:root {
  --ink: #0f1c18;
  --forest: #1a3c34;
  --teal: #2a6b5a;
  --mint: #c8e6d9;
  --paper: #f3f0e8;
  --paper-2: #e8e2d4;
  --line: rgba(15, 28, 24, 0.12);
  --ok: #1f6b45;
  --bad: #8b2e2e;
  --warn: #8a5a12;
  --shadow: 0 18px 40px rgba(15, 28, 24, 0.08);
  --radius: 14px;
  --font-display: "Literata", Georgia, serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(42, 107, 90, 0.18), transparent 60%),
    radial-gradient(900px 500px at 100% 0%, rgba(200, 230, 217, 0.55), transparent 55%),
    linear-gradient(180deg, #f7f4ec 0%, var(--paper) 40%, #ebe6da 100%);
}

.page {
  max-width: 1080px;
  margin: 0 auto;
  padding: 1.25rem 1.25rem 3rem;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0 1.25rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background: var(--forest);
  color: var(--mint);
  font-size: 1rem;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.9rem;
}

.nav a {
  color: var(--forest);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  opacity: 0.8;
}

.nav a:hover,
.nav a.is-active {
  opacity: 1;
  text-decoration: underline;
  text-underline-offset: 4px;
}

.hero {
  padding: 2.5rem 0 2rem;
  animation: rise 0.6s ease both;
}

.eyebrow {
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  color: var(--teal);
  font-weight: 600;
}

.hero-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.hero-lead {
  max-width: 36rem;
  margin: 1rem 0 1.5rem;
  font-size: 1.1rem;
  line-height: 1.55;
  color: rgba(15, 28, 24, 0.78);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

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

.btn-primary {
  background: var(--forest);
  color: #f4faf7;
}

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

.tools, .recent, .panel, .result-block {
  margin-top: 2rem;
  animation: rise 0.55s ease both;
}

.section-title, .panel h1, .result-block h2 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
}

.section-title {
  font-size: 1.45rem;
  margin: 0 0 1rem;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.9rem;
}

.tool {
  display: block;
  padding: 1.2rem 1.15rem;
  text-decoration: none;
  color: inherit;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.tool:hover {
  border-color: rgba(42, 107, 90, 0.45);
  transform: translateY(-2px);
}

.tool h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
}

.tool p {
  margin: 0;
  color: rgba(15, 28, 24, 0.72);
  line-height: 1.45;
  font-size: 0.95rem;
}

.panel, .result-block {
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 2px);
  padding: 1.4rem 1.35rem;
  box-shadow: var(--shadow);
}

.panel h1 {
  margin: 0 0 0.4rem;
  font-size: 1.9rem;
}

.panel-lead, .muted {
  color: rgba(15, 28, 24, 0.7);
  line-height: 1.5;
}

.form {
  display: grid;
  gap: 1rem;
  margin-top: 1.25rem;
}

.form label {
  display: grid;
  gap: 0.4rem;
  font-weight: 500;
  font-size: 0.92rem;
}

.form input[type="text"],
.form input[type="file"],
.form textarea,
.form select {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fffcf6;
  font: inherit;
  color: var(--ink);
}

.form textarea { resize: vertical; }
.form .narrow { max-width: 12rem; }

.paper-list, .cite-list, .task-list {
  display: grid;
  gap: 0.85rem;
  margin-top: 1rem;
  padding: 0;
  list-style: none;
}

.paper, .cite {
  padding: 1rem;
  border-radius: 12px;
  background: rgba(243, 240, 232, 0.65);
  border: 1px solid var(--line);
}

.paper h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-family: var(--font-display);
}

.paper h3 a { color: var(--forest); text-decoration: none; }
.paper h3 a:hover { text-decoration: underline; }

.paper-meta, .paper-doi, .paper-authors, .paper-abstract {
  margin: 0.25rem 0;
  font-size: 0.9rem;
  color: rgba(15, 28, 24, 0.75);
}

.rel-badge {
  display: inline-block;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  background: rgba(42, 107, 90, 0.14);
  color: var(--forest);
  font-weight: 600;
  font-size: 0.8rem;
}

.chart-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 0.75rem;
}

.chart {
  margin: 0;
  padding: 0.6rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.55);
}

.chart img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

.chart figcaption {
  margin-top: 0.45rem;
  font-size: 0.85rem;
  color: rgba(15, 28, 24, 0.7);
}

.cite.is-ok { border-left: 4px solid var(--ok); }
.cite.is-bad { border-left: 4px solid var(--bad); }
.cite-status { margin: 0 0 0.35rem; font-weight: 600; font-size: 0.85rem; }
.cite.is-ok .cite-status { color: var(--ok); }
.cite.is-bad .cite-status { color: var(--bad); }
.cite-input { margin: 0 0 0.5rem; font-size: 0.9rem; opacity: 0.85; }

.task-list a {
  display: grid;
  gap: 0.2rem;
  padding: 0.9rem 1rem;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.5);
}

.task-type {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--teal);
  font-weight: 600;
}

.task-title { font-weight: 600; }
.task-meta { font-size: 0.85rem; color: rgba(15, 28, 24, 0.6); }

.prose {
  line-height: 1.65;
  font-size: 1rem;
}

.prose h1, .prose h2, .prose h3 {
  font-family: var(--font-display);
  margin-top: 1.2em;
}

.prose ul, .prose ol { padding-left: 1.2rem; }

.stats {
  display: flex;
  gap: 1.5rem;
  margin: 1rem 0;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
}

.stat-label {
  font-size: 0.85rem;
  color: rgba(15, 28, 24, 0.65);
}

.flash-stack { display: grid; gap: 0.5rem; margin-bottom: 1rem; }

.flash {
  padding: 0.75rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.flash-success { border-color: rgba(31, 107, 69, 0.35); background: #eaf6ef; }
.flash-error, .flash-error { border-color: rgba(139, 46, 46, 0.35); background: #f8ecec; }

.code-block {
  white-space: pre-wrap;
  background: var(--paper-2);
  padding: 1rem;
  border-radius: 10px;
  overflow: auto;
  font-size: 0.9rem;
}

.subhead {
  margin-top: 1.5rem;
  font-family: var(--font-display);
}

.footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  color: rgba(15, 28, 24, 0.55);
  font-size: 0.85rem;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 640px) {
  .page { padding: 1rem 0.9rem 2.5rem; }
  .hero { padding-top: 1.5rem; }
}