:root {
  --green: #1fa855;
  --green-dark: #17843f;
  --ink: #1b1f23;
  --muted: #5b6470;
  --bg: #f7f9f8;
  --card: #ffffff;
  --border: #e3e8e5;
  --warn-bg: #fff7e6;
  --warn-border: #f0c36d;
  --danger: #c0392b;
  color-scheme: light;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

img { max-width: 100%; }

a { color: var(--green-dark); }

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.site-header .brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
.site-header nav a {
  margin-left: 16px;
  text-decoration: none;
  color: var(--muted);
  font-size: 0.95rem;
}
.site-header nav a:hover { color: var(--ink); }

main { max-width: 860px; margin: 0 auto; padding: 28px 20px 60px; }
.legal { max-width: 720px; }
.legal h2 { margin-top: 1.8em; }

.site-footer {
  text-align: center;
  padding: 24px 20px 40px;
  color: var(--muted);
  font-size: 0.85rem;
}
.site-footer a { color: var(--muted); margin: 0 6px; }

.hero {
  text-align: center;
  padding: 40px 0 20px;
}
.hero h1 {
  font-size: 2rem;
  margin-bottom: 0.4em;
}
.hero p.lead {
  font-size: 1.1rem;
  color: var(--muted);
  max-width: 600px;
  margin: 0 auto 1.4em;
}

.btn {
  display: inline-block;
  background: var(--green);
  color: #fff;
  border: none;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover { background: var(--green-dark); }
.btn:disabled { opacity: 0.6; cursor: not-allowed; }
.btn.secondary {
  background: transparent;
  color: var(--green-dark);
  border: 1.5px solid var(--green);
}
.btn.secondary:hover { background: #eefaf1; }

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin: 28px 0;
}
.tool-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  text-decoration: none;
  color: var(--ink);
  display: block;
}
.tool-card:hover { border-color: var(--green); }
.tool-card .emoji { font-size: 1.8rem; }
.tool-card h3 { margin: 0.4em 0 0.3em; }
.tool-card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.pricing-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  text-align: center;
  max-width: 420px;
  margin: 30px auto;
}
.pricing-box .price { font-size: 2.2rem; font-weight: 700; margin: 0.2em 0; }
.pricing-box .price small { font-size: 1rem; font-weight: 400; color: var(--muted); }
.pricing-box ul { text-align: left; margin: 1em 0; padding-left: 1.2em; }

.data-disclosure {
  background: #eef4ff;
  border: 1px solid #cfe0ff;
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 0.85rem;
  color: #2a3d66;
  margin: 14px 0;
}
.data-disclosure strong { color: #1b2c52; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px;
  margin: 20px 0;
}

label { display: block; font-weight: 600; margin: 14px 0 6px; font-size: 0.92rem; }
input[type=text], input[type=number], select, textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  background: #fff;
  color: var(--ink);
}
textarea { resize: vertical; min-height: 100px; }
.hint { font-size: 0.82rem; color: var(--muted); margin-top: 4px; }

.tone-options { display: flex; gap: 10px; flex-wrap: wrap; }
.tone-options label {
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 8px 12px;
  cursor: pointer;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 6px;
}
.tone-options input { margin: 0; }

.loading {
  display: none;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  margin: 14px 0;
}
.loading.active { display: flex; }
.spinner {
  width: 18px; height: 18px;
  border: 3px solid var(--border);
  border-top-color: var(--green);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.result-box {
  display: none;
  background: #f2fbf5;
  border: 1px solid #bfe8cc;
  border-radius: 10px;
  padding: 16px;
  margin-top: 16px;
  white-space: pre-wrap;
  font-size: 0.95rem;
}
.result-box.active { display: block; }

.error-box {
  display: none;
  background: #fdecea;
  border: 1px solid #f3b6ae;
  color: var(--danger);
  border-radius: 10px;
  padding: 12px 14px;
  margin-top: 14px;
  font-size: 0.9rem;
}
.error-box.active { display: block; }

.paywall-box {
  display: none;
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  border-radius: 12px;
  padding: 18px;
  margin-top: 16px;
  text-align: center;
}
.paywall-box.active { display: block; }

.copy-btn {
  margin-top: 10px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 0.85rem;
  cursor: pointer;
}
.copy-btn:hover { background: #f0f0f0; }

.starter-item {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  margin-bottom: 12px;
}
.starter-item .example-q {
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 6px;
}
.starter-result {
  background: #f2fbf5;
  border: 1px solid #bfe8cc;
  border-radius: 8px;
  padding: 10px 12px;
  margin-top: 8px;
  font-size: 0.9rem;
  white-space: pre-wrap;
}

.banner {
  border-radius: 10px;
  padding: 12px 16px;
  margin-bottom: 16px;
  font-size: 0.92rem;
}
.banner.success { background: #eaf9ee; border: 1px solid #bfe8cc; color: #1a6b34; }
.banner.error { background: #fdecea; border: 1px solid #f3b6ae; color: var(--danger); }
.banner.info { background: #eef4ff; border: 1px solid #cfe0ff; color: #2a3d66; }

@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  main { padding: 20px 16px 50px; }
}