/* ═══════════════════════════════════════════════════════
   Project Brief — academic technical-report stylesheet
   Shares the BioTech Noir palette with the main site but
   adopts a restrained, paper-like document layout.
   ═══════════════════════════════════════════════════════ */

:root {
  --bg-deep: #06060c;
  --bg-primary: #0a0a12;
  --bg-elevated: #10101c;
  --bg-card-solid: #131320;
  --rule: #ffffff14;
  --rule-strong: #ffffff2a;

  --cyan: #00e5ff;
  --green: #39ff14;
  --magenta: #ff006e;
  --amber: #ffb300;
  --teal: #00d4aa;
  --violet: #a855f7;

  --text-primary: #e6e6ef;
  --text-secondary: #9a9ab0;
  --text-muted: #5f5f76;

  --font-display: "Syne", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --accent: var(--cyan);
}

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

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: #ffffff20 var(--bg-deep);
}

body {
  background: var(--bg-deep);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  background-image:
    radial-gradient(
      900px 500px at 85% -10%,
      color-mix(in srgb, var(--accent) 9%, transparent),
      transparent 70%
    ),
    linear-gradient(var(--rule) 1px, transparent 1px);
  background-size:
    auto,
    100% 3.2rem;
  background-attachment: fixed, fixed;
}

::selection {
  background: var(--accent);
  color: var(--bg-deep);
}

a {
  color: inherit;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 clamp(1.25rem, 5vw, 2.5rem);
}

/* --- Top bar --- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg-deep) 78%, transparent);
  border-bottom: 1px solid var(--rule);
}
.topbar-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0.85rem clamp(1.25rem, 5vw, 2.5rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}
.back-link:hover {
  color: var(--accent);
}
.back-link svg {
  width: 15px;
  height: 15px;
}
.topbar-id {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

/* --- Header --- */
.brief-header {
  padding: clamp(3rem, 8vw, 5rem) 0 2rem;
  border-bottom: 1px solid var(--rule);
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.4rem;
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--accent);
}

.brief-headline {
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}
.brief-icon {
  flex: 0 0 auto;
  width: 60px;
  height: 60px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}
.brief-icon svg {
  width: 32px;
  height: 32px;
}
.brief-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.05;
  letter-spacing: -0.01em;
}
.brief-subtitle {
  font-size: clamp(1rem, 2.6vw, 1.18rem);
  color: var(--text-secondary);
  margin-top: 0.5rem;
}
.badge {
  display: inline-block;
  margin-bottom: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.6rem;
  border-radius: 5px;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
}

/* --- Meta strip --- */
.meta-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  border-radius: 10px;
  overflow: hidden;
  margin: 2rem 0 0;
}
.meta-cell {
  background: var(--bg-primary);
  padding: 1rem 1.15rem;
}
.meta-label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.meta-value {
  font-size: 0.92rem;
  margin-top: 0.3rem;
  color: var(--text-primary);
}
.meta-value a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s;
}
.meta-value a:hover {
  border-color: var(--accent);
}

/* --- Sections --- */
section.brief {
  padding: 2.6rem 0;
  border-bottom: 1px solid var(--rule);
}
section.brief:last-of-type {
  border-bottom: none;
}
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.section-eyebrow span.num {
  color: var(--accent);
}
.brief h2 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.4rem;
  margin-bottom: 0.9rem;
  letter-spacing: -0.005em;
}
.abstract {
  font-size: 1.05rem;
  color: var(--text-secondary);
}
.abstract strong {
  color: var(--text-primary);
  font-weight: 600;
}

ul.highlights {
  list-style: none;
  display: grid;
  gap: 0.85rem;
}
ul.highlights li {
  position: relative;
  padding-left: 1.6rem;
  color: var(--text-secondary);
}
ul.highlights li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 8px color-mix(in srgb, var(--accent) 60%, transparent);
}
ul.highlights li strong {
  color: var(--text-primary);
  font-weight: 600;
}

.arch {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  line-height: 1.9;
  color: var(--text-secondary);
  background: var(--bg-primary);
  border: 1px solid var(--rule);
  border-left: 2px solid var(--accent);
  border-radius: 8px;
  padding: 1.2rem 1.35rem;
  white-space: pre-wrap;
  overflow-x: auto;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}
.tag {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  color: var(--text-secondary);
  background: var(--bg-card-solid);
  border: 1px solid var(--rule);
}

/* --- Notebooks --- */
.nb-list {
  display: grid;
  gap: 0.75rem;
}
.nb-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--rule);
  border-radius: 9px;
  background: var(--bg-primary);
  text-decoration: none;
  color: inherit;
  transition:
    border-color 0.2s ease,
    transform 0.2s ease;
}
.nb-item.live:hover {
  border-color: color-mix(in srgb, var(--accent) 55%, transparent);
  transform: translateX(3px);
}
.nb-item.stub {
  opacity: 0.55;
  cursor: default;
}
.nb-meta {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}
.nb-icon {
  width: 30px;
  height: 30px;
  flex: 0 0 auto;
  color: var(--accent);
}
.nb-name {
  font-family: var(--font-mono);
  font-size: 0.9rem;
}
.nb-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 0.15rem;
}
.nb-status {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--accent);
  white-space: nowrap;
}
.nb-status.muted {
  color: var(--text-muted);
}

/* --- Footer --- */
.brief-footer {
  padding: 2.5rem 0 4rem;
}
.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
}
.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.02em;
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  text-decoration: none;
  transition:
    transform 0.2s ease,
    border-color 0.2s ease,
    background 0.2s ease;
}
.cta-primary {
  color: var(--bg-deep);
  background: var(--accent);
  font-weight: 600;
}
.cta-primary:hover {
  transform: translateY(-2px);
}
.cta-ghost {
  color: var(--text-secondary);
  border: 1px solid var(--rule-strong);
}
.cta-ghost:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.cta svg {
  width: 16px;
  height: 16px;
}
.colophon {
  margin-top: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

@media (max-width: 560px) {
  .brief-headline {
    flex-direction: column;
    gap: 1rem;
  }
  .nb-item {
    flex-direction: column;
    align-items: flex-start;
  }
}