/* =========================================================
   DARK CODE — Course Platform styles
   Extends assets/css/style.css design tokens (--signal, --ink-*,
   --text-*, --f-display/body/mono, --r-*, .glass, .btn, .container)
   ========================================================= */

/* ---------- Courses hero ---------- */
.courses-hero{padding-top:56px;padding-bottom:20px;position:relative;}
.courses-hero .eyebrow{margin-bottom:14px;}
.courses-hero h1{
  font-family:var(--f-display);
  font-size:clamp(30px,4.4vw,50px);
  line-height:1.1;font-weight:600;letter-spacing:-.02em;
  max-width:760px;margin-bottom:16px;
}
.courses-hero p.lede{font-size:16px;color:var(--text-2);max-width:560px;margin-bottom:32px;line-height:1.6;}

.course-search{
  display:flex;align-items:center;gap:10px;
  max-width:640px;padding:6px 6px 6px 20px;border-radius:var(--r-pill);
  margin-bottom:34px;
}
.course-search svg{width:18px;height:18px;color:var(--text-3);flex-shrink:0;}
.course-search input{
  flex:1;background:none;border:none;color:var(--text-1);font-size:14.5px;font-family:var(--f-body);padding:10px 0;
}
.course-search input::placeholder{color:var(--text-3);}
.course-search button{
  flex-shrink:0;background:linear-gradient(180deg, var(--signal-2), #17b263);
  color:#03150a;font-weight:600;font-size:13.5px;padding:11px 22px;border-radius:var(--r-pill);
  white-space:nowrap;
}

/* ---------- Category strip ---------- */
.course-cat-strip{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:8px;}
.course-cat-pill{
  padding:9px 16px;border-radius:var(--r-pill);font-size:13px;font-weight:500;
  color:var(--text-2);white-space:nowrap;transition:all .22s ease;
}
.course-cat-pill:hover{color:var(--text-1);border-color:var(--border-strong);transform:translateY(-2px);}
.course-cat-pill.active{
  background:var(--signal-dim);color:var(--signal);border-color:rgba(57,255,138,.35);
}

/* ---------- Course grid & cards ---------- */
.courses-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:22px;
}
.course-card{
  border-radius:var(--r-lg);overflow:hidden;display:flex;flex-direction:column;
  transition:transform .3s cubic-bezier(.2,.8,.2,1), border-color .3s ease, box-shadow .3s ease;
}
.course-card:hover{transform:translateY(-6px);border-color:rgba(57,255,138,.25);box-shadow:var(--shadow-glow);}
.cc-thumb{aspect-ratio:16/9;position:relative;overflow:hidden;background:var(--ink-800);}
.cc-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease;}
.course-card:hover .cc-thumb img{transform:scale(1.06);}
.cc-badge{
  position:absolute;top:12px;left:12px;z-index:2;
  font-family:var(--f-mono);font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;
  padding:5px 11px;border-radius:var(--r-pill);
  background:rgba(5,7,8,.75);backdrop-filter:blur(6px);
  color:var(--signal);border:1px solid rgba(57,255,138,.25);
}
.cc-level{
  position:absolute;top:12px;right:12px;z-index:2;
  font-size:10.5px;font-weight:600;padding:5px 11px;border-radius:var(--r-pill);
  background:rgba(5,7,8,.75);backdrop-filter:blur(6px);color:var(--text-2);
  border:1px solid var(--border);
}
.cc-body{padding:18px 18px 8px;display:flex;flex-direction:column;gap:10px;flex:1;}
.cc-body h3{font-size:16px;font-weight:600;line-height:1.35;letter-spacing:-.01em;}
.cc-meta{display:flex;align-items:center;gap:14px;font-size:12px;color:var(--text-3);font-family:var(--f-mono);flex-wrap:wrap;}
.cc-meta span{display:inline-flex;align-items:center;gap:5px;}
.cc-meta svg{width:13px;height:13px;color:var(--signal);}
.cc-instructor{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--text-2);}
.cc-instructor .avatar{
  width:24px;height:24px;border-radius:50%;background:var(--signal-dim);color:var(--signal);
  display:flex;align-items:center;justify-content:center;font-size:10.5px;font-weight:700;flex-shrink:0;
}
.cc-foot{padding:14px 18px 18px;margin-top:auto;}
.cc-foot .btn{width:100%;justify-content:center;padding:11px 18px;font-size:13.5px;}

.courses-empty{
  text-align:center;padding:80px 20px;color:var(--text-3);
}
.courses-empty svg{width:44px;height:44px;margin:0 auto 16px;color:var(--text-3);}
.courses-empty h3{color:var(--text-1);font-size:17px;margin-bottom:8px;}

/* =========================================================
   COURSE DETAILS PAGE
   ========================================================= */
.cd-wrap{padding-top:104px;padding-bottom:70px;}
.cd-breadcrumb{
  display:inline-flex;align-items:center;gap:4px;max-width:100%;
  padding:9px 14px 9px 12px;margin-bottom:22px;border-radius:var(--r-pill);
  background:var(--glass);border:1px solid var(--border-soft);
  font-family:var(--f-mono);font-size:12.5px;color:var(--text-3);
  overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;
}
.cd-breadcrumb::-webkit-scrollbar{display:none;}
.cd-bc-home{width:14px;height:14px;color:var(--signal);flex-shrink:0;margin-right:4px;}
.cd-breadcrumb a{
  color:var(--text-2);white-space:nowrap;padding:5px 9px;border-radius:var(--r-pill);
  transition:color .2s ease, background .2s ease;
}
.cd-breadcrumb a:hover{color:var(--signal);background:var(--glass-hover);}
.cd-bc-chev{width:11px;height:11px;color:var(--text-3);opacity:.55;flex-shrink:0;}
.cd-bc-current{
  color:var(--signal);font-weight:600;white-space:nowrap;
  padding:5px 12px;border-radius:var(--r-pill);flex-shrink:1;
  background:var(--signal-dim);border:1px solid rgba(57,255,138,.25);
  max-width:260px;overflow:hidden;text-overflow:ellipsis;
}
@media (max-width:640px){
  .cd-breadcrumb{font-size:12px;padding:8px 12px 8px 10px;}
  .cd-bc-current{max-width:150px;}
}

.cd-layout{
  display:grid;
  grid-template-columns:280px 1fr 300px;
  gap:22px;
  align-items:start;
}

/* ---- LEFT: curriculum sidebar ---- */
.cd-sidebar{
  border-radius:var(--r-lg);overflow:hidden;position:sticky;top:96px;
  max-height:calc(100vh - 116px);display:flex;flex-direction:column;
}
.cd-sidebar-head{padding:18px 18px 14px;border-bottom:1px solid var(--border-soft);}
.cd-sidebar-head h3{font-size:14.5px;font-weight:600;line-height:1.35;margin-bottom:8px;}
.cd-progress-mini{display:flex;align-items:center;gap:8px;}
.cd-progress-track{flex:1;height:5px;border-radius:99px;background:var(--ink-700);overflow:hidden;}
.cd-progress-fill{height:100%;background:linear-gradient(90deg,var(--signal-2),var(--signal));border-radius:99px;}
.cd-progress-pct{font-size:11px;color:var(--signal);font-family:var(--f-mono);font-weight:600;white-space:nowrap;}
.cd-lesson-list{overflow-y:auto;padding:8px;flex:1;}
.cd-lesson{
  display:flex;align-items:center;gap:12px;padding:11px 10px;border-radius:12px;cursor:pointer;
  transition:background .2s ease;border:1px solid transparent;
}
.cd-lesson:hover{background:var(--glass-hover);}
.cd-lesson.active{background:var(--signal-dim);border-color:rgba(57,255,138,.3);}
.cd-lesson-num{
  width:28px;height:28px;border-radius:8px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
  background:var(--ink-800);border:1px solid var(--border);
  font-family:var(--f-mono);font-size:11px;font-weight:700;color:var(--text-2);
}
.cd-lesson.active .cd-lesson-num{background:var(--signal);color:#03150a;border-color:var(--signal);}
.cd-lesson-info{flex:1;min-width:0;}
.cd-lesson-info .lt{font-size:13px;font-weight:500;color:var(--text-1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;line-height:1.3;}
.cd-lesson.active .cd-lesson-info .lt{color:var(--signal);}
.cd-lesson-info .ld{font-size:11px;color:var(--text-3);margin-top:2px;font-family:var(--f-mono);}
.cd-lesson-check{width:16px;height:16px;flex-shrink:0;color:var(--signal);opacity:0;}
.cd-lesson.watched .cd-lesson-check{opacity:1;}

/* ---- CENTER: video ---- */
.cd-center{min-width:0;}
.cd-video-wrap{
  border-radius:var(--r-lg);overflow:hidden;position:relative;
  box-shadow:var(--shadow-1);
}
.cd-video-frame{position:relative;width:100%;aspect-ratio:16/9;background:#000;}
.cd-video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0;}
.cd-video-info{padding:22px 4px 0;}
.cd-video-info h1{font-family:var(--f-display);font-size:clamp(19px,2.4vw,24px);font-weight:600;letter-spacing:-.01em;margin-bottom:10px;}
.cd-video-meta{display:flex;align-items:center;gap:16px;font-size:12.5px;color:var(--text-3);font-family:var(--f-mono);margin-bottom:16px;flex-wrap:wrap;}
.cd-video-meta span{display:inline-flex;align-items:center;gap:6px;}
.cd-video-meta svg{width:14px;height:14px;color:var(--signal);}
.cd-video-desc{color:var(--text-2);font-size:14px;line-height:1.7;padding-bottom:22px;border-bottom:1px solid var(--border-soft);margin-bottom:18px;}
.cd-nav-btns{display:flex;gap:12px;}
.cd-nav-btns .btn{flex:1;justify-content:center;}
.cd-nav-btns .btn[disabled]{opacity:.35;pointer-events:none;}

/* ---- RIGHT: course info ---- */
.cd-info{border-radius:var(--r-lg);padding:20px;position:sticky;top:96px;display:flex;flex-direction:column;gap:18px;}
.cd-info h4{font-size:13px;font-weight:600;text-transform:uppercase;letter-spacing:.05em;color:var(--text-3);}
.cd-info-stats{display:flex;flex-direction:column;gap:12px;}
.cd-info-row{display:flex;align-items:center;justify-content:space-between;font-size:13px;}
.cd-info-row .k{color:var(--text-3);display:flex;align-items:center;gap:8px;}
.cd-info-row .k svg{width:14px;height:14px;color:var(--signal);}
.cd-info-row .v{color:var(--text-1);font-weight:500;}
.cd-instructor-card{display:flex;align-items:center;gap:12px;padding-top:16px;border-top:1px solid var(--border-soft);}
.cd-instructor-card .avatar{
  width:44px;height:44px;border-radius:50%;background:var(--signal-dim);color:var(--signal);
  display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700;flex-shrink:0;
}
.cd-instructor-card .name{font-size:13.5px;font-weight:600;color:var(--text-1);}
.cd-instructor-card .role{font-size:11.5px;color:var(--text-3);}
.cd-info .btn-block{margin-top:2px;}

/* ---- Mobile accordion curriculum ---- */
.cd-accordion{display:none;border-radius:var(--r-lg);overflow:hidden;margin-top:18px;}
.cd-accordion-head{
  display:flex;align-items:center;justify-content:space-between;padding:16px 18px;cursor:pointer;
}
.cd-accordion-head h3{font-size:14px;font-weight:600;}
.cd-accordion-head svg{width:18px;height:18px;color:var(--text-2);transition:transform .25s ease;}
.cd-accordion.open .cd-accordion-head svg{transform:rotate(180deg);}
.cd-accordion-body{max-height:0;overflow:hidden;transition:max-height .3s ease;}
.cd-accordion.open .cd-accordion-body{max-height:1400px;}
.cd-accordion-body .cd-lesson-list{max-height:none;padding:6px 10px 14px;}

/* =========================================================
   Responsive — mirrors assets/css/responsive.css breakpoints
   ========================================================= */
@media (max-width:1180px){
  .courses-grid{grid-template-columns:repeat(2,1fr);}
  .cd-layout{grid-template-columns:250px 1fr 260px;}
}
@media (max-width:900px){
  .cd-layout{grid-template-columns:1fr;}
  .cd-sidebar,.cd-info{position:static;max-height:none;}
  .cd-sidebar{display:none;} /* replaced by accordion below the video on mobile/tablet */
  .cd-accordion{display:block;}
  .cd-info{order:3;}
  .course-search{padding-left:16px;}
}
@media (max-width:640px){
  .courses-grid{grid-template-columns:1fr;}
  .courses-hero{padding-top:20px;}
  .course-search{flex-wrap:wrap;border-radius:22px;padding:14px 16px;}
  .course-search input{width:100%;order:1;padding:6px 0;}
  .course-search svg{order:0;}
  .course-search button{order:2;width:100%;justify-content:center;}
  .cd-video-meta{gap:10px;}
  .cd-nav-btns .btn span{display:none;}
}