/* ================================
   Conan AI Project Cinema — CP-1B
   Visual: Late-night research lab
   + AI OS + project screening room
   ================================ */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400;500;600&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

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

:root {
  --bg-primary: #0a0b0f;
  --bg-secondary: #12141a;
  --bg-card: #181b23;
  --bg-card-hover: #1e222b;
  --border: #2a2e3a;
  --border-bright: #3d4255;
  --text-primary: #e8eaf0;
  --text-secondary: #9ba3b8;
  --text-muted: #5a6275;
  --accent: #7eb8f7;
  --accent-dim: rgba(126, 184, 247, 0.15);
  --accent-glow: rgba(126, 184, 247, 0.3);
  --terminal-green: #7ee8a0;
  --terminal-dim: #4a6b52;
  --terminal-yellow: #f7e07e;
  --status-green: #7ee8a0;
  --status-yellow: #f7e07e;
  --status-red: #f77e7e;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-size-base: 16px;
  --scene-padding: clamp(4rem, 8vw, 8rem);
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
  background: var(--bg-primary);
  color: var(--text-primary);
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
}

/* --- Draft Watermark --- */
.draft-watermark {
  position: fixed;
  bottom: 1rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  pointer-events: none;
  z-index: 10;
  opacity: 0.6;
}

/* --- Draft Status Badge --- */
.draft-badge {
  position: fixed;
  top: 1.2rem;
  right: 1.5rem;
  z-index: 100;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.3rem;
  letter-spacing: 0.04em;
}
.badge-tag {
  color: var(--terminal-yellow);
  background: rgba(247, 224, 126, 0.1);
  padding: 0.15rem 0.5rem;
  border: 1px solid rgba(247, 224, 126, 0.3);
  border-radius: 3px;
}
.badge-sep { color: var(--text-muted); }
.badge-phase { color: var(--text-secondary); }

/* --- Scroll Progress Bar --- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  z-index: 200;
  transition: width 0.1s linear;
  box-shadow: 0 0 8px var(--accent-glow);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: var(--scene-padding);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 50%, rgba(126, 184, 247, 0.04) 0%, transparent 70%),
    radial-gradient(circle at 20% 80%, rgba(126, 184, 247, 0.03) 0%, transparent 40%);
  pointer-events: none;
}

/* Scanline effect for cinematic feel */
.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
  pointer-events: none;
  opacity: 0.5;
}

.hero-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.label-bracket { color: var(--text-muted); }

.hero-title {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
  line-height: 1.1;
  text-shadow: 0 0 40px rgba(126, 184, 247, 0.15);
}

.hero-sub-cn {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  color: var(--text-secondary);
  margin-bottom: 0.6rem;
  font-weight: 300;
}

.hero-sub-en {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-style: italic;
}

.hero-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 3rem;
}
.meta-sep { color: var(--border-bright); }

.hero-scroll-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(4px); opacity: 1; }
}

/* --- Scene (shared) --- */
.scene {
  padding: var(--scene-padding) clamp(1.5rem, 5vw, 6rem);
  position: relative;
}

.scene::before {
  content: '';
  position: absolute;
  left: clamp(1.5rem, 5vw, 6rem);
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border) 20%, var(--border) 80%, transparent);
  pointer-events: none;
}

.scene-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  gap: 3rem;
}

/* Scene enter animation */
.scene {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.scene.visible {
  opacity: 1;
  transform: translateY(0);
}

.scene-number {
  font-family: var(--font-mono);
  font-size: clamp(4rem, 10vw, 8rem);
  font-weight: 300;
  color: var(--border);
  line-height: 1;
  letter-spacing: -0.05em;
  grid-column: 1;
  align-self: start;
}

.scene-text {
  grid-column: 2;
}

.scene-heading {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.5rem);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 1.2rem;
  letter-spacing: -0.01em;
}

.scene-body-cn {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: 0.8rem;
  line-height: 1.9;
  font-weight: 300;
}

.scene-body-en {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-muted);
  font-style: italic;
  line-height: 1.7;
}

/* Scene 01 — Artifact Cards */
.scene-artifacts {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.artifact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem 1rem;
  text-align: center;
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
}
.artifact-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.artifact-icon {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.artifact-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* Scene 02 — Terminals */
.scene-terminals {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
}

.terminal-window {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.terminal-titlebar {
  background: #1a1d26;
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.tb-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}
.tb-red { background: #f77e7e; }
.tb-yellow { background: #f7e07e; }
.tb-green { background: #7ee8a0; }

.tb-title {
  margin-left: 0.5rem;
  color: var(--text-muted);
  font-size: 0.72rem;
}

.terminal-body {
  padding: 1rem 1.2rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.tb-line {
  color: var(--text-secondary);
  line-height: 1.6;
}
.tb-prompt { color: var(--terminal-green); margin-right: 0.5rem; }
.tb-comment { color: var(--text-muted); font-style: italic; }
.tb-success { color: var(--terminal-green); }
.tb-hash {
  color: var(--accent);
  background: var(--accent-dim);
  border-radius: 3px;
  padding: 0.05rem 0.3rem;
  font-size: 0.72rem;
  margin-right: 0.5rem;
}
.tb-sample {
  color: var(--text-muted);
  font-style: italic;
  opacity: 0.7;
}

/* Scene 03 — Project Grid */
.artifact-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  cursor: pointer;
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
  position: relative;
  text-decoration: none;
  color: inherit;
  display: block;
}
.project-card.concept-card {
  opacity: 0.65;
  border-style: dashed;
}
.project-card.concept-card:hover {
  opacity: 0.85;
}

.project-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.project-card::after {
  content: 'Click to expand';
  position: absolute;
  bottom: 0.6rem;
  right: 0.8rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  opacity: 0;
  transition: opacity 0.2s;
}
.project-card:hover::after { opacity: 1; }

.pc-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}

.pc-tag {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  letter-spacing: 0.04em;
}

.pc-status {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}
.status-active { color: var(--status-green); background: rgba(126, 232, 160, 0.1); border: 1px solid rgba(126, 232, 160, 0.2); }
.status-standby { color: var(--terminal-yellow); background: rgba(247, 224, 126, 0.1); border: 1px solid rgba(247, 224, 126, 0.2); }
.status-done { color: var(--text-muted); background: rgba(90, 98, 117, 0.2); border: 1px solid var(--border); }
.status-concept { color: var(--text-muted); background: rgba(90, 98, 117, 0.15); border: 1px solid var(--border); border-style: dashed; }
.status-private { color: var(--text-muted); background: rgba(90, 98, 117, 0.15); border: 1px solid var(--border); }
.private-card { opacity: 0.7; border-style: dashed; }
.private-card:hover { opacity: 0.9; }

.pc-title {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.pc-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Scene 04 — Agent Strip */
.agent-strip {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0;
  overflow-x: auto;
  padding: 0.5rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.agent-node {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  min-width: 140px;
  text-align: center;
  transition: border-color 0.3s;
  flex-shrink: 0;
}
.agent-node:hover { border-color: var(--accent); }

.an-avatar {
  font-size: 1.8rem;
  margin-bottom: 0.5rem;
}

.an-name {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  margin-bottom: 0.4rem;
}

.an-status {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
  margin-bottom: 0.3rem;
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}
.dot-green { background: var(--status-green); box-shadow: 0 0 4px var(--status-green); }
.dot-yellow { background: var(--status-yellow); box-shadow: 0 0 4px var(--status-yellow); }
.dot-red { background: var(--status-red); box-shadow: 0 0 4px var(--status-red); }

.an-desc {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  line-height: 1.4;
  margin-bottom: 0.5rem;
  text-align: left;
}
.an-hash {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent);
  background: var(--accent-dim);
  border-radius: 3px;
  padding: 0.05rem 0.4rem;
}

.agent-arrow {
  font-family: var(--font-mono);
  color: var(--text-muted);
  font-size: 1.2rem;
  padding: 0 0.8rem;
  flex-shrink: 0;
}

/* Scene 05 — Control Tower */
.control-tower {
  grid-column: 1 / -1;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
}

.tower-header {
  background: #1a1d26;
  padding: 0.8rem 1.2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.tower-title { color: var(--text-primary); font-weight: 500; }
.tower-status { color: var(--status-green); display: flex; align-items: center; gap: 0.4rem; }

.tower-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-bottom: 1px solid var(--border);
}

.tm-item {
  padding: 1.2rem;
  border-right: 1px solid var(--border);
  text-align: center;
}
.tm-item:last-child { border-right: none; }

.tm-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.4rem;
}

.tm-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
}

.tm-ok {
  color: var(--status-green);
  font-size: 1rem;
  padding-top: 0.2rem;
}
.tm-sample {
  color: var(--text-secondary) !important;
  font-size: 1.2rem;
}
.tm-note {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}

.tower-log {
  padding: 1rem 1.2rem;
}

.log-entry {
  display: flex;
  gap: 1rem;
  padding: 0.3rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  border-bottom: 1px solid rgba(42, 46, 58, 0.5);
}
.log-entry:last-child { border-bottom: none; }
.log-time { color: var(--text-muted); min-width: 80px; }
.log-msg { color: var(--text-secondary); }
.log-warn .log-msg { color: var(--terminal-yellow); }
.log-sample .log-time { color: var(--terminal-yellow); font-style: italic; }
.log-sample .log-msg { color: var(--text-muted); font-style: italic; }

/* Constellation */
.constellation {
  position: relative;
  height: 200px;
  border-top: 1px solid var(--border);
  margin-top: 0;
}

.const-lines {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}
.const-lines line {
  stroke: var(--accent);
  stroke-width: 0.5;
  opacity: 0.25;
}

.const-node {
  position: absolute;
  left: var(--cx);
  top: var(--cy);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent-glow);
  cursor: pointer;
  transform: translate(-50%, -50%);
  transition: transform 0.3s, box-shadow 0.3s;
}
.const-node:hover {
  transform: translate(-50%, -50%) scale(1.5);
  box-shadow: 0 0 16px var(--accent-glow);
}

.const-node::after {
  content: attr(data-label);
  position: absolute;
  left: 14px;
  top: -4px;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-muted);
  white-space: nowrap;
  opacity: 0;
  transition: opacity 0.2s;
}
.const-node:hover::after { opacity: 1; }

/* Scene 06 — CTA Grid */
.cta-grid {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.cta-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.8rem 1rem;
  text-align: center;
  text-decoration: none;
  color: var(--text-primary);
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
}
.cta-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-3px);
}

.cta-icon { font-size: 2rem; }
.cta-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

/* --- Artifact Archive Grid (Scene 06) --- */
.artifact-type-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.72rem;
}
.atb-label { color: var(--text-muted); }
.atb-tag {
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  padding: 0.2rem 0.6rem;
  border-radius: 20px;
  cursor: default;
}
.atb-tag.atb-active {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-dim);
}

.artifact-archive-grid {
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
}

.artifact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.2rem;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color 0.3s, background 0.3s, transform 0.3s;
}
.artifact-card:hover {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.ac-type { margin-bottom: 0.2rem; }
.ac-type-tag {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.ac-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.3;
}
.ac-source {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent);
}
.ac-desc {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.5;
  flex-grow: 1;
}
.ac-status {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  padding-top: 0.4rem;
  margin-top: 0.2rem;
}

/* --- Credits --- */
.credits {
  padding: 4rem clamp(1.5rem, 5vw, 6rem);
  border-top: 1px solid var(--border);
  text-align: center;
}

.credits-inner {
  max-width: 600px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.credit-line {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}
.credit-phase { color: var(--text-secondary); }
.credit-note { color: var(--text-muted); font-size: 0.7rem; font-style: italic; }

/* --- Expand Tooltip --- */
.expand-tooltip {
  position: fixed;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: 8px;
  padding: 0.8rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-primary);
  max-width: 360px;
  text-align: center;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 16px var(--accent-dim);
  z-index: 300;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.expand-tooltip.show {
  opacity: 1;
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .scene { opacity: 1 !important; transform: none !important; transition: none !important; }
  .hero-scroll-hint { animation: none !important; }
  .const-node { transition: none !important; }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .scene::before { display: none; }
  .scene-inner { grid-template-columns: 1fr; }
  .scene-number { font-size: 3.5rem; grid-column: 1; }
  .agent-strip { flex-direction: column; align-items: stretch; }
  .agent-arrow { text-align: center; padding: 0.3rem 0; transform: rotate(90deg); }
  .tower-metrics { grid-template-columns: repeat(2, 1fr); }
  .draft-badge { font-size: 0.62rem; right: 1rem; }
}

/* --- 375px Mobile Check --- */
@media (max-width: 400px) {
  .cta-grid { grid-template-columns: repeat(2, 1fr); }
  .artifact-archive-grid { grid-template-columns: 1fr; }
  .artifact-grid { grid-template-columns: 1fr; }
  .scene-terminals { grid-template-columns: 1fr; }
  .scene-artifacts { grid-template-columns: repeat(2, 1fr); }
}

/* --- Accessibility: Focus Visible --- */
*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* --- Accessibility: Increased touch targets on mobile --- */
@media (max-width: 768px) {
  .project-card, .artifact-card, .cta-card, .agent-node {
    min-height: 44px;
  }
}

/* --- Filter Chips (Artifact Archive) --- */
.artifact-filters {
  grid-column: 1 / -1;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
}

.filter-chip {
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.filter-chip:hover {
  border-color: var(--accent);
  color: var(--text-secondary);
}
.filter-chip.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}
.filter-chip:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* --- Empty State (Artifact Archive) --- */
.artifact-empty-state {
  grid-column: 1 / -1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 3rem 1rem;
  color: var(--text-muted);
  text-align: center;
}
.aes-icon {
  font-size: 2.5rem;
  opacity: 0.5;
  margin-bottom: 0.5rem;
}
.aes-text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.aes-sub {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}

/* --- External Link Arrow (small affordance) --- */
.artifact-card[target="_blank"]::after,
.cta-card[target="_blank"]::after {
  content: '';
  display: inline-block;
  width: 0;
  height: 0;
  border-left: 3px solid transparent;
  border-right: 3px solid transparent;
  border-top: 3px solid var(--text-muted);
  margin-left: 4px;
  vertical-align: middle;
  opacity: 0.5;
}

/* --- No-link artifact card (Internal/private items) --- */
.artifact-card--no-link {
  opacity: 0.65;
  border-style: dashed;
  cursor: default;
}
.artifact-card--no-link:hover {
  opacity: 0.85;
  transform: translateY(-2px);
  border-color: var(--border-bright);
}

/* --- Project Grid container --- */
#projectGrid {
  grid-column: 1 / -1;
}

/* --- Filter bar mobile: horizontal scroll --- */
@media (max-width: 480px) {
  .artifact-filters {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 0.5rem;
  }
  .artifact-filters::-webkit-scrollbar {
    display: none;
  }
  .filter-chip {
    flex-shrink: 0;
  }
}

/* ── CP-1D: Artifact Search ──────────────────────────────── */
.artifact-search-row {
  grid-column: 1 / -1;
  margin-bottom: 0.5rem;
}

.search-wrap {
  position: relative;
  display: inline-block;
  width: 100%;
  max-width: 380px;
}

.artifact-search {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 0.45rem 2.2rem 0.45rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
  appearance: none;
}
.artifact-search::placeholder {
  color: var(--text-muted);
  font-style: italic;
}
.artifact-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.artifact-search::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.search-clear {
  position: absolute;
  right: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.7rem;
  padding: 0.2rem 0.3rem;
  border-radius: 50%;
  line-height: 1;
  transition: color 0.2s;
}
.search-clear:hover {
  color: var(--text-primary);
}
.search-clear:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

/* ── CP-1D: Constellation Tooltip ──────────────────────────── */
.const-tooltip {
  position: fixed;
  z-index: 500;
  background: var(--bg-card);
  border: 1px solid var(--border-bright);
  border-radius: 10px;
  padding: 0.8rem 1rem;
  min-width: 160px;
  max-width: 260px;
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 12px var(--accent-dim);
}

.ct-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.25rem;
}
.ct-status {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--status-green);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.35rem;
}
.ct-desc {
  font-size: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 0.35rem;
}
.ct-open {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  border-top: 1px solid var(--border);
  padding-top: 0.35rem;
  margin-top: 0.1rem;
}
.ct-internal {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  font-style: italic;
  border-top: 1px solid var(--border);
  padding-top: 0.35rem;
  margin-top: 0.1rem;
}

/* ── CP-1D: Mobile Polish ─────────────────────────────────── */

/* 375px hero polish */
@media (max-width: 400px) {
  .hero-title {
    font-size: clamp(1.6rem, 8vw, 2.5rem);
  }
  .hero-sub-cn {
    font-size: 0.95rem;
  }
  .hero-meta {
    font-size: 0.65rem;
    flex-wrap: wrap;
    gap: 0.3rem;
  }
}

/* Mobile search row */
@media (max-width: 480px) {
  .artifact-search-row {
    margin-bottom: 0.3rem;
  }
  .search-wrap {
    max-width: 100%;
  }
  .artifact-search {
    font-size: 0.75rem;
    padding: 0.4rem 2rem 0.4rem 0.9rem;
  }
}

/* Mobile constellation tooltip clamp */
@media (max-width: 480px) {
  .const-tooltip {
    max-width: 200px;
  }
  .const-node {
    width: 12px;
    height: 12px;
  }
}

/* Mobile CTA 2x2 */
@media (max-width: 400px) {
  .cta-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cta-card {
    padding: 1.2rem 0.8rem;
  }
  .cta-icon {
    font-size: 1.5rem;
  }
}