/* ============================================
   Ettore Rocchi - Personal Academic Website
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors - Light Mode */
  --color-bg: #fafaf8;
  --color-bg-alt: #f0eeeb;
  --color-text: #1a1a2e;
  --color-text-muted: #5a5a6e;
  --color-accent: #2c3e6b;
  --color-accent-hover: #1e2d50;
  --color-border: #d8d6d0;
  --color-card-bg: #ffffff;
  --color-card-shadow: rgba(0, 0, 0, 0.06);
  --color-tag-bg: #e8e6f0;
  --color-tag-text: #2c3e6b;
  --color-oa-bg: #e8f5e9;
  --color-oa-text: #2e7d32;
  --color-nav-bg: rgba(250, 250, 248, 0.92);
  --color-hero-gradient: linear-gradient(160deg, #fafaf8 0%, #eeeef4 100%);

  /* Typography */
  --font-heading: "Playfair Display", "Georgia", "Times New Roman", serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;

  /* Spacing */
  --section-padding: 6rem 0;
  --container-width: 1080px;
  --container-padding: 0 2rem;

  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.4s ease;
  --transition-slow: 0.6s ease;
}

[data-theme="dark"] {
  --color-bg: #1a1a2e;
  --color-bg-alt: #22223a;
  --color-text: #e8e6e1;
  --color-text-muted: #a0a0b0;
  --color-accent: #5b7fc7;
  --color-accent-hover: #7a9bdf;
  --color-border: #3a3a52;
  --color-card-bg: #22223a;
  --color-card-shadow: rgba(0, 0, 0, 0.2);
  --color-tag-bg: #2a2a45;
  --color-tag-text: #8eaadc;
  --color-oa-bg: #1a3a2a;
  --color-oa-text: #66bb6a;
  --color-nav-bg: rgba(26, 26, 46, 0.92);
  --color-hero-gradient: linear-gradient(160deg, #1a1a2e 0%, #22223a 100%);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.7;
  transition: background-color var(--transition-medium), color var(--transition-medium);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

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

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

/* --- Container --- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-text);
}

h1 { font-size: 3.2rem; }
h2 { font-size: 2.2rem; margin-bottom: 1rem; }
h3 { font-size: 1.4rem; margin-bottom: 0.6rem; }
h4 { font-size: 1.1rem; }

p {
  margin-bottom: 1.2rem;
  color: var(--color-text);
}

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

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 640px;
  margin-bottom: 3rem;
}

/* --- Navigation --- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-medium), border-color var(--transition-medium);
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.02em;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Theme Toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 38px;
  height: 38px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  font-size: 1.1rem;
}

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

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

[data-theme="dark"] .theme-toggle .icon-sun {
  display: inline;
}

:root:not([data-theme="dark"]) .theme-toggle .icon-sun {
  display: none;
}

:root:not([data-theme="dark"]) .theme-toggle .icon-moon {
  display: inline;
}

[data-theme="dark"] .theme-toggle .icon-moon {
  display: none;
}

/* Hamburger */
.nav-hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--color-text);
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
  transition: all var(--transition-fast);
  border-radius: 2px;
}

.nav-hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-hamburger.active span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--color-hero-gradient);
  padding-top: 64px;
  transition: background var(--transition-medium);
}

.hero-content {
  display: flex;
  align-items: center;
  gap: 4rem;
}

.hero-text {
  flex: 1;
}

.hero-avatar {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  flex-shrink: 0;
  overflow: hidden;
  box-shadow: 0 8px 32px var(--color-card-shadow);
  border: 3px solid var(--color-border);
}

.hero-avatar img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
}

.hero-role {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.8rem;
}

.hero h1 {
  margin-bottom: 1rem;
}

.hero-tagline {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-style: italic;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.hero-subline {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 1.8rem;
}

.hero-bio {
  font-size: 1.05rem;
  max-width: 600px;
  margin-bottom: 2rem;
}

.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.6rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px var(--color-card-shadow);
}

.btn-outline {
  background: transparent;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
}

.btn-outline:hover {
  background: var(--color-accent);
  color: #fff;
  transform: translateY(-1px);
}

/* --- Sections --- */
section {
  padding: var(--section-padding);
}

section:nth-child(even) {
  background-color: var(--color-bg-alt);
}

.section-header {
  margin-bottom: 3rem;
}

.section-header h2::after {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  background: var(--color-accent);
  margin-top: 0.8rem;
  border-radius: 2px;
}

/* --- About Section --- */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about-narrative p {
  font-size: 1.02rem;
}

.about-sidebar {
  background: var(--color-card-bg);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 2px 16px var(--color-card-shadow);
  border: 1px solid var(--color-border);
  transition: background-color var(--transition-medium), border-color var(--transition-medium), box-shadow var(--transition-medium);
}

.about-sidebar h3 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  margin-bottom: 1.2rem;
}

.sidebar-item {
  margin-bottom: 1.2rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.sidebar-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-bottom: 0.3rem;
}

.sidebar-value {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: 0;
}

.what-i-do {
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 1px solid var(--color-border);
}

.what-i-do h3 {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  margin-bottom: 1.2rem;
}

/* --- Research Section --- */
.research-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.research-card {
  background: var(--color-card-bg);
  border-radius: 12px;
  padding: 2.2rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
  box-shadow: 0 2px 16px var(--color-card-shadow);
}

.research-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px var(--color-card-shadow);
}

.research-icon {
  font-size: 1.8rem;
  margin-bottom: 1rem;
}

.research-card h3 {
  font-family: var(--font-heading);
  color: var(--color-accent);
}

.research-card p {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 0.8rem;
}

.research-methods {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--color-accent);
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

/* --- Projects Section --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.project-card {
  background: var(--color-card-bg);
  border-radius: 12px;
  padding: 2rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
  box-shadow: 0 2px 16px var(--color-card-shadow);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px var(--color-card-shadow);
  border-color: var(--color-accent);
}

.project-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.8rem;
}

.project-name {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-accent);
}

.project-link {
  font-size: 0.85rem;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.project-oneliner {
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 0.6rem;
}

.project-description {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  flex-grow: 1;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.tag {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  letter-spacing: 0.02em;
  font-weight: 500;
}

.project-why {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--color-text-muted);
  margin-top: 0.8rem;
  margin-bottom: 0;
}

/* --- Publications Section --- */
.publications-intro {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.pub-list {
  list-style: none;
}

.pub-item {
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--color-border);
}

.pub-item:first-child {
  padding-top: 0;
}

.pub-item:last-child {
  border-bottom: none;
}

.pub-meta {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.6rem;
  flex-wrap: wrap;
}

.pub-year {
  font-size: 0.78rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--color-accent);
  background: var(--color-tag-bg);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
}

.pub-journal {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.pub-oa {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-oa-text);
  background: var(--color-oa-bg);
  padding: 0.15rem 0.55rem;
  border-radius: 4px;
}

.pub-title {
  font-family: var(--font-heading);
  font-size: 1.12rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  line-height: 1.4;
}

.pub-authors {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
}

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

.pub-links {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
}

.pub-links a {
  font-size: 0.82rem;
  font-weight: 600;
}

/* BibTeX Toggle */
.bibtex-toggle {
  margin-top: 0.6rem;
}

.bibtex-toggle summary {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.bibtex-toggle summary::-webkit-details-marker {
  display: none;
}

.bibtex-toggle summary::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 0.9rem;
  transition: transform var(--transition-fast);
}

.bibtex-toggle[open] summary::before {
  content: "\2212";
}

.bibtex-code {
  margin-top: 0.8rem;
  padding: 1rem 1.2rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-all;
  overflow-x: auto;
  position: relative;
}

.bibtex-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 0.3rem 0.6rem;
  font-size: 0.72rem;
  font-family: var(--font-mono);
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
}

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

/* --- Contact Section --- */
.contact-content {
  max-width: 640px;
}

.contact-content p {
  font-size: 1.05rem;
  margin-bottom: 2rem;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.5rem;
}

.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.2rem;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
  transition: all var(--transition-fast);
}

.contact-link:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--color-card-shadow);
}

.contact-email {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--color-accent);
  font-weight: 600;
}

.contact-location {
  font-size: 0.92rem;
  color: var(--color-text-muted);
  margin-top: 2rem;
}

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

.footer p {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.fade-in-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in-stagger.visible > *:nth-child(1) { transition-delay: 0.05s; }
.fade-in-stagger.visible > *:nth-child(2) { transition-delay: 0.12s; }
.fade-in-stagger.visible > *:nth-child(3) { transition-delay: 0.19s; }
.fade-in-stagger.visible > *:nth-child(4) { transition-delay: 0.26s; }
.fade-in-stagger.visible > *:nth-child(5) { transition-delay: 0.33s; }
.fade-in-stagger.visible > *:nth-child(6) { transition-delay: 0.40s; }

.fade-in-stagger.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .fade-in {
    opacity: 1;
    transform: none;
  }

  .fade-in-stagger > * {
    opacity: 1;
    transform: none;
  }
}

/* --- Section CTA --- */
.section-cta {
  margin-top: 3rem;
  text-align: center;
}

.section-cta .btn {
  font-family: var(--font-body);
}

/* --- Sub-page Header (research.html, projects.html, publications.html) --- */
.page-header {
  padding: 9rem 0 4rem;
  background: var(--color-hero-gradient);
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-medium), border-color var(--transition-medium);
}

.page-eyebrow {
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

.page-header h1 {
  font-size: 2.6rem;
  margin-bottom: 1.2rem;
  max-width: 760px;
}

.page-lede {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 720px;
  margin-bottom: 1rem;
  line-height: 1.7;
}

.page-lede-meta {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  max-width: 720px;
  margin-bottom: 1.5rem;
}

.page-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 1.4rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.page-toc a {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

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

/* --- Research Areas (research.html) --- */
.research-area {
  padding: 5rem 0;
}

.area-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 4rem;
  align-items: start;
}

.area-text .area-number {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.6rem;
}

.area-text h2 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.area-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1.6rem;
}

.area-tags span {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.25rem 0.7rem;
  border-radius: 20px;
  letter-spacing: 0.02em;
}

.area-text p {
  font-size: 1.02rem;
  line-height: 1.75;
}

.area-side {
  background: var(--color-card-bg);
  border-radius: 12px;
  padding: 1.8rem;
  border: 1px solid var(--color-border);
  box-shadow: 0 2px 16px var(--color-card-shadow);
  position: sticky;
  top: 96px;
  transition: background-color var(--transition-medium), border-color var(--transition-medium), box-shadow var(--transition-medium);
}

.area-side h3 {
  font-family: var(--font-body);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  margin-top: 1.3rem;
  margin-bottom: 0.8rem;
}

.area-side h3:first-child {
  margin-top: 0;
}

.area-projects {
  list-style: none;
  margin-bottom: 0.5rem;
}

.area-projects li {
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.95rem;
}

.area-projects li:last-child {
  border-bottom: none;
}

.area-projects li a {
  font-family: var(--font-mono);
  font-weight: 600;
  display: block;
  margin-bottom: 0.15rem;
}

.area-projects li span {
  display: block;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.area-paper {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0;
}

.area-paper a {
  display: block;
  margin-top: 0.6rem;
  font-weight: 600;
}

/* --- Project Section (projects.html) --- */
.project-section {
  padding: 5rem 0;
}

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

.project-section-label {
  font-family: var(--font-body);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.8rem;
}

.project-section h2 {
  margin-bottom: 2rem;
}

.project-section-lede {
  font-size: 1.02rem;
  color: var(--color-text-muted);
  max-width: 760px;
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

/* --- Clinical ML Frameworks (tier between flagship and standalone) --- */
.frameworks-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem;
}

.framework-card {
  background: var(--color-card-bg);
  border-radius: 14px;
  padding: 2.2rem;
  border: 1px solid var(--color-border);
  border-left: 3px solid var(--color-accent);
  box-shadow: 0 2px 16px var(--color-card-shadow);
  display: flex;
  flex-direction: column;
  transition: all var(--transition-fast);
}

.framework-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px var(--color-card-shadow);
  border-color: var(--color-accent);
}

.framework-card-head {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.framework-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  background: var(--color-accent);
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
}

.framework-card h3 {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  color: var(--color-accent);
  margin-bottom: 0;
  flex: 1 0 auto;
}

.framework-oneliner {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.framework-description {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: 1.2rem;
}

.framework-description code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
}

.framework-meta {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 0.8rem 1rem;
  background: var(--color-bg-alt);
  border-radius: 6px;
  margin-bottom: 1.2rem;
  line-height: 1.5;
}

.framework-meta strong {
  color: var(--color-text);
  font-weight: 600;
}

/* --- Featured Project (MaldiSuite) --- */
.project-feature {
  background: var(--color-card-bg);
  border-radius: 16px;
  padding: 2.5rem;
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 24px var(--color-card-shadow);
  transition: background-color var(--transition-medium), border-color var(--transition-medium), box-shadow var(--transition-medium);
}

.project-feature-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.project-feature-head h2 {
  margin-bottom: 0;
  font-size: 2rem;
  color: var(--color-accent);
  flex: 1 0 auto;
}

.project-feature-lede {
  font-size: 1.05rem;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  max-width: 760px;
  line-height: 1.7;
}

.btn-small {
  padding: 0.45rem 1rem;
  font-size: 0.8rem;
}

/* --- Ecosystem Cards (3 sub-packages of MaldiSuite) --- */
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.ecosystem-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.4rem;
  transition: all var(--transition-fast);
}

.ecosystem-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.ecosystem-card h3 {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  color: var(--color-accent);
  margin-bottom: 0.2rem;
}

.ecosystem-card .eco-role {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.8rem;
}

.ecosystem-card p {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: 0.8rem;
}

.ecosystem-card a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  word-break: break-all;
}

/* --- Inline Ecosystem Pills (used in home page synthesized card) --- */
.ecosystem-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0.6rem 0 1rem;
}

.eco-pill {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 0.3rem 0.75rem;
  background: var(--color-tag-bg);
  color: var(--color-tag-text);
  border-radius: 6px;
  font-weight: 600;
  transition: all var(--transition-fast);
}

.eco-pill:hover {
  background: var(--color-accent);
  color: #fff;
}

/* --- Featured Project Card (synthesized version on home) --- */
.project-card-feature {
  grid-column: 1 / -1;
  border-color: var(--color-accent);
}

.project-card-feature .project-name {
  font-size: 1.4rem;
}

/* --- Tech Stack --- */
.stack-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.stack-item {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1.2rem 1rem;
  text-align: center;
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
}

.stack-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px var(--color-card-shadow);
}

.stack-logo {
  width: 36px;
  height: 36px;
  color: var(--color-accent);
  fill: currentColor;
  margin-bottom: 0.5rem;
  transition: color var(--transition-fast);
}

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

.stack-logo .logo-eye {
  fill: var(--color-card-bg);
}

.stack-name {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--color-accent);
}

/* --- Publication Filters --- */
.pub-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.pub-filter {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 0.4rem 0.9rem;
  border-radius: 20px;
  border: 1px solid var(--color-border);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.pub-filter.active {
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}

.pub-empty {
  text-align: center;
  color: var(--color-text-muted);
  padding: 2rem 0;
  font-style: italic;
}

/* --- Back CTA (sub-pages bottom) --- */
.back-cta {
  padding: 4rem 0;
  text-align: center;
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  transition: background-color var(--transition-medium), border-color var(--transition-medium);
}

.back-cta .container {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* --- Active nav link (multi-page) --- */
body[data-page="research"] .nav-links a[data-nav="research"],
body[data-page="projects"] .nav-links a[data-nav="projects"],
body[data-page="publications"] .nav-links a[data-nav="publications"] {
  color: var(--color-accent);
}

body[data-page="research"] .nav-links a[data-nav="research"]::after,
body[data-page="projects"] .nav-links a[data-nav="projects"]::after,
body[data-page="publications"] .nav-links a[data-nav="publications"]::after {
  width: 100%;
}

/* --- Reset section bg-alt for sub-pages (page-header takes care of intro) --- */
.research-area:nth-child(even) {
  background: var(--color-bg-alt);
  transition: background-color var(--transition-medium);
}

/* --- Responsive: Tablet --- */
@media (max-width: 768px) {
  h1 { font-size: 2.4rem; }
  h2 { font-size: 1.8rem; }
  h3 { font-size: 1.2rem; }

  :root {
    --section-padding: 4rem 0;
  }

  /* Nav */
  .nav-hamburger {
    display: block;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-nav-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: 1rem 0;
  }

  .nav-menu.open {
    display: block;
  }

  .nav-links {
    flex-direction: column;
    gap: 0;
    padding: 0 2rem;
  }

  .nav-links li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-links li:last-child {
    border-bottom: none;
  }

  .nav-links a {
    display: block;
    padding: 0.8rem 0;
  }

  /* Hero */
  .hero-content {
    flex-direction: column-reverse;
    text-align: center;
    gap: 2rem;
  }

  .hero-avatar {
    width: 140px;
    height: 140px;
    font-size: 2.8rem;
  }

  .hero-buttons {
    justify-content: center;
  }

  .hero-bio {
    margin-left: auto;
    margin-right: auto;
  }

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

  /* Research & Projects */
  .research-grid,
  .projects-grid {
    grid-template-columns: 1fr;
  }

  /* Sub-page header */
  .page-header {
    padding: 7rem 0 3rem;
  }

  .page-header h1 {
    font-size: 2rem;
  }

  /* Research areas */
  .area-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .area-side {
    position: static;
  }

  /* Ecosystem cards */
  .ecosystem-grid {
    grid-template-columns: 1fr;
  }

  /* Framework cards */
  .frameworks-grid {
    grid-template-columns: 1fr;
  }

  .framework-card {
    padding: 1.6rem;
  }

  .framework-card h3 {
    font-size: 1.2rem;
  }

  /* Featured project header */
  .project-feature {
    padding: 1.8rem;
  }

  .project-feature-head h2 {
    font-size: 1.6rem;
  }

  /* Tech stack */
  .stack-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* Featured card spans full row already via grid-column */
  .project-card-feature {
    grid-column: 1;
  }
}

/* --- Responsive: Mobile --- */
@media (max-width: 480px) {
  h1 { font-size: 2rem; }

  :root {
    --container-padding: 0 1.2rem;
  }

  .hero-tagline {
    font-size: 1.1rem;
  }

  .btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
  }

  .hero-buttons {
    gap: 0.6rem;
  }

  .contact-links {
    flex-direction: column;
  }

  .pub-meta {
    gap: 0.5rem;
  }
}