/* H2RES 2.0 interactive model map — hub diagram + module pages */

:root {
  --hub-power: #159389;
  --hub-heat: #c56f43;
  --hub-efuel: #4f83bf;
  --hub-transport: #4f897d;
  --hub-frame-bg: #ffffff;
  --hub-frame-text: #475569;
  --hub-edge: #94a3b8;
  --hub-edge-hover: #159389;
  --hub-node-text: #ffffff;
}
[data-theme="dark"] {
  --hub-power: #2FA595;
  --hub-heat: #C77E52;
  --hub-efuel: #5E97CC;
  --hub-transport: #6FA24A;
  --hub-frame-bg: #1B242A;
  --hub-frame-text: #A6B6BC;
  --hub-edge: #55636B;
  --hub-edge-hover: #40B59D;
  --hub-node-text: #ffffff;
}

/* ---------- Hub diagram ---------- */
.hub-card { padding: 20px 16px 14px; }

.hub-wrap {
  max-width: 860px;
  margin: 0 auto;
}

.hub-svg {
  width: 100%;
  height: auto;
  display: block;
  overflow: visible;
}

.hub-svg text {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  text-anchor: middle;
  dominant-baseline: middle;
  pointer-events: none;
}

/* Nodes */
.hub-node rect {
  transition: transform 0.18s ease, filter 0.18s ease;
  transform-box: fill-box;
  transform-origin: center;
}
.hub-node:hover rect,
.hub-node:focus-visible rect {
  filter: brightness(1.06);
  transform: scale(1.03);
}
.hub-node:focus-visible {
  outline: none;
}
.hub-node:focus-visible rect {
  stroke: var(--hub-edge-hover);
  stroke-width: 3;
}

.hub-node text {
  font-size: 25px;
  font-weight: 700;
  fill: var(--hub-node-text);
}
.hub-node .hub-power-label { font-size: 30px; letter-spacing: 0.04em; }
.hub-node .hub-sub {
  font-size: 13px;
  font-weight: 500;
  opacity: 0.9;
}

.hub-node--power rect { fill: var(--hub-power); }
.hub-node--heat rect { fill: var(--hub-heat); }
.hub-node--efuel rect { fill: var(--hub-efuel); }
.hub-node--transport rect { fill: var(--hub-transport); }

.hub-node--frame rect {
  fill: var(--hub-frame-bg);
  stroke: var(--line-strong);
  stroke-width: 1.5;
}
.hub-node--frame text {
  fill: var(--hub-frame-text);
  font-size: 16px;
  font-weight: 600;
}
.hub-node--frame .hub-sub { font-size: 11px; font-weight: 500; }

/* Edges */
.hub-edge line,
.hub-edge path {
  stroke: var(--hub-edge);
  stroke-width: 2.4;
  fill: none;
  marker-end: url(#arrow);
  transition: stroke 0.18s ease, stroke-width 0.18s ease;
  cursor: pointer;
}
.hub-edge--chp path {
  stroke-dasharray: 6 5;
  marker-start: url(#arrowStart);
}
.hub-edge:hover line,
.hub-edge:hover path,
.hub-edge:focus-visible line,
.hub-edge:focus-visible path {
  stroke: var(--hub-edge-hover);
  stroke-width: 3.4;
}
#arrow path,
#arrowStart path {
  stroke: var(--hub-edge);
}

.hub-hint {
  text-align: center;
  color: var(--muted);
  font-size: 13.5px;
  margin: 12px auto 2px;
  max-width: 640px;
  line-height: 1.6;
}

/* ---------- Module chips (map + fallback nav) ---------- */
.module-chip-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}
.module-chip {
  display: block;
  text-decoration: none;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--card);
  border-left: 4px solid var(--hub-edge);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}
.module-chip:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.module-chip strong { display: block; color: var(--text); font-size: 15px; margin-bottom: 4px; }
.module-chip span { display: block; color: var(--muted); font-size: 13px; line-height: 1.5; }
.module-chip--sector { border-left-color: var(--accent); }
.module-chip--core { border-left-color: var(--hub-frame-text); }
.module-chip--link { border-left-color: var(--hub-efuel); }

/* ---------- Module page ---------- */
.module-hero .module-tech { margin-top: 16px; }
.module-tech, .assume-list { }

.tech-chip {
  display: inline-block;
  margin: 0 6px 6px 0;
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 12.5px;
  font-weight: 600;
}

.module-para {
  color: var(--text);
  line-height: 1.72;
  font-size: 15.5px;
  margin: 0 0 12px;
}
.module-para:last-child { margin-bottom: 0; }

.eq-caption { font-weight: 500; text-transform: none; letter-spacing: 0; color: var(--muted); }

.equation {
  padding: 14px 0;
  border-top: 1px solid var(--line);
}
.equation:first-child { border-top: none; padding-top: 4px; }
.equation-name {
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}
.equation-render {
  color: var(--text);
  overflow-x: auto;
  overflow-y: hidden;
  padding: 6px 2px;
}
.equation-render .katex { color: var(--text); font-size: 1.12em; }
.equation-desc {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.68;
  margin: 2px 0 14px;
}

.assume-list {
  margin: 0;
  padding-left: 20px;
  color: var(--text);
}
.assume-list li { margin-bottom: 8px; line-height: 1.6; font-size: 15px; }

.module-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.module-nav-link {
  text-decoration: none;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  transition: color 0.18s ease, border-color 0.18s ease;
}
.module-nav-link:hover { color: var(--accent); border-color: var(--accent); }

@media (max-width: 620px) {
  .hub-node text { font-size: 22px; }
  .hub-node .hub-power-label { font-size: 26px; }
  .equation-render .katex { font-size: 1em; }
}

/* ============================================================
   H2RES 2.0 — four-sector interactive System map
   ============================================================ */
:root {
  --sm-power: #0e7a70;
  --sm-heat: #7c3aed;
  --sm-efuel: #2563eb;
  --sm-transport: #15803d;
}
[data-theme="dark"] {
  --sm-power: #12a394;
  --sm-heat: #9366f0;
  --sm-efuel: #4f83e6;
  --sm-transport: #2fa85f;
}

.sm-title {
  font-size: 34px;
  letter-spacing: -0.02em;
  margin: 4px 0 20px;
}

.sm-cols {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  align-items: stretch;
}

.sm-block {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  background: var(--card);
  border: 1px solid var(--line);
  border-top: 5px solid var(--c);
  border-radius: 16px;
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}
.sm-block:hover,
.sm-block:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-strong);
  outline: none;
}
.sm-block:focus-visible { border-color: var(--c); }
.sm-block:hover .sm-go { transform: translateX(3px); }

.sm-head { display: flex; align-items: center; gap: 11px; padding: 13px 14px 10px; }
.sm-badge {
  width: 34px; height: 34px; border-radius: 9px; flex: 0 0 auto;
  background: var(--c); color: #fff; font-weight: 800; font-size: 14px;
  display: flex; align-items: center; justify-content: center;
}
.sm-heti b { font-size: 16px; color: var(--text); letter-spacing: 0.01em; }
.sm-heti small { display: block; color: var(--muted); font-size: 11.5px; margin-top: 1px; }
.sm-go { margin-left: auto; color: var(--c); font-size: 18px; font-weight: 700; transition: transform 0.18s ease; }

.sm-groups { padding: 0 12px 12px; flex: 1; display: flex; flex-direction: column; gap: 10px; }
.sm-gl { font-size: 10px; letter-spacing: 0.09em; text-transform: uppercase; color: var(--muted); margin: 2px 0 6px; font-weight: 700; }
.sm-chips { display: flex; gap: 6px; flex-wrap: wrap; }
.sm-chip {
  background: var(--c); color: #fff; border-radius: 8px; padding: 6px 9px;
  font-size: 11px; font-weight: 800; line-height: 1.15; text-align: center;
}
.sm-chip small { display: block; font-weight: 500; opacity: 0.9; font-size: 9px; }

.sm-demand {
  margin: auto 12px 12px; border: 1.5px dashed var(--c);
  color: var(--text); background: color-mix(in srgb, var(--c) 7%, var(--card));
  border-radius: 11px; padding: 8px 10px; font-size: 11.5px; font-weight: 800; text-align: center;
}
.sm-demand small { display: block; font-weight: 500; color: var(--muted); font-size: 10px; }

/* Electricity bus rail (coupling) */
.sm-bus {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 16px; text-decoration: none;
  background: linear-gradient(90deg, #0e7a70, #0b645c);
  border-radius: 14px; padding: 13px 16px; color: #fff;
  box-shadow: 0 12px 26px rgba(14, 122, 112, 0.28);
  transition: transform 0.18s ease, box-shadow 0.18s ease;
}
.sm-bus:hover, .sm-bus:focus-visible { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(14,122,112,0.36); outline: none; }
.sm-bus:hover .sm-go { transform: translateX(3px); }
.sm-bus b { font-size: 14px; letter-spacing: 0.02em; }
.sm-bus-tags { display: flex; gap: 9px; flex-wrap: wrap; }
.sm-tag { background: rgba(255,255,255,0.16); border-radius: 999px; padding: 4px 10px; font-size: 11.5px; font-weight: 700; }
.sm-bus .sm-go { color: #fff; margin-left: auto; }

.sm-h2note { text-align: center; color: var(--muted); font-size: 12.5px; margin: 10px auto 0; }
.sm-h2note b { color: var(--sm-efuel); }
.sm-chp { color: var(--sm-heat); font-weight: 800; }

/* Policies bar */
.sm-policies {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  margin-top: 14px; text-decoration: none;
  border: 1px solid var(--line); background: var(--card);
  border-radius: 13px; padding: 11px 14px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.sm-policies:hover, .sm-policies:focus-visible { border-color: var(--accent); box-shadow: var(--shadow); outline: none; }
.sm-pol-lab { font-weight: 800; color: var(--text); font-size: 13px; }
.sm-pills { display: flex; gap: 8px; flex-wrap: wrap; }
.sm-pill { border: 1px solid var(--line); border-radius: 999px; padding: 5px 11px; background: color-mix(in srgb, var(--muted) 6%, var(--card)); font-weight: 600; color: var(--muted); font-size: 11.5px; }

.sm-hint { text-align: center; color: var(--muted); font-size: 12.5px; margin: 16px auto 0; max-width: 720px; line-height: 1.6; }

@media (max-width: 900px) {
  .sm-cols { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .sm-cols { grid-template-columns: 1fr; }
  .sm-title { font-size: 28px; }
}

.hero .sm-map { margin-top: 44px; }

/* Module tab bar (sector navigation on the formulation pages) */
.module-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 22px; }
.module-tab { font-size: 13px; font-weight: 600; color: var(--muted); text-decoration: none; padding: 7px 14px; border: 1px solid var(--line); border-radius: 999px; background: var(--card); transition: color .15s, border-color .15s, background .15s; white-space: nowrap; }
.module-tab:hover { color: var(--accent); border-color: var(--accent); }
.module-tab.active { color: #fff; background: var(--accent); border-color: var(--accent); }

/* On narrow screens let the (now many) module tabs scroll horizontally
   instead of wrapping into several rows. */
@media (max-width: 640px) {
  .module-tabs { flex-wrap: nowrap; overflow-x: auto; padding-bottom: 6px; -webkit-overflow-scrolling: touch; scrollbar-width: thin; }
  .module-tab { flex: 0 0 auto; }
}

/* ===== Email-gated H2RES 2.0 download (CTA + modal) ===== */
.dl-cta {
  margin: 40px auto 8px;
  max-width: 640px;
  padding: 30px 28px;
  text-align: center;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
}
.dl-cta-title {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: 22px; font-weight: 600; margin: 0 0 8px; color: var(--text);
}
.dl-cta-text {
  font-size: 15px; line-height: 1.6; color: var(--muted);
  max-width: 52ch; margin: 0 auto 20px;
}
.dl-open-btn { gap: 8px; }

/* Modal */
.dl-modal {
  position: fixed; inset: 0; z-index: 200;
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
}
.dl-modal[hidden] { display: none; }
.dl-modal-backdrop {
  position: absolute; inset: 0;
  background: rgba(9, 15, 17, 0.55);
  backdrop-filter: blur(2px);
}
.dl-modal-card {
  position: relative; z-index: 1;
  width: 100%; max-width: 440px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 28px 26px 24px;
  box-shadow: var(--shadow-strong, 0 24px 60px rgba(0,0,0,.28));
}
.dl-modal-close {
  position: absolute; top: 12px; right: 14px;
  width: 34px; height: 34px; padding: 0;
  border: none; background: transparent;
  font-size: 26px; line-height: 1; color: var(--muted);
  cursor: pointer; border-radius: 8px;
}
.dl-modal-close:hover, .dl-modal-close:focus-visible { color: var(--text); background: color-mix(in srgb, var(--muted) 14%, transparent); }
.dl-modal-title {
  font-family: "Space Grotesk", system-ui, sans-serif;
  font-size: 21px; font-weight: 600; margin: 0 8px 8px 0; color: var(--text);
}
.dl-modal-desc { font-size: 14px; line-height: 1.55; color: var(--muted); margin: 0 0 4px; }
.dl-form { display: flex; flex-direction: column; gap: 8px; margin-top: 16px; }
.dl-label { font-size: 13px; font-weight: 600; color: var(--text); }
.dl-input {
  padding: 11px 14px; font-size: 15px;
  color: var(--text); background: var(--bg);
  border: 1px solid var(--line-strong); border-radius: 10px;
  width: 100%;
}
.dl-input:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.dl-submit { width: 100%; justify-content: center; margin-top: 6px; }
.dl-status { font-size: 13.5px; line-height: 1.5; margin: 12px 0 0; min-height: 1em; color: var(--muted); }
.dl-status.is-success { color: #157f4c; }
.dl-status.is-error { color: #c0392b; }
[data-theme="dark"] .dl-status.is-success { color: #58c483; }
[data-theme="dark"] .dl-status.is-error { color: #f08a7a; }
.dl-target { position: absolute; width: 0; height: 0; border: 0; }
body.dl-modal-open { overflow: hidden; }

@media (max-width: 480px) {
  .dl-cta { padding: 24px 18px; }
  .dl-modal-card { padding: 24px 18px 20px; }
}