* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Segoe UI", Arial, sans-serif;
  background: #f0f2f5;
  color: #333;
  padding: 40px 16px;
}

.container {
  max-width: 600px;
  margin: 0 auto;
}

h1 {
  text-align: center;
  margin-bottom: 24px;
  font-size: 1.5rem;
  color: #1a1a2e;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 28px;
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  margin-bottom: 20px;
}

.form-group {
  margin-bottom: 18px;
}

label {
  display: block;
  margin-bottom: 6px;
  font-weight: 600;
  font-size: 0.9rem;
}

.required {
  color: #e74c3c;
}

.optional {
  font-weight: 400;
  color: #888;
  font-size: 0.82rem;
}

input[type="file"],
input[type="text"],
input[type="date"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 0.95rem;
  transition: border-color 0.2s;
}

input[type="file"]:focus,
input[type="text"]:focus,
input[type="date"]:focus {
  outline: none;
  border-color: #4caf50;
}

.btn {
  display: inline-block;
  padding: 11px 24px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.btn:hover {
  opacity: 0.88;
}

.btn-preview {
  background: #4caf50;
  color: #fff;
  width: 100%;
  margin-top: 4px;
}

.btn-send {
  background: #25d366;
  color: #fff;
  width: 100%;
  margin-top: 16px;
}

.error {
  background: #fff3f3;
  border-left: 4px solid #e74c3c;
  color: #c0392b;
}

.preview-card h2 {
  font-size: 1.1rem;
  margin-bottom: 12px;
  color: #1a1a2e;
}

pre {
  background: #f7f8fa;
  border-radius: 8px;
  padding: 16px;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.6;
  border: 1px solid #e0e0e0;
}

/* ----- Topbar ----- */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.topbar h1 {
  margin-bottom: 0;
  font-size: 1.3rem;
}

.logout-btn {
  font-size: 0.85rem;
  color: #888;
  text-decoration: none;
  border: 1px solid #ccc;
  padding: 5px 12px;
  border-radius: 6px;
  transition: background 0.2s, color 0.2s;
  white-space: nowrap;
}

.logout-btn:hover {
  background: #f0f0f0;
  color: #333;
}

/* ----- Login card ----- */
.login-card {
  max-width: 380px;
  margin: 80px auto 0;
  text-align: center;
}

.login-logo {
  font-size: 2.8rem;
  margin-bottom: 8px;
}

.login-title {
  font-size: 1.4rem;
  margin-bottom: 4px;
}

.login-subtitle {
  color: #888;
  font-size: 0.9rem;
  margin-bottom: 24px;
}

.login-error {
  background: #fff3f3;
  border: 1px solid #f5c6cb;
  color: #c0392b;
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.9rem;
  margin-bottom: 12px;
  text-align: left;
}