.course-catalog,.course-unit-page,.course-assessment,.course-footer,.course-finish{--primary:var(--purple);--primary-light:var(--ks1);--surface:var(--ks4);--text:var(--ink);--green:var(--mint);--red:var(--kt37)}
.course-catalog,.course-unit-page{max-width:1180px;margin-inline:auto;min-width:0}
.course-overview{display:grid;grid-template-columns:minmax(0,1fr) minmax(180px,240px);gap:clamp(24px,4vw,56px);background:linear-gradient(120deg,var(--surface),var(--primary-light));margin-bottom:22px}
.course-overview h2{margin:12px 0;font-size:clamp(24px,3vw,34px)}
.course-overview p,.course-catalog-note{color:var(--muted);line-height:1.85;max-width:75ch}
.course-overview-progress{display:flex;flex-direction:column;justify-content:center;gap:12px;align-items:stretch}
.course-overview-progress>strong{font-size:44px;font-variant-numeric:tabular-nums}.course-overview-progress small{font-size:22px;color:var(--muted)}
.course-overview-progress>span,.course-unit-meta{font-size:13px;color:var(--muted)}
.course-method{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.course-method span{padding:8px 12px;border:1px solid var(--line);border-radius:12px;font-size:13px;color:var(--purple)}
.course-stage{margin-block:38px}.course-stage-number{display:inline-grid;place-items:center;width:30px;height:30px;background:var(--primary-light);color:var(--purple);font-size:15px;border-radius:10px}
.course-unit-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.course-unit{display:flex;flex-direction:column;gap:14px;padding:24px;min-width:0}.course-unit h3{font-size:20px;line-height:1.5;text-align:start}.course-unit>p{flex:1;line-height:1.8;color:var(--muted);font-size:14px}.course-unit>.btn{margin-top:4px}
.course-unit-number{font-size:22px;color:var(--purple);font-weight:800}.course-unit-meta{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.course-unit-meta span{display:inline-flex;align-items:center;gap:5px}
.course-unit .progress{height:5px}.course-unit.completed{border-color:var(--green)}.course-unit.locked{opacity:1}.course-unit.locked .course-unit-number{color:var(--muted)}
.course-title{margin-block:25px 32px;max-width:75ch}.course-title h1{font-size:clamp(27px,4vw,40px);line-height:1.4;margin-block:10px;text-align:start}.course-title p{color:var(--muted);line-height:1.8}
.course-reader-layout{display:grid;grid-template-columns:minmax(190px,250px) minmax(0,1fr);align-items:start;gap:28px}
.course-objectives{position:sticky;top:24px;padding:24px}.course-objectives h2{font-size:18px}.course-objectives ul{padding-inline-start:20px;line-height:1.85;font-size:14px;margin-block:14px}.course-objectives li{margin-block:10px}.course-state-line{padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--purple)}
.course-reading{min-width:0;overflow-wrap:anywhere}.course-reading-section{margin-bottom:28px;line-height:1.95;text-align:start}.course-reading-section h2{font-size:23px;line-height:1.5;margin-bottom:14px}.course-reading-section p{margin-block:14px;white-space:pre-line}.course-reading-section ul{padding-inline-start:25px}.course-reading-section li{margin-block:8px}
.course-reading pre,.course-exhibit pre{white-space:pre-wrap;overflow-wrap:anywhere;tab-size:2;padding:18px;border-radius:14px;border:1px solid var(--line);background:var(--bg);text-align:left;line-height:1.75;font-size:13px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;max-width:100%;overflow:auto;unicode-bidi:plaintext}
.course-worked{border-inline-start:4px solid var(--purple);padding:22px;border-radius:18px;background:var(--primary-light)}
.course-sources{padding-block:24px;border-top:1px solid var(--line);font-size:14px}.course-sources h2{font-size:18px}.course-sources ul{list-style:none;padding:0;margin-block:12px;display:grid;gap:12px}.course-sources a{color:var(--purple);text-underline-offset:4px;overflow-wrap:anywhere}.course-sources .icon{display:inline;width:14px}.course-sources p{color:var(--muted);font-size:12px}
.course-start{display:flex;flex-direction:column;gap:16px;margin-block:18px 28px;scroll-margin-bottom:110px}.course-start p{line-height:1.8;color:var(--muted)}.course-lock-message{padding:14px;border-radius:12px;background:var(--primary-light)}.course-all-mastered{display:flex;align-items:center;gap:10px;color:var(--green)!important}
.course-reflection{display:grid;gap:16px}.course-reflection p,.course-reflection li{line-height:1.8}.course-reflection ul{padding-inline-start:24px}.course-reflection summary{cursor:pointer;color:var(--purple)}.course-reflection textarea{width:100%;min-height:180px;resize:vertical;padding:16px;border:1px solid var(--line);border-radius:14px;background:var(--bg);color:var(--ink);font:inherit}
.course-assessment{max-width:1000px}.course-assessment .exercise{max-width:820px;margin-inline:auto;padding-bottom:130px;min-width:0}.course-exercise-title{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:18px;font-size:13px;color:var(--muted)}
.course-theory-panel{border:1px solid var(--line);border-radius:18px;background:var(--surface);margin-bottom:28px;overflow:hidden}.course-theory-panel>summary{padding:16px 20px;cursor:pointer;font-weight:700;color:var(--purple);display:flex;align-items:center;gap:10px;list-style:none}.course-theory-panel>summary:after{content:'+';margin-inline-start:auto}.course-theory-panel[open]>summary:after{content:'−'}.course-theory-panel>.course-reading{padding:clamp(16px,3vw,28px)}
.course-kind{display:block;margin-bottom:10px;font-size:13px;color:var(--purple);text-align:start}.course-assessment .exercise h1{font-size:clamp(22px,3.3vw,30px);line-height:1.65;text-align:start;margin-bottom:18px}
.course-exhibit{margin:16px 0 24px}.course-exhibit figcaption{font-size:12px;color:var(--muted);margin-bottom:8px}.course-exhibit pre{background:var(--surface)}
.course-visual{margin:16px 0 24px;padding:16px;border-radius:14px;border:1px solid var(--line);background:var(--surface);text-align:center}.course-visual figcaption{font-size:12px;color:var(--muted);margin-bottom:10px;text-align:start}.course-visual svg{width:100%;max-width:340px;height:auto}
@keyframes lg-pop{from{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}
@keyframes lg-fade{from{opacity:0}to{opacity:1}}
@keyframes lg-draw{from{stroke-dasharray:400;stroke-dashoffset:400}to{stroke-dasharray:400;stroke-dashoffset:0}}
@keyframes lg-grow-x{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes lg-grow-y{from{transform:scaleY(0)}to{transform:scaleY(1)}}
.lg-anim-pop{transform-box:fill-box;transform-origin:center;animation:lg-pop .4s ease-out backwards}
.lg-anim-fade{animation:lg-fade .5s ease-out backwards}
.lg-anim-draw{animation:lg-draw .6s ease-out forwards}
.lg-anim-grow-x{animation:lg-grow-x .5s ease-out backwards}
.lg-anim-grow-y{animation:lg-grow-y .5s ease-out backwards}
@media(prefers-reduced-motion:reduce){.lg-anim-pop,.lg-anim-fade,.lg-anim-draw,.lg-anim-grow-x,.lg-anim-grow-y{animation:none}}
.course-instruction{font-size:13px;line-height:1.75;color:var(--muted);margin-bottom:16px}
.course-options{display:grid;grid-template-columns:1fr;gap:12px}.course-options .answer-option{width:100%;min-height:68px;text-align:start;justify-content:flex-start;line-height:1.8;font-size:16px;padding:16px 20px;gap:14px}.course-option-mark{display:inline-grid;place-items:center;width:28px;min-width:28px;height:28px;border:1px solid currentColor;border-radius:9px;font-size:13px;align-self:center}
.course-options .course-correct{border-color:var(--green);background:color-mix(in srgb,var(--green) 12%,var(--surface));color:var(--ink);opacity:1}.course-options .course-wrong{border-color:var(--red);background:color-mix(in srgb,var(--red) 10%,var(--surface));opacity:1}.course-options button:disabled{opacity:.8}.course-options button:disabled.selected{opacity:1}
.course-numeric{display:grid;gap:12px;font-weight:700}.course-numeric>span{display:flex;gap:15px;align-items:center;flex-wrap:wrap}.course-numeric input{width:min(220px,100%);border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:15px;padding:16px;font:inherit;font-size:22px}.course-numeric input:focus{border-color:var(--purple);outline:2px solid var(--primary-light)}
.course-sequence ol{list-style:none;padding:0;display:grid;gap:10px}.course-sequence li{display:flex;align-items:center;gap:12px;padding:14px;border:1px solid var(--purple);border-radius:14px;background:var(--primary-light);line-height:1.7}.course-sequence li>span:nth-child(2){flex:1;min-width:0}.course-step-tools{display:flex;flex-shrink:0;gap:4px}.course-step-tools .icon-btn{width:32px;height:36px}.course-step-bank{display:grid;gap:10px;margin-top:20px}.course-step-bank .answer-option{width:100%;text-align:start;line-height:1.7;font-size:15px;gap:12px;min-height:54px}
.course-feedback{margin-top:24px;border:1px solid var(--red);border-inline-start-width:5px;border-radius:18px;background:var(--surface);padding:24px;line-height:1.9;scroll-margin-block:30px 115px}.course-feedback.correct{border-color:var(--green)}.course-feedback h2{font-size:22px;margin-bottom:12px}.course-feedback>strong{display:block;font-size:13px;color:var(--purple)}.course-feedback>p{margin-block:12px}.course-feedback ol,.course-feedback ul{padding-inline-start:24px}.course-placement-card{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:16px;border-inline-start:5px solid var(--purple)}.course-placement-card h2{font-size:18px;margin:6px 0}.course-placement-card p{color:var(--muted);line-height:1.8;margin:0}@media(max-width:620px){.course-placement-card{flex-direction:column;align-items:stretch}}.course-review-card{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px;border-inline-start:5px solid var(--mint)}.course-review-card h2{font-size:19px;margin:6px 0}.course-review-card p{color:var(--muted);line-height:1.8;margin:0}@media(max-width:620px){.course-review-card{flex-direction:column;align-items:stretch}}.course-related{margin-top:26px;padding-top:20px;border-top:1px solid var(--line)}.course-related h2{font-size:15px;margin-bottom:12px}.course-related ul{list-style:none;padding:0;display:grid;gap:10px}.course-related li{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:12px 14px}.course-related li .text-btn{font-size:14px;text-align:start;padding:0}.course-related li small{display:block;color:var(--muted);margin-top:4px;line-height:1.7}.course-misconception{background:color-mix(in srgb,var(--orange) 12%,var(--surface));border-inline-start:3px solid var(--orange);border-radius:10px;padding:12px 14px;margin-block:12px}.course-misconception b{color:var(--orange)}.course-feedback-objective{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:12px;margin-top:15px}.course-feedback small{color:var(--purple);font-weight:700}
.lesson-footer.course-footer{min-height:0;display:flex;flex-wrap:nowrap;justify-content:space-between;padding:16px max(20px,calc((100vw - 820px)/2));gap:14px}.course-footer .btn{min-width:0;margin:0}.course-finish{max-width:820px;margin-inline:auto;min-height:100dvh;justify-content:center}.course-finish h2{font-size:22px;line-height:1.5}.course-finish-icon{display:grid;place-items:center;background:var(--primary-light);border-radius:24px;width:80px;height:80px;color:var(--purple);margin-bottom:20px}.course-finish-icon .icon{width:40px;height:40px}.course-finish-actions{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-block:20px}
@media(max-width:1100px){.course-unit-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.course-reader-layout{grid-template-columns:minmax(0,1fr)}.course-objectives{position:static}.course-objectives ul{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 25px}}
@media(max-width:600px){.course-overview{grid-template-columns:minmax(0,1fr);gap:24px;padding:22px}.course-overview-progress{display:grid;grid-template-columns:auto 1fr;align-items:center;gap:10px 16px}.course-overview-progress>span{font-size:12px}.course-overview-progress .progress,.course-overview-progress .btn{grid-column:1/-1}.course-overview-progress>strong{font-size:34px}.course-unit-grid{grid-template-columns:minmax(0,1fr)}.course-unit{padding:20px}.course-unit h3{font-size:20px}.course-objectives ul{display:block}.course-reading-section{font-size:16px;line-height:1.95}.course-reading-section h2{font-size:21px}.course-worked{padding:16px}.course-assessment .exercise{padding-bottom:125px}.course-options .answer-option{padding:14px;font-size:15px;gap:10px}.course-sequence li{gap:8px;padding:10px;font-size:14px;flex-wrap:wrap}.course-step-tools{margin-inline-start:auto}.lesson-footer.course-footer{padding:12px 16px max(12px,var(--app-safe-bottom,env(safe-area-inset-bottom,0px)));gap:10px}.course-footer .text-btn{font-size:12px;padding:10px 0}.course-footer .btn{font-size:14px;padding:12px 16px}.course-feedback{padding:18px}.course-finish-actions{flex-direction:column;width:100%}.course-finish .finish-stats{width:100%}.course-finish{padding:32px 20px calc(36px + env(safe-area-inset-bottom,0px))}}

/* Progressive hints stay in document flow, never cover the answer controls. */
.course-hints{margin-block:1.25rem;padding:clamp(.8rem,3vw,1.3rem);border:1px solid var(--line);border-radius:18px;background:var(--surface);text-align:start}
.course-hints .between{flex-wrap:wrap;gap:.6rem}.course-hints ol{padding-inline-start:1.5rem;margin-block:.5rem 0}.course-hints li{padding-block:.4rem;line-height:1.8;overflow-wrap:anywhere}.course-hints .text-btn{min-height:44px}.course-assisted-note{border-inline-start:3px solid var(--purple);padding-inline-start:.8rem}