/* =========================================
   Variables & Reset
   ========================================= */
:root {
    --primary-dark: #16a085;
    --primary-main: #1abc9c;
    --primary-light: #e8f8f5;
    --neutral-dark-blue: #2c3e50;
    --neutral-slate-blue: #34495e;
    --neutral-dark-gray: #333333;
    --neutral-mid-gray: #555555;
    --neutral-light-gray: #7f8c8d;
    --neutral-border: #dddddd;
    --neutral-off-white: #f8f9fa;
    --neutral-white: #ffffff;
    --semantic-red: #e74c3c;
    --semantic-blue: #3498db;
    --semantic-ash: #95a5a6;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--neutral-off-white);
    color: var(--neutral-dark-gray);
    display: flex;
    flex-direction: column; 
    align-items: center; 
    min-height: 100vh;
    margin: 0;
    padding: 0; 
}

/* =========================================
   Header & Footer
   ========================================= */
.site-header {
    width: 100%;
    background-color: var(--neutral-white);
    color: var(--neutral-dark-gray);
    padding: 15px 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05); 
    position: sticky;
    top: 0;
    z-index: 100; 
}
.header-content, .footer-content { width: 95%; max-width: 960px; margin: 0 auto; }
.site-header h1 { margin: 0; font-size: 1.6em; color: var(--primary-main); letter-spacing: 1px; }
.site-header .subtitle { color: var(--neutral-light-gray); margin: 0; font-size: 0.85em; font-weight: normal; }

.container {
    background-color: var(--neutral-white);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    width: 95%;
    max-width: 960px;
    margin: 0 auto 40px auto; 
    box-sizing: border-box;
}

/* Breadcrumbs */
.breadcrumbs { font-size: 0.9em; color: var(--neutral-light-gray); margin-bottom: 25px; border-bottom: 1px solid var(--neutral-border); padding-bottom: 10px; }
.breadcrumbs ol { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; }
.breadcrumbs li + li::before { content: ">"; margin: 0 8px; font-size: 0.8em; }
.breadcrumbs a { color: var(--neutral-light-gray); text-decoration: none; }
.breadcrumbs a:hover { text-decoration: underline; }

h2 { 
    font-size: 1.3em; 
    color: var(--neutral-slate-blue);
    border-left: 5px solid var(--primary-dark);
    padding-left: 10px; 
    margin: 25px 0 15px; 
}
h3 { font-size: 1.1em; color: var(--neutral-dark-blue); margin-top: 0; }
h4 { font-size: 0.85em; margin: 0 0 10px 0; color: var(--semantic-blue); font-weight: bold; }

.notice { font-size: 0.85em; color: var(--neutral-light-gray); margin: 5px 0 15px; }

/* =========================================
   Inputs & Grid
   ========================================= */
.controls-wrapper {
    background-color: var(--neutral-off-white);
    padding: 20px; 
    border-radius: 8px; 
    margin-bottom: 20px; 
    border: 1px solid var(--primary-light);
}

.common-settings-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}
.common-settings-row .input-group { flex: 1; min-width: 200px; }

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.scenario-card {
    background-color: var(--neutral-white);
    border: 1px solid var(--neutral-border);
    border-radius: 6px;
    padding: 20px;
    position: relative;
    box-shadow: 0 2px 4px rgba(0,0,0,0.03);
    transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.scenario-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.08);
    border-color: var(--primary-main);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--neutral-off-white);
}
.card-title { font-weight: bold; color: var(--neutral-dark-blue); font-size: 1.1em; margin: 0; }

.remove-card-btn {
    background: transparent;
    color: var(--neutral-light-gray);
    border: none;
    font-size: 1.8em;
    line-height: 1;
    cursor: pointer;
    padding: 0;
}
.remove-card-btn:hover { color: var(--semantic-red); }

/* Selector & Details */
.selector-area { margin-bottom: 15px; }
.preset-select { width: 100%; padding: 10px; border-radius: 4px; border: 1px solid var(--neutral-border); background: var(--neutral-off-white); font-weight: bold; }

.details-area {
    background-color: var(--neutral-off-white);
    padding: 15px;
    border-radius: 4px;
    display: none; 
}
.details-area.active { display: block; animation: fadeIn 0.3s; }

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.input-group { margin-bottom: 15px; }
.input-group:last-child { margin-bottom: 0; }
.input-group label {
    display: block;
    font-size: 0.8em;
    color: var(--neutral-mid-gray);
    margin-bottom: 5px;
    font-weight: bold;
}
.input-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--neutral-border);
    border-radius: 4px;
    font-size: 14px;
    box-sizing: border-box;
}
.input-group input:focus { outline: none; border-color: var(--primary-main); }

/* 注釈テキスト */
.helper-text {
    font-size: 0.75em;
    color: var(--semantic-ash);
    margin-top: 4px;
    line-height: 1.3;
}

/* 従量・延長設定用 */
.optional-section {
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px dashed var(--neutral-border);
}
.inline-inputs {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}
.inline-inputs input { width: 80px; }
.unit-label { font-size: 0.8em; color: var(--neutral-mid-gray); }

.hidden-field { display: none !important; }

/* Buttons */
.main-btn, .sub-btn { 
    padding: 14px 20px; 
    font-size: 1em; 
    font-weight: bold; 
    border: none; 
    border-radius: 4px; 
    cursor: pointer; 
    width: 100%; 
    box-sizing: border-box; 
    margin-top: 10px;
    text-align: center;
}
.main-btn { background-color: var(--primary-main); color: var(--neutral-white); box-shadow: 0 4px 6px rgba(26, 188, 156, 0.2); }
.main-btn:hover { background-color: var(--primary-dark); }
.sub-btn { background-color: var(--neutral-slate-blue); color: var(--neutral-white); width: auto; display: inline-block; padding: 10px 20px; }
.sub-btn:hover { background-color: var(--neutral-dark-blue); }
.sub-btn.disabled { background-color: var(--neutral-light-gray); cursor: not-allowed; opacity: 0.6; }

/* =========================================
   Result Area
   ========================================= */
.result-container { margin-top: 40px; padding-top: 20px; border-top: 2px dashed var(--primary-light); }
.result-container.hidden { display: none; }
.chart-container { position: relative; width: 100%; height: 400px; margin-bottom: 30px; }

.comparison-table { width: 100%; border-collapse: collapse; font-size: 0.9em; margin-bottom: 10px; }
.comparison-table th, .comparison-table td { padding: 12px 8px; border: 1px solid var(--neutral-border); text-align: center; }
.comparison-table th { background-color: var(--primary-light); color: var(--neutral-dark-blue); font-weight: bold; }
.comparison-table td:first-child { text-align: left; font-weight: bold; color: var(--neutral-dark-blue); }
.table-note { font-size: 0.75em; color: var(--neutral-light-gray); text-align: right; }
.summary-table-wrapper { overflow-x: auto; }

/* =========================================
   Usage Notes (Body Bottom)
   ========================================= */
.usage-notes {
    margin-top: 50px;
    padding-top: 20px;
    border-top: 1px solid var(--neutral-border);
}
.usage-notes h3 {
    font-size: 1em;
    font-weight: bold;
    color: var(--neutral-dark-blue);
    margin-bottom: 10px;
}
.usage-notes ul {
    list-style: disc;
    padding-left: 20px;
    margin: 0;
}
.usage-notes li {
    font-size: 0.85em;
    color: var(--neutral-mid-gray);
    margin-bottom: 5px;
    line-height: 1.5;
}

/* =========================================
   Page Footer
   ========================================= */
.page-footer {
    width: 100%;
    background-color: var(--neutral-slate-blue); 
    color: var(--neutral-border);
    padding: 30px 0;
    margin-top: auto; 
}
.footer-links-row {
    display: flex;
    flex-wrap: wrap;
    gap: 40px; /* 横並び時の間隔 */
    margin-bottom: 20px;
}
.footer-section {
    min-width: 150px;
}
.footer-section .section-title { 
    font-size: 1em; 
    font-weight: bold; 
    color: var(--primary-main); 
    margin: 0 0 10px 0; 
}
.footer-section ul { list-style: none; padding: 0; margin: 0; }
.footer-section li a { color: var(--neutral-border); text-decoration: none; font-size: 0.9em; }
.footer-section li a:hover { color: var(--neutral-white); text-decoration: underline; }

.copyright { 
    text-align: center; 
    font-size: 0.8em; 
    color: var(--semantic-ash); 
    margin-top: 20px; 
    padding-top: 20px; 
    border-top: 1px solid rgba(255,255,255,0.1); 
}

@media (min-width: 1024px) {
    .header-content, .container, .footer-content { width: 80%; }
}
@media (max-width: 650px) {
    .container { padding: 15px; width: 100%; border-radius: 0; }
    .common-settings-row { flex-direction: column; gap: 10px; }
    .chart-container { height: 300px; }
    .inline-inputs { flex-wrap: wrap; }
    
    /* Footer Mobile: Stack vertically */
    .footer-links-row {
        flex-direction: column;
        gap: 20px;
    }
}