/* Course experience (dark platform theme): dashboard, timeline, lesson cards, player, tabs, exercises. Uses the tokens in brand.css. */

/* ——— Lesson header and stepper ——— */
.lesson-hero{padding:.25rem 0 1.25rem}
.lesson-hero h1{margin:.5rem 0 .5rem;font-size:clamp(1.65rem,3.6vw,2.5rem);line-height:1.1;letter-spacing:-.04em}
.lesson-hero .lead{margin:0 0 .7rem;color:var(--ink-muted);max-width:46rem;font-size:1.05rem}
.lesson-hero .meta{display:flex;flex-wrap:wrap;gap:.45rem;align-items:center}
.lesson-nav{display:flex;gap:.4rem;flex-wrap:wrap;padding:.35rem;border:1px solid var(--border);border-radius:999px;background:rgba(5,10,54,.55);backdrop-filter:blur(10px);width:fit-content;max-width:100%}
.lesson-nav a{display:inline-flex;align-items:center;justify-content:center;min-width:2.5rem;padding:.38rem .7rem;border-radius:999px;font-family:var(--mono);font-size:.82rem;font-weight:500;color:var(--ink-muted);text-decoration:none;transition:background .2s,color .2s}
.lesson-nav a:hover{background:rgba(255,255,255,.1);color:#fff}
.lesson-nav a.current{background:var(--grad);color:#fff;box-shadow:0 6px 18px -8px rgba(115,0,245,.9)}
.lesson-nav a.done{color:var(--teal-300)}
.lesson-nav a.done.current{color:#fff}
.lesson-nav a.locked::after{content:"";width:.7em;height:.7em;margin-left:.35em;opacity:.6;background:currentColor;-webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M17 9V7a5 5 0 0 0-10 0v2H5v12h14V9zm-8 0V7a3 3 0 0 1 6 0v2z'/%3E%3C/svg%3E") center/contain no-repeat;mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M17 9V7a5 5 0 0 0-10 0v2H5v12h14V9zm-8 0V7a3 3 0 0 1 6 0v2z'/%3E%3C/svg%3E") center/contain no-repeat}
.lesson-nav a.done::after{content:" ✓";margin-left:.2em}

.progress{display:flex;align-items:center;gap:.7rem;font-weight:500;color:var(--ink-muted);font-size:.88rem;font-family:var(--mono)}
.progress-bar{width:7.5rem;height:.45rem;border-radius:99px;background:rgba(255,255,255,.12);overflow:hidden}
.progress-bar>span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--electric-indigo),var(--blue-300));box-shadow:0 0 12px rgba(115,0,245,.8);transition:width .5s ease;border-radius:inherit}

/* ——— Video player ——— */
.video-shell{position:relative;aspect-ratio:16/9;background:var(--dark-blue);border-radius:var(--radius);overflow:hidden;border:1px solid rgba(160,130,255,.3);box-shadow:0 40px 90px -35px rgba(0,0,0,.9),0 0 70px -25px rgba(115,0,245,.7)}
.video-shell video{position:absolute;inset:0;width:100%;height:100%;background:#000;object-fit:contain}
.video-start{position:absolute;inset:0;width:100%;display:grid;place-content:end start;justify-items:start;gap:.6rem;padding:1.5rem 1.75rem;text-align:left;border:0;cursor:pointer;color:#fff;font:inherit;font-weight:600;font-size:1rem;
  background:center/cover no-repeat var(--poster, none),linear-gradient(135deg,var(--dark-blue),var(--royal-blue))}
.video-start::before{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(5,10,54,.92) 0%,rgba(5,10,54,.35) 45%,rgba(5,10,54,.1) 100%);transition:opacity .25s}
.video-start:hover::before,.video-start:focus-visible::before{opacity:.8}
.video-start>*{position:relative}
.video-start .play{position:absolute;right:1.75rem;bottom:1.5rem;width:4.4rem;height:4.4rem;border-radius:50%;background:var(--grad);display:grid;place-items:center;box-shadow:0 0 0 8px rgba(115,0,245,.25),0 12px 34px rgba(115,0,245,.7),inset 0 1px 0 rgba(255,255,255,.4);transition:transform .25s}
.video-start:hover .play{transform:scale(1.08)}
.video-start .play::before{content:"";position:absolute;inset:-8px;border-radius:50%;border:1px solid rgba(160,130,255,.6);animation:ping 2.4s ease-out infinite}
@keyframes ping{from{transform:scale(.9);opacity:.9}to{transform:scale(1.5);opacity:0}}
.video-start .play::after{content:"";margin-left:.3rem;border-style:solid;border-width:.8rem 0 .8rem 1.3rem;border-color:transparent transparent transparent #fff}
.video-start[hidden],.video-shell video[hidden]{display:none}
.video-status{margin:.8rem 0 0;padding:.7rem 1rem;border-radius:12px;background:rgba(255,255,255,.06);border:1px solid var(--border);font-weight:500;color:var(--ink-muted)}
.video-status[hidden]{display:none}
.video-status.error{border-color:rgba(255,120,120,.6);color:#ffd3cc;background:rgba(160,40,27,.25)}
.video-meta{margin:.7rem 0 0;color:var(--ink-faint);font-size:.88rem}
.video-actions{display:flex;flex-wrap:wrap;gap:.6rem;margin:1.1rem 0 0}

/* Complete bar */
.complete-bar{display:flex;flex-wrap:wrap;gap:.7rem 1rem;align-items:center;justify-content:space-between;margin-top:1.75rem;padding:1.05rem 1.25rem}
.complete-bar .actions{display:flex;flex-wrap:wrap;gap:.6rem;align-items:center}
.complete-bar .form-note{margin:0}
.link-btn{appearance:none;border:0;background:none;font:inherit;font-weight:500;color:var(--indigo-300);text-decoration:underline;cursor:pointer;padding:0}
.link-btn:hover{color:#fff}

/* Text rendered into the lesson and coach tabs */
#lesson-body,#lesson-coach{font-size:1.04rem;max-width:44rem}
#lesson-body h3,#lesson-coach h3{margin:1.8rem 0 .6rem;font-size:1.25rem}
#lesson-body h4,#lesson-coach h4{margin:1.4rem 0 .4rem;font-size:1.05rem;color:var(--blue-300);font-family:var(--mono);font-weight:500;letter-spacing:.06em;text-transform:uppercase;font-size:.82rem}
#lesson-body p,#lesson-coach p,#lesson-body li,#lesson-coach li{color:#dadefa;line-height:1.75}
#lesson-body ul,#lesson-coach ul,#lesson-body ol,#lesson-coach ol{padding-left:1.25rem}
#lesson-body li::marker,#lesson-coach li::marker{color:var(--indigo-300)}
#lesson-body table,#lesson-coach table{display:block;overflow-x:auto;max-width:100%;border-collapse:collapse;margin:1rem 0}
#lesson-body th,#lesson-body td,#lesson-coach th,#lesson-coach td{padding:.5rem .7rem;border:1px solid var(--border);text-align:left;font-size:.93rem}
#lesson-body th,#lesson-coach th{background:rgba(255,255,255,.06)}
#lesson-body pre,#lesson-coach pre,#lesson-body code{font-family:var(--mono);font-size:.9em}
#lesson-body pre,#lesson-coach pre{white-space:pre-wrap;word-break:break-word;padding:1rem;border-radius:12px;background:rgba(5,10,54,.7);border:1px solid var(--border)}
#lesson-body blockquote,#lesson-coach blockquote{margin:1rem 0;padding:.4rem 1rem;border-left:3px solid var(--electric-indigo);background:rgba(115,0,245,.08);border-radius:0 12px 12px 0}
.tab-panel h2{font-size:1.5rem}

/* ——— Exercises ——— */
.ex-intro{margin:0 0 1.1rem;color:var(--ink-muted)}
.ex-step{padding:1.3rem 1.4rem;margin:0 0 1.1rem;border-radius:var(--radius)}
.ex-step.is-done{border-color:rgba(63,224,197,.5);box-shadow:var(--glow),0 0 40px -22px rgba(0,171,148,.9),inset 0 1px 0 rgba(255,255,255,.07)}
.ex-head{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:space-between;align-items:baseline}
.ex-step h3{margin:0 0 .4rem;font-size:1.15rem}
.ex-step .kind{font-family:var(--mono);font-size:.7rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--blue-300)}
.ex-learning{margin:.2rem 0 .6rem;font-weight:500;color:var(--indigo-300)}
.ex-step p{margin:.45rem 0;color:#dadefa}
.ex-label{display:block;margin:1rem 0 .3rem;font-weight:500;font-size:.93rem;color:#fff}
.ex-step textarea,.ex-step input[type=text]{width:100%;font:inherit;padding:.7rem .8rem;border:1px solid var(--border-strong);border-radius:12px;background:rgba(5,10,54,.65);color:var(--ink);resize:vertical;margin-bottom:0}
.ex-step textarea:focus,.ex-step input[type=text]:focus{outline:none;border-color:var(--indigo-300);box-shadow:0 0 0 3px rgba(115,0,245,.35)}
.prompt-box{position:relative;margin:.7rem 0;padding:.9rem 1.1rem;background:rgba(5,10,54,.7);border:1px solid rgba(160,130,255,.35);border-left:3px solid var(--electric-indigo);border-radius:12px}
.prompt-box .plabel{display:block;font-family:var(--mono);font-size:.68rem;font-weight:500;text-transform:uppercase;letter-spacing:.12em;color:var(--indigo-300);margin-bottom:.4rem}
.prompt-box pre{margin:0;white-space:pre-wrap;word-break:break-word;font-family:var(--mono);font-size:.86rem;line-height:1.6;color:#e6e8ff}
.prompt-box .copy{position:absolute;top:.55rem;right:.55rem;padding:.25rem .75rem;font-size:.78rem}
.ex-then{margin:.4rem 0 .4rem 1.1rem;padding:0;color:#dadefa}
.ex-output{margin:.8rem 0 0;padding:.6rem .9rem;border-radius:12px;background:var(--accent-soft);border:1px solid rgba(63,224,197,.3);font-size:.92rem;color:#d3fbf3}
.ex-table-wrap{overflow-x:auto;margin:.4rem 0;max-width:100%;-webkit-overflow-scrolling:touch}
.ex-table{width:100%;border-collapse:collapse;min-width:34rem}
.ex-table th{font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;text-align:left;padding:.35rem .4rem;color:var(--ink-faint);font-weight:500}
.ex-table td{padding:.25rem .3rem;vertical-align:top}
.ex-table td.rowlabel{font-weight:600;white-space:nowrap;padding-right:.7rem;color:#fff}
.ex-done{display:flex;gap:.6rem;align-items:center;margin-top:1.1rem;font-weight:500;font-size:1rem}
.ex-done input{width:1.2rem;height:1.2rem;accent-color:var(--dark-turquoise);margin:0}
.ex-checklist{list-style:none;margin:.5rem 0;padding:0}
.ex-checklist li{margin:.4rem 0}
.ex-checklist label{display:flex;gap:.6rem;align-items:flex-start;font-weight:500;font-size:1rem;margin:0}
.ex-checklist input{margin:.3rem 0 0;width:1.1rem;height:1.1rem;accent-color:var(--dark-turquoise)}
.ex-safety{font-size:.88rem;color:#ffe9c2;border-left:3px solid var(--yellow);padding:.5rem .9rem;background:rgba(255,186,66,.1);border-radius:0 12px 12px 0;margin:.2rem 0 1rem}
.save-state{position:sticky;bottom:.9rem;display:inline-block;margin:.5rem 0 0;padding:.35rem .9rem;border-radius:99px;background:var(--grad);color:#fff;font-size:.8rem;font-weight:500;font-family:var(--mono);box-shadow:0 10px 30px -10px rgba(115,0,245,.9)}
.save-state:empty{display:none}
.save-state.err{background:#a0281b}

/* ——— Course dashboard (courses.html) ——— */
.dash-hero{padding:3.2rem 0 2.6rem}
.dash-hero .hero-grid{grid-template-columns:1.1fr .9fr;gap:2.5rem}
@media(max-width:960px){.dash-hero .hero-grid{grid-template-columns:1fr}.dash-hero{padding:2.2rem 0 1.8rem}}
.dash-hero h1{font-size:clamp(2rem,4.4vw,3.2rem)}
.course-progress-card{display:block;margin:0;padding:1.35rem 1.4rem;border-color:rgba(160,130,255,.35);box-shadow:0 40px 90px -35px rgba(0,0,0,.85),0 0 70px -25px rgba(115,0,245,.6),inset 0 1px 0 rgba(255,255,255,.1)}
.course-progress-card .dash-top{display:flex;align-items:center;gap:1.1rem}
.course-progress-card .ring-wrap{--size:84px}
.course-progress-card h2{margin:0 0 .2rem;font-size:1.25rem;letter-spacing:-.02em}
.course-progress-card p{margin:0;color:var(--ink-muted)}
.course-progress-card .progress-bar{display:block;width:100%;height:.5rem;margin:1.1rem 0 .3rem}
.dash-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:.6rem;margin:1.1rem 0 1.2rem}
.dash-stats div{padding:.65rem .75rem;border-radius:12px;background:rgba(5,10,54,.55);border:1px solid var(--border)}
.dash-stats b{display:block;font-size:1.25rem;font-weight:600;color:#fff;letter-spacing:-.03em;line-height:1.1}
.dash-stats span{font-family:var(--mono);font-size:.66rem;text-transform:uppercase;letter-spacing:.1em;color:var(--ink-faint)}
.course-progress-card .btn{width:100%}

/* Timeline of lessons */
.path{padding:1.6rem 0 .4rem}
.timeline{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(8,minmax(0,1fr));gap:0;position:relative}
.timeline li{position:relative;padding-top:2.9rem;text-align:center}
.timeline li::before{content:"";position:absolute;top:1.2rem;left:0;right:0;height:2px;background:rgba(255,255,255,.14)}
.timeline li:first-child::before{left:50%}
.timeline li:last-child::before{right:50%}
.timeline li.free::before,.timeline li.done::before{background:linear-gradient(90deg,var(--electric-indigo),var(--blue-300))}
.timeline .node{position:absolute;top:.2rem;left:50%;transform:translateX(-50%);width:2.1rem;height:2.1rem;border-radius:50%;display:grid;place-items:center;font-family:var(--mono);font-size:.74rem;font-weight:600;color:#fff;background:var(--surface-solid);border:2px solid rgba(255,255,255,.24);z-index:1;transition:transform .2s,box-shadow .2s}
.timeline li.free .node{border-color:var(--blue-300);box-shadow:0 0 16px -2px rgba(70,199,234,.7)}
.timeline li.done .node{background:var(--dark-turquoise);border-color:var(--teal-300);color:#02201b}
.timeline a{display:block;text-decoration:none;color:var(--ink-muted);padding:0 .25rem}
.timeline a:hover .node,.timeline a:focus-visible .node{transform:translateX(-50%) scale(1.14);box-shadow:0 0 22px rgba(115,0,245,.9)}
.timeline .t{display:block;font-size:.8rem;font-weight:500;line-height:1.3;color:#fff}
.timeline .d{display:block;font-family:var(--mono);font-size:.68rem;color:var(--ink-faint);margin-top:.2rem}
.timeline li.free .d{color:var(--teal-300)}
.timeline-legend{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem;margin:1.1rem 0 0;font-family:var(--mono);font-size:.72rem;color:var(--ink-faint)}
.timeline-legend span::before{content:"";display:inline-block;width:.6rem;height:.6rem;border-radius:50%;margin-right:.45rem;border:2px solid rgba(255,255,255,.3)}
.timeline-legend .l-free::before{border-color:var(--blue-300);box-shadow:0 0 8px rgba(70,199,234,.7)}
.timeline-legend .l-done::before{background:var(--dark-turquoise);border-color:var(--teal-300)}
@media(max-width:760px){
  .timeline{grid-template-columns:1fr;gap:.2rem}
  .timeline li{padding:.35rem 0 .35rem 3.1rem;text-align:left}
  .timeline li::before{top:0;bottom:0;left:1.05rem;right:auto;width:2px;height:auto}
  .timeline li:first-child::before{top:50%;left:1.05rem}
  .timeline li:last-child::before{bottom:50%;right:auto}
  .timeline .node{top:50%;left:0;transform:translateY(-50%)}
  .timeline a:hover .node,.timeline a:focus-visible .node{transform:translateY(-50%) scale(1.1)}
  .timeline a{display:flex;align-items:baseline;gap:.7rem;flex-wrap:wrap}
  .timeline .d{margin:0}
}

/* Lesson cards with video thumbnails */
.lesson-cards{display:grid;gap:1.15rem;grid-template-columns:repeat(auto-fill,minmax(17rem,1fr));margin:1.2rem 0 2rem;padding:0;list-style:none}
.lesson-card{display:flex;flex-direction:column;overflow:hidden;transition:transform .25s ease,border-color .25s ease}
.lesson-card:hover{transform:translateY(-4px);border-color:rgba(160,130,255,.45)}
.lesson-card::before{content:"Lesson " attr(data-lesson);position:absolute;z-index:2;top:.75rem;left:.75rem;padding:.2rem .6rem;border-radius:999px;font-family:var(--mono);font-size:.68rem;font-weight:500;letter-spacing:.06em;text-transform:uppercase;color:#fff;background:rgba(5,10,54,.72);border:1px solid var(--border-strong);backdrop-filter:blur(8px)}
.lesson-card .thumb{position:relative;display:block;aspect-ratio:16/9;background:var(--dark-blue) center/cover no-repeat;border-bottom:1px solid var(--border)}
.lesson-card .thumb::before{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(5,10,54,.75),rgba(5,10,54,0) 60%)}
.lesson-card .thumb::after{content:"";position:absolute;right:.85rem;bottom:.8rem;width:2.5rem;height:2.5rem;border-radius:50%;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23fff' d='M9 6.5v11l9-5.5z'/%3E%3C/svg%3E") center/62% no-repeat,var(--grad);box-shadow:0 8px 22px -6px rgba(115,0,245,.9),inset 0 1px 0 rgba(255,255,255,.4);opacity:.95;transition:transform .25s}
.lesson-card:hover .thumb::after{transform:scale(1.12)}
.lesson-card .thumb{--tri:1}
.lesson-card .body{position:relative;padding:1.05rem 1.15rem 1.2rem;display:flex;flex-direction:column;gap:.5rem;flex:1}
.lesson-card h3{margin:0;font-size:1.08rem}
.lesson-card p{margin:0;color:var(--ink-muted);font-size:.92rem;flex:1}
.lesson-card .row{display:flex;flex-wrap:wrap;gap:.35rem;align-items:center}
.lesson-card .go{font-weight:600;text-decoration:none;color:var(--indigo-300)}
.lesson-card .go:hover{color:#fff}
.lesson-card.is-locked .thumb{filter:saturate(.55) brightness(.8)}
.lesson-card.is-locked .thumb::after{background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23fff' d='M17 9V7a5 5 0 0 0-10 0v2H5v12h14V9zm-8 0V7a3 3 0 0 1 6 0v2z'/%3E%3C/svg%3E") center/52% no-repeat,rgba(255,255,255,.2);box-shadow:none}
@media (prefers-reduced-motion:reduce){.progress-bar>span{transition:none}}

/* Phone fixes */
@media(max-width:560px){
  .lesson-nav{border-radius:18px}
  .tabs{display:flex;width:100%;overflow-x:auto;flex-wrap:nowrap;border-radius:16px}
  .tab{flex:1 0 auto;padding:.55rem .9rem}
  .video-start{padding:1rem 1.1rem}
  .video-start .play{width:3.4rem;height:3.4rem;right:1rem;bottom:1rem}
  .ex-step{padding:1.05rem 1rem}
  .dash-stats{grid-template-columns:repeat(3,1fr)}
}

/* The [hidden] attribute must always win over the display rules above. */
[hidden]{display:none!important}

@media(max-width:560px){
  .lesson-nav{flex-wrap:nowrap;overflow-x:auto;gap:.15rem;padding:.3rem;border-radius:999px;scrollbar-width:none;width:100%}
  .lesson-nav::-webkit-scrollbar{display:none}
  .lesson-nav a{min-width:2.1rem;padding:.35rem .5rem;flex:1 0 auto}
}