:root {
    --bg-color: #f4f7f9;
    --surface-color: #ffffff;
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --text-color: #333;
    --border-color: #dee2e6;
    --sidebar-width: 280px;
}

body {
    font-family: 'Sarabun', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    height: 100vh;
    overflow: hidden;
}

.main-container {
    display: flex;
    width: 100%;
    height: 100%;
}

/* Sidebar */
.controls-sidebar {
    width: var(--sidebar-width);
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
    overflow-y: auto;
    box-shadow: 2px 0 15px rgba(0,0,0,0.05);
    transition: opacity 0.3s;
}
.controls-sidebar h2 {
    text-align: center;
    margin: 0 0 1rem 0;
    font-weight: 700;
}
.control-group {
    padding: 0.5rem 0;
}
.control-group label {
    display: block;
    margin-bottom: 0.75rem;
    font-weight: 500;
}
hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 1rem 0;
}

/* Content Area */
.content-area {
    flex-grow: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    overflow: hidden;
    background-color: #e9ecef;
}
.cropper-container {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 3rem;
    width: 100%;
    max-width: 600px;
    background-color: var(--surface-color);
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
}
.upload-area.hidden {
    display: none;
}
.upload-area:hover, .upload-area.dragover {
    background-color: #f8f9fa;
    border-color: var(--primary-color);
}
.upload-area label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    color: #6c757d;
}
.upload-area svg {
    color: var(--primary-color);
}
#file-input {
    display: none;
}
#image-to-crop {
    display: none; /* Hidden by default */
    max-width: 100%;
    max-height: 100%;
}

/* Sidebar Buttons & Inputs */
.action-buttons {
    display: flex;
    gap: 0.5rem;
    justify-content: space-between;
}
.action-buttons button {
    background-color: #e9ecef;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    width: 48px;
    height: 48px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s, transform 0.2s;
}
.action-buttons button:hover {
    background-color: #ced4da;
    transform: scale(1.05);
}

.action-btn, .download-btn, .clear-btn {
    background-color: transparent;
    color: var(--text-color);
    font-family: 'Sarabun', sans-serif;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}
.action-btn:hover {
    background-color: #f1f3f5;
    border-color: #adb5bd;
}

.download-btn {
    background-color: var(--primary-color);
    color: white;
    font-weight: bold;
    border-color: var(--primary-color);
}
.download-btn:hover {
    background-color: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
    transform: translateY(-2px);
}
.clear-btn {
    background-color: #dc3545;
    color: white;
    border-color: #dc3545;
}
.clear-btn:hover {
    background-color: #c82333;
    border-color: #c82333;
}

/* Disabled State */
.disabled {
    opacity: 0.5;
    pointer-events: none;
    user-select: none;
}


/* Sidebar Radio Buttons */
.radio-group {
    display: flex;
    gap: 0.5rem;
}
.radio-group input[type="radio"] {
    display: none;
}
.radio-group label {
    flex-grow: 1;
    text-align: center;
    padding: 0.5rem;
    border-radius: 6px;
    background-color: #e9ecef;
    cursor: pointer;
    transition: background-color 0.2s;
    border: 1px solid var(--border-color);
    margin-bottom: 0;
}
.radio-group input[type="radio"]:checked + label {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    font-weight: bold;
}

/* Sidebar Quality Slider */
#quality-control {
    transition: opacity 0.3s ease-in-out;
}
#quality-slider {
    width: 100%;
    cursor: pointer;
}

.back-home-btn {
  display: inline-block;
  background: #1e88e5;
  color: #fff;
  padding: 10px 16px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: bold;
  transition: 0.2s;
}
.back-home-btn:hover {
  background: #1565c0;
}