/*
 * Francesco Massafra — personal site stylesheet.
 * Modern light redesign, single-page layout.
 */

:root {
  --color-accent: #4f46e5;
  --color-accent-hover: #3730a3;
  --color-text: #1f2937;
  --color-text-muted: #6b7280;
  --color-text-faint: #9ca3af;
  --color-surface: #ffffff;
  --color-surface-alt: #f9fafb;
  --color-border: #e5e7eb;
  --content-width: 760px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-surface-alt);
  line-height: 1.65;
}

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

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

/* Top navigation */
.topnav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
}

.topnav_inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 12px 24px;
}

.topnav_brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
}

.topnav_brand:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.topnav_links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.topnav_links a {
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.topnav_links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

/* Page content */
main {
  max-width: var(--content-width);
  margin-inline: auto;
  padding: 0 24px 48px;
}

section {
  padding-top: 56px;
}

h2 {
  margin: 0 0 16px;
  font-size: 1.6rem;
  letter-spacing: -0.01em;
}

h3 {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.4;
}

/* Hero */
.hero {
  padding-top: 72px;
  text-align: center;
}

.hero_initials,
.hero_photo {
  width: 128px;
  height: 128px;
  margin: 0 auto 24px;
  border-radius: 50%;
}

.hero_initials {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--color-surface);
  background: linear-gradient(135deg, var(--color-accent), #818cf8);
}

.hero_photo {
  display: block;
  object-fit: cover;
}

.hero h1 {
  margin: 0;
  font-size: 2.4rem;
  letter-spacing: -0.02em;
}

.hero_role {
  margin: 8px 0 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-accent);
}

.hero_tagline {
  max-width: 560px;
  margin: 16px auto 0;
  color: var(--color-text-muted);
}

.hero_tagline strong {
  color: var(--color-accent);
  font-weight: 600;
}

.hero_links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 28px;
}

.hero_links a {
  padding: 8px 18px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.hero_links a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  text-decoration: none;
}

/* Acceptance badge */
.badge {
  display: inline-block;
  margin-top: 10px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--color-accent);
  background: rgba(79, 70, 229, 0.08);
  border: 1px solid rgba(79, 70, 229, 0.25);
  border-radius: 999px;
}

.badge:hover {
  text-decoration: none;
  background: rgba(79, 70, 229, 0.14);
  color: var(--color-accent-hover);
}

/* Cards (research projects, publications) */
.card {
  margin-top: 20px;
  padding: 20px 24px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 12px;
}

.card p {
  margin: 12px 0 0;
  color: var(--color-text-muted);
}

.card_head {
  display: flex;
  gap: 16px;
  align-items: baseline;
  justify-content: space-between;
}

.card_year {
  flex-shrink: 0;
  font-size: 0.9rem;
  color: var(--color-text-faint);
}

.card_link {
  display: inline-block;
  margin-top: 12px;
  margin-right: 16px;
  font-weight: 500;
}

.card_link-muted {
  color: var(--color-text-faint);
  cursor: default;
}

.card_link-muted:hover {
  text-decoration: none;
  color: var(--color-text-faint);
}

.card_pub {
  border-left: 3px solid var(--color-accent);
}

/* Experience / education entries */
.job {
  margin-top: 28px;
}

.job_head {
  display: flex;
  gap: 16px;
  align-items: baseline;
  justify-content: space-between;
}

.job_dates {
  flex-shrink: 0;
  font-size: 0.9rem;
  color: var(--color-text-faint);
}

.job_meta {
  margin: 4px 0 0;
  font-size: 0.95rem;
  color: var(--color-text-faint);
}

.job p:last-child {
  margin-bottom: 0;
  color: var(--color-text-muted);
}

/* Skill chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chips span {
  padding: 6px 14px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
}

/* Footer */
.footer {
  padding: 32px 24px;
  font-size: 0.9rem;
  color: var(--color-text-faint);
  text-align: center;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.footer p {
  margin: 0;
}

.footer_joke {
  margin-top: 6px !important;
  font-size: 0.8rem;
  opacity: 0.75;
}

/* Mobile */
@media screen and (max-width: 640px) {
  .hero {
    padding-top: 48px;
  }

  .hero h1 {
    font-size: 1.9rem;
  }

  .topnav_links {
    gap: 14px;
  }

  .card_head,
  .job_head {
    flex-direction: column;
    gap: 2px;
  }
}

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

  .hero_links a {
    transition: none;
  }
}