/* THENERDSMITH — palette Nataku (design-factory/branding/thenerdsmith-site.md) su fondo acciaio scuro: blu laser per azioni,
   arancio scintilla per hover. Font di sistema (niente font esterni per il GDPR): IBM Plex solo se installato. */
:root {
  --bg: #15161f; --card: #1f2130; --line: #2b2d42; --fg: #edf2f4; --dim: #9aa1b5; --laser: #4361ee; --laser-text: #8da0ff; --spark: #f4a261; --ok: #3ccf91; --err: #ff6b6b;
  --text: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 400 16px/1.6 var(--text); }
a { color: var(--fg); }
h1, h2, h3 { line-height: 1.15; }
.skip { position: absolute; left: -999px; } .skip:focus { left: 8px; top: 8px; background: var(--card); padding: 8px; z-index: 9; }

.top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap;
  padding: 10px 16px; background: rgba(21,22,31,.94); border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.2rem; letter-spacing: .12em; text-decoration: none; }
.mark { flex: none; }
.wm span { color: var(--laser-text); }
nav { display: flex; gap: 18px; }
nav a { text-decoration: none; color: var(--dim); font-weight: 600; font-size: .95rem; }
nav a:hover, nav a[aria-current] { color: var(--fg); }

main { max-width: 1100px; margin: 0 auto; padding: 0 16px 56px; outline: none; }
/* Hero: incudine grande con alone blu laser e scintilla arancio, come il marchio di Nataku */
.hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 32px; align-items: center; padding: 56px 0 24px; }
.eyebrow { margin: 0 0 12px; color: var(--spark); font-weight: 700; font-size: .8rem; letter-spacing: .16em; text-transform: uppercase; }
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.8rem); margin: 0 0 18px; letter-spacing: -.01em; }
.hero h1 span { background: linear-gradient(90deg, var(--laser-text), var(--spark)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--dim); max-width: 60ch; margin: 0 0 8px; font-size: 1.1rem; }
.hero .actions { margin: 26px 0 18px; }
.badges { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.badges li { font-size: .8rem; color: var(--dim); border: 1px solid var(--line); border-radius: 99px; padding: 3px 12px; }
.badges li::before { content: "✓ "; color: var(--ok); }
.hero-art { position: relative; display: grid; place-items: center; aspect-ratio: 1; max-width: 380px; width: 100%; justify-self: center;
  border-radius: 50%; background: radial-gradient(circle at 50% 48%, rgba(244,162,97,.28), rgba(67,97,238,.18) 38%, transparent 70%); }
.hero-mark { width: 74%; height: auto; filter: drop-shadow(0 0 14px rgba(67,97,238,.55)); animation: glow 3.2s ease-in-out infinite; }
@keyframes glow { 50% { filter: drop-shadow(0 0 26px rgba(244,162,97,.6)); } }
@media (prefers-reduced-motion: reduce) { .hero-mark { animation: none; } }
@media (max-width: 760px) { .hero { grid-template-columns: minmax(0, 1fr); padding-top: 32px; } .hero-art { max-width: 220px; order: -1; } }
.btn-lg { padding: 13px 28px; font-size: 1.05rem; }

/* Sezioni della landing */
.section { padding: 48px 0 0; }
.section-title { font-size: clamp(1.5rem, 4vw, 2.1rem); margin: 0 0 22px; }
.wm-inline { letter-spacing: .08em; } .wm-inline span { color: var(--laser-text); }
.center { text-align: center; margin-top: 28px; }
/* Hub: un gruppo per feature di Nataku, una card per pagina strumento */
.hub { scroll-margin-top: 64px; }
.hub > .lead { margin-bottom: 24px; }
.group { background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 22px 20px; margin: 0 0 16px; }
.group-head { display: flex; gap: 16px; align-items: flex-start; }
.group-head h3 { margin: 4px 0 6px; font-size: 1.2rem; }
.group-head p { margin: 0; color: var(--dim); font-size: .95rem; max-width: 70ch; }
.ico { flex: none; display: grid; place-items: center; width: 46px; height: 46px; border-radius: 12px; background: rgba(67,97,238,.16); font-size: 1.4rem; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; margin-top: 18px; }
.tool-card { display: flex; flex-direction: column; gap: 4px; padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--bg);
  text-decoration: none; transition: border-color .2s, transform .2s; }
.tool-card b { color: var(--fg); }
.tool-card span { color: var(--dim); font-size: .88rem; }
.tool-card .go { margin-top: auto; padding-top: 6px; color: var(--laser-text); font-weight: 700; }
.tool-card:hover { border-color: var(--laser); transform: translateY(-2px); }
.tool-card:hover .go { color: var(--spark); }
.soon-group { opacity: .75; }

/* Pagine strumento */
.tool-head { padding: 28px 0 0; }
.tool-head h1 { font-size: clamp(1.8rem, 5vw, 2.6rem); margin: 0 0 10px; }
.crumbs { margin: 0 0 10px; color: var(--dim); font-size: .85rem; }
.crumbs a { color: var(--dim); }
.others { display: flex; flex-wrap: wrap; gap: 8px; list-style: none; padding: 0; margin: 0; }
.others a { display: inline-block; padding: 6px 14px; border: 1px solid var(--line); border-radius: 99px; text-decoration: none; font-size: .9rem; }
.others a:hover { border-color: var(--spark); }

/* Tooltip dei parametri (testi di Carmela in describe()): "?" con popup al passaggio o al tocco */
.params label { position: relative; }
.tip { display: inline-grid; place-items: center; width: 17px; height: 17px; border-radius: 50%; border: 1px solid var(--dim); color: var(--dim);
  font-size: .7rem; font-weight: 700; line-height: 1; cursor: help; vertical-align: 1px; }
.tip:hover, .tip:focus { color: var(--fg); border-color: var(--spark); outline: none; }
.tip::after { content: attr(data-tip); position: absolute; left: 0; right: 0; top: calc(100% + 6px); z-index: 4; padding: 8px 10px; border-radius: 8px;
  background: #2b2d42; border: 1px solid var(--spark); color: var(--fg); font-size: .8rem; font-weight: 400; line-height: 1.4; text-align: left;
  box-shadow: 0 8px 24px rgba(0,0,0,.4); opacity: 0; visibility: hidden; transition: opacity .15s; pointer-events: none; }
.tip:hover::after, .tip:focus::after { opacity: 1; visibility: visible; }
.soon { display: inline-block; vertical-align: middle; margin-left: 6px; font-size: .65rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: #2b2d42; background: var(--spark); border-radius: 99px; padding: 2px 8px; }
.tool { scroll-margin-top: 64px; }
.home-tool + .hero { padding-top: 40px; }
.tool .panel { border-color: var(--laser); box-shadow: 0 0 0 1px rgba(67,97,238,.25), 0 10px 40px rgba(67,97,238,.12); }
.cta { margin: 56px 0 0; padding: 44px 20px; text-align: center; border-radius: 16px; border: 1px solid var(--line);
  background: radial-gradient(ellipse at 50% 0%, rgba(244,162,97,.22), transparent 60%), linear-gradient(180deg, #23263a, var(--card)); }
.cta h2 { margin: 0 0 8px; font-size: clamp(1.6rem, 4.5vw, 2.4rem); }
.cta p { color: var(--dim); margin: 0 0 20px; }
.cta p:last-child { margin: 0; }
.note { color: var(--dim); font-size: .9rem; max-width: 70ch; }
.block { padding: 40px 0 0; max-width: 75ch; }

/* Spazi pubblicitari: altezza riservata per non far saltare la pagina (CLS) */
.ad { margin: 24px 0; min-height: 100px; text-align: center; }
.ad::before { content: "Pubblicità"; display: block; color: var(--dim); font-size: .7rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 4px; }

/* Strumento */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.tabs { display: flex; flex-wrap: wrap; gap: 6px; margin: 0 0 16px; }
.tabs button { background: transparent; color: var(--dim); border: 1px solid var(--line); border-radius: 99px; padding: 6px 14px; font: inherit; font-size: .9rem; cursor: pointer; }
.tabs button:hover { color: var(--fg); border-color: var(--spark); }
.tabs button[aria-selected="true"] { color: #fff; background: var(--laser); border-color: var(--laser); }
.home-tool { padding-top: 16px; }
.panel-sub { display: block; margin-top: 2px; font-size: .85rem; font-weight: 400; color: var(--spark); }
.status { font-size: .9rem; color: var(--dim); margin: 0 0 12px; }
.status.ok { color: var(--ok); } .status.err { color: var(--err); }
.drop { display: block; border: 2px dashed var(--line); border-radius: 10px; padding: 22px; text-align: center; color: var(--dim); cursor: pointer; margin: 0 0 16px; }
.drop.over { border-color: var(--laser); color: var(--fg); }
.drop input { display: block; margin: 10px auto 0; max-width: 100%; }
.params { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 12px; margin: 0 0 16px; }
.params label { display: flex; flex-direction: column; gap: 4px; font-size: .85rem; color: var(--dim); }
.params label.check { flex-direction: row; align-items: center; gap: 8px; }
.params input, .params select { background: var(--bg); color: var(--fg); border: 1px solid var(--line); border-radius: 6px; padding: 7px 8px; font: inherit; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn:hover:not(:disabled) { background: var(--spark); color: #2b2d42; }
.btn { background: var(--laser); color: #fff; border: 0; border-radius: 99px; padding: 10px 22px; font: inherit; font-weight: 700; cursor: pointer; }
.btn.ghost { background: transparent; border: 1px solid var(--line); color: var(--fg); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.result { margin-top: 18px; }
.result[hidden] { display: none; }
.preview { width: 100%; max-height: 420px; object-fit: contain; background: #fff; border-radius: 8px; }
.stats { font-family: var(--mono); font-size: .85rem; color: var(--dim); white-space: pre-wrap; }
.warn { color: #ffc65c; font-size: .9rem; }

.legal h2 { font-size: 1.8rem; } .legal h3 { margin-top: 28px; }
.draft { background: #3a2a12; border: 1px solid #ffc65c; color: #ffc65c; padding: 8px 12px; border-radius: 8px; }
footer { border-top: 1px solid var(--line); padding: 20px 16px; color: var(--dim); font-size: .85rem; text-align: center; }
footer a { color: var(--dim); margin: 0 8px; }
.linkbtn { background: none; border: 0; padding: 0; color: var(--dim); font: inherit; text-decoration: underline; cursor: pointer; margin: 0 8px; }
.panel-title { margin: 0 0 8px; font-size: 1.2rem; }
.why { border-collapse: collapse; width: 100%; }
.why th, .why td { text-align: left; vertical-align: top; padding: 10px 12px 10px 0; border-bottom: 1px solid var(--line); }
.why th { white-space: nowrap; padding-right: 20px; }
.section .why { background: var(--card); border: 1px solid var(--line); border-radius: 14px; border-collapse: separate; border-spacing: 0; overflow: hidden; }
.section .why th, .section .why td { padding: 16px 20px; }
.section .why tr:last-child th, .section .why tr:last-child td { border-bottom: 0; }
.section .why th { color: var(--laser-text); border-left: 3px solid var(--spark); }
.section .why td { color: var(--dim); }
@media (max-width: 560px) { .why th, .why td { display: block; padding: 6px 0; } .why td { color: var(--dim); }
  .section .why th { padding: 14px 16px 2px; border-bottom: 0; white-space: normal; } .section .why td { padding: 0 16px 14px; } }
textarea { background: var(--bg); color: var(--fg); border: 1px solid var(--line); border-radius: 6px; padding: 7px 8px; font: inherit; font-family: var(--mono); }
details summary { cursor: pointer; color: var(--dim); margin-bottom: 8px; }
a.btn { display: inline-block; text-decoration: none; }
.warning-box { background: #3a2412; border: 1px solid var(--spark); border-radius: 8px; padding: 4px 14px; margin: 12px 0; }
code { font-family: var(--mono); font-size: .9em; background: var(--card); padding: 1px 5px; border-radius: 4px; }
.btn.ghost:hover { background: transparent; color: var(--spark); border-color: var(--spark); }
a:hover { color: var(--spark); }
footer p { max-width: 65ch; margin: 8px auto; }
.lic { margin: 0 0 20px; } .lic h3 { margin-bottom: 4px; }
.lic pre { white-space: pre-wrap; font-size: .8rem; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 12px; max-height: 420px; overflow: auto; }