/* ==========================================================================
   PORTFOLIO — Luca Bettani
   1. Tokens (modifica qui colori, font, raggi: tutto il sito li eredita)
   2. Base  3. Componenti riusabili  4. Sezioni  5. Responsive / a11y
   Per Tailwind: i token sotto mappano 1:1 su theme.extend (colors, fontFamily,
   borderRadius); le classi sono componenti, convertibili con @apply.
   ========================================================================== */

/* 1. TOKENS ---------------------------------------------------------------- */
:root {
  /* Palette */
  --c-ink: #0a0516;
  --c-night: #120a2b;
  --c-violet: #6a35e8;
  --c-orchid: #b06bff;
  --c-lilac: #d6c6ff;
  --c-text: #efeaff;
  --c-muted: #a99fc9;
  --c-line: rgba(214, 198, 255, .18);
  --particle-rgb: 190, 160, 255;           /* usato anche dal canvas (JS) */
  --grad-brand: linear-gradient(135deg, var(--c-violet), var(--c-orchid));

  /* Glass */
  --glass-bg: linear-gradient(160deg, rgba(255,255,255,.09), rgba(255,255,255,.03));
  --glass-border: rgba(255, 255, 255, .13);
  --glass-blur: 12px;
  --glass-shadow: 0 18px 50px -22px rgba(8, 2, 30, .9), inset 0 1px 0 rgba(255,255,255,.16);

  /* Tipografia */
  --font-display: "Bricolage Grotesque", "Segoe UI", system-ui, sans-serif;
  --font-body: "Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;

  /* Layout */
  --container: 1100px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --section-y: clamp(4.5rem, 9vw, 7.5rem);
  --radius-lg: 26px;
  --radius-sm: 12px;
  --ease: cubic-bezier(.22, .8, .24, 1);
}

/* 2. BASE ------------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; isolation: isolate; overflow-x: hidden;
  background: var(--c-ink); color: var(--c-text);
  font: 400 1.0625rem/1.65 var(--font-body);
}
h1, h2, h3, p, ul, ol, figure, blockquote { margin: 0; }
ul, ol { padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--c-lilac); outline-offset: 3px; }

/* Sfondo: gradienti + griglia da tavola tecnica + canvas particelle */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -3;
  background:
    radial-gradient(60rem 40rem at 85% -10%, rgba(106,53,232,.40), transparent 60%),
    radial-gradient(48rem 36rem at -10% 40%, rgba(176,107,255,.16), transparent 60%),
    radial-gradient(50rem 40rem at 70% 110%, rgba(70,30,160,.38), transparent 60%),
    linear-gradient(180deg, var(--c-night), var(--c-ink));
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.035) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse at 50% 30%, #000 20%, transparent 75%);
          mask-image: radial-gradient(ellipse at 50% 30%, #000 20%, transparent 75%);
}
#bg { position: fixed; inset: 0; z-index: -1; width: 100%; height: 100%; pointer-events: none; }

/* 3. COMPONENTI ------------------------------------------------------------ */
.container { width: min(100% - 2 * var(--gutter), var(--container)); margin-inline: auto; }
.section { padding-block: var(--section-y); scroll-margin-top: 1rem; }

.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(140%);
          backdrop-filter: blur(var(--glass-blur)) saturate(140%);
}

.card {
  padding: clamp(1.4rem, 3vw, 2rem); border-radius: var(--radius-lg);
  transition: transform .4s var(--ease), border-color .4s var(--ease), box-shadow .4s var(--ease);
}
.card:hover { transform: translateY(-4px); border-color: rgba(214,198,255,.38); }
.card__title { font: 600 1.1rem/1.3 var(--font-display); margin-bottom: .9rem; }

.section__head { margin-bottom: 2.5rem; max-width: 40rem; }
.section__title { font: 700 clamp(2.2rem, 5vw, 3.4rem)/1.05 var(--font-display); letter-spacing: -.03em; }
.section__lead { color: var(--c-muted); margin-top: .6rem; }

.btn {
  display: inline-flex; align-items: center; padding: .85rem 1.5rem; border-radius: var(--radius-sm);
  font: 600 .98rem var(--font-body); border: 1px solid transparent;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), background-position .5s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--grad-brand) 0 0 / 160% 100%; box-shadow: 0 10px 30px -10px var(--c-violet); }
.btn--primary:hover { background-position: 100% 0; box-shadow: 0 14px 36px -10px var(--c-orchid); }
.btn--ghost { background: rgba(255,255,255,.06); border-color: var(--glass-border); }
.btn--ghost:hover { background: rgba(255,255,255,.12); }

.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chips li {
  padding: .3rem .85rem; border-radius: 999px; font-size: .9rem;
  background: rgba(255,255,255,.06); border: 1px solid var(--glass-border);
  transition: background .3s, border-color .3s, color .3s;
}
.chips li:hover { background: rgba(176,107,255,.2); border-color: var(--c-orchid); color: #fff; }

/* Navbar */
.nav-wrap { position: fixed; inset: 14px 0 auto; z-index: 50; display: flex; justify-content: center; padding-inline: var(--gutter); pointer-events: none; }
.nav { pointer-events: auto; display: flex; align-items: center; gap: 1.25rem; padding: .4rem .4rem .4rem 1.25rem; border-radius: 999px; }
.nav__brand { font: 800 1.15rem var(--font-display); letter-spacing: -.02em; }
.nav__menu { display: flex; gap: .15rem; }
.nav__link { display: block; padding: .5rem 1rem; border-radius: 999px; font-size: .95rem; color: var(--c-muted); transition: color .3s, background .3s; }
.nav__link:hover { color: var(--c-text); }
.nav__link.is-active { color: #fff; background: rgba(255,255,255,.12); box-shadow: inset 0 0 0 1px var(--glass-border); }
.nav__toggle { display: none; width: 2.5rem; height: 2.5rem; border: 0; border-radius: 50%; background: rgba(255,255,255,.08); color: inherit; cursor: pointer; }
.nav__toggle span { display: block; width: 16px; height: 2px; margin: 4px auto; background: currentColor; transition: transform .3s var(--ease); }
.nav[data-open="true"] .nav__toggle span:first-child { transform: translateY(3px) rotate(45deg); }
.nav[data-open="true"] .nav__toggle span:last-child { transform: translateY(-3px) rotate(-45deg); }

/* 4. SEZIONI --------------------------------------------------------------- */
/* About / hero */
.section--about { padding-top: 7rem; }
.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr); gap: clamp(2rem, 6vw, 5rem); align-items: center; min-height: calc(100svh - 11rem); }
.hero__name { display: flex; flex-direction: column; font-family: var(--font-display); font-size: clamp(3.6rem, 12vw, 8.5rem); line-height: .9; letter-spacing: -.04em; }
.hero__line { display: block; overflow: hidden; padding-block: .03em; }
.hero__first, .hero__last { display: block; animation: rise 1s var(--ease) both; }
.hero__first { font-weight: 200; }
.hero__last { font-weight: 800; animation-delay: .12s; }
.hero__role { display: flex; align-items: center; gap: .75rem; margin-top: 1.5rem; font: 500 1.2rem var(--font-display); color: var(--c-lilac); }
.hero__role::before { content: ""; width: 44px; height: 2px; background: var(--c-line); box-shadow: 44px 0 0 -0px transparent; }
.hero__role::after { content: ""; order: -1; width: 8px; height: 8px; border: 1.5px solid var(--c-orchid); }
.hero__quote { margin-top: 1.25rem; max-width: 30ch; font: 300 clamp(1.3rem, 2.4vw, 1.6rem)/1.35 var(--font-display); color: var(--c-text); }
.hero__actions { display: flex; flex-wrap: wrap; gap: .75rem; margin-top: 2rem; }
.hero__quote, .hero__role, .hero__actions { animation: fade .9s .45s var(--ease) both; }

.hero__photo { position: relative; justify-self: center; width: min(100%, 340px); padding: 22px; animation: fade 1s .3s var(--ease) both; }
.hero__photo::before { content: ""; position: absolute; inset: 10% 0 0; z-index: -1; background: radial-gradient(closest-side, rgba(106,53,232,.55), transparent); filter: blur(30px); }
.photo-frame { position: relative; aspect-ratio: 4 / 5; padding: 10px; border-radius: 999px; }
.photo-frame img, .photo-frame__initials { position: absolute; inset: 10px; width: calc(100% - 20px); height: calc(100% - 20px); border-radius: 999px; object-fit: cover; }
.photo-frame__initials { display: grid; place-items: center; background: var(--grad-brand); font: 800 4rem var(--font-display); }
.photo-frame img { z-index: 1; }
.crop { position: absolute; width: 18px; height: 18px; border: 0 solid var(--c-lilac); opacity: .6; }
.crop--tl { top: 0; left: 0; border-width: 1px 0 0 1px; } .crop--tr { top: 0; right: 0; border-width: 1px 1px 0 0; }
.crop--bl { bottom: 0; left: 0; border-width: 0 0 1px 1px; } .crop--br { bottom: 0; right: 0; border-width: 0 1px 1px 0; }
.hero__dim { position: absolute; top: 22px; bottom: 22px; right: 0; width: 22px; display: grid; place-items: center;
  background: linear-gradient(var(--c-line), var(--c-line)) center / 1px 100% no-repeat; }
.hero__dim span { writing-mode: vertical-rl; transform: rotate(180deg); padding-block: .6rem; background: #130a2c; font-size: .72rem; letter-spacing: .06em; color: var(--c-muted); }

.about { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.25rem; margin-top: clamp(3rem, 7vw, 5rem); }
.about__bio { grid-column: span 7; } .about__skills { grid-column: span 5; }
.about__langs { grid-column: span 5; } .about__cert { grid-column: span 7; }
.about__bio p { color: var(--c-muted); } .about__bio p + p { margin-top: 1rem; }
.about__skills .chips + .card__title { margin-top: 1.4rem; }
.cert { display: flex; gap: 1rem; align-items: center; }
.cert__icon { flex: none; width: 3rem; height: 3rem; display: grid; place-items: center; border-radius: 14px; background: var(--grad-brand); }
.cert__meta { color: var(--c-muted); font-size: .95rem; }
.icon { width: 1.4rem; height: 1.4rem; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }

/* Experience */
.timeline { position: relative; display: grid; gap: 1.25rem; padding-left: 2.25rem; }
.timeline::before { content: ""; position: absolute; left: 6px; top: .6rem; bottom: .6rem; width: 2px; background: linear-gradient(var(--c-orchid), var(--c-line)); }
.timeline__item { position: relative; }
.timeline__dot { position: absolute; left: -2.25rem; top: 2.1rem; width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--c-orchid); background: var(--c-ink); transition: background .3s, box-shadow .3s; }
.timeline__item:hover .timeline__dot { background: var(--c-orchid); box-shadow: 0 0 14px var(--c-orchid); }
.job__head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .25rem 1rem; align-items: baseline; }
.job__company { font: 700 1.4rem var(--font-display); letter-spacing: -.01em; }
.job__period { color: var(--c-muted); font-size: .95rem; }
.job__role { color: var(--c-lilac); font-weight: 500; margin: .15rem 0 1rem; }
.job__list li { position: relative; padding-left: 1.3rem; color: var(--c-muted); }
.job__list li + li { margin-top: .35rem; }
.job__list li::before { content: ""; position: absolute; left: 0; top: .7em; width: 6px; height: 6px; border: 1px solid var(--c-orchid); }

/* Sottosezione Formazione: stessa timeline, ma più sottile e senza card */
.subsection__title { margin: clamp(3rem, 6vw, 4.5rem) 0 1.25rem; font: 600 1.6rem/1.2 var(--font-display); letter-spacing: -.02em; }
.timeline--compact { gap: 1.1rem; }
.timeline--compact::before { left: 6px; width: 1px; background: var(--c-line); }
.timeline--compact .timeline__dot { top: .5rem; left: calc(-2.25rem + 3px); width: 8px; height: 8px; border-width: 1.5px; }
.edu-item__head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: .1rem 1rem; }
.edu-item__school { font: 600 1.1rem var(--font-display); }
.edu-item__period { font-size: .9rem; color: var(--c-muted); }
.edu-item__degree { color: var(--c-muted); font-size: .95rem; }
.edu-item__grade { color: var(--c-lilac); font-size: .88rem; }

/* Projects: flashcard. Le facce NON usano backdrop-filter (si rompe con il 3D). */
.projects { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1.25rem; }
.flip { position: relative; perspective: 1200px; min-height: 310px; transition: transform .4s var(--ease); }
.flip:hover { transform: translateY(-6px); }
.flip__inner { position: absolute; inset: 0; transform-style: preserve-3d; transition: transform .75s var(--ease); }
.flip.is-flipped .flip__inner { transform: rotateY(180deg); }
.flip__face {
  position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: space-between; gap: 1rem;
  padding: 1.6rem; border-radius: var(--radius-lg); backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: linear-gradient(160deg, rgba(60,32,130,.55), rgba(24,12,56,.85));
  border: 1px solid var(--glass-border); box-shadow: var(--glass-shadow);
}
.flip__face--back { transform: rotateY(180deg); background: linear-gradient(160deg, rgba(106,53,232,.45), rgba(24,12,56,.9)); justify-content: flex-start; }
.flip__toggle { position: absolute; inset: 0; z-index: 2; border: 0; border-radius: var(--radius-lg); background: none; cursor: pointer; }
.flip__sector { align-self: flex-start; padding: .25rem .8rem; border-radius: 999px; font-size: .85rem; background: rgba(255,255,255,.08); border: 1px solid var(--glass-border); }
.flip__title { font: 600 1.45rem/1.15 var(--font-display); letter-spacing: -.01em; }
.flip__hint { font-size: .85rem; color: var(--c-muted); }
.flip__face p { color: var(--c-text); font-size: .98rem; }
.flip__face .chips { margin-top: auto; }

/* Rating complessità: cambia solo --rating (da 1 a 5) nell'HTML */
.rating { display: grid; gap: .4rem; font-size: .85rem; color: var(--c-muted); }
.rating__bar { height: 6px; background: linear-gradient(90deg, var(--c-orchid) calc(var(--rating) * 20%), rgba(255,255,255,.14) 0);
  -webkit-mask: repeating-linear-gradient(90deg, #000 0 calc(20% - 4px), transparent 0 20%);
          mask: repeating-linear-gradient(90deg, #000 0 calc(20% - 4px), transparent 0 20%); }

/* Contact */
.contact { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(1.5rem, 5vw, 4rem); padding: clamp(1.75rem, 5vw, 3.5rem); border-radius: 32px; align-items: center; }
.contact__list { display: grid; gap: .75rem; }
.contact__item { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.2rem; border-radius: 18px; background: rgba(255,255,255,.05); border: 1px solid var(--glass-border);
  transition: transform .35s var(--ease), background .35s, border-color .35s; }
a.contact__item:hover { transform: translateX(6px); background: rgba(176,107,255,.16); border-color: var(--c-orchid); }
.contact__icon { flex: none; width: 2.6rem; height: 2.6rem; display: grid; place-items: center; border-radius: 12px; background: var(--grad-brand); }
.contact__label { display: block; font-size: .85rem; color: var(--c-muted); line-height: 1.3; }
.contact__value { overflow-wrap: anywhere; font-weight: 500; }
.footer { padding: 2rem var(--gutter) 3rem; text-align: center; color: var(--c-muted); font-size: .9rem; }

/* Animazioni (solo ingresso hero) */
@keyframes rise { from { transform: translateY(105%); } }
@keyframes fade { from { opacity: 0; transform: translateY(14px); } }

/* Fallback: senza backdrop-filter le card restano leggibili */
@supports not ((backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px))) {
  .glass { background: rgba(24, 12, 56, .82); }
}

/* 5. RESPONSIVE / A11Y ----------------------------------------------------- */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .hero__photo { order: -1; width: 230px; }
  .about > * { grid-column: 1 / -1 !important; }
  .contact { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  :root { --glass-blur: 8px; }   /* blur più leggero su mobile */
  .nav { width: 100%; flex-wrap: wrap; justify-content: space-between; border-radius: 26px; padding-block: .4rem; }
  .nav__toggle { display: block; }
  .nav__menu { display: none; width: 100%; flex-direction: column; padding-bottom: .5rem; }
  .nav[data-open="true"] .nav__menu { display: flex; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition-duration: .01ms !important; }
}