/* ============================================================
   Davide Rolfi — academic website
   Minimal, typographic, professional.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-soft: #f5f3ee;
  --ink: #171717;
  --ink-soft: #303030;
  --muted: #666666;
  --muted-soft: #8a8a8a;
  --rule: #d9d5cc;
  --rule-soft: #ebe7df;
  --accent: #2f4f6f;
  --accent-dark: #20384f;
  --accent-soft: #e9eff5;
  --shadow-subtle: 0 18px 50px rgba(20, 20, 20, 0.045);
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---------- Base ---------- */

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  font-feature-settings: "kern", "liga", "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

main.content {
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
  padding-top: 2.2rem;
  padding-bottom: 5.5rem;
}

p {
  color: var(--ink-soft);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 79, 111, 0.25);
  transition: color 0.15s ease, border-color 0.15s ease;
}

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

/* Visible keyboard focus — important for accessibility */
a:focus-visible,
button:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

strong {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- Navbar ---------- */

.navbar {
  background: rgba(251, 250, 247, 0.96) !important;
  border-bottom: 1px solid var(--rule-soft);
  box-shadow: none !important;
  backdrop-filter: blur(10px);
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.navbar .container-fluid {
  max-width: 940px;
  margin: 0 auto;
}

.navbar-title,
.navbar-brand {
  color: var(--ink) !important;
  font-weight: 700 !important;
  letter-spacing: -0.02em;
  border-bottom: none !important;
}

.navbar-nav .nav-link {
  color: var(--muted) !important;
  border-bottom: none !important;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  padding-left: 0.78rem !important;
  padding-right: 0.78rem !important;
  transition: color 0.15s ease;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--ink) !important;
}

/* ---------- Typography ---------- */

h1,
h2,
h3 {
  color: var(--ink);
  letter-spacing: -0.02em;
}

h1.title,
main.content > h1:first-child {
  font-size: 2.45rem;
  line-height: 1.08;
  margin-top: 0;
  margin-bottom: 1.4rem;
  font-weight: 700;
}

h2 {
  font-size: 0.86rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin-top: 3.3rem;
  margin-bottom: 1.35rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px solid var(--rule);
}

h3 {
  font-size: 1.22rem;
  line-height: 1.35;
  margin-top: 0;
  margin-bottom: 0.45rem;
  font-weight: 700;
}

/* ---------- Homepage ---------- */

.home-hero {
  max-width: 940px;
  margin: 0 auto;
  padding: 1.5rem 0 2.5rem 0;
}

.home-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 240px;
  gap: 3rem;
  align-items: start;
  margin-bottom: 0.5rem;
}

.home-hero-text {
  min-width: 0;
}

.home-hero-portrait {
  padding-top: 1.5rem;
}

.portrait-frame {
  width: 240px;
  height: 240px;
  border-radius: 4px;
  overflow: hidden;
  background: var(--accent-soft);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-subtle);
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  position: relative;
  z-index: 2;
}

.portrait-initials {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 4.5rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--accent);
  z-index: 1;
}

.home-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin: 0 0 1.2rem 0;
  padding: 0.42rem 0.78rem;
  border: 1px solid rgba(47, 79, 111, 0.18);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.home-kicker::before {
  content: "";
  width: 0.43rem;
  height: 0.43rem;
  border-radius: 999px;
  background: var(--accent);
}

.home-hero h1 {
  font-size: clamp(2.65rem, 5.4vw, 3.75rem);
  line-height: 1;
  letter-spacing: -0.04em;
  margin: 0 0 0.85rem 0;
  font-weight: 800;
}

.subtitle {
  max-width: 780px;
  margin: 0 0 0.35rem 0;
  color: var(--ink-soft);
  font-size: 1.16rem;
  line-height: 1.45;
  font-weight: 500;
}

.affiliation {
  margin: 0 0 1.85rem 0;
  color: var(--muted);
  font-size: 1rem;
}

.intro {
  max-width: 780px;
  margin: 0 0 1.35rem 0;
  color: var(--ink-soft);
  font-size: 1.04rem;
  line-height: 1.75;
}

.facts-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0;
  margin: 2rem 0 1.7rem 0;
  border-top: 1px solid var(--rule);
  border-left: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.5);
}

.facts-grid > div {
  padding: 1.15rem 1.2rem;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.label {
  margin: 0 0 0.35rem 0;
  color: var(--muted);
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.value {
  margin: 0;
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.55;
}

.small-muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.8rem;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-bottom: none !important;
  border-radius: 999px;
  padding: 0.7rem 1.1rem;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.005em;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}

.btn-primary {
  background: var(--ink);
  color: #ffffff !important;
  border: 1px solid var(--ink);
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff !important;
}

.btn-secondary {
  background: transparent;
  color: var(--ink) !important;
  border: 1px solid var(--rule);
}

.btn-secondary:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent-dark) !important;
}

/* ---------- Common content ---------- */

.page-intro {
  max-width: 820px;
  margin-bottom: 2.5rem;
  color: var(--ink-soft);
  font-size: 1.04rem;
  line-height: 1.75;
}

.paper-card {
  position: relative;
  margin: 1.2rem 0 1.55rem 0;
  padding: 1.3rem 0 1.3rem 1.25rem;
  border-left: 3px solid var(--rule);
  transition: border-color 0.2s ease;
}

.paper-card:hover {
  border-left-color: var(--muted-soft);
}

.paper-card.featured-paper {
  border-left-color: var(--accent);
  padding-left: 1.45rem;
}

.paper-card.featured-paper:hover {
  border-left-color: var(--accent-dark);
}

.paper-card h3 {
  margin-bottom: 0.45rem;
}

.paper-card p {
  color: var(--ink-soft);
  line-height: 1.7;
}

.paper-label {
  display: inline-block;
  margin-bottom: 0.65rem;
  color: var(--accent);
  font-size: 0.73rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.paper-meta {
  margin: 0 0 0.5rem 0;
  color: var(--muted);
  font-size: 0.93rem;
  font-style: italic;
}

.paper-coauthors {
  margin: 0 0 0.8rem 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.paper-links {
  display: flex;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin-top: 1.15rem;
}

.research-interests {
  max-width: 820px;
  color: var(--ink-soft);
  line-height: 1.75;
}

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

/* ---------- CV page ---------- */

.cv-panel {
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  margin: 1.8rem 0 2.2rem 0;
  padding: 1.4rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  box-shadow: 0 14px 38px rgba(20, 20, 20, 0.035);
}

.cv-panel h3 {
  margin: 0 0 0.35rem 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.cv-panel p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.cv-panel-action {
  flex-shrink: 0;
}

.cv-section {
  margin: 0.5rem 0 1.8rem 0;
}

.cv-entry {
  display: grid;
  grid-template-columns: 130px minmax(0, 1fr);
  gap: 1.4rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--rule-soft);
}

.cv-entry:last-child {
  border-bottom: none;
}

.cv-date {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 500;
  line-height: 1.4;
  padding-top: 0.15rem;
}

.cv-body {
  color: var(--ink);
  line-height: 1.55;
  font-size: 1rem;
}

.cv-body strong {
  display: block;
  margin-bottom: 0.15rem;
  font-weight: 600;
}

.cv-detail {
  display: block;
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.95rem;
  font-style: italic;
}

.cv-footnote {
  margin-top: 2.5rem;
  color: var(--muted);
  font-size: 0.9rem;
  font-style: italic;
}

/* ---------- Contact page ---------- */

.contact-panel {
  border-radius: 2px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(230px, 0.75fr);
  gap: 2rem;
  margin-top: 1.8rem;
  padding: 1.6rem 1.7rem;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  box-shadow: 0 14px 38px rgba(20, 20, 20, 0.035);
}

.contact-block h3,
.contact-links h3 {
  margin-bottom: 0.55rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.contact-block > p:first-of-type,
.contact-block > p:nth-of-type(1) {
  font-size: 1rem;
  line-height: 1.65;
}

.contact-block p {
  line-height: 1.65;
}

.contact-block strong {
  font-weight: 600;
}

.contact-panel a {
  font-weight: 500;
}

.contact-links ul {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.contact-links li {
  margin-bottom: 0.55rem;
  font-size: 0.98rem;
}

/* ---------- FAM events ---------- */

.event-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1.35rem;
  margin-top: 1.6rem;
}

.event-card {
  background: var(--surface);
  border: 1px solid var(--rule);
  transition: border-color 0.18s ease;
}

.event-card:hover {
  border-color: var(--accent);
}

.event-card a {
  border-bottom: none;
  display: block;
}

.event-card img {
  width: 100%;
  height: 280px;
  object-fit: contain;
  object-position: center;
  display: block;
  background: #111111;
}

.event-card-text {
  padding: 0.95rem 1rem 1.05rem 1rem;
}

.event-card-text h3 {
  margin: 0 0 0.25rem 0;
  font-size: 1.02rem;
  font-weight: 600;
}

.event-date {
  margin: 0 0 0.35rem 0;
  color: var(--accent);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.event-speakers {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.45;
}

/* ---------- Footer ---------- */

.nav-footer {
  border-top: 1px solid var(--rule-soft);
  color: var(--muted);
  font-size: 0.85rem;
  padding-top: 1.3rem;
  padding-bottom: 1.3rem;
}

.nav-footer a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
}

.nav-footer a:hover {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- Mobile ---------- */

@media (max-width: 820px) {
  body {
    font-size: 16px;
  }

  main.content {
    padding-top: 1.8rem;
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .navbar .container-fluid {
    padding-left: 1.15rem;
    padding-right: 1.15rem;
  }

  .home-hero {
    padding-top: 1.5rem;
  }

  .home-hero-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
    align-items: start;
  }

  .home-hero-portrait {
    order: -1;
    padding-top: 0;
  }

  .portrait-frame {
    width: 145px;
    height: 145px;
  }

  .portrait-initials {
    font-size: 3rem;
  }

  .home-hero h1 {
    font-size: 2.6rem;
  }

  .home-kicker {
    font-size: 0.68rem;
    letter-spacing: 0.09em;
    padding: 0.36rem 0.7rem;
  }

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

  .cv-panel,
  .contact-panel {
    display: block;
  }

  .cv-panel-action {
    margin-top: 1.1rem;
  }

  .cv-entry {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }

  .button-row {
    gap: 0.6rem;
  }

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

  .event-card img {
    height: 220px;
  }
}

@media (max-width: 480px) {
  .event-grid {
    grid-template-columns: 1fr;
  }

  .event-card img {
    height: 260px;
  }
}