:root {
  --bg: #F5EEE1;
  --panel: #F5EEE1;
  --panel-2: #c0564a;
  --line: #D8A068;
  --text: #0F202E;
  --muted: #0F202E;
  --accent: #0F202E;
  --accent-2: #D8A068;
  --danger: #b33a3a;
  --shadow: rgba(15, 32, 46, 0.18);
}

* { box-sizing: border-box; }

.tips {
  display: block;
  border: 1px solid var(--line);
  border-radius: 5px;
  left: 0;
  top: 5rem;
  position: absolute;
  padding: 1rem;
  max-width: 15rem;
  color: var(--text);
  user-select: none;
}

.tips h3 {
  margin: 0 0 0.75rem;
  font-size: 1.1rem;
}

.tips ul + h3 {
  margin-top: 1rem;
}

.tips ul {
  margin: 0;
  padding-left: 1.25rem;
}

.tips p {
  margin: 1rem 0 0;
  font-style: italic;
}

.tips.tips-hidden {
  display: none;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  justify-content: center;
  padding: 28px 18px 48px;
}

.app {
  width: min(980px, 100%);
  background: rgba(245, 238, 225, 0.2);
  border: 2px solid var(--line);
  border-radius: 10px;
  box-shadow: 5px 5px 10px var(--shadow);
  padding: 24px 20px 18px;
  margin-top: 5rem;
}

h1 {
  position: fixed;
  left: 0;
  top: 0;
  margin: 0;
  padding: 1rem;
  border: 0.2rem solid var(--accent-2);
  background-color: var(--accent);
  color: var(--bg);
  font-family: "Playfair Display", serif;
  font-size: clamp(24px, 2vw, 32px);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: none;
  text-align: left;
  border-radius: 0 0 15px 0;
  z-index: 9;
}

.controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  align-items: end;
  margin-bottom: 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
}

label {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

input[type="text"] {
  width: 100%;
  background: var(--accent-2);
  color: var(--text);
  border: 0.25vh solid transparent;
  border-bottom: 0.25vh solid var(--accent);
  border-radius: 0;
  padding: 12px 14px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.12s ease, box-shadow 0.12s ease, background-color 0.12s ease;
}

input[type="text"]::placeholder {
  color: #4A4A4A;
}

input[type="text"]:focus {
  border-color: var(--accent);
  border-bottom-color: var(--accent);
  box-shadow: none;
}

input[type="text"].invalid {
  border-color: var(--danger);
  border-bottom-color: var(--danger);
  box-shadow: none;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 24px;
  padding: 0;
  font-size: 12px;
  color: var(--text);
  background: transparent;
  border: none;
  border-radius: 0;
  font-weight: 400;
}

.checkbox-row input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent-2);
  flex-shrink: 0;
}

.go-btn,
.delete-btn,
.clear-btn {
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  transition: background-color 0.12s ease, color 0.12s ease, transform 0.12s ease;
  font-weight: 700;
  font-family: Arial, Helvetica, sans-serif;
}

.go-btn {
  background-color: var(--accent-2);
  color: var(--text);
  font-family: "Playfair Display", serif;
  font-size: 1rem;
  border-radius: 5px;
  cursor: pointer;
  border: 0.25vh solid var(--accent-2);
  transition-duration: 150ms;
  padding: 0.75rem 1rem;
  min-height: 49px;
}

.go-btn:hover,
.go-btn:focus {
  background-color: var(--bg);
  color: var(--text);
}

.go-btn:hover,
.delete-btn:hover,
.clear-btn:hover {
  transform: translateY(-1px);
}

.result {
  margin: 20px 0 24px;
  background: rgba(216, 160, 104, 0.12);
  border: 1px solid rgba(15, 32, 46, 0.7);
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 18px;
  min-height: 56px;
  display: flex;
  align-items: center;
}

.result .value {
  font-weight: 700;
  color: var(--accent);
  margin-left: 8px;
}

.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 10px 0 12px;
  gap: 12px;
}

.history-header h2 {
  margin: 0;
  font-size: 18px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: bold;
}

.clear-btn {
  background: rgba(179, 58, 58, 0.08);
  color: var(--danger);
  border-color: rgba(179, 58, 58, 0.5);
  padding: 9px 12px;
  font-size: 13px;
}

.table-wrap {
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(245, 238, 225, 0.2);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 520px;
}

th, td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: middle;
}

th {
  background: rgba(216, 160, 104, 0.12);
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 700;
}

td {
  color: var(--text);
  font-size: 15px;
  background: rgba(245, 238, 225, 0.08);
}

tbody tr:last-child td {
  border-bottom: none;
}

.delete-btn {
  background: rgba(179, 58, 58, 0.08);
  color: var(--danger);
  border-color: rgba(179, 58, 58, 0.5);
  padding: 7px 10px;
  font-size: 12px;
}

.empty {
  padding: 18px 16px;
  color: var(--muted);
  font-size: 15px;
}

@media (max-width: 760px) {
  .controls {
    grid-template-columns: 1fr;
  }

  .history-header {
    display: block;
  }

  .clear-btn {
    margin-top: 12px;
  }
}