body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f7f6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Navbar (Top Navigation) --- */
.navbar {
    background-color: #4D148C; /* FedEx Purple */
    color: white;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.navbar .brand {
    font-size: 1.8em;
    font-weight: bold;
    color: white;
    text-decoration: none;
    letter-spacing: 0.5px;
}

.navbar .nav-links a {
    color: white;
    text-decoration: none;
    margin-left: 25px;
    font-size: 1.1em;
    transition: color 0.3s ease;
}

.navbar .nav-links a:hover {
    color: #FF6200; /* FedEx Orange */
}

/* --- Main Container for Content --- */
.container {
    background-color: #ffffff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 960px; /* Wider for dashboard content */
    box-sizing: border-box;
    margin: 30px auto; /* Centers the container and adds vertical space */
    text-align: center;
    flex-grow: 1; /* Allows container to take up available vertical space */
}

h1 {
    color: #333;
    margin-bottom: 25px;
    font-size: 2.2em;
}

h2 {
    color: #4D148C; /* FedEx Purple */
    margin-bottom: 20px;
    font-size: 1.6em;
}

/* --- Shared Card Styles for Sections --- */
.auth-section, .dashboard-grid, .scan-new-card, .tracking-list-card {
    margin-bottom: 30px;
    padding: 20px;
    border: 1px dashed #ccc;
    border-radius: 8px;
    background-color: #fcfcfc;
}

/* --- Auth Section (Login/Register) Specific Styles --- */
.auth-section form {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.auth-section label {
    align-self: flex-start; /* Aligns label to the left */
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}
.auth-section input[type="text"],
.auth-section input[type="password"] {
    width: 100%;
    max-width: 350px; /* Limits input width */
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
    box-sizing: border-box; /* Includes padding/border in width */
}
.auth-section button {
    background-color: #007bff; /* Standard blue for actions */
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.05em;
    transition: background-color 0.3s ease;
    margin: 5px;
    min-width: 120px; /* Ensures buttons are readable */
}
.auth-section button:hover {
    background-color: #0056b3;
}

/* --- Dashboard Grid Layout --- */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr; /* Single column by default (mobile first) */
    gap: 30px; /* Space between grid items */
}
@media (min-width: 768px) {
    .dashboard-grid {
        grid-template-columns: 1fr 1fr; /* Two columns on larger screens */
        text-align: left; /* Align card content to left within the grid */
    }
    .scan-new-card {
        order: 2; /* Puts scan card on the right column */
    }
    .tracking-list-card {
        order: 1; /* Puts list on the left column */
    }
}

/* --- Tracking List Styles --- */
.tracking-list {
    list-style: none; /* Remove bullet points */
    padding: 0;
    max-height: 400px; /* Limits height and adds scrollbar if content overflows */
    overflow-y: auto;
    border: 1px solid #eee;
    border-radius: 5px;
    background-color: #fff;
}
.tracking-list li {
    display: flex;
    justify-content: space-between; /* Spaces items out */
    align-items: center;
    padding: 12px 15px;
    border-bottom: 1px solid #eee;
}
.tracking-list li:last-child {
    border-bottom: none; /* No border on the last item */
}
.tracking-info {
    flex-grow: 1; /* Allows info to take up available space */
}
.tracking-info strong {
    font-size: 1.1em;
    color: #333;
}
.tracking-info small {
    display: block; /* Makes date appear on new line */
    color: #777;
    font-size: 0.85em;
}
.tracking-actions button {
    padding: 8px 12px;
    font-size: 0.9em;
    margin-left: 10px; /* Space between buttons */
    background-color: #007bff; /* Default action button color */
}
.tracking-actions button.delete-tracking-btn {
    background-color: #dc3545; /* Red for delete button */
}
.tracking-actions button.delete-tracking-btn:hover {
    background-color: #c82333;
}

/* --- Scanner Section (re-used from previous version) --- */
.scanner-section {
    position: relative;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    border: 1px dashed #ccc;
    border-radius: 8px;
    background-color: #fcfcfc;
    padding: 15px;
    margin-bottom: 20px;
}

.viewport {
    width: 100%;
    max-width: 400px;
    height: 200px;
    border: 1px solid #ddd;
    background-color: #000;
    overflow: hidden;
    position: relative;
}

video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.drawingBuffer { /* QuaggaJS uses this for drawing detection lines */
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* --- Manual Input Section (re-used) --- */
.manual-input-section {
    padding: 15px;
}
.manual-input-section label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}
.manual-input-section input[type="text"] {
    width: calc(100% - 20px); /* Full width minus padding */
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1em;
    box-sizing: border-box;
}
.manual-input-section button {
    background-color: #FF6200; /* FedEx Orange for the save button */
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1.05em;
    transition: background-color 0.3s ease;
}
.manual-input-section button:hover {
    background-color: #e65200;
}

/* --- Flask Flash Messages --- */
.flashes {
    list-style: none;
    padding: 0;
    margin-bottom: 20px;
    text-align: center;
}
.flashes li {
    padding: 10px 20px;
    margin-bottom: 10px;
    border-radius: 5px;
    font-weight: bold;
}
.flashes .success {
    background-color: #d4edda; /* Light green */
    color: #155724; /* Dark green text */
    border: 1px solid #c3e6cb;
}
.flashes .danger {
    background-color: #f8d7da; /* Light red */
    color: #721c24; /* Dark red text */
    border: 1px solid #f5c6cb;
}
.flashes .warning {
    background-color: #fff3cd; /* Light yellow */
    color: #856404; /* Dark yellow text */
    border: 1px solid #ffeeba;
}
.flashes .info {
    background-color: #d1ecf1; /* Light blue */
    color: #0c5460; /* Dark blue text */
    border: 1px solid #bee5eb;
}

/* --- Loading and Error Messages --- */
#loading {
    margin-top: 20px;
    font-size: 1.1em;
    color: #007bff;
}

.error-message {
    color: #dc3545;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    padding: 10px;
    border-radius: 5px;
    margin-top: 20px;
}

/* --- Receipt Display Section --- */
.receipt-section {
    border-top: 2px solid #eee;
    padding-top: 20px;
    margin-top: 30px;
    text-align: left; /* Aligns receipt details to the left */
}

.receipt-content {
    background-color: #fcfcfc;
    border: 1px solid #e0e0e0;
    padding: 20px;
    border-radius: 5px;
    margin-bottom: 20px;
    overflow-x: auto; /* For small screens if content is too wide */
}

.receipt-actions {
    margin-top: 20px;
    display: flex;
    flex-wrap: wrap; /* Allows buttons to wrap on smaller screens */
    justify-content: center;
    gap: 10px; /* Space between action buttons */
}

.receipt-actions button {
    flex-grow: 1; /* Allows buttons to grow and fill space */
    max-width: 200px; /* Limits individual button width */
    margin: 0; /* Override default button margin */
}
.receipt-actions input[type="email"] {
    flex-grow: 2; /* Allows email input to be wider */
    max-width: 300px;
    margin: 0;
}

/* --- Utility Class for Hiding Elements --- */
.hidden {
    display: none;
}

/* --- Media Queries for Responsiveness --- */
@media (max-width: 767px) {
    .navbar {
        flex-direction: column; /* Stack navbar items vertically */
        align-items: flex-start;
        padding: 15px 20px;
    }
    .navbar .nav-links {
        margin-top: 10px;
        width: 100%;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
    }
    .navbar .nav-links a {
        margin: 5px 0;
    }

    .container {
        padding: 20px;
        margin: 20px auto;
    }

    h1 {
        font-size: 1.8em;
    }
    h2 {
        font-size: 1.4em;
    }

    /* Full width for inputs and buttons on small screens */
    .auth-section input[type="text"],
    .auth-section input[type="password"],
    .auth-section button,
    .manual-input-section input[type="text"],
    .manual-input-section button {
        width: 100%;
        margin-left: 0;
        margin-right: 0;
    }

    /* Adjust tracking list items for small screens */
    .tracking-list li {
        flex-direction: column; /* Stack tracking info and actions vertically */
        align-items: flex-start;
    }
    .tracking-actions {
        margin-top: 10px;
        width: 100%;
        display: flex;
        justify-content: space-around;
    }
    .tracking-actions button {
        margin-left: 0;
        margin-right: 5px;
        flex: 1; /* Allow buttons to share space */
        min-width: unset; /* Remove min-width to allow shrinking */
    }

    /* Adjust receipt actions for small screens */
    .receipt-actions {
        flex-direction: column;
        align-items: center;
    }
    .receipt-actions button,
    .receipt-actions input[type="email"] {
        max-width: 100%;
        width: 100%;
    }
}