:root {
  --ink: #12203a;
  --ink-2: #3c4a63;
  --muted: #66738a;
  --line: #e2e7ef;
  --wash: #f4f6fa;
  --paper: #ffffff;
  --navy: #0b2545;
  --navy-2: #13315c;
  --accent: #13809a;
  --cta: #e8772e;
  --cta-dark: #cf6420;
  --ok: #17663a;
  --ok-wash: #e4f4ea;
  --red: #b42318;
  --red-wash: #fdecea;
  --t-batteries: #13809a;
  --t-lithium: #5b5bd6;
  --t-gigafactories: #c46a1b;
  --t-sodium-ion: #2f8f5b;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(18, 32, 58, 0.06), 0 8px 24px rgba(18, 32, 58, 0.08);
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

img { max-width: 100%; display: block; }
a { color: var(--accent); }
code {
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 0.85em;
  background: var(--wash);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 6px;
  overflow-wrap: anywhere;
}
h1, h2, h3 { font-family: var(--serif); line-height: 1.2; color: var(--ink); }

.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 820px; }

/* ---------- buttons, tags ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 8px;
  border: 1px solid transparent;
  font: 600 0.95rem/1.2 var(--sans);
  text-decoration: none;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.btn-sm { padding: 8px 14px; font-size: 0.88rem; }
.btn-block { width: 100%; }
.btn-cta { background: var(--cta); color: #fff; }
.btn-cta:hover { background: var(--cta-dark); }
.btn-outline { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-outline:hover { border-color: var(--ink-2); }
.btn-light { background: rgba(255, 255, 255, 0.12); color: #fff; border-color: rgba(255, 255, 255, 0.35); }
.btn-light:hover { background: rgba(255, 255, 255, 0.2); }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.tag-light { color: #9fd9e3; }
.topic-text-batteries { color: var(--t-batteries); }
.topic-text-lithium { color: var(--t-lithium); }
.topic-text-gigafactories { color: var(--t-gigafactories); }
.topic-text-sodium-ion { color: var(--t-sodium-ion); }

.badge {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--wash);
  color: var(--ink-2);
  border: 1px solid var(--line);
  white-space: nowrap;
}
.badge-red { background: var(--red-wash); color: var(--red); border-color: #f6c9c4; }

.eyebrow { margin: 0 0 6px; font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); }
.eyebrow-light { color: #7fd3df; }
.link-arrow { font-weight: 600; color: var(--accent); }
.link-arrow::after { content: " \2192"; }

/* ---------- header ---------- */

#agent-banner {
  font-size: 0.9rem;
  padding: 10px 16px;
  text-align: center;
  background: var(--ok-wash);
  color: var(--ok);
  border-bottom: 1px solid #b9dfc6;
}

.topbar { background: var(--navy); color: #c7d3e6; font-size: 0.82rem; }
.topbar-inner { display: flex; justify-content: space-between; gap: 16px; padding-top: 7px; padding-bottom: 7px; flex-wrap: wrap; }
.topbar a { color: #fff; text-decoration: none; font-weight: 500; }
.topbar a:hover { text-decoration: underline; }

.site-header { border-bottom: 1px solid var(--line); background: #fff; position: sticky; top: 0; z-index: 20; }
.header-inner { display: flex; align-items: center; gap: 28px; padding-top: 14px; padding-bottom: 14px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--navy); text-decoration: none; font-size: 1.15rem; letter-spacing: 0.01em; white-space: nowrap; }
.brand b { font-weight: 700; }
.brand span { font-weight: 500; }
.logo { width: 32px; height: 32px; color: var(--navy); flex: none; }
.brand-light { color: #fff; }
.brand-light .logo { color: var(--accent); }
.main-nav { display: flex; gap: 24px; margin-left: auto; }
.main-nav a { color: var(--ink-2); text-decoration: none; font-weight: 500; font-size: 0.95rem; }
.main-nav a:hover { color: var(--accent); }

/* ---------- home ---------- */

.hero { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-2) 60%, #1b4a72 100%); color: #fff; }
.hero-inner { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: center; padding-top: 64px; padding-bottom: 64px; }
.hero h1 { color: #fff; font-size: clamp(2rem, 4vw, 2.9rem); margin: 0 0 16px; }
.hero .lede { color: #c7d3e6; font-size: 1.1rem; margin: 0 0 28px; max-width: 600px; }
.hero .eyebrow { color: #7fd3df; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero-panel { list-style: none; margin: 0; padding: 8px; background: rgba(255, 255, 255, 0.06); border: 1px solid rgba(255, 255, 255, 0.14); border-radius: 14px; }
.hero-panel li { display: flex; gap: 14px; align-items: flex-start; padding: 14px; border-radius: 10px; }
.hero-panel li + li { border-top: 1px solid rgba(255, 255, 255, 0.1); }
.hero-panel strong { display: block; color: #fff; }
.hero-panel span { color: #b6c4da; font-size: 0.9rem; }
.dot { width: 10px; height: 10px; border-radius: 50%; margin-top: 8px; flex: none; }
.dot.topic-batteries { background: #3fc1d6; }
.dot.topic-lithium { background: #9b9bff; }
.dot.topic-gigafactories { background: #f0a35e; }
.dot.topic-sodium-ion { background: #6fd39b; }

.trust-strip { border-bottom: 1px solid var(--line); background: #fff; }
.trust-inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 24px; padding-top: 16px; padding-bottom: 16px; color: var(--muted); font-size: 0.9rem; font-weight: 500; }
.trust-inner span::before { content: "\2713"; color: var(--accent); margin-right: 8px; font-weight: 700; }

.section { padding: 64px 0; }
.section-wash { background: var(--wash); }
.section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 24px; margin-bottom: 28px; flex-wrap: wrap; }
.section-head h2 { margin: 0; font-size: 2rem; }
.section-head > p { margin: 0; color: var(--muted); max-width: 420px; }

.report-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.report-card { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; color: inherit; background: #fff; transition: box-shadow 0.15s, transform 0.15s; }
.report-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
.report-card-body { padding: 18px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.report-card h3 { margin: 0; font-size: 1.15rem; }
.report-card p { margin: 0; color: var(--ink-2); font-size: 0.92rem; }
.meta { font-size: 0.8rem; color: var(--muted); font-weight: 500; }
.card-foot { margin-top: auto; padding-top: 10px; display: flex; justify-content: space-between; gap: 8px; font-size: 0.85rem; color: var(--muted); border-top: 1px solid var(--line); flex-wrap: wrap; }

.cover { position: relative; display: flex; flex-direction: column; gap: 8px; padding: 18px; min-height: 170px; color: #fff; background: var(--t-batteries); overflow: hidden; }
.cover::after { content: ""; position: absolute; right: -40px; bottom: -40px; width: 160px; height: 160px; border-radius: 50%; border: 22px solid rgba(255, 255, 255, 0.12); }
.cover.topic-lithium { background: var(--t-lithium); }
.cover.topic-gigafactories { background: var(--t-gigafactories); }
.cover.topic-sodium-ion { background: var(--t-sodium-ion); }
.cover-topic { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; opacity: 0.85; }
.cover-title { font-family: var(--serif); font-size: 1.15rem; font-weight: 600; line-height: 1.25; max-width: 90%; position: relative; z-index: 1; }
.cover-foot { margin-top: auto; font-size: 0.75rem; opacity: 0.8; position: relative; z-index: 1; }
.cover-sm { min-height: 110px; padding: 14px; }
.cover-sm .cover-title { font-size: 0.95rem; }

.insight-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.insight { display: flex; flex-direction: column; gap: 8px; padding: 22px; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); text-decoration: none; color: inherit; transition: box-shadow 0.15s; }
.insight:hover { box-shadow: var(--shadow); }
.insight h3 { margin: 0; font-size: 1.15rem; }
.insight p { margin: 0 0 6px; color: var(--ink-2); font-size: 0.92rem; }
.insight .link-arrow { margin-top: auto; font-size: 0.9rem; }

.agents-box { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: center; padding: 40px; border-radius: 16px; background: var(--navy); color: #c7d3e6; }
.agents-box h2 { color: #fff; margin: 0 0 12px; font-size: 1.9rem; }
.agents-box p { margin: 0; }
.agents-box code { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.2); color: #fff; }
.agent-steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; gap: 12px; }
.agent-steps li { counter-increment: step; display: grid; grid-template-columns: 36px 1fr; column-gap: 12px; padding: 14px; border-radius: 10px; background: rgba(255, 255, 255, 0.06); }
.agent-steps li::before { content: counter(step); grid-row: span 2; width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; background: var(--accent); color: #fff; font-weight: 700; }
.agent-steps strong { color: #fff; }
.agent-steps span { font-size: 0.9rem; }

/* ---------- breadcrumb, prose ---------- */

.breadcrumb { padding: 20px 0 8px; font-size: 0.85rem; color: var(--muted); }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 6px; color: #b3bccb; }

.prose { padding-bottom: 56px; }
.prose h1 { font-size: clamp(1.9rem, 3.5vw, 2.5rem); margin: 10px 0 12px; }
.prose h2 { font-size: 1.5rem; margin: 36px 0 10px; }
.prose p { color: var(--ink-2); font-size: 1.05rem; }
.byline { color: var(--muted) !important; font-size: 0.92rem !important; margin-top: 0; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.note { padding: 12px 16px; border-radius: 8px; background: var(--wash); font-size: 0.92rem !important; }
.pillars { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.pillars > div { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); }
.pillars h3 { margin: 0 0 6px; font-size: 1.1rem; }
.pillars p { margin: 0; font-size: 0.95rem; }

.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 48px; align-items: start; }
.article-cta { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 32px; padding: 20px; border-radius: var(--radius); background: var(--wash); border: 1px solid var(--line); }
.article-cta strong { display: block; }
.article-cta span { color: var(--muted); font-size: 0.92rem; }
.article-side { position: sticky; top: 90px; padding-top: 10px; }
.side-card { padding: 18px; border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
.side-card h3 { font-size: 1.05rem; margin: 12px 0 14px; }
.mini-preview { position: relative; display: block; border: 1px solid var(--line); border-radius: 6px; overflow: hidden; background: #fff; }
.mini-blur { display: block; height: 120px; overflow: hidden; }
.mini-blur img { width: 100%; filter: blur(1.5px); opacity: 0.85; }
.mini-lock { position: absolute; left: 50%; bottom: 36px; transform: translateX(-50%); width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center; background: var(--navy); color: #fff; box-shadow: var(--shadow); }
.mini-lock svg { width: 20px; height: 20px; }

/* ---------- report page ---------- */

.report-layout { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: 40px; align-items: start; padding-bottom: 40px; }
.report-head h1 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); margin: 8px 0 12px; }
.report-head .lede { color: var(--ink-2); font-size: 1.08rem; margin: 0 0 16px; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.chips li { font-size: 0.82rem; font-weight: 500; padding: 4px 10px; border-radius: 999px; background: var(--wash); border: 1px solid var(--line); color: var(--ink-2); }

.snapshot { margin-top: 28px; padding: 22px; border-radius: var(--radius); background: var(--wash); border: 1px solid var(--line); }
.snapshot h2 { font-size: 1.2rem; margin: 0 0 14px; }
.snapshot dl { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 0; }
.snapshot dl > div { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; }
.snapshot dt { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 600; }
.snapshot dd { margin: 2px 0 0; font-weight: 600; color: var(--ink); }

.preview { margin-top: 28px; }
.preview-doc { position: relative; max-width: 640px; margin: 0 auto; background: #fff; border: 1px solid var(--line); border-radius: 6px; box-shadow: var(--shadow); overflow: hidden; }
.preview-head { width: 100%; }
.preview-body { height: 520px; overflow: hidden; }
.preview-body img { width: 100%; filter: blur(2px); transform: scale(1.02); transform-origin: top center; user-select: none; -webkit-user-drag: none; }
.lock-overlay { position: absolute; left: 0; right: 0; bottom: 0; top: 34%; display: flex; align-items: center; justify-content: center; padding: 24px; background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.75) 22%, rgba(255, 255, 255, 0.92) 100%); }
.lock-card { max-width: 380px; text-align: center; padding: 28px 24px; background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); }
.lock-icon { width: 56px; height: 56px; margin: 0 auto 12px; border-radius: 50%; display: grid; place-items: center; background: var(--navy); color: #fff; }
.lock-icon svg { width: 26px; height: 26px; }
.lock-card h3 { margin: 0 0 6px; font-size: 1.3rem; }
.lock-card p { margin: 0 0 16px; color: var(--ink-2); font-size: 0.95rem; }
.lock-card .fine { margin: 12px 0 0; font-size: 0.85rem; color: var(--muted); }

.block { margin-top: 40px; }
.block h2 { font-size: 1.4rem; margin: 0 0 14px; }
.checks { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.checks li { display: flex; gap: 10px; align-items: flex-start; color: var(--ink-2); }
.checks svg, .assurances svg { width: 20px; height: 20px; flex: none; color: var(--accent); margin-top: 2px; }
.toc { list-style: none; padding: 0; margin: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.toc li { display: flex; align-items: center; gap: 12px; padding: 14px 16px; }
.toc li + li { border-top: 1px solid var(--line); }
.toc-num { width: 28px; height: 28px; flex: none; border-radius: 6px; display: grid; place-items: center; background: var(--wash); font-weight: 700; font-size: 0.85rem; color: var(--ink-2); }
.toc-title { font-weight: 500; }
.toc .badge { margin-left: 4px; }
.toc-lock { margin-left: auto; color: #9aa6b8; }
.toc-lock svg { width: 16px; height: 16px; }
.scope { display: grid; grid-template-columns: max-content 1fr; gap: 8px 20px; margin: 0 0 12px; }
.scope dt { font-weight: 600; }
.scope dd { margin: 0; color: var(--ink-2); }
.block > p { color: var(--ink-2); }

.report-side { position: sticky; top: 90px; display: grid; gap: 16px; padding-top: 8px; }
.buy-card { padding: 22px; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); background: #fff; }
.buy-card h3 { margin: 0 0 14px; font-size: 1.25rem; }
.licenses { display: grid; gap: 8px; margin-bottom: 16px; }
.license { display: flex; align-items: center; gap: 10px; padding: 12px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; }
.license:has(input:checked) { border-color: var(--accent); background: #eef8fa; }
.license input { accent-color: var(--accent); }
.license-text { flex: 1; display: flex; flex-direction: column; }
.license-text span { font-size: 0.8rem; color: var(--muted); }
.price { font-weight: 700; white-space: nowrap; }
.buy-card .btn + .btn { margin-top: 8px; }
.assurances { list-style: none; padding: 14px 0 0; margin: 16px 0 0; border-top: 1px solid var(--line); display: grid; gap: 6px; font-size: 0.88rem; color: var(--ink-2); }
.assurances li { display: flex; gap: 8px; align-items: center; }
.assurances svg { margin-top: 0; }
.agent-card { padding: 20px; border-radius: 14px; background: var(--navy); color: #c7d3e6; }
.agent-card h4 { margin: 6px 0 6px; color: #fff; font-size: 1.05rem; }
.agent-card p { margin: 0 0 10px; font-size: 0.9rem; }
.agent-card code { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.2); color: #fff; }

.related-wrap { padding: 24px 0 64px; border-top: 1px solid var(--line); }
.related-wrap h2 { font-size: 1.4rem; }
.related-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 16px; }
.related { display: flex; flex-direction: column; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; text-decoration: none; color: var(--ink); font-weight: 500; }
.related > span { padding: 12px 14px; font-size: 0.92rem; }
.related:hover { box-shadow: var(--shadow); }

/* ---------- footer, toast ---------- */

.site-footer { background: var(--navy); color: #b6c4da; font-size: 0.9rem; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1.5fr; gap: 32px; padding-top: 48px; padding-bottom: 32px; }
.site-footer h4 { color: #fff; margin: 4px 0 12px; font-size: 0.95rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.site-footer a { color: #b6c4da; text-decoration: none; }
.site-footer a:hover { color: #fff; }
.site-footer code { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.2); color: #fff; }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-top: 18px; padding-bottom: 24px; border-top: 1px solid rgba(255, 255, 255, 0.12); font-size: 0.8rem; }

.toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 50; max-width: calc(100% - 32px); padding: 12px 18px; border-radius: 10px; background: var(--ink); color: #fff; font-size: 0.92rem; box-shadow: var(--shadow); }

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .hero-inner, .agents-box, .report-layout, .article-layout { grid-template-columns: 1fr; }
  .report-side, .article-side { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .snapshot dl { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .header-inner { gap: 8px 12px; flex-wrap: wrap; padding-top: 10px; padding-bottom: 10px; }
  .header-inner > .btn { display: none; }
  .main-nav { gap: 18px; margin-left: 0; width: 100%; }
  .main-nav a { font-size: 0.88rem; }
  .brand { font-size: 1rem; }
  .hero-inner { padding-top: 40px; padding-bottom: 40px; }
  .section { padding: 44px 0; }
  .agents-box { padding: 24px; }
  .footer-grid { grid-template-columns: 1fr; }
  .snapshot dl { grid-template-columns: 1fr; }
  .preview-body { height: 380px; }
  .scope { grid-template-columns: 1fr; }
}