:root {
  --paper: #E7ECEF; --card: #F6F8F9; --ink: #16263F; --ink-soft: #55627A; --line: #C5CED6;
  --lesson: #E8B93B; --video: #2E9486; --audio: #DD5C6E; --all: #7B6BD6;
  --ok: #1F7A5C; --bad: #B3261E;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--paper); color: var(--ink);
  font-family: "Bricolage Grotesque", system-ui, "Segoe UI", Roboto, sans-serif;
  font-size: 17px; line-height: 1.4;
  padding: max(20px, env(safe-area-inset-top)) 16px max(28px, env(safe-area-inset-bottom));
  min-height: 100dvh;
}
main { max-width: 480px; margin: 0 auto; }
[hidden] { display: none !important; }
h1 { font-size: 30px; line-height: 1.05; font-weight: 800; letter-spacing: -0.02em; margin: 0 0 6px; }
h2 { font-size: 19px; font-weight: 600; margin: 34px 0 10px; }
p { margin: 0 0 12px; }
.soft { color: var(--ink-soft); }
:focus-visible { outline: 3px solid var(--ink); outline-offset: 2px; }

.clip {
  background: var(--card); border: 1.5px solid var(--ink); border-radius: 14px;
  padding: 12px 14px; margin: 14px 0 18px;
}
.clip .host { font-weight: 600; }
.clip .ttl { overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.clip .lnk { font-size: 14px; color: var(--ink-soft); overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 1; -webkit-box-orient: vertical; overflow: hidden; }

label { display: block; font-weight: 600; margin: 0 0 6px; }
input, textarea {
  width: 100%; font: inherit; color: var(--ink); background: var(--card);
  border: 1.5px solid var(--line); border-radius: 12px; padding: 12px 14px;
}
textarea { resize: vertical; min-height: 52px; }
input:focus, textarea:focus { border-color: var(--ink); outline: none; }

/* Lo scaffale: quattro dorsi, uno per scopo. È l'unico elemento "forte" della pagina. */
.shelf { display: grid; gap: 8px; margin: 18px 0 0; }
.spine {
  appearance: none; border: 0; text-align: left; font: inherit; color: var(--ink); cursor: pointer;
  display: grid; grid-template-columns: 14px 1fr; gap: 14px; align-items: stretch;
  background: var(--card); border-radius: 14px; padding: 0; min-height: 68px; overflow: hidden;
  box-shadow: inset 0 0 0 1.5px var(--line);
  transition: transform .12s ease, box-shadow .12s ease;
}
.spine::before { content: ""; background: var(--c); }
.spine > span { padding: 12px 14px 12px 0; display: block; }
.spine b { display: block; font-size: 20px; font-weight: 800; letter-spacing: -0.01em; }
.spine small { display: block; font-size: 14.5px; color: var(--ink-soft); }
.spine:active { transform: scale(.985); }
.spine[aria-pressed="true"] { background: var(--c); box-shadow: inset 0 0 0 2px var(--ink); }
.spine[aria-pressed="true"] small { color: var(--ink); }
.spine[disabled] { opacity: .55; }
.spine.lesson { --c: var(--lesson); } .spine.video { --c: var(--video); }
.spine.audio { --c: var(--audio); } .spine.all { --c: var(--all); }

.msg { margin: 16px 0 0; padding: 12px 14px; border-radius: 12px; font-weight: 600; }
.msg.ok { background: #D5EDE2; color: var(--ok); }
.msg.bad { background: #F7DAD7; color: var(--bad); }

.btn {
  appearance: none; font: inherit; font-weight: 600; cursor: pointer; min-height: 48px;
  background: var(--ink); color: #fff; border: 0; border-radius: 12px; padding: 12px 18px; margin-top: 10px;
}
.btn.ghost { background: transparent; color: var(--ink); box-shadow: inset 0 0 0 1.5px var(--ink); }

.list { list-style: none; margin: 0; padding: 0; border-top: 1.5px solid var(--ink); }
.list li { display: grid; grid-template-columns: 8px 1fr auto; gap: 12px; align-items: center; padding: 12px 0; border-bottom: 1px solid var(--line); }
.list .dot { width: 8px; align-self: stretch; border-radius: 4px; background: var(--c); }
.list .t { overflow-wrap: anywhere; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.list .m { font-size: 14px; color: var(--ink-soft); }
.list .m.err { color: var(--bad); }
.list button { appearance: none; border: 0; background: none; font: inherit; font-size: 14px; color: var(--ink-soft); text-decoration: underline; min-width: 44px; min-height: 44px; cursor: pointer; }
@media (prefers-reduced-motion: reduce) { .spine { transition: none; } }
.opt { font-weight: 400; }