:root {
  color-scheme: light dark;
  --font-sans: "Avenir Next", "Avenir", "Futura", "Trebuchet MS", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", "Menlo", "Consolas", "Liberation Mono", monospace;
  --bg: #f5f6fb;
  --bg-accent: #e3f4ff;
  --panel: rgba(255, 255, 255, 0.86);
  --panel-strong: #ffffff;
  --text: #1c2230;
  --muted: #5b657a;
  --border: #d6dbe7;
  --accent: #1b7f6e;
  --accent-strong: #136257;
  --danger: #c0392b;
  --shadow: 0 16px 40px rgba(20, 33, 61, 0.18);
  --radius: 18px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b111a;
    --bg-accent: #102a33;
    --panel: rgba(16, 22, 32, 0.9);
    --panel-strong: #121826;
    --text: #ecf2ff;
    --muted: #a8b0c2;
    --border: #263146;
    --accent: #4cc9a6;
    --accent-strong: #2aa27f;
    --danger: #ff6b6b;
    --shadow: 0 18px 45px rgba(0, 0, 0, 0.45);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text);
  background: linear-gradient(135deg, var(--bg), var(--bg-accent));
  padding: 28px clamp(16px, 3vw, 32px) 48px;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(27, 127, 110, 0.12), transparent 55%),
    radial-gradient(circle at 20% 80%, rgba(90, 146, 250, 0.14), transparent 60%);
  pointer-events: none;
  z-index: -1;
}

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--accent-strong);
}

.page {
  max-width: 1150px;
  margin: 0 auto;
}

.top {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.logo {
  font-size: clamp(22px, 2.4vw, 30px);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.tagline {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.tools-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.tools-menu a {
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.2s ease;
}

.tools-menu a:hover,
.tools-menu a:focus {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: rgba(27, 127, 110, 0.1);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 32px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

.intro h1 {
  margin: 0 0 8px;
  font-size: clamp(24px, 3vw, 32px);
}

.intro p {
  margin: 0 0 16px;
  color: var(--muted);
}

.steps {
  margin: 0 0 24px;
  padding-left: 18px;
  color: var(--muted);
}

.io-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label {
  font-weight: 600;
  font-size: 14px;
}

textarea {
  width: 100%;
  min-height: 320px;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-strong);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.5;
  resize: vertical;
}

textarea:focus {
  outline: 2px solid rgba(27, 127, 110, 0.35);
  border-color: var(--accent);
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 18px;
}

button {
  border: none;
  border-radius: 999px;
  padding: 10px 18px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: #ffffff;
  cursor: pointer;
  box-shadow: 0 8px 20px rgba(19, 98, 87, 0.35);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(19, 98, 87, 0.4);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.5);
  color: var(--muted);
  font-size: 14px;
}

.tools-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 20px;
}

.tool-card {
  background: var(--panel-strong);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-height: 160px;
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.tool-card h3 {
  margin: 0;
  font-size: 18px;
}

.tool-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.tool-card span {
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 14px;
}

.footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
}

.status {
  margin-top: 12px;
  font-size: 14px;
  color: var(--muted);
}

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

.status.success {
  color: var(--accent-strong);
}

.status:empty {
  display: none;
}

@media (max-width: 720px) {
  .tools-menu {
    border-radius: 18px;
  }

  textarea {
    min-height: 260px;
  }
}