:root {
  --bg: #0f1316;
  --surface: rgba(255, 255, 255, 0.08);
  --surface-strong: rgba(255, 255, 255, 0.14);
  --text: #f5f3ef;
  --muted: rgba(245, 243, 239, 0.65);
  --accent: #6ed3c1;
  --accent-2: #f4b860;
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
  --radius: 20px;
  --max: 1200px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "Space Grotesk", "DM Sans", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  min-height: 100%;
}

html {
  scroll-behavior: smooth;
}

body {
  background-image: radial-gradient(circle at 10% 20%, rgba(110, 211, 193, 0.2), transparent 50%),
    radial-gradient(circle at 80% 10%, rgba(244, 184, 96, 0.25), transparent 55%),
    radial-gradient(circle at 50% 80%, rgba(145, 159, 255, 0.2), transparent 60%);
}

a {
  color: inherit;
}

.app {
  position: relative;
  padding: 36px 24px 80px;
}

.header {
  max-width: var(--max);
  margin: 0 auto 32px;
  padding: 28px 32px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02));
  border: 1px solid var(--border);
  border-radius: 28px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.identity {
  display: flex;
  align-items: center;
  gap: 14px;
}

.avatar {
  width: 56px;
  height: 56px;
  border-radius: 999px;
  border: 1px solid var(--border);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
  object-fit: cover;
}

.eyebrow {
  display: block;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.65rem;
  color: var(--muted);
}

.name {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  margin-top: 4px;
}

.nav {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

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

.brand {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}

.brand h1 {
  font-family: "Newsreader", "Noto Serif", serif;
  font-size: 2.4rem;
  letter-spacing: 0.02em;
  margin: 0;
}

.brand p {
  margin: 8px 0 0;
  color: var(--muted);
  max-width: 520px;
}

.metrics {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.metric {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: 16px;
  min-width: 140px;
}

.metric span {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
}

.metric strong {
  font-size: 1.2rem;
}

.layout {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 28px;
}

.sidebar {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  position: sticky;
  top: 24px;
  height: fit-content;
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.sidebar h2 {
  margin: 0 0 12px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.search {
  width: 100%;
  background: rgba(15, 19, 22, 0.6);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 12px 14px;
  border-radius: 14px;
  margin-bottom: 20px;
  font-size: 0.95rem;
}

.sort {
  width: 100%;
  background: rgba(15, 19, 22, 0.6);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: 14px;
  margin-bottom: 16px;
}

.chip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chip {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 12px;
  background: rgba(15, 19, 22, 0.6);
  color: var(--text);
  display: flex;
  gap: 8px;
  align-items: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.chip:hover {
  transform: translateY(-1px);
  background: var(--surface-strong);
}

.chip.active {
  background: linear-gradient(135deg, rgba(110, 211, 193, 0.4), rgba(244, 184, 96, 0.3));
  border-color: rgba(110, 211, 193, 0.6);
}

.chip-count {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 0.75rem;
  color: var(--muted);
}

.content {
  min-height: 60vh;
}

.cards {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.empty {
  grid-column: 1 / -1;
  padding: 28px;
  border-radius: 18px;
  border: 1px dashed var(--border);
  background: rgba(15, 19, 22, 0.5);
  color: var(--muted);
  font-size: 0.95rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px 20px;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: transform 0.2s ease, border-color 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.card:hover {
  transform: translateY(-4px);
  border-color: rgba(110, 211, 193, 0.6);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--muted);
}

.badge {
  background: rgba(110, 211, 193, 0.2);
  color: #bdf1e7;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 0.75rem;
}

.card h3 {
  margin: 0;
  font-size: 1.15rem;
}

.card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  background: rgba(110, 211, 193, 0.18);
  color: rgba(245, 243, 239, 0.85);
  border: 1px solid rgba(110, 211, 193, 0.4);
  padding: 3px 8px;
  border-radius: 999px;
  font-size: 0.72rem;
}

.card-footer {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: rgba(245, 243, 239, 0.5);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  color: var(--muted);
}

.reader {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 28px;
  padding: 32px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.reader-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 28px;
}

.reader-toc {
  background: rgba(15, 19, 22, 0.6);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 16px;
  position: sticky;
  top: 24px;
  height: fit-content;
}

.toc-title {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.7rem;
  color: var(--muted);
  margin-bottom: 12px;
}

.toc-link {
  display: block;
  color: rgba(245, 243, 239, 0.72);
  text-decoration: none;
  font-size: 0.85rem;
  line-height: 1.5;
  margin-bottom: 8px;
}

.toc-link:hover {
  color: var(--text);
}

.toc-level-2 {
  padding-left: 8px;
}

.toc-level-3 {
  padding-left: 16px;
}

.reader h1,
.reader h2,
.reader h3,
.reader h4 {
  font-family: "Newsreader", "Noto Serif", serif;
  margin-top: 28px;
}

.reader p {
  line-height: 1.7;
  color: rgba(245, 243, 239, 0.8);
}

.reader pre {
  background: rgba(20, 26, 32, 0.72);
  padding: 16px;
  border-radius: 12px;
  overflow: auto;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.hljs,
.reader pre code.hljs {
  background: transparent;
}

.reader code {
  font-family: "JetBrains Mono", "SFMono-Regular", monospace;
  font-size: 0.9em;
}

.reader blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin: 20px 0;
  color: rgba(245, 243, 239, 0.75);
}

.reader img {
  max-width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  margin: 12px 0;
}

.reader hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 28px 0;
}

.reader table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 26px;
  font-size: 0.95rem;
}

.reader th,
.reader td {
  border: 1px solid var(--border);
  padding: 10px 12px;
}

.reader th {
  background: rgba(255, 255, 255, 0.08);
  text-align: left;
}

.reader tbody tr:nth-child(even) td {
  background: rgba(255, 255, 255, 0.04);
}

.back {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 16px;
  border-radius: 999px;
  cursor: pointer;
  margin-bottom: 18px;
}

.hidden {
  display: none;
}

.fade-in {
  animation: fadeIn 0.5s ease both;
}

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

@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

  .reader-grid {
    grid-template-columns: 1fr;
  }

  .reader-toc {
    display: none;
  }
}

@media (max-width: 600px) {
  .header {
    padding: 22px;
  }

  .brand h1 {
    font-size: 2rem;
  }
}