:root {
    --bg: #f6f7f5;
    --surface: #ffffff;
    --border: #e4e7e2;
    --text: #1f2421;
    --muted: #6b726d;
    --accent: #3fa33a;
    --accent-strong: #2f8a2b;
    --accent-soft: #eaf6e4;
    --warn-soft: #fff5e0;
    --warn-text: #8a5a00;
    --danger: #c0392b;
    --radius: 12px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: 'Nunito', system-ui, -apple-system, 'Segoe UI', sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

a { color: var(--accent-strong); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3 { margin: 0 0 8px; line-height: 1.25; font-weight: 700; }
h1 { font-size: 24px; }
h2 { font-size: 18px; }
p { margin: 0 0 12px; }

.container { max-width: 680px; margin: 0 auto; padding: 0 16px; }

/* header */
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); }
.topbar .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 60px; }
.topbar img { height: 26px; display: block; }
.topbar.guest .container { justify-content: center; }
.topbar nav { display: flex; gap: 16px; font-size: 14px; white-space: nowrap; }
.topbar nav a { color: var(--muted); }
.topbar nav a.active { color: var(--text); font-weight: 700; }

main { padding: 28px 0 48px; }

.page-head { margin-bottom: 20px; }
.page-head p { color: var(--muted); margin: 0; }
.back { display: inline-block; font-size: 14px; margin-bottom: 12px; color: var(--muted); }

/* cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 20px;
    margin-bottom: 12px;
}
.card-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.card-title { font-size: 18px; font-weight: 700; margin: 0; }
.card-date { color: var(--muted); font-size: 14px; }
.card-row { margin-top: 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.card-links { margin-top: 14px; padding-top: 12px; border-top: 1px solid var(--border); display: flex; gap: 20px; font-size: 14px; flex-wrap: wrap; }
.card.is-mine { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }

.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    background: var(--bg);
    color: var(--muted);
    white-space: nowrap;
}
.badge.soon { background: var(--accent-soft); color: var(--accent-strong); }
.badge.today { background: var(--accent); color: #fff; }

.muted { color: var(--muted); }
.small { font-size: 14px; }
.unclaimed { color: var(--warn-text); }

/* payment details */
details.pay { margin-top: 12px; font-size: 14px; }
details.pay summary { cursor: pointer; color: var(--accent-strong); }
.pay-box {
    margin-top: 8px;
    padding: 10px 12px;
    background: var(--bg);
    border-radius: 8px;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 13px;
}

/* past */
details.past { margin-top: 32px; }
details.past > summary { cursor: pointer; color: var(--muted); font-weight: 700; margin-bottom: 12px; }
.list { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }
.list-row { display: flex; justify-content: space-between; gap: 12px; padding: 12px 20px; border-top: 1px solid var(--border); font-size: 15px; }
.list-row:first-child { border-top: 0; }

.empty { text-align: center; padding: 36px 20px; color: var(--muted); }

/* buttons and forms */
.btn {
    display: inline-block;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    border-radius: 8px;
    padding: 8px 16px;
    font: inherit;
    font-size: 15px;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
}
.btn:hover { text-decoration: none; border-color: #c9cec6; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); border-color: var(--accent-strong); }
.btn-sm { padding: 5px 12px; font-size: 14px; }
.btn[disabled] { opacity: .6; cursor: default; }
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

.field { display: block; font-weight: 700; margin-bottom: 6px; }
textarea, input[type=number] {
    width: 100%;
    font: inherit;
    font-size: 15px;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 12px;
    background: var(--surface);
}
textarea:focus, input:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.hint { color: var(--muted); font-size: 14px; margin-top: 6px; }

.flash { border-radius: 8px; padding: 10px 14px; margin-bottom: 16px; font-size: 15px; }
.flash.ok { background: var(--accent-soft); color: var(--accent-strong); }
.flash.warn { background: var(--warn-soft); color: var(--warn-text); }

/* suggestions */
.suggestion { padding: 14px 20px; border-top: 1px solid var(--border); }
.suggestion:first-child { border-top: 0; }
.suggestion-text { white-space: pre-wrap; word-break: break-word; }
.suggestion-meta { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* contributions */
.contrib-total { font-size: 28px; font-weight: 700; }
.contrib-row { display: flex; align-items: center; gap: 12px; padding: 10px 20px; border-top: 1px solid var(--border); }
.contrib-row:first-child { border-top: 0; }
.contrib-row .name { flex: 1; }
.contrib-row input[type=checkbox] { width: 18px; height: 18px; accent-color: var(--accent); }
.contrib-row input[type=number] { width: 90px; padding: 6px 8px; text-align: right; }
.save-bar { position: sticky; bottom: 0; background: var(--bg); padding: 12px 0; display: flex; align-items: center; gap: 12px; }

/* login and message pages */
.center-card { max-width: 440px; margin: 40px auto 0; text-align: center; }
.center-card .card { padding: 32px 28px; }
.google-btn { display: inline-flex; align-items: center; gap: 10px; }

@media (max-width: 520px) {
    .topbar .container { height: auto; flex-direction: column; align-items: flex-start; gap: 8px; padding-top: 14px; padding-bottom: 10px; }
    .topbar nav { gap: 16px; }
    .topbar nav .hide-sm { display: none; }
    main { padding-top: 20px; }
    .card { padding: 16px; }
    .list-row, .suggestion, .contrib-row { padding-left: 16px; padding-right: 16px; }
}