln-answer-k { font: 700 11px var(--sans); text-transform: uppercase; letter-spacing: .1em; color: var(--ln-red); }

/* alıştırma */
.ln-practice { padding: 20px 22px; display: flex; flex-direction: column; gap: 12px; }
.ln-practice-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.ln-practice-head h2 { margin: 0; }
.ln-score { font-size: 18px; color: var(--brand); font-weight: 700; }
.ln-practice-prompt { margin: 0; font-size: 18px; line-height: 1.8; }
.ln-practice-opts { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 8px; }
.ln-opt { padding: 12px 10px; border: 1px solid var(--border-2); border-radius: 10px; background: var(--card-2); color: var(--text); font-size: 18px; cursor: pointer; transition: border-color var(--t), background var(--t); }
.ln-opt:hover:not(:disabled) { border-color: var(--brand); }
.ln-opt:disabled { cursor: default; opacity: .75; }
.ln-opt.right { border-color: var(--brand); background: rgba(67,212,155,.15); opacity: 1; }
.ln-opt.wrong { border-color: var(--err); background: rgba(239,106,98,.12); }
.ln-practice-in { display: flex; gap: 8px; align-items: center; }
.ln-practice-in .input { max-width: 240px; }
.ln-practice-fb { min-height: 1em; font-size: 15px; line-height: 1.75; }
.ln-practice-fb p { margin: 0; }
.ln-ok { color: var(--brand); } .ln-no { color: var(--err); }
.ln-round { margin-top: 8px !important; padding: 8px 12px; border: 1px dashed var(--border-2); border-radius: 10px; font-size: 14px; }
.ln-practice-bar { display: flex; gap: 8px; flex-wrap: wrap; }

/* ileri / geri */
.ln-nextprev { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.ln-np { display: flex; flex-direction: column; gap: 4px; padding: 14px 18px; color: inherit; text-decoration: none; font-weight: 600; }
.ln-np-next { text-align: right; align-items: flex-end; }
.ln-np .eyebrow { margin: 0; }

@media (max-width: 860px) {
  .ln-uc, .ln-rt, .ln-geo, .ln-geo-2 { grid-template-columns: minmax(0, 1fr); }
  .ln-q { grid-template-columns: minmax(0, 1fr); }
  .ln-fig { grid-row: auto; }
  .ln-svg { max-width: 100%; }
}
@media (max-width: 560px) {
  .ln-nextprev { grid-template-columns: minmax(0, 1fr); }
  .ln-np-next { text-align: left; align-items: flex-start; }
  .ln-q { padding: 16px; }
  .ln-practice-opts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .ln-uc-degout { font-size: 22px; }
}