/* ---------------------------------------------------------------------------
   edoardodusi.com — minimal, elegant, fast.
   No external requests: system fonts, inline icons.
--------------------------------------------------------------------------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600&display=swap');

:root {
  --bg: #f2efe9;
  --fg: #1a1a1a;
  --muted: #6b6a66;
  --faint: #767470;
  --line: rgba(26, 26, 26, 0.1);
  --accent: #0f766e;
  --accent-soft: rgba(15, 118, 110, 0.08);
  --nav-bg: rgba(250, 249, 247, 0.82);
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #121314;
  --fg: #eceae6;
  --muted: #a3a19b;
  --faint: #9c9a94;
  --line: rgba(236, 234, 230, 0.12);
  --accent: #4fd1c5;
  --accent-soft: rgba(79, 209, 197, 0.09);
  --nav-bg: rgba(18, 19, 20, 0.82);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  background: var(--bg);
  color: var(--fg);
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 50vh;
  background: radial-gradient(ellipse at 15% 0%, var(--accent-soft) 0%, transparent 60%),
              radial-gradient(ellipse at 85% 0%, rgba(15, 118, 110, 0.05) 0%, transparent 60%);
  pointer-events: none;
  z-index: -1;
}

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

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-color: var(--faint);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover, a:focus-visible {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 1rem;
  z-index: 100;
}
.skip-link:focus { left: 0; }

/* --- Nav ------------------------------------------------------------------ */

.site-head {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-nav {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.brand {
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-size: 1.35rem;
  text-decoration: none;
  margin-right: auto;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 1.1rem;
  font-size: 0.85rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
}

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

.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.theme-toggle:hover { color: var(--accent); border-color: var(--accent); transform: rotate(15deg); }

/* --- Hamburger toggle ------------------------------------------------------- */

.nav-toggle {
  display: none;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

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

.nav-toggle .bar {
  transition: transform 0.25s ease, opacity 0.2s ease;
  transform-origin: center;
}

.nav-toggle[aria-expanded="true"] .bar-1 {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .bar-2 {
  opacity: 0;
}
.nav-toggle[aria-expanded="true"] .bar-3 {
  transform: translateY(-6px) rotate(-45deg);
}

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

/* --- Layout --------------------------------------------------------------- */

main {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Hero ------------------------------------------------------------------ */

.hero { padding: 5.5rem 0 4rem; }

.kicker {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--faint);
  margin-bottom: 0.75rem;
}

.hero h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  font-size: clamp(2.6rem, 7vw, 3.8rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
}

.tagline {
  font-size: 1.25rem;
  margin-bottom: 1rem;
}

.tagline a { text-decoration-color: var(--accent); }

.intro {
  color: var(--muted);
  max-width: 38rem;
}

/* --- Sections --------------------------------------------------------------- */

.section {
  padding: 3rem 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 3.5rem; /* keep headings clear of the sticky nav */
}

.section h2 {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 2rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.section-num {
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
  letter-spacing: 0;
}

.year {
  font-family: Georgia, "Times New Roman", serif;
  font-style: italic;
  font-weight: 400;
  font-size: 1.05rem;
  color: var(--faint);
  margin: 1.75rem 0 0.5rem;
}

.year:first-of-type { margin-top: 0; }

/* --- Rows ------------------------------------------------------------------ */

.stack { list-style: none; }

.row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.8rem 0;
}

.row + .row { border-top: 1px solid var(--line); }

.row-main a, .talk { font-weight: 500; }

.row-main a { text-decoration: none; }
.row-main a:hover, .row-main a:focus-visible { color: var(--accent); }

.row-main p {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.2rem;
}

.venue a {
  text-decoration: underline;
  text-decoration-color: var(--faint);
}

.sublinks { display: block; margin-top: 0.3rem; font-size: 0.85rem; }
.sublinks a { color: var(--accent); text-decoration: none; }
.sublinks a:hover { text-decoration: underline; }

.row-meta {
  flex-shrink: 0;
  font-size: 0.8rem;
  font-variant-numeric: tabular-nums;
  color: var(--faint);
  white-space: nowrap;
}

.more {
  margin-top: 1.75rem;
  font-size: 0.92rem;
  color: var(--muted);
}

/* --- Link grid ---------------------------------------------------------------- */

.link-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.link-grid a {
  display: block;
  padding: 0.7rem 1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  text-align: center;
  transition: border-color 0.15s ease, background-color 0.15s ease, color 0.15s ease;
}

.link-grid a:hover, .link-grid a:focus-visible {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

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

.site-foot {
  border-top: 1px solid var(--line);
  margin-top: 3rem;
}

.foot-row {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.site-foot p {
  font-size: 0.85rem;
  color: var(--faint);
}

.site-foot a {
  font-size: 0.85rem;
  color: var(--faint);
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-foot a:hover, .site-foot a:focus-visible {
  color: var(--accent);
}

/* --- Reveal animation ------------------------------------------------------------ */

/* Hidden state only applies once JS confirms it can reveal (.reveal-ready),
   so content always shows if the script fails to load. */
@media (prefers-reduced-motion: no-preference) {
  .reveal-ready .reveal {
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.55s ease, transform 0.55s ease;
  }
  .reveal-ready .reveal.is-visible { opacity: 1; transform: none; }
}

/* --- Responsive -------------------------------------------------------------------- */

@media (max-width: 640px) {
  .nav-toggle { display: grid; }

  .nav-links {
    visibility: hidden;
    opacity: 0;
    transform: translateY(-6px);
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    display: flex;
    gap: 0;
    padding: 0.5rem 1.5rem 1rem;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    font-size: 1rem;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
  }

  .nav-links.is-open {
    visibility: visible;
    opacity: 1;
    transform: none;
  }

  .nav-links a {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--line);
  }

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

  .hero { padding: 3.5rem 0 3rem; }
  .row { flex-direction: column; gap: 0.15rem; }
  .link-grid { grid-template-columns: repeat(2, 1fr); }
}

/* --- View Transitions (MPA) Customization ---------------------------------- */

@media (prefers-reduced-motion: no-preference) {
  /* Premium Depth/Scale Transition */
  ::view-transition-old(root) {
    animation: fade-out 0.25s cubic-bezier(0.4, 0, 0.2, 1) both,
               scale-down 0.25s cubic-bezier(0.4, 0, 0.2, 1) both;
  }
  ::view-transition-new(root) {
    animation: fade-in 0.35s cubic-bezier(0, 0, 0.2, 1) both,
               scale-up 0.35s cubic-bezier(0, 0, 0.2, 1) both;
  }

  /* Exclude the navigation header from the animation so it persists perfectly */
  .site-head {
    view-transition-name: site-header;
  }
  
  ::view-transition-old(site-header),
  ::view-transition-new(site-header) {
    animation: none;
    mix-blend-mode: normal;
  }
}

@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes fade-out {
  from { opacity: 1; }
  to { opacity: 0; }
}
@keyframes scale-down {
  from { transform: scale(1); }
  to { transform: scale(0.98); }
}
@keyframes scale-up {
  from { transform: scale(1.02); }
  to { transform: scale(1); }
}