:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-2: #f5f6f8;
  --ink: #15171c;
  --ink-2: #454b56;
  --muted: #9096a1;
  --border: #e6e8ec;
  --hairline: #eef0f3;
  --accent: #12855a;
  --accent-strong: #0e6b48;
  --accent-tint: #eaf4ef;
  --danger: #c8443a;
  --radius: 16px;
  --radius-sm: 11px;
  --radius-lg: 20px;
  --tabbar-h: 3.75rem;
  --shadow-sm: 0 1px 2px rgba(20, 23, 28, 0.05);
  --shadow: 0 6px 22px rgba(20, 23, 28, 0.08);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

main {
  max-width: 560px;
  margin: 0 auto;
  padding: 1.1rem 1.15rem calc(var(--tabbar-h) + env(safe-area-inset-bottom) + 1.5rem);
}

h1 { font-size: 1.6rem; font-weight: 750; margin: 0.1rem 0 1.1rem; letter-spacing: -0.03em; }
h2 { font-size: 0.72rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); margin: 1.6rem 0 0.6rem; }
h3 { font-size: 1.05rem; font-weight: 650; margin: 0; letter-spacing: -0.01em; }
a { color: var(--accent-strong); }
.muted { color: var(--muted); }
.subtitle { color: var(--muted); font-size: 0.92rem; margin: 0.15rem 0 1.1rem; }

/* top bar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 0.5rem;
  min-height: 3.1rem;
  padding: 0.55rem 1.15rem;
  padding-top: calc(0.55rem + env(safe-area-inset-top));
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(1.6) blur(14px);
  border-bottom: 1px solid var(--hairline);
}
.topbar .title { font-weight: 700; font-size: 1.06rem; letter-spacing: -0.02em; }
.topbar .back {
  display: inline-flex; align-items: center;
  color: var(--accent-strong); text-decoration: none; font-size: 1rem; font-weight: 550;
  margin-left: -0.35rem;
}
.topbar .back::before { content: "‹"; font-size: 1.55rem; line-height: 1; margin-right: 0.1rem; }
.topbar .action { margin-left: auto; color: var(--accent-strong); text-decoration: none; font-weight: 600; font-size: 0.95rem; }

/* bottom tab bar */
.tabbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  display: flex;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.6) blur(16px);
  border-top: 1px solid var(--hairline);
  padding-bottom: env(safe-area-inset-bottom);
}
.tab {
  position: relative;
  flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.15rem;
  height: var(--tabbar-h);
  text-decoration: none;
  color: var(--muted);
  font-size: 0.66rem; font-weight: 600; letter-spacing: 0.01em;
}
.tab .ic { width: 23px; height: 23px; }
.tab span:last-child { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.tab.active { color: var(--accent-strong); }
.tab.active::before {
  content: ""; position: absolute; top: 0; width: 26px; height: 3px;
  background: var(--accent); border-radius: 0 0 3px 3px;
}

/* buttons */
a.button, button, input[type="submit"] {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.4rem;
  padding: 0.62rem 1.05rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  font-size: 0.98rem; font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: transform 0.05s ease, filter 0.15s ease;
}
a.button:active, button:active { transform: translateY(1px); }
button:hover, a.button:hover, input[type="submit"]:hover { filter: brightness(1.05); }
a.button.secondary, button.secondary { background: var(--surface); color: var(--ink); border-color: var(--border); box-shadow: none; }
button.danger, a.button.danger { background: transparent; border-color: color-mix(in srgb, var(--danger) 35%, transparent); color: var(--danger); box-shadow: none; }
button:disabled { opacity: 0.3; cursor: default; }

/* messages */
ul.messages { list-style: none; padding: 0; margin: 0 0 0.9rem; }
.message { padding: 0.6rem 0.8rem; border-radius: var(--radius-sm); margin-bottom: 0.4rem; font-size: 0.92rem; box-shadow: var(--shadow-sm); }
.message.error { background: color-mix(in srgb, var(--danger) 10%, var(--surface)); color: var(--danger); }
.message.success { background: var(--accent-tint); color: var(--accent-strong); }

.page-head { display: flex; justify-content: space-between; align-items: center; }

/* list rows */
.session-card {
  display: flex; flex-direction: column;
  padding: 0.85rem 0.9rem;
  margin-bottom: 0.55rem;
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  text-decoration: none; color: inherit;
  position: relative;
}
.session-card .date { font-weight: 650; letter-spacing: -0.01em; }
.session-card .summary { color: var(--muted); font-size: 0.87rem; margin-top: 0.2rem; padding-right: 1rem; }
.session-card::after { content: "›"; position: absolute; right: 0.85rem; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: 1.35rem; }

/* profile picker */
.who-picker { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; margin: 1.3rem 0; }
.who-btn {
  padding: 1.5rem 0.5rem; font-size: 1.2rem; font-weight: 650;
  background: var(--surface); color: var(--ink);
  border: 1.5px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow-sm);
}
.who-btn.active { border-color: var(--accent); background: var(--accent-tint); color: var(--accent-strong); box-shadow: none; }

.style-picker { display: flex; gap: 0.6rem; margin: 0.5rem 0; }
.style-btn {
  flex: 1; background: var(--surface); color: var(--ink);
  border: 1.5px solid var(--border); border-radius: var(--radius-sm); padding: 0.75rem; box-shadow: none;
}
.style-btn.active { border-color: var(--accent); background: var(--accent-tint); color: var(--accent-strong); }

/* home day buttons */
.day-buttons { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 0.6rem; margin-bottom: min(27vh, 14rem); }
.day-button {
  position: relative;
  justify-content: center; align-items: center;
  min-height: 5.5rem; padding: 1rem 0.5rem;
  font-size: 1.08rem; font-weight: 650; letter-spacing: -0.01em;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm);
}
.day-button::before { content: ""; position: absolute; top: 0.85rem; left: 50%; transform: translateX(-50%); width: 8px; height: 8px; border-radius: 50%; background: var(--accent); }

/* log screen */
.log-datebar { display: flex; align-items: center; gap: 0.7rem; margin-bottom: 1.1rem; }
.date-field { display: flex; align-items: center; gap: 0.5rem; font-size: 0.85rem; color: var(--muted); }
.date-field input { padding: 0.45rem 0.6rem; border: 1px solid var(--border); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); font-size: 0.95rem; }
.date-flag { font-size: 0.68rem; font-weight: 800; text-transform: uppercase; letter-spacing: 0.06em; padding: 0.2rem 0.5rem; border-radius: 6px; }
.date-flag.today { color: var(--accent-strong); background: var(--accent-tint); }
.date-flag.past { color: #9a6b12; background: #fbf1dd; }

.log-exercise { padding: 1.05rem 0 1.15rem; border-bottom: 1px solid var(--hairline); }
.log-head { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; }
.log-head .ex-name { font-weight: 650; font-size: 1.08rem; letter-spacing: -0.01em; text-decoration: none; color: var(--ink); }
.log-head .head-right { display: inline-flex; align-items: center; gap: 0.5rem; }
.log-head .chart-link { color: var(--muted); text-decoration: none; font-size: 1.05rem; }
.save-status { font-size: 0.72rem; font-weight: 700; white-space: nowrap; }
.save-status.saved { color: var(--accent-strong); }
.save-status.saving, .save-status.unsaved { color: var(--muted); }
.save-status.error { color: var(--danger); }

/* delete-day inline confirm */
.confirm-del > summary { list-style: none; cursor: pointer; color: var(--danger); font-size: 0.85rem; font-weight: 600; }
.confirm-del > summary::-webkit-details-marker { display: none; }
.confirm-del form { display: flex; flex-direction: column; align-items: flex-end; gap: 0.4rem; margin-top: 0.5rem; }
.confirm-del .confirm-q { font-size: 0.82rem; color: var(--muted); text-align: right; }
.confirm-del button.danger { padding: 0.4rem 0.8rem; font-size: 0.88rem; }
.settings-chip {
  display: inline-block; margin-top: 0.45rem;
  font-size: 0.8rem; color: var(--ink-2);
  background: var(--surface-2); border-radius: 7px; padding: 0.18rem 0.5rem;
}

/* prominent "last time" */
.last-box {
  display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.45rem;
  margin: 0.6rem 0;
  padding: 0.55rem 0.7rem;
  background: var(--surface-2);
  border-radius: var(--radius-sm);
}
.last-box .last-label { font-size: 0.6rem; font-weight: 800; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.last-box .last-value { font-weight: 700; font-size: 1.05rem; color: var(--ink); font-variant-numeric: tabular-nums; }
.last-box .last-note { color: var(--muted); font-weight: 500; font-size: 0.85rem; }
.last-box.empty .last-value { color: var(--muted); font-weight: 500; font-size: 0.9rem; }

input.shorthand {
  width: 100%; margin-top: 0.15rem;
  padding: 0.72rem 0.8rem;
  font-size: 1.1rem;
  border: 1.5px solid var(--border); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--ink);
  font-variant-numeric: tabular-nums;
  transition: border-color 0.12s ease, box-shadow 0.12s ease;
}
input.shorthand:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3.5px var(--accent-tint); }
.preview { margin-top: 0.45rem; font-size: 0.92rem; min-height: 1.1rem; }
.preview-ok { color: var(--accent-strong); font-weight: 650; }
.preview-note { color: var(--muted); }
.preview-warn { color: var(--danger); font-weight: 600; }

.log-actions { display: flex; gap: 0.6rem; margin-top: 1.5rem; }
.log-actions button[type="submit"] { flex: 1; padding: 0.95rem; font-size: 1.05rem; }

.cheatsheet { margin-top: 1.8rem; font-size: 0.9rem; }
.cheatsheet summary { cursor: pointer; color: var(--accent-strong); font-weight: 600; }
.cheatsheet ul { padding-left: 1.1rem; color: var(--muted); }
code { background: var(--surface-2); padding: 0.05rem 0.32rem; border-radius: 6px; font-size: 0.9em; }

/* session + history, notes-style */
.exercise-block { padding: 0.85rem 0; border-bottom: 1px solid var(--hairline); }
.exercise-block h3 a { color: var(--ink); text-decoration: none; }

ul.dots { list-style: none; padding: 0; margin: 0.4rem 0 0; }
ul.dots li { position: relative; padding-left: 1.2rem; margin: 0.22rem 0; font-size: 1.05rem; font-variant-numeric: tabular-nums; }
ul.dots li::before { content: "•"; position: absolute; left: 0.25rem; color: var(--accent); font-weight: 700; }
ul.dots li .li-date { font-weight: 650; color: var(--ink); text-decoration: none; }
ul.dots li .li-note { color: var(--muted); font-weight: 500; font-size: 0.9rem; }

.set-summary { font-size: 1.1rem; font-weight: 600; font-variant-numeric: tabular-nums; margin: 0.35rem 0 0.1rem; }
.note { font-size: 0.9rem; color: var(--muted); }
.raw { font-size: 0.76rem; margin-top: 0.3rem; color: var(--muted); }
.hist-date { font-weight: 650; text-decoration: none; color: var(--accent-strong); font-size: 0.9rem; }
.danger-form { margin-top: 1.6rem; }

/* exercise detail: stats + chart */
.stat-row { display: flex; gap: 0.6rem; margin: 0.5rem 0; }
.stat { flex: 1; background: var(--surface-2); border-radius: var(--radius); padding: 0.7rem 0.85rem; }
.stat .k { font-size: 0.64rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 700; }
.stat .v { font-size: 1.5rem; font-weight: 750; margin-top: 0.15rem; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }

.chart { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.85rem 0.9rem 0.6rem; margin: 0.7rem 0; box-shadow: var(--shadow-sm); }
.chart .chart-title { font-size: 0.64rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); font-weight: 700; margin-bottom: 0.35rem; }
.chart svg { display: block; width: 100%; height: auto; overflow: visible; }
.chart .pt-label { fill: var(--ink); font-size: 9px; font-weight: 700; }
.chart .grid { stroke: var(--hairline); stroke-width: 1; }
.chart .axis { stroke: var(--border); stroke-width: 1; }
.chart .axis-label { fill: var(--muted); font-size: 8px; font-variant-numeric: tabular-nums; }
.chart-hint { text-align: center; font-size: 0.7rem; margin-top: 0.3rem; }
.chart-tip {
  position: absolute; transform: translate(-50%, -125%);
  background: var(--ink); color: #fff;
  padding: 0.28rem 0.55rem; border-radius: 8px;
  font-size: 0.78rem; font-weight: 600; white-space: nowrap;
  pointer-events: none; z-index: 5; box-shadow: var(--shadow);
}

.tag { font-size: 0.68rem; color: var(--muted); border: 1px solid var(--border); border-radius: 6px; padding: 0.05rem 0.35rem; margin-left: 0.3rem; }
.pbs { display: flex; gap: 1rem; flex-wrap: wrap; }
.pb { font-weight: 650; color: var(--accent-strong); }

/* manage — notes-style indented hierarchy */
.manage-day { margin-top: 1.9rem; }
.manage-day-head { display: flex; justify-content: space-between; align-items: baseline; }
.manage-day h2 { font-size: 1.18rem; font-weight: 700; text-transform: none; letter-spacing: -0.02em; color: var(--ink); margin: 0; }
.manage-ex-list { margin: 0.4rem 0 0 0.4rem; padding-left: 1rem; border-left: 2px solid var(--hairline); }
.manage-ex { border-bottom: 1px solid var(--hairline); }
.manage-ex:last-child { border-bottom: none; }
.manage-ex-row { display: flex; justify-content: space-between; align-items: center; gap: 0.5rem; padding: 0.75rem 0.15rem; cursor: pointer; list-style: none; }
.manage-ex-row::-webkit-details-marker { display: none; }
.manage-ex-name { font-size: 1rem; font-weight: 550; }
.manage-ex-name::before { content: "•"; color: var(--accent); font-weight: 700; margin-right: 0.55rem; }
.edit-cue { display: inline-flex; align-items: center; gap: 0.15rem; color: var(--muted); font-size: 0.85rem; font-weight: 600; white-space: nowrap; }
.edit-cue::after { content: "›"; font-size: 1.15rem; line-height: 1; transition: transform 0.15s ease; }
details.manage-ex[open] .edit-cue::after { transform: rotate(90deg); }
.manage-ex-body { padding: 0 0.15rem 0.75rem 1.1rem; }
.manage-ex-controls { display: flex; gap: 0.4rem; margin-bottom: 0.4rem; }
.manage-ex-controls button { background: var(--surface-2); color: var(--ink); border: 1px solid var(--border); padding: 0.4rem 0.7rem; border-radius: 9px; font-size: 0.85rem; box-shadow: none; }
.add-ex { margin: 0.6rem 0 0.3rem; }
.add-ex summary { cursor: pointer; color: var(--accent-strong); font-size: 0.9rem; font-weight: 600; padding: 0.35rem 0; list-style: none; }
.add-ex summary::-webkit-details-marker { display: none; }

.edit-form { display: flex; flex-direction: column; gap: 0.6rem; padding: 0.65rem 0; max-width: 26rem; }
.edit-form input[type="text"], .edit-form select { padding: 0.58rem 0.65rem; border: 1px solid var(--border); border-radius: var(--radius-sm); font-size: 1rem; width: 100%; background: var(--surface); color: var(--ink); }
.edit-form .fld { display: flex; flex-direction: column; gap: 0.2rem; font-size: 0.85rem; color: var(--muted); }
.edit-form .fld-hint { font-size: 0.75rem; color: var(--muted); }
.edit-form .chk { display: flex; align-items: center; gap: 0.4rem; font-size: 0.92rem; color: var(--ink); }
.edit-form .chk input { width: auto; }
.edit-form .sel { display: flex; flex-direction: column; gap: 0.2rem; font-size: 0.82rem; color: var(--muted); }
.edit-actions { display: flex; gap: 0.5rem; }
.link-danger { background: none; border: none; color: var(--danger); font-size: 0.82rem; padding: 0; cursor: pointer; box-shadow: none; }
.inline-form { display: inline; }

.empty-hint { text-align: center; color: var(--muted); padding: 2rem 1rem; }