:root {
  --bg: #0b0f14;
  --card: #141a22;
  --card-2: #1a222c;
  --border: #253040;
  --border-soft: #1e2833;
  --fg: #e9edf3;
  --muted: #93a1b3;
  --faint: #5f6c7d;
  --accent: #4dd0a5;
  --accent-dim: rgba(77, 208, 165, .13);
  --accent2: #c792ea;
  --accent2-dim: rgba(199, 146, 234, .12);
  --warn: #ffb74d;
  --warn-dim: rgba(255, 183, 77, .12);
  --danger: #ef5350;
  --danger-dim: rgba(239, 83, 80, .12);
  --swim: #4fc3f7;
  --bike: #4dd0a5;
  --run: #ffab91;
  --radius: 14px;
  --radius-s: 9px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
main { max-width: 920px; margin: 0 auto; padding: 20px 16px 64px; }

/* ---------- typography ---------- */
h1 { font-size: 25px; font-weight: 700; letter-spacing: -.02em; margin: 10px 0 4px; }
h2 { font-size: 18px; font-weight: 650; letter-spacing: -.01em; margin: 0 0 10px; }
h3 { font-size: 12px; font-weight: 600; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 18px 0 8px; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: var(--muted); text-decoration: none; }
.faint { color: var(--faint); }
small, .small { font-size: 13px; }
.num { font-variant-numeric: tabular-nums; }

.icon { vertical-align: -2px; flex: none; }

/* ---------- topbar ---------- */
.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 20px; border-bottom: 1px solid var(--border-soft);
  position: sticky; top: 0; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); z-index: 50;
}
.brand { display: flex; align-items: center; }
.brand-logo { height: 24px; width: auto; border: 0; margin: 0; border-radius: 0; }
.topbar-ctx { color: var(--muted); font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar .spacer { flex: 1; }

/* ---------- cards ---------- */
.card {
  background: var(--card); border: 1px solid var(--border-soft);
  border-radius: var(--radius); padding: 18px 20px; margin: 14px 0;
}
.card > :first-child { margin-top: 0; }

/* ---------- buttons ---------- */
button, .btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  background: var(--card-2); color: var(--fg);
  border: 1px solid var(--border); border-radius: var(--radius-s);
  padding: 8px 15px; font: inherit; font-size: 14px; cursor: pointer;
  transition: background .12s ease, border-color .12s ease, transform .05s ease;
  text-decoration: none;
}
button:hover:not(:disabled), .btn:hover { background: #212b37; text-decoration: none; }
button:active:not(:disabled) { transform: translateY(.5px); }
button.primary { background: var(--accent); border-color: var(--accent); color: #08110d; font-weight: 600; }
button.primary:hover:not(:disabled) { background: #5fdab2; }
button:disabled { opacity: .45; cursor: not-allowed; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 2px;
}
.iconbtn {
  padding: 6px; border-radius: 8px; background: transparent; border-color: transparent;
  color: var(--muted);
}
.iconbtn:hover:not(:disabled) { color: var(--fg); background: var(--card-2); }
.linklike { background: none; border: none; padding: 0; color: var(--accent); cursor: pointer; }

.spinner {
  width: 13px; height: 13px; border-radius: 50%; flex: none;
  border: 2px solid currentColor; border-top-color: transparent;
  animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- chips & badges ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12.5px; font-weight: 500; padding: 3px 10px; border-radius: 99px;
  border: 1px solid var(--border); color: var(--muted); text-decoration: none;
  transition: filter .12s ease;
}
a.chip:hover { text-decoration: none; filter: brightness(1.15); }
.chip.ok     { border-color: transparent; background: var(--accent-dim);  color: var(--accent); }
.chip.warn   { border-color: transparent; background: var(--warn-dim);    color: var(--warn); }
.chip.danger { border-color: transparent; background: var(--danger-dim);  color: var(--danger); }
.chip.coach  { border-color: transparent; background: var(--accent2-dim); color: var(--accent2); }
.chip.info   { border-color: var(--border); color: var(--muted); }

.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; display: inline-block; }
.dot.green { background: var(--accent); box-shadow: 0 0 8px rgba(77,208,165,.5); }
.dot.amber { background: var(--warn);   box-shadow: 0 0 8px rgba(255,183,77,.5); }
.dot.red   { background: var(--danger); box-shadow: 0 0 8px rgba(239,83,80,.55); }

/* ---------- banners ---------- */
.banner {
  padding: 10px 14px; border-radius: 10px; margin: 12px 0; font-size: 14px;
  transition: opacity .5s ease, transform .5s ease;
}
.banner.ok { background: var(--accent-dim); border: 1px solid rgba(77,208,165,.4); }
.banner.warn { background: var(--warn-dim); border: 1px solid rgba(255,183,77,.4); }
.banner.hide { opacity: 0; transform: translateY(-4px); pointer-events: none; }

/* ---------- forms ---------- */
form label { display: block; font-size: 13px; color: var(--muted); margin: 8px 0 3px; }
form label.inline { display: flex; align-items: center; gap: 7px; margin: 8px 0; color: var(--fg); font-size: 14px; }
input, select, textarea {
  background: var(--bg); color: var(--fg);
  border: 1px solid var(--border); border-radius: var(--radius-s);
  padding: 7px 10px; font: inherit; width: 100%;
  transition: border-color .12s ease;
}
input:hover, select:hover, textarea:hover { border-color: #34435a; }
input[type=checkbox] { width: auto; accent-color: var(--accent); }
.actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; margin: 12px 0 0; }
.actions form { display: flex; gap: 10px; align-items: flex-end; margin: 0; }
.actions input, .actions select { width: auto; }

/* ---------- tables ---------- */
table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 14px; font-variant-numeric: tabular-nums; }
th, td { text-align: left; padding: 7px 10px; border-bottom: 1px solid var(--border-soft); }
th { color: var(--muted); font-weight: 500; font-size: 13px; }
tr:last-child td { border-bottom: 0; }

/* ---------- stat strip ---------- */
.statstrip {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 10px; margin: 14px 0;
}
.stat {
  background: var(--card); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 12px 16px 10px;
}
.stat-num { display: block; font-size: 22px; font-weight: 700; letter-spacing: -.02em; font-variant-numeric: tabular-nums; line-height: 1.25; }
.stat-num .unit, .stat-num .dim { font-size: 14px; font-weight: 500; color: var(--muted); }
.stat-label { display: block; font-size: 12px; color: var(--muted); margin-top: 1px; }

.delta-up { color: var(--accent); font-weight: 600; }
.delta-down { color: var(--warn); font-weight: 600; }

/* ---------- athlete card (dashboard) ---------- */
.ath-head { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.ath-head h2 { margin: 0; font-size: 19px; flex: none; }
.ath-head .chips { display: flex; gap: 7px; flex-wrap: wrap; margin-left: auto; }
.ath-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px; margin: 14px 0 4px; align-items: end;
}
.ath-stat .stat-num { font-size: 19px; }
.spark { display: block; margin-top: 4px; }
.spark polyline { fill: none; stroke: var(--accent); stroke-width: 1.6; }
.spark .spark-area { fill: var(--accent-dim); stroke: none; }
.ath-foot {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  border-top: 1px solid var(--border-soft); margin-top: 14px; padding-top: 12px;
}
.ath-foot .right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.ath-foot form { margin: 0; display: inline-flex; }

/* alerts */
.alert-item {
  border-left: 3px solid var(--warn); background: var(--warn-dim);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  padding: 9px 13px; margin: 8px 0; font-size: 13.5px;
}
.alert-item.critical { border-left-color: var(--danger); background: var(--danger-dim); }
.alert-item .sugg { color: var(--muted); display: block; margin-top: 3px; }

/* ---------- details / disclosure ---------- */
details { margin: 6px 0; }
details > summary {
  cursor: pointer; list-style: none; user-select: none;
  display: flex; align-items: center; gap: 8px;
}
details > summary::-webkit-details-marker { display: none; }
details.plain > summary { color: var(--muted); font-size: 13.5px; }
details.plain > summary::before {
  content: ""; width: 7px; height: 7px; flex: none;
  border-right: 1.5px solid var(--muted); border-bottom: 1.5px solid var(--muted);
  transform: rotate(-45deg); transition: transform .15s ease; margin: 0 2px;
}
details.plain[open] > summary::before { transform: rotate(45deg); }

/* ---------- week: timeline ---------- */
.weeknav { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.weeknav h1 { margin: 0; flex: 1 1 auto; min-width: 200px; }
.weeknav .nav { display: flex; gap: 6px; }
.weeknav .nav a, .weeknav .nav span {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: var(--radius-s);
  border: 1px solid var(--border); color: var(--fg);
}
.weeknav .nav a:hover { background: var(--card-2); text-decoration: none; }
.weeknav .nav span { opacity: .3; }

.session {
  background: var(--card); border: 1px solid var(--border-soft);
  border-radius: var(--radius); margin: 8px 0; overflow: hidden;
}
.session > summary {
  padding: 12px 16px; display: flex; align-items: center; gap: 12px;
  transition: background .12s ease;
}
.session > summary:hover { background: var(--card-2); }
.session[open] > summary { border-bottom: 1px solid var(--border-soft); }
.sporticon {
  width: 34px; height: 34px; border-radius: 10px; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
}
.sporticon.swim { background: rgba(79,195,247,.14); color: var(--swim); }
.sporticon.bike { background: rgba(77,208,165,.14); color: var(--bike); }
.sporticon.run  { background: rgba(255,171,145,.16); color: var(--run); }
.sporticon.other{ background: var(--card-2); color: var(--muted); }
.session-main { flex: 1; min-width: 0; }
.session-title { font-weight: 600; font-size: 14.5px; display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; }
.session-title .day { color: var(--muted); font-weight: 500; }
.session-meta { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; margin-top: 1px; }
.session-chips { display: flex; gap: 5px; flex-wrap: wrap; justify-content: flex-end; max-width: 40%; }
.session-body { padding: 12px 16px 16px; }
.session-body img { margin-top: 4px; }

.session.ghost { border-style: dashed; border-color: var(--border); background: transparent; }
.session.ghost .row { padding: 12px 16px; display: flex; align-items: center; gap: 12px; color: var(--muted); }
.session.ghost .sporticon { opacity: .55; background: transparent; border: 1.5px dashed var(--border); }

.comment-form { display: flex; gap: 8px; margin-top: 10px; }
.comment-form input { flex: 1; font-size: 13px; }
.comment-form button { padding: 6px 12px; font-size: 13px; }

/* ---------- tabs ---------- */
.tabs { margin-top: 18px; }
.tabs input[type=radio] {
  position: absolute; opacity: 0; pointer-events: none;
  width: 1px; height: 1px; margin: 0; padding: 0;
}
.tabbar {
  display: inline-flex; gap: 2px; padding: 3px;
  background: var(--card); border: 1px solid var(--border-soft); border-radius: 11px;
}
.tabbar label {
  margin: 0; padding: 7px 16px; border-radius: 8px; cursor: pointer;
  font-size: 13.5px; font-weight: 550; color: var(--muted);
  transition: background .12s ease, color .12s ease;
}
.tabbar label:hover { color: var(--fg); }
.tabpanel { display: none; }
#tab-coach:checked   ~ .tabbar label[for=tab-coach],
#tab-athlete:checked ~ .tabbar label[for=tab-athlete],
#tab-email:checked   ~ .tabbar label[for=tab-email] { background: var(--card-2); color: var(--fg); }
#tab-coach:checked   ~ .tabpanel.coach,
#tab-athlete:checked ~ .tabpanel.athlete,
#tab-email:checked   ~ .tabpanel.email { display: block; }

/* ---------- growth ---------- */
.subnav {
  position: sticky; top: 49px; z-index: 40;
  display: flex; gap: 6px; overflow-x: auto; padding: 10px 0;
  background: color-mix(in srgb, var(--bg) 92%, transparent); backdrop-filter: blur(10px);
  scrollbar-width: none;
}
.subnav::-webkit-scrollbar { display: none; }
.subnav a {
  flex: none; font-size: 13px; font-weight: 550; color: var(--muted);
  padding: 6px 14px; border-radius: 99px; border: 1px solid var(--border);
}
.subnav a:hover { color: var(--fg); text-decoration: none; background: var(--card-2); }
section[id] { scroll-margin-top: 110px; }

.deltachips { display: flex; gap: 8px; flex-wrap: wrap; margin: 4px 0 12px; }
.proj-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 10px; margin: 10px 0; }
.proj-grid .stat-num { font-size: 26px; }

.md { font-size: 14.5px; }
.md.athlete { border-left: 3px solid var(--accent); padding-left: 14px; }
.attention {
  border: 1px solid rgba(199,146,234,.4); border-radius: 10px;
  padding: 4px 16px 10px; margin-bottom: 14px;
  background: var(--accent2-dim);
}
.email-form textarea { font-family: inherit; }

img { max-width: 100%; border-radius: 10px; margin-top: 10px; border: 1px solid var(--border-soft); }
.chart-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 10px; }

/* ---------- dialog ---------- */
dialog {
  background: var(--card); color: var(--fg);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px; max-width: 420px; width: calc(100% - 40px);
}
dialog::backdrop { background: rgba(4, 7, 10, .65); backdrop-filter: blur(3px); }
dialog h2 { margin-top: 0; }
dialog .dialog-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 18px; }

/* ---------- dropzone (lab test upload) ---------- */
.dropzone {
  border: 1.5px dashed var(--border); border-radius: var(--radius);
  padding: 34px 20px; text-align: center; color: var(--muted); cursor: pointer;
  transition: border-color .15s ease, background .15s ease; position: relative;
}
.dropzone:hover, .dropzone.drag { border-color: var(--accent); background: var(--accent-dim); color: var(--fg); }
.dropzone input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.dz-label { display: block; font-weight: 600; color: var(--fg); margin-top: 8px; }

.field-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 4px 14px; }
.confidence-note { font-size: 13px; color: var(--warn); margin: 4px 0; }

/* ---------- misc ---------- */
.page-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.page-head .crumb { font-size: 13px; }
.empty { color: var(--muted); font-size: 14px; }

.onboard { list-style: none; padding: 0; margin: 10px 0 0; }
.onboard li { display: flex; align-items: center; gap: 10px; padding: 6px 0; color: var(--muted); }
.onboard li.done { color: var(--fg); }
.onboard .step {
  width: 22px; height: 22px; border-radius: 50%; flex: none;
  border: 1.5px solid var(--border); display: inline-flex; align-items: center; justify-content: center;
  font-size: 12px; color: var(--muted);
}
.onboard li.done .step { border-color: var(--accent); background: var(--accent-dim); color: var(--accent); }

@media (max-width: 640px) {
  main { padding: 12px 12px 56px; }
  .card { padding: 14px 15px; }
  .session-chips { max-width: none; }
  .session > summary { flex-wrap: wrap; }
  .actions { flex-direction: column; align-items: stretch; }
  .actions form { flex-wrap: wrap; }
  .ath-head .chips { margin-left: 0; }
}