/* ---------- tokens ---------- */
:root {
  --bg: #f2efe7;
  --bg2: #ece9df;
  --panel: #ffffff;
  --panel2: #faf8f1;
  --text: #181a1f;
  --muted: #61656e;
  --faint: #9a9ea6;
  --line: rgba(0, 0, 0, .13);
  --line2: rgba(0, 0, 0, .06);
  --accent: #dd4f18;
  --accent-2: #b13d10;
  --accent-soft: rgba(221, 79, 24, .10);
  --grid: rgba(0, 0, 0, .045);
}
:root[data-theme="dark"] {
  --bg: #0b0c0f;
  --bg2: #0f1116;
  --panel: #131620;
  --panel2: #191d29;
  --text: #eceae6;
  --muted: #8b909b;
  --faint: #5b616e;
  --line: rgba(255, 255, 255, .10);
  --line2: rgba(255, 255, 255, .05);
  --accent: #ff6a2c;
  --accent-2: #ffb27a;
  --accent-soft: rgba(255, 106, 44, .13);
  --grid: rgba(255, 255, 255, .035);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: 'Space Grotesk', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 30px 30px;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #fff; }

@keyframes blink { 0%, 48% { opacity: 1; } 49%, 100% { opacity: 0; } }
@keyframes logIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.mono, .stage-sub { font-family: 'JetBrains Mono', monospace; }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 24px;
  height: 54px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: 'JetBrains Mono', monospace;
  font-weight: 600;
  font-size: 14px;
}
.brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
}
.header-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
}
.online { display: flex; align-items: center; gap: 6px; }
.online-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #3fcf6b;
  box-shadow: 0 0 8px #3fcf6b;
}
.clock { color: var(--faint); }
.theme-toggle {
  cursor: pointer;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 6px 10px;
  transition: border-color .15s ease, color .15s ease;
}
.theme-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- hero ---------- */
.hero { max-width: 1240px; margin: 0 auto; padding: 30px 24px 8px; }
.flow-strip {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .10);
}
.flow-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 15px;
  border-bottom: 1px solid var(--line2);
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--faint);
}
.flow-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }
.tput { margin-left: auto; color: var(--muted); white-space: nowrap; }
.tput span { color: var(--accent); }
#dag { display: block; width: 100%; height: 190px; }

.hero-2 {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 34px;
  align-items: end;
  padding: 34px 2px 10px;
}
.status-line {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--accent);
  margin-bottom: 16px;
}
.hero-name {
  font-size: clamp(44px, 7vw, 92px);
  line-height: .92;
  font-weight: 600;
  letter-spacing: -.03em;
  margin: 0 0 18px;
}
.hero-sub {
  font-family: 'JetBrains Mono', monospace;
  font-size: 15px;
  color: var(--muted);
  margin-bottom: 22px;
}
.hero-sub .at { color: var(--accent); }
.hero-sub2 { color: var(--faint); }
.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 13px;
}
.btn-link {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 9px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.btn-link:hover { border-color: var(--accent); color: var(--accent); }
.btn-link .arrow { color: var(--accent); }
.btn-cta {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}
.btn-cta:hover { background: var(--accent); color: #fff; }

/* live console */
.console {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel2);
  overflow: hidden;
}
.console-bar {
  display: flex;
  gap: 6px;
  padding: 9px 12px;
  border-bottom: 1px solid var(--line2);
}
.tl { width: 9px; height: 9px; border-radius: 50%; }
.tl-r { background: #ef6f6f; }
.tl-y { background: #e6c07b; }
.tl-g { background: #5fd08a; }
.console-title {
  margin-left: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--faint);
}
.console-body {
  padding: 12px 14px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.8px;
  line-height: 1.75;
  height: 186px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.log-row {
  animation: logIn .3s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.log-row .t, .log-row .msg { color: var(--muted); }
.log-row .st { color: var(--accent); display: inline-block; width: 74px; margin-right: 6px; }
.log-row .ok { color: #3fb06a; }

/* ---------- stepper ---------- */
.stepper {
  position: sticky;
  top: 54px;
  z-index: 55;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-top: 1px solid var(--line2);
  border-bottom: 1px solid var(--line);
}
.stepper-wrap { max-width: 1240px; margin: 0 auto; padding: 0 24px; }
.stepper-inner {
  display: flex;
  align-items: stretch;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
}
.step {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 13px 10px;
  border-right: 1px solid var(--line2);
  white-space: nowrap;
  transition: background .15s ease;
}
.step:last-child { border-right: none; }
.step:hover { background: var(--accent-soft); }
.step .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--faint);
  flex: none;
  transition: background .15s ease, box-shadow .15s ease;
}
.step .lbl { color: var(--muted); transition: color .15s ease; }
.step .num { color: var(--faint); }
.step.active { background: var(--accent-soft); }
.step.active .dot { background: var(--accent); box-shadow: 0 0 8px var(--accent); }
.step.active .lbl, .step.active .num { color: var(--accent); }

/* ---------- sections ---------- */
.content { max-width: 1240px; margin: 0 auto; padding: 8px 24px 0; }
.stage { padding: 56px 0 8px; scroll-margin-top: 120px; }
.stage-contact { padding-bottom: 80px; }
.stage-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 24px;
}
.stage-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 34px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}
.stage-head h2 {
  font-size: clamp(28px, 3.6vw, 42px);
  font-weight: 600;
  letter-spacing: -.02em;
  margin: 0;
}
.stage-sub { font-size: 12px; color: var(--faint); margin-top: 4px; }
.rule { flex: 1; height: 1px; background: var(--line); align-self: center; margin-left: 8px; }

/* ---------- 01 experience ---------- */
.timeline { position: relative; padding-left: 26px; }
.spine {
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 22px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--line));
}
.records { display: flex; flex-direction: column; gap: 14px; }
.record { position: relative; }
.node {
  position: absolute;
  left: -26px;
  top: 26px;
  border-radius: 50%;
}
.node-live {
  width: 13px;
  height: 13px;
  background: var(--accent);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 3px var(--bg), 0 0 12px var(--accent);
}
.node-ring {
  width: 11px;
  height: 11px;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 3px var(--bg);
}
.node-muted { border-color: var(--muted); top: 24px; }
.rec-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 20px;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 20px;
}
.rec-current { position: relative; overflow: hidden; }
.rec-alt { background: var(--panel2); padding: 18px; }
.rec-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--muted);
}
.rec-date-now { color: var(--text); }
.rec-title { font-size: 18px; font-weight: 600; }
.rec-title-lg { font-size: 19px; }
.rec-title-sm { font-size: 16px; }
.rec-org {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  color: var(--accent);
  margin: 2px 0 10px;
}
.rec-org-lg { font-size: 13px; margin: 3px 0 10px; }
.rec-org-sm { font-size: 12px; margin: 2px 0 6px; }
.rec-body ul {
  margin: 0;
  padding-left: 17px;
  color: var(--text);
  opacity: .84;
  font-size: 14.5px;
  line-height: 1.58;
}
.rec-current .rec-body ul { padding-left: 18px; opacity: .86; font-size: 15px; line-height: 1.6; }
.rec-body strong { color: var(--text); }
.rec-body p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.55; }

/* ---------- feature cards (02 research / 03 projects) ---------- */
.feature-list { display: flex; flex-direction: column; gap: 16px; }
.feature-card {
  display: block;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  overflow: hidden;
  transition: border-color .15s ease;
}
.feature-card:hover { border-color: var(--accent); }
.feature { display: grid; }
.feature-research { grid-template-columns: 230px 1fr; }
.feature-project { grid-template-columns: 1.1fr 1fr; }
.feature-side {
  background: var(--panel2);
  border-right: 1px solid var(--line2);
  padding: 26px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.pill-published {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: #2f8f5b;
  background: rgba(47, 143, 91, .12);
  border: 1px solid rgba(47, 143, 91, .35);
  border-radius: 20px;
  padding: 4px 11px;
}
.pub-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--muted);
}
.pub-journal { color: var(--text); font-weight: 600; }
.pub-publisher { color: var(--faint); }
.pub-year { margin-top: 8px; }
.pub-doi {
  margin-top: auto;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--faint);
  word-break: break-all;
}
.feature-body { padding: 26px 28px; }
.paper-title {
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: -.01em;
  max-width: 34ch;
}
.paper-abstract {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.65;
  max-width: 60ch;
}
.paper-abstract p { margin: 14px 0 18px; }
.paper-abstract strong { color: var(--text); }
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--muted);
}
.tag {
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 4px 9px;
  white-space: nowrap;
}
.tag-accent {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--accent);
  border-color: var(--accent);
}
.tag-fill { transition: background .15s ease, color .15s ease; }
.tag-fill:hover { background: var(--accent); color: #fff; }

/* projects specifics */
.project-img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
}
.project-body { padding: 32px 30px; display: flex; flex-direction: column; }
.project-kicker {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--accent);
  margin-bottom: 12px;
}
.project-title {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  letter-spacing: -.01em;
  transition: color .15s ease;
}
.project-title:hover { color: var(--accent); }
.project-arrow { color: var(--accent); font-size: 19px; }
.project-desc {
  font-size: 15.5px;
  color: var(--muted);
  line-height: 1.65;
  max-width: 44ch;
}
.project-desc p { margin: 14px 0 20px; }
.tags-bottom { margin-top: auto; }

/* ---------- 04 stack ---------- */
.stack-band {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  overflow: hidden;
  font-family: 'JetBrains Mono', monospace;
  margin-bottom: 16px;
}
.stack-band-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 18px;
  border-bottom: 1px solid var(--line);
  color: var(--faint);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.stack-dot { width: 7px; height: 7px; border-radius: 2px; background: var(--accent); }
.stack-count { margin-left: auto; text-transform: none; letter-spacing: 0; opacity: .72; }
.stack-fields { display: grid; grid-template-columns: repeat(4, 1fr); }
.stack-field { padding: 18px; border-right: 1px solid var(--line2); }
.stack-field:last-child { border-right: none; }
.stack-field-name { color: var(--accent); font-size: 13.5px; font-weight: 500; margin-bottom: 12px; }
.stack-field-n { color: var(--faint); font-weight: 400; }
.chips { display: flex; flex-wrap: wrap; gap: 7px; }
.chip {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel2);
  color: var(--text);
}
.cred-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; align-items: stretch; }
.cred-card {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 18px;
}
.cred-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--faint);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 12px;
}
.edu-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
}
.edu-row + .edu-row { border-top: 1px solid var(--line2); margin-top: 10px; padding-top: 10px; }
.edu-title { font-weight: 600; }
.edu-school { font-size: 13px; color: var(--muted); }
.edu-years {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--faint);
  white-space: nowrap;
}
.cert-row { display: flex; align-items: baseline; gap: 9px; }
.cert-row + .cert-row { margin-top: 10px; }
.cert-row .check { color: var(--accent); font-family: 'JetBrains Mono', monospace; }
.award { display: flex; align-items: center; gap: 9px; margin-bottom: 9px; font-size: 14.5px; }
.award-last { margin-bottom: 0; }
.award .star { color: var(--accent); }

/* ---------- 05 contact ---------- */
.contact-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel);
  padding: 38px;
  overflow: hidden;
  position: relative;
}
.contact-blob {
  position: absolute;
  right: -40px;
  top: -40px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: var(--accent-soft);
}
.contact-card h3 {
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 600;
  letter-spacing: -.025em;
  margin: 0 0 16px;
  max-width: 16ch;
  position: relative;
}
.contact-card p {
  font-size: 16px;
  color: var(--muted);
  max-width: 48ch;
  line-height: 1.6;
  margin: 0 0 26px;
  position: relative;
}
.contact-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 14px;
  position: relative;
}
.btn-primary {
  padding: 13px 20px;
  border-radius: 9px;
  background: var(--accent);
  color: #fff;
  font-weight: 500;
  transition: opacity .15s ease;
}
.btn-primary:hover { opacity: .88; }
.btn-outline {
  padding: 13px 20px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--panel);
  transition: border-color .15s ease, color .15s ease;
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- blog ---------- */
.blog-list { display: flex; flex-direction: column; gap: 14px; }
.post-link {
  display: block;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  padding: 20px;
  transition: border-color .15s ease;
}
.post-link:hover { border-color: var(--accent); }
.post-meta {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--faint);
  margin-bottom: 6px;
}
.post-meta a:hover { color: var(--accent); }
.post-title { font-size: 20px; font-weight: 600; }
.post-desc { font-size: 14.5px; color: var(--muted); line-height: 1.6; margin-top: 6px; }
.post-empty { font-family: 'JetBrains Mono', monospace; font-size: 13px; color: var(--faint); }
.draft-badge { color: var(--accent); }
.post-h1 {
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 600;
  letter-spacing: -.025em;
  margin: 6px 0 24px;
}
.prose { max-width: 72ch; font-size: 16px; line-height: 1.65; }
.prose a { color: var(--accent); }
.prose h2, .prose h3 { letter-spacing: -.02em; margin: 1.6em 0 .5em; }
.prose code {
  font-family: 'JetBrains Mono', monospace;
  font-size: .88em;
  background: var(--panel2);
  border: 1px solid var(--line2);
  border-radius: 4px;
  padding: 1px 5px;
}
.prose pre {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
}
.prose pre code { background: none; border: none; padding: 0; font-size: 13px; }
.prose blockquote {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg2); }
.footer-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 22px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
  color: var(--faint);
}
.cursor { color: var(--accent); animation: blink 1s step-end infinite; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .hero-2 { grid-template-columns: 1fr; }
  .stack-fields { grid-template-columns: 1fr; }
  .stack-field { border-right: none; border-bottom: 1px solid var(--line2); }
  .stack-field:last-child { border-bottom: none; }
  .cred-row { grid-template-columns: 1fr; }
  .rec-card { grid-template-columns: 1fr; gap: 6px; }
  .feature-research, .feature-project { grid-template-columns: 1fr; }
  .feature-side { border-right: none; border-bottom: 1px solid var(--line2); }
  .stepper-inner { overflow-x: auto; }
}
@media (max-width: 560px) {
  .clock { display: none; }
  .header-right { gap: 10px; }
}