:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --ink: #1c1a16;
  --muted: #625d52;
  --line: #ded5c3;
  --brand: #0f766e;
  --brand-strong: #115e59;
  --accent: #d97706;
  --ring: #7dd3fc;
  --radius: 14px;
  --shadow: 0 12px 26px rgba(15, 23, 42, 0.07);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% -5%, rgba(15, 118, 110, 0.17), transparent 35%),
    radial-gradient(circle at 92% 0%, rgba(217, 119, 6, 0.16), transparent 40%),
    var(--bg);
}

.app {
  max-width: 920px;
  margin: 0 auto;
  padding: 18px 14px 46px;
  display: grid;
  gap: 12px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  animation: fadeIn 220ms ease;
}

.hero {
  background: linear-gradient(135deg, #0f766e, #115e59 45%, #12424f);
  color: #f8fafc;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.88;
}

h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.2rem);
}

h2 {
  margin: 0 0 10px;
  font-size: 1.16rem;
}

h3 {
  margin: 0;
  font-size: 1.02rem;
}

.subtext,
.small {
  margin: 8px 0 0;
  color: var(--muted);
}

.hero .subtext {
  color: rgba(248, 250, 252, 0.9);
}

.hero-status {
  color: rgba(248, 250, 252, 0.85);
}

.day-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 12px;
}

.day-tabs button {
  border: 1px solid #d8d0be;
  border-radius: 10px;
  background: #fff;
  padding: 10px 8px;
  font-weight: 700;
  cursor: pointer;
}

.day-tabs button.active {
  border-color: transparent;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #fff;
}

.exercise-preview {
  margin: 10px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.exercise-preview li {
  border: 1px solid #e5ddca;
  border-radius: 10px;
  padding: 9px 11px;
  background: #fffdf9;
  display: flex;
  justify-content: space-between;
  gap: 10px;
}

.target {
  color: var(--muted);
  font-size: 0.9rem;
}

.session-meta {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 10px;
  margin-bottom: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 0.92rem;
}

input,
button {
  font: inherit;
}

input {
  border: 1px solid #d9cfbc;
  border-radius: 10px;
  padding: 10px 11px;
}

input:focus {
  outline: 2px solid var(--ring);
  outline-offset: 1px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

th,
td {
  border-bottom: 1px solid #ece3d1;
  padding: 10px 8px;
  text-align: left;
  vertical-align: middle;
}

th {
  font-size: 0.86rem;
  color: #4d483f;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

td:first-child {
  width: 52%;
}

td input {
  width: 100%;
}

button[type="submit"] {
  margin-top: 12px;
  border: none;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--brand), var(--brand-strong));
  color: #fff;
  font-weight: 700;
  padding: 10px 14px;
  cursor: pointer;
}

#saveMessage {
  min-height: 1.2em;
}

.snapshot-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.snapshot-item {
  border: 1px solid #e3dac8;
  border-radius: 10px;
  padding: 10px;
  background: #fffdfa;
}

.snapshot-item .latest {
  margin: 8px 0 4px;
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

#sessionHistory {
  display: grid;
  gap: 8px;
}

.history-item {
  border: 1px solid #e6ddcb;
  border-radius: 10px;
  padding: 12px;
  background: #fffdf8;
}

.history-item header {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: baseline;
}

.session-date {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.session-entries {
  margin: 8px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 4px;
}

.session-note {
  margin: 8px 0 0;
}

.more summary {
  cursor: pointer;
  font-weight: 700;
}

a {
  color: var(--brand-strong);
}

a:hover {
  text-decoration: none;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 760px) {
  .app {
    padding: 12px 10px 36px;
  }

  .session-meta,
  .day-tabs,
  .snapshot-grid {
    grid-template-columns: 1fr;
  }
}