/* General Body and Container */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333333;
    display: flex;
    flex-direction: column; 
    align-items: center; 
    min-height: 100vh;
    margin: 0;
    padding: 0; 
}

/* Page Header Style */
.site-header {
    width: 100%;
    background-color: #ffffff;
    color: #333333; 
    padding: 20px 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05); 
    position: sticky;
    top: 0;
    z-index: 100; 
}
.header-content {
    width: 95%;
    max-width: 600px;
    margin: 0 auto;
    text-align: left; 
}
.site-header h1 {
    margin: 0;
    font-size: 1.6em;
    color: #1abc9c; 
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}
.site-header .subtitle {
    color: #7f8c8d; 
    margin: 5px 0 0;
    font-size: 0.9em;
}

/* Main Container Style */
.container {
    background-color: #ffffff;
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    width: 95%;
    max-width: 600px; 
    margin: 0 auto 30px auto; 
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.9em;
    color: #7f8c8d;
    margin-bottom: 20px;
}
.breadcrumb a {
    color: #7f8c8d;
    text-decoration: none;
    transition: color 0.3s;
}
.breadcrumb a:hover {
    color: #333333;
    text-decoration: underline;
}
.breadcrumb span {
    color: #7f8c8d;
}


h2 {
    font-size: 1.3em;
    color: #34495e; 
    border-left: 5px solid #16a085; 
    padding-left: 10px;
    margin: 0 0 20px;
    display: flex;
    align-items: center;
}
h2 .icon {
    margin-right: 8px;
    font-size: 1.0em;
}

.notice {
    font-size: 0.8em;
    color: #7f8c8d;
    margin-top: 5px;
    margin-bottom: 5px;
}

/* Inputs */
.controls-wrapper {
    background-color: #f8f9fa; 
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid #e8f8f5; 
}
.simulation-wrapper {
    background-color: #e8f8f5; 
    border: 1px dashed #1abc9c;
}

.input-group {
    margin-bottom: 20px;
}
.input-group:last-child {
    margin-bottom: 0;
}
.input-group-row {
    display: flex;
    gap: 15px;
    margin-bottom: 20px;
}
.input-group-row .input-group {
    flex: 1;
    margin-bottom: 0;
}

.input-group label {
    display: block;
    font-weight: bold;
    color: #555555;
    margin-bottom: 8px;
    font-size: 0.95em;
}
.required {
    font-size: 0.7em;
    background: #e74c3c; 
    color: #fff;
    padding: 2px 6px;
    border-radius: 3px;
    margin-left: 5px;
    vertical-align: middle;
}
.optional-group label {
    color: #7f8c8d;
}

.input-group input[type="number"] {
    padding: 12px;
    font-size: 16px;
    border: 1px solid #dddddd;
    border-radius: 5px;
    width: 100%;
    box-sizing: border-box;
    transition: border-color 0.3s;
    background-color: #ffffff;
}
.input-group input[type="number"]:focus {
    border-color: #1abc9c;
    outline: none;
    box-shadow: 0 0 0 3px rgba(26, 188, 156, 0.1);
}

/* Toggle Switch Area */
.comparison-toggle-area {
    margin: 0 0 10px;
    text-align: center;
}
.toggle-label {
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    color: #34495e;
    font-weight: bold;
    user-select: none;
    padding: 10px;
    border-radius: 5px;
    transition: background 0.2s;
    background-color: #fff;
    border: 1px solid #dddddd;
}
.toggle-label:hover {
    background-color: #f0fdfa;
    border-color: #1abc9c;
}
.toggle-label input {
    margin-right: 10px;
    transform: scale(1.3);
    accent-color: #1abc9c;
}

/* Buttons */
.main-btn {
    padding: 16px 20px;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    box-sizing: border-box;
    background-color: #1abc9c; 
    color: #fff;
    box-shadow: 0 4px 0 #16a085; 
    margin-top: 10px;
}
.main-btn:hover {
    background-color: #16a085;
    transform: translateY(-1px);
}
.main-btn:active {
    transform: translateY(3px);
    box-shadow: none;
}

/* Results Area */
.result-container {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 2px solid #16a085;
    animation: fadeIn 0.6s ease;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(15px); }
    to { opacity: 1; transform: translateY(0); }
}

.analysis-section {
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px dashed #dddddd;
}
.analysis-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}
.section-subtitle {
    font-size: 1.1em;
    color: #2c3e50;
    margin-bottom: 15px;
    font-weight: bold;
    display: flex;
    align-items: center;
}

/* Result Grid */
.results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}
.result-card {
    background: #fff;
    border: 1px solid #dddddd;
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
}
.result-card.highlight {
    border: 2px solid #1abc9c;
    background-color: #f0fdfa;
}
.card-label {
    display: block;
    font-size: 0.85em;
    color: #7f8c8d;
    margin-bottom: 5px;
    font-weight: bold;
}
.card-value {
    display: block;
    font-size: 1.8em;
    font-weight: bold;
    color: #2c3e50;
}
.card-unit {
    font-size: 0.5em;
    color: #7f8c8d;
    margin-left: 2px;
    vertical-align: middle;
}

/* Step Breakdown List */
.step-breakdown-list {
    background-color: #fff;
    border: 1px solid #dddddd;
    border-radius: 8px;
    padding: 15px 20px;
}
.breakdown-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 0;
    border-bottom: 1px dashed #eee;
}
.breakdown-row:last-child {
    border-bottom: none;
    padding-bottom: 0;
}
.breakdown-name {
    font-weight: bold;
    color: #555;
    font-size: 0.95em;
}
.breakdown-val {
    font-weight: bold;
    color: #2c3e50;
}

/* Chart */
.chart-container {
    position: relative;
    height: 300px; 
    width: 100%;
    background: #fff;
    border-radius: 8px;
    border: 1px solid #f0f0f0;
    padding: 10px;
    box-sizing: border-box;
}

/* Usage Notes Area (New) */
.usage-notes-container {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid #dddddd;
}
.usage-notes-title {
    font-size: 1.0em;
    font-weight: bold;
    color: #34495e;
    margin: 0 0 10px 0;
}
.usage-notes-list {
    margin: 0;
    padding-left: 20px;
    color: #555555;
    font-size: 0.85em;
    line-height: 1.6;
}
.usage-notes-list li {
    margin-bottom: 5px;
}

/* Utility */
.hidden {
    display: none !important;
}

/* Footer */
.page-footer {
    width: 100%;
    background-color: #34495e; 
    color: #dddddd;
    padding: 30px 0;
    margin-top: auto; 
}
.footer-content {
    max-width: 600px;
    width: 95%;
    margin: 0 auto; 
    padding: 0 10px;
}

/* Footer Layout Updates */
.footer-links-row {
    display: flex;
    justify-content: flex-start;
    gap: 40px; /* Space between columns */
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.footer-section {
    /* Previously had margin-bottom, handled by row gap/margin now if needed */
}

.footer-section .section-title {
    font-size: 1.0em;
    font-weight: bold;
    color: #1abc9c; 
    margin: 0 0 10px 0;
}

.footer-link-text {
    margin: 0;
    font-size: 0.9em;
}
.footer-link-text a {
    color: #ffffff;
    text-decoration: none;
    transition: opacity 0.3s;
}
.footer-link-text a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.copyright {
    text-align: center;
    font-size: 0.8em;
    color: #95a5a6;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #556c80;
}

/* Responsive */
@media (max-width: 650px) {
    .container { padding: 15px; }
    .input-group-row { flex-direction: column; gap: 0; }
    .results-grid { grid-template-columns: 1fr; }
    
    /* Stack footer columns on small screens */
    .footer-links-row {
        flex-direction: column;
        gap: 20px;
    }
}