/* =========================================================
   energyhub home redesign (staging). Uses only the tokens from style.css:
   slate + phosphor-green + amber, one system sans-serif stack, 4px radius.
   Everything is prefixed hv2- so it cannot touch the other pages.
   ========================================================= */

.hv2-hero {
  position: relative; overflow: hidden; background: var(--slate-900); color: #eef2ee;
  padding-block: 4.5rem 5rem;
}
.hv2-grid {
  position: absolute; inset: 0; z-index: 1;
  background-image:
    linear-gradient(transparent 31px, rgba(255,255,255,.035) 32px),
    linear-gradient(90deg, transparent 31px, rgba(255,255,255,.035) 32px);
  background-size: 32px 32px;
  mask-image: radial-gradient(120% 90% at 80% 0%, #000 30%, transparent 75%);
}
.hv2-hero-inner {
  position: relative; z-index: 2;
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: 3.5rem; align-items: center;
}
.hv2-hero .eyebrow { color: #8fb8a6; }
.hv2-title {
  font-family: var(--f-display); font-weight: 600; letter-spacing: -.02em; line-height: 1.04;
  font-size: clamp(2.3rem, 5.4vw, 4rem); margin: .5rem 0 1.1rem;
}
.hv2-title .accent { color: #4bd6a0; }
.hv2-lead { max-width: var(--measure); font-size: 1.12rem; color: #c2ccc6; margin: 0; }
.hv2-actions { display: flex; flex-wrap: wrap; gap: .9rem; margin-top: 2rem; }
.btn-outline { border-color: var(--line); color: var(--ink); background: #fff; }
.btn-outline:hover { border-color: var(--phosphor); color: var(--phosphor); }

/* progress panel in the hero */
.hv2-panel {
  background: rgba(255,255,255,.05); border: 1px solid rgba(255,255,255,.12); border-radius: var(--r);
  padding: 1.3rem 1.4rem 1.1rem; backdrop-filter: blur(6px);
}
.hv2-panel-head {
  display: flex; justify-content: space-between; align-items: baseline;
  font-size: .78rem; letter-spacing: .12em; text-transform: uppercase; color: #8fb8a6; margin-bottom: 1rem;
}
.hv2-panel-count { color: #4bd6a0; font-weight: 600; letter-spacing: .04em; }
.hv2-stage-mini { list-style: none; margin: 0; padding: 0; display: grid; gap: .8rem; }
.hv2-stage-mini li { display: grid; grid-template-columns: 1fr 6.5rem 2.4rem; align-items: center; gap: .8rem; font-size: .9rem; }
.hv2-stage-name { color: #dfe7e2; }
.hv2-stage-num { text-align: right; color: #8fb8a6; font-size: .8rem; }
.hv2-panel-foot { margin: 1rem 0 0; padding-top: .8rem; border-top: 1px solid rgba(255,255,255,.1); font-size: .78rem; color: #8fb8a6; }

.hv2-bar { display: block; height: 6px; border-radius: 99px; background: rgba(255,255,255,.14); overflow: hidden; min-width: 1.5rem; }
.hv2-bar > span { display: block; height: 100%; background: #4bd6a0; border-radius: 99px; }

/* facts strip */
.hv2-facts { background: #fff; border-bottom: 1px solid var(--line); }
.hv2-facts-inner { display: grid; grid-template-columns: repeat(4, 1fr); }
.hv2-facts-inner > div { padding: 1.4rem 1.2rem; display: flex; flex-direction: column; gap: .15rem; }
.hv2-facts-inner > div + div { border-left: 1px solid var(--line); }
.hv2-facts-inner strong { font-size: 1.7rem; font-weight: 600; letter-spacing: -.02em; color: var(--phosphor); line-height: 1.15; }
.hv2-facts-inner strong small { font-size: 1rem; font-weight: 500; color: var(--slate-700); }
.hv2-facts-inner span { font-size: .86rem; color: var(--slate-700); }

/* generic blocks */
.hv2-block { padding-block: 4.5rem; }
.hv2-head { max-width: 46rem; margin-bottom: 2.2rem; }
.hv2-head h2 { font-family: var(--f-display); font-weight: 600; font-size: clamp(1.7rem, 3.4vw, 2.3rem); letter-spacing: -.02em; line-height: 1.15; margin: .4rem 0 .7rem; }
.hv2-head p:last-child { color: var(--slate-700); margin: 0; }
.hv2-head--light h2 { color: #fff; }
.hv2-head--light .eyebrow { color: #8fb8a6; }

/* learning-path staircase */
.hv2-stages { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.hv2-stage {
  background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 1.3rem 1.4rem;
  display: flex; flex-direction: column; gap: .5rem;
  transition: border-color .15s, box-shadow .15s, transform .12s;
}
.hv2-stage:hover { border-color: var(--phosphor); box-shadow: var(--shadow); transform: translateY(-2px); }
.hv2-stage .hv2-bar { background: var(--paper-2); }
.hv2-stage .hv2-bar { max-width: 100%; }
.hv2-stage .hv2-bar > span { background: var(--phosphor); }
.hv2-stage-idx { font-size: .85rem; color: var(--phosphor); background: var(--phosphor-lite); border-radius: var(--r); padding: .1rem .45rem; align-self: flex-start; }
.hv2-stage h3 { font-family: var(--f-display); font-weight: 600; font-size: 1.2rem; letter-spacing: -.01em; margin: .2rem 0 .1rem; }
.hv2-stage-meta { margin: 0; font-size: .82rem; color: var(--slate-700); }
.hv2-stage-link { margin-top: auto; padding-top: .6rem; font-size: .92rem; font-weight: 600; color: var(--phosphor); }
.hv2-stage-link:hover { text-decoration: underline; }
.hv2-soon { margin-top: auto; padding-top: .6rem; font-size: .85rem; color: var(--amber); }
.hv2-more { margin: 2rem 0 0; }

/* sections band */
.hv2-band { background: var(--paper-2); border-block: 1px solid var(--line); }
.hv2-sections { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem; }
.hv2-section {
  display: flex; flex-direction: column; background: #fff; border: 1px solid var(--line); border-radius: var(--r);
  padding: 1.35rem 1.5rem; transition: border-color .15s, box-shadow .15s, transform .12s;
}
.hv2-section:hover { border-color: var(--phosphor); box-shadow: var(--shadow); transform: translateY(-2px); }
.hv2-section-head { display: flex; align-items: baseline; gap: .7rem; margin-bottom: .8rem; }
.hv2-section-head h3 { font-family: var(--f-display); font-weight: 600; font-size: 1.2rem; letter-spacing: -.01em; margin: 0; }

/* recently updated */
.hv2-latest { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.hv2-latest li { border-bottom: 1px solid var(--line); }
.hv2-latest a {
  display: grid; grid-template-columns: 11rem 1fr auto; gap: .3rem 1.4rem; align-items: baseline;
  padding: 1.1rem .4rem; transition: background .12s, padding-left .12s;
}
.hv2-latest a:hover { background: #fff; padding-left: 1rem; }
.hv2-latest-sec { font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--phosphor); }
.hv2-latest-title { font-weight: 600; font-size: 1.08rem; letter-spacing: -.01em; }
.hv2-latest-sum { grid-column: 2; grid-row: 2; font-size: .92rem; color: var(--slate-700); }
.hv2-latest-date { grid-column: 3; grid-row: 1; font-size: .8rem; color: var(--slate-700); white-space: nowrap; }

/* principles */
.hv2-principles { background: var(--slate-900); color: #dfe7e2; }
.hv2-cols { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.hv2-cols > div { border-top: 2px solid #4bd6a0; padding-top: 1.1rem; }
.hv2-cols h3 { font-family: var(--f-display); font-weight: 600; font-size: 1.15rem; color: #fff; margin: 0 0 .5rem; }
.hv2-cols p { margin: 0; color: #b9c5be; font-size: .96rem; }

/* closing */
.hv2-final { text-align: center; }
.hv2-final h2 { font-family: var(--f-display); font-weight: 600; font-size: clamp(1.6rem, 3vw, 2.1rem); letter-spacing: -.02em; margin: 0; }
.hv2-final .hv2-actions { justify-content: center; }

@media (max-width: 980px) {
  .hv2-hero-inner { grid-template-columns: 1fr; gap: 2.2rem; }
  .hv2-stages, .hv2-sections { grid-template-columns: repeat(2, 1fr); }
  .hv2-cols { grid-template-columns: 1fr; }
  .hv2-facts-inner { grid-template-columns: repeat(2, 1fr); }
  .hv2-facts-inner > div:nth-child(3) { border-left: 0; }
  .hv2-facts-inner > div:nth-child(n+3) { border-top: 1px solid var(--line); }
}
@media (max-width: 640px) {
  .hv2-hero { padding-block: 3rem 3.2rem; }
  .hv2-block { padding-block: 3rem; }
  .hv2-stages, .hv2-sections { grid-template-columns: 1fr; }
  .hv2-latest a { grid-template-columns: 1fr; }
  .hv2-latest-sum, .hv2-latest-date { grid-column: 1; grid-row: auto; }
  .hv2-stage-mini li { grid-template-columns: 1fr 4rem 2.2rem; }
  .hv2-actions .btn { width: 100%; justify-content: center; }
}

/* the shared header nav wraps item text on phones; keep items on one line and scroll instead */
@media (max-width: 780px) {
  .site-nav a { white-space: nowrap; }
}

/* =========================================================
   Inner-page twins: learning path, section index, article
   ========================================================= */
.hv2-pagehead, .hv2-ahead { background: var(--slate-900); color: #eef2ee; position: relative; overflow: hidden; }
.hv2-pagehead::before, .hv2-ahead::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: linear-gradient(transparent 31px, rgba(255,255,255,.035) 32px), linear-gradient(90deg, transparent 31px, rgba(255,255,255,.035) 32px);
  background-size: 32px 32px; mask-image: radial-gradient(120% 90% at 85% 0%, #000 25%, transparent 70%);
}
.hv2-pagehead .wrap, .hv2-ahead .wrap { position: relative; z-index: 1; }
.hv2-pagehead { padding-block: 3.2rem 2.6rem; }
.hv2-ahead { padding-block: 2.6rem 2.6rem; }
.hv2-pagehead .crumb, .hv2-crumbs a { color: #8fb8a6; }
.hv2-crumbs { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; font-size: .82rem; margin-bottom: 1rem; }
.hv2-crumbs span { color: #5d6f66; }
.hv2-crumbs a:hover, .hv2-pagehead .crumb:hover { color: #4bd6a0; }
.hv2-ahead .eyebrow { color: #8fb8a6; }
.hv2-h1 { font-family: var(--f-display); font-weight: 600; font-size: clamp(2rem, 4.6vw, 3.1rem); letter-spacing: -.02em; line-height: 1.08; margin: .5rem 0 0; color: #fff; }
.hv2-sub { max-width: var(--measure); font-size: 1.1rem; color: #c2ccc6; margin: 1rem 0 0; }
.hv2-ameta { display: flex; flex-wrap: wrap; gap: .4rem 1.4rem; margin: 1.1rem 0 0; font-size: .82rem; color: #8fb8a6; }
.hv2-ameta a { color: #4bd6a0; }
.hv2-ameta a:hover { text-decoration: underline; }

/* learning path */
.hv2-jump { list-style: none; display: flex; flex-wrap: wrap; gap: .6rem; margin: 1.8rem 0 0; padding: 0; }
.hv2-jump a { display: inline-flex; align-items: center; gap: .55rem; padding: .45rem .9rem; border: 1px solid rgba(255,255,255,.2); border-radius: 999px; font-size: .86rem; color: #dfe7e2; transition: border-color .15s, color .15s; }
.hv2-jump a:hover { border-color: #4bd6a0; color: #4bd6a0; }
.hv2-jump span { color: #4bd6a0; font-size: .78rem; }
.hv2-jump small { color: #8fb8a6; }
.hv2-lp { padding-block: 3rem 5rem; }
.hv2-lp-stage { display: grid; grid-template-columns: 14rem minmax(0, 1fr); gap: 2.2rem; padding-block: 2rem; border-top: 1px solid var(--line); scroll-margin-top: 5rem; }
.hv2-lp-stage:first-child { border-top: 0; padding-top: 0; }
.hv2-lp-side { position: sticky; top: 5rem; align-self: start; }
.hv2-lp-side h2 { font-family: var(--f-display); font-weight: 600; font-size: 1.45rem; letter-spacing: -.01em; margin: .5rem 0 .3rem; }
.hv2-lp-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: .55rem; }
.hv2-lp-step { display: grid; grid-template-columns: 2.6rem 1fr auto auto; align-items: center; gap: .9rem; background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: .95rem 1rem; transition: border-color .12s, transform .12s, box-shadow .12s; }
a.hv2-lp-step:hover { border-color: var(--phosphor); transform: translateX(3px); box-shadow: var(--shadow); }
.hv2-lp-num { color: var(--phosphor); font-size: .9rem; text-align: right; }
.hv2-lp-title { font-family: var(--f-display); font-weight: 600; font-size: 1.05rem; letter-spacing: -.01em; }
.hv2-lp-sec { font-size: .74rem; letter-spacing: .08em; text-transform: uppercase; color: var(--slate-700); }
.hv2-lp-arrow { color: var(--phosphor); opacity: 0; transition: opacity .12s; }
a.hv2-lp-step:hover .hv2-lp-arrow { opacity: 1; }
.hv2-lp-step--todo { background: transparent; border-style: dashed; opacity: .75; grid-template-columns: 2.6rem 1fr auto; }

/* section index */
.hv2-cards { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.1rem; padding-block: 3rem 5rem; }
.hv2-acard { display: flex; flex-direction: column; gap: .5rem; background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 1.4rem 1.5rem; transition: border-color .15s, box-shadow .15s, transform .12s; }
.hv2-acard:hover { border-color: var(--phosphor); box-shadow: var(--shadow); transform: translateY(-2px); }
.hv2-acard-no { align-self: flex-start; font-size: .82rem; color: var(--phosphor); background: var(--phosphor-lite); border-radius: var(--r); padding: .1rem .45rem; }
.hv2-acard-title { font-family: var(--f-display); font-weight: 600; font-size: 1.25rem; letter-spacing: -.01em; line-height: 1.25; }
.hv2-acard-sum { font-size: .95rem; color: var(--slate-700); }
.hv2-acard-foot { margin-top: auto; padding-top: .6rem; display: flex; justify-content: space-between; font-size: .78rem; color: var(--slate-700); }
.hv2-acard-foot span[aria-hidden] { color: var(--phosphor); font-size: 1.1rem; }

/* article */
.hv2-alayout { display: grid; grid-template-columns: 15rem minmax(0, 1fr); gap: 3rem; align-items: start; padding-block: 3rem 2.5rem; }
.hv2-toc { position: sticky; top: 88px; max-height: calc(100vh - 110px); overflow: auto; }
.hv2-toc .toc-label { margin: 0; }
.hv2-toc ul { list-style: none; margin: .5rem 0 0; padding: 0; border-left: 2px solid var(--line); }
.hv2-toc ul ul { border-left: 0; padding-left: .6rem; }
.hv2-toc a { display: block; padding: .3rem .9rem; font-size: .88rem; color: var(--slate-700); border-left: 2px solid transparent; margin-left: -2px; transition: color .12s, border-color .12s; }
.hv2-toc a:hover { color: var(--phosphor); border-color: var(--phosphor); }
.hv2-prose { max-width: var(--measure); }
.hv2-prose h2 { scroll-margin-top: 90px; }
.hv2-pn { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; padding-block: 1rem 2.5rem; }
.hv2-pn-card { display: flex; flex-direction: column; gap: .3rem; background: #fff; border: 1px solid var(--line); border-radius: var(--r); padding: 1.1rem 1.3rem; transition: border-color .15s, transform .12s; }
.hv2-pn-card:hover { border-color: var(--phosphor); transform: translateY(-2px); }
.hv2-pn-card--next { text-align: right; grid-column: 2; }
.hv2-pn-dir { font-size: .74rem; letter-spacing: .1em; text-transform: uppercase; color: var(--phosphor); }
.hv2-pn-title { font-family: var(--f-display); font-weight: 600; font-size: 1.05rem; letter-spacing: -.01em; }

@media (max-width: 900px) {
  .hv2-alayout { grid-template-columns: 1fr; }
  .hv2-toc { display: none; }
  .hv2-lp-stage { grid-template-columns: 1fr; gap: 1rem; }
  .hv2-lp-side { position: static; }
  .hv2-cards { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .hv2-pagehead, .hv2-ahead { padding-block: 2.2rem 2rem; }
  .hv2-lp-step { grid-template-columns: 2.2rem 1fr; }
  .hv2-lp-sec, .hv2-lp-arrow { display: none; }
  .hv2-pn { grid-template-columns: 1fr; }
  .hv2-pn-card--next { grid-column: 1; text-align: left; }
}