:root {
  --bg: #f4f7f8; --surface: #ffffff; --surface-2: #eef3f4; --text: #14202b; --muted: #5a6b79; --border: #d7e0e5;
  --accent: #0f766e; --accent-text: #ffffff; --accent-soft: #d5efec; --danger: #b42318; --good: #12805c; --warn-bg: #fff4d6; --warn-text: #6b4b00;
  --c1: #2563eb; --c2: #e0701a; --c3: #0f9d76; --c4: #c026a3;
  --shadow: 0 1px 2px rgba(16, 32, 43, .06), 0 2px 8px rgba(16, 32, 43, .05);
  --radius: 12px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1519; --surface: #182229; --surface-2: #1f2c34; --text: #e7eef2; --muted: #9db0bd; --border: #2c3b45;
    --accent: #2dd4bf; --accent-text: #05211e; --accent-soft: #123c38; --danger: #ff8a7a; --good: #4ade9a; --warn-bg: #3a3012; --warn-text: #f5dd9a;
    --c1: #6aa6ff; --c2: #ffa24d; --c3: #3ddcae; --c4: #f07be0;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh; display: flex; flex-direction: column; overflow-x: hidden;
}
h1 { font-size: 1.6rem; margin: .2rem 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 .75rem; }
h3 { font-size: 1rem; margin: 0 0 .5rem; }
a { color: var(--accent); }
code { background: var(--surface-2); padding: .1rem .35rem; border-radius: 6px; word-break: break-all; }
hr { border: 0; border-top: 1px solid var(--border); margin: 1.25rem 0; }
.muted { color: var(--muted); }
.center { text-align: center; }
.good { color: var(--good); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 0; background: var(--accent); color: var(--accent-text); padding: .5rem 1rem; z-index: 100; }
.skip:focus { left: 0; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

/* layout */
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 20; }
.topbar-inner { max-width: 1000px; margin: 0 auto; padding: .6rem 16px; display: flex; align-items: center; gap: 1.5rem; }
.brand { display: inline-flex; align-items: center; gap: .5rem; font-weight: 700; font-size: 1.1rem; color: var(--text); text-decoration: none; }
.brand img { border-radius: 6px; }
.topnav { display: none; gap: .25rem; flex-wrap: wrap; }
.topnav a, .tabbar a { text-decoration: none; color: var(--muted); font-weight: 600; border-radius: 8px; }
.topnav a { padding: .4rem .8rem; }
.topnav a:hover { background: var(--surface-2); }
.topnav a.active, .tabbar a.active { color: var(--accent); background: var(--accent-soft); }
.tabbar {
  display: none; position: fixed; bottom: 0; left: 0; right: 0; background: var(--surface); border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom); z-index: 20;
}
body.authed .tabbar { display: flex; }
.tabbar a { flex: 1; text-align: center; padding: .7rem .1rem; font-size: .72rem; border-radius: 0; min-width: 0; overflow: hidden; text-overflow: ellipsis; }
main { flex: 1; width: 100%; max-width: 1000px; margin: 0 auto; padding: 16px 16px 5.5rem; }
main:focus { outline: none; }
.footer { text-align: center; color: var(--muted); font-size: .8rem; padding: 0 16px 5.5rem; max-width: 700px; margin: 0 auto; }
@media (min-width: 720px) {
  .topnav { display: flex; }
  body.authed .tabbar { display: none; }
  main { padding-bottom: 2rem; }
  .footer { padding-bottom: 1.5rem; }
}
.share-page main, .share-page .footer { padding-bottom: 2rem; }

/* cards & tiles */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; margin-bottom: 16px; box-shadow: var(--shadow); }
.card.callout { border-color: var(--accent); background: var(--accent-soft); }
.tiles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin-bottom: 16px; }
@media (min-width: 720px) { .tiles { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (min-width: 900px) { .tiles { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.tile { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 12px 14px; box-shadow: var(--shadow); min-width: 0; }
.tile-label { color: var(--muted); font-size: .8rem; font-weight: 600; text-transform: uppercase; letter-spacing: .03em; }
.tile-value { font-size: 1.35rem; font-weight: 700; overflow-wrap: anywhere; }
.tile-sub { color: var(--muted); font-size: .8rem; }
.tile.good .tile-value { color: var(--good); }
.chart-grid { display: grid; gap: 16px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .chart-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
.chart-card { margin-bottom: 0; }
.shared-view .chart-card { margin-bottom: 16px; }
.chart-box { position: relative; height: 240px; }

/* forms */
.stack { display: grid; gap: 12px; }
.field { display: grid; gap: 4px; min-width: 0; align-content: start; }
.field label, fieldset legend { font-weight: 600; font-size: .9rem; }
.hint { color: var(--muted); font-size: .8rem; }
input, select, textarea {
  font: inherit; color: var(--text); background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
  padding: .55rem .7rem; width: 100%; min-width: 0; min-height: 44px;
}
input:not([type=checkbox]):not([type=radio]), select { height: 44px; }
input[type=checkbox], input[type=radio] { width: 1.2rem; height: 1.2rem; min-height: 0; padding: 0; accent-color: var(--accent); flex: none; }
.form-grid { display: grid; gap: 12px 16px; grid-template-columns: repeat(auto-fill, minmax(min(100%, 240px), 1fr)); }
.inline-form { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 150px), 1fr)); align-items: end; margin-bottom: 12px; }
fieldset { border: 1px solid var(--border); border-radius: 10px; padding: 8px 12px 10px; margin: 0; min-width: 0; }
fieldset[hidden] { display: none; }
.check { display: flex; align-items: center; gap: .6rem; padding: .3rem 0; cursor: pointer; }
.btn, button {
  font: inherit; font-weight: 600; cursor: pointer; border-radius: 8px; padding: .55rem 1rem; min-height: 44px;
  border: 1px solid var(--border); background: var(--surface-2); color: var(--text); text-decoration: none; display: inline-flex; align-items: center; justify-content: center; gap: .4rem;
}
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn.danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.btn.small { padding: .25rem .65rem; min-height: 34px; font-size: .85rem; }
.btn.big { font-size: 1.1rem; padding: .9rem 1rem; width: 100%; }
button:disabled { opacity: .55; cursor: not-allowed; }
.warn { background: var(--warn-bg); color: var(--warn-text); padding: .6rem .8rem; border-radius: 8px; font-size: .9rem; }
.divider { display: flex; align-items: center; gap: .75rem; color: var(--muted); font-size: .85rem; }
.divider::before, .divider::after { content: ""; flex: 1; border-top: 1px solid var(--border); }
details.invite { margin-top: 1rem; border-top: 1px solid var(--border); padding-top: .75rem; }
details.invite summary { cursor: pointer; font-weight: 600; margin-bottom: .75rem; }

/* auth */
.auth-wrap { display: flex; justify-content: center; padding-top: 2vh; }
.auth-card { width: 100%; max-width: 420px; display: grid; gap: 12px; }
.auth-card h1 { margin: 0; }

/* tables / lists */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; margin: 8px 0; }
table { border-collapse: collapse; width: 100%; font-size: .9rem; }
th, td { text-align: left; padding: .5rem .6rem; border-bottom: 1px solid var(--border); white-space: nowrap; vertical-align: middle; }
td.note { white-space: normal; min-width: 8rem; overflow-wrap: anywhere; }
th { color: var(--muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .03em; }
tr.me { background: var(--accent-soft); }
td.actions { display: flex; gap: .4rem; }
.list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.list li { padding: .5rem 0; border-bottom: 1px solid var(--border); }
.row { display: flex; align-items: center; gap: .6rem; }
.row.between { justify-content: space-between; }
.row.wrap { flex-wrap: wrap; }
.badge { display: inline-block; font-size: .72rem; font-weight: 700; padding: .1rem .5rem; border-radius: 999px; background: var(--surface-2); color: var(--muted); margin-left: .4rem; text-transform: uppercase; letter-spacing: .03em; }
.badge.build { background: var(--accent-soft); color: var(--accent); }
.badge.deload { background: var(--warn-bg); color: var(--warn-text); }
.badge.intensify { background: color-mix(in srgb, var(--c2) 22%, transparent); color: var(--c2); }
.badge.peak { background: color-mix(in srgb, var(--c4) 22%, transparent); color: var(--c4); }
.row > .badge { margin-left: 0; }

/* plan */
.week-picker { max-width: 220px; margin-bottom: 12px; }
.cardio { background: var(--surface-2); border-radius: 10px; padding: .6rem .9rem; }
.cardio ul { margin: .3rem 0 0; padding-left: 1.2rem; }
.card.day.today { border-color: var(--accent); }
.exercise { padding: .75rem 0; border-top: 1px solid var(--border); }
.ex-meta { font-size: .85rem; }
.set-row { display: grid; grid-template-columns: 3.2rem minmax(0, 1fr) .8rem minmax(0, 1fr); gap: 6px; align-items: center; margin-top: 6px; }
.set-row .last { grid-column: 2 / -1; font-size: .75rem; }
.set-row .save-status { grid-column: 2 / -1; font-size: .75rem; color: var(--good); min-height: 0; }
.set-row .save-status:empty { display: none; }
.set-no { font-size: .8rem; color: var(--muted); }
.set-row .times { text-align: center; color: var(--muted); }
.set-row .last:empty { display: none; }
.done-box { margin-top: .75rem; padding-top: .75rem; border-top: 1px solid var(--border); font-weight: 600; }

/* toasts */
.toasts { position: fixed; left: 12px; right: 12px; bottom: 5rem; display: grid; gap: 8px; z-index: 50; pointer-events: none; justify-items: center; }
@media (min-width: 720px) { .toasts { bottom: 1.5rem; } }
.toast { pointer-events: auto; max-width: 480px; background: var(--text); color: var(--bg); padding: .7rem 1rem; border-radius: 10px; box-shadow: 0 6px 20px rgba(0, 0, 0, .25); transition: opacity .3s; }
.toast.err { background: var(--danger); color: #fff; }
@media (prefers-color-scheme: dark) { .toast.err { color: #1a0502; } }
.toast.out { opacity: 0; }
@media (prefers-reduced-motion: reduce) { * { transition: none !important; animation: none !important; } }

/* v2: training card */
[hidden] { display: none !important; }
.pills { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }
.pill {
  display: inline-flex; align-items: center; gap: .45rem; min-height: 38px; padding: .3rem .75rem;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface-2); cursor: pointer;
  font-size: .9rem; max-width: 100%; user-select: none;
}
.pill span { overflow-wrap: anywhere; }
.pill:has(input:checked) { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); font-weight: 600; }
.pill:has(input:focus-visible) { outline: 3px solid var(--accent); outline-offset: 2px; }
.preset-bar { display: grid; gap: 8px; }
.equip-groups { display: grid; gap: 12px; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 900px) { .equip-groups { grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; } }
.equip-group { display: grid; gap: 6px; }
.group-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.check.split { align-items: flex-start; padding: .4rem 0; }
.check.split input { margin-top: .2rem; }
form.training h3 { margin-bottom: 0; }

/* v2: plan */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 12px; }
.chip { display: inline-block; font-size: .82rem; padding: .2rem .7rem; border-radius: 999px; background: var(--surface-2); border: 1px solid var(--border); color: var(--muted); max-width: 100%; overflow-wrap: anywhere; }
.chip.strong { background: var(--accent-soft); color: var(--accent); border-color: transparent; font-weight: 700; }
.chip.warnchip { background: var(--warn-bg); color: var(--warn-text); border-color: transparent; }
.swap-reset { margin-bottom: 12px; }
.cardio-sub { margin-top: .4rem; font-size: .9rem; overflow-wrap: anywhere; }
.ex-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 8px; }
.ex-title { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 0; min-width: 0; overflow-wrap: anywhere; }
.ex-head .btn { flex: none; }
.badge.swapped { background: color-mix(in srgb, var(--c1) 20%, transparent); color: var(--c1); }
.badge.good { background: color-mix(in srgb, var(--good) 20%, transparent); color: var(--good); }
.cap-hint { margin: 6px 0; font-size: .85rem; }

/* swap modal / bottom sheet */
.modal-backdrop { position: fixed; inset: 0; z-index: 60; background: rgba(0, 0, 0, .5); display: flex; align-items: flex-end; justify-content: center; }
.modal {
  background: var(--surface); color: var(--text); width: 100%; max-width: 560px; max-height: 88vh; max-height: 88dvh;
  display: flex; flex-direction: column; border-radius: var(--radius) var(--radius) 0 0; box-shadow: 0 -4px 24px rgba(0, 0, 0, .3);
}
.modal:focus { outline: none; }
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 14px 16px 10px; border-bottom: 1px solid var(--border); }
.modal-head h2 { margin: 0; overflow-wrap: anywhere; }
.modal-body { padding: 12px 16px; overflow-y: auto; flex: 1; min-height: 0; }
.modal-foot { padding: 10px 16px calc(10px + env(safe-area-inset-bottom)); border-top: 1px solid var(--border); }
@media (min-width: 720px) {
  .modal-backdrop { align-items: center; }
  .modal { border-radius: var(--radius); }
}
.alts { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.alt { display: flex; align-items: flex-start; gap: 10px; justify-content: space-between; border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
.alt.current { border-color: var(--accent); background: var(--accent-soft); }
.alt-main { min-width: 0; display: grid; gap: 4px; }
.alt-title, .alt-tags { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 0; overflow-wrap: anywhere; }
.alt-req { font-size: .8rem; margin-left: .5rem; }
.alt .btn { flex: none; }