:root {
    --primary-color: #0d1b2a; /* 深いネイビー */
    --accent-color: #1b4965;  /* 落ち着いたブルー */
    --tech-green: #2a9d8f;    /* アクセント色 */
    --bg-light: #f8f9fa;      /* 薄いグレー */
    --text-main: #2d3436;
    --text-light: #636e72;
    --font-en: 'Montserrat', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--font-jp);
    color: var(--text-main);
    line-height: 1.7;
    background-color: #ffffff;
}

/* Header */
.header {
    position: fixed; top: 0; width: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    z-index: 1000;
    border-bottom: 1px solid #eee;
}

.header-inner {
    max-width: 1100px; margin: 0 auto; padding: 15px 20px;
    display: flex; justify-content: space-between; align-items: center;
}

.logo { font-family: var(--font-en); font-weight: 700; color: var(--primary-color); font-size: 1.2rem; }
.nav ul { list-style: none; display: flex; gap: 24px; }
.nav a { font-family: var(--font-en); font-weight: 700; font-size: 0.85rem; color: var(--text-light); text-decoration: none; transition: 0.3s; }
.nav a:hover { color: var(--primary-color); }

/* Hero */
.hero {
    height: 100vh; display: flex; align-items: center; justify-content: center; text-align: center;
    background: linear-gradient(135deg, #ffffff 0%, #f1f4f8 100%);
    padding-top: 60px;
}

.hero-title { font-size: 4rem; color: var(--primary-color); margin-bottom: 15px; font-weight: 700; letter-spacing: -1px; }
.hero-subtitle { font-size: 1.5rem; font-weight: 700; color: var(--accent-color); margin-bottom: 25px; }
.hero-desc { color: var(--text-light); max-width: 650px; margin: 0 auto 40px; font-size: 1.1rem; }

/* Sections */
.section { padding: 120px 0; }
.bg-light { background-color: var(--bg-light); }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.section-title { font-size: 2.2rem; margin-bottom: 50px; text-align: center; color: var(--primary-color); position: relative; }
.section-title::after { content: ""; position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%); width: 40px; height: 3px; background: var(--tech-green); }

/* Buttons */
.btn { display: inline-block; padding: 14px 34px; font-weight: 700; border-radius: 4px; transition: 0.3s; text-decoration: none; font-size: 0.95rem; }
.btn-primary { background-color: var(--primary-color); color: white; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-2px); }
.btn-outline { border: 2px solid var(--primary-color); color: var(--primary-color); }
.btn-outline:hover { background-color: var(--primary-color); color: white; }

/* Content Grids */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-image-placeholder { background-color: #dfe6e9; height: 320px; display: flex; align-items: center; justify-content: center; border-radius: 12px; color: #b2bec3; font-weight: 700; }

.cards-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.action-card {
    background-color: white; padding: 60px 40px; border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.05); border: 1px solid #f1f1f1; position: relative; transition: 0.3s;
}
.action-card:hover { transform: translateY(-8px); box-shadow: 0 20px 45px rgba(0,0,0,0.08); }
.highlight-card { border-top: 5px solid var(--tech-green); }
.badge { position: absolute; top: 25px; right: 25px; background: var(--tech-green); color: white; padding: 5px 14px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; }
.card-title { font-size: 1.8rem; margin-bottom: 15px; color: var(--primary-color); }
.card-desc { color: var(--text-light); margin-bottom: 35px; }

/* Footer */
.footer-section { background-color: var(--primary-color); color: white; padding: 80px 0 40px; text-align: center; }
.social-links { display: flex; justify-content: center; gap: 24px; margin-bottom: 40px; }
.social-btn { padding: 12px 28px; border: 1px solid rgba(255,255,255,0.2); border-radius: 4px; color: white; text-decoration: none; transition: 0.3s; font-size: 0.9rem; }
.social-btn:hover { background: white; color: var(--primary-color); }
.copyright { font-size: 0.8rem; opacity: 0.5; margin-top: 40px; }

@media (max-width: 768px) {
    .hero-title { font-size: 2.6rem; }
    .about-grid, .cards-grid { grid-template-columns: 1fr; }
}

/* --- Campaign Styles --- */
.campaign-box {
    background: #f8f9fa;
    border: 2px solid var(--primary-color);
    border-radius: 16px;
    padding: 40px;
    position: relative;
    overflow: hidden;
}

.campaign-badge {
    display: inline-block;
    background: #e63946; /* 注意を引く赤系アクセント */
    color: white;
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.campaign-title {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.campaign-text {
    line-height: 1.8;
    color: var(--text-color);
    margin-bottom: 25px;
}

.campaign-highlight {
    background: white;
    border-left: 5px solid var(--accent-color);
    padding: 20px;
    border-radius: 0 8px 8px 0;
}

.campaign-period {
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 5px;
}

.campaign-price {
    font-size: 1.2rem;
    font-weight: 700;
}

.campaign-price span {
    color: #e63946;
    font-size: 1.8rem;
    margin: 0 5px;
}

@media (max-width: 768px) {
    .campaign-box {
        padding: 30px 20px;
    }
    .campaign-title {
        font-size: 1.25rem;
    }
    .campaign-price {
        font-size: 1rem;
    }
    .campaign-price span {
        font-size: 1.5rem;
    }
}
/* --- About Workflow Styles --- */
.about-workflow {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.workflow-step {
    display: flex;
    align-items: center;
    background: #fff;
    padding: 15px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.workflow-step:hover {
    transform: translateX(5px);
}

.step-number {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
    background: #f0f2f5;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin-right: 15px;
    flex-shrink: 0;
}

.step-info h4 {
    margin: 0 0 5px 0;
    font-size: 1rem;
    color: var(--primary-color);
}

.step-info p {
    margin: 0;
    font-size: 0.85rem;
    line-height: 1.4;
    color: #666;
}

/* 最後のステップを目立たせる */
.highlight-step {
    border: 2px solid var(--accent-color);
    background: #fffdf5;
}

.highlight-step .step-number {
    background: var(--accent-color);
    color: white;
}

@media (max-width: 768px) {
    .about-workflow {
        margin-top: 30px;
    }
}

/* キャンペーン画像エリアのレイアウト */
.campaign-images {
    display: flex;
    gap: 20px;
    margin: 30px 0;
    justify-content: center;
    flex-wrap: wrap; /* スマホでは縦並びにする */
}

.image-item {
    flex: 1;
    min-width: 280px; /* これより狭くなると縦に並ぶ */
    max-width: 450px;
}

.image-item img {
    width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

/* マウスを置いた時に少し浮き上がる演出（PC用） */
.image-item img:hover {
    transform: translateY(-5px);
}

/* スマホ用の微調整 */
@media (max-width: 600px) {
    .campaign-images {
        gap: 15px;
    }
    .image-item {
        min-width: 100%; /* スマホでは1枚ずつ全幅表示 */
    }
}