/* ============ 深色 AI 实验室 ============ */
:root {
  color-scheme: dark;
  --bg: #070b14;
  --bg-soft: #0b1120;
  --ink: #e6edf7;
  --ink-dim: #8b97ad;
  --ink-faint: #4d586e;
  --cyan: #22d3ee;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --line: rgba(139, 151, 173, 0.16);
  --mono: "JetBrains Mono", "SFMono-Regular", ui-monospace, Menlo, monospace;
  --sans: "Inter", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: auto;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: rgba(34, 211, 238, 0.35);
}

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

.entity-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink);
  transition: color 0.18s ease;
}

.entity-link::after {
  content: "↗";
  font-family: var(--mono);
  font-size: 10px;
  color: var(--cyan);
  opacity: 0.72;
  transform: translateY(-1px);
}

.entity-link:hover {
  color: var(--cyan);
}

/* ============ 底层画布与氛围 ============ */
#mind-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(139, 151, 173, 0.13) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(ellipse 90% 80% at 50% 45%, black 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 90% 80% at 50% 45%, black 30%, transparent 100%);
}

/* ============ HUD ============ */
.hud {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 28px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  background: linear-gradient(to bottom, rgba(7, 11, 20, 0.85), transparent);
  pointer-events: none;
}

.hud-id {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hud-name {
  color: var(--ink);
  font-weight: 700;
}

.hud-sub {
  color: var(--ink-faint);
  font-size: 10px;
}

.hud-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--cyan);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: pulse 2.2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

/* ============ 会话进度轨 ============ */
#session-rail {
  position: fixed;
  right: 22px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 30;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.rail-node {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-direction: row-reverse;
  background: none;
  border: 0;
  padding: 6px 0;
  cursor: pointer;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  color: var(--ink-faint);
  transition: color 0.3s;
}

.rail-node::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  border: 1px solid var(--ink-faint);
  transition: all 0.3s;
  flex: none;
}

.rail-node .rail-label {
  opacity: 0;
  transform: translateX(6px);
  transition: all 0.3s;
}

.rail-node:hover .rail-label {
  opacity: 1;
  transform: none;
}

.rail-node.active {
  color: var(--cyan);
}

.rail-node.active::after {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 12px var(--cyan);
}

.rail-node.active .rail-label {
  opacity: 1;
  transform: none;
}

/* ============ 对话轮次 ============ */
main {
  position: relative;
  z-index: 10;
}

.round {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 72px 7vw;
}

.round-inner {
  width: min(640px, 100%);
  position: relative;
}

.round[data-side="-1"] .round-inner { margin-left: auto; }
.round[data-side="1"] .round-inner { margin-right: auto; }
.round[data-side="0"] .round-inner { margin: 0 auto; }

/* 提问气泡（访客） */
.q-bubble {
  display: inline-flex;
  align-items: baseline;
  margin-left: auto;
  margin-bottom: 24px;
  padding: 12px 20px;
  border: 1px solid rgba(34, 211, 238, 0.45);
  border-radius: 18px 18px 4px 18px;
  font-family: var(--mono);
  font-size: 15px;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.05);
  min-height: 46px;
  min-width: 60px;
}

.q-row {
  display: flex;
  justify-content: flex-end;
}

.q-caret {
  display: inline-block;
  width: 8px;
  height: 1.1em;
  margin-left: 4px;
  background: var(--cyan);
  transform: translateY(2px);
  animation: blink 0.9s steps(1) infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* 思考态 */
.thinking {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--violet);
  opacity: 0;
}

.thinking .dots {
  display: inline-flex;
  gap: 5px;
}

.thinking .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--violet);
  animation: think 1.1s ease-in-out infinite;
}

.thinking .dot:nth-child(2) { animation-delay: 0.18s; }
.thinking .dot:nth-child(3) { animation-delay: 0.36s; }

@keyframes think {
  0%, 100% { transform: translateY(0); opacity: 0.4; }
  50% { transform: translateY(-5px); opacity: 1; }
}

/* 回答块 */
.answer {
  position: relative;
  padding-left: 26px;
  opacity: 0;
}

.answer::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--cyan), var(--violet));
  box-shadow: 0 0 14px rgba(167, 139, 250, 0.5);
}

.a-caret {
  display: inline-block;
  margin-top: 14px;
  color: var(--violet);
  font-family: var(--mono);
  animation: blink 1s steps(1) infinite;
}

.a-title {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--violet);
  margin-bottom: 18px;
  text-transform: uppercase;
}

/* ============ Round 0: BOOT ============ */
#r-boot .round-inner {
  width: min(760px, 100%);
}

.boot-greeting {
  font-size: clamp(34px, 5.4vw, 58px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  min-height: 1.2em;
}

.boot-greeting .grad {
  background: linear-gradient(100deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.boot-identity {
  margin-top: 20px;
  font-family: var(--mono);
  font-size: 14px;
  color: var(--ink-dim);
}

.boot-identity em {
  font-style: normal;
  color: var(--cyan);
}

.metric-stream {
  margin-top: 44px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.metric-token {
  font-family: var(--mono);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 16px;
  background: rgba(11, 17, 32, 0.7);
  backdrop-filter: blur(6px);
}

.metric-token .v {
  color: var(--amber);
  font-weight: 700;
  font-size: 17px;
}

.metric-token .l {
  display: block;
  font-size: 11px;
  color: var(--ink-dim);
  margin-top: 2px;
}

.boot-hint {
  margin-top: 56px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  display: flex;
  align-items: center;
  gap: 12px;
}

.boot-hint::after {
  content: "↓";
  animation: bob 1.6s ease-in-out infinite;
}

@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(6px); }
}

/* ============ Round 1: 概述 ============ */
.signal-line {
  display: flex;
  gap: 14px;
  margin-bottom: 18px;
  font-size: 16px;
  color: var(--ink);
}

.signal-line .idx {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-faint);
  padding-top: 5px;
  flex: none;
}

/* ============ Round 2: 焦点卡 ============ */
.focus-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.focus-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 20px;
  background: rgba(11, 17, 32, 0.72);
  backdrop-filter: blur(8px);
  transition: border-color 0.3s;
}

.focus-card:hover {
  border-color: rgba(34, 211, 238, 0.4);
}

.focus-card h3 {
  font-size: 16px;
  margin-bottom: 8px;
  color: var(--ink);
}

.focus-card p {
  font-size: 13px;
  color: var(--ink-dim);
  margin-bottom: 12px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag {
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid rgba(167, 139, 250, 0.35);
  color: var(--violet);
}

/* ============ Round 3: 项目 ============ */
.project-block {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 24px;
  margin-bottom: 18px;
  background: rgba(11, 17, 32, 0.78);
  backdrop-filter: blur(8px);
}

.project-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 6px;
}

.project-head img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  object-fit: cover;
  background: var(--bg-soft);
}

.project-head .name {
  font-size: 18px;
  font-weight: 700;
}

.project-meta {
  min-width: 0;
  flex: 1 1 220px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.project-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.mini-link {
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.4;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid rgba(34, 211, 238, 0.28);
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.06);
  transition: border-color 0.18s ease, background 0.18s ease;
}

.mini-link:hover {
  border-color: rgba(34, 211, 238, 0.62);
  background: rgba(34, 211, 238, 0.12);
}

.project-head .period {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}

.project-sub {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--cyan);
  margin-bottom: 10px;
}

.project-summary {
  font-size: 13.5px;
  color: var(--ink-dim);
  margin-bottom: 14px;
}

.project-modules {
  list-style: none;
  margin-bottom: 14px;
}

.project-modules li {
  position: relative;
  padding-left: 18px;
  font-size: 13px;
  color: var(--ink);
  margin-bottom: 7px;
}

.project-modules li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--violet);
}

/* ============ Round 4: 技能 ============ */
.skill-group {
  margin-bottom: 20px;
}

.skill-group .g-name {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--ink-faint);
  margin-bottom: 8px;
  text-transform: uppercase;
}

.skill-token {
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: rgba(11, 17, 32, 0.7);
  color: var(--ink);
  display: inline-block;
}

.skill-token.hot {
  border-color: rgba(34, 211, 238, 0.5);
  color: var(--cyan);
}

/* ============ Round 5: 经历 ============ */
.exp-item {
  position: relative;
  padding: 0 0 30px 30px;
}

.exp-item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: -4px;
  width: 1px;
  background: var(--line);
}

.exp-item:last-child::before { bottom: auto; height: calc(100% - 8px); }

.exp-item::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 10px rgba(34, 211, 238, 0.6);
}

.exp-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.exp-head img {
  width: 26px;
  height: 26px;
  border-radius: 7px;
  object-fit: cover;
}

.exp-head .co {
  font-weight: 600;
  font-size: 15px;
}

.exp-head .period {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-faint);
}

.exp-role {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--violet);
  margin: 4px 0 8px;
}

.exp-points {
  list-style: none;
}

.exp-points li {
  font-size: 13px;
  color: var(--ink-dim);
  margin-bottom: 5px;
  padding-left: 16px;
  position: relative;
}

.exp-points li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--ink-faint);
}

/* ============ Round 6: 联系 ============ */
.contact-lead {
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  margin-bottom: 12px;
}

.contact-id {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink-dim);
  margin-bottom: 28px;
}

.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.contact-btn {
  font-family: var(--mono);
  font-size: 13px;
  padding: 12px 22px;
  border-radius: 10px;
  border: 1px solid var(--line);
  color: var(--ink);
  transition: all 0.3s;
}

.contact-btn.primary {
  border-color: var(--cyan);
  color: #06222b;
  background: var(--cyan);
  box-shadow: 0 0 24px rgba(34, 211, 238, 0.35);
}

.contact-btn:not(.primary):hover {
  border-color: var(--violet);
  color: var(--violet);
}

.session-end {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ink-faint);
  display: flex;
  align-items: center;
  gap: 12px;
}

.session-end::before,
.session-end::after {
  content: "";
  height: 1px;
  flex: 1;
  background: var(--line);
}

/* ============ 响应式 ============ */
@media (max-width: 880px) {
  .round {
    padding: 80px 6vw;
    align-items: flex-end;
  }

  .round-inner {
    width: 100%;
  }

  .focus-grid {
    grid-template-columns: 1fr;
  }

  #session-rail {
    right: auto;
    top: 54px;
    left: 50%;
    transform: translateX(-50%);
    flex-direction: row;
    gap: 14px;
  }

  .rail-node .rail-label { display: none; }

  .hud { padding: 14px 18px; }

  .project-head .period {
    margin-left: 0;
    width: 100%;
  }
}

/* ============ 降级 ============ */
@media (prefers-reduced-motion: reduce) {
  .q-caret, .a-caret, .status-dot, .thinking .dot, .boot-hint::after {
    animation: none;
  }

  .thinking { display: none; }
  .answer { opacity: 1; }
}