/* Visual Learning: main stylesheet. Design direction "Observatory" (docs/plans/site-redesign.md).
   Order: fonts, tokens, base, layout, header, footer, left nav, buttons, forms, pages, admin tools, small screens. */

/* ---------- fonts (self-hosted, variable) ---------- */
@font-face{font-family:"Inter Variable";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("/fonts/inter-latin-wght-normal.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:"Fraunces Variable";font-style:normal;font-weight:100 900;font-display:swap;
  src:url("/fonts/fraunces-latin-opsz-normal.woff2") format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

/* ---------- tokens: dark ("night") is the default; [data-theme="light"] ("day") is set on <html> by the head script ---------- */
:root{color-scheme:dark;
  --bg:#07090f;--surface:#10141d;--panel:#10141d;--surface-2:#171c28;--line:rgba(255,255,255,.10);
  --ink:#eef1f7;--muted:#9aa5bb;--ink-hi:#fff;
  --accent:#4f6bff;--amber:#f59e0b;--teal:#0d9488;--violet:#7c3aed;--danger:#dc2626;
  /* solid button fills, same in both themes; each carries white text at AA (amber carries dark text) */
  --blue:#3550e6;--btn-violet:#7c3aed;--btn-teal:#0f766e;--btn-danger:#dc2626;
  /* text-safe tints of the accent and status colors */
  --accent-ink:#9fb0ff;--link:#9fb0ff;--tag:#9fb0ff;--tool:#5eead4;--warn-ink:#fbbf24;--err:#fca5a5;--ok:#86efac;
  --nav-ink:#c9d1e3;--nav-bg:#0a0d15;--nav-hover:#171c28;--locked:#7f8aa3;
  --field-bg:#171c28;--field-line:rgba(255,255,255,.36);
  --hover-line:#4f6bff;--hover-bg:#171c28;--pick-on-bg:#1a2140;--pick-bg:#3b2a00;--pick-ink:#fde68a;
  --pill-good-bg:#14532d;--pill-good-ink:#bbf7d0;--pill-warn-bg:#78350f;--pill-warn-ink:#fde68a;
  --pill-none-bg:#2a3142;--pill-none-ink:#cbd5e1;--pill-pub-bg:#1e2f7a;--pill-pub-ink:#c7d2fe;
  /* --shadow is a COLOR (other sheets write "0 8px 30px var(--shadow)"); the ready-made shadows follow */
  --shadow:rgba(0,0,0,.5);
  --shadow-soft:0 1px 2px rgba(0,0,0,.18),0 14px 36px -18px var(--shadow);
  --shadow-lift:0 2px 4px rgba(0,0,0,.2),0 26px 60px -24px var(--shadow);
  --radius:14px;--radius-sm:10px;
  --font-display:"Fraunces Variable",Georgia,"Times New Roman",serif;
  --font-text:"Inter Variable",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --header-h:60px;--gutter:clamp(18px,4vw,48px)}
/* light theme is LOW GLARE (owner 2026-11-08): no white or near-white surface; page and cards stay at or
   below relative luminance 0.75 (site_theme.py checks it) */
:root[data-theme="light"]{color-scheme:light;
  --bg:#dcd8cf;--surface:#e4e0d7;--panel:#e4e0d7;--surface-2:#d3cfc5;--line:rgba(24,28,40,.14);
  --ink:#161a26;--muted:#474f62;--ink-hi:#0b0e16;
  --accent:#3550e6;
  --accent-ink:#2f47d0;--link:#2a41c8;--tag:#2a41c8;--tool:#0b5f58;--warn-ink:#8a4b06;--err:#b42318;--ok:#116b33;
  --nav-ink:#2b3245;--nav-bg:#d6d2c8;--nav-hover:#cac6bb;--locked:#5f677b;
  --field-bg:#d3cfc5;--field-line:rgba(24,28,40,.55);
  --hover-line:#3550e6;--hover-bg:#dedad0;--pick-on-bg:#d3d8f5;--pick-bg:#fdebb5;--pick-ink:#5c2a0b;
  --pill-good-bg:#cfe9d6;--pill-good-ink:#0f3d22;--pill-warn-bg:#fbe6ad;--pill-warn-ink:#5c2a0b;
  --pill-none-bg:#e1ddd2;--pill-none-ink:#2b3245;--pill-pub-bg:#d9e0ff;--pill-pub-ink:#1e3a8a;
  --shadow:rgba(40,34,20,.16)}

/* ---------- base ---------- */
*{box-sizing:border-box}
html{scroll-padding-top:calc(var(--header-h) + 12px);-webkit-text-size-adjust:100%}
html,body{margin:0;background:var(--bg);color:var(--ink)}
body{font-family:var(--font-text);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2{font-family:var(--font-display);font-weight:400;letter-spacing:-.015em;line-height:1.15;color:var(--ink);text-wrap:balance}
h1{font-size:clamp(2rem,3.6vw,2.9rem);margin:.4em 0 .5em}
h2{font-size:clamp(1.45rem,2.4vw,2rem);margin:1.6em 0 .5em}
h3{font-size:1.15rem;font-weight:650;line-height:1.3;margin:1.4em 0 .4em}
p{margin:0 0 1em}
a{color:var(--link);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{color:var(--ink-hi)}
code,kbd,pre,samp{font-family:var(--font-mono);font-size:.92em}
hr{border:0;border-top:1px solid var(--line);margin:28px 0}
::selection{background:var(--accent);color:#fff}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.muted{color:var(--muted)}
.hidden{display:none !important}
.nowrap{white-space:nowrap}
.row{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:650;color:var(--accent-ink);margin:0 0 12px}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none !important;animation:none !important;scroll-behavior:auto !important}}

/* ---------- layout: header on top; optional left nav; main; footer ---------- */
body{display:grid;grid-template-rows:auto 1fr auto;grid-template-columns:minmax(0,1fr);min-height:100vh}
body:has(> aside.nav){grid-template-columns:290px minmax(0,1fr)}
main.main{min-width:0}
/* one centered content column for every page; the footer uses the same width */
body.page main.main{padding:40px var(--gutter) 88px;max-width:1240px;width:100%;margin-inline:auto}
body.page main.main > p,body.page main.main section > p{max-width:75ch}
/* narrow pages: subscribe, account and legal text */
body.page.narrow main.main{max-width:960px}
/* full-height app pages (lesson player, lab) */
body.app{height:100vh;overflow:hidden}
body.app main.main{height:calc(100vh - var(--header-h))}
/* preview of a lesson inside a frame: player only */
body.preview{grid-template-rows:1fr !important;grid-template-columns:1fr !important}
body.preview header.top,body.preview aside.nav{display:none}
body.preview main.main{height:100vh}

/* ---------- header: slim sticky bar; anchors land below it ---------- */
header.top{position:sticky;top:0;z-index:100;grid-column:1/-1;display:flex;align-items:center;gap:26px;
  height:var(--header-h);padding:0 clamp(16px,2.4vw,32px);
  background:var(--bg);border-bottom:1px solid var(--line)}
@supports (backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px)){
  header.top{background:color-mix(in srgb,var(--bg) 90%,transparent);-webkit-backdrop-filter:saturate(1.3) blur(12px);backdrop-filter:saturate(1.3) blur(12px)}
  /* landing page: translucent so the 3D scene shows through */
  body.landing header.top{background:color-mix(in srgb,var(--bg) 58%,transparent)}
}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;font-family:var(--font-display);font-weight:500;font-size:21px;
  letter-spacing:-.01em;line-height:1;color:var(--ink);text-decoration:none;white-space:nowrap}
.brand:hover{color:var(--ink)}
.brand span{color:var(--accent-ink);font-style:italic}
.mark{width:30px;height:30px;flex:none;color:var(--ink)}
.brand .mark{width:30px;height:30px;flex:none}
.mark .mark-play{fill:var(--accent)}
.crumbs{color:var(--muted);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0;flex:0 1 auto}
.crumbs a{color:var(--muted);text-decoration:none}
.crumbs a:hover{color:var(--ink)}
.crumbs span{margin:0 6px;opacity:.6}
@media (max-width:1500px){body.app:has(aside.nav) .crumbs{display:none}}
/* the nav may shrink and scroll sideways instead of widening the page */
.topnav{display:flex;align-items:center;gap:24px;min-width:0;flex:0 1 auto;font-size:15px;font-weight:500;overflow-x:auto;scrollbar-width:none}
.topnav::-webkit-scrollbar{display:none}
.topnav a{color:var(--nav-ink);text-decoration:none;white-space:nowrap;padding:8px 0;border-bottom:2px solid transparent;border-top:2px solid transparent}
.topnav a:hover{color:var(--ink-hi);border-bottom-color:var(--accent)}
.topnav a:focus-visible{outline-offset:-2px}
.topnav a.admin-link{color:var(--warn-ink)}

/* header account area */
.account{margin-left:auto;flex-shrink:0;display:flex;align-items:center;gap:14px;font-size:14px;color:var(--muted)}
.account a,.account span{white-space:nowrap}
.account a{color:var(--nav-ink);text-decoration:none;font-weight:500}
.account a:hover{color:var(--ink-hi)}
.account a[href^="/account/register"]{color:var(--ink-hi);font-weight:650}
.account form{margin:0}
.account button,.account a.btn{padding:8px 14px;font-size:13px}
.account form#viewAs button{background:var(--btn-teal)}
.account form#viewAs button.violet{background:var(--btn-violet)}
/* theme toggle: icon only, no button chrome, right-most in the header. It shows the theme a click
   switches TO: a white sun in the dark theme, a black moon in the light theme */
.account .theme-toggle{display:inline-flex;align-items:center;justify-content:center;padding:4px;margin-left:2px;
  background:none;border:0;border-radius:8px;color:#fff;box-shadow:none;opacity:1}
:root[data-theme="light"] .account .theme-toggle{color:#000}
.account .theme-toggle:hover{background:none;filter:none;opacity:.7}
.account .theme-toggle:active{transform:none}
.account .theme-toggle:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.theme-toggle svg{width:22px;height:22px;flex:none}
.theme-toggle .i-moon{display:none}
:root[data-theme="light"] .theme-toggle .i-moon{display:block}
:root[data-theme="light"] .theme-toggle .i-sun{display:none}
/* notification bell: icon like the theme toggle, with an unread count badge (the dropdown is in bell.css) */
.account .bell{position:relative;display:inline-flex;align-items:center;padding:4px;color:var(--ink);text-decoration:none;border-radius:8px}
.account .bell:hover{opacity:.7}
.account .bell:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.account .bell svg{width:22px;height:22px}
.account .bell-count{position:absolute;top:-4px;right:-6px;min-width:18px;height:18px;padding:0 4px;box-sizing:border-box;
  border-radius:9px;background:var(--blue);color:#fff;font-size:11px;font-weight:700;line-height:18px;text-align:center}

/* ---------- footer: brand, link columns, legal line; same centered column as the pages ---------- */
footer.site{grid-column:1/-1;padding:56px var(--gutter) 32px;background:var(--surface);border-top:1px solid var(--line);font-size:15px}
footer.site .foot-in{max-width:calc(1240px - 2 * var(--gutter));margin:0 auto;display:flex;flex-wrap:wrap;justify-content:space-between;gap:32px 72px}
footer.site .foot-brand{max-width:34ch}
footer.site .foot-name{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:500;font-size:21px;letter-spacing:-.01em;line-height:1;color:var(--ink)}
footer.site .foot-name span{color:var(--accent-ink);font-style:italic}
footer.site p{margin:12px 0 0}
footer.site .foot-links{display:flex;flex-wrap:wrap;gap:28px 72px}
footer.site nav{display:grid;gap:8px;align-content:start;min-width:112px}
footer.site .foot-h{margin:0 0 4px;text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:650;color:var(--muted)}
footer.site a{color:var(--nav-ink);text-decoration:none}
footer.site a:hover{color:var(--ink-hi);text-decoration:underline}
footer.site .foot-legal{max-width:calc(1240px - 2 * var(--gutter));margin:40px auto 0;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 24px;color:var(--muted);font-size:13px}
footer.site .foot-legal p{margin:0}

/* ---------- left nav (lesson, lab and lesson tools) ---------- */
aside.nav{background:var(--nav-bg);border-right:1px solid var(--line);overflow-y:auto;padding:20px 12px 32px;
  height:calc(100vh - var(--header-h));position:sticky;top:var(--header-h)}
.nav-course{display:block;font-family:var(--font-display);font-weight:500;font-size:19px;line-height:1.25;color:var(--ink);text-decoration:none;padding:4px 10px 12px}
.nav-label{text-transform:uppercase;letter-spacing:.14em;font-size:12px;font-weight:650;color:var(--muted);padding:16px 10px 6px}
aside.nav ol,aside.nav ul{list-style:none;margin:0;padding:0}
aside.nav a{display:block;color:var(--nav-ink);text-decoration:none;padding:7px 10px;border-radius:8px;font-size:14px;line-height:1.35}
aside.nav a:not(.btn):hover{background:var(--nav-hover);color:var(--ink-hi)}
aside.nav a:focus-visible{outline-offset:-2px}
.nav-lesson{font-weight:650}
li.open > .nav-lesson{color:var(--ink-hi)}
.nav-sections{margin:2px 0 6px 8px !important;border-left:1px solid var(--line)}
.nav-sections a{padding:6px 10px}
.nav-sections a .num{display:inline-block;min-width:2.4em;color:var(--muted);font-family:var(--font-mono);font-size:12px;font-variant-numeric:tabular-nums}
/* current item: solid accent */
aside.nav .nav-sections a.on,aside.nav .nav-sections a.on:hover{background:var(--blue);color:#fff;font-weight:650}
aside.nav .nav-sections a.on .num{color:#dbe2ff}
aside.nav .nav-labs li.open a,aside.nav .nav-labs li.open a:hover{background:var(--blue);color:#fff;font-weight:650}
.lock{margin-left:6px;font-size:12px;opacity:.8}
aside.nav a.locked{color:var(--locked)}
.nav-cta{margin:20px 6px 0;padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-soft)}
.nav-cta p{margin:0 0 10px;color:var(--muted);font-size:13px;line-height:1.5}
.nav-cta .btn{display:block;text-align:center;margin-top:8px}
aside.nav .nav-cta a.btn{color:#fff;padding:9px 12px}
aside.nav .nav-cta a.btn.amber{color:#111}

/* ---------- buttons: always a solid fill. button and a.btn share one line-height so a link-button and a
   real button with the same padding are the same height. Gray = cancel or disabled, red = danger only ---------- */
button,a.btn,span.btn{border:0;border-radius:var(--radius-sm);padding:11px 18px;font-family:inherit;font-weight:650;font-size:15px;line-height:1.2;
  color:#fff;background:var(--blue);white-space:nowrap;transition:filter .15s ease,transform .15s ease,box-shadow .15s ease}
button{cursor:pointer}
a.btn,span.btn{display:inline-block;box-sizing:border-box;text-decoration:none}
button:hover,a.btn:hover{filter:brightness(1.12)}
a.btn:hover{color:#fff}
button:active,a.btn:active{transform:translateY(1px)}
button:disabled{cursor:default;filter:none;transform:none;opacity:.55}
button.violet,a.btn.violet{background:var(--btn-violet)}
button.teal,a.btn.teal{background:var(--btn-teal)}
button.amber,a.btn.amber,span.btn.amber{background:var(--amber);color:#111}
button.amber:hover,a.btn.amber:hover{color:#111}
button.green{background:#15803d}
button.danger,a.btn.danger{background:var(--btn-danger)}
button.gray,a.btn.gray,button.off{background:#4b5563}
.big{font-size:18px !important;padding:15px 30px !important;border-radius:12px}

/* ---------- forms ---------- */
.form{max-width:440px;display:grid;gap:16px}
.form label{display:grid;gap:6px;font-weight:600;font-size:14px}
.form label.check{display:flex;align-items:center;gap:10px;cursor:pointer}
.form label.check input[type=checkbox],.form label.check input[type=radio]{width:20px;height:20px;margin:0;flex:none;accent-color:var(--accent);cursor:pointer}
input[type=text],input[type=email],input[type=password],input[type=number],textarea,select{background:var(--field-bg);color:var(--ink);
  border:1px solid var(--field-line);border-radius:var(--radius-sm);padding:10px 12px;font:inherit;font-size:16px;line-height:1.4;max-width:100%;
  transition:border-color .15s ease,box-shadow .15s ease}
input[type=text]:focus,input[type=email]:focus,input[type=password]:focus,input[type=number]:focus,textarea:focus,select:focus{
  outline:2px solid var(--accent);outline-offset:1px;border-color:var(--accent)}
input::placeholder,textarea::placeholder{color:var(--muted);opacity:1}
textarea{min-height:120px;resize:vertical;line-height:1.5}
.errors{color:var(--err);margin:0;padding-left:18px}
.note{color:var(--muted);font-size:14px}
.ok{color:var(--ok)}
audio{height:34px;vertical-align:middle}

/* ---------- shared pieces: pills, cards, page heading ---------- */
.pill{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:650;line-height:1.5}
.pill.good{background:var(--pill-good-bg);color:var(--pill-good-ink)}
.pill.warn{background:var(--pill-warn-bg);color:var(--pill-warn-ink)}
.pill.none{background:var(--pill-none-bg);color:var(--pill-none-ink)}
.pill.pub{background:var(--pill-pub-bg);color:var(--pill-pub-ink)}

/* page heading block used by catalog, pricing, account, legal and class pages */
.hero{margin:0 0 28px}
.hero h1{font-size:clamp(2.2rem,4.6vw,3.5rem);letter-spacing:-.02em;line-height:1.08;margin:0 0 14px}
.hero p,.lead{color:var(--muted);font-size:1.15rem;max-width:62ch;line-height:1.55}

.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;margin-top:18px}
.card{display:block;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;color:var(--ink);text-decoration:none;
  box-shadow:var(--shadow-soft);transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease,background-color .2s ease}
.card:hover{border-color:var(--hover-line);background:var(--hover-bg);color:var(--ink);box-shadow:var(--shadow-lift);transform:translateY(-2px)}
.card h3{margin:0 0 8px;font-family:var(--font-display);font-weight:500;font-size:22px;line-height:1.2;letter-spacing:-.01em}
.card p{margin:0 0 14px;color:var(--muted);line-height:1.5;font-size:16px}
.card .meta{font-size:12px;color:var(--accent-ink);font-weight:650;text-transform:uppercase;letter-spacing:.14em}

/* three columns of short points (For teachers) */
.l-three{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin-bottom:20px}
.l-col{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow-soft)}
.l-col h3{margin:4px 0 8px;font-size:19px}
.l-col p{color:var(--muted);line-height:1.55;margin:0 0 14px;font-size:16px}

/* questions and answers (Pages/Shared/_Faq.cshtml) */
.faq{display:grid;gap:10px;max-width:860px}
.faq details{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:16px 22px}
.faq details[open]{box-shadow:var(--shadow-soft)}
.faq summary{font-weight:650;cursor:pointer;font-size:17px}
.faq summary:hover{color:var(--ink-hi)}
.faq p{color:var(--muted);line-height:1.6;margin:10px 0 0}

/* coming lessons (Pages/Shared/_ComingNext.cshtml) */
.coming{list-style:none;padding:0;margin:16px 0 0;display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:10px}
.coming li{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 16px;font-weight:600;font-size:16px}
.coming li::before{content:"\25B6";color:var(--accent-ink);font-size:11px;margin-right:10px}

/* ---------- catalog and course pages ---------- */
.subject h2{margin:44px 0 4px}
.lesson-list{padding-left:0;list-style:none;display:grid;gap:20px;max-width:820px}
.labs{list-style:none;padding:8px 0 0 16px;margin:0}
.labs li{padding:4px 0}
.lab{font-weight:600}

/* ---------- /learn dashboard ---------- */
.learn-list{display:grid;gap:18px;margin:20px 0 32px}
.learn-item{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow-soft)}
.learn-item h2{margin:0 0 4px;font-size:22px}
.learn-item .meta{color:var(--muted);font-size:14px;margin:0 0 10px}
.lp-bar{height:8px;border-radius:999px;background:var(--surface-2);box-shadow:inset 0 0 0 1px var(--line);overflow:hidden;margin:8px 0 6px;max-width:560px}
.lp-bar span{display:block;height:100%;border-radius:999px;background:var(--accent)}
.learn-item .actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:14px}

/* ---------- /account: one card per topic ---------- */
.account-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px 24px;margin:0 0 18px;box-shadow:var(--shadow-soft)}
.account-card h2{margin:0 0 14px;font-size:22px}
.account-card .form{max-width:440px}
.account-card .row{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}
.facts{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px 20px;margin:0}
.facts dt{color:var(--muted);font-size:12px;font-weight:650;text-transform:uppercase;letter-spacing:.14em}
.facts dd{margin:2px 0 0;font-weight:600;color:var(--ink-hi);overflow-wrap:anywhere}

/* ---------- sign in / create account: a centered card ---------- */
body.page.auth main.main{max-width:540px;padding-top:56px}
body.auth .form{max-width:none;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-lift)}
body.auth .form input[type=text],body.auth .form input[type=email],body.auth .form input[type=password]{width:100%}

/* ---------- pricing and subscribe ---------- */
.plans{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:20px;margin:20px 0}
.plan{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px 28px;display:flex;flex-direction:column;box-shadow:var(--shadow-soft)}
.plan.featured{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent),var(--shadow-lift)}
.plan h2{margin:0 0 6px;font-size:24px}
.plan .price{font-family:var(--font-display);font-size:34px;font-weight:500;line-height:1.1;letter-spacing:-.02em;margin:4px 0 14px}
.plan .price span{display:block;font-family:var(--font-text);font-size:14px;font-weight:500;letter-spacing:0;line-height:1.5;color:var(--muted);margin-top:4px}
.plan ul{color:var(--muted);line-height:1.7;padding-left:20px;flex:1;font-size:16px}
.plan .btn{align-self:flex-start}
fieldset.plans{border:0;padding:0;max-width:760px}
fieldset.kind{border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 16px 14px;margin:0;display:grid;gap:10px}
fieldset.kind legend{padding:0 6px;font-weight:600;font-size:14px}
label.plan.pick{cursor:pointer;position:relative;transition:border-color .15s ease,background-color .15s ease}
label.plan.pick input{position:absolute;top:22px;right:22px;width:20px;height:20px;accent-color:var(--accent)}
label.plan.pick:has(input:checked){border-color:var(--accent);background:var(--pick-on-bg);box-shadow:0 0 0 1px var(--accent),var(--shadow-soft)}
label.plan.pick:has(input:focus-visible){outline:2px solid var(--accent);outline-offset:2px}
/* what "founding price" means to the customer (Pages/Shared/_FoundingPrice.cshtml) */
.founding{background:var(--surface);border:1px solid var(--line);border-left:4px solid var(--amber);border-radius:var(--radius);padding:18px 24px;margin:20px 0 32px;box-shadow:var(--shadow-soft)}
.founding h3{margin:0 0 8px;color:var(--warn-ink)}
.founding ul{margin:0;padding-left:20px;line-height:1.6}
.founding li{margin:4px 0}

/* ---------- legal text ---------- */
.legal-doc{max-width:72ch;line-height:1.7}
.legal-doc h2{margin:40px 0 10px;font-size:1.6rem;scroll-margin-top:calc(var(--header-h) + 12px)}
.legal-doc li{margin:0 0 8px}
.legal-doc .toc{display:flex;flex-wrap:wrap;gap:6px 18px;margin:18px 0 10px;padding:14px 18px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);font-size:14px}

/* ---------- lab page ---------- */
.lab-frame{display:block;width:100%;height:100%;border:0;background:var(--bg)}

/* ---------- lesson tools (role-gated pages): tables, panels, left nav, section and quiz tools, outbox ---------- */
.admin h1{margin-top:4px}
.admin table{border-collapse:collapse;width:100%;margin:14px 0 28px}
.admin th,.admin td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:middle;font-size:14px;line-height:1.45}
.admin th{color:var(--muted);font-weight:650;font-size:12px;text-transform:uppercase;letter-spacing:.14em;white-space:nowrap}
.admin tbody tr:hover > td{background:var(--hover-bg)}
.admin .tree ul{list-style:none;padding-left:18px}
.admin .tree li{padding:4px 0}
.admin .grid2{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px;align-items:start}
.admin .panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;box-shadow:var(--shadow-soft)}
.admin .panel h2,.admin .panel h3{margin-top:0}
.admin .panel h2{font-size:22px}
.admin .actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.admin .inline{display:inline}

.admin-nav .an-course{font-weight:650;color:var(--ink);padding:6px 10px 2px;font-size:14px}
.admin-nav ul.an-lessons{margin-bottom:6px !important}
.admin-nav a.an-lesson{padding-left:16px}
.admin-nav a.on,.admin-nav a.on:hover{background:var(--blue) !important;color:#fff !important;font-weight:650}
.admin-nav ol.an-sections{margin:2px 0 4px 18px !important;border-left:1px solid var(--line)}
.admin-nav ol.an-sections a{display:flex !important;align-items:center;gap:6px;padding:5px 8px}
.admin-nav ol.an-sections .num{min-width:1.6em;color:var(--muted);font-family:var(--font-mono);font-size:12px;font-variant-numeric:tabular-nums}
.admin-nav ol.an-sections a.on .num{color:#dbe2ff}
.admin-nav ol.an-sections .t{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.admin-nav .dot{width:8px;height:8px;border-radius:50%;flex:none}
.admin-nav .dot.warn{background:var(--amber)}
.admin-nav .tag{font-size:10px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--tag);flex:none}
.admin-nav a.on .tag{color:#fff}
.admin-nav a.an-tool{margin:4px 0 4px 18px;color:var(--tool) !important;font-weight:600}

/* section page: narration, cue marks, music, preview, timeline */
body.page:has(.section-editor) main.main{max-width:none}
.se-head{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.se-title{font-family:var(--font-display);font-size:28px !important;font-weight:500;padding:6px 10px !important;min-width:min(420px,100%);margin-top:4px}
.se-public{display:flex;gap:6px;align-items:center;font-weight:600}
.se-grid{display:grid;grid-template-columns:minmax(520px,1.15fr) minmax(420px,1fr);gap:20px;align-items:start}
@media (max-width:1300px){.se-grid{grid-template-columns:minmax(0,1fr)}}
.se-left{display:grid;gap:20px;min-width:0}
.se-left>.panel{min-width:0;overflow-x:auto}
.se-right{position:sticky;top:calc(var(--header-h) + 12px);min-width:0}
.section-editor textarea#text{width:100%;min-height:150px}
.se-narr{white-space:pre-wrap;line-height:2.1;font-size:17px;padding:14px 16px;background:var(--field-bg);border:1px solid var(--line);border-radius:var(--radius-sm);margin:10px 0}
.se-narr.picking{outline:3px solid var(--amber);cursor:text}
/* cue marks: fixed bright fills with fixed dark text, the same in both themes */
.se-narr mark{color:#0b1020;border-radius:5px;padding:2px 3px;font-weight:600}
.se-narr mark[data-n]::before{content:attr(data-n);display:inline-block;font-size:11px;font-weight:800;background:#0b1020;color:#fff;border-radius:999px;padding:0 6px;margin-right:4px;vertical-align:2px;user-select:none}
.se-pick{background:var(--pick-bg);color:var(--pick-ink);padding:10px 14px;border-radius:var(--radius-sm);margin-bottom:10px}
.se-cues{width:100%}
.se-cues input.phrase{width:100%;min-width:130px}
.se-cues td.label{max-width:260px;line-height:1.35}
.admin .se-cues td.actions{display:table-cell;width:1%}
.se-cues td.actions button{display:block;width:100%;margin:2px 0;padding:6px 10px;font-size:13px;white-space:nowrap}
.row-warn{color:var(--warn-ink);font-size:12px;margin-top:3px}
.cue-num{display:inline-flex;width:24px;height:24px;border-radius:50%;align-items:center;justify-content:center;font-weight:800;font-size:12px;color:#0b1020}
.c0{background:#29d3ff}.c1{background:#ffb020}.c2{background:#a78bfa}.c3{background:#3ddc84}
.c4{background:#f472b6}.c5{background:#fde68a}.c6{background:#5eead4}.c7{background:#fb923c}
mark.music,.tick.music{background:#c4b5fd}
.se-music{display:grid;gap:14px}
.se-music,.se-music>*,.se-music label{min-width:0}
.se-music label{display:grid;gap:6px;font-weight:600}
.se-music label.radio{display:flex;gap:8px;align-items:center;font-weight:400;flex-wrap:wrap}
.se-music select{width:100%;max-width:100%}
.se-music #musicPhrase{flex:1;min-width:200px}
#musicStart.disabled{opacity:.45;pointer-events:none}
.se-preview iframe{width:100%;aspect-ratio:16/10;border:0;border-radius:var(--radius-sm);background:var(--bg)}
.se-timeline{position:relative;height:30px;margin:10px 0;background:var(--field-bg);border:1px solid var(--line);border-radius:8px;cursor:pointer}
.se-timeline .tick{position:absolute;top:3px;transform:translateX(-50%);width:22px;height:22px;border-radius:50%;font-size:11px;font-weight:800;color:#0b1020;display:flex;align-items:center;justify-content:center}
.se-timeline .playhead{position:absolute;top:-3px;bottom:-3px;width:2px;background:var(--ink);left:0;pointer-events:none}

/* quiz page (Pages/Admin/QuizEditor) */
.quiz-editor [hidden]{display:none !important}
.quiz-editor fieldset{border:1px solid var(--line);border-radius:var(--radius-sm);padding:12px 14px;display:grid;gap:8px;margin:0}
.quiz-editor legend{color:var(--muted);font-size:13px;padding:0 6px}
.quiz-error{background:var(--pill-warn-bg);color:var(--pill-warn-ink);border-radius:var(--radius-sm);padding:12px 16px;margin:0 0 18px;font-weight:650}

/* outbox: the text of an unsent message */
.mail-html{display:block;width:min(680px,100%);height:720px;border:1px solid var(--line);border-radius:var(--radius-sm);margin:8px 0;background:var(--surface)}
.mail-text summary{font-size:13px;color:var(--muted);cursor:pointer}
.mail-body{white-space:pre-wrap;overflow-wrap:anywhere;background:var(--field-bg);color:var(--ink);padding:12px 14px;border-radius:var(--radius-sm);margin:8px 0 0;max-width:70ch;
  font-family:var(--font-mono);font-size:14px;line-height:1.55}

/* ---------- small screens (down to 360 px) ---------- */
@media (max-width:860px){
  /* header becomes two fixed rows: brand and account on top, the site nav below it, scrolling sideways */
  :root{--header-h:100px}
  header.top{display:grid;grid-template-columns:auto minmax(0,1fr);grid-template-rows:56px 44px;gap:0 10px;padding:0 14px;align-items:center}
  .brand{grid-row:1;grid-column:1;font-size:19px}
  .account{grid-row:1;grid-column:2;justify-self:end;margin-left:0;gap:10px;min-width:0;max-width:100%}
  .topnav{grid-row:2;grid-column:1/-1;gap:22px;align-self:stretch;border-top:1px solid var(--line);margin:0 -14px;padding:0 14px}
  .crumbs{display:none}
  .account #accountLink{max-width:24vw;overflow:hidden;text-overflow:ellipsis}
  .account form#viewAs button{max-width:13ch;overflow:hidden;text-overflow:ellipsis}
  .account button,.account a.btn{padding:8px 10px}
  /* the left nav moves above the content */
  body:has(> aside.nav){grid-template-columns:minmax(0,1fr);grid-template-rows:auto auto 1fr auto}
  aside.nav{position:static;height:auto;max-height:38vh;border-right:0;border-bottom:1px solid var(--line);padding:12px 10px 16px}
  body.app:has(> aside.nav){grid-template-rows:auto auto minmax(0,1fr)}
  body.app:has(> aside.nav) aside.nav{max-height:30vh}
  body.app:has(> aside.nav) main.main{height:auto;min-height:0}
  body.page main.main{padding:28px var(--gutter) 64px}
  footer.site{padding-top:40px}
  footer.site .foot-links{gap:24px 40px}
  .se-title{min-width:0;width:100%}
  .cards{grid-template-columns:minmax(0,1fr)}
  .plan{padding:22px}
}
@media (max-width:440px){
  /* brand shows the mark only (the link keeps its accessible name) */
  header.top .brand{font-size:0;gap:0}
  .account{gap:8px;font-size:13px}
  .account form#viewAs button{max-width:9ch}
  body.auth .form{padding:20px}
  .coming{grid-template-columns:minmax(0,1fr)}
}