:root {
  --bg-void: #0a0d18;
  --bg-panel: #121729;
  --bg-panel-hover: #171d33;
  --border-hair: #262d47;
  --border-hair-bright: #3a4468;
  --accent-blue: #5b8def;
  --accent-blue-dim: #3a5aa8;
  --accent-purple: #9b6bd9;
  --text-primary: #e7eaf5;
  --text-secondary: #99a2c2;
  --text-dim: #5f6788;
  --font-display: "Orbitron", sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

* {
  box-sizing: border-box;
}

html {
  color-scheme: dark;
}

body {
  margin: 0;
  min-height: 100vh;
  position: relative;
  background-color: #05060d;
  background-image:
    radial-gradient(1px 1px at 63.4% 4.4%, rgba(255,255,255,0.43), transparent),
    radial-gradient(2px 2px at 15.4% 11.8%, rgba(255,255,255,0.79), transparent),
    radial-gradient(1px 1px at 10.3% 42.5%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1.5px 1.5px at 24.3% 59.8%, rgba(255,255,255,0.41), transparent),
    radial-gradient(1px 1px at 64.4% 54.3%, rgba(255,255,255,0.55), transparent),
    radial-gradient(1px 1px at 28.7% 85.5%, rgba(255,255,255,0.68), transparent),
    radial-gradient(1px 1px at 34.7% 16.9%, rgba(255,255,255,0.36), transparent),
    radial-gradient(1px 1px at 38.5% 36.5%, rgba(255,255,255,0.63), transparent),
    radial-gradient(1.5px 1.5px at 79.5% 72.1%, rgba(255,255,255,0.37), transparent),
    radial-gradient(1px 1px at 90.5% 9.6%, rgba(255,255,255,0.76), transparent),
    radial-gradient(1.5px 1.5px at 61.4% 84.7%, rgba(255,255,255,0.41), transparent),
    radial-gradient(1px 1px at 8.7% 65.5%, rgba(255,255,255,0.84), transparent),
    radial-gradient(1.5px 1.5px at 84.1% 85.2%, rgba(255,255,255,0.45), transparent),
    radial-gradient(1px 1px at 63.0% 37.0%, rgba(255,255,255,0.5), transparent),
    radial-gradient(2px 2px at 66.3% 69.4%, rgba(255,255,255,0.66), transparent),
    radial-gradient(2px 2px at 60.5% 18.4%, rgba(255,255,255,0.43), transparent),
    radial-gradient(2px 2px at 46.4% 27.9%, rgba(255,255,255,0.68), transparent),
    radial-gradient(1px 1px at 23.1% 33.1%, rgba(255,255,255,0.43), transparent),
    radial-gradient(1px 1px at 5.1% 32.3%, rgba(255,255,255,0.34), transparent),
    radial-gradient(2px 2px at 89.7% 56.4%, rgba(255,255,255,0.47), transparent),
    radial-gradient(2px 2px at 64.9% 40.0%, rgba(255,255,255,0.55), transparent),
    radial-gradient(1.5px 1.5px at 27.4% 25.7%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1.5px 1.5px at 73.7% 43.1%, rgba(255,255,255,0.52), transparent),
    radial-gradient(1.5px 1.5px at 23.1% 97.8%, rgba(255,255,255,0.57), transparent),
    radial-gradient(1px 1px at 74.6% 84.7%, rgba(255,255,255,0.65), transparent),
    radial-gradient(1px 1px at 78.0% 42.5%, rgba(255,255,255,0.51), transparent),
    radial-gradient(1px 1px at 59.2% 46.9%, rgba(255,255,255,0.83), transparent),
    radial-gradient(2px 2px at 84.6% 3.1%, rgba(255,255,255,0.36), transparent),
    radial-gradient(2px 2px at 86.9% 74.1%, rgba(255,255,255,0.49), transparent),
    radial-gradient(1px 1px at 30.2% 17.2%, rgba(255,255,255,0.82), transparent),
    radial-gradient(1.5px 1.5px at 86.1% 27.3%, rgba(255,255,255,0.72), transparent),
    radial-gradient(2px 2px at 50.7% 12.2%, rgba(255,255,255,0.46), transparent),
    radial-gradient(1px 1px at 63.3% 60.5%, rgba(255,255,255,0.51), transparent),
    radial-gradient(1.5px 1.5px at 17.5% 93.5%, rgba(255,255,255,0.81), transparent),
    radial-gradient(1px 1px at 59.5% 48.9%, rgba(255,255,255,0.81), transparent),
    radial-gradient(1px 1px at 86.4% 81.8%, rgba(255,255,255,0.43), transparent),
    radial-gradient(1px 1px at 25.1% 56.5%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1.5px 1.5px at 48.7% 8.6%, rgba(255,255,255,0.72), transparent),
    radial-gradient(1.5px 1.5px at 14.3% 47.6%, rgba(255,255,255,0.39), transparent),
    radial-gradient(1px 1px at 52.7% 60.2%, rgba(255,255,255,0.81), transparent),
    radial-gradient(2px 2px at 74.5% 68.2%, rgba(255,255,255,0.47), transparent),
    radial-gradient(1.5px 1.5px at 97.5% 64.4%, rgba(255,255,255,0.79), transparent),
    radial-gradient(1px 1px at 45.3% 25.8%, rgba(255,255,255,0.49), transparent),
    radial-gradient(1px 1px at 58.5% 24.1%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 70.0% 7.7%, rgba(255,255,255,0.8), transparent),
    radial-gradient(1px 1px at 84.5% 8.8%, rgba(255,255,255,0.45), transparent),
    radial-gradient(2px 2px at 48.6% 53.8%, rgba(255,255,255,0.81), transparent),
    radial-gradient(1.5px 1.5px at 56.8% 47.4%, rgba(255,255,255,0.74), transparent),
    radial-gradient(1.5px 1.5px at 20.3% 11.3%, rgba(255,255,255,0.49), transparent),
    radial-gradient(1px 1px at 41.5% 84.9%, rgba(255,255,255,0.67), transparent),
    radial-gradient(1.5px 1.5px at 96.5% 11.4%, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 78.9% 12.5%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 45.1% 42.5%, rgba(255,255,255,0.55), transparent),
    radial-gradient(1.5px 1.5px at 86.0% 9.2%, rgba(255,255,255,0.35), transparent),
    radial-gradient(1px 1px at 64.6% 53.9%, rgba(255,255,255,0.83), transparent),
    radial-gradient(1px 1px at 90.9% 83.5%, rgba(255,255,255,0.52), transparent),
    radial-gradient(1px 1px at 48.2% 85.0%, rgba(255,255,255,0.39), transparent),
    radial-gradient(1.5px 1.5px at 2.2% 39.5%, rgba(255,255,255,0.46), transparent),
    radial-gradient(1.5px 1.5px at 68.9% 72.1%, rgba(255,255,255,0.66), transparent),
    radial-gradient(1px 1px at 48.7% 20.2%, rgba(255,255,255,0.83), transparent);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
}

.nebula {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1100px;
  pointer-events: none;
  z-index: 0;
  background:
    radial-gradient(ellipse 60% 65% at 22% 15%, rgba(120,90,220,0.30), transparent 72%),
    radial-gradient(ellipse 65% 70% at 78% 22%, rgba(139,95,191,0.40), transparent 72%),
    radial-gradient(ellipse 60% 65% at 50% 45%, rgba(90,60,170,0.26), transparent 72%),
    radial-gradient(ellipse 45% 50% at 90% 55%, rgba(91,141,239,0.14), transparent 72%);
}

.wrap {
  position: relative;
  z-index: 1;
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 20px 120px;
}

/* Header */
header.site-header {
  position: relative;
  text-align: center;
  margin-bottom: 40px;
  padding-bottom: 32px;
}

header.site-header::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
}

.site-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 28px;
  letter-spacing: 0.06em;
  margin: 0;
  background: linear-gradient(120deg, #8fb4f5, var(--accent-purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 16px rgba(139, 95, 191, 0.3));
}

.site-sub {
  margin: 10px 0 0;
  color: var(--text-dim);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.site-footer {
  text-align: center;
  margin-top: 60px;
  padding-top: 20px;
  border-top: 1px solid var(--border-hair);
}

.site-footer p {
  margin: 0;
  font-size: 12px;
  color: var(--text-dim);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

/* Tag filter */
.tag-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.tag-chip {
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--text-secondary);
  background: var(--bg-panel);
  border: 1px solid var(--border-hair);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.tag-chip:hover {
  border-color: var(--border-hair-bright);
  color: var(--text-primary);
}

.tag-chip.active {
  color: #eaf1ff;
  border-color: var(--accent-blue);
  background: linear-gradient(120deg, rgba(91,141,239,0.18), rgba(155,107,217,0.18));
}

/* Post list */
.post-list {
  display: flex;
  flex-direction: column;
}

.post-card {
  border-top: 1px solid var(--border-hair);
  padding: 22px 4px;
  transition: background 0.15s;
}

.post-card:last-child {
  border-bottom: 1px solid var(--border-hair);
}

.post-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.toggle-btn {
  flex: none;
  width: 26px;
  height: 26px;
  margin-top: 2px;
  border: 1px solid var(--border-hair-bright);
  background: transparent;
  color: var(--accent-blue);
  border-radius: 3px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, border-color 0.15s, box-shadow 0.15s;
}

.toggle-btn:hover {
  border-color: var(--accent-blue);
  box-shadow: 0 0 10px rgba(91, 141, 239, 0.35);
}

.toggle-btn svg {
  width: 12px;
  height: 12px;
  transition: transform 0.2s ease;
}

.post-card.expanded .toggle-btn svg {
  transform: rotate(180deg);
}

.post-card.expanded .toggle-btn {
  border-color: var(--accent-purple);
  color: var(--accent-purple);
}

.post-headline {
  flex: 1;
  min-width: 0;
}

.post-title {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  color: var(--text-dim);
  margin-bottom: 8px;
}

.post-date {
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}

.post-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.post-tags span {
  color: var(--accent-purple);
}

.post-excerpt {
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.post-embed {
  margin-top: 16px;
  padding-left: 40px;
}

.post-embed.hidden {
  display: none;
}

.post-embed .twitter-tweet {
  margin: 0 !important;
}

.embed-loading {
  color: var(--text-dim);
  font-size: 13px;
  font-family: var(--font-mono);
  padding: 12px 0;
}

.empty-state {
  text-align: center;
  color: var(--text-dim);
  padding: 60px 0;
  font-size: 14px;
}

/* Forms (register page) */
.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border-hair);
  border-radius: 6px;
  padding: 28px;
}

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.field input,
.field textarea {
  width: 100%;
  background: var(--bg-void);
  border: 1px solid var(--border-hair);
  border-radius: 4px;
  color: var(--text-primary);
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 14px;
}

.field input:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(91, 141, 239, 0.15);
}

.field textarea {
  min-height: 70px;
  resize: vertical;
}

.field .hint {
  font-size: 12px;
  color: var(--text-dim);
  margin-top: 5px;
}

.btn-primary {
  width: 100%;
  padding: 12px;
  border: none;
  border-radius: 4px;
  background: linear-gradient(120deg, var(--accent-blue), var(--accent-purple));
  color: #060810;
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: filter 0.15s;
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-message {
  margin-top: 14px;
  font-size: 13px;
  padding: 10px 12px;
  border-radius: 4px;
  display: none;
}

.form-message.show {
  display: block;
}

.form-message.success {
  background: rgba(91, 141, 239, 0.12);
  color: var(--accent-blue);
  border: 1px solid var(--accent-blue-dim);
}

.form-message.error {
  background: rgba(217, 91, 91, 0.12);
  color: #e08787;
  border: 1px solid #7a3a3a;
}

.back-link {
  display: inline-block;
  margin-bottom: 24px;
  color: var(--text-dim);
  text-decoration: none;
  font-size: 13px;
}

.back-link:hover {
  color: var(--accent-blue);
}

@media (max-width: 480px) {
  .post-embed {
    padding-left: 0;
  }
}