/* --- Login Styles --- */
#login-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(244, 247, 249, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  backdrop-filter: blur(5px);
  -webkit-backdrop-filter: blur(5px);
  opacity: 1;
  transition: opacity 0.3s ease-in-out;
}

#login-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

.login-box {
  background: white;
  padding: 2rem 2.5rem;
  border-radius: 12px;
  box-shadow: 0 10px 25px rgba(0,0,0,0.1);
  text-align: center;
  width: 90%;
  max-width: 400px;
  border: 1px solid #dfe6e9;
}

.login-box h2 {
  margin-bottom: 0.5rem;
  color: #333;
  font-size: 1.75rem;
}

.login-box p {
  margin-bottom: 1.5rem;
  color: #777;
}

#login-form input {
  width: 100%;
  padding: 0.9rem;
  border: 1px solid #dfe6e9;
  border-radius: 8px;
  font-size: 1rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

#login-form input:focus {
  outline: none;
  border-color: #3498db;
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

#login-button {
  width: 100%;
  padding: 0.9rem;
  border: none;
  background: linear-gradient(135deg, #3498db, #2980b9);
  color: white;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

#login-button:hover:not(:disabled) {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}
#login-button:disabled {
  opacity: 0.7;
  cursor: wait;
}

#login-message {
  margin-top: 1rem;
  font-weight: 600;
  min-height: 22px;
  color: #e74c3c;
}

#app-wrapper.hidden {
  display: none !important;
}

/* --- Original App Styles --- */
:root {
  --primary-color: #3498db;
  --secondary-color: #2980b9;
  --accent-color: #e74c3c;
  --light-gray: #f4f7f9;
  --dark-gray: #333;
  --medium-gray: #777;
  --border-color: #dfe6e9;
  --border-radius: 8px;
  --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--light-gray);
  color: var(--dark-gray);
  line-height: 1.6;
}

header {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

header h1 {
  font-size: 1.5rem;
}

main {
  padding: 1rem;
}

.app-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  max-width: 1800px;
  margin: 0 auto;
}

.controls-panel, .preview-panel {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  display: flex;
  flex-direction: column;
}

.controls-nav {
  display: flex;
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  background: white;
  z-index: 10;
  border-top-left-radius: var(--border-radius);
  border-top-right-radius: var(--border-radius);
}

.nav-link {
  flex: 1;
  padding: 0.85rem 0.5rem;
  text-decoration: none;
  text-align: center;
  color: var(--medium-gray);
  font-weight: 600;
  border-bottom: 3px solid transparent;
  transition: color 0.2s, border-color 0.2s, background-color 0.2s;
  font-size: 0.9rem;
}

.nav-link:hover {
  background-color: #f8f9fa;
  color: var(--primary-color);
}

.nav-link.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

.controls-content {
  padding: 1.5rem;
  overflow-y: auto;
  flex-grow: 1;
}

.preview-panel {
  padding: 1.5rem;
}

h2, h3 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}
h3 {
  margin-top: 1.5rem;
}
.controls-content section:first-child h3 {
  margin-top: 0;
}
h4 {
  color: var(--dark-gray);
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  font-size: 1rem;
}
.control-section h4:first-of-type {
  margin-top: 0;
}

.control-section {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  color: #555;
  font-size: 0.9rem;
}

input[type="range"],
textarea,
input[type="color"] {
  width: 100%;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  transition: border-color 0.2s, box-shadow 0.2s;
  font-size: 1rem;
}

input[type="color"] {
  padding: 0.25rem;
  min-height: 48px;
}

input[type="range"]:focus,
textarea:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
  outline: none;
}

textarea {
  resize: vertical;
  font-family: inherit;
}

.file-upload-label {
  display: inline-block;
  padding: 0.75rem 1.2rem;
  background-color: #f0f0f0;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  margin-bottom: 1rem;
  text-align: center;
  width: 100%;
}
.file-upload-label:hover {
  background-color: #e9e9e9;
}

.font-controls, .size-controls, .logo-controls, .text-controls, .download-controls, .style-controls {
  margin-bottom: 1rem;
}

.checkbox-control {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  background-color: #fdfdfd;
  padding: 0.75rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
}
.checkbox-control label {
  margin-bottom: 0;
  font-weight: normal;
  cursor: pointer;
}
.checkbox-control input[type="checkbox"] {
  width: 1.25em;
  height: 1.25em;
  margin-bottom: 0;
  cursor: pointer;
}

.text-editor-toolbar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  background-color: #f9f9f9;
  padding: 0.5rem;
  border-radius: var(--border-radius);
  border: 1px solid var(--border-color);
  flex-wrap: wrap;
}

.editor-btn {
  width: 38px;
  height: 38px;
  border: 1px solid transparent;
  background-color: white;
  color: var(--dark-gray);
  cursor: pointer;
  border-radius: 4px;
  transition: background-color 0.2s, border-color 0.2s;
  display:flex;
  align-items:center;
  justify-content:center;
}
.editor-btn:hover {
  background-color: #e9e9e9;
  border-color: #ccc;
}
.separator {
  border-left: 1px solid var(--border-color);
  margin: 0 0.5rem;
}

.action-buttons {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.action-button, .download-button {
  padding: 0.85rem 1rem;
  border: none;
  background-color: var(--secondary-color);
  color: white;
  cursor: pointer;
  border-radius: var(--border-radius);
  transition: background-color 0.3s, transform 0.2s;
  font-weight: 600;
  font-size: 1rem;
}
.action-button:hover, .download-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.download-button {
  background: linear-gradient(135deg, var(--accent-color), #c0392b);
}

.radio-group {
  display: flex;
  gap: 1rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.radio-group label {
  font-weight: normal;
}

.paper-preview-wrapper {
  flex-grow: 1;
  background-color: #e9e9e9;
  padding: 1rem;
  border-radius: var(--border-radius);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow: auto;
  min-height: 70vh;
}

.paper-preview {
  padding: 0.4in 1in;
  background: white;
  box-shadow: 0 0 20px rgba(0,0,0,0.15);
  overflow: hidden; 
  position: relative;
  display: flex;
  flex-direction: column;
  transform-origin: top center;
  transform: scale(0.4);
}

.preview-header {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 10px;
  border-bottom: 2px solid var(--dark-gray);
  padding-bottom: 0.5rem;
  flex-shrink: 0;
}

#preview-logo {
  height: auto;
  object-fit: contain;
}

.preview-header-text {
  font-weight: bold;
  line-height: 1.4;
  white-space: pre-wrap;
}

.preview-body-text {
  flex-grow: 1;
  padding: 1rem 0;
  min-height: 100px;
  white-space: pre-wrap;
}

.preview-footer-text {
  border-top: 1px solid #ccc;
  padding-top: 1rem;
  color: var(--medium-gray);
  flex-shrink: 0;
  white-space: pre-wrap;
  text-align: center;
}

#preview-seals-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.preview-seal {
  position: absolute;
  cursor: move;
  min-width: 50px;
  min-height: 50px;
  pointer-events: auto;
}

.preview-seal img {
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.resize-handle, .delete-handle {
  opacity: 1; /* Always visible on mobile for clarity */
  pointer-events: auto;
  position: absolute;
  width: 30px;
  height: 30px;
  border: 2px solid white;
  border-radius: 50%;
  box-shadow: 0 1px 4px rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
}

.preview-seal.is-rendering .resize-handle,
.preview-seal.is-rendering .delete-handle {
  display: none;
}

.resize-handle {
  background: var(--primary-color);
  right: -15px;
  bottom: -15px;
  cursor: se-resize;
}

.delete-handle {
  background: var(--accent-color);
  color: white;
  font-family: monospace;
  font-weight: bold;
  font-size: 20px;
  line-height: 1;
  right: -15px;
  top: -15px;
  cursor: pointer;
}

footer {
  text-align: center;
  margin-top: 1.5rem;
  padding: 1rem;
  background-color: #e1e5e8;
  color: var(--medium-gray);
}

/* Responsive adjustments */

@media (min-width: 576px) {
  .paper-preview {
    transform: scale(0.6);
  }
}

@media (min-width: 768px) {
  main {
    padding: 1.5rem;
  }
  .paper-preview-wrapper {
    padding: 2rem;
  }
  .paper-preview {
    transform: scale(0.8);
  }
  .action-buttons {
    grid-template-columns: 1fr 1fr;
  }
  .download-button {
    grid-column: 1 / -1;
  }
  .preview-header {
    flex-direction: row;
    text-align: left;
  }
}

@media (min-width: 992px) {
  .app-container {
    display: grid;
    grid-template-columns: minmax(350px, 450px) 1fr;
    gap: 1.5rem;
    align-items: start;
  }
  .controls-panel {
    height: calc(100vh - 120px);
  }
  .preview-panel {
    position: sticky;
    top: 1.5rem;
    height: calc(100vh - 120px);
  }
  .paper-preview {
    transform: scale(1);
  }
}

@media (min-width: 1200px) {
  .app-container {
    grid-template-columns: minmax(400px, 500px) 1fr;
  }
}