@font-face { font-family: CourseSerif; src: url('/art_vendor/fonts/noto-serif-sc-700.woff2') format('woff2'); font-weight: 700; font-display: swap; }
@font-face { font-family: CourseSans; src: url('/art_vendor/fonts/noto-sans-sc-400.woff2') format('woff2'); font-weight: 400; font-display: swap; }
@font-face { font-family: CourseSans; src: url('/art_vendor/fonts/noto-sans-sc-700.woff2') format('woff2'); font-weight: 700; font-display: swap; }
:root { --forest:#071009; --forest-2:#102317; --paper:#f2e6c7; --paper-2:#fff8e8; --ink:#182119; --red:#e6532d; --red-hot:#ff7040; --gold:#b88d47; --line:rgb(242 230 199 / .17); --muted:rgb(242 230 199 / .58); }
* { box-sizing: border-box; }
html { color: var(--paper); background: var(--forest); font-family: CourseSans, sans-serif; scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; min-height: 100vh; background: radial-gradient(circle at 80% 20%, rgb(66 117 75 / .24), transparent 30%), var(--forest); }
button, textarea, input, select { font: inherit; }
button { cursor: pointer; }
h1,h2,h3,p,blockquote,dl,dd { margin: 0; }
.course-app { display: grid; grid-template-columns: 310px minmax(0,1fr); min-height: 100vh; }
.course-rail { position: sticky; top: 0; height: 100vh; overflow: auto; padding: 30px 22px; border-right: 1px solid var(--line); background: rgb(5 13 7 / .86); }
.course-brand { display: flex; justify-content: space-between; align-items: center; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.course-brand strong { font-family: CourseSerif, serif; font-size: 21px; }
.course-brand span { color: var(--red-hot); font-size: 11px; letter-spacing: .12em; }
.learner-card { margin: 24px 0; padding: 16px; border: 1px solid var(--line); background: rgb(242 230 199 / .035); }
.learner-card small { color: var(--gold); }
.learner-card b { display: block; margin-top: 8px; font-family: CourseSerif, serif; font-size: 24px; }
.learner-card p { margin-top: 5px; color: var(--muted); font-size: 13px; line-height: 1.5; }
.course-progress { height: 3px; margin: 18px 0 24px; background: rgb(242 230 199 / .1); }
.course-progress i { display: block; width: var(--progress); height: 100%; background: var(--red-hot); transition: width .35s ease; }
.module-nav { display: grid; gap: 4px; }
.module-button { display: grid; grid-template-columns: 32px 1fr; gap: 10px; width: 100%; padding: 12px 10px; border: 0; color: var(--muted); background: transparent; text-align: left; }
.module-button span { color: var(--gold); font-size: 11px; }
.module-button b { font-size: 14px; line-height: 1.4; }
.module-button.active { color: var(--paper-2); background: rgb(242 230 199 / .07); box-shadow: inset 3px 0 var(--red); }
.module-button.done span { color: var(--red-hot); }
.rail-actions { display: grid; gap: 8px; margin-top: 24px; }
.rail-actions a,.rail-actions button { padding: 11px 12px; border: 1px solid var(--line); color: var(--paper); background: transparent; text-align: center; text-decoration: none; font-size: 12px; }
.course-main { min-width: 0; }
.course-topbar { display: flex; justify-content: space-between; gap: 20px; padding: 22px clamp(24px,5vw,76px); border-bottom: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.course-stage { max-width: 1280px; margin: 0 auto; padding: clamp(48px,7vw,96px) clamp(24px,6vw,88px) 120px; }
.chapter-head { display: grid; grid-template-columns: minmax(0,1fr) 300px; gap: clamp(34px,6vw,88px); align-items: end; padding-bottom: 48px; border-bottom: 1px solid var(--line); }
.chapter-kicker { color: var(--red-hot); font-weight: 700; font-size: 12px; letter-spacing: .16em; }
.chapter-head h1 { max-width: 850px; margin-top: 18px; font-family: CourseSerif, serif; font-size: clamp(50px,7vw,98px); line-height: 1.02; text-wrap: balance; }
.chapter-head blockquote { padding-left: 18px; border-left: 3px solid var(--red); color: var(--paper); font-family: CourseSerif, serif; font-size: 22px; line-height: 1.55; }
.chapter-grid { display: grid; grid-template-columns: minmax(0,1.35fr) minmax(300px,.65fr); gap: clamp(36px,6vw,82px); padding-top: 54px; }
.lesson-copy { display: grid; gap: 28px; }
.lesson-copy h2,.workbench h2 { font-family: CourseSerif, serif; font-size: 34px; }
.lesson-copy p { max-width: 760px; color: rgb(242 230 199 / .75); font-family: CourseSerif, serif; font-size: 20px; line-height: 1.85; }
.contrast-strip { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.contrast-strip div { padding: 22px; }
.contrast-strip div + div { border-left: 1px solid var(--line); }
.contrast-strip small { color: var(--gold); }
.contrast-strip strong { display: block; margin-top: 9px; font-family: CourseSerif, serif; font-size: 24px; }
.probe-list { display: grid; gap: 10px; }
.probe { padding: 16px 18px; border-left: 3px solid var(--red); color: var(--paper); background: rgb(242 230 199 / .045); line-height: 1.6; }
.workbench { align-self: start; padding: 26px; color: var(--ink); background: linear-gradient(145deg,var(--paper),var(--paper-2)); box-shadow: 0 32px 90px rgb(0 0 0 / .3); }
.workbench-label { color: #a2341d; font-size: 11px; font-weight: 700; letter-spacing: .14em; }
.workbench h2 { margin: 10px 0 18px; font-size: 29px; }
.workbench-prompt { color: rgb(24 33 25 / .72); line-height: 1.65; }
.workbench textarea { width: 100%; min-height: 210px; margin-top: 18px; padding: 15px; border: 1px solid rgb(24 33 25 / .2); border-radius: 0; color: var(--ink); background: rgb(255 255 255 / .48); line-height: 1.65; resize: vertical; }
.checklist { display: grid; gap: 9px; margin-top: 18px; }
.checklist label { display: grid; grid-template-columns: 20px 1fr; gap: 9px; align-items: start; font-size: 14px; line-height: 1.45; }
.checklist input { accent-color: var(--red); }
.workbench-actions { display: flex; justify-content: space-between; gap: 12px; margin-top: 22px; }
.course-button { min-height: 46px; padding: 0 18px; border: 0; color: #fff8e8; background: var(--red); font-weight: 700; }
.course-button.secondary { color: var(--ink); background: transparent; border: 1px solid rgb(24 33 25 / .25); }
.chapter-footer { display: flex; justify-content: space-between; gap: 16px; margin-top: 62px; padding-top: 28px; border-top: 1px solid var(--line); }
.chapter-footer button { padding: 13px 0; border: 0; color: var(--paper); background: transparent; font-weight: 700; }
.chapter-footer button:disabled { opacity: .25; }
.artifact-banner { display: grid; grid-template-columns: 120px 1fr; gap: 24px; margin-top: 44px; padding: 26px; border: 1px solid var(--line); background: linear-gradient(110deg,rgb(230 83 45 / .13),transparent 68%); }
.artifact-banner span { color: var(--gold); font-size: 12px; }
.artifact-banner strong { font-family: CourseSerif, serif; font-size: 24px; }
.course-toast { position: fixed; right: 24px; bottom: 24px; z-index: 20; padding: 12px 16px; color: var(--paper-2); background: var(--red); transform: translateY(80px); opacity: 0; transition: .3s ease; }
.course-toast.show { transform: none; opacity: 1; }
.course-enroll { position: fixed; inset: 0; z-index: 50; display: grid; place-items: center; padding: 20px; background: rgb(3 8 4 / .82); backdrop-filter: blur(12px); }
.course-enroll form { width: min(520px,100%); padding: 34px; color: var(--ink); background: var(--paper-2); box-shadow: 0 40px 120px rgb(0 0 0 / .55); }
.course-enroll h2 { margin: 12px 0; font-family: CourseSerif,serif; font-size: 38px; }
.course-enroll p { margin-bottom: 22px; color: rgb(24 33 25 / .68); line-height: 1.65; }
.course-enroll label { display: grid; gap: 7px; margin-top: 14px; font-size: 13px; }
.course-enroll input,.course-enroll select { width: 100%; height: 50px; padding: 0 13px; border: 1px solid rgb(24 33 25 / .22); border-radius: 0; color: var(--ink); background: #fff; }
.course-enroll .course-button { width: 100%; margin-top: 22px; }
.course-enroll small { display: block; margin-top: 12px; color: rgb(24 33 25 / .48); text-align: center; }
@media (max-width: 900px) {
  .course-app { grid-template-columns: 1fr; }
  .course-rail { position: relative; height: auto; padding: 18px; border-right: 0; border-bottom: 1px solid var(--line); }
  .learner-card,.course-progress,.module-nav { display: none; }
  .rail-actions { display: flex; margin-top: 14px; }
  .rail-actions > * { flex: 1; }
  .chapter-head,.chapter-grid { grid-template-columns: 1fr; }
  .chapter-head h1 { font-size: clamp(46px,13vw,72px); }
  .chapter-head blockquote { font-size: 19px; }
  .chapter-grid { padding-top: 38px; }
  .workbench { padding: 22px 18px; }
}
@media (max-width: 560px) {
  .course-topbar { padding: 16px 18px; }
  .course-topbar span:last-child { display: none; }
  .course-stage { padding: 42px 18px 90px; }
  .chapter-head { padding-bottom: 34px; }
  .chapter-head h1 { font-size: 46px; }
  .contrast-strip { grid-template-columns: 1fr; }
  .contrast-strip div + div { border-left: 0; border-top: 1px solid var(--line); }
  .artifact-banner { grid-template-columns: 1fr; gap: 8px; }
}