/* ============================================================
   WEB ENGINEER — Components
   ============================================================ */

/* ---------- HERO ---------- */
.hero{position:relative;min-height:clamp(620px,96vh,980px);display:flex;align-items:center;
  padding-top:calc(var(--nav-h) + 3rem);padding-bottom:4rem;overflow:hidden}
#hero-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:0;opacity:.85}
.hero-inner{position:relative;z-index:3;display:grid;grid-template-columns:1.2fr .8fr;
  gap:clamp(2rem,5vw,4rem);align-items:center;width:100%}
@media(max-width:1000px){.hero-inner{grid-template-columns:1fr}.hero{min-height:auto}}

.hero-badge{display:inline-flex;align-items:center;gap:.55rem;padding:.4rem .4rem .4rem .85rem;
  border-radius:var(--r-full);border:1px solid var(--line-hi);background:var(--surface);
  backdrop-filter:blur(10px);font-size:var(--t-xs);color:var(--text-soft);margin-bottom:var(--sp-5)}
.hero-badge b{color:var(--text);font-weight:600}
.hero-badge .tag{padding:.18rem .55rem;border-radius:var(--r-full);background:var(--grad-brand);
  color:#07070b;font-weight:700;font-size:.68rem;letter-spacing:.02em}

.hero-inner > *{min-width:0}
.hero h1{margin-bottom:var(--sp-5);font-size:clamp(2.5rem,1.1rem + 4.4vw,4.5rem)}
.hero h1 .line{display:block;overflow:hidden}
.hero h1 .line > span{display:block;animation:riseIn .9s var(--e-out) both}
.hero h1 .typed-wrap{white-space:nowrap}
.hero h1 .line:nth-child(2) > span{animation-delay:.1s}
.hero h1 .line:nth-child(3) > span{animation-delay:.2s}
@keyframes riseIn{from{transform:translateY(100%);opacity:0}to{transform:none;opacity:1}}

.hero-cta{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:var(--sp-6)}
.hero-stats{display:flex;gap:clamp(1.2rem,3vw,2.6rem);margin-top:clamp(2rem,4vw,3rem);flex-wrap:wrap}
.hero-stat b{display:block;font-family:var(--f-display);font-size:var(--t-2xl);
  font-weight:650;letter-spacing:-.04em;line-height:1}
.hero-stat span{font-size:var(--t-xs);color:var(--text-dim);text-transform:uppercase;letter-spacing:.1em}

/* typing cursor */
/* The caret is a border on the typed word rather than a sibling element: a
   sibling moves on every keystroke and each move counts as a layout shift. */
#typed{color:var(--brand-hi);padding-right:6px;border-right:3px solid var(--cyan);
  animation:caret 1s steps(2) infinite}
@keyframes caret{50%{border-right-color:transparent}}
.hero-stat b{font-variant-numeric:tabular-nums}

/* hero code window */
.code-win{background:#0c0c13;border:1px solid rgba(255,255,255,.1);border-radius:var(--r-lg);color:#a7acbd;
  overflow:hidden;box-shadow:var(--sh-lg);transform:perspective(1400px) rotateY(-7deg) rotateX(3deg);
  transition:transform .6s var(--e-out)}
.code-win:hover{transform:perspective(1400px) rotateY(-2deg) rotateX(1deg)}
.code-bar{display:flex;align-items:center;gap:.5rem;padding:.65rem .9rem;
  border-bottom:1px solid rgba(255,255,255,.08);background:#12121c}
.code-bar i{width:11px;height:11px;border-radius:50%;background:#ff5f57;flex:none}
.code-bar i:nth-child(2){background:#febc2e} .code-bar i:nth-child(3){background:#28c840}
.code-bar .f{margin-left:.6rem;font-family:var(--f-mono);font-size:var(--t-xs);color:#8b92a8}
.code-body{padding:1.1rem 1.2rem;font-family:var(--f-mono);font-size:.78rem;line-height:1.85;
  overflow-x:auto;color:#a7acbd}
.code-body .ln{display:block;white-space:pre}
.tk-key{color:#c792ea} .tk-str{color:#a3e635} .tk-fn{color:#82aaff}
.tk-num{color:#fbbf24} .tk-com{color:#7d849a;font-style:italic} .tk-tag{color:#fb7185}
.tk-attr{color:#22d3ee} .tk-pun{color:#8b92a8}

/* ---------- MARQUEE ---------- */
.marquee{overflow:hidden;position:relative;padding-block:var(--sp-5);
  border-block:1px solid var(--line);background:var(--bg-elev)}
.marquee::before,.marquee::after{content:"";position:absolute;top:0;bottom:0;width:140px;z-index:2;pointer-events:none}
.marquee::before{left:0;background:linear-gradient(90deg,var(--bg-elev),transparent)}
.marquee::after{right:0;background:linear-gradient(270deg,var(--bg-elev),transparent)}
.marquee-track{display:flex;gap:clamp(2rem,5vw,4rem);width:max-content;animation:slide 32s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
@keyframes slide{to{transform:translateX(-50%)}}
.marquee-item{display:flex;align-items:center;gap:.6rem;font-family:var(--f-display);
  font-size:var(--t-lg);font-weight:600;color:var(--text-dim);letter-spacing:-.02em;
  transition:color var(--d-fast);white-space:nowrap}
.marquee-item:hover{color:var(--text)}
.marquee-item svg{width:22px;height:22px}

/* ---------- BENTO ---------- */
.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:var(--sp-4);grid-auto-rows:minmax(150px,auto)}
.bento > *{grid-column:span 2}
.b-wide{grid-column:span 4} .b-full{grid-column:span 6}
.b-tall{grid-row:span 2}
@media(max-width:980px){.bento{grid-template-columns:repeat(2,1fr)}
  .bento > *,.b-wide,.b-full{grid-column:span 2}.b-tall{grid-row:span 1}}
@media(max-width:620px){.bento{grid-template-columns:1fr}.bento > *,.b-wide,.b-full{grid-column:span 1}}

.b-card{display:flex;flex-direction:column;gap:.7rem;padding:var(--sp-5);
  background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-lg);
  position:relative;overflow:hidden;
  transition:border-color var(--d),transform var(--d) var(--e-out),background var(--d)}
.b-card:hover{border-color:var(--line-hi);transform:translateY(-3px)}
.b-card h3{font-size:var(--t-lg)}
.b-card p{font-size:var(--t-sm);line-height:1.6}
.b-ico{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;
  background:var(--surface-hi);border:1px solid var(--line);color:var(--brand-hi);margin-bottom:.3rem}
.b-ico svg{width:20px;height:20px}
.b-card .shine{position:absolute;width:260px;height:260px;border-radius:50%;
  background:radial-gradient(circle,rgba(13,148,136,.22),transparent 70%);
  top:-120px;right:-80px;pointer-events:none;opacity:0;transition:opacity var(--d)}
.b-card:hover .shine{opacity:1}

/* ---------- SERVICE / FEATURE LIST ---------- */
.feat-row{display:flex;gap:var(--sp-4);align-items:flex-start;padding:var(--sp-4) 0;
  border-bottom:1px solid var(--line)}
.feat-row:last-child{border-bottom:0}
.feat-num{font-family:var(--f-mono);font-size:var(--t-xs);color:var(--brand-hi);flex:none;padding-top:.3rem;width:34px}
.feat-row h4{margin-bottom:.3rem}
.feat-row p{font-size:var(--t-sm)}

.check-list li{display:flex;gap:.6rem;align-items:flex-start;font-size:var(--t-sm);
  color:var(--text-soft);padding:.3rem 0}
.check-list li::before{content:"";flex:none;width:17px;height:17px;border-radius:50%;margin-top:.25rem;
  background:rgba(163,230,53,.16);border:1px solid rgba(163,230,53,.45);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a3e635' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size:11px;background-position:center;background-repeat:no-repeat}

/* ---------- COURSE CARD ---------- */
.course-card{display:flex;flex-direction:column;background:var(--bg-elev);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;position:relative;
  transition:transform var(--d) var(--e-out),border-color var(--d),box-shadow var(--d)}
.course-card:hover{transform:translateY(-6px);border-color:var(--line-hi);box-shadow:var(--sh-md)}
.cc-cover{position:relative;aspect-ratio:16/9;display:grid;place-items:center;overflow:hidden;
  border-bottom:1px solid var(--line)}
.cc-cover::after{content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.07) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.07) 1px,transparent 1px);
  background-size:26px 26px;opacity:.5}
.cc-cover .glyph{position:relative;z-index:2;font-family:var(--f-display);font-weight:700;
  font-size:2.6rem;color:rgba(255,255,255,.95);letter-spacing:-.05em;
  text-shadow:0 6px 24px rgba(0,0,0,.4)}
.cc-cover .lvl{position:absolute;top:.7rem;left:.7rem;z-index:3}
.cc-cover .price{position:absolute;top:.7rem;right:.7rem;z-index:3;padding:.3rem .65rem;
  border-radius:var(--r-full);background:rgba(7,7,11,.72);backdrop-filter:blur(8px);
  font-size:var(--t-xs);font-weight:650;color:#fff;border:1px solid rgba(255,255,255,.14)}
.cc-body{padding:var(--sp-5);display:flex;flex-direction:column;gap:.7rem;flex:1}
.cc-body h3{font-size:var(--t-lg);line-height:1.25}
.cc-body > p{font-size:var(--t-sm);line-height:1.55;flex:1}
.cc-meta{display:flex;gap:1rem;flex-wrap:wrap;font-size:var(--t-xs);color:var(--text-dim);
  padding-top:.6rem;border-top:1px solid var(--line)}
.cc-meta span{display:flex;align-items:center;gap:.33rem}
.cc-meta svg{width:14px;height:14px;opacity:.8}
.cc-tags{display:flex;gap:.35rem;flex-wrap:wrap}
.cc-rate{display:flex;align-items:center;gap:.3rem;color:var(--amber);font-weight:600}
.cc-prog{height:4px;border-radius:99px;background:var(--surface-hi);overflow:hidden}
.cc-prog i{display:block;height:100%;border-radius:99px;background:var(--grad-brand);transition:width .6s var(--e-out)}

/* ---------- FILTER BAR ---------- */
.filters{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center;margin-bottom:var(--sp-6)}
.chip{padding:.45rem .95rem;border-radius:var(--r-full);border:1px solid var(--line);
  background:var(--surface);font-size:var(--t-sm);color:var(--text-soft);
  transition:all var(--d-fast);white-space:nowrap}
.chip:hover{border-color:var(--line-hi);color:var(--text)}
.chip.active{background:var(--text);color:var(--bg);border-color:transparent;font-weight:600}
.search-box{position:relative;flex:1;min-width:230px}
.search-box svg{position:absolute;left:.9rem;top:50%;transform:translateY(-50%);
  width:17px;height:17px;color:var(--text-dim);pointer-events:none}
.search-box input{width:100%;padding:.7rem 1rem .7rem 2.6rem;border-radius:var(--r-full);
  background:var(--surface);border:1px solid var(--line);font-size:var(--t-sm);
  transition:border-color var(--d-fast),background var(--d-fast)}
.search-box input:focus{border-color:var(--brand);background:var(--bg-elev)}
.search-box input::placeholder{color:var(--text-dim)}

/* ---------- FORM ---------- */
.field{display:flex;flex-direction:column;gap:.45rem;margin-bottom:var(--sp-4)}
.field label{font-size:var(--t-sm);font-weight:560;color:var(--text)}
.field .hint{font-size:var(--t-xs);color:var(--text-dim)}
.input,.textarea,.select{width:100%;padding:.78rem 1rem;border-radius:var(--r-md);
  background:var(--surface);border:1px solid var(--line);font-size:var(--t-sm);
  color:var(--text);transition:border-color var(--d-fast),background var(--d-fast)}
.input:focus,.textarea:focus,.select:focus{border-color:var(--brand);background:var(--bg-elev)}
.input::placeholder,.textarea::placeholder{color:var(--text-dim)}
.textarea{resize:vertical;min-height:130px;line-height:1.6}
.select{appearance:none;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236e7489' stroke-width='2.2' stroke-linecap='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right .9rem center;background-size:15px;padding-right:2.4rem}
.field.err .input,.field.err .textarea,.field.err .select{border-color:var(--rose)}
.field .err-msg{font-size:var(--t-xs);color:var(--rose);display:none}
.field.err .err-msg{display:block}

/* ---------- PRICING ---------- */
.price-card{position:relative;display:flex;flex-direction:column;gap:var(--sp-4);
  padding:var(--sp-6);background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-xl);
  transition:transform var(--d) var(--e-out),border-color var(--d)}
.price-card:hover{transform:translateY(-5px);border-color:var(--line-hi)}
.price-card.featured{border-color:rgba(13,148,136,.5);background:
  linear-gradient(180deg,rgba(13,148,136,.1),transparent 45%),var(--bg-elev);
  box-shadow:0 30px 70px -30px rgba(13,148,136,.5)}
.price-card .ribbon{position:absolute;top:-11px;left:50%;transform:translateX(-50%);
  padding:.25rem .8rem;border-radius:var(--r-full);background:var(--grad-brand);
  color:#07070b;font-size:.68rem;font-weight:750;letter-spacing:.06em;text-transform:uppercase}
.price-amt{font-family:var(--f-display);font-size:var(--t-3xl);font-weight:650;letter-spacing:-.04em;line-height:1}
.price-amt sup{font-size:.4em;vertical-align:super;color:var(--text-dim);font-weight:500}
.price-amt small{font-size:.32em;color:var(--text-dim);font-weight:500;letter-spacing:0}

/* ---------- TIMELINE / PROCESS ---------- */
.timeline{position:relative;padding-left:2.2rem}
.timeline::before{content:"";position:absolute;left:9px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--brand),var(--cyan),transparent)}
.tl-item{position:relative;padding-bottom:var(--sp-6)}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{content:"";position:absolute;left:-2.2rem;top:6px;width:19px;height:19px;
  border-radius:50%;background:var(--bg);border:2px solid var(--brand);
  box-shadow:0 0 0 4px rgba(13,148,136,.14)}
.tl-item h4{margin-bottom:.3rem}
.tl-item .step{font-family:var(--f-mono);font-size:var(--t-xs);color:var(--brand-hi);
  text-transform:uppercase;letter-spacing:.12em;margin-bottom:.25rem;display:block}

/* ---------- TESTIMONIAL ---------- */
.quote{display:flex;flex-direction:column;gap:var(--sp-4);height:100%}
.quote p{font-size:var(--t-base);line-height:1.68;color:var(--text);flex:1}
.quote .who{display:flex;align-items:center;gap:.75rem}
.avatar{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;flex:none;
  font-family:var(--f-display);font-weight:700;font-size:.9rem;color:#07070b;background:var(--grad-brand)}
.quote .who b{display:block;font-size:var(--t-sm);font-weight:620;color:var(--text)}
.quote .who span{font-size:var(--t-xs);color:var(--text-dim)}
.stars{display:flex;gap:2px;color:var(--amber)}
.stars svg{width:14px;height:14px}

/* ---------- ACCORDION / FAQ ---------- */
.acc{border-bottom:1px solid var(--line)}
.acc-head{width:100%;display:flex;justify-content:space-between;align-items:center;gap:var(--sp-4);
  padding:1.15rem 0;text-align:left;font-family:var(--f-display);font-size:var(--t-lg);
  font-weight:550;letter-spacing:-.02em;transition:color var(--d-fast)}
.acc-head:hover{color:var(--brand-hi)}
.acc-ico{flex:none;width:26px;height:26px;border-radius:50%;border:1px solid var(--line-hi);
  display:grid;place-items:center;position:relative;transition:all var(--d)}
.acc-ico::before,.acc-ico::after{content:"";position:absolute;background:currentColor;border-radius:2px}
.acc-ico::before{width:11px;height:1.6px}
.acc-ico::after{width:1.6px;height:11px;transition:transform var(--d) var(--e-out)}
.acc.open .acc-ico{background:var(--brand);border-color:var(--brand);color:#fff}
.acc.open .acc-ico::after{transform:scaleY(0)}
.acc-body{display:grid;grid-template-rows:0fr;transition:grid-template-rows var(--d) var(--e-out)}
.acc.open .acc-body{grid-template-rows:1fr}
.acc-body > div{overflow:hidden}
.acc-body p{padding-bottom:1.15rem;font-size:var(--t-sm);max-width:72ch}

/* ---------- STAT STRIP ---------- */
.stat-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);
  border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}
.stat-cell{background:var(--bg-elev);padding:var(--sp-5);text-align:center}
.stat-cell b{display:block;font-family:var(--f-display);font-size:var(--t-2xl);
  font-weight:650;letter-spacing:-.04em;line-height:1;margin-bottom:.35rem}
.stat-cell span{font-size:var(--t-xs);color:var(--text-dim);text-transform:uppercase;letter-spacing:.1em}
@media(max-width:760px){.stat-strip{grid-template-columns:repeat(2,1fr)}}

/* ---------- CTA BAND ---------- */
.cta-band{position:relative;overflow:hidden;border-radius:var(--r-xl);
  border:1px solid rgba(13,148,136,.35);padding:clamp(2.5rem,6vw,5rem);text-align:center;
  background:radial-gradient(900px circle at 50% -40%,rgba(13,148,136,.3),transparent 60%),var(--bg-elev)}
.cta-band::before{content:"";position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),
                   linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(ellipse 70% 70% at 50% 50%,#000,transparent 75%);
  mask-image:radial-gradient(ellipse 70% 70% at 50% 50%,#000,transparent 75%)}

/* ---------- AI CHATBOT ---------- */
.bot-fab{position:fixed;right:clamp(14px,3vw,26px);bottom:clamp(14px,3vw,26px);z-index:900;
  width:58px;height:58px;border-radius:50%;display:grid;place-items:center;
  background:var(--grad-brand);color:#07070b;box-shadow:0 14px 40px -10px rgba(13,148,136,.85);
  transition:transform var(--d) var(--e-out),box-shadow var(--d)}
.bot-fab:hover{transform:scale(1.08) rotate(6deg)}
.bot-fab svg{width:25px;height:25px}
.bot-fab .badge{position:absolute;top:-2px;right:-2px;width:17px;height:17px;border-radius:50%;
  background:var(--rose);color:#fff;font-size:.6rem;font-weight:700;display:grid;place-items:center;
  border:2px solid var(--bg)}
.bot-fab.hide{transform:scale(0);opacity:0;pointer-events:none}

.bot{position:fixed;right:clamp(10px,3vw,26px);bottom:clamp(10px,3vw,26px);z-index:950;
  width:min(410px,calc(100vw - 20px));height:min(630px,calc(100dvh - 40px));
  display:flex;flex-direction:column;border-radius:var(--r-xl);overflow:hidden;
  background:var(--bg-elev);border:1px solid var(--line-hi);box-shadow:var(--sh-lg);
  transform:translateY(22px) scale(.95);opacity:0;pointer-events:none;transform-origin:bottom right;
  transition:transform var(--d) var(--e-out),opacity var(--d) var(--e-out)}
.bot.open{transform:none;opacity:1;pointer-events:auto}
.bot-head{display:flex;align-items:center;gap:.7rem;padding:.85rem 1rem;
  border-bottom:1px solid var(--line);background:var(--bg-elev-2);flex:none}
.bot-head .av{width:36px;height:36px;border-radius:11px;background:var(--grad-brand);
  display:grid;place-items:center;color:#07070b;flex:none}
.bot-head .av svg{width:19px;height:19px}
.bot-head b{font-size:var(--t-sm);display:block;line-height:1.3}
.bot-head small{font-size:var(--t-xs);color:var(--lime);display:flex;align-items:center;gap:.3rem}
.bot-head .acts{margin-left:auto;display:flex;gap:.25rem}
.bot-head .acts button{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;
  color:var(--text-dim);transition:all var(--d-fast)}
.bot-head .acts button:hover{color:var(--text);background:var(--surface-hi)}
.bot-head .acts svg{width:16px;height:16px}

.bot-log{flex:1;overflow-y:auto;padding:1rem;display:flex;flex-direction:column;gap:.85rem;
  scroll-behavior:smooth}
.msg{display:flex;gap:.6rem;max-width:88%;animation:msgIn .36s var(--e-out) both}
@keyframes msgIn{from{opacity:0;transform:translateY(10px)}}
.msg.me{align-self:flex-end;flex-direction:row-reverse}
.msg .ic{width:27px;height:27px;border-radius:8px;flex:none;display:grid;place-items:center;
  background:var(--surface-hi);border:1px solid var(--line);color:var(--brand-hi)}
.msg.me .ic{background:var(--brand);border-color:transparent;color:#fff}
.msg .ic svg{width:14px;height:14px}
.bub{padding:.65rem .9rem;border-radius:14px;font-size:var(--t-sm);line-height:1.6;
  background:var(--surface-hi);border:1px solid var(--line);color:var(--text)}
.msg.me .bub{background:var(--brand);border-color:transparent;color:#fff;border-bottom-right-radius:5px}
.msg.bot .bub{border-bottom-left-radius:5px}
.bub p+p{margin-top:.5rem}
.bub strong{color:var(--text);font-weight:650}
.msg.me .bub strong{color:#fff}
.bub ul{margin:.45rem 0 0;display:flex;flex-direction:column;gap:.3rem}
.bub li{padding-left:.9rem;position:relative}
.bub li::before{content:"";position:absolute;left:0;top:.62em;width:4px;height:4px;
  border-radius:50%;background:var(--brand-hi)}
.bub code{font-family:var(--f-mono);font-size:.84em;background:rgba(13,148,136,.16);
  padding:.1rem .33rem;border-radius:5px;color:var(--brand-hi)}
.bub a{color:var(--cyan);text-decoration:underline;text-underline-offset:2px}
.bub pre{margin-top:.5rem;background:var(--bg);border:1px solid var(--line);border-radius:10px;
  padding:.65rem .8rem;overflow-x:auto}
.bub pre code{background:none;padding:0;color:var(--text-soft);font-size:.78rem;line-height:1.7}

.typing{display:flex;gap:4px;padding:.8rem .9rem}
.typing i{width:6px;height:6px;border-radius:50%;background:var(--text-dim);animation:bounce 1.2s infinite}
.typing i:nth-child(2){animation-delay:.16s} .typing i:nth-child(3){animation-delay:.32s}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-5px);opacity:1}}

.bot-chips{display:flex;gap:.4rem;padding:0 1rem .7rem;flex-wrap:wrap;flex:none}
.bot-chips button{padding:.35rem .7rem;border-radius:var(--r-full);border:1px solid var(--line-hi);
  background:var(--surface);font-size:var(--t-xs);color:var(--text-soft);transition:all var(--d-fast)}
.bot-chips button:hover{background:rgba(13,148,136,.14);border-color:var(--brand);color:var(--brand-hi)}
.bot-foot{flex:none;padding:.7rem;border-top:1px solid var(--line);background:var(--bg-elev-2)}
.bot-input{display:flex;align-items:flex-end;gap:.4rem;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-lg);padding:.35rem .35rem .35rem .85rem;
  transition:border-color var(--d-fast)}
.bot-input:focus-within{border-color:var(--brand)}
.bot-input textarea{flex:1;resize:none;max-height:110px;font-size:var(--t-sm);line-height:1.5;
  padding:.5rem 0;background:none}
.bot-input textarea::placeholder{color:var(--text-dim)}
.bot-send{width:34px;height:34px;border-radius:10px;background:var(--brand);color:#fff;
  display:grid;place-items:center;flex:none;transition:all var(--d-fast)}
.bot-send:hover{background:var(--brand-hi);transform:scale(1.06)}
.bot-send:disabled{opacity:.4;pointer-events:none}
.bot-send svg{width:16px;height:16px}
.mic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;flex:none;
  color:var(--text-dim);transition:all var(--d-fast)}
.mic:hover{color:var(--text);background:var(--surface-hi)}
.mic.rec{color:var(--rose);background:rgba(251,113,133,.14);animation:pulse 1.4s infinite}
.mic svg{width:16px;height:16px}
.bot-note{text-align:center;font-size:.66rem;color:var(--text-dim);margin-top:.45rem}

/* bot settings drawer */
.bot-set{position:absolute;inset:0;z-index:5;background:var(--bg-elev);padding:1rem;
  display:flex;flex-direction:column;gap:.9rem;overflow-y:auto;
  transform:translateY(100%);transition:transform var(--d) var(--e-out)}
.bot-set.open{transform:none}
.bot-set h4{font-size:var(--t-base)}
.bot-set .row{display:flex;align-items:center;justify-content:space-between;gap:.8rem;
  padding:.7rem 0;border-bottom:1px solid var(--line)}
.bot-set .row span{font-size:var(--t-sm)}
.bot-set .row small{display:block;font-size:var(--t-xs);color:var(--text-dim)}

/* toggle */
/* The switch itself stays 42x24; the padding box gives a finger something
   to land on without changing how it looks. */
.toggle{position:relative;width:42px;height:24px;box-sizing:content-box;padding:3px 0;background-clip:content-box;border-radius:99px;background:var(--surface-hi);
  border:1px solid var(--line-hi);flex:none;transition:background var(--d-fast),border-color var(--d-fast)}
.toggle::after{content:"";position:absolute;top:2px;left:2px;width:18px;height:18px;border-radius:50%;
  background:var(--text-dim);transition:transform var(--d) var(--e-out),background var(--d-fast)}
.toggle.on{background:rgba(13,148,136,.3);border-color:var(--brand)}
.toggle.on::after{transform:translateX(18px);background:var(--brand-hi)}

/* ---------- AI LAB ---------- */
.lab-grid{display:grid;grid-template-columns:260px 1fr;gap:var(--sp-5);align-items:start}
.lab-grid > *{min-width:0}
@media(max-width:900px){.lab-grid{grid-template-columns:1fr}}
.lab-nav{display:flex;flex-direction:column;gap:.25rem;position:sticky;top:calc(var(--nav-h) + 20px)}
@media(max-width:900px){.lab-nav{position:static;flex-direction:row;overflow-x:auto;padding-bottom:.4rem}}
.lab-tab{display:flex;align-items:center;gap:.65rem;padding:.7rem .9rem;border-radius:var(--r-md);
  font-size:var(--t-sm);color:var(--text-soft);text-align:left;transition:all var(--d-fast);white-space:nowrap}
.lab-tab:hover{background:var(--surface);color:var(--text)}
.lab-tab.active{background:var(--surface-hi);color:var(--text);font-weight:560;
  box-shadow:inset 2px 0 0 var(--brand)}
.lab-tab svg{width:17px;height:17px;flex:none;opacity:.85}
.lab-panel{display:none;animation:fadeUp .4s var(--e-out)}
.lab-panel.active{display:block}
@keyframes fadeUp{from{opacity:0;transform:translateY(12px)}}
.lab-out{background:var(--bg);border:1px solid var(--line);border-radius:var(--r-md);
  padding:var(--sp-4);min-height:120px;font-size:var(--t-sm);line-height:1.7}
.lab-out:empty::before{content:"Output will appear here.";color:var(--text-dim);font-style:italic}

.meter{height:8px;border-radius:99px;background:var(--surface-hi);overflow:hidden;position:relative}
.meter i{display:block;height:100%;border-radius:99px;transition:width .5s var(--e-out)}
.kw{display:inline-flex;align-items:center;gap:.35rem;padding:.25rem .6rem;border-radius:var(--r-full);
  background:rgba(13,148,136,.14);border:1px solid rgba(13,148,136,.32);color:var(--brand-hi);
  font-size:var(--t-xs);margin:.15rem}
.kw b{color:var(--text);font-weight:600}

/* swatch */
.swatches{display:grid;grid-template-columns:repeat(auto-fit,minmax(110px,1fr));gap:.6rem}
.swatch{border-radius:var(--r-md);overflow:hidden;border:1px solid var(--line);cursor:pointer;
  transition:transform var(--d-fast)}
.swatch:hover{transform:translateY(-3px)}
.swatch .c{height:72px}
.swatch .h{padding:.4rem .55rem;font-family:var(--f-mono);font-size:.68rem;
  background:var(--bg-elev);color:var(--text-soft);text-align:center}

/* ---------- PLAYGROUND ---------- */
.pg{display:grid;grid-template-columns:1fr 1fr;gap:var(--sp-4);height:min(72vh,720px)}
.pg > *{min-width:0}
@media(max-width:900px){.pg{grid-template-columns:1fr;height:auto}}
.pg-editor{display:flex;flex-direction:column;background:var(--bg-elev);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;min-height:0}
.pg-tabs{display:flex;border-bottom:1px solid var(--line);background:var(--bg-elev-2);flex:none;
  overflow-x:auto;scrollbar-width:none}
.pg-tabs::-webkit-scrollbar{display:none}
.pg-tabs > *{flex:none}
.pg-tab{padding:.65rem 1.1rem;font-family:var(--f-mono);font-size:var(--t-xs);color:var(--text-dim);
  border-bottom:2px solid transparent;transition:all var(--d-fast)}
.pg-tab:hover{color:var(--text-soft)}
.pg-tab.active{color:var(--text);border-bottom-color:var(--brand);background:var(--bg-elev)}
.pg-tab .d{display:inline-block;width:7px;height:7px;border-radius:2px;margin-right:.45rem}
.pg-code{flex:1;min-height:260px;width:100%;padding:1rem;font-family:var(--f-mono);font-size:.8rem;
  line-height:1.75;background:var(--bg-elev);resize:none;tab-size:2;white-space:pre;overflow:auto}
.pg-code[hidden]{display:none}
.pg-preview{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;display:flex;flex-direction:column;min-height:320px}
.pg-bar{display:flex;align-items:center;gap:.5rem;padding:.5rem .8rem;background:var(--bg-elev-2);
  border-bottom:1px solid var(--line);flex:none}
.pg-bar .url{flex:1;padding:.28rem .7rem;border-radius:var(--r-full);background:var(--bg);
  font-family:var(--f-mono);font-size:.68rem;color:var(--text-dim);border:1px solid var(--line)}
.pg-preview iframe{flex:1;width:100%;border:0;background:#fff}

/* ---------- DASHBOARD ---------- */
.dash{display:grid;grid-template-columns:230px 1fr;gap:var(--sp-6);align-items:start}
.dash > *{min-width:0}
@media(max-width:900px){.dash{grid-template-columns:1fr}}
.ring{--p:0;width:92px;height:92px;border-radius:50%;display:grid;place-items:center;flex:none;
  background:conic-gradient(var(--brand) calc(var(--p)*1%), var(--surface-hi) 0)}
.ring::before{content:"";position:absolute;width:72px;height:72px;border-radius:50%;background:var(--bg-elev)}
.ring b{position:relative;font-family:var(--f-display);font-size:1.1rem;font-weight:650}

.lesson-row{display:flex;align-items:center;gap:.8rem;padding:.75rem .9rem;border-radius:var(--r-md);
  border:1px solid transparent;transition:all var(--d-fast);cursor:pointer;width:100%;text-align:left}
.lesson-row:hover{background:var(--surface);border-color:var(--line)}
.lesson-row.active{background:rgba(13,148,136,.12);border-color:rgba(13,148,136,.35)}
.lesson-row .n{width:26px;height:26px;border-radius:50%;border:1px solid var(--line-hi);flex:none;
  display:grid;place-items:center;font-size:.7rem;font-family:var(--f-mono);color:var(--text-dim)}
.lesson-row.done .n{background:var(--lime);border-color:var(--lime);color:#07070b}
.lesson-row .t{flex:1;font-size:var(--t-sm);line-height:1.4}
.lesson-row .d{font-size:var(--t-xs);color:var(--text-dim);font-family:var(--f-mono)}

/* lesson content prose */
.prose{max-width:76ch}
.prose h2,.prose h3{margin:1.8rem 0 .7rem;font-size:var(--t-xl)}
.prose > h2:first-child,.prose > h3:first-child{margin-top:0}
.prose h4{margin:1.4rem 0 .5rem;font-size:var(--t-lg);color:var(--text)}
.prose p{margin-bottom:.9rem;line-height:1.78}
.prose ul,.prose ol{margin:0 0 1rem 0;display:flex;flex-direction:column;gap:.45rem}
.prose li{padding-left:1.2rem;position:relative;color:var(--text-soft);line-height:1.7}
.prose ul li::before{content:"";position:absolute;left:.1rem;top:.68em;width:5px;height:5px;
  border-radius:50%;background:var(--brand)}
.prose ol{counter-reset:n}
.prose ol li{counter-increment:n}
.prose ol li::before{content:counter(n) ".";position:absolute;left:0;color:var(--brand-hi);
  font-family:var(--f-mono);font-size:.82em;top:.1em}
.prose code{font-family:var(--f-mono);font-size:.85em;background:var(--surface-hi);
  padding:.12rem .38rem;border-radius:5px;color:var(--cyan);border:1px solid var(--line)}
.prose pre{background:var(--bg-elev-2);border:1px solid var(--line);border-radius:var(--r-md);
  padding:1rem 1.1rem;overflow-x:auto;margin-bottom:1.1rem;position:relative}
.prose pre code{background:none;border:0;padding:0;color:var(--text-soft);font-size:.8rem;line-height:1.8}
.prose blockquote{border-left:2px solid var(--brand);padding:.3rem 0 .3rem 1.1rem;
  margin-bottom:1rem;color:var(--text-soft);font-style:italic}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:2px}
.copy-btn{position:absolute;top:.5rem;right:.5rem;padding:.25rem .55rem;border-radius:6px;
  border:1px solid var(--line);background:var(--bg-elev);font-size:.66rem;color:var(--text-dim);
  opacity:0;transition:all var(--d-fast)}
.prose pre:hover .copy-btn{opacity:1}
.copy-btn:hover{color:var(--text);border-color:var(--line-hi)}

.callout{display:flex;gap:.8rem;padding:1rem 1.1rem;border-radius:var(--r-md);margin-bottom:1.1rem;
  border:1px solid rgba(34,211,238,.3);background:rgba(34,211,238,.07)}
.callout .i{flex:none;width:20px;height:20px;color:var(--cyan)}
.callout p{margin:0;font-size:var(--t-sm)}
.callout.warn{border-color:rgba(251,191,36,.32);background:rgba(251,191,36,.07)}
.callout.warn .i{color:var(--amber)}
.callout.tip{border-color:rgba(163,230,53,.3);background:rgba(163,230,53,.06)}
.callout.tip .i{color:var(--lime)}

/* ---------- QUIZ ---------- */
.quiz-opt{display:flex;align-items:center;gap:.7rem;padding:.75rem .95rem;border-radius:var(--r-md);
  border:1px solid var(--line);background:var(--surface);cursor:pointer;width:100%;text-align:left;
  font-size:var(--t-sm);transition:all var(--d-fast);margin-bottom:.5rem}
.quiz-opt:hover{border-color:var(--line-hi);background:var(--surface-hi)}
.quiz-opt .k{width:24px;height:24px;border-radius:7px;border:1px solid var(--line-hi);flex:none;
  display:grid;place-items:center;font-family:var(--f-mono);font-size:.7rem;color:var(--text-dim)}
.quiz-opt.correct{border-color:rgba(163,230,53,.6);background:rgba(163,230,53,.12)}
.quiz-opt.correct .k{background:var(--lime);border-color:var(--lime);color:#07070b}
.quiz-opt.wrong{border-color:rgba(251,113,133,.55);background:rgba(251,113,133,.1)}
.quiz-opt.wrong .k{background:var(--rose);border-color:var(--rose);color:#fff}

/* ---------- MODAL ---------- */
.modal{position:fixed;inset:0;z-index:980;display:grid;place-items:center;padding:1rem;
  background:rgba(4,4,8,.72);backdrop-filter:blur(8px);
  opacity:0;pointer-events:none;transition:opacity var(--d)}
.modal.open{opacity:1;pointer-events:auto}
.modal-box{width:min(460px,100%);background:var(--bg-elev);border:1px solid var(--line-hi);
  border-radius:var(--r-xl);padding:clamp(1.5rem,4vw,2.2rem);box-shadow:var(--sh-lg);
  transform:translateY(16px) scale(.97);transition:transform var(--d) var(--e-out);
  max-height:90dvh;overflow-y:auto}
.modal.open .modal-box{transform:none}
.modal-x{position:absolute;top:1rem;right:1rem;width:32px;height:32px;border-radius:50%;
  display:grid;place-items:center;color:var(--text-dim);transition:all var(--d-fast)}
.modal-x:hover{color:var(--text);background:var(--surface-hi)}

/* ---------- TOAST ---------- */
.toasts{position:fixed;bottom:1.2rem;left:50%;transform:translateX(-50%);z-index:990;
  display:flex;flex-direction:column;gap:.5rem;align-items:center;pointer-events:none}
.toast{display:flex;align-items:center;gap:.6rem;padding:.7rem 1.1rem;border-radius:var(--r-full);
  background:var(--bg-elev);border:1px solid var(--line-hi);box-shadow:var(--sh-md);
  font-size:var(--t-sm);animation:toastIn .35s var(--e-out)}
.toast.ok{border-color:rgba(163,230,53,.45)} .toast.ok .ic{color:var(--lime)}
.toast.err{border-color:rgba(251,113,133,.45)} .toast.err .ic{color:var(--rose)}
.toast .ic{width:17px;height:17px;flex:none;color:var(--brand-hi)}
@keyframes toastIn{from{opacity:0;transform:translateY(16px)}}
.toast.out{animation:toastOut .3s var(--e-out) forwards}
@keyframes toastOut{to{opacity:0;transform:translateY(10px)}}

/* ---------- PAGE HEADER ---------- */
.page-head{position:relative;padding-top:calc(var(--nav-h) + clamp(3rem,7vw,5.5rem));
  padding-bottom:clamp(2rem,5vw,4rem);overflow:hidden}
.crumbs{display:flex;align-items:center;gap:.45rem;font-size:var(--t-xs);
  color:var(--text-dim);margin-bottom:var(--sp-4)}
.crumbs a{display:inline-flex;align-items:center;min-height:24px}
.crumbs a:hover{color:var(--text)}
.crumbs span{opacity:.5}

/* ---------- MISC ---------- */
.divider{height:1px;background:var(--line);border:0}
.sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip{position:absolute;left:-9999px;top:0;z-index:999;padding:.7rem 1.2rem;
  background:var(--brand);color:#fff;border-radius:0 0 10px 0}
.skip:focus{left:0}
.hidden{display:none!important}
.mt-0{margin-top:0} .mt-4{margin-top:var(--sp-4)} .mt-5{margin-top:var(--sp-5)}
.mt-6{margin-top:var(--sp-6)} .mb-4{margin-bottom:var(--sp-4)} .mb-5{margin-bottom:var(--sp-5)}
.w-full{width:100%}

.spinner{width:16px;height:16px;border:2px solid var(--line-hi);border-top-color:var(--brand);
  border-radius:50%;animation:spin .7s linear infinite;flex:none}
@keyframes spin{to{transform:rotate(360deg)}}

#course-root:empty{min-height:100vh}
#dash-root:empty{min-height:60vh}
#c-grid:empty{min-height:40vh}
#lab-panels:empty{min-height:80vh}
#lab-nav:empty{min-height:300px}
.label-caps{font-family:var(--f-mono);font-size:var(--t-xs);text-transform:uppercase;letter-spacing:.11em;
  color:var(--text-dim);font-weight:500;margin-bottom:0}
/* ---------- PAYMENT MODAL ---------- */
.pay-box{width:min(480px,100%);position:relative}
.pay-steps{display:flex;gap:.4rem;margin:1.1rem 0 1.2rem;counter-reset:s}
.pay-steps li{flex:1;display:flex;align-items:center;gap:.45rem;font-size:var(--t-xs);color:var(--text-dim);
  padding-bottom:.55rem;border-bottom:2px solid var(--line)}
.pay-steps li span{width:22px;height:22px;border-radius:50%;display:grid;place-items:center;flex:none;
  border:1px solid var(--line-hi);font-family:var(--f-mono);font-size:.68rem}
.pay-steps li span svg{width:12px;height:12px}
.pay-steps li.on{color:var(--text);border-bottom-color:var(--brand)}
.pay-steps li.on span{background:var(--brand);border-color:var(--brand);color:#fff}
.pay-steps li.done{color:var(--text-soft);border-bottom-color:rgba(163,230,53,.6)}
.pay-steps li.done span{background:var(--lime);border-color:var(--lime);color:#07070b}
.pay-sum{display:flex;align-items:center;gap:.8rem;padding:.8rem .9rem;border:1px solid var(--line);
  border-radius:var(--r-md);background:var(--surface)}
.pay-sum-ico{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;flex:none;
  color:#fff;font-family:var(--f-display);font-weight:700;font-size:.78rem;letter-spacing:-.02em}
.pay-sum-ico svg{width:22px;height:22px}
.pay-sum b{display:block;font-size:var(--t-sm)}
.pay-sum span{display:block;font-size:var(--t-xs);color:var(--text-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pay-amt{font-family:var(--f-display);font-size:var(--t-xl)!important;letter-spacing:-.03em;flex:none}
.pay-qr{display:grid;grid-template-columns:240px 1fr;gap:1.4rem;align-items:center}
.pay-qr > *{min-width:0}
.pay-qr-img{background:#fff;border-radius:var(--r-md);padding:8px;border:1px solid var(--line);aspect-ratio:1}
.pay-qr-img svg,.pay-qr-img img{width:100%;height:100%;display:block}
/* the owner's own QR card (a tall PhonePe/GPay poster) keeps its proportions */
.pay-qr-img.poster{aspect-ratio:auto;padding:0;background:#0b0b0b;overflow:hidden;align-self:start}
.pay-qr-img.poster img{height:auto}
.pay-phone{padding:1rem 1.1rem;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface)}
.pay-dl{display:flex;flex-direction:column;gap:.45rem;margin-top:.8rem}
.pay-dl div{display:flex;justify-content:space-between;align-items:center;gap:.6rem;font-size:var(--t-sm);
  padding-bottom:.4rem;border-bottom:1px dashed var(--line)}
.pay-dl dt{color:var(--text-dim)}
.pay-dl dd{display:flex;align-items:center;gap:.3rem;min-width:0;text-align:right;word-break:break-all}
.pay-copy{width:26px;height:26px;border-radius:7px;display:grid;place-items:center;color:var(--text-dim);flex:none}
.pay-copy:hover{background:var(--surface-hi);color:var(--text)}
.pay-copy svg{width:14px;height:14px}
.pay-note{text-align:center;font-size:var(--t-xs);color:var(--text-dim);margin-top:1rem}
.pay-ok{width:64px;height:64px;border-radius:50%;margin:0 auto;display:grid;place-items:center;
  background:rgba(163,230,53,.14);border:1px solid rgba(163,230,53,.45);color:var(--lime)}
.pay-ok svg{width:30px;height:30px}
@media(max-width:520px){.pay-qr{grid-template-columns:1fr}.pay-qr-img{max-width:240px;margin:0 auto;width:100%}}

/* ---------- CERTIFICATE PAGE ---------- */
.cert-status{display:flex;gap:.9rem;align-items:flex-start;padding:1rem 1.15rem;border-radius:var(--r-md);border:1px solid}
.cert-status b{display:block;font-family:var(--f-display);font-size:var(--t-lg);letter-spacing:-.02em}
.cert-status span:not(.cert-ico){display:block;font-size:var(--t-sm);color:var(--text-soft);margin-top:.15rem}
.cert-ico{width:34px;height:34px;border-radius:50%;display:grid;place-items:center;flex:none}
.cert-ico svg{width:18px;height:18px}
.cert-status.ok{border-color:rgba(163,230,53,.45);background:rgba(163,230,53,.08)}
.cert-status.ok .cert-ico{background:var(--lime);color:#07070b}
.cert-status.warn{border-color:rgba(251,191,36,.45);background:rgba(251,191,36,.08)}
.cert-status.warn .cert-ico{background:var(--amber);color:#07070b}
.cert-status.bad{border-color:rgba(251,113,133,.5);background:rgba(251,113,133,.08)}
.cert-status.bad .cert-ico{background:var(--rose);color:#fff}
.cert-stage{position:relative;border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--sh-lg);background:#f5f0e4;aspect-ratio:2970/2100}
.cert-stage canvas{display:block;width:100%;height:100%}
.cert-loading{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;gap:.6rem;
  color:#5b6078;font-size:var(--t-sm)}
.cert-dl{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:.9rem 1.5rem}
.cert-dl div{border-bottom:1px solid var(--line);padding-bottom:.6rem}
.cert-dl dt{font-size:var(--t-xs);color:var(--text-dim);text-transform:uppercase;letter-spacing:.09em;font-family:var(--f-mono)}
.cert-dl dd{font-size:var(--t-sm);margin-top:.2rem;word-break:break-word}

/* ---------- COURSE PURCHASE / COMPLETION BANNERS ---------- */
.cert-cta{display:flex;align-items:center;gap:1.1rem;flex-wrap:wrap;padding:1.2rem 1.3rem;border-radius:var(--r-lg);
  border:1px solid rgba(184,137,43,.45);background:linear-gradient(120deg,rgba(230,196,114,.14),rgba(13,148,136,.08))}
.cert-cta .medal{width:52px;height:52px;border-radius:50%;flex:none;display:grid;place-items:center;
  background:radial-gradient(circle at 35% 30%,#e6c472,#b8892b 70%,#8a6418);color:#fffaf0;
  box-shadow:0 8px 24px -10px rgba(184,137,43,.8)}
.cert-cta .medal svg{width:26px;height:26px}
.cert-cta h3{font-size:var(--t-lg)}
.cert-cta p{font-size:var(--t-sm);margin-top:.15rem}
.owned{display:inline-flex;align-items:center;gap:.35rem}
/* The lesson reader: curriculum beside the lesson on a desktop.
   The width used to be an inline style, which beat every media query — on a
   390px phone the sidebar took 320px and the lesson was left with 14. */
.lesson-grid{display:grid;grid-template-columns:320px 1fr;gap:clamp(1.5rem,3vw,2.5rem);align-items:start}
.lesson-grid > *{min-width:0}
/* The sidebar must span the whole row, or the sticky card inside it has
   nowhere to travel: align-items:start shrinks the column to the card's own
   height, the card's containing block becomes exactly itself, and it scrolls
   away with the page instead of following it. */
.lesson-grid > aside{align-self:stretch}
/* A lesson page lays out the whole curriculum and the whole lesson at once,
   which on a throttled phone cost about two seconds of style and layout.
   content-visibility lets the browser skip the parts that are off screen
   until they are scrolled to; the intrinsic size keeps the scrollbar from
   jumping as they come into view. */
#curriculum > div{content-visibility:auto;contain-intrinsic-size:auto 320px}
#lesson-article > section,#lesson-article > .prose > *{content-visibility:auto;contain-intrinsic-size:auto 200px}
.curriculum-card{
  padding:1rem; position:sticky; top:calc(var(--nav-h) + 1.2rem);
  max-height:calc(100dvh - var(--nav-h) - 3rem); overflow-y:auto;
}
@media(max-width:900px){
  /* One column, and the lesson comes first. Reading is why you opened the
     page; Previous/Next at the end of the lesson carry you through the
     course, so the full list belongs below as a contents page. */
  .lesson-grid{grid-template-columns:1fr}
  .lesson-grid > aside{order:2}
  .lesson-grid > #pane{order:1}
  .curriculum-card{position:static;max-height:none}
}

/* ---------- owner desk: the payment queue ---------- */
/* The rewritten prompt. Monospace and wrapped, so the user can see exactly
   what they are about to paste, line breaks and all. */
.prompt-out{
  white-space:pre-wrap; word-break:break-word; margin:0;
  font-family:var(--f-mono); font-size:.82rem; line-height:1.65; color:var(--text);
  background:var(--surface-2); border:1px solid var(--line);
  border-radius:var(--r-m); padding:.9rem 1rem; max-height:420px; overflow:auto;
}

.order-list{display:grid;gap:1rem}
@media(min-width:900px){.order-list{grid-template-columns:repeat(2,1fr)}}
.order-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:.6rem 1rem;margin:0}
.order-meta dt{font-size:var(--t-xs);text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim)}
.order-meta dd{margin:.1rem 0 0;font-size:var(--t-sm);word-break:break-word}
/* The screenshot is evidence, so it opens full size; the thumbnail is capped
   so one tall phone screenshot cannot push the buttons off the card. */
.order-shot{display:block;max-height:260px;overflow:hidden;border-radius:var(--r-m);
  border:1px solid var(--line);background:var(--surface-2)}
.order-shot img{width:100%;height:auto;object-fit:cover}
.order-result{margin:.7rem 0 0;font-size:var(--t-sm);min-height:0}
.order-result.ok{color:var(--lime)}
.order-result.bad{color:var(--rose)}

.dash-row{display:flex;align-items:center;gap:.9rem;flex-wrap:wrap;padding:.9rem 1.1rem;border-bottom:1px solid var(--line)}
.dash-row:last-child{border-bottom:0}
.dash-row-t{flex:1;min-width:200px;font-size:var(--t-sm);font-weight:550}
.dash-row-t small{display:block;font-weight:400;color:var(--text-dim);font-size:var(--t-xs);margin-top:.1rem}
.admin-log{width:100%;border-collapse:collapse;min-width:640px;font-size:var(--t-sm)}
.admin-log th{text-align:left;font-family:var(--f-mono);font-size:var(--t-xs);font-weight:500;text-transform:uppercase;
  letter-spacing:.08em;color:var(--text-dim);padding:.5rem .6rem;border-bottom:1px solid var(--line)}
.admin-log td{padding:.55rem .6rem;border-bottom:1px solid var(--line);vertical-align:middle}

/* ---------- LESSON VIDEO ---------- */
.vid{border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--bg-elev)}
.vid-tabs{display:flex;gap:.25rem;padding:.45rem;border-bottom:1px solid var(--line);background:var(--bg-elev-2)}
.vid-tabs button{padding:.4rem .95rem;border-radius:var(--r-full);font-size:var(--t-sm);color:var(--text-soft);
  border:1px solid transparent;transition:all var(--d-fast)}
.vid-tabs button:hover{color:var(--text);background:var(--surface)}
.vid-tabs button[aria-selected="true"]{background:var(--text);color:var(--bg);font-weight:600}
.vid-frame{position:relative;aspect-ratio:16/9;background:#000}
.vid-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.vid-facade{position:absolute;inset:0;width:100%;height:100%;padding:0;display:block;cursor:pointer;overflow:hidden}
.vid-facade img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--e-out),filter .3s}
.vid-facade:hover img{transform:scale(1.03);filter:brightness(.85)}
.vid-facade::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,.45),transparent 30%,transparent 65%,rgba(0,0,0,.55))}
.vid-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);z-index:2;width:76px;height:76px;border-radius:50%;
  display:grid;place-items:center;background:var(--brand);color:#fff;box-shadow:0 14px 40px -10px rgba(13,148,136,.9);
  transition:transform var(--d) var(--e-out)}
.vid-play svg{width:28px;height:28px;margin-left:4px;fill:currentColor}
.vid-facade:hover .vid-play,.vid-facade:focus-visible .vid-play{transform:translate(-50%,-50%) scale(1.08)}
.vid-title{position:absolute;left:1rem;right:1rem;top:.9rem;z-index:2;color:#fff;font-weight:600;font-size:var(--t-sm);
  text-align:left;text-shadow:0 1px 6px rgba(0,0,0,.6);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
/* Shown instead of the language tabs when only one language has a video
   worth recommending. Quiet, but it answers the obvious question. */
.vid-only{
  margin:0; padding:.6rem .85rem;
  font-size:.82rem; line-height:1.5; color:var(--muted);
  background:var(--surface-2); border:1px solid var(--line);
  border-bottom:0; border-radius:var(--r-m) var(--r-m) 0 0;
}
.vid-credit{display:flex;justify-content:space-between;align-items:center;gap:.8rem;flex-wrap:wrap;padding:.65rem .95rem;
  font-size:var(--t-xs);color:var(--text-dim)}
.vid-credit a{display:inline-flex;align-items:center;gap:.3rem;min-height:24px}
.vid-credit a{display:inline-flex;align-items:center;gap:.3rem;color:var(--text-soft);text-decoration:none}
.vid-credit a:hover{color:var(--text)}
.vid-credit svg{width:13px;height:13px}
.linkish{color:var(--cyan);text-decoration:underline;text-underline-offset:2px;font-size:inherit;padding:0}

/* ---------- PAYMENT PAGE ---------- */
.pay-wrap{max-width:720px;margin-inline:auto}
.pay-card{padding:clamp(1.2rem,3vw,2rem)}
.pay-big{font-size:var(--t-lg);color:var(--text)}
.pay-big b{font-family:var(--f-display);font-size:var(--t-2xl);letter-spacing:-.03em}
.pay-qr-missing{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.5rem;
  color:#5b6078;font-size:var(--t-sm);text-align:center}
.pay-qr-missing svg{width:42px;height:42px;opacity:.5}
.pay-howto{counter-reset:h;margin-top:1rem;display:flex;flex-direction:column;gap:.45rem}
.pay-howto li{counter-increment:h;position:relative;padding-left:1.8rem;font-size:var(--t-sm);color:var(--text-soft);line-height:1.55}
.pay-howto li::before{content:counter(h);position:absolute;left:0;top:.05rem;width:1.25rem;height:1.25rem;border-radius:50%;
  display:grid;place-items:center;background:var(--surface-hi);border:1px solid var(--line-hi);font-family:var(--f-mono);font-size:.66rem;color:var(--text)}
.pay-drop{display:flex;align-items:center;gap:.9rem;padding:1rem;border:1.5px dashed var(--line-hi);border-radius:var(--r-md);
  cursor:pointer;background:var(--surface);transition:border-color var(--d-fast),background var(--d-fast);position:relative;min-height:84px}
.pay-drop:hover{border-color:var(--brand);background:var(--surface-hi)}
#f-shot:focus-visible + .err-msg,#f-shot:focus-visible{outline:none}
.field:focus-within .pay-drop{border-color:var(--brand)}
.field.err .pay-drop{border-color:var(--rose)}
.pay-drop-ico{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;flex:none;background:var(--surface-hi);color:var(--brand-hi)}
.pay-drop-ico svg{width:22px;height:22px}
.pay-drop b{display:block;font-size:var(--t-sm)}
.pay-drop small{display:block;font-size:var(--t-xs);color:var(--text-dim)}
.pay-drop img{margin-left:auto;width:64px;height:84px;object-fit:cover;border-radius:8px;border:1px solid var(--line);flex:none}
.pay-drop.has-img{border-style:solid;border-color:rgba(163,230,53,.5)}
.pay-preview{font-size:var(--t-sm);margin:-.3rem 0 1rem;color:var(--text-soft)}
.pay-consent{display:flex;gap:.6rem;align-items:flex-start;font-size:var(--t-sm);cursor:pointer;margin-top:.4rem}
.pay-consent input{width:18px;height:18px;margin-top:.15rem;accent-color:var(--brand);flex:none}
#pay-root:empty,#cert-root:empty{min-height:70vh}

.empty{text-align:center;padding:clamp(2.5rem,6vw,4.5rem) 1rem;color:var(--text-dim)}
.empty svg{width:44px;height:44px;margin:0 auto 1rem;opacity:.35}

/* The sign-in ask on the tool pages. A panel over the page, not a redirect:
   a visitor should still be able to see what they are signing in for. */
.gate{
  position:fixed;inset:0;z-index:950;display:grid;place-items:center;padding:1rem;
  background:rgba(0,0,0,.55);backdrop-filter:blur(3px);
}
.gate-card{
  background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.1rem,3vw,1.8rem);max-width:30rem;width:100%;
  box-shadow:0 24px 60px rgba(0,0,0,.4);
}

/* The owner desk: payments, accounts, prices, activity. */
.desk-nav{display:flex;flex-wrap:wrap;gap:.4rem;margin-bottom:1rem;border-bottom:1px solid var(--line);padding-bottom:.6rem}
.desk-nav button{
  appearance:none;cursor:pointer;background:none;border:1px solid transparent;color:var(--text-dim);
  padding:.35rem .8rem;border-radius:99px;font-size:var(--t-sm);
}
.desk-nav button:hover{color:var(--text)}
.desk-nav button.on{background:var(--brand);border-color:var(--brand);color:#fff}
.acct{border:1px solid var(--line);border-radius:var(--r-m);padding:.9rem 1rem;margin-bottom:.7rem;background:var(--surface-2)}
.acct-out{margin-top:.6rem;font-size:var(--t-sm)}
.acct-out:empty{display:none}
.record .row,.log .row{font-size:var(--t-xs);color:var(--text-soft);margin:.25rem 0;display:flex;gap:.4rem;flex-wrap:wrap;align-items:center}
.log{max-height:560px;overflow:auto}
.price-form{border-top:1px dashed var(--line);padding-top:.8rem;margin-top:.6rem}
.price-msg{margin-top:.6rem;font-size:var(--t-sm)}
.price-msg.ok{color:var(--lime)} .price-msg.bad{color:var(--rose)}
.pill-rose{background:rgba(244,63,94,.16);color:var(--rose);border-color:rgba(244,63,94,.3)}

/* The database section of the owner desk. A table of live rows has to
   scroll sideways on a phone without taking the page with it. */
.db-tabs{display:flex;flex-wrap:wrap;gap:.35rem}
.db-tabs button{
  appearance:none;cursor:pointer;background:var(--surface-2);border:1px solid var(--line);
  color:var(--text-soft);border-radius:99px;padding:.25rem .7rem;font-size:var(--t-xs);font-family:var(--f-mono);
}
.db-tabs button span{opacity:.6;margin-left:.3rem}
.db-tabs button:hover{border-color:var(--brand);color:var(--text)}
.db-tabs button.on{background:var(--brand);border-color:var(--brand);color:#fff}
.db-tabs button.on span{opacity:.85}
.db-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-m);max-height:460px;overflow-y:auto}
.db-table{border-collapse:collapse;width:100%;font-size:var(--t-xs);font-family:var(--f-mono)}
.db-table th{
  position:sticky;top:0;background:var(--bg-elev-2);text-align:left;white-space:nowrap;
  padding:.45rem .6rem;border-bottom:1px solid var(--line);font-weight:600;
}
.db-table td{padding:.4rem .6rem;border-bottom:1px solid var(--line);vertical-align:top;max-width:28ch;
  overflow-wrap:anywhere}
.db-table tr:hover td{background:var(--surface-2)}
.db-table .null{color:var(--text-dim);font-style:italic}

/* The one sign-in page. One narrow column, nothing else competing with
   it — a person here is doing one thing. */
/* Tall enough that the footer lands at the bottom of the window instead
   of halfway down with a blank band beneath it. */
.auth-section{min-height:calc(100dvh - var(--nav-h) - 7rem);display:grid;place-items:center;
  padding-block:clamp(2rem,6vw,4rem)}
.auth-card{
  width:100%;max-width:26rem;margin-inline:auto;
  background:var(--bg-elev);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.3rem,4vw,2rem);box-shadow:0 18px 50px rgba(0,0,0,.22);
}
/* The heading used to sit directly on top of the first label. */
.auth-card > h1{margin-bottom:1.5rem}
.auth-card > h1 + .auth-note{margin-top:-1.1rem;margin-bottom:1.5rem}
.auth-note{margin-top:.7rem;font-size:var(--t-sm);color:var(--text-soft);line-height:1.6}
.auth-who{margin-top:.7rem;font-size:var(--t-sm);color:var(--text-soft);word-break:break-word}
.auth-aside{margin-top:1.1rem;font-size:var(--t-xs);color:var(--text-dim);line-height:1.6}
.auth-err{margin-top:.9rem}
.auth-code{letter-spacing:.5em;text-align:center;font-size:1.3rem;padding-left:.5em}
.btn-block{width:100%;justify-content:center}
.linkish{
  appearance:none;background:none;border:0;padding:0;cursor:pointer;
  color:var(--brand-hi);text-decoration:underline;font:inherit;
}

.account-card{max-width:34rem}
.account-rule{border:0;border-top:1px solid var(--line);margin:1.6rem 0 1.2rem}
.account-list{margin:.6rem 0 0;padding-left:1.1rem;font-size:var(--t-sm);color:var(--text-soft);line-height:1.8}
.save-note{margin-left:.6rem;font-size:var(--t-xs);font-family:var(--f-mono)}
.save-note.ok{color:var(--lime)} .save-note.bad{color:var(--rose)}

/* Where the repeated sections used to be: one quiet line instead of three
   more screens of the same thing. */
.onward{margin-top:1.4rem;font-size:var(--t-sm);color:var(--text-dim)}
.onward a{color:var(--text-soft);text-decoration:underline;text-underline-offset:3px}
.onward a:hover{color:var(--brand-hi)}

/* A price on sale: the old figure struck through, the new one bold, and
   the saving spelled out. The struck-through number is the catalogue
   price, never an invented "was". */
.price-sale{display:inline-flex;align-items:baseline;gap:.4rem;flex-wrap:wrap}
.price-was{color:var(--text-dim);font-weight:400;text-decoration-thickness:1px}
.price-sale b{color:var(--text);font-weight:650}
.price-off{
  font-size:.68rem;font-weight:600;letter-spacing:.02em;
  background:rgba(13,148,136,.16);color:var(--brand-hi);
  border:1px solid rgba(13,148,136,.3);border-radius:99px;padding:.1rem .45rem;
}
/* The strip that says a sale is on. Quiet: it sits above the page, not
   across it, and it never covers anything. */
.sale-strip{
  display:flex;flex-wrap:wrap;gap:.5rem;align-items:center;justify-content:center;
  background:var(--bg-elev);border-bottom:1px solid var(--line);
  padding:.5rem 1rem;font-size:var(--t-sm);text-align:center;
}
.sale-strip b{color:var(--brand-hi)}
.sale-strip a{color:var(--text);text-decoration:underline;text-underline-offset:3px}