:root {
    --primary-blue: #1877F2; /* Facebook Blue */
    --dark-primary-blue: #1465D1; 
    --light-primary-blue-bg: #e7f3ff; 
    --magenta: #FF00FF; 
    --dark-magenta: #C700C7; 
    --light-magenta-bg: #ffeeff; 
    --text-color: #333333;
    --light-text-color: #ffffff;
    --border-color: #ced4da; 
    --error-color: #D8000C; 
    --note-accent-color: #f0ad4e; 
    --note-bg-color: #fff9f0;    
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    line-height: 1.6; margin: 0; padding: 0;
    background-color: var(--light-primary-blue-bg); color: var(--text-color);
    display: flex; flex-direction: column; min-height: 100vh;
}

.container {
    max-width: 800px; margin: 30px auto;
    background: var(--light-text-color); padding: 25px 35px 35px 35px; 
    border-radius: 12px; box-shadow: 0 6px 25px rgba(0, 0, 0, 0.12);
    border-top: 6px solid var(--primary-blue); flex-grow: 1; 
}

header {
    background-color: var(--primary-blue); color: var(--light-text-color);
    padding: 20px 0; margin: -25px -35px 30px -35px; 
    border-top-left-radius: 6px; border-top-right-radius: 6px;
    text-align: center;
}
header h1 { margin: 0; font-size: 2.2em; font-weight: 600; }
nav { margin-top: 15px; }
nav a {
    margin: 0 12px; text-decoration: none; color: var(--light-primary-blue-bg);
    font-weight: 500; padding: 8px 15px; border-radius: 6px;
    transition: background-color 0.2s ease-in-out, color 0.2s ease-in-out;
}
nav a:hover { background-color: var(--dark-primary-blue); color: var(--light-text-color); }
nav a.active { background-color: var(--magenta); color: var(--light-text-color); }

.intro-blurb { 
    background-color: #f8f9fa; padding: 18px 20px;
    border-radius: 8px; margin-bottom: 20px; 
    border: 1px solid #e0e0e0; color: var(--text-color);
    text-align: center; 
}
.intro-blurb p { margin: 0.5em 0; }


.main-disclaimer-bottom {
    background-color: var(--light-magenta-bg);
    border: 1px solid var(--dark-magenta);
    border-left: 5px solid var(--dark-magenta);
    padding: 15px; margin-top: 30px; 
    border-radius: 8px; font-size: 0.9em; text-align: justify;
}
.main-disclaimer-bottom p { margin: 0; line-height: 1.5; }
.main-disclaimer-bottom strong { color: var(--dark-magenta); }

.form-group { margin-bottom: 20px; }
.form-group > label { 
    display: block; margin-bottom: 10px;
    font-weight: 500; color: var(--primary-blue);
}

.unit-selector-group label:first-child { margin-bottom: 10px; }
.unit-radio-buttons {
    display: flex; gap: 10px; align-items: center;
    background-color: #f8f9fa; padding: 10px 15px;
    border-radius: 8px; border: 1px solid var(--border-color);
    justify-content: center; 
}
.unit-radio-buttons input[type="radio"] { display: none !important; } 
.unit-radio-buttons label { 
    padding: 8px 15px; border: 1px solid var(--border-color);
    border-radius: 6px; cursor: pointer;
    transition: background-color 0.2s, color 0.2s, border-color 0.2s;
    font-weight: normal; color: var(--text-color);
    background-color: #fff; margin-bottom: 0; 
}
.unit-radio-buttons input[type="radio"]:checked + label {
    background-color: var(--primary-blue);
    color: var(--light-text-color);
    border-color: var(--primary-blue);
    font-weight: 500;
}
.unit-radio-buttons label:hover { border-color: var(--primary-blue); }

/* Bag Type Selector - Adjusted Icon Size */
.bag-type-selector {
    display: flex; 
    flex-wrap: wrap; /* Allow wrapping if needed, though aiming for one line */
    justify-content: center; /* Center if they don't fill the line */
    gap: 10px; 
    margin-bottom: 25px;
    /* overflow-x: auto; /* Removed for now, let's see if they fit with reduced size */
}
.bag-type-selector .bag-type-option {
    border: 2px solid var(--border-color); 
    padding: 8px; 
    border-radius: 8px; 
    cursor: pointer; text-align: center;
    transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s;
    display: flex; flex-direction: column;
    align-items: center; 
    justify-content: flex-start; /* Align to top */
    background-color: #fdfdff; 
    min-height: 0; 
    flex: 0 1 auto; /* Allow shrinking, but don't grow beyond auto basis */
    width: 120px; /* Approx 133 * 0.9, aiming for 5 across */
    box-sizing: border-box;
}
.bag-type-selector .bag-type-option img {
    display: block;
    width:  100%; /* Image will fill the 120px width of the option box */
    height: auto; /* Maintain aspect ratio */
    max-height: 162px; /* 120px * (300/222), based on 222:300 original aspect */
    margin: 0 auto 8px auto; 
    object-fit: contain; 
    border-bottom: 1px solid var(--border-color); 
    padding-bottom: 8px;
}
.bag-type-selector .bag-type-option span {
    font-size: 0.85em; 
    margin-top: 3px; line-height: 1.2; color: var(--text-color);
    display: block; text-align: center;
    width: 100%; 
}
.bag-type-selector .bag-type-option span small {
    font-size: 0.75em; color: #555; display: block; margin-top: 2px;
}
.bag-type-selector .bag-type-option.selected {
    border-color: var(--magenta); background-color: var(--light-magenta-bg);
    box-shadow: 0 0 10px rgba(255, 0, 255, 0.35);
}
.bag-type-selector .bag-type-option:hover:not(.selected) {
    border-color: var(--dark-magenta); background-color: #fef5fe;
}

/* Hide Spinner Arrows on Number Inputs */
input[type=number] { -moz-appearance: textfield !important; }
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
  -webkit-appearance: none !important; margin: 0 !important;
}

.dimension-group-outer {
    display: flex; flex-wrap: wrap; gap: 15px; 
    margin-bottom: 15px; justify-content: center; 
}
.dimension-input-container {
    display: flex; align-items: center; gap: 8px;
    padding: 6px 10px; border: 1px solid var(--border-color);
    border-radius: 6px; background-color: #fcfcff;
}
.dimension-input-container label {
    margin-bottom: 0; white-space: nowrap; font-size: 0.9em;
    color: var(--text-color); font-weight: normal;
}
.dimension-input-container input[type="number"] {
    width: 80px; padding: 8px 6px; text-align: right; font-size: 0.95em;
    border: 1px solid #ccc; border-radius: 4px; 
}
.unit-label { font-size: 0.85em; color: #555; }

button#calculateBtn {
    display: block; width: 100%; padding: 14px; 
    background-color: var(--primary-blue); color: var(--light-text-color);
    border: none; border-radius: 8px; cursor: pointer;
    font-size: 1.15em; font-weight: 600;
    transition: background-color 0.2s, transform 0.1s; margin-top: 25px;
}
button#calculateBtn:hover { background-color: var(--dark-primary-blue); }
button#calculateBtn:active { transform: translateY(1px); }

#resultArea {
    margin-top: 30px; padding: 20px 25px;
    background-color: var(--light-primary-blue-bg); 
    border: 1px solid var(--primary-blue); border-radius: 8px;
}
#resultArea h3 {
    margin-top: 0; margin-bottom: 15px; text-align: center;
    color: var(--primary-blue); font-size: 1.4em; font-weight: 600;
}
#capacityResultList { list-style: none; padding: 0; column-count: 2; column-gap: 25px; }
#capacityResultList li {
    padding: 5px 0; font-size: 0.95em;
    border-bottom: 1px dotted var(--primary-blue); opacity: 1; 
}
#capacityResultList li:first-of-type strong { font-weight: 600; color: var(--primary-blue); }
#capacityResultList li:first-of-type span.unit-text { color: var(--text-color); } 
#capacityResultList li strong { color: var(--primary-blue); } 
#capacityResultList li span.unit-text { color: var(--text-color); } 
#capacityResultList li:last-child { border-bottom: none; }

.disclaimer-specific { 
    font-size: 0.85em; color: #444; margin-top: 20px; 
    background-color: var(--note-bg-color); padding: 12px 15px; 
    border-radius: 6px; border-left: 5px solid var(--note-accent-color); 
    line-height: 1.5;
}

/* Styles for generic page content sections (about, privacy) */
.page-content { padding: 10px 0; }
.page-content h2 {
    color: var(--primary-blue); border-bottom: 2px solid var(--magenta);
    padding-bottom: 5px; margin-top: 20px; margin-bottom: 15px;
}
.page-content p { margin-bottom: 1em; line-height: 1.7; }
.page-content hr.content-hr {
    border: 0; height: 1px; background-color: var(--border-color);
    margin: 30px 0;
}
.page-content a { color: var(--primary-blue); text-decoration: none; }
.page-content a:hover { text-decoration: underline; color: var(--dark-primary-blue); }

/* Contact Form Specific Styles */
.form-group-contact { margin-bottom: 15px; }
.form-group-contact label {
    display: block; margin-bottom: 5px; font-weight: 500;
    color: var(--primary-blue);
}
.form-group-contact input[type="text"],
.form-group-contact input[type="email"],
.form-group-contact textarea {
    width: 100%; padding: 10px; border: 1px solid var(--border-color);
    border-radius: 6px; box-sizing: border-box; font-size: 1em;
    font-family: inherit; 
}
.form-group-contact textarea { resize: vertical; min-height: 100px; }
button.contact-submit-btn {
    display: inline-block; padding: 10px 20px;
    background-color: var(--primary-blue); color: var(--light-text-color);
    border: none; border-radius: 6px; cursor: pointer;
    font-size: 1em; font-weight: 500;
    transition: background-color 0.2s, transform 0.1s;
}
button.contact-submit-btn:hover { background-color: var(--dark-primary-blue); }
button.contact-submit-btn:active { transform: translateY(1px); }
#formStatus p { padding: 10px; margin-top: 15px; border-radius: 6px; font-size: 0.95em; }
.form-success {
    background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb;
}
.form-error {
    background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb;
}


/* Chart page specific */
.chart-section { margin-bottom: 35px; }
.chart-section h2, .chart-section h3 { 
    color: var(--primary-blue); border-bottom: 3px solid var(--magenta); 
    padding-bottom: 8px; margin-top: 0; margin-bottom: 10px; 
    font-weight: 600;
}
.chart-section > p { margin-bottom: 5px; font-size: 0.95em; } 
.chart-subtitle { font-size: 0.9em; color: #555; margin-bottom: 15px; text-align: center;}

table {
    width: 100%; border-collapse: collapse; margin-top: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    border-radius: 6px; overflow: hidden; table-layout: fixed; 
}
th, td {
    border: 1px solid var(--border-color); padding: 8px 6px; 
    text-align: left; font-size: 0.8em; 
    vertical-align: top; word-wrap: break-word; 
}
thead th { 
    background-color: var(--primary-blue); color: var(--light-text-color);
    font-weight: 500; white-space: normal; text-align: center;
    vertical-align: middle; 
}
thead th:first-child { width: 160px; font-size: 0.75em; } 

tbody tr:nth-child(odd) { background-color: #f8faff; }
tbody tr:nth-child(even) { background-color: var(--light-text-color); }
tbody tr:hover { background-color: var(--light-magenta-bg); }

.header-icon-text-container {
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    gap: 4px; padding: 5px 2px; 
    min-height: 90px; /* Increased min-height for taller icons */
}
.header-icon {
    display: block; 
    max-width: 50px; /* Max width for chart header icons */
    max-height: 67px; /* Max height for 222:300 ratio based on 50px width */
    width: auto;   
    height: auto;  
    object-fit: contain; 
}
.header-icon-text-container span {
    font-size: 0.8em; 
    line-height: 1.1; display: block; margin-top: 2px;
    text-align: center; 
}
.header-icon-text-container span small {
    font-size: 0.9em; 
    color: var(--light-primary-blue-bg); 
    display: block; margin-top: 1px;
}

/* Footer Styles */
footer {
    text-align: center; padding: 20px 0 10px 0; 
    margin-top: 30px; border-top: 1px solid var(--border-color);
    font-size: 0.85em; color: #666;
}
footer a { color: var(--primary-blue); text-decoration: none; margin: 0 5px; }
footer a:hover { text-decoration: underline; color: var(--dark-primary-blue); }
footer p { margin-top: 10px; font-size: 0.9em; }


@media (max-width: 768px) {
    .container { margin: 15px; padding: 20px; }
    header { margin-left: -20px; margin-right: -20px; }
    header h1 { font-size: 1.8em; }
    nav a { padding: 6px 10px; margin: 0 5px; }
    #capacityResultList { column-count: 1; }
    .dimension-input-container { flex-basis: calc(50% - 8px); }
    .dimension-input-container#depthInputContainer.visible { flex-basis: calc(50% - 8px); }
    
    .bag-type-selector { 
        grid-template-columns: repeat(auto-fit, minmax(110px, 1fr)); /* Revert to grid for better wrapping control on smaller screens */
        display: grid; /* Ensure it's grid */
        flex-wrap: unset; /* Remove flex-wrap if grid is used */
        overflow-x: unset; /* Remove overflow if grid is used */
    }
    .bag-type-selector .bag-type-option { width: auto; } /* Let grid control width */
    .bag-type-selector .bag-type-option img { /* Sizes already reduced, this rule might not be needed or can be fine-tuned */
        max-width: 100px; /* Further reduce for medium screens */
        max-height: 135px;
    }

    thead th:first-child { width: 100px; } 
    th, td { font-size: 0.75em; }
    .header-icon { max-width: 40px; max-height: 54px; } 
}

@media (max-width: 520px) {
    .bag-type-selector { 
        grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); 
    } 
    .bag-type-selector .bag-type-option img { 
        max-width: 90px; 
        max-height: 120px;
    }
    
    th, td { font-size: 0.65em; padding: 4px 2px; } 
    .header-icon { max-width: 30px; max-height: 40px; }
    .dimension-input-container,
    .dimension-input-container#depthInputContainer.visible {
        flex-basis: 100%; 
    }
    .unit-radio-buttons { flex-direction: column; align-items: stretch; }
    .unit-radio-buttons label { text-align: center; }
    thead th:first-child { width: 70px; font-size: 0.6em; } 
    .header-icon-text-container span { font-size: 0.75em; }
    .header-icon-text-container span small { font-size: 0.8em;}
}

.chart-unit-selector {
    margin-bottom: 20px;
    text-align: center; 
}

.chart-unit-selector label {
    margin-right: 10px;
    font-weight: 500;
    color: var(--primary-blue);
}

.chart-unit-selector select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.95em;
    background-color: #fff;
    min-width: 200px; 
}