:root {
  color: #1e2a26;
  background: #f5f3ed;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

main {
  width: min(100%, 480px);
  background: #fffefa;
  border: 1px solid #d9ddd5;
  border-radius: 10px;
  padding: 2.5rem;
  box-shadow: 0 10px 30px #1e2a2610;
}

.eyebrow {
  margin: 0 0 .75rem;
  color: #68766f;
  font-size: .8rem;
  font-weight: 650;
  letter-spacing: .08em;
  text-transform: uppercase;
}

h1 { margin: 0; font-size: clamp(2rem, 7vw, 2.75rem); letter-spacing: -.04em; }
.intro { color: #52605a; margin: .8rem 0 2rem; line-height: 1.5; }

form { display: grid; gap: .75rem; }
label { font-weight: 650; }
input[type="file"] { padding: .65rem; border: 1px solid #bdc7bf; border-radius: 6px; background: white; }
button, .button {
  display: inline-block;
  width: fit-content;
  border: 0;
  border-radius: 6px;
  padding: .7rem 1rem;
  background: #315d4d;
  color: white;
  font: inherit;
  font-weight: 650;
  text-decoration: none;
  cursor: pointer;
}
button:hover, .button:hover { background: #244739; }
.message { margin: 0 0 1.5rem; padding: .75rem; border-radius: 6px; line-height: 1.4; }
.message.error { background: #f9e9e4; color: #742f20; }
.unlocked { padding: 1rem; border-left: 3px solid #315d4d; background: #edf4ee; }
.unlocked p { margin-top: 0; }