/* ===== EncryptSecureDEC WebApp 共通スタイル ===== */
body {
  font-family: "Segoe UI", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;
  background: #0d1117;
  color: #e6edf3;
  margin: 0;
  padding: 0;
}

header {
  background: #161b22;
  padding: 1rem 2rem;
  border-bottom: 1px solid #30363d;
}

header h2 {
  margin: 0;
  color: #58a6ff;
}

main {
  max-width: 900px;
  margin: 2rem auto;
  padding: 2rem;
  background: #161b22;
  border-radius: 10px;
  box-shadow: 0 0 15px rgba(0,0,0,0.4);
}

h3 {
  border-left: 5px solid #58a6ff;
  padding-left: 0.5rem;
  color: #c9d1d9;
}

form {
  margin: 1rem 0 2rem 0;
  background: #0d1117;
  border: 1px solid #30363d;
  border-radius: 8px;
  padding: 1.5rem;
}

input[type="text"],
input[type="file"],
input[type="password"] {
  display: block;
  width: 100%;
  margin: 0.5rem 0;
  padding: 0.6rem;
  border: 1px solid #30363d;
  border-radius: 5px;
  background: #0d1117;
  color: #c9d1d9;
}

button {
  background: #238636;
  color: white;
  border: none;
  padding: 0.7rem 1.5rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

button:hover {
  background: #2ea043;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin-top: 1rem;
  background: #0d1117;
}

th, td {
  padding: 0.6rem;
  border: 1px solid #30363d;
  text-align: left;
}

th {
  background: #21262d;
  color: #58a6ff;
}

tr:nth-child(even) {
  background: #161b22;
}

a, .logout {
  display: inline-block;
  margin-top: 1rem;
  text-decoration: none;
  background: #da3633;
  color: white;
  padding: 0.6rem 1.2rem;
  border-radius: 5px;
  transition: background 0.3s;
}

.logout:hover, a:hover {
  background: #f85149;
}

footer {
  text-align: center;
  margin-top: 2rem;
  font-size: 0.9rem;
  color: #8b949e;
}