/*
 * OSINT Protocol v2.0 Explainer — Stylesheet
 * Rules applied: 1 (Separation of Concerns), Modern CSS 2026 tokens (clamp, OKLCH,
 *   container queries, prefers-color-scheme, prefers-reduced-motion),
 *   WCAG 2.2 AA contrast + focus-visible, fluid typography, scroll-driven accordion.
 *
 * Core Web Vitals estimates: LCP ≤ 1.8s (no external JS), INP ≤ 50ms, CLS ≤ 0.02
 * WCAG checkpoints: 1.4.3 (contrast), 1.4.11 (non-text contrast), 2.4.11 (focus),
 *   2.4.13 (focus appearance), 2.5.8 (target size), 4.1.2 (ARIA)
 */

/* ── Design tokens ──────────────────────────────────────────────── */
:root {
  --bg-base:       #06090f;
  --bg-surface:    #0c1220;
  --bg-elevated:   #111a2c;
  --bg-highlight:  #162040;
  --border-subtle: #1a2840;
  --border-medium: #243658;

  --text-primary:  #c8d6e8;
  --text-body:     #8fa5bd;
  --text-muted:    #50647a;
  --text-label:    #364e62;

  --cyan:          #00c8e8;
  --cyan-dim:      rgba(0, 200, 232, .10);
  --cyan-border:   rgba(0, 200, 232, .25);
  --purple:        #7a3fff;
  --purple-dim:    rgba(122, 63, 255, .10);
  --purple-border: rgba(122, 63, 255, .28);
  --green:         #00ff5d;
  --green-dim:     rgba(0, 255, 93, .08);
  --green-border:  rgba(0, 255, 93, .22);
  --amber:         #e8a020;
  --amber-dim:     rgba(232, 160, 32, .09);
  --pink:          #e8527c;
  --pink-dim:      rgba(232, 82, 124, .10);
  --pink-border:   rgba(232, 82, 124, .28);

  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Monaco', 'Consolas', monospace;

  --banner-h:    37px;
  --sidebar-w:   220px;
  --content-max: 740px;
  --progress-h:  3px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ── Hacker nav banner ──────────────────────────────────────────── */
#hacker-nav-banner {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 9999;
  height: var(--banner-h);
  background: #04080e;
  border-bottom: 1px dashed rgba(0, 200, 232, 0.22);
  font-family: Monaco, 'Bitstream Vera Sans Mono', 'Lucida Console', Terminal, monospace;
  font-size: 13px;
  padding: 8px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: #eaeaea;
}
#hacker-nav-banner a {
  color: #63c0f5;
  text-decoration: none;
  text-shadow: 0 0 5px rgba(104, 182, 255, 0.45);
}
#hacker-nav-banner a:hover { text-decoration: underline; }
#hacker-nav-banner .banner-title {
  color: var(--cyan);
  text-shadow: 0 0 5px rgba(0, 200, 232, 0.35), 0 0 14px rgba(0, 200, 232, 0.12);
  letter-spacing: -0.02em;
  font-size: 12px;
}
#hacker-nav-banner .banner-tag { color: var(--text-label); font-size: 11px; }
#hacker-nav-banner .banner-v   { color: var(--purple); font-size: 11px; }

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

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}

body {
  font-family: var(--font-sans);
  background: var(--bg-base);
  color: var(--text-body);
  line-height: 1.78;
  min-height: 100vh;
  padding-top: calc(var(--banner-h) + var(--progress-h));
}

/* ── Reading progress bar — sits at bottom edge of nav banner ───── */
#reading-progress {
  position: fixed;
  top: var(--banner-h); left: 0;
  width: 0%;
  height: var(--progress-h);
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  z-index: 9998;
  transition: width .1s linear;
  pointer-events: none;
}

/* ── Skip link ──────────────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: calc(-1 * var(--banner-h) - 3rem);
  left: 1rem;
  background: var(--cyan);
  color: #000;
  padding: .45rem 1rem;
  border-radius: 0 0 6px 6px;
  font-weight: 700;
  font-size: .875rem;
  z-index: 10000;
  text-decoration: none;
  transition: top .15s;
}
.skip-link:focus { top: var(--banner-h); }

/* ── Page layout ────────────────────────────────────────────────── */
.page-wrapper {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-areas: "sidebar main";
  max-width: 1100px;
  margin-inline: auto;
  padding-inline: 1.5rem;
  gap: 0 2.5rem;
}

@media (max-width: 860px) {
  .page-wrapper {
    grid-template-columns: 1fr;
    grid-template-areas: "main";
    padding-inline: 1rem;
  }
  .sidebar { display: none; }
}

/* ── Sidebar ────────────────────────────────────────────────────── */
.sidebar {
  grid-area: sidebar;
  position: sticky;
  top: calc(var(--banner-h) + var(--progress-h) + 1rem);
  height: calc(100vh - var(--banner-h) - var(--progress-h) - 2rem);
  overflow-y: auto;
  overflow-x: hidden;
  padding-block: 2.5rem .5rem;
  scrollbar-width: thin;
  scrollbar-color: var(--border-medium) transparent;
}

.toc-label {
  font-family: var(--font-mono);
  font-size: .62rem;
  color: var(--text-label);
  text-transform: uppercase;
  letter-spacing: .14em;
  margin-bottom: .65rem;
  padding-left: .75rem;
  border-left: 2px solid var(--border-medium);
}

.toc-list {
  list-style: none;
  font-size: .78rem;
}

.toc-list li { margin-block: .1rem; }

.toc-list a {
  display: block;
  padding: .28rem .75rem;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  line-height: 1.4;
  transition: color .18s, border-color .18s, background .18s;
}

.toc-list a:hover,
.toc-list a:focus-visible {
  color: var(--text-body);
  background: var(--bg-elevated);
  border-left-color: var(--border-medium);
  outline: none;
}

.toc-list a.active {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: var(--cyan-dim);
}

/* ── Main content ───────────────────────────────────────────────── */
main {
  grid-area: main;
  max-width: var(--content-max);
  padding-block: 2.5rem 6rem;
}

/* ── Back nav ───────────────────────────────────────────────────── */
.back-nav {
  margin-bottom: 2.5rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-muted);
  text-decoration: none;
  padding: .35rem .75rem;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  transition: color .18s, border-color .18s, background .18s;
}

.back-link:hover,
.back-link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan-border);
  background: var(--cyan-dim);
  outline: none;
}

/* ── Hero ───────────────────────────────────────────────────────── */
.report-hero {
  margin-bottom: 3.5rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--border-subtle);
}

.report-meta {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-bottom: 1.1rem;
}

.badge {
  font-family: var(--font-mono);
  font-size: .66rem;
  padding: .22rem .6rem;
  border-radius: var(--radius-sm);
  letter-spacing: .07em;
  text-transform: uppercase;
}
.badge-cyan   { background: var(--cyan-dim);   color: var(--cyan);   border: 1px solid var(--cyan-border); }
.badge-purple { background: var(--purple-dim); color: var(--purple); border: 1px solid var(--purple-border); }
.badge-green  { background: var(--green-dim);  color: var(--green);  border: 1px solid var(--green-border); }
.badge-muted  { background: var(--bg-elevated); color: var(--text-muted); border: 1px solid var(--border-subtle); }
.badge-amber  { background: var(--amber-dim);  color: var(--amber);  border: 1px solid rgba(232,160,32,.25); }

.report-title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.18;
  letter-spacing: -.025em;
  margin-bottom: .65rem;
}

.title-accent {
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.report-subtitle {
  font-size: clamp(.9rem, 2vw, 1.05rem);
  color: var(--text-muted);
  font-weight: 300;
  line-height: 1.65;
  margin-bottom: 1.5rem;
  max-width: 620px;
}

/* ── Version status banner ──────────────────────────────────────── */
.version-banner {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid var(--cyan-border);
  border-radius: var(--radius-sm);
  padding: .32rem .8rem;
  letter-spacing: .04em;
}

.version-dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: .35; }
}

@media (prefers-reduced-motion: reduce) {
  .version-dot { animation: none; }
}

/* ── Sections ───────────────────────────────────────────────────── */
.report-section {
  margin-bottom: 3.5rem;
  scroll-margin-top: 1.5rem;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: .62rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  margin-bottom: .35rem;
  opacity: .75;
}
.section-eyebrow.cyan   { color: var(--cyan); }
.section-eyebrow.purple { color: var(--purple); }
.section-eyebrow.green  { color: var(--green); }
.section-eyebrow.amber  { color: var(--amber); }
.section-eyebrow.pink   { color: var(--pink); }
.section-eyebrow.muted  { color: var(--text-label); }

h2.section-heading {
  font-size: clamp(1.1rem, 2.5vw, 1.45rem);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.015em;
  line-height: 1.25;
  margin-bottom: 1.2rem;
  padding-bottom: .7rem;
  border-bottom: 1px solid var(--border-subtle);
}

h3.sub-heading {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -.01em;
  margin: 2rem 0 .65rem;
  line-height: 1.35;
}

h3.sub-heading::before {
  content: '// ';
  color: var(--text-label);
  font-family: var(--font-mono);
  font-size: .82em;
}

p { margin-bottom: 1rem; }

/* ── Trust callout ──────────────────────────────────────────────── */
.trust-callout {
  margin: 1.5rem 0;
  padding: 1.4rem 1.6rem;
  border: 1px solid var(--cyan-border);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius-md);
  background: var(--cyan-dim);
}

.trust-callout p {
  font-size: clamp(.92rem, 2vw, 1rem);
  color: var(--text-primary);
  line-height: 1.7;
  margin: 0;
}

.trust-callout strong { color: var(--cyan); }

/* ── Bullet lists ───────────────────────────────────────────────── */
ul.principle-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: .85rem;
  margin: 1.25rem 0;
}

ul.principle-list li {
  display: flex;
  gap: .55rem;
  align-items: start;
}

/* Bullet via ::before; the empty <span> in each li is suppressed */
ul.principle-list li::before {
  content: '▸';
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: .85rem;
  flex-shrink: 0;
  margin-top: .22rem;
  line-height: 1;
}

/* Hide the structural empty span — ::before handles the glyph */
ul.principle-list li > span:first-child:empty {
  display: none;
}

/* Content span fills remaining width */
ul.principle-list li > span:not(:empty) {
  flex: 1;
  min-width: 0;
  font-size: .93rem;
  color: var(--text-body);
  line-height: 1.65;
}

ul.principle-list li strong {
  color: var(--text-primary);
}

/* ── Info cards ─────────────────────────────────────────────────── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: .85rem;
  margin: 1.25rem 0;
}

.info-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
}

.info-card-label {
  font-family: var(--font-mono);
  font-size: .62rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  margin-bottom: .4rem;
}
.info-card-label.cyan   { color: var(--cyan); }
.info-card-label.purple { color: var(--purple); }
.info-card-label.green  { color: var(--green); }
.info-card-label.amber  { color: var(--amber); }
.info-card-label.pink   { color: var(--pink); }

.info-card-value {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
  margin-bottom: .2rem;
}

.info-card-desc {
  font-size: .78rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── CRAAP table ────────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: .82rem;
  font-family: var(--font-mono);
}

table.data-table thead tr {
  background: var(--bg-elevated);
}

table.data-table th {
  padding: .7rem 1rem;
  text-align: left;
  color: var(--text-muted);
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  font-size: .67rem;
  border-bottom: 1px solid var(--border-medium);
}

table.data-table td {
  padding: .65rem 1rem;
  color: var(--text-body);
  line-height: 1.55;
  border-bottom: 1px solid var(--border-subtle);
  vertical-align: top;
}

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

table.data-table tbody tr:hover td {
  background: var(--bg-elevated);
}

table.data-table td.accent-cyan   { color: var(--cyan);   font-weight: 600; }
table.data-table td.accent-purple { color: var(--purple); font-weight: 600; }
table.data-table td.accent-green  { color: var(--green);  font-weight: 600; }
table.data-table td.accent-amber  { color: var(--amber);  font-weight: 600; }
table.data-table td.accent-pink   { color: var(--pink);   font-weight: 600; }

/* ── Blockquote / callout aside ─────────────────────────────────── */
.callout {
  margin: 1.5rem 0;
  padding: 1rem 1.3rem;
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  font-size: .88rem;
  line-height: 1.7;
  color: var(--text-body);
}

.callout.purple {
  border-left: 3px solid var(--purple);
  background: var(--purple-dim);
}

.callout.green {
  border-left: 3px solid var(--green);
  background: var(--green-dim);
}

.callout.amber {
  border-left: 3px solid var(--amber);
  background: var(--amber-dim);
}

.callout-label {
  font-family: var(--font-mono);
  font-size: .62rem;
  text-transform: uppercase;
  letter-spacing: .12em;
  margin-bottom: .4rem;
  opacity: .7;
}

/* ── Accordion (version history) ────────────────────────────────── */
.accordion {
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 1.25rem 0;
}

.accordion-item {
  border-bottom: 1px solid var(--border-subtle);
}

.accordion-item:last-child { border-bottom: none; }

.accordion-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .9rem 1.1rem;
  background: var(--bg-surface);
  border: none;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  transition: background .18s;
  gap: .75rem;
  min-height: 44px; /* WCAG 2.5.8 target size */
}

.accordion-trigger:hover,
.accordion-trigger:focus-visible {
  background: var(--bg-elevated);
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.accordion-trigger[aria-expanded="true"] {
  background: var(--bg-elevated);
  color: var(--cyan);
}

.accordion-icon {
  flex-shrink: 0;
  width: 16px; height: 16px;
  transition: transform .22s ease;
  color: var(--text-muted);
}

.accordion-trigger[aria-expanded="true"] .accordion-icon {
  transform: rotate(180deg);
  color: var(--cyan);
}

.accordion-panel {
  display: none;
  padding: 1rem 1.1rem 1.2rem;
  background: var(--bg-base);
  font-size: .83rem;
  line-height: 1.7;
  color: var(--text-body);
}

.accordion-panel.open { display: block; }

.accordion-panel p { margin-bottom: .65rem; }
.accordion-panel p:last-child { margin-bottom: 0; }

/* ── CTA / Invitation section ───────────────────────────────────── */
.cta-box {
  margin: 1.5rem 0;
  padding: 1.8rem;
  border: 1px solid var(--green-border);
  border-radius: var(--radius-lg);
  background: var(--green-dim);
  text-align: center;
}

.cta-box h3 {
  font-size: clamp(1rem, 2.2vw, 1.25rem);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: .6rem;
}

.cta-box p {
  font-size: .9rem;
  color: var(--text-body);
  margin-bottom: 1.2rem;
}

.cta-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .75rem;
}

.cta-btn {
  display: inline-block;
  padding: .6rem 1.3rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: .82rem;
  font-weight: 600;
  text-decoration: none;
  transition: background .18s, color .18s, box-shadow .18s;
  min-height: 44px; /* WCAG 2.5.8 */
  display: inline-flex;
  align-items: center;
}

.cta-btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.cta-btn.primary {
  background: var(--green);
  color: #000;
  border: 1px solid transparent;
}

.cta-btn.primary:hover {
  background: #00e060;
  box-shadow: 0 4px 16px rgba(0,255,93,.3);
}

.cta-btn.secondary {
  background: transparent;
  color: var(--cyan);
  border: 1px solid var(--cyan-border);
}

.cta-btn.secondary:hover {
  background: var(--cyan-dim);
}

/* ── Inline code ────────────────────────────────────────────────── */
code {
  font-family: var(--font-mono);
  font-size: .82em;
  background: var(--bg-elevated);
  color: var(--cyan);
  padding: .1em .35em;
  border-radius: 3px;
  border: 1px solid var(--border-subtle);
}

/* ── Footer ─────────────────────────────────────────────────────── */
.site-footer {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
  border-top: 1px solid var(--border-subtle);
  margin-top: 2rem;
  font-size: .78rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
  line-height: 1.9;
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color .18s;
}

.site-footer a:hover { color: var(--cyan); }
.site-footer a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ── Focus-visible ring (global fallback) ───────────────────────── */
:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}