/*
Theme Name: Yao 2026
Theme URI: https://yaomengy.com
Author: Derrick Yao
Author URI: https://yaomengy.com
Description: Recruiter-facing personal site for Mengyan (Derrick) Yao. Typography, rules, and type-scale only.
Version: 1.0.0
Requires at least: 6.4
Tested up to: 6.8
Requires PHP: 8.0
License: GNU General Public License v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: yao-2026
*/

/* -------------------------------------------------------------------------- */
/* Tokens                                                                      */
/* -------------------------------------------------------------------------- */
:root {
  --bg: #0a0a0a;
  --text: #ece7dc;
  --muted: #8a8578;
  --hairline: #2a2a2a;
  --accent: #d6ff3a;
  --font-display: "Fraunces", "Iowan Old Style", Palatino, "Palatino Linotype", serif;
  --font-body: "IBM Plex Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --pad-x: clamp(1.15rem, 4.2vw, 4.75rem);
  --max: 78rem;
  --header-h: 3.25rem;
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--bg);
  overflow-x: clip;
  color-scheme: dark;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  background: var(--bg) !important;
  color: var(--text) !important;
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.65;
  letter-spacing: 0.005em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
}

body.admin-bar .site-header {
  top: 32px;
}

@media screen and (max-width: 782px) {
  body.admin-bar .site-header { top: 46px; }
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--text);
  text-decoration: none;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--accent);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

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

.skip-link {
  position: absolute;
  left: 0.75rem;
  top: -4rem;
  z-index: 10000;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.65rem 0.9rem;
}

.skip-link:focus {
  top: 0.75rem;
  color: var(--bg);
  outline: 2px solid var(--text);
}

.screen-reader-text {
  border: 0;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
  word-wrap: normal !important;
}

.screen-reader-text:focus {
  clip: auto;
  clip-path: none;
  height: auto;
  width: auto;
  margin: 0;
  left: 0.75rem;
  top: 0.75rem;
  padding: 0.65rem 0.9rem;
  background: var(--accent);
  color: var(--bg);
  z-index: 10000;
}

/* -------------------------------------------------------------------------- */
/* Header / nav                                                                */
/* -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: var(--bg);
  border-bottom: 1px solid var(--hairline);
}

.site-header-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.38em;
  text-transform: uppercase;
  color: var(--text);
  line-height: 1;
  padding: 0.9rem 0;
}

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

.nav-toggle {
  display: none;
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 0.55rem 0;
}

.site-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.65rem;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.9rem 0;
  display: inline-block;
  position: relative;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.55rem;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms var(--ease);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: var(--bg);
    border-bottom: 1px solid var(--hairline);
    padding: 0.35rem var(--pad-x) 1.1rem;
  }
  body.nav-open .site-nav { display: block; }
  .site-nav ul {
    flex-direction: column;
    gap: 0;
  }
  .site-nav a {
    display: block;
    padding: 0.7rem 0;
    font-size: 0.78rem;
  }
  .site-nav a::after { display: none; }
}

/* -------------------------------------------------------------------------- */
/* Layout                                                                      */
/* -------------------------------------------------------------------------- */
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.section {
  padding: clamp(4.25rem, 10vw, 8.5rem) 0;
  scroll-margin-top: 4.25rem;
}

.section-head {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.25rem;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
  align-items: baseline;
}

.label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
}

.section-head .label {
  grid-column: 1 / span 12;
}

.section-head .label::before {
  content: "";
  display: inline-block;
  width: 0.45rem;
  height: 0.45rem;
  background: var(--accent);
  margin-right: 0.7rem;
  vertical-align: 0.08em;
}

.rule {
  height: 1px;
  background: var(--hairline);
  border: 0;
  margin: 0;
}

/* -------------------------------------------------------------------------- */
/* Hero                                                                        */
/* -------------------------------------------------------------------------- */
.hero {
  padding: clamp(3.5rem, 9vw, 7.5rem) 0 clamp(4.5rem, 11vw, 9rem);
}

.hero-name {
  font-family: var(--font-display);
  font-weight: 300;
  font-style: normal;
  font-size: clamp(3.35rem, 11.4vw, 9.75rem);
  line-height: 0.88;
  letter-spacing: -0.045em;
  margin: 0 0 clamp(2rem, 5vw, 3.75rem);
  font-variation-settings: "opsz" 144, "SOFT" 30, "WONK" 1;
  max-width: 18ch;
}

.hero-name em {
  font-style: italic;
  font-weight: 300;
  letter-spacing: -0.04em;
}

.hero-line {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.45rem, 2.15vw + 0.85rem, 2.55rem);
  line-height: 1.28;
  letter-spacing: -0.02em;
  max-width: 22ch;
  margin: 0 0 1.75rem;
  font-variation-settings: "opsz" 72, "SOFT" 50, "WONK" 1;
}

.hero-support {
  max-width: 38rem;
  color: var(--muted);
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0 0 clamp(2.5rem, 5vw, 3.75rem);
}

.hero-meta {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.25rem;
  row-gap: 1.35rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--hairline);
}

.hero-meta dt {
  grid-column: 1 / span 3;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0;
  padding-top: 0.2rem;
}

.hero-meta dd {
  grid-column: 4 / span 9;
  margin: 0;
}

.hero-meta dd strong {
  display: block;
  font-weight: 500;
  color: var(--text);
}

.hero-meta dd span {
  display: block;
  color: var(--muted);
  font-size: 0.95rem;
}

@media (max-width: 640px) {
  .hero-meta dt,
  .hero-meta dd {
    grid-column: 1 / -1;
  }
  .hero-meta dt { margin-bottom: -0.85rem; }
}

/* -------------------------------------------------------------------------- */
/* Work cards                                                                  */
/* -------------------------------------------------------------------------- */
.work-list {
  display: flex;
  flex-direction: column;
}

.work-card {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.5rem;
  row-gap: 1.1rem;
  padding: clamp(2.1rem, 4.5vw, 3.6rem) 0;
  border-top: 1px solid var(--hairline);
  text-decoration: none;
  color: inherit;
}

.work-list > .work-card:last-child {
  border-bottom: 1px solid var(--hairline);
}

.work-index {
  grid-column: 1 / span 1;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  padding-top: 0.45rem;
}

.work-metric {
  grid-column: 2 / span 4;
  min-width: 0;
}

.work-copy {
  grid-column: 6 / span 7;
  min-width: 0;
}

.work-metric-value {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.6rem, 5.4vw, 4.85rem);
  line-height: 0.92;
  letter-spacing: -0.035em;
  color: var(--accent);
  margin: 0;
  font-variation-settings: "opsz" 96, "SOFT" 0, "WONK" 1;
  overflow-wrap: anywhere;
}

.work-metric-value.is-text {
  font-size: clamp(1.65rem, 3.2vw, 2.65rem);
  letter-spacing: -0.025em;
  line-height: 1.05;
  padding-top: 0.15rem;
}

.work-metric-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0.7rem 0 0;
}

.work-kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.45rem;
}

.work-title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.35rem, 2vw, 1.85rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0 0 0.85rem;
  font-variation-settings: "opsz" 36, "SOFT" 20, "WONK" 0;
}

.work-body {
  margin: 0;
  color: var(--muted);
  max-width: 42rem;
}

.work-body strong {
  color: var(--text);
  font-weight: 500;
}

@media (max-width: 860px) {
  .work-index { grid-column: 1 / span 2; }
  .work-metric { grid-column: 3 / span 10; }
  .work-copy { grid-column: 3 / span 10; }
}

@media (max-width: 560px) {
  .work-index,
  .work-metric,
  .work-copy { grid-column: 1 / -1; }
  .work-index { padding-top: 0; }
}

/* -------------------------------------------------------------------------- */
/* Experience / education                                                      */
/* -------------------------------------------------------------------------- */
.role {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.5rem;
  padding: 1.65rem 0;
  border-top: 1px solid var(--hairline);
}

.role-list > .role:last-child {
  border-bottom: 1px solid var(--hairline);
}

.role-when {
  grid-column: 1 / span 4;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0;
  padding-top: 0.3rem;
}

.role-main {
  grid-column: 5 / span 8;
  min-width: 0;
}

.role-title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.role-org {
  margin: 0.2rem 0 0.55rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.role-body {
  margin: 0;
  color: var(--muted);
  max-width: 40rem;
}

@media (max-width: 720px) {
  .role-when,
  .role-main { grid-column: 1 / -1; }
  .role-when { margin-bottom: 0.35rem; }
}

.edu-row {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.5rem;
  padding: 1.2rem 0;
  border-top: 1px solid var(--hairline);
}

.edu-list > .edu-row:last-child {
  border-bottom: 1px solid var(--hairline);
}

.edu-when {
  grid-column: 1 / span 3;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin: 0;
  padding-top: 0.15rem;
}

.edu-degree {
  grid-column: 4 / span 4;
  margin: 0;
  font-weight: 500;
}

.edu-school {
  grid-column: 8 / span 5;
  margin: 0;
  color: var(--muted);
}

@media (max-width: 800px) {
  .edu-when,
  .edu-degree,
  .edu-school { grid-column: 1 / -1; }
  .edu-when { margin-bottom: 0.15rem; }
}

/* -------------------------------------------------------------------------- */
/* Research (compact work)                                                     */
/* -------------------------------------------------------------------------- */
.research-note {
  max-width: 38rem;
  color: var(--muted);
  margin: -0.5rem 0 2rem;
}

/* -------------------------------------------------------------------------- */
/* Contact                                                                     */
/* -------------------------------------------------------------------------- */
.contact-mail {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 300;
  font-size: clamp(1.7rem, 4.2vw, 3.15rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
  display: inline-block;
  margin: 0.4rem 0 1.75rem;
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 0.15rem;
  overflow-wrap: anywhere;
}

.contact-mail:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.25rem;
  margin: 0 0 2.5rem;
  padding: 0;
  list-style: none;
}

.contact-links a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.contact-aside {
  color: var(--muted);
  max-width: 36rem;
  margin: 0;
}

/* -------------------------------------------------------------------------- */
/* Footer                                                                      */
/* -------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 2.25rem 0 2.75rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: 1.5rem;
  row-gap: 1.4rem;
}

.footer-links {
  grid-column: 1 / span 6;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.5rem;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.footer-links a:hover { color: var(--accent); }

.footer-note {
  grid-column: 1 / span 7;
  font-size: 0.88rem;
  color: var(--muted);
  margin: 0;
  max-width: 34rem;
}

.footer-loc {
  grid-column: 8 / span 5;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin: 0;
  text-align: right;
}

.footer-mark {
  grid-column: 1 / span 12;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--hairline);
  margin: 1.25rem 0 0;
}

@media (max-width: 720px) {
  .footer-links,
  .footer-note,
  .footer-loc {
    grid-column: 1 / -1;
    text-align: left;
  }
}

/* -------------------------------------------------------------------------- */
/* Inner documents (CV / academics / posts)                                    */
/* -------------------------------------------------------------------------- */
.doc {
  padding: clamp(3rem, 7vw, 5.5rem) 0 clamp(5rem, 10vw, 8rem);
}

.doc-header {
  margin-bottom: 2.25rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--hairline);
}

.doc-title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.2rem, 5vw, 3.75rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin: 0.45rem 0 0;
  font-variation-settings: "opsz" 72, "SOFT" 20, "WONK" 1;
}

.entry-content {
  max-width: 42rem;
  color: var(--text);
}

.entry-content > *:first-child { margin-top: 0; }

.entry-content h1,
.entry-content h2,
.entry-content h3,
.entry-content h4,
.entry-content .wp-block-heading {
  font-family: var(--font-display);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--text);
  margin: 2.25rem 0 0.75rem;
}

.entry-content h2 { font-size: 1.65rem; }
.entry-content h3 { font-size: 1.3rem; }
.entry-content h4 { font-size: 1.1rem; }

.entry-content p,
.entry-content li {
  color: var(--muted);
}

.entry-content p { margin: 0 0 1.05rem; }

.entry-content a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--hairline);
  text-underline-offset: 0.18em;
}

.entry-content a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.entry-content ul,
.entry-content ol {
  padding-left: 1.15rem;
  margin: 0 0 1.15rem;
}

.entry-content blockquote,
.entry-content .wp-block-quote {
  margin: 1.5rem 0;
  padding: 0 0 0 1.15rem;
  border-left: 1px solid var(--accent);
  background: none;
}

.entry-content blockquote p,
.entry-content .wp-block-quote p {
  color: var(--text);
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.15rem;
}

.entry-content pre,
.entry-content .wp-block-preformatted,
.entry-content code {
  font-family: var(--font-mono);
}

.entry-content pre,
.entry-content .wp-block-preformatted {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--text);
  padding: 1rem 1.1rem;
  font-size: 0.82rem;
  line-height: 1.55;
  margin: 0 0 1.15rem;
  max-width: 100%;
  overflow-x: auto;
}

.entry-content .wp-block-separator,
.entry-content hr {
  border: 0;
  border-top: 1px solid var(--hairline);
  background: none;
  width: 100%;
  max-width: none;
  margin: 2rem 0;
}

.entry-content .wp-block-columns {
  display: block;
}

.entry-content .wp-block-social-links {
  padding: 0;
  margin: 1.25rem 0;
  gap: 1rem;
  background: none;
}

.entry-content .wp-social-link {
  background: transparent !important;
}

.entry-content .wp-social-link a {
  color: var(--text) !important;
  text-decoration: none;
}

.entry-content .wp-social-link a:hover {
  color: var(--accent) !important;
}

.entry-content .wp-block-group,
.entry-content .wp-block-column {
  padding: 0;
  background: none;
}

.post-nav {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--hairline);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.posts-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.posts-list li {
  border-top: 1px solid var(--hairline);
  padding: 1.15rem 0;
}

.posts-list a {
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: -0.02em;
}

.posts-list time {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.empty {
  color: var(--muted);
}

/* WordPress chrome we do not want leaking through */
.wp-site-blocks,
.has-global-padding {
  padding: 0 !important;
}

body.home .wp-block-template-part,
body .wp-block-site-title {
  display: contents;
}


.entry-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
}

.entry-content th,
.entry-content td {
  border-bottom: 1px solid var(--hairline);
  padding: 0.55rem 0.85rem 0.55rem 0;
  text-align: left;
  vertical-align: top;
  color: var(--muted);
}

.entry-content th { color: var(--text); font-weight: 500; }

.entry-content figure { margin: 0 0 1.25rem; }
.entry-content figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

body.custom-background {
  background-color: var(--bg) !important;
  background-image: none !important;
}

.entry-content .has-background,
.entry-content .wp-block-group,
.entry-content .wp-block-columns,
.entry-content .wp-block-column {
  background: transparent !important;
  color: inherit;
  padding-left: 0;
  padding-right: 0;
}

.entry-content .has-text-color,
.entry-content .has-contrast-color,
.entry-content .has-base-color {
  color: var(--text) !important;
}

/* -------------------------------------------------------------------------- */
/* Print                                                                       */
/* -------------------------------------------------------------------------- */
@media print {
  :root { --bg: #fff; --text: #111; --muted: #444; --hairline: #ccc; --accent: #111; }
  .site-header, .nav-toggle, .skip-link { position: static; }
  .site-nav { display: none !important; }
  a { text-decoration: underline; }
}