:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #0c1b32;
  --muted: #66758a;
  --blue: #1767c2;
  --blue-dark: #104b91;
  --green: #0f9f6e;
  --red: #c81e1e;
  --border: #d8e0ec;
  --soft: #eef5ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 32px;
  line-height: 1.1;
}

h2 {
  font-size: 22px;
}

.topbar {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 18px 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar p,
.muted,
.note {
  color: var(--muted);
}

.layout {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 18px 44px;
  display: grid;
  gap: 16px;
}

.panel,
.login-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 10px 28px rgba(15, 23, 42, 0.05);
}

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

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 15px;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 13px;
  color: var(--text);
  font-size: 17px;
  font-family: inherit;
  background: #fff;
}

textarea {
  resize: vertical;
  min-height: 72px;
}

.file-field input {
  min-height: 48px;
}

.section-title,
.result-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.replacements {
  display: grid;
  gap: 12px;
}

.replacement-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) auto;
  align-items: end;
  gap: 12px;
  padding: 14px;
  background: var(--soft);
  border: 1px solid #d5e7ff;
  border-radius: 8px;
}

.primary,
.ghost {
  border: 1px solid var(--blue);
  background: var(--blue);
  color: #fff;
  padding: 13px 16px;
  border-radius: 8px;
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

.primary:hover {
  background: var(--blue-dark);
}

.ghost {
  background: #fff;
  color: var(--blue);
}

.ghost.small {
  padding: 9px 12px;
  font-size: 15px;
}

.ghost.danger {
  border-color: #fecaca;
  color: var(--red);
}

.download {
  min-width: 220px;
}

.error {
  color: var(--red);
  font-weight: 700;
  background: #fff7f7;
  border: 1px solid #fecaca;
  border-radius: 8px;
  padding: 12px;
}

table {
  width: 100%;
  margin-top: 18px;
  border-collapse: collapse;
}

th,
td {
  padding: 12px 10px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
}

th {
  color: var(--muted);
  font-weight: 700;
}

.note {
  padding: 4px 2px;
  line-height: 1.55;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 20px;
}

.login-shell {
  width: min(430px, 100%);
}

.login-card h1 {
  margin-bottom: 8px;
}

.login-card p {
  margin-bottom: 18px;
  color: var(--muted);
}

.login-form {
  display: grid;
  gap: 12px;
}

.login-error {
  color: var(--red);
  font-weight: 700;
}

@media (max-width: 820px) {
  .topbar,
  .section-title,
  .result-panel {
    align-items: flex-start;
    flex-direction: column;
  }

  .replacement-row {
    grid-template-columns: 1fr;
  }

  .primary,
  .ghost,
  .download {
    width: 100%;
  }

  h1 {
    font-size: 28px;
  }
}