:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #1c1f24;
  --muted: #6b7280;
  --border: #e3e5e9;
  --accent: #f26b1d;
  --accent-text: #ffffff;
  --user-bubble: #fff1e8;
  --error: #c62828;
  --grid: #e9ebef;
  --z1: #9aa3ad;
  --z2: #3b82f6;
  --z3: #22a35a;
  --z4: #e3b008;
  --z5: #f97316;
  --z6: #e11d48;
  --radius: 10px;
  --series: #2f6fd6;
  --good: #1f9d55;
  --warning: #d29b00;
  --serious: #e06c14;
  --critical: #d23c3c;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --surface: #1b1e24;
    --text: #e8eaed;
    --muted: #9aa0a8;
    --border: #2c3038;
    --user-bubble: #3a2618;
    --error: #ff6b6b;
    --grid: #2a2e35;
    --series: #6aa1f5;
    --good: #3ec27a;
    --warning: #e8b931;
    --serious: #f08a3c;
    --critical: #f06a6a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
h1, h2 { margin: 0 0 .25rem; line-height: 1.2; }
h1 { font-size: 1.5rem; }
h2 { font-size: 1.15rem; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.error { color: var(--error); margin: 0; }
.success { color: var(--z3); margin: .6rem 0 0; }

button, .btn {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: .5rem .85rem;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
}
button:hover, .btn:hover { border-color: var(--muted); }
button:disabled { opacity: .6; cursor: default; }
.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.primary:hover { filter: brightness(1.05); border-color: var(--accent); }
.link { border: none; background: none; color: var(--accent); padding: 0; }
.wide { width: 100%; }
.icon-btn { padding: .35rem .6rem; }

input, textarea {
  font: inherit;
  width: 100%;
  padding: .55rem .7rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
input:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
label { display: grid; gap: .3rem; font-size: .9rem; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* auth */
.auth { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.auth-card { width: 100%; max-width: 380px; padding: 1.75rem; display: grid; gap: .9rem; }
.auth-card p { margin: 0; }

/* layout */
.app {
  height: 100%;
  display: grid;
  grid-template-columns: 240px 1fr;
  grid-template-rows: auto 1fr;
  grid-template-areas: "top top" "side main";
}
.topbar {
  grid-area: top;
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: .45rem; color: var(--text); font-weight: 800; text-decoration: none; white-space: nowrap; }
.brand .grind { color: var(--accent); }
.auth-logo { font-size: 1.6rem; letter-spacing: -.01em; }
.auth-legal { border-top: 1px solid var(--border); padding-top: .8rem; }
.auth-legal a { color: var(--accent); }
.spacer { flex: 1; }
#menu-btn { display: none; }
.sidebar {
  grid-area: side;
  padding: 16px;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  background: var(--surface);
}
.workout-list { list-style: none; margin: 1rem 0 0; padding: 0; display: grid; gap: 2px; }
.workout-list li {
  display: flex; align-items: center; gap: .4rem;
  padding: .5rem .6rem; border-radius: 8px; cursor: pointer;
}
.workout-list li:hover { background: var(--bg); }
.workout-list li.active { background: var(--user-bubble); }
.workout-list .w-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.workout-list .del { border: none; background: none; color: var(--muted); padding: 0 .2rem; visibility: hidden; }
.workout-list li:hover .del { visibility: visible; }
.sport-dot { font-size: .9rem; }

.main {
  grid-area: main;
  display: grid;
  grid-template-columns: minmax(300px, 2fr) 3fr;
  gap: 16px;
  padding: 16px;
  min-height: 0;
}

/* chat */
.chat { display: flex; flex-direction: column; min-height: 0; }
.messages { flex: 1; overflow-y: auto; padding: 1rem; display: flex; flex-direction: column; gap: .6rem; }
.msg { max-width: 88%; padding: .55rem .8rem; border-radius: 12px; white-space: pre-wrap; }
.msg.user { align-self: flex-end; background: var(--user-bubble); }
.msg.assistant { align-self: flex-start; background: var(--bg); }
.msg.pending { color: var(--muted); font-style: italic; }
.msg.error { background: none; color: var(--error); padding-left: 0; }
.chat-form { display: flex; gap: .5rem; padding: .75rem; border-top: 1px solid var(--border); }
.chat-form textarea { resize: none; }
.examples { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: .5rem; }
.examples button { font-size: .85rem; padding: .35rem .6rem; border-radius: 999px; }

/* workout */
.workout { padding: 1.1rem; overflow-y: auto; min-height: 0; }
.empty { height: 100%; display: grid; place-items: center; text-align: center; }
.workout-head { display: flex; justify-content: space-between; gap: 1rem; align-items: flex-start; }
.workout-head p { margin: .2rem 0 0; }
.badge {
  font-size: .8rem; padding: .2rem .6rem; border-radius: 999px;
  background: var(--bg); border: 1px solid var(--border); white-space: nowrap;
}
.stats { display: flex; gap: 2rem; margin: 1rem 0; }
.stats > div { display: grid; }
.stat-label { font-size: .75rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.stat { font-size: 1.35rem; font-weight: 600; font-variant-numeric: tabular-nums; }

.chart-wrap { position: relative; }
#chart { width: 100%; height: 260px; display: block; overflow: visible; }
#chart .grid { stroke: var(--grid); stroke-width: 1; vector-effect: non-scaling-stroke; }
#chart .ftp { stroke: var(--muted); stroke-dasharray: 4 4; stroke-width: 1; vector-effect: non-scaling-stroke; }
#chart .seg { stroke: var(--surface); stroke-width: 1; vector-effect: non-scaling-stroke; }
#chart .seg:hover { filter: brightness(1.12); }
.axis { display: flex; justify-content: space-between; font-size: .75rem; color: var(--muted); margin-top: .25rem; position: relative; height: 1rem; }
.axis span { position: absolute; transform: translateX(-50%); }
.y-labels { position: absolute; inset: 0; pointer-events: none; font-size: .7rem; color: var(--muted); }
.y-labels span { position: absolute; left: 4px; transform: translateY(-110%); }
.tooltip {
  position: absolute; pointer-events: none; background: var(--text); color: var(--surface);
  font-size: .8rem; padding: .35rem .55rem; border-radius: 6px; white-space: nowrap; z-index: 2;
  transform: translate(-50%, -110%);
}
.legend { display: flex; flex-wrap: wrap; gap: .8rem; margin: .75rem 0 0; font-size: .78rem; color: var(--muted); }
.legend i { display: inline-block; width: .7rem; height: .7rem; border-radius: 2px; margin-right: .3rem; vertical-align: -1px; }
.exports { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: 1.1rem; }
.steps { margin-top: 1rem; }
.steps summary { cursor: pointer; color: var(--muted); }
.steps ol { padding-left: 1.3rem; margin: .5rem 0 0; display: grid; gap: .2rem; font-size: .9rem; }
.steps ol ol { margin-top: .2rem; }

/* import */
.import-btn { margin-top: .5rem; }
.source { margin: .35rem 0 0; color: var(--muted); }
.source code { font-size: .8rem; }
.import-dialog { padding: 1.4rem; display: grid; gap: 1.1rem; }
.import-dialog h3 { margin: 0 0 .5rem; font-size: .95rem; }
.import-dialog p { margin: 0 0 .5rem; }
.dialog-head { display: flex; justify-content: space-between; align-items: center; }
.import-list {
  list-style: none; margin: .5rem 0 0; padding: 0; max-height: 300px; overflow-y: auto;
  border: 1px solid var(--border); border-radius: 8px;
}
.import-list li { border-bottom: 1px solid var(--border); }
.import-list li:last-child { border-bottom: none; }
.import-list button {
  width: 100%; border: none; border-radius: 0; justify-content: space-between; text-align: left;
  padding: .55rem .75rem; gap: 1rem;
}
.import-list button:hover { background: var(--bg); }
.import-list .meta { color: var(--muted); font-size: .8rem; white-space: nowrap; }
.import-list .empty-row { padding: .75rem; color: var(--muted); font-size: .9rem; }
#import { width: min(520px, calc(100% - 32px)); }

/* hosting: quota, hints, admin */
.quota { margin: 0; padding: 0 .75rem .6rem; }
.hint { margin: .75rem 0 0; }
.hint code, .import-dialog code { font-size: .8rem; }
.admin { border-top: 1px solid var(--border); padding-top: 1rem; }
.admin h3 { margin: 0 0 .25rem; font-size: .95rem; }
.invite-new { display: flex; gap: .5rem; margin: .5rem 0; }
.invite-list { list-style: none; margin: 0; padding: 0; display: grid; gap: .35rem; max-height: 180px; overflow-y: auto; }
.invite-list li { display: flex; justify-content: space-between; gap: .75rem; font-size: .85rem; }
.invite-list code { font-size: .9rem; font-weight: 600; letter-spacing: .03em; }
.invite-list .used code { text-decoration: line-through; color: var(--muted); font-weight: 400; }
#restore-box { display: grid; gap: .6rem; margin-top: 1rem; }
#restore-box[hidden] { display: none; }
.restore-title { margin-top: .5rem; }
.danger-zone { margin-top: .9rem; }
.row-left { display: flex; gap: .5rem; flex-wrap: wrap; }
#zwift-folder-line code, #export-hint code { font-size: .8rem; }
.hint a { color: var(--accent); }
.danger-zone summary { cursor: pointer; color: var(--error); font-size: .9rem; }
.danger-zone[open] { display: grid; gap: .6rem; }
.danger-zone p { margin: .5rem 0 0; }
button.danger { background: var(--error); border-color: var(--error); color: #fff; justify-self: start; }
.auth-card h2 { margin: 0; }

/* tabs */
.tabs { display: flex; gap: .25rem; margin-left: 1rem; }
.tab { border: none; background: none; color: var(--muted); padding: .4rem .7rem; border-radius: 8px; }
.tab:hover { background: var(--bg); }
.tab.active { color: var(--text); background: var(--bg); font-weight: 600; }

/* readiness dashboard */
.app.view-readiness .sidebar, .app.view-readiness .main { display: none; }
.app.view-readiness #menu-btn { visibility: hidden; }
.readiness { grid-column: 1 / -1; grid-row: 2; overflow-y: auto; padding: 16px 24px 32px; min-width: 0; }
.r-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 1rem; }
.r-head h1 { margin: 0; }
.r-head p { margin: .2rem 0 0; }
.r-error { background: var(--user-bubble); border-radius: 8px; padding: .6rem .8rem; margin: 0 0 1rem; }
.r-loading { padding: 2rem 0; }
.r-top { display: grid; grid-template-columns: minmax(240px, 1fr) minmax(300px, 1.4fr) minmax(220px, 1fr); gap: 16px; }
.r-top .card, .r-acts-wrap { padding: 1.1rem; }
.r-top h2, .r-section { font-size: 1rem; margin: 0 0 .75rem; }
.r-section { margin: 1.75rem 0 .75rem; }
.r-hero { display: grid; gap: .6rem; align-content: start; }
.r-score-wrap { display: flex; align-items: baseline; gap: .25rem; }
.r-score { font-size: 3.4rem; font-weight: 700; line-height: 1; font-variant-numeric: tabular-nums; }
.r-of { color: var(--muted); font-size: 1rem; }
.r-verdict p { margin: 0 0 .25rem; }
.r-status { font-weight: 600; font-size: 1.1rem; display: flex; align-items: center; gap: .45rem; }
.r-dot { width: .8rem; height: .8rem; border-radius: 50%; display: inline-block; flex: none; }
.r-note { margin: .25rem 0 0; }
.r-suggest { justify-self: start; }
.status-ready { background: var(--good); }
.status-moderate { background: var(--warning); }
.status-easy { background: var(--serious); }
.status-recover { background: var(--critical); }

.r-parts ul { list-style: none; margin: 0; padding: 0; display: grid; gap: .7rem; }
.r-part-head { display: flex; justify-content: space-between; gap: .5rem; font-size: .9rem; }
.r-part-head span:last-child { font-variant-numeric: tabular-nums; font-weight: 600; }
.r-bar { height: 6px; background: var(--grid); border-radius: 3px; margin: .3rem 0 .2rem; overflow: hidden; }
.r-bar i { display: block; height: 100%; border-radius: 3px; background: var(--series); }
.r-part-note { font-size: .8rem; color: var(--muted); }
.r-part.missing .r-part-head span:last-child { color: var(--muted); font-weight: 400; }

.r-load-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .9rem 1rem; }
.r-load-grid div { display: grid; }
.r-load p { margin: .9rem 0 0; }

.r-trends { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.r-chart { padding: .9rem 1rem .6rem; position: relative; }
.r-chart h3 { margin: 0; font-size: .9rem; font-weight: 600; }
.r-chart .r-latest { font-size: .8rem; color: var(--muted); margin: .1rem 0 .4rem; }
.r-chart svg { width: 100%; height: auto; display: block; overflow: visible; }
.r-chart .axis-label { font-size: 9px; fill: var(--muted); }
.r-chart .gridline { stroke: var(--grid); stroke-width: 1; }
.r-chart .band { fill: var(--series); opacity: .12; }
.r-chart .line { fill: none; stroke: var(--series); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.r-chart .bar { fill: var(--series); }
.r-chart .bar.dim { opacity: .35; }
.r-chart .hover-line { stroke: var(--muted); stroke-width: 1; }
.r-chart .hover-dot { fill: var(--series); stroke: var(--surface); stroke-width: 2; }
.r-chart .tooltip { transform: translate(-50%, -115%); }

.r-acts-wrap { overflow-x: auto; }
.r-acts { width: 100%; border-collapse: collapse; font-size: .88rem; font-variant-numeric: tabular-nums; }
.r-acts th { text-align: left; font-weight: 600; color: var(--muted); font-size: .75rem; text-transform: uppercase; letter-spacing: .03em; padding: 0 .6rem .5rem 0; }
.r-acts td { padding: .45rem .6rem .45rem 0; border-top: 1px solid var(--border); white-space: nowrap; }
.r-acts td:nth-child(2) { white-space: normal; }

@media (max-width: 1100px) {
  .r-top { grid-template-columns: 1fr 1fr; }
  .r-hero { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .tabs { margin-left: .25rem; }
  .readiness { padding: 16px; }
  .r-top { grid-template-columns: 1fr; }
  .r-trends { grid-template-columns: 1fr; }
}

/* settings */
dialog {
  border: 1px solid var(--border); border-radius: var(--radius); padding: 0;
  background: var(--surface); color: var(--text); width: min(420px, calc(100% - 32px));
}
dialog::backdrop { background: rgb(0 0 0 / .4); }
.settings-form { padding: 1.4rem; display: grid; gap: .9rem; }
.settings-form p { margin: 0; }
.row { display: flex; gap: .5rem; justify-content: flex-end; }

/* small screens */
@media (max-width: 900px) {
  .app { grid-template-columns: 1fr; grid-template-areas: "top" "main"; height: auto; min-height: 100%; }
  #menu-btn { display: inline-flex; }
  .sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; width: 260px; z-index: 10;
    transform: translateX(-100%); transition: transform .2s, visibility .2s; visibility: hidden;
  }
  .sidebar.open { transform: none; visibility: visible; box-shadow: 0 0 24px rgb(0 0 0 / .2); }
  .topbar { gap: .4rem; }
  .topbar button { padding: .4rem .6rem; white-space: nowrap; }
  .brand { white-space: nowrap; }
  .main { grid-template-columns: 1fr; }
  .workout { order: -1; }
  .chat { height: 60vh; }
  .hide-sm { display: none; }
  .stats { gap: 1.25rem; }
}