:root {
  --ink: #14181c;
  --ink-soft: #3d454d;
  --paper: #f6f3ed;
  --paper-elevated: #fffdf8;
  --signal: #0d9488;
  --signal-dark: #0f766e;
  --border: rgba(20, 24, 28, 0.12);
  --shadow: 0 18px 50px rgba(20, 24, 28, 0.08);
  --radius: 12px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Source Sans 3", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
}

.ambient {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(13, 148, 136, 0.14), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(20, 24, 28, 0.06), transparent 50%);
  z-index: -1;
}

.container {
  width: min(1100px, 92vw);
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.85rem 0;
}

.brand {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-main {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  flex: 1;
}

.nav-main a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
}

.nav-main a:hover,
.nav-main a.active {
  color: var(--signal-dark);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.main {
  padding: 2rem 0 4rem;
  animation: fadeIn 0.35s ease;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.25rem 0 2.75rem;
  color: var(--ink-soft);
  font-size: 0.95rem;
  background:
    linear-gradient(180deg, color-mix(in srgb, var(--signal) 4%, transparent), transparent 40%),
    color-mix(in srgb, var(--paper-elevated) 70%, var(--paper));
}

.footer-shell {
  display: grid;
  gap: 1.25rem;
}

.footer-tagline {
  margin: 0;
  max-width: 36rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  line-height: 1.45;
  color: var(--ink);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.15rem;
}

.footer-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-weight: 500;
}

.footer-nav a:hover {
  color: var(--signal-dark);
}

.footer-copy {
  margin: 0;
  padding-top: 0.35rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
}

.static-page {
  max-width: 42rem;
}

.static-page p {
  margin: 0 0 1rem;
}

.hero {
  padding: 2.5rem 0 2rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.1;
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
}

.hero p {
  margin: 0;
  max-width: 36ch;
  color: var(--ink-soft);
  font-size: 1.15rem;
}

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.75rem 0 1.25rem;
}

input,
textarea,
select {
  font: inherit;
  color: var(--ink);
  background: var(--paper-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.75rem;
}

.password-wrap {
  display: flex;
  align-items: stretch;
  gap: 0.35rem;
}

.password-wrap input {
  flex: 1;
  min-width: 0;
}

.password-toggle {
  flex-shrink: 0;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--paper);
  color: var(--ink-soft);
  cursor: pointer;
}

.password-toggle:hover {
  border-color: var(--signal);
  color: var(--signal-dark);
}

input:focus,
textarea:focus,
select:focus {
  outline: 2px solid color-mix(in srgb, var(--signal) 35%, transparent);
  border-color: var(--signal);
}

textarea {
  min-height: 140px;
  resize: vertical;
  width: 100%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  font: inherit;
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.5rem 1rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease;
}

.btn:active {
  transform: scale(0.98);
}

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

.btn-primary:hover {
  background: var(--signal-dark);
}

.btn-ghost {
  background: transparent;
  border-color: var(--border);
  color: var(--ink);
}

.btn-ghost:hover {
  border-color: var(--signal);
  color: var(--signal-dark);
}

.btn-danger {
  background: #b91c1c;
  color: #fff;
}

.oauth-stack {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  margin-bottom: 0.25rem;
}

.btn-oauth {
  width: 100%;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}

.btn-google {
  background: #fff;
  border: 1px solid var(--border);
  color: var(--ink);
}

.btn-google:hover {
  border-color: #4285f4;
}

.btn-github {
  background: #24292f;
  color: #fff;
}

.btn-github:hover {
  background: #1b1f24;
}

.oauth-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink-soft);
  font-size: 0.85rem;
  margin: 1rem 0;
}

.oauth-divider::before,
.oauth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.oauth-divider span {
  flex-shrink: 0;
}

.oauth-error {
  color: #b91c1c;
  font-size: 0.92rem;
  margin: 0 0 1rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

.post-card {
  background: var(--paper-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 55px rgba(20, 24, 28, 0.12);
}

.post-card h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0 0 0.5rem;
  line-height: 1.25;
}

.post-card h2 a {
  color: inherit;
  text-decoration: none;
}

.post-card h2 a:hover {
  color: var(--signal-dark);
}

.post-meta {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.65rem;
}

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: lowercase;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--signal) 12%, transparent);
  color: var(--signal-dark);
  margin-right: 0.35rem;
}

.panel {
  background: var(--paper-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.25rem;
}

.panel h2,
.panel h3 {
  font-family: var(--font-display);
  margin-top: 0;
}

.form-stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  max-width: 420px;
}

.form-stack label {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 500;
  font-size: 0.92rem;
}

.form-stack label span.hint {
  font-weight: 400;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.article-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.article-body {
  margin-top: 1.5rem;
  line-height: 1.75;
}

.article-body h2,
.article-body h3 {
  font-family: var(--font-display);
}

.engagement-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0;
}

.engagement-bar .btn.active {
  background: color-mix(in srgb, var(--signal) 18%, transparent);
  border-color: var(--signal);
  color: var(--signal-dark);
}

.comments {
  margin-top: 2rem;
}

.comment {
  border-left: 3px solid color-mix(in srgb, var(--signal) 40%, transparent);
  padding: 0.75rem 0 0.75rem 1rem;
  margin-bottom: 1rem;
}

.comment-head {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-bottom: 0.35rem;
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.admin-tabs {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 0.65rem 0;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
}

.tabs a {
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  text-decoration: none;
  color: var(--ink-soft);
  border: 1px solid var(--border);
  font-size: 0.9rem;
}

.tabs a.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 1rem;
}

.stat {
  padding: 1rem;
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--signal) 8%, var(--paper-elevated));
  border: 1px solid var(--border);
}

.stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  padding: 0.65rem 0.5rem;
  border-bottom: 1px solid var(--border);
}

.empty {
  color: var(--ink-soft);
  padding: 2rem 0;
  text-align: center;
}

.toast-root {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--ink);
  color: var(--paper);
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
  animation: fadeIn 0.25s ease;
}

.toast.error {
  background: #991b1b;
}

.muted {
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.demo-section {
  margin: 1.75rem 0 2rem;
}

.section-title {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.45rem;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.chart-card h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}

.chart-sub {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
}

.chart-wrap {
  position: relative;
  height: 220px;
}

.chart-card:has(#chart-ua) .chart-wrap,
.chart-card:has(#chart-timezone) .chart-wrap,
.chart-card:has(#chart-referrer) .chart-wrap,
.chart-card:has(#chart-country) .chart-wrap,
.chart-card:has(#chart-city) .chart-wrap,
.chart-card:has(#chart-pages) .chart-wrap,
.chart-card:has(#chart-ips) .chart-wrap {
  height: 280px;
}

.chart-card:nth-child(1) {
  grid-column: 1 / -1;
}

.chart-card:nth-child(1) .chart-wrap {
  height: 260px;
}

@media (max-width: 640px) {
  .header-inner {
    flex-wrap: wrap;
  }
  .nav-main {
    order: 3;
    width: 100%;
  }
}