/* --- Design tokens --- */
:root {
  --maxw: 1040px;
  --page: #fbfaf7;
  --surface: #ffffff;
  --surface-soft: #f7f3ef;
  --text: #272321;
  --muted: #716965;
  --accent: #9a4f43;
  --accent-strong: #70372f;
  --accent-soft: #f3e7e3;
  --border: #ddd6d1;
  --shadow: none;
  --radius: 0;
  --padx: 28px;
}

/* --- Base --- */
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  background: var(--page);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease, transform 160ms ease;
}

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

a:focus-visible,
summary:focus-visible {
  outline: 3px solid rgba(154, 79, 67, 0.22);
  outline-offset: 4px;
  border-radius: 3px;
}

/* --- Site header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background: rgba(251, 250, 247, 0.96);
  border-bottom: 1px solid var(--border);
  box-shadow: none;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header .inner {
  max-width: var(--maxw);
  min-height: 66px;
  margin: 0 auto;
  padding: 10px var(--padx);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 720;
  letter-spacing: -0.015em;
  text-decoration: none;
}

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

.header-right,
.site-nav {
  display: flex;
  align-items: center;
}

.header-right {
  gap: 18px;
}

.site-nav {
  gap: 4px;
}

.site-nav a {
  position: relative;
  padding: 7px 10px;
  border-radius: 0;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 520;
  text-decoration: none;
}

.site-nav a:hover {
  background: transparent;
  color: var(--accent-strong);
}

.site-nav a.active {
  background: transparent;
  color: var(--accent);
  font-weight: 680;
}

.site-nav a.active::after {
  position: absolute;
  right: 10px;
  bottom: 2px;
  left: 10px;
  height: 1px;
  background: currentColor;
  content: "";
}

/* --- Page shell --- */
.container {
  width: calc(100% - 40px);
  max-width: var(--maxw);
  margin: 62px auto 72px;
  padding: 0 var(--padx) 40px;
  background: transparent;
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

/* --- Home layout --- */
.home-grid {
  display: grid;
  grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
  gap: 54px;
  align-items: start;
}

.photo {
  min-width: 0;
  text-align: center;
}

.photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border: 0;
  border-radius: 2px;
  box-shadow: none;
}

.content {
  min-width: 0;
}

/* --- Typography --- */
h1,
h2 {
  color: var(--text);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  font-weight: 600;
  letter-spacing: -0.025em;
}

h1 {
  margin: 0 0 0.3rem;
  font-size: clamp(2.15rem, 4vw, 3rem);
  line-height: 1.12;
}

h2 {
  margin: 1rem 0 0.45rem;
  font-size: 1.45rem;
}

hr {
  width: 44px;
  margin: 1rem 0 1.8rem;
  border: 0;
  border-top: 2px solid var(--accent);
}

p {
  margin: 0 0 1.2rem;
}

main p,
.content p {
  max-width: 68ch;
  text-align: left;
  hyphens: auto;
  -webkit-hyphens: auto;
  -ms-hyphens: auto;
}

.contact-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px;
  margin-top: 28px !important;
  padding: 15px 0 0;
  background: transparent;
  border: 0;
  border-top: 1px solid var(--border);
  border-radius: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* --- Research page --- */
.research-list {
  display: grid;
  gap: 0;
  margin: 34px 0 0 !important;
  padding: 0 !important;
  list-style: none !important;
  border-top: 1px solid var(--border);
}

.research-item {
  margin: 0 !important;
  padding: 26px 2px 25px;
  overflow: visible;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  transition: none;
}

.research-item:hover {
  border-color: var(--border);
  box-shadow: none;
  transform: none;
}

.research-item .title {
  color: var(--text);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  font-size: 1.13rem;
  line-height: 1.4;
}

.research-item .coauthors,
.research-item .links {
  color: var(--muted);
  font-size: 0.94rem;
}

.research-item details {
  margin: 12px 0 0 !important;
  padding-top: 0;
  border-top: 0;
}

.research-item summary {
  width: max-content;
  cursor: pointer;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 680 !important;
  list-style-position: outside;
}

.research-item details[open] summary {
  margin-bottom: 12px;
  color: var(--accent-strong);
}

.research-item details p {
  max-width: 78ch;
  margin-bottom: 0.85rem;
  color: #35434f;
  font-size: 0.95rem;
  line-height: 1.7;
}

.research-item details p:last-child {
  margin-bottom: 0;
}

/* --- Buttons --- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 2px;
  box-shadow: none;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 650;
  text-decoration: none;
}

.button:hover {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
  color: #fff;
  box-shadow: none;
  transform: none;
}

/* --- Footer --- */
footer {
  margin-top: 42px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.86rem;
  letter-spacing: 0.01em;
}

.content footer {
  margin-top: 24px !important;
}

/* --- Responsive --- */
@media (max-width: 760px) {
  :root {
    --padx: 20px;
  }

  .site-header .inner {
    min-height: 62px;
  }

  .container {
    width: calc(100% - 28px);
    margin: 38px auto 46px;
    padding: 0 14px 30px;
  }

  .home-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .photo {
    width: min(74vw, 270px);
    margin: 0 auto;
  }

  .content {
    width: 100%;
  }

  h1 {
    font-size: clamp(2rem, 10vw, 2.55rem);
  }

  .research-item {
    padding: 22px 1px;
  }
}

@media (max-width: 600px) {
  .site-header .inner {
    flex-direction: column;
    align-items: stretch;
    gap: 7px;
    padding-top: 11px;
    padding-bottom: 10px;
  }

  .brand {
    justify-content: center;
  }

  .header-right {
    justify-content: center;
    gap: 8px;
  }

  .site-nav {
    justify-content: center;
  }

  .site-nav a {
    padding: 5px 9px;
    font-size: 0.9rem;
  }

  .container {
    width: calc(100% - 20px);
    margin-top: 32px;
    padding: 0 10px 28px;
    border-radius: 0;
  }

  .home-grid {
    gap: 27px;
  }

  .photo {
    width: min(72vw, 245px);
  }

  .contact-line {
    padding: 14px 0 0;
  }

  .research-list {
    gap: 0;
    margin-top: 24px !important;
  }

  .research-item {
    padding: 21px 1px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}