:root {
  --cream: #F5F9FD;
  --cream-2: #E8F1FA;
  --plum: #0F2E5C;
  --plum-soft: #5A7090;
  --accent: #0EA5F8;
  --accent-dark: #00377D;
  --line: #DCE6F2;
  --radius: 12px;
  --shadow: 0 10px 24px -10px rgba(15, 46, 92, .35), 0 2px 6px rgba(15, 46, 92, .08);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.55 "Poppins", system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--plum);
  background: var(--cream);
  min-height: 100vh;
}
h1, h2, .logo { font-family: "Poppins", system-ui, sans-serif; font-weight: 800; letter-spacing: -.02em; }
a { color: var(--accent); }
:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 55%, transparent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Bottoni */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  font: 600 .92rem/1 "Poppins", system-ui, sans-serif;
  padding: 11px 14px; border-radius: 999px; cursor: pointer; text-decoration: none; text-align: center;
  border: 1.5px solid var(--accent); background: var(--accent); color: #fff;
  transition: background .15s, color .15s;
}
.btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { background: color-mix(in srgb, var(--accent) 10%, transparent); }
.btn.big { width: 100%; padding: 16px; font-size: 1.05rem; border-radius: 999px; }
.linklike { background: none; border: 0; padding: 0; font: inherit; font-weight: 600; color: var(--plum); cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }

/* Login */
#login { min-height: 100vh; display: grid; place-items: center; padding: 24px 16px; }
.card {
  width: 100%; max-width: 420px; background: #fff; border: 1px solid var(--line);
  border-radius: 20px; padding: 36px 28px 30px; text-align: center;
  box-shadow: 0 24px 48px -28px rgba(15, 46, 92, .35);
}
.logo { font-size: 1.9rem; margin: 0 0 4px; background: linear-gradient(90deg, #00377D, #0EA5F8); -webkit-background-clip: text; background-clip: text; color: transparent; }
.card .sub { margin: 0 0 24px; color: var(--plum-soft); }
#login-form { display: grid; gap: 12px; }
#email {
  width: 100%; font: inherit; font-size: 1.1rem; padding: 16px; color: var(--plum);
  background: var(--cream); border: 1.5px solid var(--line); border-radius: 12px;
}
#email::placeholder { color: #8FA3BD; }
#email:focus { outline: none; border-color: var(--accent); background: #fff; }
#login-error { margin: 14px 0 0; color: #B3261E; font-size: .92rem; }
.fine { margin: 18px 0 0; font-size: .85rem; color: var(--plum-soft); }

/* Libreria */
.topbar {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 14px 16px; background: #fff; border-bottom: 1px solid var(--line);
}
.topbar .logo { font-size: 1.2rem; margin: 0; }
.topbar nav { display: flex; gap: 16px; align-items: center; font-size: .92rem; }
.topbar nav a { color: var(--plum); font-weight: 600; text-decoration: none; }
.topbar nav a:hover { color: var(--accent); }
main { max-width: 1040px; margin: 0 auto; padding: 28px 16px 64px; }
.head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.head h1 { font-size: clamp(1.6rem, 5vw, 2.2rem); line-height: 1.15; margin: 0; }
.head p { margin: 4px 0 0; color: var(--plum-soft); }
.search { position: relative; width: 100%; max-width: 320px; }
.search input {
  width: 100%; font: inherit; padding: 12px 14px 12px 40px; color: var(--plum);
  background: #fff; border: 1.5px solid var(--line); border-radius: 12px;
}
.search input:focus { outline: none; border-color: var(--accent); }
.search svg { position: absolute; left: 13px; top: 50%; translate: 0 -50%; color: var(--plum-soft); }
@media (max-width: 600px) { .search { max-width: none; } }

.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 16px; }
@media (min-width: 760px) { .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 28px 22px; } }

.book { display: flex; flex-direction: column; gap: 10px; }
.cover-wrap { position: relative; aspect-ratio: 3 / 4; border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); background: var(--cream-2); }
.cover { width: 100%; height: 100%; object-fit: cover; display: block; }
.cover-fallback { width: 100%; height: 100%; display: grid; place-items: center; color: var(--plum-soft); background: linear-gradient(145deg, var(--cream-2), #D6E6F5); }
.book.locked .cover, .book.locked .cover-fallback { filter: grayscale(1) contrast(.92); opacity: .75; }
.lock {
  position: absolute; top: 10px; right: 10px; width: 34px; height: 34px; border-radius: 50%;
  display: grid; place-items: center; background: rgba(15, 46, 92, .82); color: #fff;
}
.book h2 { font-family: "Poppins", system-ui, sans-serif; font-size: .95rem; font-weight: 700; line-height: 1.3; margin: 0; letter-spacing: 0;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.actions { display: flex; gap: 8px; margin-top: auto; }
.actions .btn { flex: 1; padding: 10px 6px; }

/* Skeleton */
.sk { background: linear-gradient(100deg, var(--cream-2) 30%, #F3F8FD 50%, var(--cream-2) 70%); background-size: 200% 100%; animation: sk 1.3s linear infinite; border-radius: var(--radius); }
.sk.cover-sk { aspect-ratio: 3 / 4; }
.sk.line { height: 14px; border-radius: 7px; }
.sk.btn-sk { height: 38px; border-radius: 999px; }
@keyframes sk { to { background-position: -200% 0; } }
@media (prefers-reduced-motion: reduce) { .sk { animation: none; } }

/* Stati vuoti */
.empty { text-align: center; padding: 48px 16px; color: var(--plum-soft); }
.empty svg { width: 160px; height: auto; margin-bottom: 8px; }
.empty h2 { font-size: 1.35rem; color: var(--plum); margin: 0 0 6px; }
.empty p { margin: 0; }

.book { background:#fff; border:1px solid var(--line); border-radius:16px; padding:10px; box-shadow:0 1px 2px rgba(0,0,0,.06); }
.book h2 { padding: 0 2px; }
.topbar { box-shadow: 0 1px 0 var(--line); }

/* Aiuto dopo un login fallito */
.help { margin-top: 18px; text-align: left; padding: 16px; background: var(--cream); border: 1px solid var(--line); border-radius: var(--radius); }
.help-title { margin: 0 0 8px; font-weight: 700; color: #B3261E; }
.help ul { margin: 0 0 16px; padding-left: 20px; color: var(--plum-soft); }
.help li { margin: 4px 0; }
.help .fine { margin: 10px 0 0; text-align: center; }

.vip-badge{display:inline-block;margin-top:6px;font-size:.8rem;font-weight:700;color:#fff;background:linear-gradient(90deg,#00377D,#0EA5F8);padding:4px 12px;border-radius:999px}
.vip-note{background:#FDF3E1;color:#7A4E0B;padding:12px 16px;border-radius:12px;margin:0 0 20px;font-size:.92rem}