/* ===== Reset & Base ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f7f7f7;
  color: #222;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ===== Container ===== */
.container {
  background: #fff;
  border: 1px solid #e0e0e0;
  border-radius: 8px;
  padding: 2.5rem 2rem;
  width: 100%;
  max-width: 440px;
}

h1 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-size: 0.875rem;
  color: #666;
  margin-bottom: 2rem;
}

/* ===== Form ===== */
.form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

label {
  font-size: 0.85rem;
  font-weight: 500;
  color: #444;
}

input[type="number"],
input[type="text"],
select {
  border: 1px solid #d0d0d0;
  border-radius: 5px;
  padding: 0.5rem 0.75rem;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.15s;
  width: 100%;
  background: #fff;
}

input:focus,
select:focus {
  border-color: #555;
}

/* ===== Filename row ===== */
.filename-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.filename-row input {
  flex: 1;
}

.ext {
  font-size: 0.9rem;
  color: #888;
  white-space: nowrap;
}

/* ===== Button ===== */
button {
  background: #111;
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover {
  background: #333;
}

button:disabled {
  background: #aaa;
  cursor: not-allowed;
}

/* ===== Status ===== */
.status {
  font-size: 0.85rem;
  min-height: 1.2rem;
  color: #444;
  text-align: center;
}

.status.error {
  color: #c00;
}

.status.success {
  color: #080;
}