body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  max-width: 600px;
  margin: 0 auto;
  padding: 0 20px 80px;
  line-height: 1.6;
  color: #222;
  background: #fff;
}

/* Wider layout for content-heavy pages (e.g. the Earthquake page's
   side-by-side lists) — other pages keep the narrower reading width. */
body.wide {
  max-width: 1080px;
}

h1 {
  margin-bottom: 20px;
}

nav {
  display: flex;
  gap: 24px;
  padding: 30px 0;
  margin-bottom: 50px;
  border-bottom: 1px solid #e5e5e5;
}

nav a {
  color: #555;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover,
nav a.active {
  color: #222;
  text-decoration: underline;
}

.nav-dropdown {
  position: relative;
}

.nav-dropdown-toggle {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  color: #555;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
}

.nav-dropdown-toggle:hover {
  color: #222;
  text-decoration: underline;
}

.nav-dropdown.active .nav-dropdown-toggle {
  color: #222;
  text-decoration: underline;
}

.nav-dropdown-toggle::after {
  content: "▾";
  font-size: 0.7em;
  margin-left: 4px;
}

.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 12px;
  background: #fff;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  min-width: 190px;
  padding: 6px;
  z-index: 20;
}

.nav-dropdown.open .nav-dropdown-menu {
  display: block;
}

.nav-dropdown-menu a {
  display: block;
  padding: 8px 10px;
  border-radius: 6px;
  color: #555;
  text-decoration: none;
  font-weight: 500;
  font-size: 0.92rem;
}

.nav-dropdown-menu a:hover,
.nav-dropdown-menu a.active {
  background: #f5f5f5;
  color: #222;
}

.post-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-list li {
  padding: 18px 0;
  border-bottom: 1px solid #e5e5e5;
}

.post-list li:first-child {
  padding-top: 0;
}

.post-list .post-date {
  font-size: 0.85rem;
  color: #888;
}

.post-list h2 {
  font-size: 1.15rem;
  margin: 4px 0 0;
}

.post-list h2 a {
  color: #222;
}

.empty-state {
  color: #888;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
}

.contact-list li {
  margin-bottom: 12px;
}

.contact-list a {
  font-weight: 500;
}

#clock {
  text-align: center;
  padding-bottom: 36px;
  margin-bottom: 40px;
  border-bottom: 1px solid #e5e5e5;
}

#clock-time {
  font-size: 3rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}

#clock-date {
  font-size: 1.05rem;
  color: #555;
  margin-top: 4px;
}

#clock-iso {
  font-size: 0.75rem;
  color: #999;
  margin-top: 6px;
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}

#bg-rgb {
  font-size: 0.72rem;
  color: #b5b5b5;
  margin-top: 4px;
  font-variant-numeric: tabular-nums;
}

#tz-select {
  display: block;
  margin: 14px auto 0;
  max-width: 100%;
  font-size: 0.9rem;
  padding: 4px 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  background: #fff;
  color: #222;
}

.clock-caption {
  color: #888;
  font-size: 0.95rem;
}

.time-since {
  font-size: 0.85rem;
  color: #888;
  margin: 4px 0 0;
  font-variant-numeric: tabular-nums;
}

.like-widget {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 30px 0;
}

.like-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid #ccc;
  background: #fff;
  color: #555;
  cursor: pointer;
}

.like-btn:hover {
  border-color: #999;
}

.like-btn.liked {
  background: #222;
  border-color: #222;
  color: #fff;
}

.like-btn:disabled {
  cursor: default;
}

.like-count {
  font-size: 0.85rem;
  color: #888;
}

footer {
  margin-top: 60px;
  padding-top: 16px;
  border-top: 1px solid #e5e5e5;
  text-align: center;
  color: #999;
  font-size: 0.8rem;
}

footer p {
  margin: 0 0 6px;
}

footer p:last-child {
  margin-bottom: 0;
}

/* ---------- earthquake page ---------- */

main h2 {
  margin: 36px 0 12px;
  font-size: 1.2rem;
}

main ul:not(.quake-list) {
  padding-left: 20px;
  margin: 0 0 16px;
}

main ul:not(.quake-list) li {
  margin-bottom: 8px;
}

.section-note {
  color: #888;
  font-size: 0.88rem;
  margin: -6px 0 14px;
}

/* ---------- live waveform panel ---------- */

.seis-panel {
  background: #020405;
  border: 1px solid #1a2530;
  border-radius: 8px;
  overflow: hidden;
  margin: 16px 0 24px;
  font-family: "SF Mono", "Share Tech Mono", monospace;
}

.seis-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: #0a1218;
  border-bottom: 1px solid #1a2530;
  flex-wrap: wrap;
}

.seis-title {
  color: #58c4ff;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.seis-sub {
  color: #4a6070;
  font-size: 0.72rem;
}

.seis-status {
  margin-left: auto;
  font-size: 0.72rem;
  color: #6e7681;
}

.seis-status.ok {
  color: #00d472;
}

.seis-status.err {
  color: #f85149;
}

#seis-canvas {
  display: block;
  width: 100%;
  height: 160px;
}

.seis-footer {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: #0a1218;
  border-top: 1px solid #1a2530;
  color: #4a6070;
  font-size: 0.7rem;
  flex-wrap: wrap;
}

.seis-footer a {
  color: #58c4ff;
}

.seis-sep {
  color: #1e3a4a;
}

.seis-win-btns {
  display: flex;
  gap: 4px;
}

.seis-win-btn {
  font-family: inherit;
  font-size: 0.68rem;
  padding: 3px 8px;
  border-radius: 3px;
  border: 1px solid #1e3a4a;
  background: none;
  color: #4a6070;
  cursor: pointer;
}

.seis-win-btn:hover {
  border-color: #58c4ff;
  color: #58c4ff;
}

.seis-win-btn.active {
  background: #10344a;
  border-color: #58c4ff;
  color: #58c4ff;
}

.seis-stalta {
  color: #00d472;
  font-weight: 700;
}

.seis-stalta-max-block {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.seis-stalta-max {
  color: #d9a840;
  font-weight: 700;
}

.seis-stalta-max-time {
  font-size: 0.62rem;
  color: #3a5568;
}

.seis-range {
  margin-left: auto;
  color: #2a5060;
}

.esp32-legend {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.esp32-swatch {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 2px;
}

.esp32-swatch-x { background: #ff5c5c; }
.esp32-swatch-y { background: #5cff8f; }
.esp32-swatch-z { background: #5c9fff; }

.mag-filter {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.mag-filter button {
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 999px;
  border: 1px solid #ccc;
  background: #fff;
  color: #555;
  cursor: pointer;
}

.mag-filter button:hover {
  border-color: #999;
}

.mag-filter button.active {
  background: #222;
  border-color: #222;
  color: #fff;
}

.quake-list {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
}

.quake-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid #eee;
}

.quake-mag {
  flex-shrink: 0;
  min-width: 44px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 3px 6px;
  border-radius: 6px;
  color: #fff;
}

.quake-mag.mag-minor { background: #9aa5b1; }
.quake-mag.mag-moderate { background: #4a90d9; }
.quake-mag.mag-strong { background: #d98e2e; }
.quake-mag.mag-major { background: #c0392b; }

.quake-info {
  flex: 1;
  min-width: 0;
}

.quake-place {
  font-size: 0.95rem;
}

.quake-meta {
  font-size: 0.8rem;
  color: #888;
  margin-top: 2px;
}

.quake-link {
  flex-shrink: 0;
  font-size: 0.82rem;
  white-space: nowrap;
}

.quake-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}

.quake-column h2 {
  margin-top: 0;
}

.show-more-btn {
  display: block;
  width: 100%;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 9px 0;
  margin-top: 4px;
  border-radius: 8px;
  border: 1px solid #ccc;
  background: #fff;
  color: #555;
  cursor: pointer;
}

.show-more-btn:hover {
  border-color: #999;
  color: #222;
}

@media (max-width: 800px) {
  .quake-columns {
    grid-template-columns: 1fr;
    gap: 0;
  }
}