/* ==========================================================================
   Academic Portfolio — Styles
   ========================================================================== */

/* Self-hosted fonts (SIL Open Font License 1.1, see assets/fonts/OFL-*.txt) */

@font-face {
  font-family: "Crimson Pro";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/crimson-pro-italic-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-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Crimson Pro";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("assets/fonts/crimson-pro-italic-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: "Crimson Pro";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("assets/fonts/crimson-pro-normal-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-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Crimson Pro";
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url("assets/fonts/crimson-pro-normal-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 Sans 3";
  font-style: normal;
  font-weight: 300 600;
  font-display: swap;
  src: url("assets/fonts/source-sans-3-normal-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-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
  font-family: "Source Sans 3";
  font-style: normal;
  font-weight: 300 600;
  font-display: swap;
  src: url("assets/fonts/source-sans-3-normal-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;
}

:root {
  --color-bg: #faf9f7;
  --color-bg-alt: #f0ede8;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #5c5c6e;
  --color-accent: #2d4a7c;
  --color-accent-light: #4a6fa5;
  --color-border: #ddd8d0;
  --color-highlight: #c4a35a;

  --font-serif: "Crimson Pro", Georgia, "Times New Roman", serif;
  --font-sans: "Source Sans 3", system-ui, sans-serif;

  --max-width: 1100px;
  --header-height: 64px;
  --radius: 6px;
  --shadow: 0 2px 12px rgba(26, 26, 46, 0.06);
  --transition: 0.2s ease;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition);
}

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

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.5rem 1rem;
  background: var(--color-accent);
  color: #fff;
  z-index: 200;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: 1rem;
}

/* Header & Navigation */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 249, 247, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: var(--header-height);
}

.nav-logo {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-text);
  text-decoration: none;
}

.nav-logo-photo {
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border);
}

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

.nav-menu {
  display: flex;
  gap: 1.75rem;
  list-style: none;
}

.nav-menu a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav-menu a:hover,
.nav-menu a.active {
  color: var(--color-accent);
}

/* Projects dropdown */
.nav-item-dropdown {
  position: relative;
}

.nav-dropdown-trigger::after {
  content: "";
  display: inline-block;
  width: 0.35rem;
  height: 0.35rem;
  margin-left: 0.35rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  vertical-align: middle;
  transition: transform var(--transition);
}

.nav-item-dropdown:hover .nav-dropdown-trigger::after,
.nav-item-dropdown:focus-within .nav-dropdown-trigger::after {
  transform: rotate(-135deg) translateY(1px);
}

.nav-submenu {
  list-style: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  min-width: 220px;
  padding: 0.5rem 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  z-index: 101;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
}

.nav-item-dropdown:hover .nav-submenu,
.nav-item-dropdown:focus-within .nav-submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-submenu a {
  display: block;
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  white-space: nowrap;
}

/* "Interactive" pill, on the ROHM project card and next to its menu link */
.project-badge,
.nav-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 10%, var(--color-surface));
  border-radius: 999px;
}

.nav-badge {
  margin-left: 0.4rem;
  padding: 0.1rem 0.45rem;
  font-size: 0.62rem;
  vertical-align: 0.1em;
}

.nav-submenu a:hover,
.nav-submenu a.active {
  background: var(--color-bg-alt);
  color: var(--color-accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition);
}

/* Hero */
.hero {
  background: var(--color-bg);
  padding: 2rem 0 5rem;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: start;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.hero-label {
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 600;
  line-height: 1.15;
  margin-bottom: 1rem;
  color: var(--color-text);
}

.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
  cursor: pointer;
  border: 1.5px solid transparent;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-light);
  color: #fff;
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn-secondary:hover {
  background: var(--color-accent);
  color: #fff;
}

.social-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  list-style: none;
}

.social-links a {
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text-muted);
}

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

.hero .social-links {
  margin: 0.5rem 0 0;
}

.hero .about-grid {
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin: 1rem 0 0;
}

.hero-about-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  position: relative;
  padding-bottom: 0.5rem;
}

.hero-about-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: var(--color-highlight);
  border-radius: 2px;
}

.hero .about-highlights {
  padding: 1rem 1.25rem;
  margin: 0;
}

.hero .about-highlights h3 {
  margin-bottom: 0.5rem;
}

.hero .about-highlights li {
  margin-bottom: 0.2rem;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 440px;
  height: 550px;
  object-fit: cover;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* Sections */
.section {
  padding: 4.5rem 0;
  background: var(--color-bg);
}

.section-alt {
  background: var(--color-bg-alt);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section-title {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  position: relative;
  padding-bottom: 0.75rem;
}

.section-title::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 48px;
  height: 3px;
  background: var(--color-highlight);
  border-radius: 2px;
}

.section-intro {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
}

.subsection-title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 3rem;
  margin-top: 2rem;
}

.about-text p + p {
  margin-top: 1rem;
}

.about-highlights {
  background: var(--color-surface);
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow);
}

.about-highlights h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
}

.about-highlights ul {
  list-style: none;
}

.about-highlights li {
  padding: 0.4rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--color-highlight);
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

/* Publications */
.publication-list {
  list-style: none;
  margin-top: 2rem;
}

.publications-show-all {
  margin-top: 2rem;
}

.page-back {
  margin-bottom: 1.5rem;
}

.page-back a {
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
}

.page-back a:hover {
  text-decoration: underline;
}

.publication-list + .publication-list {
  margin-top: 0;
}

.publication-divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 2rem 0;
}

.publication {
  display: grid;
  grid-template-columns: 60px 1fr;
  gap: 1.5rem;
  padding: 1.75rem 0;
  border-bottom: 1px solid var(--color-border);
}

.publication:last-child {
  border-bottom: none;
}

.pub-year {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-highlight);
}

.pub-title {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.pub-authors {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.pub-venue {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.pub-links {
  display: flex;
  gap: 1rem;
}

.pub-links a {
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
}

/* Projects grid */
.project-carousel {
  margin-top: 2rem;
  --project-gap: 1rem;
}

.project-track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--project-gap);
}

.project-carousel .project-card {
  min-height: 12rem;
  min-width: 0;
}

@media (max-width: 900px) {
  .project-track {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 600px) {
  .project-track {
    grid-template-columns: 1fr;
  }
}

.project-card {
  background: var(--color-surface);
  padding: 1.75rem;
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  display: flex;
  scroll-margin-top: calc(var(--header-height) + 1rem);
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

a.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(26, 26, 46, 0.1);
  border-color: var(--color-highlight);
}

.project-meta {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.project-card h3 {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  margin-bottom: 0.6rem;
}

.project-card p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: 1rem;
}

.project-link {
  font-size: 0.9rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--color-accent);
}

a.project-card:hover .project-link {
  color: var(--color-accent-light);
}

/* Card leading to an interactive application: magnetization loops computed with the model in the
   background (assets/rohm-loops.svg), faded under the text */
.project-card-interactive {
  background:
    linear-gradient(105deg, var(--color-surface) 30%, rgba(255, 255, 255, 0.7) 60%, rgba(255, 255, 255, 0.15) 100%),
    url("assets/rohm-loops.svg") right -2rem center / auto 125% no-repeat,
    var(--color-surface);
  border-color: color-mix(in srgb, var(--color-accent) 25%, var(--color-border));
}

.project-badge {
  align-self: flex-start;
  margin-bottom: 0.75rem;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
}

.project-badge span {
  font-size: 0.6rem;
}

/* Card of the nonlinear iterations explorer: power law and Newton-Raphson iterations in the background
   (assets/iterations-newton.svg) */
.project-card-iterations {
  background:
    linear-gradient(105deg, var(--color-surface) 35%, rgba(255, 255, 255, 0.6) 55%, rgba(255, 255, 255, 0) 80%),
    url("assets/iterations-newton.svg") right 0.5rem center / auto 104% no-repeat,
    var(--color-surface);
}

/* Project detail pages */
.project-page .section-title {
  margin-bottom: 0.75rem;
}

.project-detail {
  margin-top: 2.5rem;
}

.project-detail .subsection-title {
  margin-top: 2rem;
}

.project-detail .subsection-title:first-child {
  margin-top: 0;
}

.project-list {
  list-style: disc;
  padding-left: 1.25rem;
  color: var(--color-text-muted);
}

.project-list li + li {
  margin-top: 0.35rem;
}

.project-page-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2.5rem;
}

.skills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  list-style: none;
}

.skills-list li {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-text-muted);
}

/* Contact */
.contact-info {
  margin-top: 2rem;
}

.contact-info p {
  color: var(--color-text-muted);
  margin-bottom: 1.5rem;
}

.contact-details {
  list-style: none;
}

.contact-details li {
  margin-bottom: 1.25rem;
}

.contact-details li:last-child {
  margin-bottom: 0;
}

.contact-label {
  display: block;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.site-footer p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    padding: 1.5rem;
    gap: 1rem;
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-menu.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-item-dropdown {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .nav-submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    min-width: 0;
    padding: 0;
    margin: 0;
    border: none;
    box-shadow: none;
    background: transparent;
  }

  .nav-submenu a {
    padding: 0.35rem 0 0.35rem 0.75rem;
    font-size: 0.9rem;
    white-space: normal;
  }

  .nav-submenu a:hover,
  .nav-submenu a.active {
    background: transparent;
  }

  .hero {
    padding-top: 1.5rem;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .social-links {
    justify-content: center;
  }

  .hero-photo {
    order: -1;
  }

  .hero-photo img {
    width: 320px;
    height: 400px;
    margin: 0 auto;
  }

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

  .publication {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
}