/*
 * Crucible — Inference Foundry Research Journal
 * Professional light theme; aligns with inference-foundry.github.io
 */

:root {
  --color-bg: #fafbfc;
  --color-surface: #ffffff;
  --color-border: #e2e8f0;
  --color-text: #334155;
  --color-heading: #1e3a5f;
  --color-muted: #64748b;
  --color-accent: #0891b2;
  --color-accent-hover: #0e7490;
  --color-accent-soft: rgba(8, 145, 178, 0.1);
  --color-wip: #059669;
  --color-wip-bg: rgba(5, 150, 105, 0.1);
  --color-queued: #d97706;
  --color-queued-bg: rgba(217, 119, 6, 0.1);
  --color-done: #0284c7;
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", ui-monospace, monospace;
  --max-width: 1120px;
  --content-width: 780px;
  --header-height: 68px;
  --radius: 12px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 24px rgba(15, 23, 42, 0.08);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.65;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

::selection {
  background: var(--color-accent-soft);
  color: var(--color-heading);
}

.skip-link {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link:focus {
  position: fixed;
  left: 1rem;
  top: 1rem;
  width: auto;
  height: auto;
  margin: 0;
  padding: 0.75rem 1rem;
  overflow: visible;
  clip: auto;
  background: var(--color-accent);
  color: #fff !important;
  text-decoration: none;
  border-radius: 8px;
  z-index: 10001;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--color-heading);
}

h1 { font-size: 1.75rem; }
h2 {
  font-size: 1.35rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-bottom: 1.25rem;
  margin-top: 2.5rem;
}
h3 { font-size: 1.05rem; margin-top: 1.5rem; margin-bottom: 0.5rem; color: var(--color-heading); }
h4 { font-size: 0.875rem; color: var(--color-muted); text-transform: uppercase; letter-spacing: 0.06em; margin-top: 1rem; margin-bottom: 0.35rem; }

p { margin-bottom: 1rem; }

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease;
}
a:hover { color: var(--color-accent-hover); }

strong { font-weight: 600; color: var(--color-heading); }
em { font-style: italic; color: var(--color-muted); }

ul, ol { padding-left: 1.25rem; margin-bottom: 1rem; }
li { margin-bottom: 0.35rem; }

code {
  font-family: var(--font-mono);
  font-size: 0.84em;
  background: #f1f5f9;
  color: #0f172a;
  padding: 0.12em 0.35em;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

pre {
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  padding: 1rem;
  overflow-x: auto;
  margin-bottom: 1rem;
  line-height: 1.5;
  border-radius: 0 var(--radius) var(--radius) 0;
}

pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.82rem;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Header */
.site-header {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  padding: 0 1.25rem;
  position: sticky;
  top: 0;
  z-index: 100;
  min-height: var(--header-height);
  display: flex;
  align-items: center;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.65rem 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}
.brand:hover { color: inherit; }

.brand__logo {
  width: 40px;
  height: 40px;
  object-fit: contain;
  border-radius: 8px;
}

.brand__text { display: flex; flex-direction: column; line-height: 1.15; }
.brand__name {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: var(--color-heading);
}
.brand__tag {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--color-muted);
}

.site-logo {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: 0.06em;
  text-decoration: none;
  border: none;
}
.site-logo:hover { color: var(--color-accent-hover); border: none; }

.site-tagline {
  font-size: 0.78rem;
  color: var(--color-muted);
  max-width: 320px;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.header-links a {
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.45rem 0.65rem;
  border-radius: 8px;
  text-decoration: none;
  color: var(--color-text);
}

.header-links a:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent-hover);
}

.btn-nav {
  background: var(--color-accent);
  color: #fff !important;
  font-weight: 600;
}
.btn-nav:hover {
  background: var(--color-accent-hover);
  color: #fff !important;
}

/* Hero */
.hero {
  background:
    radial-gradient(ellipse 70% 50% at 80% -10%, rgba(8, 145, 178, 0.12), transparent),
    var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  padding: clamp(2.5rem, 6vw, 4rem) 1.25rem;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 880px) {
  .hero-inner {
    grid-template-columns: minmax(200px, 280px) 1fr;
  }
}

.hero-visual {
  display: flex;
  justify-content: center;
}

.hero-logo-card {
  background: var(--color-surface);
  padding: 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
  max-width: 260px;
}

.hero-logo-card img {
  width: 100%;
  max-height: 140px;
  object-fit: contain;
}

.hero-copy .hero-lead {
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-heading);
  margin-bottom: 1rem;
  border-left: 4px solid var(--color-accent);
  padding-left: 1rem;
}

.hero-sub {
  font-size: 1rem;
  color: var(--color-muted);
  margin-bottom: 1.75rem;
  max-width: 52ch;
}

.hero-stats {
  display: flex;
  gap: clamp(1.25rem, 4vw, 2.5rem);
  flex-wrap: wrap;
}

.stat-block {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-num {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1;
}

.stat-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Journal strip */
.journal-strip {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
}

.journal-strip__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  gap: 1rem;
}

@media (min-width: 720px) {
  .journal-strip__inner {
    grid-template-columns: repeat(3, 1fr);
  }
}

.journal-strip article {
  padding: 1rem 1.15rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.journal-strip h3 {
  margin: 0 0 0.35rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.journal-strip p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.5;
}

/* Filter toolbar */
.filter-bar-section {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.25rem;
  position: sticky;
  top: var(--header-height);
  z-index: 90;
  box-shadow: 0 4px 12px rgba(15, 23, 42, 0.04);
}

.filter-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.search-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.search-row label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.search-input-wrap {
  position: relative;
  max-width: 420px;
}

.search-input-wrap input {
  width: 100%;
  padding: 0.65rem 0.85rem 0.65rem 2.5rem;
  font-family: inherit;
  font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
}

.search-input-wrap input::placeholder {
  color: #94a3b8;
}

.search-input-wrap svg {
  position: absolute;
  left: 0.75rem;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  opacity: 0.45;
  pointer-events: none;
}

.filter-row {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding-top: 0.35rem;
  flex-shrink: 0;
}

.filter-controls {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

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

.filter-btn.active {
  color: #fff;
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.results-meta {
  font-size: 0.8125rem;
  color: var(--color-muted);
  min-height: 1.25rem;
}

/* Article listing */
.article-listing {
  padding: 2.5rem 1.25rem 3rem;
  flex: 1;
}

.listing-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.listing-group {
  margin-bottom: 2.5rem;
}

.listing-group-title {
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 0.65rem;
  margin-bottom: 1.25rem;
  margin-top: 0;
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.article-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #cbd5e1;
}

.article-card.status-wip {
  border-left: 4px solid var(--color-wip);
}

.article-card.status-queued {
  border-left: 4px solid var(--color-queued);
}

.article-card.status-done {
  border-left: 4px solid var(--color-done);
}

.article-card[hidden] {
  display: none !important;
}

.card-meta-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
  flex-wrap: wrap;
}

.card-type {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.card-status,
.card-date,
.card-priority {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
}

.status-wip-badge {
  color: var(--color-wip);
  background: var(--color-wip-bg);
  border: 1px solid rgba(5, 150, 105, 0.35);
}

.status-queued-badge {
  color: var(--color-queued);
  background: var(--color-queued-bg);
  border: 1px solid rgba(217, 119, 6, 0.35);
}

.status-done-badge {
  color: var(--color-done);
  background: rgba(2, 132, 199, 0.1);
  border: 1px solid rgba(2, 132, 199, 0.35);
}

.card-date,
.card-priority {
  color: var(--color-muted);
  background: #f8fafc;
  border: 1px solid var(--color-border);
}

.card-title {
  font-size: 1.08rem;
  font-weight: 700;
  margin: 0.5rem 0 0.35rem;
  color: var(--color-heading);
  line-height: 1.35;
}

.card-citation {
  font-size: 0.8125rem;
  color: var(--color-muted);
  margin-bottom: 0.65rem;
  font-style: italic;
}

.card-summary {
  font-size: 0.9rem;
  color: var(--color-text);
  margin-bottom: 0.65rem;
  line-height: 1.65;
}

.card-hardware {
  margin-bottom: 0.65rem;
}

.card-hardware code {
  font-size: 0.78rem;
  color: var(--color-muted);
}

.card-tags {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.card-actions {
  margin-top: 0.65rem;
}

.card-link-placeholder {
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-style: italic;
}

.tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  border: 1px solid var(--color-border);
  padding: 0.15rem 0.45rem;
  border-radius: 6px;
  background: #f8fafc;
  user-select: none;
}

.no-results {
  max-width: var(--max-width);
  margin: 2rem auto;
  padding: 2.5rem 1.25rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.9375rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
}

.no-results[hidden] {
  display: none !important;
}

/* Article pages */
.article-container {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
  flex: 1;
}

.article-header {
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.article-meta-line {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.article-type {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-muted);
  letter-spacing: 0.06em;
}

.article-date {
  font-size: 0.75rem;
  color: var(--color-muted);
}

.article-title {
  font-size: clamp(1.35rem, 3vw, 1.75rem);
  line-height: 1.25;
  margin-bottom: 0.5rem;
}

.article-subtitle {
  font-size: 0.875rem;
  color: var(--color-muted);
  font-style: italic;
  margin-bottom: 1rem;
}

.article-authors,
.profiling-hardware {
  font-size: 0.875rem;
  color: var(--color-text);
  margin-bottom: 0.5rem;
}

.article-tags {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

article section {
  margin-bottom: 2rem;
}

article section h2 {
  color: var(--color-heading);
}

.notation-list {
  list-style: none;
  padding-left: 0;
  font-size: 0.9rem;
}

.notation-list li {
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text);
}

.notation-list li:last-child {
  border-bottom: none;
}

.profiling-env-box {
  background: #f8fafc;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  padding: 1rem;
  margin-bottom: 1.5rem;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.profiling-env-box h3 {
  margin-top: 0;
  font-size: 0.875rem;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.table-wrapper {
  overflow-x: auto;
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
}

.profiling-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8125rem;
}

.profiling-table caption {
  caption-side: top;
  font-size: 0.75rem;
  color: var(--color-muted);
  text-align: left;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--color-border);
  background: #f8fafc;
}

.profiling-table th {
  background: #f1f5f9;
  color: var(--color-heading);
  font-weight: 600;
  text-align: left;
  padding: 0.55rem 1rem;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  white-space: nowrap;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.profiling-table th:last-child {
  border-right: none;
}

.profiling-table td {
  padding: 0.5rem 1rem;
  border-bottom: 1px solid var(--color-border);
  border-right: 1px solid var(--color-border);
  color: var(--color-text);
  vertical-align: top;
}

.profiling-table td:last-child {
  border-right: none;
}

.profiling-table tr:last-child td {
  border-bottom: none;
}

.profiling-table tr:nth-child(even) td {
  background: #fafbfc;
}

.profiling-table tr:hover td {
  background: #f0fdfa;
}

.bottleneck-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  border: 1px solid;
}

.bottleneck-tag.compute {
  color: #b91c1c;
  border-color: #fecaca;
  background: #fef2f2;
}

.bottleneck-tag.memory {
  color: #1d4ed8;
  border-color: #bfdbfe;
  background: #eff6ff;
}

.bottleneck-tag.latency {
  color: #a16207;
  border-color: #fde047;
  background: #fefce8;
}

.bottleneck-tag.sync {
  color: #c2410c;
  border-color: #fed7aa;
  background: #fff7ed;
}

.bottleneck-tag.comms {
  color: var(--color-accent-hover);
  border-color: #a5f3fc;
  background: #ecfeff;
}

figure {
  margin: 1.5rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}

figure img {
  display: block;
  max-width: 100%;
  height: auto;
  background: #f8fafc;
}

figcaption {
  font-size: 0.75rem;
  color: var(--color-muted);
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--color-border);
  background: #f8fafc;
}

.reference-list {
  font-size: 0.875rem;
  color: var(--color-text);
  line-height: 1.6;
}

.reference-list li {
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.reference-list li:last-child {
  border-bottom: none;
}

.status-wip,
.status-wip-badge {
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-wip);
  border: 1px solid rgba(5, 150, 105, 0.4);
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: var(--color-wip-bg);
}

/* Footer */
.site-footer {
  background: #f1f5f9;
  border-top: 1px solid var(--color-border);
  padding: 2rem 1.25rem;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  font-size: 0.875rem;
  color: var(--color-muted);
  line-height: 1.7;
}

.footer-inner p {
  margin-bottom: 0.65rem;
}

.footer-inner p:last-child {
  margin-bottom: 0;
}

.footer-inner a {
  font-weight: 500;
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-heading);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 80;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background: var(--color-accent-soft);
  border-color: var(--color-accent);
  color: var(--color-accent-hover);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

mjx-container[jax="CHTML"][display="true"] {
  overflow-x: auto;
  padding: 0.5rem 0;
}

@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  .site-tagline {
    display: none;
  }

  .filter-bar-section {
    top: var(--header-height);
  }

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;
  }
}

@media (max-width: 480px) {
  .filter-controls {
    gap: 0.35rem;
  }

  .filter-btn {
    padding: 0.35rem 0.65rem;
    font-size: 0.75rem;
  }
}