/* ============================================================
   SYD / SIGNAL — DESIGN SYSTEM
   syd-protocol.github.io/signal
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Share+Tech+Mono&family=DM+Sans:wght@300;400;500&display=swap');

/* ─── TOKENS ─────────────────────────────────────────────── */

:root {
  --navy:         #0f0f1a;
  --navy-mid:     #13131f;
  --navy-surface: #1a1a2e;
  --navy-border:  #1e1e35;

  --cyan:         #4fc3f7;
  --cyan-dim:     #2a7fa8;
  --cyan-faint:   rgba(79, 195, 247, 0.08);
  --cyan-border:  rgba(79, 195, 247, 0.25);
  --cyan-glow:    rgba(79, 195, 247, 0.12);

  --text-primary: #e8eaf0;
  --text-secondary: #9ca3b8;
  --text-muted:   #4a5568;

  --font-mono: 'Share Tech Mono', 'Courier New', monospace;
  --font-body: 'DM Sans', system-ui, sans-serif;

  --scanline-opacity: 0.03;
  --border-radius: 2px;
  --transition: 150ms ease;
}

/* ─── RESET ──────────────────────────────────────────────── */

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  background-color: var(--navy);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.7;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* ─── SCANLINE TEXTURE ───────────────────────────────────── */

body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, var(--scanline-opacity)) 2px,
    rgba(0, 0, 0, var(--scanline-opacity)) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ─── NOISE OVERLAY ──────────────────────────────────────── */

body::after {
  content: '';
  position: fixed;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  pointer-events: none;
  opacity: 0.4;
  z-index: 9998;
}

/* ─── TYPOGRAPHY ─────────────────────────────────────────── */

h1, h2, h3 {
  font-family: var(--font-mono);
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

p {
  font-family: var(--font-body);
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.8;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  opacity: 0.75;
}

hr {
  border: none;
  border-top: 1px solid var(--navy-border);
  margin: 2rem 0;
}

/* ─── LAYOUT SHELL ───────────────────────────────────────── */

.shell {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ─── TERMINAL CHROME ────────────────────────────────────── */

.terminal-header {
  padding: 3rem 0 2rem;
  border-bottom: 1px solid var(--navy-border);
}

.terminal-header .brand {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.boot-sequence {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--cyan);
  line-height: 2;
}

.boot-line {
  display: block;
  opacity: 0;
  animation: bootReveal 0.3s ease forwards;
}

.boot-line:nth-child(1) { animation-delay: 0.3s; }
.boot-line:nth-child(2) { animation-delay: 0.7s; }
.boot-line:nth-child(3) { animation-delay: 1.1s; }
.boot-line:nth-child(4) { animation-delay: 1.5s; }

@keyframes bootReveal {
  from { opacity: 0; transform: translateX(-4px); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ─── CURSOR BLINK ───────────────────────────────────────── */

.cursor {
  display: inline-block;
  width: 0.55em;
  height: 1em;
  background: var(--cyan);
  vertical-align: text-bottom;
  margin-left: 2px;
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

/* ─── TRANSMISSION LOG (INDEX) ───────────────────────────── */

.log-section {
  padding: 2.5rem 0;
}

.log-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.25em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}

.transmission-list {
  list-style: none;
}

.transmission-entry {
  border: 1px solid var(--navy-border);
  border-radius: var(--border-radius);
  margin-bottom: 0.5rem;
  transition: border-color var(--transition), background var(--transition);
  opacity: 0;
  animation: entryReveal 0.4s ease forwards;
}

.transmission-entry:nth-child(1) { animation-delay: 1.9s; }
.transmission-entry:nth-child(2) { animation-delay: 2.1s; }
.transmission-entry:nth-child(3) { animation-delay: 2.3s; }
.transmission-entry:nth-child(4) { animation-delay: 2.5s; }
.transmission-entry:nth-child(5) { animation-delay: 2.7s; }

@keyframes entryReveal {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.transmission-entry:hover {
  border-color: var(--cyan-dim);
  background: var(--cyan-faint);
}

.transmission-entry a {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1rem 1.25rem;
  color: inherit;
  text-decoration: none;
}

.entry-id {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan-dim);
  letter-spacing: 0.1em;
  flex-shrink: 0;
  min-width: 3.5rem;
}

.entry-title {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-primary);
  flex: 1;
}

.entry-date {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
  flex-shrink: 0;
}

/* Locked/upcoming entries */
.transmission-entry.locked {
  opacity: 0.35;
  pointer-events: none;
  animation-delay: 0s;
  animation: none;
}

.transmission-entry.locked .entry-id::after {
  content: ' [ENCRYPTED]';
  color: var(--text-muted);
  font-size: 0.6rem;
}

/* ─── TERMINAL FOOTER ────────────────────────────────────── */

.terminal-footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--navy-border);
}

.footer-text {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  line-height: 2;
}

.footer-text a {
  color: var(--text-muted);
  border-bottom: 1px solid var(--navy-border);
  padding-bottom: 1px;
}

.footer-text a:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
}

/* ─── CHAPTER READER ─────────────────────────────────────── */

.reader-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--navy-border);
}

.reader-nav-top {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-bottom: 2rem;
}

.reader-nav-top a {
  color: var(--text-muted);
  transition: color var(--transition);
}

.reader-nav-top a:hover {
  color: var(--cyan);
}

.reader-meta {
  display: flex;
  gap: 1.5rem;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.reader-id {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--cyan-dim);
  letter-spacing: 0.1em;
}

.reader-date {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.08em;
}

.reader-title {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--cyan);
  letter-spacing: 0.04em;
  font-weight: 400;
}

/* ─── CHAPTER CONTENT ────────────────────────────────────── */

.chapter-body {
  padding: 3rem 0;
}

/* Progressive render animation */
.chapter-body.rendering p,
.chapter-body.rendering .system-block {
  opacity: 0;
  animation: contentReveal 0.5s ease forwards;
}

@keyframes contentReveal {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* Narrative prose */
.chapter-body p {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.85;
  margin-bottom: 1.5rem;
  max-width: 65ch;
}

/* Scene breaks */
.chapter-body hr {
  border: none;
  text-align: center;
  margin: 2.5rem 0;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.3em;
}

.chapter-body hr::after {
  content: '* * *';
}

/* System voice block */
.system-block {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--cyan);
  line-height: 1.9;
  letter-spacing: 0.02em;

  background: var(--cyan-faint);
  border: 1px solid var(--cyan-border);
  border-radius: var(--border-radius);
  padding: 1.5rem 1.75rem;
  margin: 2rem 0;

  position: relative;
}

.system-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan-border), transparent);
}

/* Bracket headers inside system blocks */
.system-block p {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--cyan);
  line-height: 1.9;
  margin-bottom: 0.5rem;
  max-width: none;
}

.system-block p:last-child {
  margin-bottom: 0;
}

/* CTA note at chapter end */
.chapter-cta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  border-top: 1px solid var(--navy-border);
  padding-top: 2rem;
  margin-top: 3rem;
}

.chapter-cta a {
  color: var(--cyan-dim);
  border-bottom: 1px solid var(--navy-border);
  padding-bottom: 1px;
}

.chapter-cta a:hover {
  color: var(--cyan);
  border-color: var(--cyan);
}

/* ─── READER NAVIGATION (BOTTOM) ─────────────────────────── */

.reader-nav-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--navy-border);
  gap: 1rem;
}

.nav-btn {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-muted);
  border: 1px solid var(--navy-border);
  border-radius: var(--border-radius);
  padding: 0.6rem 1rem;
  transition: all var(--transition);
  cursor: pointer;
  background: none;
}

.nav-btn:hover {
  color: var(--cyan);
  border-color: var(--cyan-dim);
  background: var(--cyan-faint);
}

.nav-btn:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

.nav-btn:disabled:hover {
  color: var(--text-muted);
  border-color: var(--navy-border);
  background: none;
}

/* ─── LOADING STATE ──────────────────────────────────────── */

.loading-indicator {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--cyan);
  padding: 4rem 0;
  text-align: center;
  letter-spacing: 0.15em;
}

.loading-indicator .cursor {
  display: inline-block;
}

/* ─── RESPONSIVE ─────────────────────────────────────────── */

@media (max-width: 600px) {
  .terminal-header { padding: 2rem 0 1.5rem; }
  .reader-title { font-size: 1.1rem; }
  .system-block { padding: 1.25rem 1.25rem; font-size: 0.78rem; }
  .chapter-body p { font-size: 0.95rem; }
  .transmission-entry a { flex-wrap: wrap; gap: 0.4rem; }
  .entry-date { display: none; }
  .reader-nav-bottom { flex-direction: column; align-items: stretch; }
  .nav-btn { text-align: center; }
}

/* ─── UTILITIES ──────────────────────────────────────────── */

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.hidden { display: none !important; }
/* ─── CAROUSEL MODE OVERRIDES (mobile) ──────────────────────────────────── */
/* These supplement the dynamically injected carousel CSS in reader.js      */

@media (max-width: 600px) {
  body.carousel-mode {
    overflow: hidden !important;
  }
  body.carousel-mode .chapter-body {
    display: none !important;
  }
  body.carousel-mode #reader-nav-bottom {
    display: none !important;
  }
}

/* ─── CAROUSEL MODE OVERRIDES ────────────────────────────────────────────────
   Applied when body.carousel-mode is set by reader.js on mobile.
   Not scoped to a media query — the JS decides when carousel mode activates.  */

body.carousel-mode {
  overflow: hidden !important;
}
body.carousel-mode .chapter-body {
  display: none !important;
}
body.carousel-mode #reader-nav-bottom {
  display: none !important;
}


/* ─── CHAPTER FILTER ─────────────────────────────────────────────────────── */

.filter-wrap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  position: relative;
}

.filter-input {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  background: var(--navy-surface);
  border: 1px solid var(--navy-border);
  border-radius: var(--border-radius);
  padding: 0.65rem 1rem;
  outline: none;
  transition: border-color var(--transition), background var(--transition);
  caret-color: var(--cyan);
}

.filter-input::placeholder {
  color: var(--text-muted);
  opacity: 1;
}

.filter-input:focus {
  border-color: var(--cyan-dim);
  background: var(--navy-mid);
}

.filter-count {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 4rem;
  text-align: right;
}

/* Hide entries that don't match the filter */
.transmission-entry.filtered-out {
  display: none;
}