/* ==========================================================================
   Tianyi Ma — academic homepage
   Minimal, bilingual (EN/中文), light/dark aware.
   ========================================================================== */

/* --------------------------------------------------------------------------
   Webfonts — self-hosted (assets/fonts/*.woff2), no third-party requests.
   Latin + Latin-Ext subsets only; CJK falls back to the system stack below.
   -------------------------------------------------------------------------- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/inter-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/inter-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/inter-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'JetBrains Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/jetbrains-mono-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/source-serif-4-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/source-serif-4-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/source-serif-4-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('assets/fonts/source-serif-4-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('assets/fonts/source-serif-4-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('assets/fonts/source-serif-4-latin-ext.woff2') format('woff2');
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C4, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

:root {
  --bg: #fbfaf7;
  --bg-elev: #ffffff;
  --text: #1b1b1a;
  --muted: #6d6c68;
  --border: #e8e6df;
  --accent: #0a7c5f;
  --accent-soft: rgba(10, 124, 95, 0.08);

  --serif: 'Source Serif 4', 'Songti SC', Georgia, serif;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

[data-theme='dark'] {
  --bg: #141412;
  --bg-elev: #1c1b18;
  --text: #e8e6e0;
  --muted: #9a978f;
  --border: #2a2925;
  --accent: #4ec49a;
  --accent-soft: rgba(78, 196, 154, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 64px;
}

/* --------------------------------------------------------------------------
   Language visibility
   -------------------------------------------------------------------------- */
html[data-lang='en'] .cn,
html[data-lang='en'] .lang-cn { display: none; }
html[data-lang='cn'] .en,
html[data-lang='cn'] .lang-en { display: none; }

/* --------------------------------------------------------------------------
   Header / toggles
   -------------------------------------------------------------------------- */
.site-header {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-bottom: 24px;
}

.toggle {
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.toggle:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.toggle-lang .sep {
  margin: 0 2px;
  opacity: 0.5;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 40px;
}

.hero-avatar {
  width: 80px;
  height: 80px;
  border-radius: 16px;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.hero-name {
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 600;
  margin: 0;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.hero-name .aka {
  font-style: normal;
  font-size: 1.1rem;
  font-weight: 400;
  color: var(--muted);
  margin-left: 10px;
  letter-spacing: 0.02em;
}

.hero-tagline {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */
.section {
  margin-bottom: 48px;
}

.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}

.section p {
  margin: 0 0 12px;
}

.section a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.section a:hover {
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   Rows (education, etc.)
   -------------------------------------------------------------------------- */
.rows {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.row {
  display: flex;
  gap: 16px;
}

.row-year {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  min-width: 84px;
  flex-shrink: 0;
  padding-top: 2px;
}

.row-title {
  font-weight: 600;
}

.row-meta {
  color: var(--muted);
  font-size: 0.9rem;
}

/* --------------------------------------------------------------------------
   Publications
   -------------------------------------------------------------------------- */
.pubs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.pub {
  display: flex;
  gap: 16px;
}

.pub-year {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  min-width: 40px;
  flex-shrink: 0;
  padding-top: 4px;
}

.pub-body {
  flex: 1;
}

.pub-title {
  font-family: var(--serif);
  font-size: 1.08rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 4px;
}

.pub-authors {
  font-size: 0.9rem;
  color: var(--muted);
}

.pub-authors strong {
  color: var(--text);
  font-weight: 600;
}

.pub-venue {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  margin-top: 4px;
}

.pub-links {
  margin-top: 6px;
  font-size: 0.85rem;
  display: flex;
  gap: 14px;
}

.pub-links a {
  font-family: var(--mono);
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.pub-links a:hover {
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */
.contact-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.contact-links li {
  display: flex;
  gap: 16px;
  align-items: baseline;
}

.contact-links .label {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 72px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.82rem;
}

.site-footer a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.site-footer a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* --------------------------------------------------------------------------
   Reveal on scroll
   -------------------------------------------------------------------------- */
.js .reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.js .reveal.revealed {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --------------------------------------------------------------------------
   Small screens
   -------------------------------------------------------------------------- */
@media (max-width: 520px) {
  .hero {
    flex-direction: column;
    align-items: flex-start;
  }

  .row,
  .pub {
    flex-direction: column;
    gap: 4px;
  }

  .row-year,
  .pub-year {
    min-width: 0;
  }
}