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

body {
    font-family: "Segoe UI", Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f6f8;
    color: #333; /* neutral for most text */
    padding: 20px;
}

/* Main container */
main {
    max-width: 800px;
    margin: 0 auto;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.2em;
    color: #007BFF; /* headings in blue */
    margin-bottom: 0.2em;
}

header p {
    font-size: 1.1em;
    color: #555; /* helper text gray */
}

/* Sections */
section {
    background: #fff;
    padding: 20px 25px;
    margin-bottom: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

section:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}

/* Labels and Inputs */
label {
    display: block;
    margin-bottom: 12px;
    font-weight: 500;
}

input[type="text"],
input[type="number"] {
    padding: 8px 10px;
    margin-top: 5px;
    width: 100%;
    max-width: 300px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 0.95em;
}

/* Action checkboxes */
label[for="removeGPS"],
label[for="removeSerial"] {
    color: #FF6F00; /* orange for actions */
    font-weight: bold;
    font-size: 1.05em; /* slightly bigger */
    cursor: pointer;
    display: inline-block;
    margin-right: 15px;
    margin-top: 8px;
}

/* Upload / File select label */
.file-label {
    display: inline-block;
    padding: 12px 18px;
    background-color: #e0e6ed;
    border-radius: 8px;
    cursor: pointer;
    margin-bottom: 5px;
    font-weight: 500;
    transition: background-color 0.2s ease;
}

.file-label:hover {
    background-color: #d1d9e6;
}

.helper-text {
    font-size: 0.9em;
    color: #555; /* muted gray for instructions */
    margin-top: 5px;
}

/* Download / Unlock / Clear Buttons */
#downloadBtn, .unlock-btn, #clearBtn {
    border: none;
    padding: 14px 28px;
    font-size: 1em;
    font-weight: bold;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.1s ease, box-shadow 0.2s ease;
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
    display: inline-block;
}

#downloadBtn {
    background-color: #FF6F00; /* primary action */
    color: #fff;
}

#downloadBtn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    box-shadow: none;
}

#downloadBtn:hover:not(:disabled) {
    transform: translateY(-2px);
}

.unlock-btn {
    background-color: #FF6F00;
    color: #fff;
}

.unlock-btn:hover {
    background-color: #e65c00;
    transform: translateY(-2px);
}

#clearBtn {
    background-color: #6c757d;
    color: #fff;
}

#clearBtn:hover {
    transform: translateY(-2px);
}

/* File List */
ul {
    list-style: none;
    margin-top: 10px;
    padding-left: 0;
}

ul li {
    padding: 8px 12px;
    border-bottom: 1px solid #eee;
    border-radius: 6px;
    transition: background-color 0.15s ease;
    color: #333; /* neutral text */
}

ul li:hover {
    background-color: #f0f8ff;
}

/* Metadata */
#metadata p {
    margin-top: 5px;
    color: #333; /* neutral for most fields */
}

#metadata h3, #metadata h4 {
    color: #007BFF; /* headings in blue */
    margin-top: 12px;
}

/* Fade-in animation for file list and metadata */
@keyframes fadeIn {
    from {opacity: 0;}
    to {opacity: 1;}
}

#fileList, #metadata {
    animation: fadeIn 0.3s ease;
}

/* FAQ styling */
dl dt {
    font-weight: 600;
    margin-top: 12px;
    color: #007BFF; /* headings blue */
}

dl dd {
    margin-left: 20px;
    margin-bottom: 8px;
    color: #333; /* neutral body text */
}

/* Footer */
footer {
    text-align: center;
    font-size: 0.9em;
    color: #777;
    margin-top: 30px;
}