:root {
  --color-bg: #ffffff;
  --color-text: #000000;
  --color-muted: #555555;
  --color-muted-light: #444444;
  --color-border: rgba(0, 0, 0, 0.18);
  --color-accent: #000000;

  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --transition-default: 0.25s ease;
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  --radius: 0.125rem;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 3rem;
  --spacing-xl: 6rem;

  --max-width-content: 1200px;
  --max-width-narrow: 40rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #121212;
    --color-text: #e6e6e6;
    --color-muted: #c7c7c7;
    --color-muted-light: #d0d0d0;
    --color-border: rgba(255, 255, 255, 0.22);
    --color-accent: #ffffff;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--spacing-xl);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 100%;
  line-height: 1.6;
}

body {
  font-family: var(--font-body);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "kern", "liga", "calt";
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
}

img,
picture,
video,
svg {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px dashed var(--color-accent);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: var(--spacing-xs) var(--spacing-sm);
  background: var(--color-accent);
  color: var(--color-bg);
  text-decoration: none;
  z-index: 9999;
}
.skip-link:focus-visible {
  left: var(--spacing-sm);
  top: var(--spacing-sm);
}

/* TIPOGRAFIA */
h1, h2, h3, h4 {
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.4rem, 7vw, 3.8rem);
  letter-spacing: 0.04em;
}

h2 {
  font-size: 1.05rem;
  letter-spacing: 0.23em;
  text-transform: uppercase;
  color: var(--color-muted-light);
}

p {
  margin: 0 0 var(--spacing-md);
  color: var(--color-muted);
}

.container {
  width: 90%;
  max-width: var(--max-width-content);
  margin-inline: auto;
}

.narrow {
  max-width: var(--max-width-narrow);
  margin-inline: auto;
}

/* HERO */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-xl) var(--spacing-sm) var(--spacing-lg);
}

.hero-inner {
  text-align: center;
}

.hero-tagline {
  margin-top: var(--spacing-sm);
  font-size: 0.95rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--color-muted-light);
}

/* NAV */
.site-nav {
  margin-top: var(--spacing-lg);
  font-size: 0.85rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}

.site-nav a {
  color: var(--color-muted-light);
  transition: color var(--transition-default), opacity var(--transition-default);
}

.site-nav a + a::before {
  content: " · ";
  opacity: 0.4;
  padding: 0 0.7ch;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-accent);
  opacity: 1;
}

/* SEZIONI */
.section {
  padding: var(--spacing-xl) var(--spacing-sm) var(--spacing-lg);
  text-align: center;
}

.section-header {
  text-align: left;
  max-width: var(--max-width-narrow);
  margin: 0 auto;
}

.subtitle {
  font-size: 1.05rem;
  font-style: italic;
  color: var(--color-muted);
  margin-bottom: 3.5rem;
}

/* WORKS */
.works-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2.5rem;
  margin-top: var(--spacing-lg);
}

.work-item {
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 3 / 4;
}

.work-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform var(--transition-slow), filter var(--transition-slow);
  will-change: transform, filter;
}

/* grayscale solo su desktop con hover */
@media (hover: hover) and (pointer: fine) {
  .work-item img {
    filter: grayscale(100%);
  }

  .work-item:hover img,
  .work-item:focus-within img {
    transform: scale(1.04);
    filter: grayscale(0%);
  }
}

/* LAB, ABOUT, CONTACT */
#lab p,
#about p,
#contact p {
  text-align: left;
  margin-left: auto;
  margin-right: auto;
}

/* FORM */
.contact-form {
  margin-top: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
  text-align: left;
}

.contact-form label {
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted-light);
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--color-border);
  padding: 0.7rem 0;
  font-size: 1rem;
  background: transparent;
  color: var(--color-text);
}

.contact-form input::placeholder,
.contact-form textarea::placeholder {
  color: var(--color-muted-light);
}

.contact-form input:focus-visible,
.contact-form textarea:focus-visible {
  outline: none;
  border-color: var(--color-accent);
}

.contact-form button {
  align-self: flex-start;
  background: var(--color-accent);
  color: var(--color-bg);
  border: none;
  padding: 0.9rem 2.2rem;
  font-size: 0.85rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background var(--transition-default), color var(--transition-default);
  border-radius: var(--radius);
}

.contact-form button:hover,
.contact-form button:focus-visible {
  background: var(--color-muted-light);
  color: var(--color-bg);
}

/* FOOTER */
.footer {
  padding: var(--spacing-lg) var(--spacing-sm) var(--spacing-xl);
  font-size: 0.9rem;
  color: var(--color-muted-light);
  text-align: center;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  .hero {
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
  }

  .site-nav {
    margin-top: var(--spacing-md);
    letter-spacing: 0.2em;
  }

  .section {
    padding: var(--spacing-lg) var(--spacing-sm) var(--spacing-md);
  }

  .works-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  h2 {
    font-size: 0.95rem;
  }
}