/* Appmaker Tutorials - Modern UI (mobile-first)
   No frameworks required. */

:root{
  --bg0: #0b1020;
  --bg1: #0a1226;
  --card: rgba(255,255,255,.06);
  --card2: rgba(255,255,255,.085);
  --line: rgba(255,255,255,.12);
  --text: rgba(255,255,255,.92);
  --muted: rgba(255,255,255,.72);
  --muted2: rgba(255,255,255,.58);
  --shadow: 0 18px 50px rgba(0,0,0,.35);
  --shadow2: 0 10px 28px rgba(0,0,0,.25);
  --radius: 18px;
  --radius2: 26px;
  --pad: 16px;
  --max: 1040px;
  --accent: #0D9488;
  --accent2: #FB923C;
  --focus: rgba(13,148,136,.55);
  --font: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Noto Sans", "Noto Sans Sinhala", "Noto Sans Tamil", "Apple Color Emoji", "Segoe UI Emoji";
}

html[data-theme="light"]{
  --bg0:#f7f8ff;
  --bg1:#ffffff;
  --card: rgba(10,18,38,.05);
  --card2: rgba(10,18,38,.08);
  --line: rgba(10,18,38,.12);
  --text: rgba(10,18,38,.92);
  --muted: rgba(10,18,38,.70);
  --muted2: rgba(10,18,38,.56);
  --shadow: 0 18px 60px rgba(10,18,38,.10);
  --shadow2: 0 10px 26px rgba(10,18,38,.10);
}

*{box-sizing:border-box}
html,body{min-height:100%}
body{
  min-height: 100vh;
  margin:0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 650px at 10% 0%, rgba(13,148,136,.32), transparent 60%),
    radial-gradient(900px 600px at 100% 0%, rgba(251,146,60,.22), transparent 55%),
    radial-gradient(900px 900px at 70% 100%, rgba(251,146,60,.14), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  background-repeat: no-repeat, no-repeat, no-repeat, no-repeat;
  background-size: 1200px 650px, 900px 600px, 900px 900px, cover;
  background-position: 10% 0%, 100% 0%, 70% 100%, 0 0;
  line-height:1.55;
}

a{color:inherit}
img{max-width:100%;height:auto;display:block}
.container{
  width:min(100%, calc(var(--max) + 2*var(--pad)));
  margin:0 auto;
  padding:0 var(--pad);
}

.skip-link{
  position:absolute; left:-999px; top:auto;
  width:1px; height:1px; overflow:hidden;
}
.skip-link:focus{
  left:12px; top:12px; width:auto; height:auto;
  z-index:9999;
  background: var(--bg1);
  border:1px solid var(--line);
  padding:10px 12px;
  border-radius: 12px;
  box-shadow: var(--shadow2);
}

header.topbar{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(5,10,22,.72), rgba(5,10,22,.35));
  border-bottom: 1px solid var(--line);
}
html[data-theme="light"] header.topbar{
  background: linear-gradient(180deg, rgba(255,255,255,.86), rgba(255,255,255,.55));
}

.topbar .row{
  display:flex;
  gap:12px;
  align-items:center;
  justify-content:space-between;
  padding: 12px 0;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  text-decoration:none;
  min-width: 0;
}
.brand .logo{
  width: 44px; height: 44px;
  border-radius: 14px;
  background: var(--card);
  border:1px solid var(--line);
  box-shadow: var(--shadow2);
  display:grid; place-items:center;
  overflow:hidden;
}
.brand .logo img{width: 30px; height: 30px}
.brand .meta{
  display:flex; flex-direction:column;
  min-width: 0;
}
.brand .meta .title{
  font-weight: 800;
  letter-spacing: .2px;
  font-size: 15px;
  line-height: 1.15;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand .meta .subtitle{
  font-size: 12px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.controls{
  display:flex;
  align-items:center;
  gap:10px;
}
.pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding: 8px 10px;
  border-radius: 999px;
  border:1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow2);
}
.pill .label{
  font-size: 12px;
  color: var(--muted2);
}
.seg{
  display:flex;
  gap:6px;
  background: rgba(255,255,255,.05);
  border:1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
}
.seg button{
  appearance:none;
  border:none;
  background: transparent;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  cursor:pointer;
}
.seg button[aria-pressed="true"]{
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  box-shadow: 0 10px 24px rgba(13,148,136,.18);
}
.icon-btn{
  appearance:none;
  border:1px solid var(--line);
  background: var(--card);
  color: var(--text);
  border-radius: 999px;
  padding: 10px 12px;
  cursor:pointer;
  font-weight: 800;
}
.icon-btn:active{transform: translateY(1px)}
.icon-btn small{font-weight: 800; opacity:.8}

main{padding: 20px 0 40px}

.hero{
  margin-top: 6px;
  border-radius: var(--radius2);
  border: 1px solid var(--line);
  background:
    radial-gradient(900px 420px at 10% 0%, rgba(13,148,136,.22), transparent 60%),
    radial-gradient(900px 420px at 90% 0%, rgba(251,146,60,.18), transparent 62%),
    linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.02));
  background-repeat: no-repeat, no-repeat, no-repeat;
  background-size: 900px 420px, 900px 420px, 100% 100%;
  background-position: 10% 0%, 90% 0%, 0 0;
  box-shadow: var(--shadow);
  overflow:hidden;
}
.hero-inner{
  padding: 18px;
  display:grid;
  gap: 16px;
}
@media (min-width: 860px){
  .hero-inner{
    grid-template-columns: 1.1fr .9fr;
    gap: 18px;
    padding: 22px;
    align-items: start;
  }
}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding: 8px 12px;
  border-radius: 999px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.06);
  font-size: 12px;
  color: var(--muted);
  width: fit-content;
}
.kicker .dot{
  width: 8px; height: 8px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
}

h1{
  margin: 10px 0 8px;
  font-size: clamp(22px, 5.5vw, 34px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}
.lead{
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 15px;
}

.breadcrumb{
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--muted);
}
.breadcrumb a{
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
}
.breadcrumb a:hover{
  text-decoration: underline;
  text-underline-offset: 3px;
}

.title-row{
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}
.title-row h1{
  margin: 0;
}

.section-badge{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.06);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .2px;
  text-transform: uppercase;
}
.section-badge.sec-1{background: color-mix(in oklab, #14b8a6 28%, transparent);}
.section-badge.sec-2{background: color-mix(in oklab, #f59e0b 28%, transparent);}
.section-badge.sec-3{background: color-mix(in oklab, #6366f1 28%, transparent);}
.section-badge.sec-4{background: color-mix(in oklab, #ec4899 28%, transparent);}
.section-badge.sec-5{background: color-mix(in oklab, #22c55e 28%, transparent);}
.section-badge.sec-6{background: color-mix(in oklab, #0ea5e9 28%, transparent);}
.section-badge.sec-7{background: color-mix(in oklab, #f97316 28%, transparent);}
.section-badge.sec-8{background: color-mix(in oklab, #8b5cf6 28%, transparent);}

.badges{
  display:flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}
.badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding: 10px 12px;
  border-radius: 14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.05);
  color: var(--muted);
  font-size: 13px;
}

.card{
  border-radius: var(--radius);
  border:1px solid var(--line);
  background: var(--card);
  box-shadow: var(--shadow2);
  overflow:hidden;
}

.video-wrap{
  padding: 14px;
}
.video{
  border-radius: 16px;
  overflow:hidden;
  border:1px solid rgba(255,255,255,.12);
  background:
    radial-gradient(400px 180px at 20% 0%, rgba(251,146,60,.18), transparent 65%),
    radial-gradient(400px 180px at 80% 0%, rgba(13,148,136,.22), transparent 65%),
    rgba(0,0,0,.25);
}
.video .ratio{
  aspect-ratio: 16 / 9;
  width:100%;
  position: relative;
}
.video iframe{
  position:absolute; inset:0;
  width:100%; height:100%;
  border:0;
  opacity: 0;
  transition: opacity .35s ease;
  z-index: 1;
}
.video iframe.lazyloaded{
  opacity: 1;
}
.video .placeholder{
  position:absolute; inset:0;
  display:grid; place-items:center;
  gap:10px;
  padding: 18px;
  text-align:center;
  color: rgba(255,255,255,.85);
  z-index: 2;
  transition: opacity .3s ease;
}
.video .placeholder.is-hidden,
.video .placeholder[aria-hidden="true"]{
  opacity: 0;
  pointer-events: none;
}
.video .play{
  width: 60px; height: 60px;
  border-radius: 999px;
  border:1px solid rgba(255,255,255,.25);
  background: rgba(255,255,255,.08);
  display:grid; place-items:center;
  box-shadow: 0 18px 50px rgba(0,0,0,.25);
}
.video .play svg{width: 26px; height: 26px; transform: translateX(1px)}

.progress{
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.10);
  border: 1px solid var(--line);
  overflow:hidden;
  position: relative;
}
.progress > span{
  display:block;
  height:100%;
  width: calc(var(--progress, .1) * 100%);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 999px;
}

.actions{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  padding: 14px;
  border-top: 1px solid var(--line);
}
@media (min-width: 560px){
  .actions{grid-template-columns: 1fr 1fr 1.15fr}
}
.btn{
  display:inline-flex;
  justify-content:center;
  align-items:center;
  gap:10px;
  padding: 12px 14px;
  border-radius: 14px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.06);
  text-decoration:none;
  font-weight: 800;
  font-size: 14px;
  cursor:pointer;
  user-select:none;
}
.btn:hover{background: rgba(255,255,255,.09)}
.btn:active{transform: translateY(1px)}
.btn.primary{
  border-color: rgba(13,148,136,.45);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: white;
  box-shadow: 0 20px 50px rgba(13,148,136,.14);
}
.btn.primary:hover{filter: brightness(1.03)}
.btn[aria-disabled="true"]{
  opacity: .45;
  pointer-events:none;
}

.grid{
  margin-top: 18px;
  display:grid;
  gap: 12px;
}
@media (min-width: 720px){
  .grid{grid-template-columns: 1fr 1fr}
}

.lesson-list{
  padding: 14px;
}
.lesson-list h2{
  margin: 0 0 10px;
  font-size: 14px;
  letter-spacing: .2px;
  color: var(--muted);
}
.lesson-items{
  display:grid;
  gap: 10px;
}
.lesson-item{
  display:flex;
  gap: 12px;
  align-items:flex-start;
  padding: 12px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.04);
  text-decoration:none;
}
.lesson-item:hover{background: rgba(255,255,255,.07)}
.lesson-item .n{
  width: 34px; height: 34px;
  border-radius: 12px;
  display:grid; place-items:center;
  background: rgba(255,255,255,.06);
  border:1px solid var(--line);
  font-weight: 900;
}
.lesson-item .t{
  font-weight: 900;
  margin-top: 1px;
}
.lesson-item .d{
  font-size: 12px;
  color: var(--muted);
  margin-top: 2px;
}

footer{
  margin-top: 20px;
  padding: 18px 0 30px;
  color: var(--muted2);
  text-align:center;
}
footer a{color: var(--muted); text-decoration: underline; text-underline-offset: 3px}

.totop{
  position: fixed;
  right: 14px;
  bottom: 14px;
  z-index: 100;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .18s ease, transform .18s ease;
}
.totop.show{
  opacity: 1;
  transform: translateY(0);
}

:focus-visible{
  outline: 3px solid var(--focus);
  outline-offset: 2px;
  border-radius: 12px;
}
@media (prefers-reduced-motion: reduce){
  *{scroll-behavior:auto !important; transition:none !important; animation:none !important}
}

/* Work order: section overview cards */
.section-grid{
  margin-top: 20px;
  display:grid;
  gap: 12px;
}

.section-card{
  display:grid;
  gap: 12px;
  text-decoration:none;
  color:inherit;
  border-radius: 20px;
  border:1px solid var(--line);
  background:
    radial-gradient(700px 220px at 0% 0%, rgba(13,148,136,.16), transparent 62%),
    radial-gradient(700px 220px at 100% 0%, rgba(251,146,60,.14), transparent 62%),
    linear-gradient(160deg, color-mix(in oklab, var(--card2), #ffffff 5%), var(--card));
  box-shadow: var(--shadow2);
  padding: 14px;
  transition: transform .2s ease, border-color .2s ease, background .2s ease;
}
.section-card:hover,
.section-card:focus-visible{
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--accent) 58%, var(--line));
  outline: none;
}
.section-card[data-section-prog="specialised-templates"]{
  background:
    radial-gradient(700px 220px at 0% 0%, color-mix(in oklab, #0ea5e9 28%, transparent), transparent 62%),
    radial-gradient(700px 220px at 100% 0%, color-mix(in oklab, #38bdf8 24%, transparent), transparent 62%),
    linear-gradient(160deg, color-mix(in oklab, var(--card2), #0ea5e9 10%), var(--card));
}
.section-card[data-section-prog="ecommerce-template"]{
  background:
    radial-gradient(700px 220px at 0% 0%, color-mix(in oklab, #f97316 28%, transparent), transparent 62%),
    radial-gradient(700px 220px at 100% 0%, color-mix(in oklab, #fb923c 24%, transparent), transparent 62%),
    linear-gradient(160deg, color-mix(in oklab, var(--card2), #f97316 10%), var(--card));
}
.section-card[data-section-prog="web-edge"]{
  background:
    radial-gradient(700px 220px at 0% 0%, color-mix(in oklab, #8b5cf6 28%, transparent), transparent 62%),
    radial-gradient(700px 220px at 100% 0%, color-mix(in oklab, #a78bfa 24%, transparent), transparent 62%),
    linear-gradient(160deg, color-mix(in oklab, var(--card2), #8b5cf6 10%), var(--card));
}
.section-card .s-num{
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display:inline-grid;
  place-items:center;
  font-size: 13px;
  font-weight: 900;
  letter-spacing: .3px;
  border:1px solid var(--line);
  background: rgba(255,255,255,.08);
}
.section-card .s-title{
  margin: 0;
  font-size: 18px;
  line-height: 1.28;
  letter-spacing: -.01em;
}
.section-card .s-desc{
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.section-card .s-meta{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  color: var(--muted2);
}
.section-card .s-prog{
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.10);
  border: 1px solid var(--line);
  overflow:hidden;
}
.section-card .s-prog > span{
  display:block;
  height:100%;
  width: calc(var(--progress, .1) * 100%);
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 999px;
}

.breadcrumb{
  display:inline-flex;
  flex-wrap:wrap;
  align-items:center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 12px;
  color: var(--muted);
}
.breadcrumb a{
  text-decoration:none;
  color: var(--text);
  font-weight: 700;
}
.breadcrumb a:hover{
  text-decoration: underline;
  text-underline-offset: 3px;
}
.breadcrumb .sep{
  color: var(--muted2);
  opacity: .8;
}

.section-badge{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.06);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .2px;
  text-transform: uppercase;
}
.section-badge.sec-1{background: color-mix(in oklab, #14b8a6 28%, transparent);}
.section-badge.sec-2{background: color-mix(in oklab, #f59e0b 28%, transparent);}
.section-badge.sec-3{background: color-mix(in oklab, #6366f1 28%, transparent);}
.section-badge.sec-4{background: color-mix(in oklab, #ec4899 28%, transparent);}
.section-badge.sec-5{background: color-mix(in oklab, #22c55e 28%, transparent);}
.section-badge.sec-6{background: color-mix(in oklab, #0ea5e9 28%, transparent);}
.section-badge.sec-7{background: color-mix(in oklab, #f97316 28%, transparent);}
.section-badge.sec-8{background: color-mix(in oklab, #8b5cf6 28%, transparent);}

@media (min-width: 720px){
  .section-grid{
    margin-top: 24px;
    grid-template-columns: 1fr 1fr;
  }
  .section-card{padding: 16px;}
}

@media (min-width: 1040px){
  .section-grid{
    margin-top: 28px;
    grid-template-columns: repeat(3, 1fr);
  }
}