/* ===== DNU — blue circuit-board theme ===== */

:root {
  --bg-deep: #03102a;
  --bg-mid: #06234a;
  --trace: #1f6feb;
  --trace-bright: #4fc3ff;
  --pad: #7fd9ff;
  --text: #e6f1ff;
  --text-dim: #8aa7c9;
  --read: #4a5e7a;
  --danger: #ff6b8a;
  --accent: #00e1ff;
  --card: rgba(8, 26, 56, 0.78);
  --card-border: rgba(79, 195, 255, 0.25);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  min-height: 100vh;
  font-family: ui-monospace, "JetBrains Mono", "Cascadia Code", Consolas, monospace;
  color: var(--text);
  background: var(--bg-deep);
}

/* ---------- circuit-board background ---------- */

.circuit-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-color: var(--bg-deep);
  background-image:
    /* glowing junction pads */
    radial-gradient(circle at 20px 20px, var(--pad) 1.6px, transparent 2.2px),
    radial-gradient(circle at 100px 60px, var(--pad) 1.6px, transparent 2.2px),
    radial-gradient(circle at 60px 140px, var(--pad) 1.6px, transparent 2.2px),
    radial-gradient(circle at 140px 100px, var(--pad) 1.6px, transparent 2.2px),
    /* horizontal traces */
    linear-gradient(90deg, transparent 0, transparent 18px, var(--trace) 18px, var(--trace) 22px, transparent 22px),
    linear-gradient(90deg, transparent 0, transparent 98px, var(--trace-bright) 98px, var(--trace-bright) 102px, transparent 102px),
    /* vertical traces */
    linear-gradient(0deg, transparent 0, transparent 58px, var(--trace) 58px, var(--trace) 62px, transparent 62px),
    linear-gradient(0deg, transparent 0, transparent 138px, var(--trace-bright) 138px, var(--trace-bright) 142px, transparent 142px),
    /* deep blue base wash */
    radial-gradient(ellipse at top, var(--bg-mid) 0%, var(--bg-deep) 60%);
  background-size:
    160px 160px,
    160px 160px,
    160px 160px,
    160px 160px,
    160px 160px,
    160px 160px,
    160px 160px,
    160px 160px,
    100% 100%;
  opacity: 0.85;
}

.circuit-bg::after {
  /* soft scan-line / vignette overlay */
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      0deg,
      rgba(0, 30, 60, 0.0) 0px,
      rgba(0, 30, 60, 0.0) 3px,
      rgba(0, 0, 0, 0.18) 3px,
      rgba(0, 0, 0, 0.18) 4px
    ),
    radial-gradient(ellipse at center, transparent 40%, rgba(0, 0, 0, 0.6) 100%);
  pointer-events: none;
}

/* ---------- top bar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 1.5rem;
  background: linear-gradient(180deg, rgba(3, 16, 42, 0.95) 0%, rgba(3, 16, 42, 0.7) 100%);
  border-bottom: 1px solid var(--card-border);
  backdrop-filter: blur(8px);
}

.brand { display: flex; align-items: center; gap: 0.8rem; }

.logo-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent), 0 0 28px var(--accent);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50%      { transform: scale(1.3); opacity: 0.7; }
}

.brand-text h1 {
  margin: 0;
  font-size: 1.55rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  text-shadow: 0 0 12px rgba(0, 225, 255, 0.55);
}

.brand-text .tagline {
  margin: 0.1rem 0 0 0;
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.topbar-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }

/* ---------- buttons ---------- */

.btn {
  font: inherit;
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  padding: 0.55rem 0.9rem;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid var(--card-border);
  background: rgba(8, 26, 56, 0.6);
  color: var(--text);
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn:hover {
  border-color: var(--trace-bright);
  box-shadow: 0 0 12px rgba(79, 195, 255, 0.4);
  transform: translateY(-1px);
}

.btn:active { transform: translateY(0); }

.btn-primary {
  background: linear-gradient(180deg, #1763d6 0%, #0b3d8e 100%);
  border-color: var(--trace-bright);
  font-weight: 600;
}

.btn-primary:hover { box-shadow: 0 0 18px rgba(79, 195, 255, 0.6); }

.btn-icon { display: inline-block; margin-right: 0.25rem; }

.btn-ghost { background: transparent; }

.btn-read {
  font-size: 0.72rem;
  padding: 0.35rem 0.65rem;
  flex-shrink: 0;
  align-self: flex-start;
}

/* ---------- feed grid ---------- */

#feed-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(360px, 1fr));
  gap: 1.2rem;
  padding: 1.5rem;
}

.loading {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem;
  color: var(--text-dim);
  font-size: 1rem;
  letter-spacing: 0.06em;
}

.source {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  padding: 1rem 1.1rem 0.5rem;
  box-shadow: 0 0 24px rgba(0, 50, 120, 0.35), inset 0 0 0 1px rgba(255, 255, 255, 0.03);
  backdrop-filter: blur(4px);
  display: flex;
  flex-direction: column;
}

.source-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  border-bottom: 1px dashed var(--card-border);
  padding-bottom: 0.6rem;
  margin-bottom: 0.4rem;
}

.source-name {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  color: var(--trace-bright);
}

.source-link {
  color: var(--text-dim);
  text-decoration: none;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}
.source-link:hover { color: var(--accent); }

.article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.article {
  display: flex;
  gap: 0.8rem;
  align-items: flex-start;
  padding: 0.7rem 0;
  border-bottom: 1px solid rgba(79, 195, 255, 0.1);
}
.article:last-child { border-bottom: none; }

.article-main { flex: 1; min-width: 0; }

.article-title {
  display: block;
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
  line-height: 1.35;
  font-weight: 500;
}
.article-title:hover { color: var(--accent); }

.article-meta {
  margin-top: 0.25rem;
  color: var(--text-dim);
  font-size: 0.72rem;
}

/* read state */
.article.read .article-title {
  color: var(--read);
  text-decoration: line-through;
  font-weight: 400;
}
.article.read .article-time { opacity: 0.6; }
.article.read .btn-read {
  opacity: 0.4;
  pointer-events: none;
}

/* empty / error states */
.source-empty {
  padding: 0.8rem 0;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-style: italic;
}
.source-error {
  color: var(--danger);
  font-size: 0.75rem;
  padding: 0.4rem 0;
  font-style: italic;
}

/* ---------- footer ---------- */

.footer {
  text-align: center;
  padding: 1rem;
  color: var(--text-dim);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}
.footer-sep { margin: 0 0.6rem; }

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }
  .topbar-actions { width: 100%; }
  .topbar-actions .btn { flex: 1; }
  #feed-container { padding: 1rem; gap: 1rem; }
}