/* VoltX Learning Hub demo — shared styles.
   Colours and type taken from voltxenergy.com.au (Shopify theme: button 230,118,51; text 8,49,68; font Assistant).
   Layout patterns adapted from Sam's self-serve course prototype; styled after HubSpot Academy. */

:root {
  --vx-orange: #E67633;
  --vx-orange-hover: #D4652A;
  --vx-orange-ink: #B9531A;          /* orange that passes contrast as text */
  --vx-orange-soft: #FDF1E9;
  --vx-navy: #083144;
  --vx-navy-2: #0D4560;
  --vx-ink: #083144;
  --vx-ink-muted: #4F6B78;
  --vx-ink-faint: #8DA1AA;
  --vx-surface: #FFFFFF;
  --vx-soft: #F6F6F6;
  --vx-raised: #EEF2F4;
  --vx-border: #DCE3E7;
  --vx-border-soft: #E9EEF0;
  --vx-done: #2E8B57;
  --vx-radius: 14px;
  --vx-radius-sm: 8px;
  --vx-shadow: 0 1px 2px rgba(8,49,68,.06), 0 6px 20px -8px rgba(8,49,68,.18);
  --vx-font: "Assistant", system-ui, -apple-system, "Segoe UI", sans-serif;
  --side: 300px;
  --col: 780px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body { background: var(--vx-surface); color: var(--vx-ink); font-family: var(--vx-font); font-size: 17px; line-height: 1.6;
  -webkit-font-smoothing: antialiased; }
a { color: var(--vx-orange-ink); }
b, strong { font-weight: 700; }
h1, h2, h3 { color: var(--vx-navy); line-height: 1.2; text-wrap: balance; }
h1 { font-size: clamp(30px, 4vw, 42px); font-weight: 800; letter-spacing: -.01em; margin: 6px 0 10px; }
h2 { font-size: 26px; font-weight: 800; margin: 40px 0 10px; }
h3 { font-size: 19px; font-weight: 700; margin: 0 0 4px; }
p { text-wrap: pretty; }
button { font: inherit; cursor: pointer; }
:focus-visible { outline: 3px solid var(--vx-orange); outline-offset: 2px; }
svg.i { width: 18px; height: 18px; flex-shrink: 0; }
.muted { color: var(--vx-ink-muted); }
.small { font-size: 14px; }

/* ── Demo banner + top bar ──────────────────────── */
.demo-bar { background: var(--vx-navy); color: #CFE0E8; font-size: 13px; text-align: center; padding: 7px 16px; }
.demo-bar a { color: #fff; font-weight: 600; }
.demo-bar .short { display: none; }
@media (max-width: 640px) { .demo-bar .long { display: none; } .demo-bar .short { display: inline; } }
.topwrap { position: sticky; top: 0; z-index: 40; }
.top { background: #fff; border-bottom: 1px solid var(--vx-border); }
.top-in { max-width: 1200px; margin: 0 auto; display: flex; align-items: center; gap: 28px; padding: 0 24px; height: 68px; }
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--vx-navy); }
.logo img { height: 28px; width: auto; }
.logo span { font-weight: 700; font-size: 15px; padding-left: 12px; border-left: 1px solid var(--vx-border); white-space: nowrap; }
.top nav { display: flex; gap: 4px; }
.top nav a { color: var(--vx-ink); text-decoration: none; font-weight: 600; font-size: 15px; padding: 8px 12px; border-radius: var(--vx-radius-sm); }
.top nav a:hover { background: var(--vx-soft); }
.top nav a[aria-current="page"] { color: var(--vx-orange-ink); box-shadow: inset 0 -3px 0 var(--vx-orange); border-radius: 0; }
.top .me { margin-left: auto; display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 600; }
.avatar { width: 34px; height: 34px; border-radius: 50%; background: var(--vx-orange); color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 700; }

/* ── Buttons, tags, cards ───────────────────────── */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 11px 24px;
  border: 0; border-radius: 999px; background: var(--vx-orange); color: #fff; font-weight: 700; font-size: 16px; text-decoration: none;
  transition: background .15s, transform .15s; }
.btn:hover { background: var(--vx-orange-hover); }
.btn:active { transform: scale(.97); }
.btn.ghost { background: transparent; color: var(--vx-navy); box-shadow: inset 0 0 0 2px var(--vx-border); }
.btn.ghost:hover { background: var(--vx-soft); }
.btn.light { background: #fff; color: var(--vx-navy); }
.btn.light:hover { background: var(--vx-orange-soft); }
.btn svg { width: 18px; height: 18px; }
.tag { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 700; padding: 3px 11px; border-radius: 999px;
  background: var(--vx-raised); color: var(--vx-ink-muted); white-space: nowrap; }
.tag.orange { background: var(--vx-orange-soft); color: var(--vx-orange-ink); }
.tag.green { background: #E5F3EB; color: #1F6B41; }
.tag.navy { background: var(--vx-navy); color: #fff; }
.card { background: #fff; border: 1px solid var(--vx-border); border-radius: var(--vx-radius); box-shadow: var(--vx-shadow); }
.meter { height: 8px; border-radius: 999px; background: var(--vx-raised); overflow: hidden; }
.meter > span { display: block; height: 100%; background: var(--vx-orange); border-radius: inherit; transition: width .4s ease; }

.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.crumbs { font-size: 14px; color: var(--vx-ink-muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.crumbs a { color: inherit; text-decoration: none; font-weight: 600; }
.crumbs a:hover { color: var(--vx-orange-ink); text-decoration: underline; }

/* ── Lesson shell: sidebar + reading column ─────── */
.shell { display: grid; grid-template-columns: var(--side) minmax(0, 1fr); min-height: calc(100vh - 102px); }
.side { position: sticky; top: 102px; height: calc(100vh - 102px); overflow-y: auto; background: var(--vx-soft);
  border-right: 1px solid var(--vx-border); padding: 22px 14px; display: flex; flex-direction: column; gap: 18px; }
.back { display: inline-flex; align-items: center; gap: 6px; font-size: 14px; font-weight: 600; color: var(--vx-ink-muted); text-decoration: none; padding: 4px 8px; }
.back:hover { color: var(--vx-navy); }
.side .course-name { padding: 0 8px; font-weight: 800; font-size: 18px; color: var(--vx-navy); line-height: 1.25; }
.side .prog { padding: 0 8px; display: grid; gap: 6px; font-size: 13px; color: var(--vx-ink-muted); }
.snav { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.snav-mod > a, .snav-mod > span { display: grid; grid-template-columns: 26px 1fr; gap: 10px; align-items: center; padding: 8px; border-radius: var(--vx-radius-sm);
  font-size: 15px; font-weight: 700; color: var(--vx-navy); text-decoration: none; }
.snav-mod > a:hover { background: var(--vx-raised); }
.snav-mod.locked > a { color: var(--vx-ink-faint); font-weight: 600; }
.num { width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-size: 13px; font-weight: 700; background: var(--vx-raised); color: var(--vx-ink-muted); }
.num.done { background: #E5F3EB; color: var(--vx-done); }
.num.now { background: var(--vx-orange); color: #fff; }
.num svg { width: 14px; height: 14px; }
.snav-lessons { list-style: none; margin: 2px 0 8px 30px; padding: 0; display: grid; gap: 1px; }
.snav-lessons a { display: grid; grid-template-columns: 18px 1fr; gap: 9px; align-items: start; padding: 6px 8px; border-radius: var(--vx-radius-sm);
  font-size: 14px; line-height: 1.4; color: var(--vx-ink-muted); text-decoration: none; }
.snav-lessons a:hover { background: var(--vx-raised); color: var(--vx-navy); }
.snav-lessons a[aria-current="page"] { background: #fff; color: var(--vx-navy); font-weight: 700; box-shadow: var(--vx-shadow); }
.snav-lessons .ico { display: grid; place-items: center; height: 1.4em; color: var(--vx-ink-faint); }
.snav-lessons .ico svg { width: 16px; height: 16px; }
.snav-lessons a.done .ico { color: var(--vx-done); }
.snav-lessons a[aria-current="page"] .ico { color: var(--vx-orange); }
.side-foot { margin-top: auto; padding: 0 8px; font-size: 13px; color: var(--vx-ink-faint); display: grid; gap: 6px; }
.reset { border: 0; padding: 0; background: none; color: var(--vx-ink-muted); text-decoration: underline; font-size: 13px; justify-self: start; }

.main { min-width: 0; padding: 36px 32px 120px; }
.col { max-width: var(--col); margin: 0 auto; }

/* Videos: column width by default, "Bigger" widens them (theatre mode), remembered per browser. */
.video { position: relative; margin: 22px 0 8px; border-radius: var(--vx-radius); overflow: hidden; background: #000; aspect-ratio: 916 / 480; box-shadow: var(--vx-shadow); }
.video video { display: block; width: 100%; height: 100%; object-fit: contain; background: #000; }
.col .video { --w: 100%; width: var(--w); margin-inline: calc((100% - var(--w)) / 2); }
.vid-wide .col .video { --w: max(100%, min(1180px, calc(100vw - var(--side) - 64px - 20px), calc((100vh - 140px) * 916 / 480))); }
.vid-anim .col .video { transition: width .3s ease, margin .3s ease; }
.vsize { position: absolute; top: 12px; right: 12px; z-index: 2; display: inline-flex; align-items: center; gap: 6px; padding: 6px 12px 6px 10px;
  border: 0; border-radius: 999px; background: rgba(8,49,68,.75); backdrop-filter: blur(6px); color: #fff; font-size: 13px; font-weight: 600;
  opacity: 0; visibility: hidden; transition: opacity .2s, visibility .2s; }
.video.paused .vsize, .video.show .vsize, .vsize:focus-visible { opacity: 1; visibility: visible; }
.vsize svg { width: 16px; height: 16px; }
.vid-cap { font-size: 14px; color: var(--vx-ink-muted); margin: 0 0 24px; }

.next-fab { position: fixed; right: 28px; bottom: 28px; z-index: 30; min-height: 52px; padding: 13px 26px;
  box-shadow: 0 12px 30px -8px rgba(8,49,68,.5), 0 2px 6px rgba(8,49,68,.2); }
@media (hover: hover) { .next-fab:hover { transform: translateY(-2px); } }

.tip { display: grid; grid-template-columns: 84px 1fr; gap: 16px; align-items: center; background: var(--vx-orange-soft);
  border-radius: var(--vx-radius); padding: 16px 20px 16px 10px; margin: 28px 0; }
.tip img { width: 84px; height: auto; }
.tip b { display: block; color: var(--vx-orange-ink); font-size: 14px; text-transform: uppercase; letter-spacing: .06em; }
.tip p { margin: 2px 0 0; }
.takeaways { border: 2px solid var(--vx-border); border-radius: var(--vx-radius); padding: 18px 22px; margin: 28px 0; }
.takeaways h3 { margin-bottom: 8px; }
.takeaways ul { margin: 0; padding-left: 20px; }
.takeaways li + li { margin-top: 6px; }

/* ── Small screens ──────────────────────────────── */
@media (max-width: 900px) {
  .top nav { display: none; }
  .top .me span { display: none; }
  .shell { grid-template-columns: 1fr; }
  .side { position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--vx-border); padding: 14px; gap: 10px; }
  .snav, .side-foot { display: none; }
  .main { padding: 24px 18px 110px; }
  .col .video, .vid-wide .col .video { width: 100%; margin-inline: 0; }
  .vsize { display: none; }
  .next-fab { left: 16px; right: 16px; bottom: 16px; }
}
@media (max-width: 520px) {
  .logo span { display: none; }
  .top-in { padding: 0 16px; gap: 12px; }
  .tip { grid-template-columns: 60px 1fr; }
  .tip img { width: 60px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }