/* デザイン変数 */
:root {
    --main-dark: #0f172a;    /* 深みのあるネイビー */
    --accent-gold: #c2a35d;  /* 落ち着いたゴールド */
    --text-white: #f8fafc;
    --text-muted: #94a3b8;
    --card-bg: #1e293b;
    --font-serif: 'Noto Serif JP', serif;
    --font-sans: 'Noto Sans JP', sans-serif;
}

/* 基本リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background-color: var(--main-dark);
    color: var(--text-white);
    font-family: var(--font-sans);
    line-height: 1.8;
    overflow-x: hidden;
}

/* ヘッダー */
header {
    height: 90px;
    display: flex;
    align-items: center;
    background-color: rgba(15, 23, 42, 0.95);
    border-bottom: 1px solid rgba(194, 163, 93, 0.3);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    padding: 0 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    color: var(--accent-gold);
    letter-spacing: 2px;
    text-transform: uppercase;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 40px;
}

nav a {
    text-decoration: none;
    color: var(--text-white);
    font-size: 0.9rem;
    font-weight: 500;
    transition: 0.3s;
}

nav a:hover {
    color: var(--accent-gold);
}

/* ヒーローセクション */
.hero {
    display: flex;
    align-items: center;
    min-height: 80vh;
    padding: 60px 5%;
    gap: 5%;
}

.hero-img {
    flex: 1;
}

.hero-img img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    border-radius: 4px;
    filter: sepia(30%) contrast(110%);
}

.hero-content {
    flex: 1;
}

.hero-content h1 {
    font-family: var(--font-serif);
    font-size: 3rem;
    line-height: 1.4;
    margin-bottom: 30px;
}

.gold {
    color: var(--accent-gold);
}

.hero-content p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 500px;
}

/* アラートセクション */
.alert-section {
    padding: 100px 20px;
    background-color: #0c1221;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 70px;
}

.section-title h2 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    color: var(--accent-gold);
    margin-bottom: 10px;
}

.alert-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.alert-card {
    background-color: var(--card-bg);
    padding: 40px;
    border-top: 4px solid var(--accent-gold);
    transition: 0.3s;
}

.alert-card:hover {
    transform: translateY(-10px);
    background-color: #27354d;
}

.type {
    display: block;
    font-size: 0.8rem;
    color: var(--accent-gold);
    margin-bottom: 15px;
    font-weight: 700;
}

.alert-card h3 {
    font-size: 1.25rem;
    margin-bottom: 20px;
}

.alert-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* 対策セクション */
.measure-section {
    padding: 120px 0;
}

.measure-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.measure-box {
    display: flex;
    background-color: var(--card-bg);
    align-items: stretch;
}

.measure-text {
    flex: 1;
    padding: 80px;
}

.measure-text h2 {
    font-family: var(--font-serif);
    font-size: 2.2rem;
    margin-bottom: 40px;
}

.check-list {
    list-style: none;
}

.check-list li {
    font-size: 1.2rem;
    margin-bottom: 25px;
    display: flex;
    align-items: center;
}

.check-list li span {
    color: var(--accent-gold);
    font-family: var(--font-serif);
    margin-right: 20px;
    font-size: 1.5rem;
}

.measure-img {
    flex: 1;
}

.measure-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* フッター */
footer {
    padding: 80px 20px;
    text-align: center;
    border-top: 1px solid rgba(194, 163, 93, 0.2);
}

footer p {
    font-size: 1.1rem;
    color: var(--accent-gold);
    margin-bottom: 20px;
}

.copyright {
    color: var(--text-muted) !important;
    font-size: 0.8rem !important;
}

/* レスポンシブ */
@media (max-width: 900px) {
    .hero {
        flex-direction: column;
        padding-top: 40px;
    }
    .hero-img {
        margin-bottom: 40px;
    }
    .alert-grid {
        grid-template-columns: 1fr;
    }
    .measure-box {
        flex-direction: column;
    }
    .measure-text {
        padding: 40px;
    }
}