/* ============================================================
   Sections — hero, about, projects, blog, dashboard, course
   ============================================================ */

/* ─── Hero ─────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: 88px 0 72px;
  border-top: none;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 6px 12px 6px 8px;
  border: 1px solid var(--hairline);
  border-radius: 999px;
  background: var(--surface);
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-dim);
  margin-bottom: 28px;
}
.hero-eyebrow .badge {
  background: var(--primary-soft);
  color: #c8bfff;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 10.5px;
  letter-spacing: 0.06em;
}
.hero-title {
  font-family: var(--f-display);
  font-size: clamp(32px, 4.4vw, 56px);
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1.08;
  margin: 0 0 24px;
  max-width: 16ch;
}
.hero-title .accent {
  color: var(--primary);
  font-style: italic;
  font-weight: 500;
}
.hero-sub {
  font-size: 17px;
  color: var(--fg-dim);
  max-width: 580px;
  margin: 0 0 36px;
  line-height: 1.6;
}
.hero-id {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 12.5px;
  color: var(--fg-muted);
  margin-bottom: 32px;
}
.hero-id .arrow { color: var(--fg-faint); }
.hero-id .now {
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid rgba(139,124,255,0.25);
  padding: 2px 8px;
  border-radius: 4px;
}
.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 56px;
}
.hero-cta-meta {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-faint);
  margin-left: 8px;
}

/* hero side — terminal + sigil */
.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 56px;
  align-items: start;
}
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; }
}

.hero-sigil {
  position: relative;
  aspect-ratio: 1 / 1.05;
  background:
    radial-gradient(circle at 30% 20%, rgba(139,124,255,0.18), transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(77,212,224,0.06), transparent 60%),
    var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.hero-sigil-inner {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-display);
  font-weight: 600;
  font-style: italic;
  color: rgba(255,255,255,0.04);
  font-size: 28vw;
  letter-spacing: -0.05em;
  user-select: none;
}
@media (max-width: 980px) {
  .hero-sigil-inner { font-size: 200px; }
}
.hero-sigil-meta {
  position: absolute;
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--fg-muted);
  letter-spacing: 0.05em;
}
.hero-sigil-meta.tl { top: 16px; left: 16px; }
.hero-sigil-meta.tr { top: 16px; right: 16px; text-align: right; }
.hero-sigil-meta.bl { bottom: 16px; left: 16px; }
.hero-sigil-meta.br { bottom: 16px; right: 16px; text-align: right; }
.hero-sigil-meta .label { color: var(--fg-faint); }
.hero-sigil-meta .val { color: var(--fg-dim); }

/* scanning line */
.hero-sigil::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 80px;
  background: linear-gradient(180deg, transparent, rgba(139,124,255,0.08), transparent);
  animation: scan 5s ease-in-out infinite;
  pointer-events: none;
}
@keyframes scan {
  0% { top: -10%; }
  100% { top: 110%; }
}

/* ─── Now Card 此刻面板 ────────────────────────────────── */
.now-card {
  position: relative;
  background:
    radial-gradient(circle at 30% 20%, rgba(139,124,255,0.18), transparent 50%),
    radial-gradient(circle at 70% 80%, rgba(77,212,224,0.06), transparent 60%),
    var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.now-card::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 80px;
  background: linear-gradient(180deg, transparent, rgba(139,124,255,0.05), transparent);
  animation: scan 5s ease-in-out infinite;
  pointer-events: none;
}
.now-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--fg-dim);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 2px;
}
.now-card-header-dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 6px var(--primary-glow);
  margin-right: 7px;
  vertical-align: middle;
  transform: translateY(-1px);
}
.now-card-live {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 10.5px;
  color: var(--fg-faint);
}
.now-card-live-dot {
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--good);
  animation: now-blink 2s ease-in-out infinite;
}
@keyframes now-blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}
.now-card-rows { flex: 1; }
.now-card-row {
  display: grid;
  grid-template-columns: 28px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hairline);
}
.now-card-row:last-child { border-bottom: none; }
.now-card-icon {
  width: 24px; height: 24px;
  display: flex; align-items: center; justify-content: center;
  background: var(--surface-2);
  border-radius: var(--r-xs);
  font-size: 12px;
  color: var(--fg-muted);
  flex-shrink: 0;
}
.now-card-body { min-width: 0; }
.now-card-label {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--fg-faint);
  letter-spacing: 0.05em;
  margin-bottom: 3px;
}
.now-card-value {
  font-size: 13px;
  color: var(--fg);
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.now-card-badge {
  font-family: var(--f-mono);
  font-size: 10px;
  padding: 2px 7px;
  border-radius: 999px;
  white-space: nowrap;
  flex-shrink: 0;
}
.now-card-badge-primary {
  background: var(--primary-soft);
  color: #c8bfff;
  border: 1px solid rgba(139,124,255,0.25);
}
.now-card-badge-warn {
  background: rgba(248,177,84,0.10);
  color: var(--warn);
  border: 1px solid rgba(248,177,84,0.22);
}
.now-card-meta {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--fg-faint);
  flex-shrink: 0;
  white-space: nowrap;
}
.now-card-socials {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 3px;
}
.now-card-social-item {
  display: flex;
  align-items: baseline;
  gap: 4px;
}
.now-card-social-platform {
  font-size: 10px;
  color: var(--fg-faint);
}
.now-card-social-val {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--fg-dim);
}
.now-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
  margin-top: 2px;
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--fg-faint);
}
.now-card-online {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--good);
}
.now-card-online-dot {
  display: inline-block;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 4px rgba(93,212,154,0.6);
}

/* ─── AI chat module ───────────────────────────────────── */
.chat {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--hairline);
  background: var(--surface-2);
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
}
.chat-head .title {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg-dim);
}
.chat-head .title .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 6px rgba(77,212,224,0.6);
}
.chat-body {
  padding: 18px;
  min-height: 220px;
  max-height: 360px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.1) transparent;
}
.chat-msg {
  max-width: 88%;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.55;
  white-space: pre-wrap;
}
.chat-msg.user {
  align-self: flex-end;
  background: var(--primary-soft);
  border: 1px solid rgba(139,124,255,0.3);
  color: #d8d3ff;
  border-bottom-right-radius: 2px;
}
.chat-msg.bot {
  align-self: flex-start;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  color: var(--fg);
  border-bottom-left-radius: 2px;
}
.chat-msg .who {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--fg-faint);
  margin-bottom: 4px;
  text-transform: uppercase;
}
.chat-msg.bot .who { color: var(--accent); }
.chat-msg.user .who { color: rgba(200,191,255,0.7); }

.chat-suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 18px 14px;
}
.chat-sug {
  font-family: var(--f-mono);
  font-size: 12px;
  padding: 6px 10px;
  border-radius: 999px;
  background: transparent;
  border: 1px solid var(--hairline-strong);
  color: var(--fg-dim);
  cursor: pointer;
  transition: all var(--t-fast);
}
.chat-sug:hover {
  border-color: var(--primary);
  color: var(--fg);
  background: var(--primary-soft);
}
.chat-sug::before { content: "› "; color: var(--fg-faint); }

.chat-input-wrap {
  display: flex;
  gap: 8px;
  padding: 12px;
  border-top: 1px solid var(--hairline);
  background: var(--surface-2);
}
.chat-input {
  flex: 1;
  background: transparent;
  border: 1px solid var(--hairline-strong);
  border-radius: 8px;
  padding: 10px 12px;
  color: var(--fg);
  font-family: var(--f-sans);
  font-size: 14px;
}
.chat-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}
.chat-send {
  padding: 0 16px;
  border-radius: 8px;
  background: var(--primary);
  color: #0a0a14;
  border: none;
  font-family: var(--f-mono);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: filter var(--t-fast);
}
.chat-send:hover { filter: brightness(1.1); }
.chat-send:disabled { opacity: 0.4; cursor: not-allowed; }

.typing {
  display: inline-flex;
  gap: 4px;
}
.typing span {
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--accent);
  animation: typing 1.2s ease-in-out infinite;
}
.typing span:nth-child(2) { animation-delay: 0.15s; }
.typing span:nth-child(3) { animation-delay: 0.3s; }
@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-3px); }
}

/* ─── About / timeline ─────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 880px) {
  .about-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* portrait stack: 1 large + 2 thumbnails */
.portrait-stack {
  position: sticky;
  top: 100px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.portrait-main {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.portrait-ph {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.portrait-main .portrait-ph {
  aspect-ratio: 3 / 4;
}
.portrait-ph-1 {
  background:
    radial-gradient(circle at 40% 30%, rgba(139,124,255,0.2), transparent 60%),
    var(--surface-2);
}
.portrait-ph-2 {
  background:
    radial-gradient(circle at 60% 70%, rgba(77,212,224,0.14), transparent 60%),
    var(--surface-2);
  aspect-ratio: 1 / 1;
}
.portrait-ph-3 {
  background:
    radial-gradient(circle at 50% 50%, rgba(255,107,138,0.10), transparent 60%),
    var(--surface-2);
  aspect-ratio: 1 / 1;
}
.portrait-glyph {
  font-family: var(--f-display);
  font-size: 96px;
  font-weight: 600;
  font-style: italic;
  color: rgba(255,255,255,0.07);
  letter-spacing: -0.05em;
  user-select: none;
}
.portrait-glyph-sm { font-size: 36px; }
.portrait-caption {
  padding: 8px 12px;
  border-top: 1px solid var(--hairline);
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--fg-muted);
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.portrait-dim { color: var(--fg-faint); }
.portrait-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.portrait-thumb {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  overflow: hidden;
}

.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--hairline-bright), transparent);
}
.tl-item {
  position: relative;
  padding-bottom: 36px;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--primary-soft);
  border: 1px solid var(--primary);
}
.tl-item.now::before {
  background: var(--primary);
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-soft), 0 0 16px var(--primary-glow);
}
.tl-period {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-muted);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.tl-period .duration {
  color: var(--fg-faint);
  font-size: 10.5px;
}
.tl-period .now-tag {
  background: var(--primary-soft);
  color: #c8bfff;
  padding: 1px 6px;
  border-radius: 3px;
  border: 1px solid rgba(139,124,255,0.25);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.tl-role {
  font-family: var(--f-display);
  font-size: 22px;
  font-weight: 600;
  color: var(--fg);
  margin: 0 0 4px;
  letter-spacing: -0.01em;
}
.tl-org {
  color: var(--fg-dim);
  font-size: 14px;
  margin-bottom: 10px;
}
.tl-content {
  display: grid;
  grid-template-columns: 1fr 130px;
  gap: 14px;
  margin-top: 10px;
  align-items: start;
}
@media (max-width: 640px) {
  .tl-content { grid-template-columns: 1fr; }
  .tl-tags-col { flex-direction: row; flex-wrap: wrap; }
}
.tl-body-box {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 13px 15px;
}
.tl-body {
  color: var(--fg-muted);
  font-size: 13.5px;
  line-height: 1.65;
  margin: 0;
}
.tl-tags-col {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  padding-top: 3px;
  padding-left: 14px;
  border-left: 1px solid var(--hairline);
}
.tl-tags-col .chip {
  background: var(--primary-soft);
  border: 1px solid var(--primary-soft);
  border-radius: 4px;
  padding: 3px 9px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--primary);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
/* keep .tl-tags for any legacy uses */
.tl-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-top: 12px;
}

/* ─── Projects ─────────────────────────────────────────── */
.proj-filters {
  display: flex;
  gap: 6px;
  padding: 4px;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  font-family: var(--f-mono);
  font-size: 12.5px;
}
.proj-filter {
  padding: 6px 12px;
  border-radius: 7px;
  background: transparent;
  border: none;
  color: var(--fg-muted);
  cursor: pointer;
  transition: all var(--t-fast);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.proj-filter:hover { color: var(--fg); }
.proj-filter.active {
  background: var(--surface-3);
  color: var(--fg);
  box-shadow: 0 1px 0 rgba(255,255,255,0.05) inset;
}
.proj-filter .count {
  font-size: 10.5px;
  color: var(--fg-faint);
  padding: 1px 5px;
  background: rgba(255,255,255,0.04);
  border-radius: 999px;
}

.proj-group {
  margin-bottom: 56px;
}
.proj-group-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 20px;
  font-family: var(--f-mono);
}
.proj-group-head h3 {
  font-family: var(--f-display);
  font-size: 20px;
  margin: 0;
  font-weight: 600;
  color: var(--fg);
}
.proj-group-head .count {
  color: var(--fg-faint);
  font-size: 12px;
}
.proj-group-line {
  flex: 1;
  height: 1px;
  background: var(--hairline);
}

.proj-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.proj-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}
.proj-title-row h4 { margin: 0; }
.proj-link-tag {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--primary);
  background: var(--primary-soft);
  border: 1px solid rgba(139,124,255,0.2);
  border-radius: 999px;
  padding: 2px 8px;
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--t-fast);
  flex-shrink: 0;
}
.proj-link-tag:hover { background: rgba(139,124,255,0.18); }
@media (max-width: 980px) {
  .proj-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .proj-grid { grid-template-columns: 1fr; }
}

.proj-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  overflow: hidden;
  transition: border-color var(--t-base), transform var(--t-base), background var(--t-base);
  text-decoration: none;
  color: inherit;
}
.proj-card:hover {
  border-color: var(--hairline-bright);
  transform: translateY(-2px);
}
.proj-shot {
  aspect-ratio: 16/11;
  background: var(--surface-2);
  border-bottom: 1px solid var(--hairline);
  position: relative;
  overflow: hidden;
}
.proj-shot .grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 24px 24px;
}
.proj-shot .glyph {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 64px;
  color: rgba(255,255,255,0.18);
  letter-spacing: -0.03em;
}
.proj-shot-img {
  position: absolute;
  left: 14px;
  right: 14px;
  top: 38px;
  bottom: 14px;
  width: calc(100% - 28px);
  height: calc(100% - 52px);
  object-fit: cover;
  object-position: top center;
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.5);
}
.proj-shot .corner {
  position: absolute;
  bottom: 10px;
  left: 12px;
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
}
.proj-status {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 2;
}
.proj-body {
  padding: 18px;
}
.proj-body h4 {
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.proj-body p {
  margin: 0 0 14px;
  font-size: 13.5px;
  color: var(--fg-muted);
  line-height: 1.55;
  min-height: 2.6em;
}
.proj-stack {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}
.proj-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 12px;
  border-top: 1px solid var(--hairline);
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-muted);
}
.proj-foot .link {
  color: var(--primary);
  text-decoration: none;
}
.proj-foot .link:hover { text-decoration: underline; }
.proj-foot .stat {
  color: var(--fg-faint);
}
.proj-qr-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--f-mono);
  font-size: 11.5px;
  padding: 0;
}
.proj-qr-pop {
  position: absolute;
  bottom: calc(100% + 10px);
  left: 0;
  background: var(--surface);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  padding: 14px;
  box-shadow: 0 16px 48px rgba(0,0,0,0.6);
  z-index: 20;
  text-align: center;
  width: 180px;
}
.proj-qr-pop img {
  width: 152px;
  height: 152px;
  border-radius: 8px;
  display: block;
}
.proj-qr-pop p {
  margin: 8px 0 0;
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--fg-faint);
  line-height: 1.4;
}

/* ─── Live demo strip ──────────────────────────────────── */
.demo-strip {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
@media (max-width: 880px) {
  .demo-strip { grid-template-columns: 1fr; }
}
.demo {
  background: var(--surface);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-lg);
  overflow: hidden;
}
.demo-head {
  padding: 14px 16px;
  border-bottom: 1px solid var(--hairline);
  background: var(--surface-2);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--f-mono);
  font-size: 12px;
}
.demo-head .lhs {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-weight: 500;
}
.demo-head .live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--good);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.demo-head .live .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--good);
  box-shadow: 0 0 6px rgba(93,212,154,0.6);
  animation: pulse 1.6s ease-in-out infinite;
}
.demo-body {
  padding: 18px;
  min-height: 240px;
}

/* ─── Blog ─────────────────────────────────────────────── */
.blog-tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--hairline);
  margin-bottom: 24px;
  overflow-x: auto;
  scrollbar-width: none;
}
.blog-tabs::-webkit-scrollbar { display: none; }
.blog-tab {
  padding: 12px 16px;
  background: transparent;
  border: none;
  color: var(--fg-muted);
  font-family: var(--f-mono);
  font-size: 13px;
  cursor: pointer;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast), border-color var(--t-fast);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: -1px;
}
.blog-tab:hover { color: var(--fg); }
.blog-tab.active {
  color: var(--fg);
  border-bottom-color: var(--primary);
}
.blog-tab .count {
  font-size: 10.5px;
  color: var(--fg-faint);
  padding: 1px 5px;
  background: var(--surface);
  border-radius: 999px;
}

.blog-list {
  display: flex;
  flex-direction: column;
}
.blog-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 24px;
  padding: 20px 8px;
  border-bottom: 1px solid var(--hairline);
  align-items: baseline;
  text-decoration: none;
  color: inherit;
  transition: background var(--t-fast);
  cursor: pointer;
}
.blog-item:hover {
  background: var(--surface);
}
.blog-item:hover .blog-title { color: var(--primary); }
.blog-date {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
}
.blog-title {
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  transition: color var(--t-fast);
}
.blog-excerpt {
  font-size: 13.5px;
  color: var(--fg-muted);
  line-height: 1.55;
  max-width: 60ch;
  margin: 0;
}
.blog-cat {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--fg-muted);
  text-align: right;
  white-space: nowrap;
}
@media (max-width: 720px) {
  .blog-item { grid-template-columns: 1fr; gap: 6px; }
  .blog-cat { text-align: left; }
}

/* ─── Dashboard ────────────────────────────────────────── */
.dash-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}
@media (max-width: 880px) {
  .dash-grid { grid-template-columns: repeat(2, 1fr); }
}
.dash-cell {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 18px;
  position: relative;
  text-decoration: none;
  color: inherit;
  display: block;
}
.dash-cell--link {
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}
.dash-cell--link:hover {
  border-color: var(--primary);
  background: color-mix(in srgb, var(--primary) 6%, var(--surface));
}
.dash-arrow {
  color: var(--primary);
  font-size: 12px;
}
.qr-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.qr-box {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  padding: 28px 24px 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  max-width: 300px;
  width: 90%;
}
.qr-label {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--fg-faint);
  letter-spacing: 0.06em;
  margin: 0;
}
.qr-img {
  width: 220px;
  height: 220px;
  object-fit: contain;
  border-radius: 8px;
}
.qr-close {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--fg-faint);
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 4px;
  padding: 4px 14px;
  cursor: pointer;
  letter-spacing: 0.06em;
}
.qr-close:hover { border-color: var(--primary); color: var(--fg); }

.dash-cell .label {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--fg-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.dash-cell .value {
  font-family: var(--f-display);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
  line-height: 1;
}
.dash-cell .delta {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--good);
  margin-top: 8px;
}
.dash-cell .delta.down { color: var(--crit); }
.dash-cell svg { display: block; margin-top: 8px; width: 100%; height: 36px; }

.dash-row {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 24px;
}
.dash-row-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 16px;
  font-family: var(--f-mono);
}
.dash-row-head h4 {
  font-family: var(--f-display);
  font-size: 16px;
  font-weight: 600;
  margin: 0;
}
.dash-row-head .meta { font-size: 11px; color: var(--fg-faint); letter-spacing: 0.06em; }

.dash-bars {
  display: flex;
  align-items: flex-end;
  gap: 6px;
  height: 120px;
}
.dash-bars .bar {
  flex: 1;
  background: linear-gradient(180deg, var(--primary), rgba(139,124,255,0.2));
  border-radius: 3px 3px 0 0;
  position: relative;
  transition: opacity var(--t-fast);
}
.dash-bars .bar:hover { opacity: 0.85; }
.dash-bars .bar::after {
  content: attr(data-label);
  position: absolute;
  top: -22px;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--fg-muted);
  opacity: 0;
  transition: opacity var(--t-fast);
  white-space: nowrap;
}
.dash-bars .bar:hover::after { opacity: 1; }

/* ─── Course / signup ──────────────────────────────────── */
.course {
  background:
    radial-gradient(ellipse 800px 400px at 30% 0%, rgba(139,124,255,0.12), transparent 60%),
    var(--surface);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--r-xl);
  overflow: hidden;
  position: relative;
}
.course-head {
  padding: 36px 36px 12px;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 40px;
  align-items: start;
}
@media (max-width: 880px) {
  .course-head { grid-template-columns: 1fr; padding: 28px 24px 12px; }
}
.course-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 10px 5px 8px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: #c8bfff;
  font-family: var(--f-mono);
  font-size: 11.5px;
  border: 1px solid rgba(139,124,255,0.3);
  margin-bottom: 16px;
}
.course-eyebrow .pulse {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--primary);
  box-shadow: 0 0 8px var(--primary-glow);
  animation: pulse 1.4s ease-in-out infinite;
}
.course-title {
  font-family: var(--f-display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0 0 12px;
}
.course-sub {
  color: var(--fg-dim);
  font-size: 15px;
  margin: 0 0 20px;
  line-height: 1.6;
  max-width: 50ch;
}
.course-facts {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 8px;
}
.course-fact {
  padding: 12px 14px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
}
.course-fact .k {
  font-family: var(--f-mono);
  font-size: 10.5px;
  color: var(--fg-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
.course-fact .v {
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 600;
  color: var(--fg);
  letter-spacing: -0.01em;
}
.course-fact .v small {
  font-size: 12px;
  color: var(--fg-muted);
  font-weight: 400;
  margin-left: 4px;
}

.course-form {
  background: rgba(0,0,0,0.3);
  border: 1px solid var(--hairline);
  border-radius: var(--r-lg);
  padding: 22px;
}
.course-form h4 {
  font-family: var(--f-display);
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 4px;
}
.course-form .seats {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-muted);
  margin-bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.course-form .seats .meter {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.06);
  border-radius: 999px;
  overflow: hidden;
  max-width: 120px;
}
.course-form .seats .meter span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  border-radius: 999px;
}
.form-row {
  margin-bottom: 12px;
}
.form-row label {
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--fg-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.course-success {
  text-align: center;
  padding: 24px;
  font-family: var(--f-mono);
  color: var(--good);
}
.course-success .glyph {
  font-size: 28px;
  margin-bottom: 10px;
}

.course-curriculum {
  padding: 16px 36px 36px;
  border-top: 1px solid var(--hairline);
  margin-top: 24px;
}
@media (max-width: 880px) {
  .course-curriculum { padding: 16px 24px 28px; }
}
.course-curriculum h5 {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-faint);
  margin: 16px 0 12px;
}
.curr-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
@media (max-width: 720px) {
  .curr-grid { grid-template-columns: 1fr; }
}
.curr-cell {
  padding: 14px;
  background: rgba(0,0,0,0.25);
  border: 1px solid var(--hairline);
  border-radius: var(--r-md);
  font-size: 13.5px;
  color: var(--fg-dim);
}
.curr-cell .day {
  font-family: var(--f-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 6px;
}
.curr-cell .topic {
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--fg);
  margin-bottom: 4px;
}

/* ─── Blog cards (homepage) ───────────────────────────────── */
.blog-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 20px;
}
.blog-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 20px 16px;
  border: 1px solid var(--hairline);
  border-left: 3px solid var(--primary);
  border-radius: var(--r-lg);
  background: var(--surface);
  text-decoration: none;
  color: inherit;
  transition: background var(--t-fast), border-left-color var(--t-fast);
}
.blog-card:hover {
  background: var(--surface-2, rgba(255,255,255,0.04));
  border-left-color: var(--accent, var(--primary));
}
.blog-card:hover .blog-card-title { color: var(--primary); }
.blog-card-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.blog-card-date {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--fg-faint);
  letter-spacing: 0.04em;
}
.blog-card-title {
  font-family: var(--f-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.45;
  margin: 0;
  transition: color var(--t-fast);
}
.blog-card-excerpt {
  font-size: 13px;
  color: var(--fg-muted);
  line-height: 1.6;
  flex: 1;
  margin: 0;
  border-left: 2px solid var(--hairline);
  padding-left: 10px;
}
.blog-card-foot {
  font-family: var(--f-mono);
  font-size: 11.5px;
  color: var(--fg-faint);
  text-align: right;
}
.blog-card-arrow {
  opacity: 0.5;
}
.blog-more-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--fg-muted);
  text-decoration: none;
  padding: 8px 0;
  transition: color var(--t-fast);
}
.blog-more-link:hover { color: var(--primary); }
@media (max-width: 720px) {
  .blog-cards { grid-template-columns: 1fr; }
}