/* Knurled Workbench — styled to match the iOS app's design system.
   Palette accents mirror ios/Knurled/DesignSystem/Theme.swift
   (Brass / Steel / Sage / Violet). Modern dashboard feel: soft elevation,
   light borders, generous space; the accent is reserved for active/primary. */

:root {
  color-scheme: light;
  --ink: #14171c;
  --ink-soft: #3c434c;
  --muted: #707984;
  --line: #edeff2;
  --line-strong: #dde1e6;
  --panel: #ffffff;
  --bg: #f5f6f8;
  --surface: #f3f4f6;
  --surface-2: #eceef1;
  --rail: #1a1d23; /* KnurledTheme.steelDark */
  --rail-2: #15181d;
  --rail-line: rgba(255, 255, 255, 0.07);
  --rail-ink: #aeb6c0;
  --rail-ink-dim: #7b838d;
  --green: #1f7a4d;
  --gold: #b27a1f;
  --red: #cc3845; /* iOS danger */

  --radius-card: 10px;
  --radius-ctrl: 8px;
  --radius-pill: 7px;
  --s-xs: 4px;
  --s-s: 8px;
  --s-m: 16px;
  --s-l: 24px;

  --shadow-xs: 0 1px 2px rgba(18, 24, 36, 0.05);
  --shadow-sm: 0 1px 2px rgba(18, 24, 36, 0.04), 0 1px 3px rgba(18, 24, 36, 0.07);
  --shadow-md: 0 2px 4px rgba(18, 24, 36, 0.04), 0 4px 12px rgba(18, 24, 36, 0.08);

  --accent: #6f9e6a; /* default: sage */
  --accent-ink: #ffffff;
}

:root[data-theme="sage"] {
  --accent: #6f9e6a;
  --red: #b56170;
}
:root[data-theme="steel"] {
  --accent: #4f7fe0;
  --red: #cc3845;
}
:root[data-theme="brass"] {
  --accent: #c0913f;
  --red: #cc3845;
}
:root[data-theme="violet"] {
  --accent: #9268e0;
  --red: #d9476b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 14px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, p {
  margin: 0;
}
h1 { font-size: 22px; line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; }
h2 { font-size: 18px; letter-spacing: -0.015em; font-weight: 700; }
h3 { font-size: 14px; font-weight: 650; letter-spacing: -0.005em; }
h4 { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 700; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.grow { flex: 1; }
code { font: 12px ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--muted); }

button {
  min-height: 36px;
  border: 1px solid transparent;
  border-radius: var(--radius-ctrl);
  background: var(--accent);
  color: var(--accent-ink);
  font: inherit;
  font-weight: 600;
  padding: 0 15px;
  cursor: pointer;
  box-shadow: var(--shadow-xs);
  transition: filter 0.14s ease, box-shadow 0.14s ease, transform 0.06s ease, background 0.14s ease, border-color 0.14s ease, color 0.14s ease;
}
button:hover { filter: brightness(1.06); box-shadow: var(--shadow-sm); }
button:active { transform: translateY(0.5px); filter: brightness(0.97); }
button:disabled { opacity: 0.45; cursor: not-allowed; filter: none; box-shadow: none; }
button.ghost { background: var(--panel); color: var(--ink); border-color: var(--line-strong); }
button.ghost:hover { border-color: color-mix(in srgb, var(--accent) 55%, var(--line-strong)); filter: none; background: var(--panel); }

:focus-visible { outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent); outline-offset: 2px; }

input, select, textarea {
  font: inherit;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-ctrl);
  padding: 8px 11px;
  background: var(--panel);
  color: var(--ink);
  width: 100%;
  transition: border-color 0.14s ease, box-shadow 0.14s ease;
}
input::placeholder, textarea::placeholder { color: color-mix(in srgb, var(--muted) 75%, #fff); }
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
label { display: grid; gap: 5px; font-weight: 600; font-size: 12px; color: var(--ink-soft); }

.app-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 184px minmax(0, 1fr);
}
.boot { padding: 40px; color: var(--muted); }

/* Rail */
.rail {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: var(--s-l);
  padding: 20px 14px;
  background: linear-gradient(180deg, var(--rail) 0%, var(--rail-2) 100%);
  border-right: 1px solid var(--rail-line);
  position: sticky;
  top: 0;
  height: 100vh;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 36px;
  padding: 0 6px;
  color: #f7f8fa;
  text-decoration: none;
}
.brand:hover { color: #fff; }
.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.32);
}
.brand-name {
  color: #f7f8fa;
  font-size: 15px;
  font-weight: 750;
  line-height: 1;
}
.rail nav { display: grid; gap: 2px; }
.nav-item {
  background: transparent;
  border: 0;
  color: var(--rail-ink);
  text-align: left;
  padding: 9px 12px;
  border-radius: var(--radius-ctrl);
  font-weight: 550;
  font-size: 13px;
  min-height: 36px;
  box-shadow: none;
  transition: background 0.14s ease, color 0.14s ease;
}
.nav-item:hover { background: rgba(255, 255, 255, 0.07); color: #fff; filter: none; box-shadow: none; }
.nav-item:active { transform: none; }
.nav-item.active { background: var(--accent); color: var(--accent-ink); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,0.18); }
.nav-item.active:hover { filter: brightness(1.05); }

main { min-width: 0; padding: var(--s-l) 28px 56px; }
.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--s-m);
  margin-bottom: var(--s-l);
}
.topbar p { color: var(--muted); margin-top: 4px; font-size: 13px; }
.actions { display: flex; gap: var(--s-s); }

/* Status strip — row of light metric cards */
.status-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(120px, 1fr));
  gap: var(--s-s);
  margin-bottom: var(--s-l);
}
.status-strip div {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-xs);
  padding: 12px 15px;
  min-width: 0;
}
.status-strip span { display: block; color: var(--muted); font-size: 11px; font-weight: 600; margin-bottom: 4px; }
.status-strip strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 15px; font-weight: 650; }

/* Cards & layout */
.stack { display: grid; gap: var(--s-m); }
.row { display: flex; gap: var(--s-s); align-items: end; flex-wrap: wrap; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-s); }
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: var(--panel);
  padding: var(--s-m) var(--s-l);
  box-shadow: var(--shadow-sm);
}
.card-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-s); margin-bottom: var(--s-s); }

.pill { font-size: 11px; font-weight: 700; padding: 3px 9px; border-radius: 999px; text-transform: capitalize; letter-spacing: 0.01em; }
.pill.ok { background: color-mix(in srgb, var(--green) 13%, #fff); color: var(--green); }
.pill.bad { background: color-mix(in srgb, var(--red) 13%, #fff); color: var(--red); }

.eyebrow { text-transform: uppercase; letter-spacing: 0.07em; font-size: 10px; color: var(--muted); font-weight: 700; }
.ok { color: var(--green); }
.warn { color: var(--gold); }
.bad { color: var(--red); }

/* Overview */
.hero { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--s-m); padding: var(--s-l); }
.hero h2 { margin: 8px 0 6px; font-size: 22px; }
.action-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: var(--s-m); }
.action-card {
  background: var(--panel);
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-sm);
  display: grid;
  gap: 5px;
  padding: 16px;
  text-align: left;
  min-height: 74px;
  transition: border-color 0.14s ease, box-shadow 0.14s ease, transform 0.1s ease;
}
.action-card:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); filter: none; box-shadow: var(--shadow-md); transform: translateY(-1px); }
.action-card strong { font-size: 14px; font-weight: 650; }
.action-card span { color: var(--muted); font-weight: 400; font-size: 12px; line-height: 1.4; }

/* Subtabs (editor) — connected segmented control; validation pill floats right */
.subtabs { display: flex; align-items: center; margin-bottom: var(--s-m); }
.subtabs .grow { flex: 1; }
.subtab { background: var(--surface); color: var(--muted); border: 1px solid var(--line-strong); border-left-width: 0; border-radius: 0; box-shadow: none; min-height: 34px; padding: 0 16px; font-size: 13px; font-weight: 600; }
.subtab:first-of-type { border-left-width: 1px; border-radius: var(--radius-ctrl) 0 0 var(--radius-ctrl); }
.subtab:last-of-type { border-radius: 0 var(--radius-ctrl) var(--radius-ctrl) 0; }
.subtab:hover { color: var(--ink); filter: none; box-shadow: none; background: var(--panel); }
.subtab.active { background: var(--panel); color: var(--accent); border-color: color-mix(in srgb, var(--accent) 45%, var(--line-strong)); box-shadow: var(--shadow-xs); position: relative; z-index: 1; }
.subtab.active:hover { filter: none; }

textarea#raw, #hist-text { min-height: 420px; resize: vertical; font: 13px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace; }
.editor-body { display: grid; gap: var(--s-m); }
.validation-rail { display: grid; gap: 6px; }
.msg { margin: 0; padding: 9px 12px; border-radius: var(--radius-ctrl); background: var(--surface); border: 1px solid var(--line); }
.msg.ok { background: color-mix(in srgb, var(--green) 8%, #fff); border-color: color-mix(in srgb, var(--green) 22%, var(--line)); }
.msg.bad { background: color-mix(in srgb, var(--red) 8%, #fff); border-color: color-mix(in srgb, var(--red) 22%, var(--line)); }
.msg.warn { background: color-mix(in srgb, var(--gold) 10%, #fff); border-color: color-mix(in srgb, var(--gold) 24%, var(--line)); }

.form fieldset { border: 1px solid var(--line); border-radius: var(--radius-card); padding: var(--s-m) var(--s-l); }
.form legend { font-weight: 650; padding: 0 8px; font-size: 13px; color: var(--ink); }

/* Builder */
.builder { display: grid; grid-template-columns: 256px minmax(0, 1fr); gap: var(--s-m); align-items: start; }
.palette { border: 1px solid var(--line); border-radius: var(--radius-card); padding: var(--s-s); background: var(--panel); box-shadow: var(--shadow-sm); display: flex; flex-direction: column; gap: var(--s-s); position: sticky; top: var(--s-l); max-height: calc(100vh - 200px); }
.palette-list { overflow: auto; display: grid; gap: var(--s-m); padding-right: 2px; }
.palette-group h4 { margin-bottom: 7px; }
.ex-chip {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  padding: 5px 10px;
  margin: 2px 3px 0 0;
  font-size: 12px;
  cursor: grab;
  display: inline-block;
  transition: border-color 0.12s ease, background 0.12s ease, box-shadow 0.12s ease;
}
.ex-chip:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line-strong)); background: color-mix(in srgb, var(--accent) 9%, #fff); box-shadow: var(--shadow-xs); }
.ex-chip:active { cursor: grabbing; }

.canvas { min-width: 0; }
.rotation { display: flex; gap: 6px; flex-wrap: wrap; margin: var(--s-s) 0; }
.rot-chip { background: var(--accent); color: var(--accent-ink); padding: 6px 13px; border-radius: var(--radius-pill); font-weight: 650; font-size: 12px; cursor: grab; box-shadow: var(--shadow-xs); }
.rot-chip:active { cursor: grabbing; }
.days { display: flex; gap: 6px; flex-wrap: wrap; }
.day { background: var(--panel); color: var(--muted); text-transform: uppercase; font-size: 11px; font-weight: 600; padding: 0 11px; min-height: 30px; border: 1px solid var(--line-strong); box-shadow: none; }
.day:hover { filter: none; box-shadow: none; border-color: color-mix(in srgb, var(--accent) 50%, var(--line-strong)); color: var(--ink); background: var(--panel); }
.day.on { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); box-shadow: var(--shadow-xs); }
.day.on:hover { color: var(--accent-ink); filter: brightness(1.05); }

.sessions { display: grid; grid-template-columns: repeat(auto-fill, minmax(248px, 1fr)); gap: var(--s-m); }
.session { padding: var(--s-m); }
.session h3 { margin-bottom: var(--s-s); }
.slot { display: grid; grid-template-columns: 34px 1fr; gap: var(--s-s); align-items: start; padding: 9px 0; border-top: 1px solid var(--line); }
.slot:first-of-type { border-top: 0; padding-top: 2px; }
.slot .tier { font-size: 10px; font-weight: 800; letter-spacing: 0.03em; color: var(--muted); padding-top: 9px; }
.slot.locked .slot-fixed { padding: 8px 0; font-weight: 600; }
.slot-drop { border: 1.5px dashed var(--line-strong); border-radius: var(--radius-ctrl); padding: 9px 11px; color: var(--ink); font-weight: 600; transition: border-color 0.12s ease, background 0.12s ease; }
.slot-drop.drag-over, .alt-drop.drag-over, .dropzone.drag-over { border-color: var(--accent); border-style: solid; background: color-mix(in srgb, var(--accent) 9%, #fff); color: var(--ink); }
.alts { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 7px; }
.alt-chip { display: inline-flex; align-items: center; gap: 4px; background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--radius-pill); padding: 2px 4px 2px 10px; font-size: 12px; }
.alt-chip .policy, .alt-chip .x { min-height: 20px; padding: 0 6px; border-radius: 5px; background: var(--panel); color: var(--muted); border: 1px solid var(--line-strong); font-size: 11px; box-shadow: none; }
.alt-chip .policy.progression_equivalent { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.alt-drop { border: 1.5px dashed var(--line-strong); border-radius: var(--radius-pill); padding: 3px 11px; font-size: 12px; color: var(--muted); transition: border-color 0.12s ease, color 0.12s ease; }
.alt-drop:hover { border-color: var(--accent); color: var(--ink); }

/* Patches */
.patch-row { display: grid; grid-template-columns: 44px 1fr 32px; gap: var(--s-s); align-items: start; padding: var(--s-m) 0; border-top: 1px solid var(--line); }
.patch-row:first-of-type { border-top: 0; }
.patch-text { font: 12px ui-monospace, Menlo, monospace; background: var(--surface); padding: 9px 11px; border: 1px solid var(--line); border-radius: var(--radius-ctrl); white-space: pre-wrap; margin: 7px 0 0; color: var(--ink-soft); }
.x { background: var(--panel); color: var(--red); border: 1px solid var(--line-strong); min-height: 28px; padding: 0 8px; box-shadow: none; }
.x:hover { filter: none; box-shadow: none; border-color: var(--red); background: color-mix(in srgb, var(--red) 8%, #fff); }
.switch { position: relative; display: inline-block; width: 40px; height: 24px; }
.switch input { display: none; }
.switch span { position: absolute; inset: 0; background: var(--line-strong); border-radius: 999px; transition: 0.18s; cursor: pointer; }
.switch span::after { content: ""; position: absolute; width: 18px; height: 18px; left: 3px; top: 3px; background: #fff; border-radius: 50%; transition: 0.18s; box-shadow: 0 1px 2px rgba(0,0,0,0.22); }
.switch input:checked + span { background: var(--accent); }
.switch input:checked + span::after { transform: translateX(16px); }

/* Next session */
.session-render { display: grid; gap: var(--s-m); }
.session-head { display: flex; align-items: baseline; gap: var(--s-s); }
.exercise-card { border: 1px solid var(--line); border-radius: var(--radius-card); background: var(--panel); padding: var(--s-m) var(--s-l); box-shadow: var(--shadow-sm); }
.exercise-card header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--s-s); }
.lane { font: 11px ui-monospace, Menlo, monospace; color: var(--muted); background: var(--surface); padding: 2px 7px; border-radius: 6px; }
.sets { display: grid; gap: 5px; }
.set { display: grid; grid-template-columns: 28px 1fr 1fr; gap: var(--s-s); padding: 8px 11px; background: var(--surface); border-radius: var(--radius-ctrl); }
.set-n { font-weight: 700; color: var(--muted); }
.rest { color: var(--muted); margin-top: var(--s-s); font-size: 12px; }

/* Charts */
.chart { display: block; height: 220px; }
.chart-grid { stroke: var(--line); stroke-width: 1; }
.chart-axis { fill: var(--muted); font-size: 9px; }
.chart-legend { display: flex; gap: var(--s-m); flex-wrap: wrap; margin-top: var(--s-s); font-size: 12px; color: var(--muted); }
.chart-legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }

/* Timeline / kv / json */
.timeline { display: grid; gap: 2px; max-height: 360px; overflow: auto; }
.tl-row { display: grid; grid-template-columns: 28px 1fr auto; gap: var(--s-s); padding: 8px 10px; border-radius: var(--radius-ctrl); align-items: center; }
.tl-row:nth-child(odd) { background: var(--surface); }
.tl-n { color: var(--muted); font-weight: 700; }
.import-preview { gap: 4px; }
.import-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: var(--s-m);
  padding: 10px 12px;
  border-radius: var(--radius-ctrl);
  align-items: center;
}
.import-row:nth-child(odd) { background: var(--surface); }
.import-main {
  display: flex;
  align-items: baseline;
  gap: var(--s-s);
  min-width: 0;
}
.import-row strong,
.import-row span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.import-detail {
  grid-column: 1 / -1;
  color: var(--ink-soft);
  font: 12px ui-monospace, Menlo, monospace;
}
.kv { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--s-s); }
.kv div { background: var(--surface); padding: 11px 13px; border-radius: var(--radius-ctrl); }
.kv span { display: block; color: var(--muted); font-size: 11px; font-weight: 600; margin-bottom: 3px; }
.json { font: 12px/1.55 ui-monospace, Menlo, monospace; background: var(--surface); padding: var(--s-m); border: 1px solid var(--line); border-radius: var(--radius-ctrl); max-height: 400px; overflow: auto; white-space: pre-wrap; color: var(--ink-soft); }

/* History */
.dropzone { border: 1.5px dashed var(--line-strong); border-radius: var(--radius-card); padding: 22px; text-align: center; color: var(--muted); margin-bottom: var(--s-s); transition: border-color 0.12s ease, background 0.12s ease; }

/* Themes picker */
.themes { display: flex; gap: var(--s-s); flex-wrap: wrap; }
.theme-chip { background: var(--panel); color: var(--ink); display: inline-flex; align-items: center; gap: 8px; border: 1px solid var(--line-strong); }
.theme-chip:hover { filter: none; border-color: color-mix(in srgb, var(--accent) 50%, var(--line-strong)); }
.theme-chip.active { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent); }
.sw { width: 14px; height: 14px; border-radius: 4px; display: inline-block; }
.sw-sage { background: #6f9e6a; }
.sw-steel { background: #4f7fe0; }
.sw-brass { background: #c0913f; }
.sw-violet { background: #9268e0; }

@media (max-width: 920px) {
  .app-shell { grid-template-columns: 1fr; }
  .rail { flex-direction: row; align-items: center; gap: var(--s-s); padding: 8px 14px; position: static; height: auto; border-right: 0; border-bottom: 1px solid var(--rail-line); background: var(--rail); }
  .brand { padding: 0 2px; }
  .brand-mark { width: 28px; height: 28px; }
  .brand-name { font-size: 14px; }
  .rail nav { display: flex; flex-wrap: wrap; }
  main { padding: var(--s-m) var(--s-m) 40px; }
  .status-strip, .builder, .sessions, .grid2, .kv { grid-template-columns: 1fr; }
  .palette { position: static; max-height: none; }
}