:root {
    --primary-orange: #ff9800; /* 旅の活気 */
    --sky-blue: #00bcd4; /* 空と海 */
    --stamp-red: #e91e63; /* スタンプの印影 */
    --bg-sand: #fefaf0; /* 明るい紙の色 */
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-sand);
    color: #444;
}

h1, h2, h3, .navbar-brand {
    font-family: 'M PLUS Rounded 1c', sans-serif;
    font-weight: 700;
}

/* --- Header --- */
.navbar { background: rgba(255,255,255,0.95); backdrop-filter: blur(5px); box-shadow: 0 2px 15px rgba(0,0,0,0.05); }
.navbar-brand img { filter: drop-shadow(0 2px 2px rgba(0,0,0,0.1)); }

/* --- Hero Section --- */
.hero {
    background: linear-gradient(135deg, #81e6d9 0%, #a3de83 100%);/*デフォルト＝background: linear-gradient(135deg, #00bcd4 0%, #4caf50 100%);*/
    color: white;
    padding: 80px 0 60px;
    text-align: center;
    border-bottom-left-radius: 50% 10%;
    border-bottom-right-radius: 50% 10%;
}
.hero h1 { font-size: 2.5rem; text-shadow: 2px 2px 4px rgba(0,0,0,0.2); }
.hero p { font-size: 1.1rem; opacity: 0.9; }

/* --- Video & Carousel --- */
.card-container {
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    padding: 30px;
    margin-top: -50px;
}
.video-wrapper { border-radius: 15px; overflow: hidden; box-shadow: 0 5px 15px rgba(0,0,0,0.1); }

/* --- Course Cards --- */
.course-card {
    border: none;
    border-radius: 15px;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    background: #fff;
    overflow: hidden;
    height: 100%;
}
.course-card:hover { transform: translateY(-10px); box-shadow: 0 15px 30px rgba(0,0,0,0.15); }
.course-card img { height: 180px; object-fit: cover; }
.course-title { font-size: 0.9rem; font-weight: bold; padding: 10px; color: var(--primary-orange); }

/* --- Sections --- */
section { padding: 60px 0; }
.section-title {
    text-align: center;
    margin-bottom: 40px;
    color: var(--sky-blue);
    display: flex;
    align-items: center;
    justify-content: center;
}
.section-title::before, .section-title::after {
    content: ""; width: 50px; height: 2px; background: var(--sky-blue); margin: 0 15px;
}

/* --- Category Icons --- */
.btn-category {
    background: #fff;
    border: 2px solid var(--sky-blue);
    color: var(--sky-blue);
    border-radius: 50px;
    padding: 10px 25px;
    font-weight: bold;
    transition: 0.3s;
    text-decoration: none;
    display: inline-block;
    margin: 5px;
}
.btn-category:hover { background: var(--sky-blue); color: #fff; }

/* --- Footer --- */
footer { background: #37474f; color: #cfd8dc; padding: 60px 0 60px; }
footer a { color: #fff; text-decoration: none; opacity: 0.7; }
footer a:hover { opacity: 1; }
.footer-logo { font-size: 1.5rem; color: #fff; margin-bottom: 20px; }
.css_altbox {
	display:none;border:1px solid #000;padding:4px;width:280px;background-color: #b0c4de;
}
.altbox_close{
	margin: 5px;
	padding :10px;
	font-size: 25px;
}
.pd5 {
	padding :5px;
}
.white{
	color: #fff;
}