.course-series-intro { display: none; }
.series-timeline { position: relative; padding: 14px 0 24px 52px; }
.series-timeline::before { content: ""; position: absolute; top: 8px; bottom: 0; left: 17px; width: 1px; background: linear-gradient(var(--text) 0 12px, var(--line) 12px 100%); }
.series-node { position: relative; padding: 0 0 70px 28px; }
.series-node::before { content: ""; position: absolute; top: 8px; left: -41px; width: 13px; height: 13px; border: 1px solid var(--text); border-radius: 50%; background: var(--bg); box-shadow: 0 0 0 7px var(--bg); }
.series-index { position: absolute; top: 31px; left: -49px; color: var(--warm); font: 700 10px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; writing-mode: vertical-rl; }
.series-heading { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 26px 30px; align-items: end; isolation: isolate; overflow: hidden; padding: 30px 0 20px; border-bottom: 1px solid var(--text); }
.series-heading > :not(.series-orbit-art) { position: relative; z-index: 1; }
.series-orbit-art { position: absolute; z-index: -1; top: -186px; right: -82px; width: min(62%, 620px); height: 350px; object-fit: cover; object-position: 66% 40%; opacity: .68; mix-blend-mode: multiply; mask-image: linear-gradient(90deg, transparent 0%, #000 31%, #000 76%, transparent 100%); }
.series-heading h2 { margin: 5px 0 9px; font-family: var(--font-display); font-size: clamp(38px, 4.8vw, 58px); font-weight: 560; letter-spacing: -.05em; line-height: 1.12; text-wrap: balance; }
.series-heading p:not(.eyebrow) { max-width: 760px; color: var(--muted); line-height: 1.7; text-wrap: pretty; }
.series-stats { display: grid; grid-template-columns: auto auto; align-items: baseline; gap: 0 6px; min-width: 150px; }
.series-stats strong { font-family: "Songti SC", STSong, serif; font-size: 46px; font-weight: 500; line-height: 1; }
.series-stats span { color: var(--muted); font-size: 12px; }
.series-stats .text-link { grid-column: 1 / -1; margin-top: 8px; }
.platform-shell .text-link { cursor: pointer; transition: color .18s ease, transform .18s ease; }
.platform-shell .text-link:hover { color: var(--warm); transform: translateX(2px); }
.platform-shell .text-link:active { transform: translate(1px, 1px); }
.series-stage-axis { --stage-progress: 0%; position: relative; grid-column: 1 / -1; margin-top: 8px; padding-top: 18px; border-top: 1px solid var(--line); }
.series-stage-axis::after { position: absolute; top: -1px; left: 0; width: var(--stage-progress); height: 2px; background: var(--neon); box-shadow: 0 0 10px rgba(142, 220, 35, .28); content: ""; transition: width .42s cubic-bezier(.2, .7, .2, 1); }
.series-stage-axis ol { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); margin: 0; padding: 0; list-style: none; }
.series-stage-axis li { min-width: 0; border-left: 1px solid var(--line); }
.series-stage-axis li:first-child { border-left: 0; }
.series-stage-link { position: relative; display: grid; grid-template-columns: 28px minmax(0, 1fr); align-items: start; gap: 8px; min-height: 48px; padding: 2px 12px 3px; color: var(--text); cursor: pointer; transition: color .22s ease, background .22s ease, transform .22s ease; }
.series-stage-link::before { position: absolute; top: -19px; left: 12px; width: 7px; height: 7px; border: 1px solid var(--text); border-radius: 50%; background: var(--bg); content: ""; transition: background .22s ease, border-color .22s ease, box-shadow .22s ease, transform .22s ease; }
.series-stage-link > span { color: var(--warm); font: 700 10px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.series-stage-link b { display: -webkit-box; overflow: hidden; max-height: 2.64em; font-size: 14px; font-weight: 620; line-height: 1.32; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.series-stage-link:hover { color: var(--warm); background: rgba(255, 250, 241, .72); }
.series-stage-link:hover::before { background: var(--text); transform: scale(1.15); }
.series-stage-link.is-active { color: var(--text); background: rgba(255, 250, 241, .84); }
.series-stage-link.is-active::before { border-color: #4a6e16; background: var(--neon); box-shadow: 0 0 0 4px rgba(184, 255, 61, .18), 0 0 12px rgba(142, 220, 35, .45); transform: scale(1.12); }
.series-stage-link.is-active > span { color: #4a6e16; }
.series-stage-link:active { transform: translateY(1px); }
.series-stage-link:focus-visible { z-index: 1; outline-offset: 1px; }
.series-phase { padding: 30px 0 10px; transition: background .32s ease; }
.series-phase { scroll-margin-top: 94px; }
.series-phase:target > header h3 { color: var(--warm); }
.series-phase.is-active > header h3 { color: var(--warm); }
.series-phase > header { display: grid; grid-template-columns: 78px minmax(0, 1fr) auto; align-items: baseline; gap: 12px; margin-bottom: 13px; }
.series-phase > header span, .series-phase > header small { color: var(--warm); font: 700 10px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.series-phase > header h3 { font-size: 17px; font-weight: 620; }
.lesson-card-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.lesson-card { position: relative; min-width: 0; border-top: 1px solid var(--line); padding-top: 8px; }
.lesson-card::before { position: absolute; top: -1px; left: 0; width: 0; height: 1px; background: var(--text); content: ""; transition: width .26s cubic-bezier(.2, .7, .2, 1); }
.lesson-card:focus-within::before, .lesson-card:hover::before { width: 100%; }
.lesson-card-cover { position: relative; display: block; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid rgba(38, 37, 33, .24); border-radius: 3px; background: #ece8de; color: var(--text); cursor: pointer; transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease; }
.lesson-card-cover:hover { border-color: var(--text); box-shadow: 0 7px 16px rgba(54, 45, 31, .12); transform: translateY(-2px); }
.lesson-card-cover:active { transform: translateY(0); }
.lesson-card-cover:focus-visible { outline-offset: 3px; }
.lesson-cover-system { position: relative; display: block; width: 100%; height: 100%; overflow: hidden; isolation: isolate; background-color: #efebe2; background-image: linear-gradient(rgba(34, 35, 32, .055) 1px, transparent 1px), linear-gradient(90deg, rgba(34, 35, 32, .055) 1px, transparent 1px), radial-gradient(circle at 77% 68%, rgba(163, 255, 61, .12), transparent 24%); background-size: 24px 24px, 24px 24px, auto; color: #242521; }
.lesson-cover-system::before { content: ""; position: absolute; z-index: -1; top: -18%; right: 9%; width: 63%; aspect-ratio: 1; border: 1px solid rgba(36, 37, 33, .18); border-radius: 50%; }
.lesson-cover-system::after { content: ""; position: absolute; z-index: -1; left: 7%; right: 7%; top: 62%; height: 1px; background: rgba(36, 37, 33, .2); box-shadow: 0 -74px 0 rgba(36, 37, 33, .08); }
.lesson-cover-orbit { position: absolute; z-index: -1; border: 1px solid rgba(36, 37, 33, .22); border-radius: 50%; }
.lesson-cover-orbit-one { width: 79%; aspect-ratio: 2 / 1; right: -16%; bottom: -11%; transform: rotate(-11deg); border-style: dashed; }
.lesson-cover-orbit-two { width: 31%; aspect-ratio: 1; left: -14%; top: -27%; }
.lesson-cover-dots { position: absolute; right: 8%; top: 10%; color: #74b82a; font: 700 7px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .48em; }
.lesson-cover-meta { position: absolute; top: 11%; left: 8%; display: flex; flex-direction: column; gap: 5px; max-width: 72%; }
.lesson-cover-meta b, .lesson-cover-mark { color: #55584f; font: 700 9px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .12em; }
.lesson-cover-meta i { overflow: hidden; color: rgba(36, 37, 33, .62); font: normal 500 9px/1.2 "PingFang SC", "Microsoft YaHei", sans-serif; letter-spacing: .04em; text-overflow: ellipsis; white-space: nowrap; }
.lesson-cover-title { position: absolute; left: 8%; right: 10%; top: 48%; display: flex; flex-direction: column; gap: .18em; transform: translateY(-50%); font-family: var(--font-display); font-size: clamp(17px, 1.7vw, 24px); font-weight: 600; letter-spacing: -.035em; line-height: 1.18; }
.lesson-cover-title-line { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lesson-cover-mark { position: absolute; right: 8%; bottom: 9%; color: rgba(36, 37, 33, .52); font-size: 7px; }
.lesson-play { position: absolute; right: 9px; bottom: 9px; display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid rgba(36, 37, 33, .18); border-radius: 50%; background: rgba(245, 243, 236, .9); font-size: 9px; }
.lesson-card-copy { display: flex; justify-content: flex-end; min-height: 28px; padding: 8px 1px 0; }
.lesson-card-copy .lesson-state { padding: 0; border: 0; border-radius: 0; background: transparent; font-size: 11px; }
.lesson-code { color: var(--warm); font: 700 10px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.lesson-detail-page { max-width: 1180px; margin: 0 auto; }
.lesson-breadcrumb { display: flex; gap: 9px; align-items: center; padding: 4px 0 16px; color: var(--muted); font-size: 12px; }
.lesson-breadcrumb a { color: inherit; text-decoration: none; cursor: pointer; transition: color .18s ease; }
.lesson-breadcrumb a:hover { color: var(--warm); }
.lesson-detail-hero { min-height: 250px; padding: clamp(26px, 4.5vw, 60px) 0 clamp(30px, 5vw, 68px); border-top: 1px solid var(--text); }
.lesson-detail-kicker { display: flex; gap: 18px; margin-bottom: 36px; color: var(--warm); font: 700 10px/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .1em; text-transform: uppercase; }
.lesson-detail-kicker span:last-child { color: var(--muted); font-family: "PingFang SC", "Microsoft YaHei", sans-serif; font-weight: 500; letter-spacing: .04em; }
.lesson-detail-hero h1 { max-width: 960px; font-family: var(--font-display); font-size: clamp(42px, 5.4vw, 68px); font-weight: 520; letter-spacing: -.055em; line-height: 1.12; }
.lesson-detail-title-line { display: block; white-space: nowrap; }
.lesson-study-layout { display: grid; grid-template-columns: minmax(0, 2.15fr) minmax(260px, .85fr); border-top: 1px solid var(--text); border-bottom: 1px solid var(--line); }
.lesson-primary-player { min-width: 0; padding: 18px 18px 18px 0; border-right: 1px solid var(--line); }
.lesson-video-frame, .lesson-inline-video-frame { position: relative; overflow: hidden; background: #090909; border-radius: 3px; }
.lesson-video-frame video { margin: 0; border-radius: 0; }
.lesson-login-gate { position: absolute; inset: 0; width: 100%; height: 100%; display: grid; place-items: center; border: 0; border-radius: 3px; background: rgba(7, 11, 27, .62); color: #fff; cursor: pointer; }
.lesson-login-gate span { padding: 10px 20px; border: 1px solid currentColor; border-radius: 4px; background: rgba(20, 30, 60, .8); transition: transform .2s ease, background .2s ease; }
.lesson-login-gate:hover span, .lesson-login-gate:focus-visible span { transform: translateY(-2px); background: rgba(55, 73, 130, .9); }
.lesson-login-dialog { max-width: min(420px, calc(100vw - 32px)); padding: 28px; border: 1px solid #61749a; border-radius: 8px; color: #edf2ff; background: #101827; }
.lesson-login-dialog::backdrop { background: rgba(4, 8, 20, .72); }
.lesson-login-dialog-close { float: right; }
.lesson-login-dialog h2 { margin: 16px 0 8px; }
.lesson-login-dialog-actions { display: flex; align-items: center; gap: 12px; margin-top: 22px; }
.lesson-login-dialog-actions a, .lesson-login-dialog-actions button { padding: 9px 14px; border: 1px solid #8296c4; border-radius: 4px; background: #23345f; color: #edf2ff; text-decoration: none; cursor: pointer; }
.lesson-login-dialog-actions a:hover, .lesson-login-dialog-actions button:hover { background: #364e84; }
.lesson-media-missing, .lesson-production-state { display: flex; flex-direction: column; justify-content: center; min-height: 360px; padding: 32px; border-right: 1px solid var(--line); }
.lesson-media-missing h2 { margin: 8px 0; font-size: 24px; }
.lesson-media-missing p:last-child, .lesson-production-state p { color: var(--muted); }
.lesson-production-state > span { margin-bottom: 12px; color: var(--warm); font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: .08em; }
.lesson-article { min-width: 0; padding: 24px 0 28px 28px; }
.lesson-article-heading { padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.lesson-article-heading .eyebrow { margin-bottom: 8px; }
.lesson-article-heading h2 { font-size: 22px; font-weight: 590; }
.lesson-article .prose { margin-top: 20px; min-height: 260px; color: var(--muted); }
.lesson-pagination { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; padding: 12px 0 40px; }
.lesson-pagination a { display: flex; flex-direction: column; gap: 5px; min-height: 86px; padding: 14px; border: 1px solid var(--line); border-radius: 6px; color: inherit; text-decoration: none; cursor: pointer; transition: border-color .18s ease, background .18s ease, transform .18s ease; }
.lesson-pagination a:last-child { text-align: right; }
.lesson-pagination a:hover { border-color: var(--text); background: rgba(255, 250, 241, .68); transform: translateY(-1px); }
.lesson-pagination a:active { transform: translateY(0); }
.lesson-pagination span { color: var(--warm); font-size: 11px; }
.lesson-pagination b { font-size: 14px; font-weight: 560; }
.course-introduction { display: grid; grid-template-columns: minmax(0, 1fr); padding: 26px 0 22px; border-top: 1px solid var(--line); }
.course-lead { max-width: 900px; margin: 0 0 18px; font-family: "Songti SC", STSong, "Noto Serif CJK SC", serif; font-size: clamp(24px, 3.4vw, 42px); font-weight: 600; letter-spacing: -.035em; line-height: 1.3; }
.course-introduction .prose { max-width: 860px; color: var(--muted); }
.course-overview { margin: 12px 0; background: rgba(255, 250, 241, .72); }
.course-overview > .toolbar { align-items: end; margin-bottom: 16px; }
.course-overview .eyebrow { margin-bottom: 4px; }
.course-numbers { display: flex; flex-wrap: wrap; gap: 16px; margin-left: auto; color: var(--muted); font-size: 12px; }
.course-numbers span { display: flex; align-items: baseline; gap: 4px; }
.course-numbers strong { color: var(--text); font-family: "Songti SC", STSong, serif; font-size: 28px; line-height: 1; }
.course-path { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.course-path article { position: relative; min-width: 0; padding: 18px 14px; border-right: 1px solid var(--line); }
.course-path article:last-child { border-right: 0; }
.course-path article > span { display: block; margin-bottom: 20px; color: var(--warm); font-size: 11px; letter-spacing: .12em; }
.course-path h3 { min-height: 45px; font-weight: 560; }
.course-path p { margin-top: 8px; color: var(--muted); font-size: 11px; }
.course-layout { display: grid; grid-template-columns: minmax(0, 1.35fr) minmax(320px, 1fr); gap: 12px; margin: 12px 0; align-items: start; }
.course-player { position: sticky; top: 88px; min-height: 260px; }
.course-player .lesson-code { display: inline-grid; place-items: center; min-width: 38px; height: 28px; border: 1px solid var(--text); color: var(--text); font-size: 11px; font-weight: 700; }
.lesson-state.planned { border-color: #a98f67; color: #785f38; }
.lesson-state.published { border-color: #64816c; color: #3f6849; }
.lesson-section { margin-top: 8px !important; }
.course-directory > .toolbar { margin-bottom: 10px; }
.platform-shell video { display: block; width: 100%; max-height: 60vh; margin-top: 12px; background: #000; border-radius: 6px; }
.lesson-list { display: flex; flex-direction: column; gap: 6px; max-height: 460px; overflow-y: auto; overscroll-behavior: contain; padding: 3px; }
.lesson-group-title { position: sticky; z-index: 1; top: -3px; padding: 9px 4px 6px; color: var(--warm); background: rgba(235, 229, 217, .98); font-size: 12px !important; letter-spacing: .04em; }
.lesson-list button { width: 100%; justify-content: space-between; text-align: left; flex: 0 0 auto; gap: 10px; }
.lesson-list button span { display: grid; grid-template-columns: 38px minmax(0, 1fr); align-items: start; min-width: 0; overflow-wrap: anywhere; }
.lesson-list button span b { color: var(--warm); font-size: 11px; letter-spacing: .04em; }
.lesson-list button small { white-space: nowrap; color: var(--muted); }

@media (max-width: 960px) {
  .lesson-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* Course-only console: Apple's purpose, mapping and immediate-feedback principles adapted for a web admin. */
[data-course-console-installed] { --course-ink: #1d1d1f; --course-secondary: #62656b; --course-blue: #006edb; --course-border: #e4e6ea; max-width: 1120px; margin: 0 auto; color: var(--course-ink); font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
[data-course-console-installed] .page-heading { margin-bottom: 8px; }
[data-course-console-installed] .page-heading h1 { font-size: 27px; font-weight: 690; letter-spacing: -.035em; }
[data-course-console-installed] .admin-tabs { margin-bottom: 12px; }
[data-course-console-installed] .course-console-tabs { display: inline-flex; gap: 2px; margin: 4px 0 16px; padding: 3px; border-radius: 11px; background: #eceef1; }
[data-course-console-installed] .course-console-tabs a { min-height: 36px; padding: 7px 17px; border-radius: 8px; color: var(--course-secondary); text-decoration: none; font-size: 14px; font-weight: 610; white-space: nowrap; transition: background-color .16s ease, color .16s ease, box-shadow .16s ease, transform .1s ease; }
[data-course-console-installed] .course-console-tabs a[aria-current="page"] { background: #fff; color: var(--course-ink); box-shadow: 0 1px 4px rgba(0, 0, 0, .12); }
[data-course-console-installed] .course-console-tabs a:active, [data-course-console-installed] button:active { transform: scale(.97); }
[data-course-console-installed] [data-admin-panel] > .toolbar.panel { min-height: 66px; gap: 9px; margin: 0 0 9px; padding: 10px 16px; border: 1px solid var(--course-border); border-radius: 13px; background: rgba(255, 255, 255, .92); box-shadow: 0 3px 14px rgba(21, 29, 40, .035); }
[data-course-console-installed] [data-admin-panel] > .toolbar.panel h2 { margin-right: auto; font-size: 18px; font-weight: 690; letter-spacing: -.025em; }
[data-course-console-installed] [data-admin-panel] > .toolbar.panel .tag { display: none; }
[data-course-console-installed] .course-series-picker { display: flex; flex: 0 1 340px; align-items: center; gap: 9px; color: var(--course-secondary); font-size: 13px; white-space: nowrap; }
[data-course-console-installed] .course-series-picker select { min-width: 0; flex: 1; }
[data-course-console-installed] .course-quick-publish { display: grid; gap: 17px; padding: 20px; border: 1px solid var(--course-border); border-radius: 15px; background: rgba(255, 255, 255, .95); box-shadow: 0 10px 34px rgba(21, 29, 40, .05); }
[data-course-console-installed] .course-quick-heading h2 { margin: 0; font-size: 21px; letter-spacing: -.025em; }
[data-course-console-installed] .course-quick-heading p { margin: 4px 0 0; color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] .course-quick-pickers { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
[data-course-console-installed] .course-quick-pickers label, [data-course-console-installed] .course-quick-title label, [data-course-console-installed] .course-quick-video > label, [data-course-console-installed] .course-quick-custom { display: grid; gap: 6px; color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] .course-quick-title { display: flex; align-items: end; flex-wrap: wrap; gap: 10px; }
[data-course-console-installed] .course-quick-title label { flex: 1 1 220px; min-width: 0; }
[data-course-console-installed] .course-quick-title input { width: 100%; }
[data-course-console-installed] .course-quick-title button { min-height: 38px; padding: 7px 14px; white-space: nowrap; }
[data-course-console-installed] .course-quick-media { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(250px, .8fr); gap: 18px; }
[data-course-console-installed] .course-quick-video, [data-course-console-installed] .course-quick-cover { display: grid; align-content: start; gap: 10px; min-width: 0; }
[data-course-console-installed] .course-quick-preview, [data-course-console-installed] .course-cover-preview { display: grid; place-items: center; min-height: 170px; overflow: hidden; border: 1px solid var(--course-border); border-radius: 11px; background: #f5f7f9; }
[data-course-console-installed] .course-quick-preview video, [data-course-console-installed] .course-cover-preview img { width: 100%; max-height: 300px; margin: 0; object-fit: contain; border-radius: 0; }
[data-course-console-installed] .course-quick-preview p, [data-course-console-installed] .course-cover-preview p { margin: 10px; color: var(--course-secondary); font-size: 13px; text-align: center; }
[data-course-console-installed] .course-quick-cover fieldset { display: flex; flex-wrap: wrap; gap: 7px 16px; margin: 0; padding: 0; border: 0; }
[data-course-console-installed] .course-quick-cover legend { padding: 0 0 6px; color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] .course-quick-cover fieldset label { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; white-space: nowrap; }
[data-course-console-installed] .course-quick-footer { display: flex; align-items: center; gap: 12px; padding-top: 13px; border-top: 1px solid var(--course-border); }
[data-course-console-installed] .course-quick-footer button { min-width: 116px; min-height: 38px; border-color: var(--course-blue); background: var(--course-blue); color: #fff; font-weight: 680; }
[data-course-console-installed] .course-quick-footer button:disabled { border-color: #d4d8de; background: #e6e9ed; color: #696d74; }
[data-course-console-installed] [data-quick-progress] { color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] [data-quick-progress].error { color: #a13b34; }
[data-course-console-installed] .course-advanced-manager { margin-top: 13px; border: 1px solid var(--course-border); border-radius: 12px; background: rgba(255, 255, 255, .78); }
[data-course-console-installed] .course-advanced-manager > summary { min-height: 48px; padding: 14px 18px; cursor: pointer; font-size: 14px; font-weight: 630; }
[data-course-console-installed] .course-advanced-manager[open] { padding: 0 12px 12px; }
[data-course-console-installed] .course-advanced-manager[open] > summary { margin: 0 -12px 12px; border-bottom: 1px solid var(--course-border); }
[data-course-console-installed] .course-advanced-manager [data-editor-host] { margin-top: 10px; }
[data-course-console-installed] .course-admin-player { display: grid; gap: 8px; padding: 15px; border: 1px solid var(--course-border); border-radius: 13px; background: #fff; }
[data-course-console-installed] .course-admin-player .toolbar { justify-content: space-between; gap: 10px; }
[data-course-console-installed] .course-admin-player h3 { margin: 0; font-size: 16px; }
[data-course-console-installed] .course-admin-player [data-course-playing-title] { color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] .course-admin-player video { width: 100%; max-height: 460px; margin: 0; border-radius: 8px; }
[data-course-console-installed] .course-admin-player p { margin: 0; color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] .course-admin-player [data-course-player-error] { color: #a13b34; }
[data-course-console-installed] .course-quick-publish [hidden], [data-course-console-installed] .course-admin-player [hidden] { display: none !important; }
[data-course-console-installed] .course-search-details { position: relative; flex: 0 0 auto; color: var(--course-secondary); font-size: 13px; }
[data-course-console-installed] .course-search-details summary { padding: 8px 4px; cursor: pointer; }
[data-course-console-installed] .course-search-details label { position: absolute; z-index: 4; top: 38px; right: 0; min-width: 250px; padding: 12px; border: 1px solid var(--course-border); border-radius: 11px; background: #fff; box-shadow: 0 8px 20px rgba(21, 29, 40, .12); }
[data-course-console-installed] .course-search-details input { width: 100%; }
[data-course-console-installed] .admin-content-layout { display: block; }
[data-course-console-installed] .admin-content-list { display: none; }
[data-course-console-installed] [data-editor-host] { min-width: 0; overflow: clip; border: 1px solid var(--course-border); border-radius: 15px; background: rgba(255, 255, 255, .94); box-shadow: 0 10px 34px rgba(21, 29, 40, .05); }
[data-course-console-installed] [data-editor-host] > .empty { margin: 0; border: 0; background: transparent; }
[data-course-console-installed] .course-lesson-media { display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 370px); align-items: center; gap: 10px 20px; margin: 0; padding: 17px 20px 16px; border-bottom: 1px solid var(--course-border); }
[data-course-console-installed] .course-publish-step { display: flex; align-items: center; gap: 12px; }
[data-course-console-installed] .course-publish-step > span { display: grid; flex: 0 0 30px; place-items: center; width: 30px; height: 30px; border-radius: 9px; background: #eef5fe; color: var(--course-blue); font-size: 12px; font-weight: 740; }
[data-course-console-installed] .course-publish-step h3 { margin: 0; font-size: 17px; font-weight: 680; letter-spacing: -.025em; }
[data-course-console-installed] .course-publish-step p { margin: 2px 0 0; color: var(--course-secondary); font-size: 12px; }
[data-course-console-installed] .course-lesson-picker { display: flex; align-items: center; gap: 9px; min-width: 0; color: var(--course-secondary); font-size: 13px; white-space: nowrap; }
[data-course-console-installed] .course-lesson-picker select { min-width: 0; flex: 1; }
[data-course-console-installed] .course-lesson-media .upload-form { grid-column: 1 / -1; display: grid; gap: 8px; margin: 3px 0 0; padding: 0; border: 0; background: transparent; box-shadow: none; }
[data-course-console-installed] .course-lesson-media .upload-form > .toolbar:first-child { align-items: end; }
[data-course-console-installed] .course-lesson-media .upload-form [data-progress-label] { font-size: 12px; }
[data-course-console-installed] .editor-form { margin: 0; padding: 0 20px 20px; border: 0; border-radius: 0; background: transparent; box-shadow: none; }
[data-course-console-installed] .editor-heading { position: sticky; top: 70px; z-index: 2; align-items: center; gap: 8px; margin: 0 -20px 13px; padding: 11px 20px; border-bottom: 1px solid var(--course-border); background: rgba(255, 255, 255, .87); backdrop-filter: blur(18px) saturate(155%); }
[data-course-console-installed] .editor-heading h2 { margin-right: auto; font-size: 17px; font-weight: 680; }
[data-course-console-installed] .editor-heading [data-save-state] { color: var(--course-secondary); font-size: 12px; }
[data-course-console-installed] .editor-heading button[type="submit"] { border-color: var(--course-blue); background: var(--course-blue); color: #fff; font-weight: 650; }
[data-course-console-installed] .editor-heading [data-delete-content] { margin-left: auto; color: #a03931; }
[data-course-console-installed] .editor-form [data-course-fields] { margin-top: 0; }
[data-course-console-installed] .editor-form [data-course-fields] > .toolbar { gap: 8px; margin-bottom: 10px; }
[data-course-console-installed] .editor-form [data-course-fields] > .toolbar h3 { margin-right: auto; font-size: 15px; font-weight: 680; }
[data-course-console-installed] .editor-form [data-course-fields] > .toolbar [data-scaffold] { font-size: 13px; }
[data-course-console-installed] .lesson-edit-layout { display: block; margin: 0; }
[data-course-console-installed] .selected-lesson { min-width: 0; }
[data-course-console-installed] .selected-lesson > .toolbar { margin-bottom: 8px; }
[data-course-console-installed] .selected-lesson > .toolbar h3 { font-size: 13px; font-weight: 650; }
[data-course-console-installed] .selected-lesson > label { margin: 0; }
[data-course-console-installed] .selected-lesson-meta { grid-template-columns: minmax(0, 1.3fr) minmax(190px, .7fr); gap: 12px; }
[data-course-console-installed] .course-lesson-index, [data-course-console-installed] .course-advanced-fields, [data-course-console-installed] .course-lesson-actions, [data-course-console-installed] .course-series-settings { margin: 10px 0 0; border-top: 1px solid var(--course-border); }
[data-course-console-installed] .course-lesson-index summary, [data-course-console-installed] .course-advanced-fields summary, [data-course-console-installed] .course-lesson-actions summary, [data-course-console-installed] .course-series-settings summary { min-height: 38px; padding: 10px 1px; color: var(--course-secondary); cursor: pointer; font-size: 13px; font-weight: 600; }
[data-course-console-installed] .course-lesson-index[open], [data-course-console-installed] .course-advanced-fields[open], [data-course-console-installed] .course-lesson-actions[open], [data-course-console-installed] .course-series-settings[open] { padding-bottom: 10px; }
[data-course-console-installed] .course-lesson-index [data-scaffold] { margin: 0 0 8px; }
[data-course-console-installed] .admin-lesson-list { max-height: 270px; overflow: auto; }
[data-course-console-installed] .course-advanced-fields label { margin: 10px 0; }
[data-course-console-installed] .course-lesson-actions .toolbar { gap: 8px; }
[data-course-console-installed] .course-series-settings .editor-fields { padding: 0 1px 10px; }
[data-course-console-installed] .course-retract { color: #9a3b33; }
[data-course-console-installed] input, [data-course-console-installed] select, [data-course-console-installed] textarea { border-color: #d7dbe0; border-radius: 9px; background: #fff; }
[data-course-console-installed] input:focus-visible, [data-course-console-installed] select:focus-visible, [data-course-console-installed] textarea:focus-visible { border-color: var(--course-blue); outline: 2px solid rgba(0, 110, 219, .18); outline-offset: 1px; }
[data-course-console-installed] button { border-radius: 9px; transition: background-color .16s ease, border-color .16s ease, color .16s ease, transform .1s ease; }
[data-course-console-installed] [data-upload] button[type="submit"] { border-color: #e2e6eb; background: #f1f4f7; color: var(--course-ink); font-weight: 650; }
[data-course-console-installed] .course-admin-overview { display: grid; gap: 14px; }
[data-course-console-installed] .course-admin-overview > .toolbar { margin: 0; }
[data-course-console-installed] .course-admin-overview h2 { margin: 0; }
[data-course-console-installed] .course-admin-overview .toolbar .muted { margin: 0; }
[data-course-console-installed] .course-admin-metrics { margin: 0; }
[data-course-console-installed] .course-view-list { border-top: 1px solid var(--line); }
[data-course-console-installed] .course-view-list > .toolbar { margin: 0; padding: 10px 0; }
[data-course-console-installed] .course-view-list h3 { margin: 0; font-size: 16px; }
[data-course-console-installed] .course-view-lesson { display: flex; justify-content: space-between; gap: 14px; align-items: center; padding: 12px 0; border-top: 1px solid var(--line); }
[data-course-console-installed] .course-view-lesson > div:first-child { display: flex; min-width: 0; align-items: center; gap: 8px; }
[data-course-console-installed] .course-view-lesson b { flex: 0 0 auto; color: var(--warm); font: 700 11px/1 ui-monospace, SFMono-Regular, Menlo, monospace; }
[data-course-console-installed] .course-view-lesson strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
[data-course-console-installed] .course-view-lesson-actions { display: flex; flex: 0 0 auto; align-items: center; gap: 10px; color: var(--muted); font-size: 12px; white-space: nowrap; }
[data-course-console-installed] .course-counting-note { margin: 0; }

@media (max-width: 760px) {
  [data-course-console-installed] [data-admin-panel] > .toolbar.panel { align-items: stretch; }
  [data-course-console-installed] [data-admin-panel] > .toolbar.panel h2 { flex: 1 1 100%; }
  [data-course-console-installed] .course-series-picker { flex: 1 1 100%; }
  [data-course-console-installed] .course-quick-publish { gap: 13px; padding: 14px; }
  [data-course-console-installed] .course-quick-pickers, [data-course-console-installed] .course-quick-media { grid-template-columns: minmax(0, 1fr); }
  [data-course-console-installed] .course-quick-preview, [data-course-console-installed] .course-cover-preview { min-height: 135px; }
  [data-course-console-installed] .course-quick-footer { align-items: flex-start; flex-wrap: wrap; }
  [data-course-console-installed] .course-lesson-media { grid-template-columns: minmax(0, 1fr); padding: 14px; }
  [data-course-console-installed] .editor-form { padding: 0 14px 16px; }
  [data-course-console-installed] .editor-heading { top: 68px; margin: 0 -14px 12px; padding: 10px 14px; }
  [data-course-console-installed] .editor-heading [data-save-state] { order: 4; width: 100%; }
  [data-course-console-installed] .selected-lesson-meta { grid-template-columns: minmax(0, 1fr); }
  [data-course-console-installed] .course-view-lesson { display: grid; grid-template-columns: minmax(0, 1fr); }
  [data-course-console-installed] .course-view-lesson-actions { justify-content: space-between; min-width: 0; }
}

@media (prefers-reduced-motion: reduce) {
  [data-course-console-installed] button, [data-course-console-installed] .course-console-tabs a { transition: none; }
  [data-course-console-installed] button:active, [data-course-console-installed] .course-console-tabs a:active { transform: none; }
}
@media (prefers-reduced-transparency: reduce) {
  [data-course-console-installed] .editor-heading { background: #fff; backdrop-filter: none; }
}

@media (max-width: 760px) {
  .course-layout { grid-template-columns: minmax(0, 1fr); }
  .lesson-list { max-height: 300px; }
  .course-introduction { padding-top: 18px; }
  .course-lead { font-size: 26px; }
  .course-numbers { width: 100%; margin-left: 0; }
  .course-path { grid-template-columns: repeat(5, minmax(190px, 1fr)); overflow-x: auto; scroll-snap-type: x proximity; }
  .course-path article { scroll-snap-align: start; }
  .course-player { position: static; min-height: 210px; }
  .series-heading { grid-template-columns: minmax(0, 1fr); }
  .series-heading { padding-top: 22px; }
  .series-orbit-art { top: -104px; right: -110px; width: 118%; height: 270px; opacity: .35; object-position: 72% 34%; }
  .series-heading h2 { font-size: clamp(26px, 8vw, 34px); letter-spacing: -.075em; }
  .series-timeline { padding-left: 24px; }
  .series-timeline::before { left: 6px; }
  .series-node { padding-left: 14px; }
  .series-node::before { left: -25px; }
  .series-index { display: none; }
  .series-heading { gap: 16px; }
  .series-stats { grid-template-columns: auto 1fr; }
  .series-stage-axis { margin-right: 0; overflow: visible; }
  .series-stage-axis::after { top: 0; bottom: auto; width: 2px; height: var(--stage-progress); }
  .series-stage-axis ol { grid-template-columns: minmax(0, 1fr); width: auto; min-width: 0; padding-right: 0; }
  .series-stage-axis li { border-top: 1px solid var(--line); border-left: 0; }
  .series-stage-axis li:first-child { border-top: 0; }
  .series-stage-link { min-height: 42px; padding: 10px 4px 10px 18px; }
  .series-stage-link::before { top: 50%; left: 0; transform: translateY(-50%); }
  .series-stage-link:hover::before, .series-stage-link.is-active::before { transform: translateY(-50%) scale(1.15); }
  .series-phase > header { grid-template-columns: 64px minmax(0, 1fr) auto; }
  .lesson-card-grid { grid-template-columns: minmax(0, 1fr); }
  .lesson-detail-hero { min-height: 0; padding: 28px 0 34px; }
  .lesson-detail-kicker { flex-direction: column; gap: 6px; margin-bottom: 24px; }
  .lesson-detail-hero h1 { font-size: clamp(26px, 8.5vw, 38px); }
  .lesson-study-layout { grid-template-columns: minmax(0, 1fr); }
  .lesson-primary-player { padding: 12px 0 18px; border-right: 0; }
  .lesson-media-missing, .lesson-production-state { min-height: 210px; border-right: 0; border-bottom: 1px solid var(--line); }
  .lesson-article { padding: 24px 0 28px; }
  .lesson-pagination { grid-template-columns: minmax(0, 1fr); }
}