:root {
    --primary-color: #1a365d; /* 信頼感のあるネイビー */
    --accent-color: #4a90e2; /* アクセントのブルー */
    --bg-color: #f5f7fa; /* ライトグレー */
    --card-bg: #ffffff; /* 白 */
    --text-main: #334155;
    --text-light: #64748b;
    --border-color: #e2e8f0;
}

* {
    box-sizing: border-box;
}

body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

header {
    background-color: var(--primary-color);
    color: white;
    padding: 2rem 1rem;
}

.header-inner {
    max-width: 1000px;
    margin: 0 auto;
}

h1 {
    margin: 0 0 1.5rem 0;
    font-size: 1.75rem;
    font-weight: bold;
    letter-spacing: 0.05em;
    text-align: center;
}

.notice {
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    font-size: 0.9rem;
}

.notice-term {
    font-weight: bold;
    color: #fbbf24; /* 注意を引くイエロー */
    margin: 0 0 0.5rem 0;
    font-size: 1rem;
}

.notice-desc {
    margin: 0;
    opacity: 0.9;
}

main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 3rem 1rem;
}

section {
    margin-bottom: 4rem;
}

.section-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    border-bottom: 3px solid var(--primary-color);
    padding-bottom: 0.5rem;
    margin-bottom: 2rem;
    display: inline-block;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.card-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 0 0 0.5rem 0;
}

.card-subtitle {
    font-size: 0.9rem;
    color: var(--text-light);
    margin: 0;
    font-weight: bold;
}

.chart-container {
    position: relative;
    height: 220px;
    width: 100%;
    margin-bottom: 2rem;
}

/* アコーディオン */
.accordion {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    margin-bottom: 2rem;
    overflow: hidden;
}

.accordion-item {
    border-bottom: 1px solid var(--border-color);
}

.accordion-item:last-child {
    border-bottom: none;
}

.accordion-header {
    background-color: #f8fafc;
    padding: 1rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    font-size: 0.95rem;
    transition: background-color 0.2s;
    user-select: none;
}

.accordion-header:hover {
    background-color: #e2e8f0;
}

.accordion-header-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.accordion-badge {
    background-color: var(--primary-color);
    color: white;
    padding: 0.1rem 0.5rem;
    border-radius: 99px;
    font-size: 0.8rem;
}

.accordion-icon {
    color: var(--text-light);
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.accordion-item.is-open .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    display: none;
    padding: 1rem;
    background-color: white;
    font-size: 0.9rem;
}

.accordion-item.is-open .accordion-content {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

.accordion-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.accordion-content li {
    display: flex;
    justify-content: space-between;
    padding: 0.6rem 0;
    border-bottom: 1px dashed var(--border-color);
}

.accordion-content li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.accordion-content .value {
    font-weight: bold;
    color: var(--primary-color);
}

.btn {
    display: block;
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    text-decoration: none;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: bold;
    transition: all 0.2s;
    margin-top: auto;
}

.btn:hover {
    background-color: var(--primary-color);
    color: white;
}

footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-light);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* スマホ用微調整 */
@media (max-width: 600px) {
    .card-container {
        grid-template-columns: 1fr;
    }
    .chart-container {
        height: 200px;
    }
}