:root {
  --bg: #ffffff;
  --surface: #f7f7f7;
  --border: #e5e5e5;
  --text: #1a1a1a;
  --text-muted: #666666;
  --accent: #00d4aa;
  --accent-hover: #00b894;
  --success: #00d4aa;
  --error: #e74c3c;
  --link: #1a1a1a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--accent); }

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header: thin green top bar + clean white header */
.top-bar {
  height: 3px;
  background: var(--accent);
}

header {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.logo-mark {
  display: inline-flex;
  gap: 2px;
}

.logo-mark span {
  display: inline-block;
  width: 3px;
  height: 24px;
  background: var(--text);
  border-radius: 1px;
}

.logo-mark span:nth-child(1) { height: 14px; }
.logo-mark span:nth-child(2) { height: 20px; }
.logo-mark span:nth-child(3) { height: 24px; }
.logo-mark span:nth-child(4) { height: 20px; }
.logo-mark span:nth-child(5) { height: 14px; }

nav { display: flex; align-items: center; gap: 8px; }

nav a {
  color: var(--text-muted);
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 4px;
  transition: all 0.15s;
}

nav a:hover {
  color: var(--text);
  background: var(--surface);
}

/* Page title section (gray background like MIT Press) */
.page-banner {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 28px 0;
}

.page-banner h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.5px;
}

.page-banner p {
  color: var(--text-muted);
  font-size: 15px;
  margin-top: 6px;
}

/* Stats bar */
.stats-bar {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.stat-item {
  flex: 1;
  padding: 16px 20px;
  border-right: 1px solid var(--border);
  text-align: center;
}

.stat-item:last-child { border-right: none; }

.stat-item .num {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
}

.stat-item .lbl {
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 2px;
}

/* Section titles */
.section-title {
  font-size: 18px;
  font-weight: 700;
  margin: 32px 0 16px;
  color: var(--text);
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent);
  display: inline-block;
}

/* Table */
table {
  width: 100%;
  border-collapse: collapse;
}

th {
  text-align: left;
  padding: 10px 16px;
  font-size: 11px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
}

td {
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text);
}

td a { color: var(--text); }
td a:hover { color: var(--accent); }

tr:hover { background: var(--surface); }
tr:last-child td { border-bottom: none; }

.mono {
  font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
  font-size: 13px;
}

/* Detail panel */
.detail-panel {
  border: 1px solid var(--border);
  border-radius: 4px;
  margin: 20px 0;
  overflow: hidden;
}

.detail-panel .row {
  display: flex;
  padding: 10px 20px;
  border-bottom: 1px solid var(--border);
}

.detail-panel .row:last-child { border-bottom: none; }
.detail-panel .row:nth-child(even) { background: var(--surface); }

.detail-panel .label {
  width: 180px;
  color: var(--text-muted);
  flex-shrink: 0;
  font-size: 14px;
  font-weight: 500;
}

.detail-panel .value {
  font-family: 'SF Mono', Consolas, monospace;
  font-size: 13px;
  word-break: break-all;
  color: var(--text);
}

.detail-panel .value a { color: var(--text); }
.detail-panel .value a:hover { color: var(--accent); }

/* Navigation buttons */
.nav-buttons {
  display: flex;
  gap: 12px;
  margin: 16px 0;
}

.btn {
  display: inline-block;
  padding: 10px 24px;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
  border: none;
  font-weight: 600;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
  color: #fff;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* Faucet form */
.faucet-form {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 32px;
  max-width: 560px;
  margin: 24px auto;
  background: var(--bg);
}

.faucet-form input[type="text"] {
  width: 100%;
  padding: 12px 14px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
  font-family: 'SF Mono', Consolas, monospace;
  font-size: 14px;
  margin-bottom: 16px;
}

.faucet-form input[type="text"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(0,212,170,0.15);
}

/* Alerts */
.alert {
  padding: 12px 16px;
  border-radius: 4px;
  margin-bottom: 16px;
  font-size: 14px;
}

.alert-success {
  background: rgba(0,212,170,0.1);
  border: 1px solid var(--success);
  color: #008060;
}

.alert-error {
  background: rgba(231,76,60,0.1);
  border: 1px solid var(--error);
  color: var(--error);
}

/* Footer */
footer {
  text-align: center;
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 13px;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}

footer a { color: var(--text-muted); }
footer a:hover { color: var(--accent); }

/* Feature cards */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 24px 0;
}

.feature-card {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 20px;
  background: var(--bg);
}

.feature-card h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

.feature-card p {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.6;
}

/* Connect info */
.connect-section {
  margin: 32px 0;
}

@media (max-width: 768px) {
  .page-banner h1 { font-size: 22px; }
  .stats-bar { flex-wrap: wrap; }
  .stat-item { flex: 1 1 50%; border-bottom: 1px solid var(--border); }
  header .container { flex-direction: column; gap: 12px; }
  .detail-panel .row { flex-direction: column; gap: 4px; }
  .detail-panel .label { width: auto; }
}