/* ==========================================================================
   OurNetwork — ON-387: Ethereum
   Pure CSS, no framework
   ========================================================================== */

:root {
  --bg: #f2f2f2;
  --surface: #f7f7f7;
  --border: #e4e4e4;
  --border-strong: #dcdcdc;

  --ink-title: #2b1a4e;      /* deep purple headings */
  --ink-body: #4c4a56;       /* body grey */
  --ink-muted: #8b8892;      /* dates / subtle */
  --ink-strong: #221a33;

  --callout-bg: #eceaf4;
  --callout-bar: #c9c4dd;

  --radius-card: 14px;
  --radius-btn: 6px;

  --maxw: 680px;

  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-title: "Zilla Slab", "Roboto Slab", "Bitter", Georgia, "Times New Roman", serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-body);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
}

a:hover {
  color: var(--ink-title);
}

hr {
  border: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   HEADER
   ========================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 12px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  flex: 0 0 auto;
}

.brand-name {
  font-family: var(--font-body);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: #111014;
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 36px;
  padding: 0;
  background: #fbfbfb;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: background 0.15s ease;
}

.menu-toggle:hover {
  background: #f1f1f1;
}

.menu-toggle .bar {
  display: block;
  width: 17px;
  height: 1.5px;
  background: #16151a;
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.menu-toggle[aria-expanded="true"] .bar:nth-child(1) {
  transform: translateY(5.5px) rotate(45deg);
}
.menu-toggle[aria-expanded="true"] .bar:nth-child(2) {
  opacity: 0;
}
.menu-toggle[aria-expanded="true"] .bar:nth-child(3) {
  transform: translateY(-5.5px) rotate(-45deg);
}

.nav-menu {
  border-top: 1px solid var(--border);
  background: #f7f7f7;
}

.nav-menu[hidden] {
  display: none;
}

.nav-menu ul {
  max-width: 1180px;
  margin: 0 auto;
  padding: 8px 20px 14px;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.nav-menu a {
  display: block;
  padding: 9px 4px;
  font-size: 15px;
  color: var(--ink-body);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.nav-menu a:hover {
  color: var(--ink-title);
}

@media (min-width: 760px) {
  .nav-menu ul {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px 24px;
    padding-bottom: 12px;
  }
  .nav-menu a {
    border-bottom: 0;
    padding: 6px 0;
  }
}

/* ==========================================================================
   LAYOUT
   ========================================================================== */

.issue {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 34px 20px 0;
}

/* ---------- title block ---------- */

.issue-head {
  margin: 0 0 24px;
}

.issue-title {
  margin: 0 0 12px;
  font-family: var(--font-title);
  font-size: 40px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--ink-title);
  text-wrap: balance;
}

.title-emoji {
  font-family: var(--font-body);
  font-weight: 400;
}

.issue-sub {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.5;
  color: #6d6a78;
}

.issue-date {
  margin: 0;
  font-size: 13px;
  color: var(--ink-muted);
}

/* ---------- framed image cards ---------- */

.framed {
  margin: 0 0 18px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  overflow: hidden;
}

.framed.cover {
  margin-bottom: 16px;
}

.framed.banner {
  margin-top: 26px;
  margin-bottom: 26px;
}

.framed.chart {
  margin-top: 30px;
  margin-bottom: 30px;
  padding: 6px;
}

.framed.chart img {
  border-radius: 10px;
}

/* ---------- subscribe ---------- */

.subscribe-wrap {
  margin: 34px 0 10px;
  text-align: center;
}

.btn-subscribe {
  display: inline-block;
  padding: 12px 22px;
  background: #050506;
  color: #fff;
  border: 0;
  border-radius: var(--radius-btn);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.08s ease;
}

.btn-subscribe:hover {
  background: #26252b;
}

.btn-subscribe:active {
  transform: translateY(1px);
}

.btn-subscribe:focus-visible {
  outline: 2px solid #4bd9ac;
  outline-offset: 2px;
}

.subscribe-form {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 14px auto 0;
  max-width: 420px;
}

.subscribe-form[hidden] {
  display: none;
}

.subscribe-input {
  flex: 1 1 220px;
  min-width: 0;
  padding: 11px 13px;
  background: #fbfbfb;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-btn);
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--ink-strong);
}

.subscribe-input::placeholder {
  color: #a3a0aa;
}

.subscribe-input:focus {
  outline: none;
  border-color: #8d8a97;
}

.subscribe-input.invalid {
  border-color: #d8607a;
}

.btn-submit {
  flex: 0 0 auto;
  padding: 12px 18px;
}

.subscribe-msg {
  flex: 1 1 100%;
  margin: 2px 0 0;
  min-height: 18px;
  font-size: 13px;
  color: #6d6a78;
}

.subscribe-msg.error {
  color: #c14a63;
}

.subscribe-msg.ok {
  color: #1f9d6d;
}

/* ---------- rules ---------- */

.rule {
  height: 1px;
  margin: 34px 0;
  background: var(--border-strong);
}

.rule-tight {
  margin: 40px 0 30px;
}

.rule-double {
  margin-top: -20px;
}

/* ---------- prose ---------- */

.prose {
  margin: 26px 0;
}

.prose p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.62;
  color: var(--ink-body);
  text-wrap: pretty;
}

.prose p:last-child {
  margin-bottom: 0;
}

.prose.indented {
  padding-left: 22px;
}

.prose strong,
.note-head strong {
  color: var(--ink-strong);
  font-weight: 700;
}

.note-head {
  margin: 0 0 20px;
  font-size: 16px;
  color: var(--ink-strong);
}

.note-icon,
.callout-icon,
.takeaway-icon,
.byline-icon {
  font-family: var(--font-body);
}

/* ---------- callout (editor's note box) ---------- */

.callout {
  margin: 30px 0;
  padding: 20px 24px 22px;
  background: var(--callout-bg);
  border-left: 4px solid var(--callout-bar);
}

.callout-head {
  margin: 0 0 12px;
  font-size: 15px;
  color: var(--ink-strong);
}

.callout-body {
  margin: 0;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.6;
  color: #55525f;
}

/* ---------- sector blocks ---------- */

.sector {
  margin: 0;
}

.sector-title {
  margin: 0 0 26px;
  font-family: var(--font-title);
  font-size: 31px;
  line-height: 1.2;
  font-weight: 700;
  color: var(--ink-title);
  text-wrap: balance;
}

.byline {
  margin: 0 0 30px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink-strong);
}

.byline span:not(.byline-icon) {
  color: var(--ink-strong);
}

.takeaway {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.55;
  color: var(--ink-strong);
  text-wrap: pretty;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */

.site-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 20px 20px 56px;
}

.footer-banner {
  margin: 0;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

@media (max-width: 640px) {
  .issue {
    padding-top: 26px;
  }

  .issue-title {
    font-size: 31px;
  }

  .issue-sub {
    font-size: 16px;
  }

  .sector-title {
    font-size: 25px;
  }

  .prose p,
  .callout-body,
  .takeaway {
    font-size: 15px;
  }

  .prose.indented {
    padding-left: 12px;
  }

  .callout {
    padding: 16px 16px 18px;
  }

  .callout-body {
    padding-left: 12px;
  }

  .framed {
    border-radius: 10px;
  }

  .framed.chart {
    padding: 4px 4px 0;
  }

  .rule {
    margin: 28px 0;
  }

  .brand-name {
    font-size: 19px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}