:root {
  --bg: #eef4ff;
  --surface: #ffffff;
  --text: #0f2039;
  --muted: #556a89;
  --line: #d7e5ff;
  --primary: #0f8bff;
  --primary-dark: #0d70d6;
}

:root[data-theme="dark"] {
  --bg: #0a1321;
  --surface: #0f2035;
  --text: #e7f0ff;
  --muted: #94a9c5;
  --line: #223a57;
  --primary: #429dff;
  --primary-dark: #2a83e5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: radial-gradient(circle at 8% 0%, #dcecff 0%, transparent 42%), var(--bg);
  color: var(--text);
  font-family: "Plus Jakarta Sans", sans-serif;
}

.app-shell {
  margin: 0 auto;
  max-width: 1160px;
  padding: 28px 18px 48px;
}

.app-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 16px;
}

.brand {
  color: var(--text);
  font-weight: 800;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.top-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.language-toggle {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  background: var(--surface);
}

.lang-button {
  border: 0;
  padding: 8px 12px;
  font: inherit;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
}

.lang-button.is-active {
  color: #fff;
  background: var(--primary);
}

.theme-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  padding: 9px 14px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  box-shadow: 0 12px 28px rgba(15, 36, 66, 0.08);
}

.hero {
  margin-bottom: 14px;
}

.hero-tag {
  margin: 0 0 8px;
  color: var(--primary-dark);
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(1.55rem, 3.8vw, 2.6rem);
}

.hero p {
  margin: 10px 0 0;
}

.grid {
  display: grid;
  gap: 14px;
  margin-top: 14px;
}

.two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

h2 {
  margin: 0 0 10px;
  font-size: 1.12rem;
}

.muted {
  margin: 0 0 12px;
  color: var(--muted);
}

textarea,
input[type="file"] {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: transparent;
  color: var(--text);
  padding: 10px;
  margin-bottom: 10px;
  font: inherit;
}

.btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  padding: 10px 16px;
  cursor: pointer;
}

.btn.primary {
  border-color: transparent;
  background: var(--primary);
  color: #fff;
}

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

.status {
  min-height: 24px;
  margin: 10px 0 0;
  color: var(--muted);
}

.stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.stat {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px;
}

.stat span {
  display: block;
  color: var(--muted);
  font-size: 0.86rem;
}

.stat strong {
  display: block;
  margin-top: 4px;
  font-size: 1.05rem;
}

.table-wrap {
  max-height: 360px;
  overflow: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

th,
td {
  border-bottom: 1px solid var(--line);
  padding: 8px 10px;
  text-align: left;
}

.answer {
  margin: 10px 0 0;
  min-height: 136px;
  max-height: 300px;
  overflow: auto;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 12px;
  white-space: pre-wrap;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.actions {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; }
  .actions {
    align-items: flex-start;
    flex-direction: column;
  }
  .app-topbar {
    align-items: flex-start;
    flex-direction: column;
  }
}