/* PromptBen 3 · shared LmB tokens, normal document flow, no overlay navigation. */
:root { color-scheme: dark; --pb-border: color-mix(in srgb, var(--lmb-text-muted) 20%, transparent); --pb-soft: color-mix(in srgb, var(--lmb-primary) 12%, var(--lmb-bg-dark)); --pb-success: color-mix(in srgb, var(--lmb-secondary) 65%, var(--lmb-text-main)); --pb-warning: #fbbf83; --pb-radius: 20px; }
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: 150px; }
body { margin: 0; background: var(--lmb-bg-dark); color: var(--lmb-text-main); font-family: Outfit, system-ui, sans-serif; line-height: 1.6; min-width: 320px; }
button, input, textarea, select { font: inherit; }
a { color: inherit; text-decoration: none; }
button, a, input, textarea, select { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
button { color: inherit; }
button:disabled { cursor: default; opacity: .65; }
:focus-visible { outline: 3px solid var(--pb-warning); outline-offset: 4px; }
h1,h2,h3,p { margin: 0; }
h1 { font-size: clamp(1.9rem, 4.6vw, 3.4rem); line-height: 1.12; letter-spacing: -.045em; font-weight: 800; }
h2 { font-size: clamp(1.3rem, 2.4vw, 1.65rem); line-height: 1.3; letter-spacing: -.025em; }
h3 { font-size: 1.1rem; line-height: 1.35; }
p + p { margin-top: 12px; }
code,pre { font-family: ui-monospace, Consolas, monospace; font-size: .87em; }
code { overflow-wrap: anywhere; }
pre { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; padding: 18px; border-radius: 12px; background: var(--lmb-bg-dark); line-height: 1.65; }
ul { padding-left: 22px; }
.wrap { width: min(1160px, calc(100% - 48px)); margin-inline: auto; }
.skip-link { position: absolute; top: -100px; left: 16px; z-index: 10000; padding: 12px; background: var(--lmb-bg-surface); }
.skip-link:focus { top: 8px; }
.app-header { position: sticky; top: 0; z-index: 25; border-bottom: 1px solid var(--pb-border); background: color-mix(in srgb, var(--lmb-bg-dark) 94%, transparent); backdrop-filter: blur(18px); }
.header-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-block: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 800; letter-spacing: -.04em; line-height: 1.1; }
.brand img { object-fit: contain; }
.brand-accent { color: color-mix(in srgb, var(--lmb-primary) 65%, var(--lmb-text-main)); }
.brand small { display: block; font-size: .68rem; font-weight: 400; letter-spacing: .02em; color: var(--lmb-text-muted); margin-top: 5px; }
.header-actions { display: flex; gap: 10px; align-items: center; }
.local-tag,.eyebrow { color: var(--lmb-text-muted); font-size: .75rem; letter-spacing: .11em; font-weight: 600; text-transform: uppercase; }
.main-nav { display: flex; gap: 24px; }
.main-nav a { min-height: 48px; display: flex; align-items: center; gap: 8px; border-bottom: 3px solid transparent; color: var(--lmb-text-muted); font-size: .94rem; }
.main-nav a span { font-size: .68rem; opacity: .7; }
.main-nav a[aria-current=page] { color: var(--lmb-text-main); border-bottom-color: var(--lmb-primary); }
.button { display: inline-flex; justify-content: center; align-items: center; gap: 8px; min-height: 46px; padding: 10px 19px; border: 1px solid transparent; border-radius: var(--lmb-radius-full); background: var(--lmb-grad-primary); color: var(--lmb-text-main); font-weight: 600; font-size: .93rem; line-height: 1.3; text-align: center; }
.button:hover { filter: brightness(1.12); }
.button.secondary { background: var(--lmb-bg-surface); border-color: var(--pb-border); }
.button.ghost { background: transparent; border-color: var(--pb-border); }
.button.compact { min-height: 44px; padding: 8px 14px; font-size: .85rem; }
.button.icon-button { background: transparent; border-color: var(--pb-border); width: 44px; padding: 8px; font-size: 1.1rem; }
.count { padding: 1px 7px; border-radius: 20px; font-size: .7rem; background: var(--pb-soft); }
#main { padding-block: 30px 56px; min-height: 65vh; }
.page-head { display: flex; justify-content: space-between; align-items: start; gap: 20px; margin-bottom: 28px; }
.page-head h1 { font-size: clamp(1.8rem,3.5vw,2.65rem); }
.page-head p,.lead { max-width: 620px; color: var(--lmb-text-muted); margin-top: 12px; }
.eyebrow { display: block; margin-bottom: 10px; color: color-mix(in srgb, var(--lmb-primary) 55%, var(--lmb-text-main)); }
.hero { position: relative; display: grid; grid-template-columns: 1fr 220px; gap: 24px; align-items: center; padding: 36px 40px; border: 1px solid var(--pb-border); border-radius: var(--lmb-radius-lg); background: radial-gradient(ellipse at 90% 40%, color-mix(in srgb, var(--lmb-primary) 17%, transparent), transparent 65%), var(--lmb-bg-surface); margin-bottom: 26px; overflow: hidden; }
.hero h1 em { font-style: normal; color: color-mix(in srgb, var(--lmb-primary) 55%, var(--lmb-text-main)); }
.hero p { max-width: 550px; color: var(--lmb-text-muted); margin-block: 16px 22px; }
.hero img { width: 210px; height: 220px; object-fit: contain; align-self: end; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 10px; }
.section-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin: 30px 0 16px; }
.text-link { color: color-mix(in srgb, var(--lmb-primary) 50%, var(--lmb-text-main)); text-decoration: underline; text-underline-offset: 4px; }
.grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 16px; }
.grid.two { grid-template-columns: repeat(2,minmax(0,1fr)); }
.card { border: 1px solid var(--pb-border); border-radius: var(--pb-radius); padding: 22px; background: var(--lmb-bg-surface); min-width: 0; }
a.card,button.card { text-align: left; display: flex; flex-direction: column; gap: 14px; }
a.card:hover,button.card:hover { border-color: color-mix(in srgb, var(--lmb-primary) 65%, transparent); background: var(--lmb-bg-surface-hover); transform: translateY(-2px); }
.card .card-end { margin-top: auto; display: flex; justify-content: space-between; align-items: center; padding-top: 6px; font-size: .8rem; color: var(--lmb-text-muted); }
.card p { color: var(--lmb-text-muted); font-size: .93rem; }
.card-icon { width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center; background: var(--pb-soft); color: color-mix(in srgb,var(--lmb-primary) 50%,var(--lmb-text-main)); font-weight: 700; font-size: 1rem; }
.tag { display: inline-flex; align-items: center; padding: 3px 9px; border-radius: 20px; border: 1px solid var(--pb-border); font-size: .72rem; line-height: 1.5; color: var(--lmb-text-muted); }
.tag.success { color: var(--pb-success); }
.muted { color: var(--lmb-text-muted); }
.small { font-size: .83rem; }
.progress-line { display: flex; align-items: center; justify-content: space-between; gap: 16px; font-size: .85rem; margin-block: 16px; }
progress { accent-color: var(--lmb-primary); height: 7px; width: 130px; max-width: 100%; border: 0; border-radius: 20px; overflow: hidden; background: var(--lmb-bg-surface-hover); }
progress::-webkit-progress-bar { background: var(--lmb-bg-surface-hover); }
progress::-webkit-progress-value { background: var(--lmb-grad-primary); }
.shelf { display: flex; flex-wrap: wrap; gap: 9px; }
.pill { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 8px 14px; border: 1px solid var(--pb-border); border-radius: 50px; background: transparent; color: var(--lmb-text-muted); font-size: .87rem; }
.pill[aria-pressed=true],.pill.active { background: var(--pb-soft); color: var(--lmb-text-main); border-color: var(--lmb-primary); }
.search { display: flex; align-items: end; gap: 14px; flex-wrap: wrap; margin-block: 18px; }
.search label { flex: 1; min-width: 180px; }
label.field { display: flex; flex-direction: column; gap: 7px; font-size: .9rem; margin-bottom: 16px; }
input:not([type=checkbox]):not([type=radio]):not([type=file]),textarea,select { width: 100%; color: var(--lmb-text-main); background: var(--lmb-bg-dark); border: 1px solid var(--pb-border); border-radius: 10px; padding: 12px 14px; min-height: 46px; }
textarea { resize: vertical; line-height: 1.6; min-height: 105px; }
input::placeholder,textarea::placeholder { color: var(--lmb-text-muted); opacity: .7; }
input[type=checkbox],input[type=radio] { width: 20px; height: 20px; flex-shrink: 0; accent-color: var(--lmb-primary); }
.check { display: flex; gap: 10px; align-items: start; margin-block: 12px; font-size: .9rem; }
.check span small { display: block; color: var(--lmb-text-muted); }
.work-layout { display: grid; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 24px; align-items: start; margin-top: 24px; }
.work-layout > * { min-width: 0; }
.output-pane { position: sticky; top: 145px; }
.output-pane textarea { min-height: 330px; font-family: ui-monospace,Consolas,monospace; font-size: .83rem; }
.output-pane .actions { margin-top: 14px; }
.output-pane select { margin-top: 10px; }
.output-note { font-size: .8rem; color: var(--lmb-text-muted); margin-top: 12px; }
.callout { border-left: 3px solid var(--lmb-primary); padding: 12px 18px; background: var(--pb-soft); border-radius: 0 10px 10px 0; margin-block: 18px; font-size: .92rem; }
.callout.success { border-left-color: var(--pb-success); }
.ben-note { display: flex; align-items: center; gap: 18px; margin-block: 20px; }
.ben-note img { width: 80px; height: 85px; object-fit: contain; flex-shrink: 0; }
.ben-note p { color: var(--lmb-text-muted); font-size: .9rem; }
.lesson { max-width: 800px; margin-inline: auto; }
.lesson-copy { display: grid; gap: 22px; }
.lesson-copy p { color: var(--lmb-text-muted); margin-top: 10px; }
.back { display: inline-flex; align-items: center; min-height: 44px; gap: 8px; font-size: .85rem; color: var(--lmb-text-muted); margin-bottom: 14px; }
.question { margin-top: 22px; }
.question h2 { margin-bottom: 18px; }
.options { display: grid; gap: 10px; }
.option { width: 100%; display: flex; align-items: start; gap: 12px; text-align: left; border: 1px solid var(--pb-border); border-radius: 12px; padding: 14px; min-height: 50px; background: var(--lmb-bg-dark); font-size: .95rem; line-height: 1.5; }
.option:not(:disabled):hover { border-color: var(--lmb-primary); }
.option .letter { display: grid; place-items: center; width: 26px; height: 26px; flex-shrink: 0; border-radius: 7px; border: 1px solid var(--pb-border); font-size: .75rem; }
.option.correct { border-color: var(--pb-success); }
.option.wrong { border-color: var(--pb-warning); }
.option:disabled { opacity: 1; }
.feedback { margin-top: 16px; padding: 16px; border-radius: 12px; background: var(--pb-soft); }
.feedback strong { display: block; margin-bottom: 5px; color: var(--pb-success); }
.feedback.retry strong { color: var(--pb-warning); }
.feedback p { font-size: .9rem; }
.quiz-shell { max-width: 760px; margin-inline: auto; }
.quiz-shell .ben-note { margin-block: 8px 18px; }
.quiz-shell h1 { font-size: clamp(1.55rem, 3vw, 2.15rem); }
.quiz-shell .card { padding: 24px; }
.material { margin-top: 16px; padding: 16px; background: var(--lmb-bg-dark); border-radius: 12px; font-size: .92rem; white-space: pre-wrap; }
.lab-pane { min-height: 230px; }
.lab-pane h2 { font-size: 1.3rem; }
.lab-pane h3 { font-size: 1.1rem; }
.lab-pane p { margin-block: 8px; }
.lab-pane ul { margin-block: 8px; }
.lab-input { min-height: 230px; font-family: ui-monospace, Consolas,monospace; font-size: .9rem; }
.live-result { margin-top: 12px; }
iframe.demo { background: var(--lmb-bg-surface); width: 100%; height: 235px; border: 1px solid var(--pb-border); border-radius: 12px; }
.empty { padding: 36px 20px; text-align: center; max-width: 640px; margin: auto; }
.empty img { width: 120px; height: 120px; object-fit: contain; }
.empty p { margin-block: 12px 20px; color: var(--lmb-text-muted); }
dialog { color: var(--lmb-text-main); background: var(--lmb-bg-surface); border: 1px solid var(--pb-border); border-radius: 22px; width: min(720px,calc(100% - 24px)); padding: 26px; max-height: calc(100dvh - 36px); overflow-y: auto; }
dialog::backdrop { background: color-mix(in srgb,var(--lmb-bg-dark) 80%,transparent); backdrop-filter: blur(4px); }
.dialog-head { display: flex; justify-content: space-between; align-items: start; gap: 16px; margin-bottom: 18px; }
.dialog-head h2 { margin-top: 8px; }
.provider-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; margin-block: 20px; }
.provider-choice { border: 1px solid var(--pb-border); padding: 12px; border-radius: 12px; margin: 0; }
.provider-choice:has(input:checked) { background: var(--pb-soft); border-color: var(--lmb-primary); }
.separator { border: 0; border-top: 1px solid var(--pb-border); margin-block: 24px; }
.notice { padding: 16px; margin-block: 18px; background: var(--pb-soft); border: 1px solid var(--pb-border); border-radius: 12px; font-size: .88rem; }
.teaching-bar { padding: 12px 24px; text-align: center; background: var(--pb-soft); font-size: .85rem; }
.teaching-bar a { text-decoration: underline; margin-left: 12px; }
.toast { position: fixed; z-index: 10000; bottom: 24px; left: 50%; transform: translateX(-50%); max-width: calc(100% - 32px); background: var(--lmb-bg-surface-hover); border: 1px solid var(--pb-border); color: var(--lmb-text-main); border-radius: 12px; padding: 13px 20px; font-size: .9rem; box-shadow: var(--lmb-shadow-glow); }
.license-load-notice { position: fixed; inset: 0; z-index: 11000; display: flex; align-items: center; justify-content: center; gap: 16px; flex-direction: column; background: var(--lmb-bg-dark); padding: 40px; text-align: center; }
.license-load-notice button { padding: 14px 24px; border-radius: 50px; }
.lmb-footer { margin-top: 0; }
.lmb-footer-inner { max-width: 1160px; gap: 20px; }
.lmb-footer-links { flex-wrap: wrap; justify-content: center; gap: 18px; }
.lmb-footer-links button { border: 0; background: transparent; color: var(--lmb-text-muted); font: inherit; font-size: .85rem; padding: 10px 0; min-height: 44px; }
.lmb-footer .lmb-footer-badge { position: static; max-width: 100%; margin: 0; transform: none; }
.lmb-footer .lmb-footer-tip { max-width: 280px; opacity: 1; white-space: normal; }
.boot { display: grid; justify-items: center; gap: 12px; padding: 80px 0; }
.details { border-top: 1px solid var(--pb-border); padding-block: 16px; }
.details summary { min-height: 44px; display: list-item; align-content: center; }
.details p { color: var(--lmb-text-muted); font-size: .9rem; }
.source-list li { margin-block: 12px; }
.source-list a { text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2,minmax(0,1fr)); } .hero { padding: 30px; grid-template-columns: 1fr 170px; } .hero img { width: 170px; height: 190px; } .local-tag { display: none; } }
@media (max-width: 700px) { .work-layout { grid-template-columns: 1fr; } .output-pane { position: static; } .grid.two { grid-template-columns: 1fr; } .hero { grid-template-columns: 1fr 110px; padding: 24px; gap: 0; } .hero h1 { font-size: 2rem; } .hero img { width: 125px; height: 150px; margin-right: -18px; } .hero p,.hero .actions { grid-column: 1 / -1; } .hero-copy { display: contents; } .hero .eyebrow { grid-column: 1 / -1; } .hero h1 { grid-column: 1; } .hero img { grid-column: 2; grid-row: 2; } .hero p { margin-block: 16px 20px; } .main-nav { justify-content: space-between; gap: 4px; } .main-nav a { font-size: .85rem; } .main-nav a span { display: none; } .page-head { flex-direction: column; gap: 12px; } }
@media (max-width: 480px) { .wrap { width: calc(100% - 32px); } .header-top { padding-block: 12px; } .brand { font-size: 1.15rem; gap: 6px; } .brand img { width: 32px; height: 32px; } .brand small { font-size: .6rem; } .header-actions { gap: 5px; } .header-actions .button.compact { padding-inline: 10px; font-size: .78rem; } .count { display: none; } #main { padding-top: 20px; } .hero { border-radius: 18px; padding: 22px; } .grid { grid-template-columns: 1fr; gap: 12px; } .card { padding: 20px; } .provider-grid { grid-template-columns: 1fr; } .option { padding: 12px; font-size: .91rem; } .quiz-shell .card { padding: 18px; } .quiz-shell .ben-note img { width: 60px; height: 70px; } input:not([type=checkbox]):not([type=radio]),textarea,select { font-size: 16px; } .output-pane textarea { font-size: 14px; } dialog { padding: 20px; } }
@media (prefers-reduced-motion: no-preference) { .button,.card { transition: transform .16s, border-color .16s, background .16s; } }
@media print { .app-header,.actions,dialog,.toast,#storage-notice,.lmb-footer-badge { display: none !important; } body { background: white; color: black; } .wrap { width: 100%; } .card { break-inside: avoid; border-color: gray; background: transparent; } .muted,.card p,.lesson-copy p { color: black; } }
/* A practice card fits the actual viewport; feedback and the next step stay visible. */
#main.is-quiz { height: calc(100dvh - var(--pb-header-height, 125px)); min-height: 0; padding-block: 12px 16px; display: flex; flex-direction: column; }
.practice { width: 100%; flex: 1; min-height: 0; display: flex; flex-direction: column; }
.practice .progress-line { flex-shrink: 0; margin: 0 0 10px; gap: 8px; }
.practice .back { margin: 0; }
.practice .progress-line progress { width: 88px; }
.practice .quiz-card { flex: 1; min-height: 0; display: flex; flex-direction: column; padding: 0; overflow: hidden; }
.quiz-body { overflow-y: auto; overscroll-behavior: contain; padding: 20px; min-height: 0; flex: 1; }
.quiz-topic { display: flex; gap: 12px; align-items: center; margin-bottom: 8px; }
.quiz-topic img { object-fit: contain; }
.quiz-topic .eyebrow { margin: 0; }
.practice .question { margin: 0; }
.practice .question > .eyebrow { display: none; }
.practice .question h1 { font-size: clamp(1.3rem, 3vw, 1.85rem); line-height: 1.3; letter-spacing: -.025em; margin: 10px 0 18px; }
.quiz-result { padding: 16px 20px; border-top: 1px solid var(--pb-border); background: var(--lmb-bg-surface); flex-shrink: 0; }
.quiz-result .feedback { padding: 0; margin: 0 0 14px; background: transparent; }
.quiz-result .actions { gap: 8px; }
.quiz-hint { padding: 12px 20px; border-top: 1px solid var(--pb-border); flex-shrink: 0; }
a.card .tag,button.card .tag { align-self: flex-start; }
@media(max-width:480px){.quiz-body{padding:16px}.quiz-result{padding:14px 16px}.quiz-result .button{font-size:.85rem;padding-inline:13px}.quiz-result .feedback p{font-size:.85rem}.practice .option{padding:12px}.practice .question h1{margin-bottom:14px}}
@media(max-height:550px){.quiz-result .feedback{max-height:95px;overflow-y:auto}.quiz-topic{display:none}}