@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  color-scheme: dark;
  --bg: #090c12;
  --panel: #0e131c;
  --line: #273142;
  --line-bright: #3b4960;
  --text: #f2f5f8;
  --muted: #8e9aad;
  --accent: #74e1c1;
  --accent-strong: #9ff3db;
  --accent-dark: #092d29;
  font-family: "DM Sans", system-ui, sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  color: var(--text);
  background: radial-gradient(circle at 75% -20%, rgba(53, 124, 110, 0.18), transparent 38rem), var(--bg);
}

button, textarea { font: inherit; }
button:focus-visible, textarea:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
h1, p { margin: 0; }

.page {
  width: min(34rem, 100%);
  margin: 0 auto;
  padding: clamp(2.5rem, 8vw, 5rem) 1.25rem 4rem;
}

.title {
  font: 600 clamp(2rem, 6vw, 2.75rem)/1.1 "Space Grotesk", sans-serif;
  letter-spacing: -0.03em;
}

.subtitle {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: clamp(0.95rem, 2.2vw, 1.05rem);
  line-height: 1.6;
}

.encode-form {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: 2.25rem;
}

.field-label {
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.text-field {
  width: 100%;
  padding: 0.9rem 1rem;
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: var(--panel);
  resize: vertical;
  line-height: 1.5;
  transition: border-color 160ms ease;
}
.text-field::placeholder { color: #5e6b7d; }
.text-field:focus { outline: none; border-color: var(--accent); }

.encode-button {
  align-self: flex-end;
  padding: 0.75rem 1.5rem;
  color: var(--accent-dark);
  border: 0;
  border-radius: 0.65rem;
  background: var(--accent);
  font-weight: 700;
  cursor: pointer;
  transition: background 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}
.encode-button:hover { background: var(--accent-strong); transform: translateY(-1px); box-shadow: 0 8px 26px rgba(116, 225, 193, 0.18); }
.encode-button:active { transform: translateY(0); }

.error-message {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  color: #ffb4a8;
  border: 1px solid rgba(255, 122, 105, 0.35);
  border-radius: 0.6rem;
  background: rgba(255, 122, 105, 0.08);
  font-size: 0.9rem;
}
.error-message[hidden] { display: none; }

.qr-result {
  display: flex;
  justify-content: center;
  margin-top: 3rem;
}
.qr-result[hidden] { display: none; }

.qr-frame {
  width: fit-content;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 1rem;
}

.qr-canvas {
  display: block;
  width: min(320px, 78vw);
  height: min(320px, 78vw);
  border-radius: 0.85rem;
  background: #ffffff;
  box-shadow: 0 1.5rem 3.5rem rgba(0, 0, 0, 0.45);
}

.download-button {
  padding: 0.65rem 1.35rem;
  color: var(--text);
  border: 1px solid var(--line-bright);
  border-radius: 0.6rem;
  background: transparent;
  font-weight: 600;
  cursor: pointer;
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease;
}
.download-button:hover { color: var(--accent-strong); border-color: var(--accent); background: rgba(116, 225, 193, 0.06); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}