:root {
  --bg: #f3f5f8;
  --card: #ffffff;
  --text: #17202b;
  --muted: #677385;
  --line: #e1e6ed;
  --primary: #1f3a5f;
  --primary-2: #2d5a8f;
  --accent: #e8eef6;
  --pos: #1a7f4b;
  --pos-bg: #e6f4ec;
  --neg: #c0362c;
  --neg-bg: #fbeceb;
  --warn-bg: #fff6e5;
  --warn-line: #f0c674;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  --tabbar-h: 62px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10151c;
    --card: #19212b;
    --text: #e7ecf2;
    --muted: #93a0b2;
    --line: #2a3542;
    --primary: #7fb0ea;
    --primary-2: #9cc3f0;
    --accent: #1f2c3b;
    --pos: #5cc98d;
    --pos-bg: #173326;
    --neg: #f07a70;
    --neg-bg: #3a1f1d;
    --warn-bg: #2e2716;
    --warn-line: #7a6431;
    --shadow: none;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  padding-bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 16px);
}
h1, h2, h3 { margin: 0; line-height: 1.25; }
a { color: inherit; }
code { font-size: .9em; }

/* ---------- top / tab bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: calc(env(safe-area-inset-top) + 10px) 16px 10px;
  background: #1f3a5f; color: #fff;
}
.topbar h1 { font-size: 17px; font-weight: 650; letter-spacing: .2px; }
.btn-new {
  text-decoration: none; font-weight: 600; font-size: 14px;
  background: rgba(255,255,255,.16); padding: 6px 12px; border-radius: 999px;
}
.btn-new[hidden] { display: none; }

.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  display: flex; justify-content: center;
  height: calc(var(--tabbar-h) + env(safe-area-inset-bottom));
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--card); border-top: 1px solid var(--line);
}
.tabbar a {
  flex: 1; max-width: 180px;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
  text-decoration: none; color: var(--muted); font-size: 12px; font-weight: 500;
}
.tabbar svg { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.tabbar a.on { color: var(--primary); }
body.locked .tabbar, body.locked .btn-new { display: none; }

/* ---------- layout ---------- */
.container { max-width: 760px; margin: 0 auto; padding: 14px 16px; }
.page-head { display: flex; align-items: baseline; gap: 12px; margin: 4px 0 12px; flex-wrap: wrap; }
.page-head h2 { font-size: 21px; }
.center { text-align: center; margin: -4px 0 10px; }
.empty { color: var(--muted); text-align: center; padding: 24px 8px; margin: 0; }
.hint { color: var(--muted); font-size: 13px; margin: 6px 0 12px; }
.muted { color: var(--muted); }
.pos { color: var(--pos); }
.neg { color: var(--neg); }
.link { color: var(--primary-2); text-decoration: none; font-weight: 500; }
.link:hover { text-decoration: underline; }

.card {
  display: block; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; margin: 0 0 12px;
}
.cards { list-style: none; padding: 0; margin: 0; }

/* ---------- month ---------- */
.month-nav { display: flex; align-items: center; justify-content: space-between; margin: 2px 0 12px; }
.month-nav h2 { font-size: 22px; text-transform: capitalize; }
.icon-btn {
  display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 50%;
  text-decoration: none; font-size: 26px; line-height: 1; background: var(--card); border: 1px solid var(--line);
}

.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.filters select { flex: 1 1 180px; }
.seg { display: inline-flex; background: var(--accent); border-radius: 10px; padding: 3px; }
.seg button {
  border: 0; background: transparent; color: var(--muted); font: inherit; font-size: 13px; font-weight: 550;
  padding: 6px 11px; border-radius: 8px; cursor: pointer;
}
.seg button.on { background: var(--card); color: var(--text); box-shadow: var(--shadow); }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 8px; margin-bottom: 14px; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; }
.stat span { display: block; font-size: 12px; color: var(--muted); }
.stat strong { font-size: 18px; font-variant-numeric: tabular-nums; }

.block { margin-bottom: 16px; }
.block h3 { font-size: 14px; text-transform: uppercase; letter-spacing: .5px; color: var(--muted); margin: 0 0 8px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.block.warn { background: var(--warn-bg); border: 1px solid var(--warn-line); border-radius: var(--radius); padding: 12px; }
.pill { background: var(--neg-bg); color: var(--neg); border-radius: 999px; padding: 1px 8px; font-size: 12px; text-transform: none; letter-spacing: 0; }

.rate-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.rata {
  display: flex; align-items: stretch; background: var(--card); border: 1px solid var(--line);
  border-left: 4px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.rata.soon { border-left-color: #e0a526; }
.rata.late { border-left-color: var(--neg); }
.rata.paid { border-left-color: var(--pos); opacity: .78; }
.rata.paid .amount { text-decoration: line-through; color: var(--muted); }
.rata-body { flex: 1; min-width: 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 2px; padding: 10px 12px 10px 4px; text-decoration: none; }
.rata-top { display: flex; align-items: center; gap: 6px; }
.rata-top strong, .c-top strong { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tag, .amount { flex-shrink: 0; }
.amount { margin-left: auto; font-weight: 650; font-variant-numeric: tabular-nums; white-space: nowrap; }
.rata-sub { font-size: 13px; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.rata-date { font-size: 13px; }
.rata.late .rata-date { color: var(--neg); }
.rata.paid .rata-date { color: var(--pos); }

.tag { font-size: 11px; font-weight: 600; padding: 1px 6px; border-radius: 6px; background: var(--accent); color: var(--primary-2); white-space: nowrap; }
.tag-societa { background: #efe7fb; color: #6a3fb5; }
@media (prefers-color-scheme: dark) { .tag-societa { background: #2c2240; color: #c4a6f2; } }

/* checkbox grande */
.check, .p-paid { position: relative; display: grid; place-items: center; cursor: pointer; }
.check { width: 58px; flex: 0 0 58px; }
.check input, .p-paid input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.check span, .p-paid span {
  width: 28px; height: 28px; border-radius: 8px; border: 2px solid #b7c1cf; background: var(--card);
  display: grid; place-items: center; transition: background .15s, border-color .15s;
}
.p-paid span { width: 24px; height: 24px; border-radius: 7px; }
.check input:checked + span, .p-paid input:checked + span { background: var(--pos); border-color: var(--pos); }
.check input:checked + span::after, .p-paid input:checked + span::after {
  content: ""; width: 7px; height: 13px; border: solid #fff; border-width: 0 3px 3px 0; transform: translateY(-1px) rotate(45deg);
}
.check input:focus-visible + span, .p-paid input:focus-visible + span { outline: 2px solid var(--primary-2); outline-offset: 2px; }

/* ---------- cartelle ---------- */
.cartella { text-decoration: none; }
.cartella:hover { border-color: var(--primary-2); }
.c-top { display: flex; align-items: center; gap: 6px; }
.c-desc { color: var(--muted); font-size: 13px; margin: 2px 0 8px; }
.c-meta { display: flex; justify-content: space-between; gap: 8px; font-size: 13px; margin-top: 4px; flex-wrap: wrap; }
.progress { height: 6px; background: var(--accent); border-radius: 999px; overflow: hidden; }
.progress i { display: block; height: 100%; background: var(--pos); border-radius: 999px; }

/* ---------- form ---------- */
.form label { display: grid; gap: 4px; font-size: 13px; font-weight: 550; color: var(--muted); margin-bottom: 10px; }
input, select, textarea {
  font: inherit; color: var(--text); background: var(--card);
  border: 1px solid var(--line); border-radius: 9px; padding: 9px 10px; width: 100%; min-width: 0;
}
input:focus, select:focus, textarea:focus { outline: 2px solid var(--primary-2); outline-offset: -1px; border-color: transparent; }
textarea { resize: vertical; }
.grid2, .grid3 { display: grid; gap: 0 10px; }
@media (min-width: 560px) { .grid2 { grid-template-columns: 1fr 1fr; } .grid3 { grid-template-columns: 1fr 1fr 1fr; } }
[hidden] { display: none !important; }

.form.inline { display: flex; flex-wrap: wrap; gap: 8px; }
.form.inline input { flex: 2 1 200px; }
.form.inline select { flex: 1 1 120px; }

.btn {
  font: inherit; font-weight: 600; font-size: 14px; cursor: pointer; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: 10px; border: 1px solid var(--line); background: var(--accent); color: var(--text);
}
.btn.primary { background: #1f3a5f; border-color: #1f3a5f; color: #fff; }
@media (prefers-color-scheme: dark) { .btn.primary { background: #2d5a8f; border-color: #2d5a8f; } }
.btn.ghost { background: transparent; }
.btn.danger { color: var(--neg); }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: default; }

.gen summary { cursor: pointer; font-weight: 650; list-style-position: inside; }
.gen[open] summary { margin-bottom: 12px; }
.gen label { display: grid; gap: 4px; font-size: 13px; font-weight: 550; color: var(--muted); margin-bottom: 10px; }

/* ---------- piano rate (editor) ---------- */
.plan-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }
.plan-head h3 { font-size: 16px; }
.plan-sum { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 13px; color: var(--muted); margin-bottom: 10px; }
.plan-sum b { color: var(--text); font-variant-numeric: tabular-nums; }
.plan-sum b.pos { color: var(--pos); }

.prow {
  display: grid; grid-template-columns: 20px minmax(0, 1.55fr) minmax(0, 1fr) 32px 28px;
  gap: 5px; align-items: center; padding: 5px 0; border-top: 1px solid var(--line);
}
.prow.phead { border-top: 0; font-size: 12px; color: var(--muted); font-weight: 600; padding-top: 0; }
.prow .pn { font-size: 12px; color: var(--muted); text-align: right; font-variant-numeric: tabular-nums; }
.prow input { padding: 7px 6px; }
.prow .p-date { font-size: 14px; }
.prow .p-imp { text-align: right; font-variant-numeric: tabular-nums; }
.prow .p-imp.invalid { border-color: var(--neg); background: var(--neg-bg); }
.prow.paid { background: var(--pos-bg); border-radius: 8px; }
.p-paid { height: 36px; }
.p-del {
  width: 30px; height: 30px; border: 0; border-radius: 8px; background: transparent; color: var(--muted);
  font-size: 20px; line-height: 1; cursor: pointer;
}
.p-del:hover { background: var(--neg-bg); color: var(--neg); }
.p-paydate { grid-column: 2 / -1; display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--pos); }
.p-paydate input { width: auto; padding: 4px 6px; font-size: 13px; }

.actions {
  position: sticky; bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 8px);
  display: flex; justify-content: flex-end; gap: 10px;
  padding: 10px; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 4px 16px rgba(0,0,0,.12);
}
.actions .btn.primary { min-width: 120px; }
.actions #btn-del { margin-right: auto; }

/* ---------- soggetti / login ---------- */
.sogg { display: flex; align-items: center; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.sogg small { display: block; color: var(--muted); margin-top: 2px; }
.row-actions { display: flex; gap: 6px; }
.settings h3 { font-size: 15px; margin-bottom: 8px; }
.settings p { display: flex; gap: 8px; flex-wrap: wrap; margin: 0 0 6px; }
.login { max-width: 360px; margin: 10vh auto 0; }
.login h2 { margin-bottom: 14px; }
.login .btn { width: 100%; }

/* ---------- toast ---------- */
.toast {
  position: fixed; left: 50%; bottom: calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 76px);
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none; z-index: 50;
  background: #17202b; color: #fff; padding: 10px 16px; border-radius: 10px; font-size: 14px;
  transition: opacity .2s, transform .2s; max-width: calc(100% - 32px); text-align: center;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast.ok { background: #1a7f4b; }
.toast.err { background: #c0362c; }