/* =====================================================
   Rayson Meng · Resume
   Warm minimal · Anthropic-inspired editorial
   ===================================================== */

:root {
  --bg: #F0EEE6;
  --bg-elev: #FAF8F2;
  --bg-deep: #E8E4D8;
  --bg-chat: #FAF8F2;
  --bg-msg-bot: #F0EEE6;
  --bg-msg-user: #2D4A3E;

  --text: #1F1E1B;
  --text-2: #5E5B54;
  --text-3: #94918A;
  --text-on-dark: #F0EEE6;

  --accent: #CC785C;
  --accent-deep: #B85A3E;
  --accent-soft: rgba(204, 120, 92, 0.10);

  --green: #2D4A3E;
  --green-soft: rgba(45, 74, 62, 0.08);

  --border: rgba(31, 30, 27, 0.12);
  --border-strong: rgba(31, 30, 27, 0.20);

  --font-serif: 'Newsreader', 'Source Serif Pro', 'Iowan Old Style', Georgia, serif;
  --font-sans: ui-sans-serif, system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --max-w: 880px;
  --pad-x: 2.5rem;

  --radius: 8px;
  --radius-lg: 14px;
}

[data-theme="dark"] {
  --bg: #1A1816;
  --bg-elev: #25221E;
  --bg-deep: #1F1D1A;
  --bg-chat: #25221E;
  --bg-msg-bot: #2A2723;
  --bg-msg-user: #4A6E5C;

  --text: #F0EEE6;
  --text-2: #B5B0A6;
  --text-3: #7E7B72;

  --accent: #E89171;
  --accent-deep: #CC785C;
  --accent-soft: rgba(232, 145, 113, 0.12);

  --green: #6FA68B;
  --green-soft: rgba(111, 166, 139, 0.10);

  --border: rgba(240, 238, 230, 0.10);
  --border-strong: rgba(240, 238, 230, 0.18);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.3s ease, color 0.3s ease;
}

body {
  background-image:
    radial-gradient(circle at 18% 12%, rgba(204, 120, 92, 0.04), transparent 38%),
    radial-gradient(circle at 82% 70%, rgba(45, 74, 62, 0.04), transparent 42%);
  background-attachment: fixed;
  min-height: 100vh;
}

[data-theme="dark"] body {
  background-image:
    radial-gradient(circle at 18% 12%, rgba(232, 145, 113, 0.05), transparent 38%),
    radial-gradient(circle at 82% 70%, rgba(111, 166, 139, 0.04), transparent 42%);
}

::selection { background: var(--accent); color: #FAF8F2; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 0.5px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding-bottom: 1px;
  transition: color 0.2s, border-color 0.2s;
}
a:hover { color: var(--accent-deep); border-bottom-color: var(--accent-deep); }

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 4rem var(--pad-x) 3rem;
}

/* =====================================================
   Top controls (view toggle + theme toggle)
   ===================================================== */

.top-controls {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 10;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.view-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 36px;
  padding: 0 14px 0 16px;
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3px;
  cursor: pointer;
  /* default invisible 但占 layout，让 chooser morph 能测到目标位置 */
  visibility: hidden;
  opacity: 0;
  transform: scale(0.7);
  pointer-events: none;
  transition:
    opacity 0.35s ease 0.3s,
    transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) 0.3s,
    color 0.2s,
    border-color 0.2s,
    background 0.2s;
}
body[data-view] .view-toggle {
  visibility: visible;
  opacity: 1;
  transform: none;
  pointer-events: auto;
}
body[data-view] .view-toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}
.view-toggle svg { opacity: 0.65; transition: opacity 0.2s; }
.view-toggle:hover svg { opacity: 1; }

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: 50%;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.2s ease;
}
.theme-toggle:hover {
  color: var(--accent);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}

/* =====================================================
   View switching (chat vs resume)
   ===================================================== */

/* default 在 chooser 没结束时不显示任何 view */
body:not([data-view]) .chat,
body:not([data-view]) .journey,
body:not([data-view]) .project,
body:not([data-view]) .techstack {
  /* hero 留着让 chooser backdrop 看着不太空 */
}

body[data-view="chat"] .hero,
body[data-view="chat"] .journey,
body[data-view="chat"] .project,
body[data-view="chat"] .techstack,
body[data-view="chat"] .footer {
  display: none;
}

/* chat 视图：chat 框撑满 viewport 高度 */
body[data-view="chat"] {
  height: 100vh;
  overflow: hidden;
}
body[data-view="chat"] .container {
  padding-top: 4.5rem;
  padding-bottom: 2rem;
  height: 100vh;
  display: flex;
  flex-direction: column;
  max-width: min(900px, 100% - 3rem);
}
body[data-view="chat"] .chat {
  flex: 1;
  margin: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  /* override 默认 mode=primary 设置 */
}
body[data-view="chat"] .chat-window {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  padding-bottom: 1.5rem;
}
body[data-view="chat"] .messages {
  flex: 1;
  max-height: none !important;
  min-height: 0;
}

@media (max-width: 720px) {
  body[data-view="chat"] .container {
    padding-top: 1rem;
    padding-bottom: 1rem;
    max-width: 100%;
    padding-left: 1rem;
    padding-right: 1rem;
  }
  /* 移动端 chat 视图：隐藏 chat-head 右侧 "powered by"，
     让 top-controls (看经历 + theme) 浮在 chat-head 内右侧，
     与左侧 "聊聊吧" 标题垂直居中对齐 */
  body[data-view="chat"] .chat-model { display: none; }
  body[data-view="chat"] .chat-head {
    padding-top: 0.85rem;
    padding-bottom: 0.85rem;
    min-height: 56px;
  }
  body[data-view="chat"] .top-controls {
    top: 1.6rem;        /* container 1rem + chat-head padding ~0.6rem ≈ 与 h2 中线齐 */
    right: 1.5rem;
  }
}

body[data-view="resume"] .chat:not([data-mode="floating-half"]) {
  display: none !important;
}

/* =====================================================
   Hero
   ===================================================== */

.hero { margin-bottom: 4rem; }

.hero-top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 500;
  letter-spacing: -1px;
  line-height: 1;
  color: var(--text);
}

.hero-loc {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--text-3);
}

.tagline {
  margin: 0 0 1.5rem;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 24px;
  line-height: 1.4;
  color: var(--text);
  max-width: 32em;
}

.lead {
  margin: 0 0 1.75rem;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-2);
  max-width: 38em;
}

.contact-list {
  display: flex;
  gap: 1.75rem;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 12px;
}
.contact-list a {
  color: var(--accent);
  border-bottom: 0.5px solid color-mix(in srgb, var(--accent) 35%, transparent);
}
.contact-copy {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  background: transparent;
  border: none;
  border-bottom: 0.5px solid color-mix(in srgb, var(--accent) 35%, transparent);
  padding: 0 0 1px;
  cursor: pointer;
  line-height: inherit;
  transition: color 0.2s, border-color 0.2s;
  position: relative;
}
.contact-copy:hover {
  color: var(--accent-deep);
  border-bottom-color: var(--accent-deep);
}
.contact-copy.copied::after {
  content: '已复制';
  position: absolute;
  left: 50%;
  bottom: calc(100% + 6px);
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 3px 8px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  white-space: nowrap;
  animation: copyToastIn 0.2s ease;
}

/* =====================================================
   Stats strip
   ===================================================== */

.stats-strip {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3px;
  color: var(--text-3);
  min-height: 18px;
  transition: opacity 0.3s ease;
}
.stats-strip[data-state="loading"] { opacity: 0; }
.stats-strip[data-state="ready"] { opacity: 1; }

.stats-item {
  display: none;
}
.stats-item[data-visible="true"] { display: inline-flex; align-items: baseline; gap: 0.4em; }

.stats-item .stats-num {
  font-weight: 500;
  color: var(--text);
  font-feature-settings: 'tnum';
}
.stats-leads .stats-num { color: var(--accent); }

.stats-sep {
  color: var(--border-strong);
  display: none;
}
.stats-strip[data-state="ready"] .stats-sep { display: inline; }

@media (max-width: 540px) {
  .stats-strip { font-size: 10.5px; }
}

/* =====================================================
   Interest CTA（chat 5 轮后底部）
   ===================================================== */

.msg-interest-cta {
  align-self: stretch;
  margin: 0.5rem 0;
  padding: 0.75rem 1rem;
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 0.5px dashed var(--accent);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  animation: ctaSlide 0.4s cubic-bezier(0.2, 0.7, 0.3, 1);
}
@keyframes ctaSlide {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: none; }
}

.msg-interest-cta-text {
  flex: 1;
  min-width: 180px;
  margin: 0;
  font-size: 12.5px;
  color: var(--text);
  line-height: 1.5;
}
.msg-interest-cta-text strong {
  color: var(--accent-deep);
  font-weight: 500;
}

.msg-interest-cta-btn {
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 999px;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
}
.msg-interest-cta-btn:hover { background: var(--accent); }
.msg-interest-cta-btn:active { transform: scale(0.97); }
.msg-interest-cta-btn:disabled {
  background: var(--text-3);
  cursor: not-allowed;
}

/* contact CTA 内多按钮布局 */
.msg-contact-cta-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.msg-interest-cta-btn-outline {
  background: transparent;
  color: var(--text);
  border: 0.5px solid var(--border-strong);
}
.msg-interest-cta-btn-outline:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-deep);
}

.msg-contact-cta {
  /* 在 contact CTA 上特别突出渐变 */
  background: linear-gradient(135deg, var(--accent-soft), var(--green-soft));
}
@keyframes copyToastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(4px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* =====================================================
   Chat
   ===================================================== */

.chat {
  margin: 0 0 5rem;
  background: var(--bg-chat);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 1px 0 rgba(31, 30, 27, 0.03);
}

.chat-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem 0.9rem;
  border-bottom: 0.5px solid var(--border);
}

.chat-title {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.chat-title h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
}

.chat-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 3px var(--accent-soft); }
  50% { box-shadow: 0 0 0 6px var(--accent-soft); }
}

.chat-model {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-3);
  letter-spacing: 0.5px;
}

.chat-window {
  padding: 1.25rem 1.5rem 1.25rem;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 1.25rem;
  min-height: 80px;
  max-height: 500px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}
.messages::-webkit-scrollbar { width: 6px; }
.messages::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

.msg {
  max-width: 88%;
  padding: 0.7rem 1rem;
  border-radius: 10px;
  font-size: 14px;
  line-height: 1.7;
}
.msg p { margin: 0; }
.msg p + p { margin-top: 0.6rem; }

.msg-bot {
  background: var(--bg-msg-bot);
  border: 0.5px solid var(--border);
  color: var(--text);
  align-self: flex-start;
}

.msg-user {
  background: var(--bg-msg-user);
  color: var(--text-on-dark);
  align-self: flex-end;
  border: none;
}

.msg-bot strong { color: var(--accent); font-weight: 500; }
.msg-bot code {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--bg-deep);
  padding: 1px 5px;
  border-radius: 3px;
}

.msg.typing::after {
  content: '·';
  display: inline-block;
  animation: typing 1.2s steps(4, end) infinite;
  color: var(--text-3);
  margin-left: 2px;
}
@keyframes typing {
  0% { content: '·'; }
  25% { content: '· ·'; }
  50% { content: '· · ·'; }
  75% { content: '· ·'; }
  100% { content: '·'; }
}

.starters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 0.85rem;
}

.starter {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text-2);
  background: var(--bg);
  border: 0.5px solid var(--border);
  border-radius: 999px;
  padding: 5px 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.starter:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.starter:active { transform: scale(0.97); }

.quick-replies {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 0.6rem;
}
.quick-replies:empty { display: none; }

.quick-reply-btn {
  font-family: var(--font-sans);
  font-size: 12px;
  color: var(--text);
  background: var(--bg);
  border: 0.5px solid var(--border-strong);
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  transition: all 0.18s ease;
  animation: quickReplyIn 0.25s cubic-bezier(0.2, 0.7, 0.3, 1) backwards;
}
.quick-reply-btn:nth-child(2) { animation-delay: 0.04s; }
.quick-reply-btn:nth-child(3) { animation-delay: 0.08s; }
.quick-reply-btn:nth-child(4) { animation-delay: 0.12s; }
.quick-reply-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
}
.quick-reply-btn:active { transform: scale(0.97); }

@keyframes quickReplyIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

.composer {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 0.5px solid var(--border-strong);
  border-radius: 10px;
  padding: 4px 4px 4px 14px;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.composer:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.composer input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--font-sans);
  font-size: 14px;
  color: var(--text);
  padding: 8px 0;
}
.composer input::placeholder { color: var(--text-3); }

.composer button {
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.2s ease;
}
.composer button:hover { background: var(--accent); }
.composer button:disabled {
  background: var(--text-3);
  cursor: not-allowed;
}

.chat-note {
  margin-top: 0.85rem;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-3);
  letter-spacing: 0.3px;
}

/* =====================================================
   Section heading
   ===================================================== */

.section-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}
.section-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 4px;
  text-transform: uppercase;
  color: var(--text);
}
.rule {
  width: 24px;
  height: 1px;
  background: var(--text);
}
.rule-flex { flex: 1; background: var(--border); }
.meta-mono {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.5px;
}

/* =====================================================
   Timeline
   ===================================================== */

.journey { margin-bottom: 5rem; }

.timeline {
  position: relative;
  padding-left: 2.75rem;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0.6rem;
  bottom: 0.6rem;
  width: 1px;
  background: var(--border-strong);
}

.step {
  position: relative;
  margin-bottom: 2.75rem;
}
.step:last-child { margin-bottom: 0; }

.step-dot {
  position: absolute;
  left: -2.75rem;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  background: var(--text);
  border-radius: 50%;
  box-shadow: 0 0 0 5px var(--bg);
}

.step-now .step-dot {
  width: 14px; height: 14px;
  background: var(--accent);
  box-shadow: 0 0 0 5px var(--bg), 0 0 0 6px var(--accent-soft);
}

.step-meta {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.step-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 1px;
}

.step-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-2);
  background: var(--bg-deep);
  padding: 2px 8px;
  border-radius: 3px;
  letter-spacing: 0.5px;
}
.tag-accent {
  color: var(--green);
  background: var(--green-soft);
}

.step h3 {
  margin: 0 0 2px;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.2;
}

.step-role {
  margin: 0 0 10px;
  font-size: 13px;
  color: var(--text-2);
  font-style: italic;
}

.step-body {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
  max-width: 34em;
}

.pill-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.pill {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-2);
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  padding: 3px 8px;
  border-radius: 3px;
}

.step-link {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  border: none;
  padding: 0;
  letter-spacing: 0.3px;
}
.step-link:hover { color: var(--accent-deep); }

/* =====================================================
   Project deep-dive
   ===================================================== */

.project {
  margin-bottom: 5rem;
  padding-top: 1.5rem;
  border-top: 0.5px solid var(--border);
  scroll-margin-top: 2rem;
}

.proj-head {
  display: flex;
  align-items: baseline;
  gap: 1.25rem;
  margin-bottom: 1.75rem;
}

.proj-num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: 1px;
}

.proj-head h2 {
  margin: 0 0 2px;
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.4px;
  line-height: 1.15;
  color: var(--text);
}

.proj-sub {
  margin: 0;
  font-size: 13px;
  color: var(--text-2);
  font-style: italic;
}

.proj-grid {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 2.25rem;
  margin-bottom: 2.5rem;
}

.proj-body p {
  margin: 0 0 1rem;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}
.proj-body p:last-child { margin-bottom: 0; }

.proj-side {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.side-stat {
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}

.stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-3);
  letter-spacing: 1px;
  margin-bottom: 4px;
}

.stat-value {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--text);
  line-height: 1.1;
  margin-bottom: 2px;
}

.stat-note {
  display: block;
  font-size: 11px;
  color: var(--text-2);
  line-height: 1.4;
}

.stat-big {
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: wrap;
}

.stat-before {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-3);
  text-decoration: line-through;
  text-decoration-color: var(--text-3);
}

.stat-arrow {
  font-family: var(--font-mono);
  color: var(--text-3);
  font-size: 13px;
}

.stat-after {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.stat-after-only {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 500;
  color: var(--green);
}

.stat-cap {
  flex-basis: 100%;
  font-size: 11px;
  color: var(--text-2);
  margin-top: 2px;
}

.stat-extra .stat-after-only { color: var(--green); }

.diagram-title {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: 14px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 2px;
  text-transform: uppercase;
}

.diagram-cap {
  margin: 0 0 1.25rem;
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 40em;
}

.diagram-wrap {
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  margin-bottom: 2.5rem;
  overflow: hidden;
}

.diagram-wrap svg { display: block; width: 100%; height: auto; }

/* Capability grid */
.cap-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.85rem;
}

.cap {
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}

.cap-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 3px;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.cap h4 {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
}

.cap p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-2);
}

/* =====================================================
   Tech Stack
   ===================================================== */

.techstack { margin-bottom: 5rem; }

.stack-cap {
  margin: 0 0 1.5rem;
  font-size: 13px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 40em;
}

#diag-stack {
  min-height: 480px;
  position: relative;
}

#diag-stack .stack-tooltip {
  position: absolute;
  background: var(--text);
  color: var(--bg);
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s;
  max-width: 220px;
  line-height: 1.5;
  z-index: 5;
}

/* =====================================================
   Footer
   ===================================================== */

.footer {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 0.5px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer p { margin: 0; }

.footer-name {
  font-family: var(--font-serif);
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}

.footer-mail {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  margin-top: 4px;
  letter-spacing: 0.3px;
}

.footer-right { text-align: right; }

.footer-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  letter-spacing: 0.5px;
}

.footer-year {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  margin-top: 4px;
}

/* =====================================================
   Responsive
   ===================================================== */

@media (max-width: 720px) {
  :root { --pad-x: 1.5rem; }

  .container { padding-top: 3rem; }

  .hero h1 { font-size: 36px; }
  .tagline { font-size: 19px; }

  .proj-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .proj-head h2 { font-size: 24px; }

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

  .timeline { padding-left: 2rem; }
  .step-dot { left: -2rem; }

  .diagram-wrap { padding: 1rem; }

  .footer {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-right { text-align: left; }

  .messages { max-height: 360px; }
}

/* =====================================================
   Diagram SVG common
   ===================================================== */

.node-rect {
  fill: var(--bg);
  stroke: var(--border-strong);
  stroke-width: 0.5;
  transition: stroke 0.2s, fill 0.2s;
}
.node-rect.accent {
  fill: var(--accent-soft);
  stroke: var(--accent);
}
.node-rect.green {
  fill: var(--green-soft);
  stroke: var(--green);
}

.node-label {
  font-family: var(--font-sans);
  font-size: 12px;
  fill: var(--text);
  text-anchor: middle;
  dominant-baseline: central;
}
.node-sub {
  font-family: var(--font-mono);
  font-size: 9px;
  fill: var(--text-3);
  text-anchor: middle;
  letter-spacing: 0.5px;
}

.edge {
  fill: none;
  stroke: var(--border-strong);
  stroke-width: 1;
}
.edge-accent { stroke: var(--accent); stroke-width: 1.2; }

.flow-dot { fill: var(--accent); }

/* animation on first scroll into view */
@media (prefers-reduced-motion: no-preference) {
  .hero, .step, .project, .techstack {
    animation: fadeUp 0.6s cubic-bezier(0.2, 0.7, 0.3, 1) backwards;
  }
  .journey { animation-delay: 0.16s; }
}
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* =====================================================
   Chooser overlay（首屏）
   ===================================================== */

.chooser {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  animation: chooserFadeIn 0.3s ease;
}
.chooser[data-visible="false"] {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s ease;
}

@keyframes chooserFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.chooser-card {
  background: var(--bg-elev);
  border: 0.5px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem 2.25rem 1.75rem;
  max-width: 480px;
  width: 100%;
  box-shadow: 0 24px 60px rgba(31, 30, 27, 0.10), 0 2px 6px rgba(31, 30, 27, 0.05);
  text-align: center;
}

.chooser-eyebrow {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2.5px;
  color: var(--text-3);
}

.chooser-card h2 {
  margin: 0 0 0.5rem;
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.4px;
}

.chooser-sub {
  margin: 0 0 1.75rem;
  font-size: 13px;
  color: var(--text-2);
}

.chooser-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.chooser-btn {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 1rem 1.1rem 1rem 1.1rem;
  background: var(--bg);
  border: 0.5px solid var(--border-strong);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-sans);
  cursor: pointer;
  transition: border-color 0.2s, transform 0.15s, background 0.2s;
  text-align: left;
  overflow: hidden;
}

.chooser-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}
.chooser-btn:active { transform: translateY(0); }

.chooser-btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.chooser-btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #FAF8F2;
}

.chooser-btn-label {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0;
}

.chooser-btn-hint {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  opacity: 0.7;
}

.chooser-ring {
  position: absolute;
  top: 50%;
  right: 12px;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  opacity: 0;
  transition: opacity 0.2s;
}
.chooser-btn-primary[data-counting="true"] .chooser-ring {
  opacity: 1;
}

.chooser-ring-track {
  fill: none;
  stroke: currentColor;
  stroke-opacity: 0.25;
  stroke-width: 2;
}

.chooser-ring-fill {
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: 22px 22px;
  /* perimeter = 2 * pi * 19 ≈ 119.4 */
  stroke-dasharray: 119.4;
  stroke-dashoffset: 119.4;
}
.chooser-btn-primary[data-counting="true"] .chooser-ring-fill {
  animation: chooserRing 3s linear forwards;
}
@keyframes chooserRing {
  to { stroke-dashoffset: 0; }
}

.chooser-skip {
  display: inline-block;
  margin: 0;
  padding: 6px 10px;
  background: transparent;
  border: none;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-3);
  cursor: pointer;
  letter-spacing: 0.3px;
}
.chooser-skip:hover { color: var(--accent); }

@media (max-width: 480px) {
  .chooser-card { padding: 2rem 1.5rem 1.25rem; }
  .chooser-actions { grid-template-columns: 1fr; }
  .chooser-card h2 { font-size: 22px; }
}

/* =====================================================
   Chat · 双模式（hidden / floating / primary）
   ===================================================== */

/* 通用：chat-head 右侧布局 */
.chat-head-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.chat-close,
.chat-clear {
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  border-radius: 50%;
  transition: color 0.2s, background 0.2s;
}
.chat-close:hover,
.chat-clear:hover {
  color: var(--accent);
  background: var(--accent-soft);
}
/* chat-close 只在 floating-half 显示；clear 在所有 chat 可见时都显示 */
.chat-close { display: none; }

/* default initial state: hidden */
.chat[data-mode="hidden"] {
  display: none;
}

/* primary mode: 占主屏顶部，正常文档流 */
.chat[data-mode="primary"] {
  margin: 0 0 4rem;
  display: block;
}
.chat[data-mode="primary"] .messages {
  max-height: min(60vh, 560px);
  min-height: 280px;
}

/* half-screen 浮窗：trigger CTA 触发，屏幕底部 slide up，占视口 50% */
.chat[data-mode="floating-half"] {
  position: fixed;
  left: 50%;
  bottom: 0;
  transform: translateX(-50%);
  z-index: 95;
  margin: 0;
  width: min(720px, calc(100vw - 2rem));
  height: 55vh;
  min-height: 360px;
  display: flex;
  flex-direction: column;
  border-radius: 16px 16px 0 0;
  box-shadow: 0 -22px 60px rgba(31, 30, 27, 0.20), 0 -2px 6px rgba(31, 30, 27, 0.06);
  border: 0.5px solid var(--border-strong);
  border-bottom: none;
  animation: chatHalfSlideUp 0.32s cubic-bezier(0.2, 0.7, 0.3, 1);
}

@keyframes chatHalfSlideUp {
  from { transform: translate(-50%, 100%); }
  to { transform: translate(-50%, 0); }
}

.chat[data-mode="floating-half"] .chat-close { display: flex; }
.chat[data-mode="floating-half"] .chat-window {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 1rem 1.25rem 1rem;
}
.chat[data-mode="floating-half"] .messages {
  flex: 1;
  max-height: none;
  min-height: 0;
  /* 滚动到顶/底后不向 body 传播，避免背景简历跟着滚 */
  overscroll-behavior: contain;
}
.chat[data-mode="floating-half"] {
  overscroll-behavior: contain;
}
.chat[data-mode="floating-half"] .starters { display: none; }

@media (max-width: 540px) {
  .chat[data-mode="floating-half"] {
    left: 0;
    right: 0;
    transform: none;
    width: 100%;
    max-width: 100%;
    height: 60vh;
    border-radius: 14px 14px 0 0;
  }
  @keyframes chatHalfSlideUp {
    from { transform: translateY(100%); }
    to { transform: none; }
  }
}

/* =====================================================
   Chat FAB（看简历模式 / chat 收起时显示）
   ===================================================== */

.chat-fab {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 90;
  width: 52px;
  height: 52px;
  display: none;
  align-items: center;
  justify-content: center;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 12px 28px rgba(31, 30, 27, 0.20), 0 2px 6px rgba(31, 30, 27, 0.10);
  transition: transform 0.18s ease, background 0.2s;
  animation: fabIn 0.32s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.chat-fab[data-visible="true"] { display: flex; }
.chat-fab:hover {
  background: var(--accent);
  transform: translateY(-2px);
}
.chat-fab:active { transform: translateY(0); }

@keyframes fabIn {
  from { opacity: 0; transform: scale(0.7) translateY(8px); }
  to { opacity: 1; transform: none; }
}

.chat-fab-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--accent);
  color: #FAF8F2;
  border-radius: 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  display: none;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--bg);
  letter-spacing: 0;
}
.chat-fab-badge[data-visible="true"] { display: flex; }

/* =====================================================
   Trigger bubble（dwell / click / selection 触发）
   ===================================================== */

.trigger-bubble {
  position: fixed;
  right: 1.25rem;
  bottom: calc(1.25rem + 52px + 12px);
  z-index: 92;
  max-width: 320px;
  background: var(--bg-elev);
  border: 0.5px solid var(--border-strong);
  border-radius: 12px;
  padding: 0.9rem 1rem 0.85rem;
  box-shadow: 0 14px 30px rgba(31, 30, 27, 0.14), 0 2px 6px rgba(31, 30, 27, 0.08);
  display: none;
  flex-direction: column;
  gap: 0.6rem;
  animation: bubbleIn 0.3s cubic-bezier(0.2, 0.7, 0.3, 1);
}
.trigger-bubble[data-visible="true"] { display: flex; }

@keyframes bubbleIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

.trigger-bubble::after {
  /* small arrow pointing down toward FAB */
  content: '';
  position: absolute;
  right: 18px;
  bottom: -6px;
  width: 10px;
  height: 10px;
  background: var(--bg-elev);
  border-right: 0.5px solid var(--border-strong);
  border-bottom: 0.5px solid var(--border-strong);
  transform: rotate(45deg);
}

.trigger-bubble-close {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  border-radius: 50%;
  transition: color 0.2s, background 0.2s;
}
.trigger-bubble-close:hover {
  color: var(--accent);
  background: var(--accent-soft);
}

.trigger-bubble-text {
  margin: 0;
  padding-right: 20px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text);
}

.trigger-bubble-cta {
  align-self: flex-start;
  background: var(--text);
  color: var(--bg);
  border: none;
  border-radius: 999px;
  padding: 4px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}
.trigger-bubble-cta:hover { background: var(--accent); }
.trigger-bubble-cta:active { transform: scale(0.97); }

@media (max-width: 540px) {
  .trigger-bubble {
    left: 0.75rem;
    right: 0.75rem;
    max-width: none;
  }
}