:root {
  --bg: #eef3f7;
  --bg-accent: #d9e6f0;
  --surface: #ffffff;
  --ink: #152533;
  --muted: #5b6b7a;
  --brand: #1b4f72;
  --brand-press: #143c57;
  --line: #c9d6e2;
  --ok: #1f6b4a;
  --err: #8b2e2e;
  --shadow: 0 10px 30px rgba(21, 37, 51, 0.08);
  --radius: 14px;
  --touch: 48px;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 500px at 10% -10%, #cfe0ec 0%, transparent 55%),
    radial-gradient(900px 400px at 100% 0%, #dde8f1 0%, transparent 50%),
    var(--bg);
  color: var(--ink);
}

body {
  padding: 24px 16px 48px;
}

.app {
  width: min(720px, 100%);
  margin: 0 auto;
}

.header h1 {
  margin: 0 0 8px;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0 0 24px;
  color: var(--muted);
  line-height: 1.45;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 20px;
}

.file-button,
#copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--touch);
  padding: 0 18px;
  border: 0;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
}

.file-button {
  background: var(--brand);
  color: #fff;
}

.file-button:hover,
.file-button:focus-visible {
  background: var(--brand-press);
}

.file-button input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
  overflow: hidden;
}

#copy-btn {
  background: var(--surface);
  color: var(--brand);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

#copy-btn:hover:not(:disabled),
#copy-btn:focus-visible:not(:disabled) {
  border-color: var(--brand);
}

#copy-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.table-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.results {
  width: 100%;
  border-collapse: collapse;
}

.results th,
.results td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.results th {
  background: var(--bg-accent);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.results .num {
  text-align: right;
  width: 30%;
  font-variant-numeric: tabular-nums;
}

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

.results .empty td {
  color: var(--muted);
  text-align: center;
  padding: 28px 16px;
}

.results .spacer td {
  padding: 8px 16px;
  border-bottom: 0;
}

.results .total td {
  font-weight: 700;
  background: #f7fafc;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%);
  max-width: min(90vw, 420px);
  padding: 12px 16px;
  border-radius: 12px;
  background: var(--ink);
  color: #fff;
  box-shadow: var(--shadow);
  z-index: 10;
}

.toast.ok {
  background: var(--ok);
}

.toast.err {
  background: var(--err);
}

@media (max-width: 520px) {
  .actions {
    flex-direction: column;
  }

  .file-button,
  #copy-btn {
    width: 100%;
  }
}