:root {
  --bg: #f6f8fb;
  --panel: #ffffff;
  --text: #1f2937;
  --muted: #5f6b7a;
  --line: #d9e0ea;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --danger: #b91c1c;
  --success: #1f2937;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.header-inner,
.container,
.site-footer {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 0;
  flex-wrap: wrap;
}

.brand {
  color: var(--text);
  font-size: 1.2rem;
  font-weight: 700;
}

.nav,
.language-switcher {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.nav a {
  color: var(--text);
  font-size: 0.95rem;
}

.language-switcher {
  color: var(--muted);
  font-size: 0.92rem;
}

.hero {
  padding: 48px 0 20px;
}

.hero h1,
.page-title {
  margin: 0 0 12px;
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.15;
}

.hero p,
.lead {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 760px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin: 28px 0 52px;
}

.card,
.tool-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 22px;
  box-shadow: 0 10px 24px rgba(31, 41, 55, 0.06);
}

.tool-card h2 {
  margin: 0 0 8px;
  font-size: 1.25rem;
}

.tool-card p {
  margin: 0 0 18px;
  color: var(--muted);
}

.page-section {
  padding: 34px 0 56px;
}

.tool-panel {
  max-width: 760px;
  margin-top: 24px;
}

.field {
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 650;
}

input[type="file"],
input[type="text"],
input[type="number"],
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 11px 12px;
  background: #fff;
  color: var(--text);
  font: inherit;
}

.hint {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 6px;
}

.button,
button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  padding: 10px 18px;
  background: var(--primary);
  color: #fff;
  cursor: pointer;
  font: inherit;
  font-weight: 700;
}

.button:hover,
button:hover {
  background: var(--primary-dark);
  text-decoration: none;
}

.secondary-button {
  min-height: 34px;
  padding: 6px 10px;
  background: #eef2ff;
  color: var(--primary-dark);
}

.secondary-button:hover {
  background: #dfe7ff;
}

.file-list {
  padding: 0;
  margin: 14px 0 0;
  list-style: none;
}

.file-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px 12px;
  margin-bottom: 8px;
  background: #fbfcff;
}

.message {
  margin-top: 16px;
  min-height: 28px;
  font-weight: 650;
}

.message.error {
  color: var(--danger);
}

.message.success {
  color: var(--success);
}

.content-card {
  max-width: 820px;
}

.content-card ul {
  padding-left: 22px;
}

.site-footer {
  padding: 28px 0;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-size: 0.92rem;
}

@media (max-width: 760px) {
  .header-inner {
    align-items: flex-start;
  }

  .nav,
  .language-switcher {
    width: 100%;
  }

  .tool-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 34px;
  }

  .card,
  .tool-card {
    padding: 18px;
  }

  .file-list li {
    align-items: flex-start;
    flex-direction: column;
  }
}