/* ==========================================================================
   Chong Chen - personal site
   Minimalist premium-editorial. Native CSS, dual theme, restrained motion.
   Type: Geist (sans) + Geist Mono (metadata). Accent: pine emerald.
   ========================================================================== */

/* ---- Fonts (self-hosted, variable) ------------------------------------- */
@font-face {
  font-family: "Geist";
  src: url("../fonts/geist-sans.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Geist Mono";
  src: url("../fonts/geist-mono.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ---- Tokens ------------------------------------------------------------- */
:root {
  --font-sans: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* light theme */
  --bg: #faf9f6;
  --bg-2: #ffffff;
  --bg-3: #f1efe9;
  --text: #1b1a17;
  --text-2: #585650;
  --text-3: #696760;
  --border: #e7e3da;
  --border-2: #d9d4c8;
  --accent: #0f6b4f;
  --accent-2: #0b573f;
  --accent-soft: rgba(15, 107, 79, 0.1);
  --accent-line: rgba(15, 107, 79, 0.28);
  --hl-bg: rgba(15, 107, 79, 0.12);
  --shadow-color: 38 34 24;
  --shadow-sm: 0 1px 2px rgba(var(--shadow-color) / 0.06);
  --shadow-md: 0 18px 40px -24px rgba(var(--shadow-color) / 0.35);
  --shadow-lg: 0 40px 80px -40px rgba(var(--shadow-color) / 0.45);

  --maxw: 1080px;
  --gutter: clamp(1.25rem, 5vw, 3.25rem);
  --section-y: clamp(4.5rem, 9vw, 8rem);
  --radius: 16px;
  --radius-sm: 8px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --reveal-dur: 0.7s;
}

[data-theme="dark"] {
  --bg: #0f0f10;
  --bg-2: #161618;
  --bg-3: #1d1d20;
  --text: #ededea;
  --text-2: #a4a19b;
  --text-3: #8c8982;
  --border: rgba(255, 255, 255, 0.1);
  --border-2: rgba(255, 255, 255, 0.16);
  --accent: #5bcb9d;
  --accent-2: #7ad8b3;
  --accent-soft: rgba(91, 203, 157, 0.13);
  --accent-line: rgba(91, 203, 157, 0.3);
  --hl-bg: rgba(91, 203, 157, 0.14);
  --shadow-color: 0 0 0;
  --shadow-sm: 0 1px 2px rgba(0 0 0 / 0.4);
  --shadow-md: 0 22px 48px -26px rgba(0 0 0 / 0.7);
  --shadow-lg: 0 44px 90px -44px rgba(0 0 0 / 0.8);
}

/* No-JS / no explicit choice: honor system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f0f10;
    --bg-2: #161618;
    --bg-3: #1d1d20;
    --text: #ededea;
    --text-2: #a4a19b;
    --text-3: #8c8982;
    --border: rgba(255, 255, 255, 0.1);
    --border-2: rgba(255, 255, 255, 0.16);
    --accent: #5bcb9d;
    --accent-2: #7ad8b3;
    --accent-soft: rgba(91, 203, 157, 0.13);
    --accent-line: rgba(91, 203, 157, 0.3);
  --hl-bg: rgba(91, 203, 157, 0.14);
    --shadow-color: 0 0 0;
    --shadow-sm: 0 1px 2px rgba(0 0 0 / 0.4);
    --shadow-md: 0 22px 48px -26px rgba(0 0 0 / 0.7);
    --shadow-lg: 0 44px 90px -44px rgba(0 0 0 / 0.8);
  }
}

/* ---- Reset / base ------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}
* {
  margin: 0;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  font-feature-settings: "cv01", "ss03";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}
::selection {
  background: var(--accent-soft);
  color: var(--text);
}

.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  top: 0.5rem;
  left: 0.5rem;
  z-index: 200;
  padding: 0.6rem 1rem;
  background: var(--text);
  color: var(--bg);
  border-radius: var(--radius-sm);
  transform: translateY(-150%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus {
  transform: translateY(0);
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---- Icons -------------------------------------------------------------- */
.icon {
  width: 20px;
  height: 20px;
  display: inline-block;
  vertical-align: middle;
  flex: none;
}
.icon-xs {
  width: 13px;
  height: 13px;
}

/* ---- Theme transition (applied briefly on toggle) ---------------------- */
.theming,
.theming *,
.theming *::before,
.theming *::after {
  transition: background-color 0.45s var(--ease), color 0.45s var(--ease),
    border-color 0.45s var(--ease) !important;
}

/* ---- Navigation --------------------------------------------------------- */
#top-sentinel {
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 1px;
}
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border-bottom: 1px solid transparent;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(150%);
  backdrop-filter: blur(14px) saturate(150%);
  border-bottom-color: var(--border);
}
.nav-inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.nav-brand {
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
  font-size: 0.98rem;
  white-space: nowrap;
}
.nav-brand span {
  color: var(--text-3);
  font-weight: 500;
  margin-left: 0.15rem;
}
.nav-links {
  display: flex;
  gap: 0.35rem;
  margin-inline: auto;
}
.nav-links a {
  position: relative;
  color: var(--text-2);
  font-size: 0.9rem;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-links a:hover {
  color: var(--text);
  background: var(--bg-3);
}
.nav-links a.active {
  color: var(--text);
}
.nav-links a.active::after {
  content: "";
  position: absolute;
  left: 0.7rem;
  right: 0.7rem;
  bottom: 0.05rem;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 1px solid transparent;
  border-radius: 50%;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: color 0.2s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease);
}
.icon-btn:hover {
  color: var(--text);
  background: var(--bg-3);
  border-color: var(--border);
}
.theme-toggle .icon-moon {
  display: none;
}
[data-theme="dark"] .theme-toggle .icon-sun {
  display: none;
}
[data-theme="dark"] .theme-toggle .icon-moon {
  display: block;
}

/* Mobile burger */
.nav-burger {
  display: none;
}
.nav-burger span {
  position: absolute;
  width: 17px;
  height: 1.6px;
  background: currentColor;
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}
.nav-burger span:nth-child(1) {
  transform: translateY(-5px);
}
.nav-burger span:nth-child(3) {
  transform: translateY(5px);
}
.nav-burger[aria-expanded="true"] span:nth-child(1) {
  transform: rotate(45deg);
}
.nav-burger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}
.nav-burger[aria-expanded="true"] span:nth-child(3) {
  transform: rotate(-45deg);
}

/* Mobile menu overlay */
.mobile-menu {
  position: fixed;
  inset: var(--nav-h) 0 0 0;
  z-index: 90;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  padding: clamp(1.5rem, 6vw, 3rem) var(--gutter);
  opacity: 0;
  transform: translateY(-8px);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}
.mobile-menu[hidden] {
  display: none;
}
.mobile-menu.open {
  opacity: 1;
  transform: translateY(0);
}
.mobile-menu-links {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.mobile-menu-links a {
  color: var(--text);
  font-size: 1.6rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--border);
}
.mobile-menu-links a:last-child {
  border-bottom: none;
}

/* ---- Buttons / chips ---------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  height: 46px;
  padding: 0 1.4rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 500;
  white-space: nowrap;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s var(--ease), background 0.2s var(--ease),
    border-color 0.2s var(--ease), color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: var(--shadow-md);
}
[data-theme="dark"] .btn-primary {
  color: #07130d;
}
.btn-primary:hover {
  background: var(--accent-2);
  transform: translateY(-2px);
}
.btn-primary:active {
  transform: translateY(0);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border-2);
}
.btn-ghost:hover {
  background: var(--bg-3);
  border-color: var(--text-3);
  transform: translateY(-2px);
}
.btn-ghost:active {
  transform: translateY(0);
}

.link-reset {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  height: 30px;
  padding: 0 0.7rem;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.01em;
  color: var(--text-2);
  background: var(--bg-2);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
    background 0.18s var(--ease), transform 0.18s var(--ease);
}
.chip .icon-xs {
  opacity: 0.5;
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}
.chip:hover {
  color: var(--accent);
  border-color: var(--accent-line);
  background: var(--accent-soft);
  transform: translateY(-1px);
}
.chip:hover .icon-xs {
  opacity: 1;
  transform: translate(1px, -1px);
}

/* ---- Inline emphasis (highlighter wipe) -------------------------------- */
.hl {
  color: var(--accent);
  font-weight: 600;
  padding: 0.04em 0.16em;
  margin: 0 -0.1em;
  border-radius: 4px;
  background-image: linear-gradient(var(--hl-bg), var(--hl-bg));
  background-repeat: no-repeat;
  background-position: left center;
  background-size: 100% 100%;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
  transition: background-size 0.65s var(--ease) 0.3s;
}
/* before reveal: highlight collapsed; wipes in left-to-right when revealed */
.js .reveal:not(.in) .hl {
  background-size: 0% 100%;
}

/* ---- Hero --------------------------------------------------------------- */
.hero {
  position: relative;
  min-height: calc(100dvh - var(--nav-h));
  display: flex;
  align-items: center;
  padding-block: clamp(2.5rem, 6vw, 4rem);
  overflow: hidden;
}
.hero::before {
  /* soft neutral depth glow, not an AI-purple blob */
  content: "";
  position: absolute;
  z-index: -1;
  width: 60vw;
  height: 60vw;
  max-width: 720px;
  max-height: 720px;
  top: -18%;
  right: -10%;
  background: radial-gradient(
    circle,
    var(--accent-soft) 0%,
    transparent 62%
  );
  filter: blur(8px);
  pointer-events: none;
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr clamp(190px, 24vw, 268px);
  align-items: center;
  gap: clamp(2rem, 6vw, 4.5rem);
}
.hero-status {
  display: inline-flex;
  align-items: center;
  align-self: start;
  width: fit-content;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.01em;
  margin-bottom: 1.5rem;
}
.hero-name {
  font-size: clamp(2.9rem, 7.5vw, 5.1rem);
  letter-spacing: -0.04em;
  line-height: 0.98;
  margin-bottom: 1.4rem;
}
.hero-name-alt {
  display: inline-block;
  margin-left: 0.5rem;
  font-weight: 400;
  color: var(--text-3);
  letter-spacing: 0;
  font-size: 0.42em;
  vertical-align: middle;
}
.hero-role {
  max-width: 42ch;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  color: var(--text-2);
  margin-bottom: 2rem;
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 2rem;
}
.hero-socials {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 0.4rem;
}
.hero-socials a,
.hero-socials button {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  color: var(--text-2);
  border: 1px solid var(--border);
  background: var(--bg-2);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    transform 0.2s var(--ease), background 0.2s var(--ease);
}
.hero-socials a:hover,
.hero-socials button:hover {
  color: var(--accent);
  border-color: var(--accent-line);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* portrait */
.hero-portrait {
  position: relative;
  justify-self: center;
  width: 100%;
  max-width: 268px;
}
.portrait {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  background: var(--bg-3);
}
.portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 26%;
}
.hero-portrait::after {
  /* offset accent frame for editorial depth */
  content: "";
  position: absolute;
  inset: 12px -12px -12px 12px;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  z-index: -1;
  pointer-events: none;
}

/* ---- Sections (shared) -------------------------------------------------- */
.section {
  padding-block: var(--section-y);
  border-top: 1px solid var(--border);
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}
.section-title {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  letter-spacing: -0.03em;
  margin-bottom: clamp(2rem, 4vw, 3rem);
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.section-title .count {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-3);
  letter-spacing: 0;
}

/* ---- About -------------------------------------------------------------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.about-prose .lead {
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--text);
  margin-bottom: 1.3rem;
  text-wrap: pretty;
}
.about-prose p {
  color: var(--text-2);
  max-width: 60ch;
}
.about-prose .lead a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent-line);
  text-decoration-thickness: 1.5px;
  transition: text-decoration-color 0.2s var(--ease), color 0.2s var(--ease);
}
.about-prose .lead a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}
.about-facts dl {
  display: grid;
  gap: 0;
}
.about-facts div {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: 1rem;
  padding: 0.85rem 0;
  border-top: 1px solid var(--border);
}
.about-facts div:first-child {
  border-top: none;
  padding-top: 0;
}
.about-facts dt {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  padding-top: 0.15rem;
}
.about-facts dd {
  color: var(--text);
  font-size: 0.96rem;
}

/* ---- Timeline ----------------------------------------------------------- */
.timeline {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0;
}
.timeline li {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: 1.6rem 0;
  border-top: 1px solid var(--border);
  position: relative;
}
.timeline li:first-child {
  border-top: none;
}
.tl-period {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-3);
  padding-top: 0.3rem;
  letter-spacing: 0.01em;
}
.tl-body h3 {
  font-size: 1.2rem;
  margin-bottom: 0.25rem;
}
.tl-body p {
  color: var(--text-2);
  font-size: 0.96rem;
}

/* ---- Publications ------------------------------------------------------- */
.pubs {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0;
}
.pub {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(1.5rem, 3vw, 2.2rem) 0;
  border-top: 1px solid var(--border);
}
.pub:first-child {
  border-top: none;
  padding-top: 0;
}
.pub-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.55rem;
  padding-top: 0.2rem;
}
.pub-year {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.02em;
  line-height: 1;
}
.pub-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-2);
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  background: var(--bg-2);
}
.pub-honor {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
}
.pub-title {
  font-size: clamp(1.1rem, 1.8vw, 1.3rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin-bottom: 0.6rem;
}
.pub-title a {
  color: var(--text);
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0% 1.5px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.3s var(--ease), color 0.2s var(--ease);
}
.pub-title a:hover {
  color: var(--accent);
  background-size: 100% 1.5px;
}
.pub-authors {
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.55;
  margin-bottom: 0.3rem;
}
.pub-authors .me {
  color: var(--text);
  font-weight: 600;
}
.pub-venue {
  color: var(--text-3);
  font-size: 0.88rem;
  font-style: italic;
  margin-bottom: 1rem;
}
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---- Awards ------------------------------------------------------------- */
.awards {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1rem, 2.5vw, 1.75rem) clamp(1.5rem, 4vw, 3.5rem);
}
.awards li {
  display: grid;
  grid-template-columns: 3.5rem 1fr;
  gap: 1rem;
  align-items: start;
}
.aw-year {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent);
  padding-top: 0.18rem;
  letter-spacing: 0.02em;
}
.aw-name {
  color: var(--text);
  font-weight: 500;
  font-size: 1rem;
  line-height: 1.35;
}
.aw-name a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent-line);
  text-underline-offset: 3px;
  transition: color 0.2s var(--ease);
}
.aw-name a:hover {
  color: var(--accent);
}
.aw-org {
  color: var(--text-3);
  font-size: 0.86rem;
  margin-top: 0.1rem;
}

/* ---- Service ------------------------------------------------------------ */
.service {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0;
  max-width: 760px;
}
.service li {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: 1.5rem;
  padding: 1.1rem 0;
  border-top: 1px solid var(--border);
  align-items: baseline;
}
.service li:first-child {
  border-top: none;
  padding-top: 0;
}
.sv-role {
  font-weight: 500;
  color: var(--text);
  font-size: 0.95rem;
}
.sv-venue {
  color: var(--text-2);
  font-size: 0.95rem;
}

/* ---- Contact ------------------------------------------------------------ */
.contact-lead {
  max-width: 48ch;
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  color: var(--text-2);
  line-height: 1.5;
  margin-bottom: 1.8rem;
}
.contact-email {
  display: inline-block;
  font-size: clamp(1.4rem, 4vw, 2.4rem);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--text);
  background-image: linear-gradient(var(--accent), var(--accent));
  background-size: 0% 2px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: background-size 0.35s var(--ease), color 0.2s var(--ease);
  word-break: break-word;
}
.contact-email:hover {
  color: var(--accent);
  background-size: 100% 2px;
}
.contact-socials {
  list-style: none;
  padding: 0;
  margin-top: 2.2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}
.contact-socials a,
.contact-socials .chip-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border: 1px solid var(--border-2);
  border-radius: 999px;
  color: var(--text-2);
  background: var(--bg-2);
  font-size: 0.92rem;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease),
    background 0.2s var(--ease), transform 0.2s var(--ease);
}
.contact-socials a:hover,
.contact-socials .chip-link:hover {
  color: var(--accent);
  border-color: var(--accent-line);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

/* ---- Footer ------------------------------------------------------------- */
.footer {
  border-top: 1px solid var(--border);
  padding-block: 2.5rem;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer p {
  color: var(--text-3);
  font-size: 0.88rem;
}
.footer-top {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-2);
  font-size: 0.88rem;
  transition: color 0.2s var(--ease);
}
.footer-top:hover {
  color: var(--accent);
}
.footer-top .icon-xs {
  transform: rotate(-45deg);
}

/* ---- QR dialog ---------------------------------------------------------- */
.qr-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  background: var(--bg-2);
  color: var(--text);
  box-shadow: var(--shadow-lg);
  max-width: min(90vw, 340px);
  text-align: center;
}
.qr-dialog::backdrop {
  background: rgba(0, 0, 0, 0.55);
  -webkit-backdrop-filter: blur(3px);
  backdrop-filter: blur(3px);
}
.qr-dialog img {
  border-radius: var(--radius-sm);
  width: 100%;
  height: auto;
  margin-bottom: 0.75rem;
}
.qr-dialog p {
  color: var(--text-2);
  font-size: 0.85rem;
}
.qr-close {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  color: var(--text-3);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  border-radius: 50%;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.qr-close:hover {
  color: var(--text);
  background: var(--bg-3);
}

/* ---- Reveal motion ------------------------------------------------------ */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--reveal-dur) var(--ease),
    transform var(--reveal-dur) var(--ease);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}
.js .reveal.in {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
  .hero-portrait {
    max-width: 200px;
    justify-self: start;
  }
  .hero-portrait::after {
    inset: 9px -9px -9px 9px;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .about-facts {
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
    padding-top: 1.5rem;
  }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  .nav-burger {
    display: inline-grid;
    position: relative;
  }
  .awards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  body {
    font-size: 1rem;
  }
  .hero {
    min-height: auto;
    padding-top: 1.5rem;
    padding-bottom: 3.5rem;
  }
  .hero-portrait {
    max-width: 172px;
  }
  .hero-name-alt {
    display: block;
    margin-left: 0;
    margin-top: 0.4rem;
    font-size: 0.34em;
  }
  .timeline li,
  .pub,
  .service li {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .pub-meta {
    flex-direction: row;
    align-items: center;
    gap: 0.7rem;
  }
  .pub-year {
    font-size: 1.1rem;
  }
  .awards li {
    grid-template-columns: 3rem 1fr;
  }
}

/* ---- Reduced motion ----------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .js .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---- Reduced transparency fallback ------------------------------------- */
@media (prefers-reduced-transparency: reduce) {
  .nav.scrolled,
  .mobile-menu {
    background: var(--bg);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
  }
}