:root {
  --bg: #f3f5ee;
  --ink: #103038;
  --ink-soft: #4a6568;
  --panel: #ffffffde;
  --line: #cfe2d8;
  --accent: #0f6b5f;
  --accent-2: #ef6a3b;
  --danger: #b3283f;
  --good: #0d7a58;
  --shadow: 0 10px 40px rgba(16, 48, 56, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", "Avenir Next", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 0% 0%, #fff6e5 0%, transparent 50%),
    radial-gradient(circle at 100% 0%, #e7f6f2 0%, transparent 42%),
    linear-gradient(160deg, #f8faf4 0%, #eef4ea 100%);
}

.shell {
  max-width: 1060px;
  margin: 0 auto;
  padding: 1rem;
}

.topbar {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  padding: 1rem;
  margin-bottom: 1rem;
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: linear-gradient(135deg, #ffffff, #f5fbf8);
  box-shadow: var(--shadow);
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.3rem, 4vw, 2rem);
}

.brand p {
  margin: 0.2rem 0 0;
  color: var(--ink-soft);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tab {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  font: inherit;
  color: var(--ink);
  cursor: pointer;
}

.tab.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.flash {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  border-radius: 0.75rem;
  border: 1px solid;
  padding: 0.7rem 0.9rem;
  margin-bottom: 1rem;
}

.flash-success {
  border-color: #9ad8be;
  background: #ecfbf4;
}

.flash-error {
  border-color: #efafba;
  background: #fff2f4;
}

.flash p {
  margin: 0;
}

.content {
  display: grid;
  gap: 1rem;
}

.stack {
  display: grid;
  gap: 1rem;
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 1rem;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1rem;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

.panel h2 {
  margin: 0 0 0.6rem;
  font-size: 1.03rem;
}

.panel-wide {
  grid-column: 1 / -1;
}

.metric {
  margin: 0;
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 700;
}

.metric.positive {
  color: var(--good);
}

.metric.negative {
  color: var(--danger);
}

.timer {
  font-family: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: clamp(1.2rem, 4vw, 2rem);
  margin: 0.25rem 0;
}

.muted {
  margin: 0.2rem 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.form,
.field,
.row-2,
.row-3,
.row-wrap,
.actions {
  display: grid;
  gap: 0.65rem;
}

.row-wrap {
  grid-template-columns: 1fr;
  align-items: center;
}

.row-2,
.row-3 {
  grid-template-columns: 1fr;
}

.field span {
  font-size: 0.86rem;
  color: var(--ink-soft);
}

.field input,
.field select,
.field textarea,
#history-import-policy {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.65rem;
  padding: 0.55rem 0.7rem;
  font: inherit;
  background: #fff;
  color: var(--ink);
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.button,
.ghost {
  border-radius: 0.65rem;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  padding: 0.45rem 0.7rem;
  cursor: pointer;
}

.button.strong {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.button.danger {
  border-color: #f0bdc7;
  color: var(--danger);
  background: #fff;
}

.button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.ghost {
  border-color: transparent;
  background: transparent;
  color: var(--ink-soft);
  padding: 0;
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.list li {
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: #fff;
  padding: 0.7rem;
  display: grid;
  gap: 0.5rem;
}

.list p {
  margin: 0;
}

.session-box {
  border: 1px dashed var(--line);
  border-radius: 0.75rem;
  padding: 0.75rem;
  display: grid;
  gap: 0.6rem;
}

code {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.88em;
}

@media (min-width: 760px) {
  .shell {
    padding: 1.3rem;
  }

  .topbar {
    grid-template-columns: 1fr auto;
    align-items: end;
  }

  .panel-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .row-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .row-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .row-wrap {
    grid-template-columns: auto 1fr;
    gap: 1rem;
  }

  .list li {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.5rem;
  }
}