:root {
  --bg: #f2f0ea;
  --card-bg: #ffffff;
  --ink: #1d1d1f;
  --accent: #2563eb;
  --accent-ink: #ffffff;
  --border: 3px solid var(--ink);
  --shadow: 6px 6px 0 var(--ink);
  --negative: #dc2626;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.container {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 {
  font-size: 2.25rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-align: center;
  margin: 0 0 1.5rem;
}

h2 {
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 1.25rem;
  border-bottom: var(--border);
  padding-bottom: 0.5rem;
}

.card {
  background: var(--card-bg);
  border: var(--border);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 2.5rem;
}

.field-group {
  margin-bottom: 1.25rem;
}

.group-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.time-row,
.adjust-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Medium-size, blocky inputs */
.time-input {
  width: 5rem;
  height: 3.25rem;
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  border: var(--border);
  border-radius: 0;
  background: var(--card-bg);
  color: var(--ink);
  -moz-appearance: textfield;
  appearance: textfield;
}

.time-input::-webkit-outer-spin-button,
.time-input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.time-input:focus {
  outline: none;
  background: #eef2ff;
  box-shadow: 4px 4px 0 var(--accent);
}

.colon {
  font-size: 1.75rem;
  font-weight: 700;
}

.ampm-toggle,
.op-toggle {
  display: inline-flex;
  border: var(--border);
}

.ampm-btn,
.op-btn {
  height: 3.25rem;
  min-width: 3.25rem;
  padding: 0 0.75rem;
  font-size: 1.1rem;
  font-weight: 700;
  font-family: inherit;
  border: none;
  border-radius: 0;
  background: var(--card-bg);
  color: var(--ink);
  cursor: pointer;
}

.ampm-btn + .ampm-btn,
.op-btn + .op-btn {
  border-left: var(--border);
}

.ampm-btn.active,
.op-btn.active {
  background: var(--ink);
  color: var(--accent-ink);
}

.op-btn {
  font-size: 1.5rem;
}

.labeled-input {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
}

.unit {
  font-size: 0.9rem;
  font-weight: 700;
  text-transform: uppercase;
}

.result {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  border: var(--border);
  background: var(--bg);
}

.result-label {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.result-value {
  font-size: 1.75rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.result-value.negative {
  color: var(--negative);
}

.result-note {
  font-size: 0.9rem;
  font-weight: 600;
}