:root {
  color-scheme: dark;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "Cascadia Mono", "Segoe UI Mono", "SFMono-Regular",
    Menlo, Monaco, Consolas, monospace;
  --space-0: #06070a;
  --space-1: #0b0e14;
  --space-2: #121722;
  --space-3: #1a2130;
  --fog: #e8ecf4;
  --mist: #9aa3b8;
  --dim: #5c6578;
  --line: rgba(232, 236, 244, 0.1);
  --line-strong: rgba(232, 236, 244, 0.18);
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.12);
  --signal: #4dabf7;
  --panel: rgba(18, 23, 34, 0.65);
  --shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

:root[data-theme="light"] {
  color-scheme: light;
  --space-0: #f4f5f8;
  --space-1: #e8eaf0;
  --space-2: #dce0ea;
  --space-3: #cfd5e2;
  --fog: #0d1117;
  --mist: #3d4456;
  --dim: #6b7280;
  --line: rgba(13, 17, 23, 0.1);
  --line-strong: rgba(13, 17, 23, 0.16);
  --accent: #2563eb;
  --accent-soft: rgba(37, 99, 235, 0.08);
  --signal: #0066b3;
  --panel: rgba(255, 255, 255, 0.82);
  --shadow: inset 0 1px 0 rgba(0, 0, 0, 0.06);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--space-0);
}

body {
  margin: 0;
  min-width: 320px;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--fog);
  background: var(--space-0);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  cursor: pointer;
}

.app {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
}

.app::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(77, 171, 247, 0.06), transparent 50%),
    radial-gradient(ellipse 80% 50% at 100% 50%, rgba(59, 130, 246, 0.05), transparent 45%),
    linear-gradient(180deg, var(--space-0) 0%, var(--space-1) 40%, var(--space-0) 100%);
}

.app::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.4;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-position: -1px -1px;
  background-size: 40px 40px;
  mask-image: linear-gradient(#000 0% 75%, transparent 100%);
}

:root[data-theme="light"] .app::after {
  opacity: 0.55;
}

.masthead {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 0.875rem clamp(1rem, 4vw, 2rem);
  border-bottom: 1px solid var(--line);
  background: color-mix(in oklab, var(--space-1) 88%, transparent);
  backdrop-filter: blur(12px);
}

.masthead__brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  color: inherit;
}

.masthead__mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  border: 1px solid var(--line-strong);
  background: var(--accent-soft);
  border-radius: 2px;
}

.masthead__brand strong {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.masthead__brand small {
  display: block;
  margin-top: 0.125rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.masthead__nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.25rem;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  border-radius: 2px;
}

.masthead__nav a {
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mist);
  border-radius: 2px;
  transition: color 0.15s, background 0.15s;
}

.masthead__nav a:hover {
  color: var(--fog);
  background: rgba(232, 236, 244, 0.06);
}

.masthead__nav a.is-active {
  color: var(--space-0);
  background: var(--fog);
}

:root[data-theme="light"] .masthead__nav a.is-active {
  color: var(--fog);
  background: var(--space-3);
}

.masthead__actions {
  display: flex;
  gap: 0.5rem;
}

.masthead__actions button {
  padding: 0.45rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  border-radius: 2px;
  transition: border-color 0.15s, color 0.15s;
}

.masthead__actions button:hover {
  color: var(--fog);
  border-color: var(--line-strong);
}

.main {
  position: relative;
  z-index: 1;
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2rem) 5rem;
}

.page-transition {
  animation: pageEnter 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes pageEnter {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-transition {
    animation: none;
  }
}

.section {
  padding: 3.5rem 0;
  border-top: 1px solid var(--line);
}

.section:first-of-type {
  padding-top: 2.5rem;
  border-top: none;
}

.section__head {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: 1rem 1.5rem;
  max-width: 48rem;
  margin-bottom: 2rem;
}

.section__id {
  padding-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.section__title {
  margin: 0;
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.03em;
  color: var(--fog);
}

.section__lede {
  grid-column: 2;
  max-width: 42rem;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--mist);
}

.hero {
  display: grid;
  grid-template-columns: 1fr minmax(16rem, 22rem);
  align-items: start;
  gap: 2.5rem 3rem;
  padding-bottom: 1rem;
}

.hero__kicker {
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: clamp(0.8125rem, 1.35vw, 0.9375rem);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--signal);
}

.hero__title {
  margin: 0 0 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.04em;
  color: var(--fog);
}

.hero__role {
  margin: 0 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.hero__text {
  max-width: 38rem;
  margin: 0 0 1rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--mist);
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1.25rem 0 1.5rem;
}

.hero__tags span {
  padding: 0.35rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.04em;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(232, 236, 244, 0.03);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.hero__contacts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.hero__contacts a,
.hero__contacts span {
  padding: 0.35rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: 2px;
}

.hero__contacts a:hover {
  color: var(--fog);
  border-color: var(--line-strong);
}

.hero__aside {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.portrait {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: var(--space-2);
  box-shadow: var(--shadow);
}

.portrait__placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 1;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: linear-gradient(145deg, var(--space-2), var(--space-3));
}

.portrait__meta {
  padding: 1rem 1.1rem;
  border-top: 1px solid var(--line);
}

.portrait__meta p {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--mist);
}

.portrait__meta h2 {
  margin: 0.35rem 0 0;
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.stat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.65rem;
}

.stat {
  padding: 1rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.stat strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--fog);
}

.stat span {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fog);
  border: 1px solid var(--line-strong);
  border-radius: 2px;
  background: transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.btn:hover {
  border-color: var(--fog);
  background: rgba(232, 236, 244, 0.06);
}

.btn--primary {
  color: var(--space-0);
  border-color: var(--accent);
  background: var(--accent);
}

:root[data-theme="light"] .btn--primary {
  color: #fff;
}

.btn--primary:hover {
  filter: brightness(1.08);
}

.card-grid {
  display: grid;
  gap: 1rem;
}

.card {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: var(--shadow);
  transition: border-color 0.15s;
}

.card:hover {
  border-color: var(--line-strong);
}

.card h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.card .meta {
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--dim);
}

.card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--mist);
}

.card .tech {
  margin: 0.5rem 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--signal);
}

.timeline {
  display: grid;
  gap: 1.25rem;
}

.timeline__item {
  padding-left: 1.25rem;
  border-left: 2px solid var(--line-strong);
}

.timeline__item h3 {
  margin: 0 0 0.25rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.timeline__item .date {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--dim);
}

.timeline__item ul {
  margin: 0;
  padding-left: 1.1rem;
}

.timeline__item li {
  margin-bottom: 0.45rem;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--mist);
}

.award-card {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.award-card.featured {
  border-color: color-mix(in oklab, var(--accent) 45%, var(--line));
  background: color-mix(in oklab, var(--accent-soft) 60%, var(--panel));
}

.award-card h3 {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.award-card .result {
  margin: 0 0 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.award-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--mist);
}

/* Resume builder */
.resume-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
  gap: 2rem;
  align-items: start;
}

.resume-panel {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.resume-panel h2 {
  margin: 0 0 1rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
}

.resume-panel label {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
  font-size: 0.82rem;
  line-height: 1.4;
  color: var(--mist);
  cursor: pointer;
}

.resume-panel input[type="checkbox"] {
  margin-top: 0.2rem;
  accent-color: var(--accent);
}

.resume-panel select {
  width: 100%;
  margin-bottom: 1rem;
  padding: 0.55rem 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fog);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--space-2);
}

.module-group {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--line);
}

.module-group:last-child {
  border-bottom: none;
}

.module-group h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
}

.resume-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

/* PDF preview document */
.pdf-doc {
  padding: 2rem 2.25rem;
  color: #1e1e1e;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 2px;
}

.pdf-doc header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid #dce3eb;
}

.pdf-doc h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
  color: #1e3a5f;
}

.pdf-doc .pdf-contact {
  font-size: 0.88rem;
  line-height: 1.55;
  color: #4a5b6e;
}

.pdf-doc h2 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.15rem;
  color: #0a3143;
  border-bottom: 1px solid #dce3eb;
  padding-bottom: 0.25rem;
}

.pdf-doc h3 {
  margin: 1rem 0 0.25rem;
  font-size: 0.98rem;
  color: #0a2a3b;
}

.pdf-doc .pdf-date {
  font-size: 0.82rem;
  color: #6b7280;
}

.pdf-doc ul {
  margin: 0.35rem 0 0;
  padding-left: 1.2rem;
}

.pdf-doc li {
  margin-bottom: 0.35rem;
  font-size: 0.88rem;
  line-height: 1.55;
}

.pdf-doc .pdf-tech {
  font-size: 0.82rem;
  color: #2563eb;
}

.pdf-doc a {
  color: #2e5a7f;
}

.paper-list {
  display: grid;
  gap: 1rem;
}

.paper-card {
  padding: 1.25rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.paper-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dim);
}

.paper-card__level {
  color: var(--accent);
  font-weight: 600;
}

.paper-card__title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.paper-card__title a:hover {
  color: var(--signal);
}

.paper-card__authors {
  margin: 0 0 0.5rem;
  font-size: 0.88rem;
  color: var(--mist);
}

.paper-card__intro {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--mist);
}

.guide-banner {
  padding-top: 1.5rem;
}

.guide-banner__inner {
  padding: 1.25rem 1.35rem;
  border: 1px solid color-mix(in oklab, var(--accent) 35%, var(--line));
  border-radius: 2px;
  background: color-mix(in oklab, var(--accent-soft) 50%, var(--panel));
}

.guide-banner h2 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
  font-weight: 600;
}

.guide-steps {
  margin: 0 0 0.75rem;
  padding-left: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.guide-steps code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--fog);
}

.guide-note {
  margin: 0 0 1rem;
  font-size: 0.85rem;
  color: var(--dim);
}

.tag-custom {
  display: inline-block;
  margin-left: 0.35rem;
  padding: 0.1rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid color-mix(in oklab, var(--accent) 40%, var(--line));
  border-radius: 2px;
  vertical-align: middle;
}

.tag-custom-inline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  color: var(--accent);
}

.section__head--stack .section__lede {
  grid-column: 1 / -1;
}

.section__lede--narrow {
  max-width: 38rem;
}

.add-entry-section {
  border-top: 1px solid var(--line);
}

.add-entry-panel {
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: var(--shadow);
}

.add-entry-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.add-tab {
  padding: 0.4rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--mist);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
}

.add-tab.is-active,
.add-tab:hover {
  color: var(--fog);
  border-color: var(--line-strong);
  background: rgba(232, 236, 244, 0.06);
}

.add-entry-form {
  display: grid;
  gap: 0.75rem;
}

.add-field {
  display: grid;
  gap: 0.35rem;
}

.add-field span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--dim);
}

.add-field input,
.add-field textarea,
.add-entry-panel select {
  width: 100%;
  padding: 0.55rem 0.65rem;
  font-size: 0.85rem;
  color: var(--fog);
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--space-2);
}

.add-entry-options,
.preset-picks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}

.add-check {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  color: var(--mist);
  cursor: pointer;
}

.add-hint {
  margin: 0;
  font-size: 0.82rem;
  color: var(--mist);
}

.add-hint.ok {
  color: var(--signal);
}

.add-hint.err {
  color: #f87171;
}

@media (max-width: 900px) {
  .masthead {
    flex-wrap: wrap;
  }

  .masthead__nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

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

  .resume-layout {
    grid-template-columns: 1fr;
  }
}

@media print {
  .masthead,
  .resume-panel,
  .no-print {
    display: none !important;
  }

  .app::before,
  .app::after {
    display: none;
  }

  body,
  html {
    background: #fff;
    color: #000;
  }

  .main {
    max-width: none;
    padding: 0;
  }

  .pdf-doc {
    border: none;
    padding: 0;
  }
}