/* Inside6 Learn — layout and lesson engine styles (structure ported from the AI Teen engine) */
:root {
  --bg: #fbf7ef; --card: #fff; --ink: #2b2420; --muted: #74685e; --line: #ece3d4; --edge: #e2d4bd;
  --brand: #c2572b; --brand-ink: #8f3c1a; --gold: #d99a2b; --sun: #e7774a; --plum: #7a4fb0;
  --soft: #f6ecdc; --leaf: #fbe9df; --ok: #2d7a43; --bad: #c2412b;
  --lift: 0 2px 0 rgb(217 154 43 / .18), 0 18px 36px -26px rgb(160 100 40 / .55);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1b1815; --card: #24201c; --ink: #f1e9df; --muted: #b3a697; --line: #3a332c; --edge: #4a4037;
    --brand: #f08a5d; --brand-ink: #b8592f; --gold: #e8b552; --sun: #f39a74; --plum: #b48ae6;
    --soft: #2e2822; --leaf: #3a2a21; --ok: #7fd39a; --bad: #f08a7a; --lift: none;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 "Be Vietnam Pro", system-ui, sans-serif; }
a { color: inherit; }
h1, h2, h3, .logo { font-family: Lora, Georgia, serif; letter-spacing: -.005em; }
h1 { font-size: clamp(28px, 5vw, 42px); line-height: 1.2; margin: .2em 0; }
h2 { font-size: 24px; margin: 1.6em 0 .5em; } h3 { margin: .2em 0; }
.eyebrow { text-transform: uppercase; letter-spacing: .08em; font-size: 12px; font-weight: 700; color: var(--muted); }
.muted { color: var(--muted); }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 14px; padding: 12px 20px; background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); }
.logo { font-weight: 700; font-size: 20px; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.logo b { color: var(--brand); }
.logo .dot { width: 14px; height: 14px; border-radius: 50%; background: var(--brand); }
.ctx { display: flex; align-items: center; gap: 10px; min-width: 0; font-weight: 600; }
.ctx a { text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.csep { color: var(--edge); font-size: 22px; }
.top nav { margin-left: auto; display: flex; gap: 4px; }
.top nav a { text-decoration: none; padding: 6px 12px; border-radius: 99px; font-weight: 600; font-size: 14px; color: var(--muted); white-space: nowrap; }
.top nav a.on { background: var(--leaf); color: var(--brand); }
main { max-width: 1080px; margin: 0 auto; padding: 36px 16px 60px; }
main:has(.lesson) { max-width: 1200px; }
.foot { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 16px; border-top: 1px solid var(--line); }
.fnav { display: flex; justify-content: center; flex-wrap: wrap; gap: 6px; margin-bottom: 8px; }
.fnav a { text-decoration: none; font-weight: 600; padding: 6px 12px; border-radius: 99px; color: var(--muted); }
.fnav a.on { background: var(--leaf); color: var(--brand); }

.hero { border-radius: 28px; padding: 32px; background: linear-gradient(160deg, var(--leaf), var(--soft)); border: 1.5px solid var(--edge); }
.hero p { max-width: 640px; font-size: 18px; color: var(--muted); }
.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(290px, 1fr)); }
.card { background: var(--card); border: 1.5px solid var(--edge); border-radius: 20px; padding: 20px; box-shadow: var(--lift); }
a.card { text-decoration: none; display: block; transition: transform .15s; }
a.card:hover { transform: translateY(-3px); }
.chip { display: inline-block; font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 99px; background: var(--soft); margin: 2px 4px 2px 0; }
.cemoji { font-size: 40px; line-height: 1; }
.ccard { border-top: 6px solid var(--c); }
.ccard h3 { font-size: 20px; margin: 10px 0 6px; }
.prog { height: 6px; border-radius: 6px; background: var(--line); overflow: hidden; margin-top: 12px; }
.prog span { display: block; height: 100%; background: var(--c, var(--brand)); }
.q { font-weight: 600; font-size: 18px; }
.band { border-left: 5px solid var(--c, var(--brand)); padding: 14px 18px; border-radius: 14px; background: var(--card); border-top: 1px solid var(--line); border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); margin: 10px 0; }
.band .eyebrow { color: var(--c, var(--brand)); }
.bigidea { background: var(--leaf); border-radius: 16px; padding: 18px 20px; font-size: 17px; }
.lessonrow { display: flex; gap: 14px; align-items: center; margin: 10px 0; }
a.card.lessonrow { display: flex; }
.num { flex: none; width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; font-weight: 800; color: #fff; background: var(--c, var(--brand)); }
.num.done { background: var(--ok); }
.tag { flex: none; font-size: 11px; font-weight: 800; color: #fff; border-radius: 8px; padding: 4px 8px; height: max-content; min-width: 96px; text-align: center; }
.pager { display: flex; justify-content: space-between; gap: 10px; margin-top: 32px; flex-wrap: wrap; }
.btn { display: inline-flex; align-items: center; gap: 6px; text-decoration: none; font: inherit; font-weight: 700; padding: 10px 22px; border-radius: 13px; background: var(--brand); color: #fff; box-shadow: 0 3px 0 var(--brand-ink); border: 0; cursor: pointer; }
.btn.ghost { background: var(--card); color: var(--ink); border: 1px solid var(--line); box-shadow: none; }
.btn[disabled] { opacity: .45; cursor: not-allowed; }
table { width: 100%; border-collapse: collapse; background: var(--card); border-radius: 14px; overflow: hidden; border: 1.5px solid var(--edge); }
td, th { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { width: 160px; }
.twrap { overflow-x: auto; }
.cycle { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; }
.cycle div { border-radius: 16px; padding: 14px; color: #fff; }
.tree { font-size: 15px; }
.tree .node { border: 2px dashed var(--line); border-radius: 16px; padding: 12px 14px; margin: 8px 0; background: var(--card); }
.tree .node .node { margin-left: 18px; }
.tree .lbl { font-weight: 800; } .tree .lbl small { font-weight: 600; color: var(--muted); margin-left: 6px; }
.tree .ex { font-size: 14px; color: var(--muted); }
.kc { margin: 28px 0; }
.kcrow { display: flex; flex-wrap: wrap; gap: 8px; }
.kcrow .chip { font-size: 14px; padding: 6px 12px; margin: 0; text-decoration: none; }
.kclab { margin: 0 0 10px; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.kg + .kg { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--line); }
.concepts { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.concepts div { background: var(--card); border: 1.5px solid var(--edge); border-radius: 14px; padding: 12px 14px; }
.concepts b { display: block; }
.concepts span { font-size: 14px; color: var(--muted); }
summary { cursor: pointer; }

/* lesson layout */
.lesson { display: grid; grid-template-columns: 280px 1fr; gap: 36px; align-items: start; }
.lmain { min-width: 0; }
.dd { position: relative; margin-bottom: 12px; border: 1.5px solid var(--edge); border-radius: 16px; background: var(--card); }
.dd summary { list-style: none; display: flex; align-items: center; gap: 10px; padding: 12px 14px; }
.dd summary::-webkit-details-marker { display: none; }
.lsum { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.lsum small, .lopt small { font-size: 12px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--brand); }
.lsum span, .lopt span { font-weight: 500; line-height: 1.35; }
.chev { transition: transform .15s; color: var(--muted); }
.dd[open] .chev { transform: rotate(90deg); }
.ddmenu { position: absolute; z-index: 6; left: 0; right: 0; top: calc(100% + 6px); background: var(--card); border: 1.5px solid var(--edge); border-radius: 14px; box-shadow: var(--lift); padding: 6px; max-height: 65vh; overflow: auto; }
.lopt { display: flex; flex-direction: column; gap: 2px; padding: 10px 12px; border-radius: 10px; text-decoration: none; }
.lopt:hover, .lopt.on { background: var(--leaf); }
.sitem { display: flex; gap: 10px; align-items: flex-start; padding: 10px 8px; margin: 2px 0; border-radius: 10px; text-decoration: none; font-size: 14px; color: var(--muted); }
.sitem:hover { background: var(--soft); }
.sitem.on { background: var(--leaf); color: var(--ink); font-weight: 500; box-shadow: inset 3px 0 0 var(--brand); }
.sitem.sknow { background: var(--soft); }
.sdot { flex: none; width: 24px; height: 24px; border-radius: 8px; display: grid; place-items: center; font-size: 12px; font-weight: 600; border: 2px solid var(--edge); color: var(--ink); }
.sitem.on .sdot { background: var(--brand); border-color: var(--brand); color: #fff; }
.sdot.done { background: var(--ok); border-color: var(--ok); color: #fff; }
.ptag { display: inline-block; font-size: 12px; font-weight: 800; color: #fff; border-radius: 8px; padding: 3px 10px; margin-bottom: 8px; }
.ahead h1 { margin: 0 0 6px; }
.ameta { color: var(--muted); font-size: 14px; margin-bottom: 22px; }
.steps { padding-left: 22px; }
.steps li { margin: 10px 0; font-size: 17px; }
.note { width: 100%; min-height: 140px; padding: 12px; border-radius: 14px; border: 1px solid var(--line); background: var(--card); color: var(--ink); font: inherit; }
.donebox { display: flex; gap: 8px; align-items: center; margin-top: 28px; font-weight: 600; }
.code { border: 1.5px solid var(--edge); border-radius: 14px; overflow: hidden; background: var(--card); }
.codebar { display: flex; justify-content: space-between; align-items: center; padding: 8px 12px; background: var(--soft); font-size: 13px; font-weight: 700; color: var(--muted); }
.copy { font: inherit; font-size: 13px; border: 1px solid var(--edge); background: var(--card); color: var(--ink); border-radius: 8px; padding: 3px 10px; cursor: pointer; }
.code pre { margin: 0; padding: 14px 16px; white-space: pre-wrap; font: inherit; font-size: 15px; line-height: 1.7; }
.story { max-width: 720px; margin: 28px 0 8px; font-size: 18px; line-height: 1.8; }
.story p { margin: 0 0 20px; }
.story p:first-child::first-letter { font-family: Lora, serif; font-size: 2.6em; font-weight: 700; float: left; line-height: 1; margin: 4px 8px 0 0; color: var(--brand); }
.kt { display: flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.kmem { background: var(--soft); border: 1.5px dashed var(--gold); border-radius: 16px; padding: 18px; }
.kmem ul { margin: 8px 0 0; padding-left: 20px; line-height: 1.7; font-weight: 600; }
.recap { margin: 8px 0 0; }
.rk { display: block; text-decoration: none; padding: 12px 0; border-bottom: 1px solid var(--edge); }
.rk:last-child { border: 0; }
.rk ul { font-weight: 500; margin-top: 4px; }
.know { background: var(--leaf); border: 1.5px solid var(--edge); border-left: 8px solid var(--brand); border-radius: 24px; padding: 32px; box-shadow: var(--lift); }
.klab { font-size: 13px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--brand); }
.know h1 { margin: 4px 0 16px; font-size: clamp(26px, 4vw, 38px); }
.kdef { font-size: 20px; line-height: 1.6; font-weight: 500; margin: 0 0 24px; }
.krow { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.kbox { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px; }
.kbox p { margin: 6px 0 0; line-height: 1.65; }
.deep { margin-top: 20px; }
.deep p { margin: 8px 0 12px; }
.dgrade { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; flex-wrap: wrap; }
.dgrade select { font: inherit; padding: 6px 10px; border-radius: 10px; border: 1px solid var(--edge); background: var(--bg); color: var(--ink); }
.dprompt { white-space: pre-wrap; font: inherit; font-size: 14px; background: var(--soft); border-radius: 12px; padding: 12px 14px; margin: 12px 0 0; }
.prep { display: grid; gap: 10px; }

/* games */
.game { background: var(--card); border: 1.5px solid var(--edge); border-radius: 20px; padding: 28px; box-shadow: var(--lift); }
.gintro { margin: 0 0 22px; color: var(--muted); line-height: 1.7; }
.ghead { display: flex; flex-wrap: wrap; gap: 8px 12px; align-items: baseline; margin-bottom: 10px; }
.ghead .muted { font-size: 13px; }
.gdeck { display: flex; flex-wrap: wrap; gap: 8px; min-height: 56px; padding: 10px; border-radius: 14px; background: var(--soft); }
.gbuckets { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 12px; }
.gbucket { min-height: 160px; border: 2px dashed var(--c); border-radius: 16px; padding: 10px; display: flex; flex-direction: column; gap: 8px; cursor: pointer; }
.gbucket.over, .gdeck.over { background: color-mix(in srgb, var(--c, var(--brand)) 12%, transparent); }
.glabel { font-weight: 800; color: var(--c); }
.gcard { background: var(--card); border: 2px solid var(--line); border-radius: 12px; padding: 8px 10px; cursor: grab; user-select: none; font-size: 14px; }
.gcard.picked { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 30%, transparent); }
.gcard.ok { border-color: var(--ok); } .gcard.bad { border-color: var(--bad); }
.gtop { display: flex; gap: 6px; align-items: center; } .ge { font-size: 20px; } .gv { margin-left: auto; font-weight: 800; }
.gcard.ok .gv { color: var(--ok); } .gcard.bad .gv { color: var(--bad); }
.gwhy { width: 100%; margin-top: 6px; padding: 6px 8px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); font: inherit; font-size: 13px; }
.gexp { margin-top: 6px; font-size: 13px; color: var(--muted); }
.gbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
.gscore { font-size: 17px; } .gtake { margin-top: 12px; }
.gqq { font-weight: 600; margin-bottom: 8px; }
.gqq.big { font-size: 21px; line-height: 1.45; margin-bottom: 20px; }
.gopts { display: flex; flex-wrap: wrap; gap: 8px; }
.gopts.col { flex-direction: column; gap: 12px; }
.gopt, .gm { font: inherit; font-size: 14px; text-align: left; padding: 8px 12px; border-radius: 12px; border: 2px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; }
.gopts.col .gopt { display: flex; align-items: center; gap: 14px; padding: 14px 16px; font-size: 16px; width: 100%; }
.gopt:hover:not([disabled]), .gm:hover:not([disabled]) { border-color: var(--brand); }
.gopt.picked, .gm.picked { border-color: var(--brand); background: var(--leaf); }
.gopt.ok, .gm.ok, .gorder li.ok { border-color: var(--ok); background: color-mix(in srgb, var(--ok) 12%, var(--card)); }
.gopt.bad, .gm.bad, .gorder li.bad { border-color: var(--bad); background: color-mix(in srgb, var(--bad) 12%, var(--card)); }
.gopt.dim, .gm.dim { opacity: .45; }
.gm small { display: block; color: var(--muted); }
.ol { flex: none; width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; font-weight: 800; font-size: 14px; background: var(--soft); color: var(--brand); }
.gopt.picked .ol { background: var(--brand); color: #fff; }
.gexp.big { font-size: 15px; margin-top: 16px; padding: 12px 14px; border-radius: 12px; background: var(--soft); color: var(--ink); }
.qstep { font-size: 13px; font-weight: 700; color: var(--muted); letter-spacing: .06em; text-transform: uppercase; }
.qprog { display: flex; gap: 6px; margin: 10px 0 22px; }
.qprog span { flex: 1; height: 6px; border-radius: 9px; background: var(--line); }
.qprog .on { background: var(--gold); } .qprog .ok { background: var(--ok); } .qprog .bad { background: var(--bad); }
.qnav { justify-content: space-between; margin-top: 24px; }
.gorder { list-style: decimal; padding-left: 24px; margin: 0; }
.gorder li { display: flex; justify-content: space-between; gap: 10px; align-items: center; padding: 8px 10px; margin: 6px 0; border: 2px solid var(--line); border-radius: 12px; background: var(--card); }
.gmv { display: flex; gap: 4px; }
.gmv button { font: inherit; width: 32px; height: 32px; border-radius: 8px; border: 1px solid var(--line); background: var(--soft); color: var(--ink); cursor: pointer; }
.gmatch { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.gmatch > div { display: flex; flex-direction: column; gap: 8px; }
.gest { display: flex; flex-direction: column; gap: 6px; margin: 10px 0; } .gest input { width: 100%; }
.gval { font-size: 24px; font-weight: 800; color: var(--brand); }
.gfields { display: grid; gap: 10px; }
.gfields label, .grefl { display: flex; flex-direction: column; gap: 4px; font-weight: 600; font-size: 14px; margin-bottom: 10px; }
.gfields textarea, .grefl textarea { font: inherit; font-weight: 400; padding: 8px 10px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--ink); }
.gout { margin-top: 12px; padding: 12px; border-radius: 12px; background: var(--soft); }
.gout pre { white-space: pre-wrap; margin: 6px 0 0; font: inherit; font-size: 14px; }

@media (max-width: 820px) { .lesson { grid-template-columns: 1fr; gap: 20px; } }
@media (max-width: 640px) {
  .cycle { grid-template-columns: 1fr 1fr; } .hero { padding: 22px; } th { width: 110px; }
  .gbuckets, .gmatch, .krow { grid-template-columns: 1fr; } .gbucket { min-height: 90px; }
  .game { padding: 18px; } .gqq.big { font-size: 19px; } .know { padding: 20px; } .kdef { font-size: 17px; }
  .ctx { display: none; } .top { padding: 12px 16px; }
}