:root {
  --ink: #182018;
  --muted: #687064;
  --paper: #f8f3e8;
  --card: rgba(255, 252, 244, 0.86);
  --line: rgba(24, 32, 24, 0.14);
  --accent: #d85d27;
  --accent-dark: #873817;
  --ok: #1f7a4d;
  --bad: #b7372f;
  --shadow: 0 24px 80px rgba(58, 47, 31, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", "Yu Mincho", "Noto Serif TC", serif;
  background:
    radial-gradient(circle at 14% 8%, rgba(216, 93, 39, 0.24), transparent 28rem),
    radial-gradient(circle at 86% 12%, rgba(44, 92, 72, 0.16), transparent 26rem),
    linear-gradient(135deg, #f7efdf 0%, #efe3cf 46%, #f9f6ec 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(24, 32, 24, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(24, 32, 24, 0.045) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, black, transparent 78%);
}

.shell {
  width: min(1120px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.hero {
  max-width: 820px;
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent-dark);
  font-family: "Aptos Mono", "Cascadia Mono", monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2.7rem, 7vw, 6.5rem);
  line-height: 0.92;
  letter-spacing: -0.07em;
}

.lede {
  max-width: 720px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 2vw, 1.35rem);
  line-height: 1.75;
}

.panel,
.message,
.result {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.panel {
  padding: 24px;
}

.form {
  display: grid;
  gap: 18px;
}

label {
  display: grid;
  gap: 8px;
}

label span {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 700;
}

input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px 16px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.72);
  font: inherit;
}

input:focus {
  outline: 3px solid rgba(216, 93, 39, 0.2);
  border-color: rgba(216, 93, 39, 0.54);
}

.amount-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

button {
  width: fit-content;
  border: 0;
  border-radius: 999px;
  padding: 14px 22px;
  color: #fffaf0;
  background: var(--ink);
  font-family: "Aptos Mono", "Cascadia Mono", monospace;
  font-weight: 800;
  cursor: pointer;
  transition: transform 160ms ease, background 160ms ease;
}

button:hover {
  transform: translateY(-1px);
  background: var(--accent-dark);
}

button:disabled {
  cursor: wait;
  opacity: 0.62;
}

.message {
  margin-top: 18px;
  padding: 16px 18px;
  color: var(--bad);
}

.result {
  margin-top: 22px;
  padding: 24px;
}

.summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 22px;
}

.metric {
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 16px;
  background: rgba(255, 255, 255, 0.52);
}

.metric small {
  display: block;
  color: var(--muted);
  font-family: "Aptos Mono", "Cascadia Mono", monospace;
  font-size: 0.74rem;
  text-transform: uppercase;
}

.metric strong {
  display: block;
  margin-top: 8px;
  font-size: 1.55rem;
}

.tables {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

table {
  width: 100%;
  border-collapse: collapse;
  overflow: hidden;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.48);
}

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

th:first-child,
td:first-child {
  text-align: left;
}

th {
  color: var(--muted);
  font-family: "Aptos Mono", "Cascadia Mono", monospace;
  font-size: 0.76rem;
  text-transform: uppercase;
}

tr:last-child td {
  border-bottom: 0;
}

.ok {
  color: var(--ok);
  font-weight: 800;
}

.bad {
  color: var(--bad);
  font-weight: 800;
}

.shifts {
  margin-top: 20px;
  color: var(--muted);
  font-family: "Aptos Mono", "Cascadia Mono", monospace;
  font-size: 0.88rem;
  line-height: 1.8;
}

@media (max-width: 760px) {
  .shell {
    width: min(100vw - 20px, 1120px);
    padding-top: 28px;
  }

  .amount-grid,
  .summary,
  .tables {
    grid-template-columns: 1fr;
  }

  .panel,
  .result {
    padding: 16px;
    border-radius: 22px;
  }
}