:root {
    --primary: #3498db;
    --accent: #f39c12;
    --bg-color: #f7f9fb;
    --table-header: #34495e;
}

body {
    font-family: "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    background-color: var(--bg-color);
    color: #333;
    line-height: 1.6;
}

.disclaimer {
    background: #ddd;
    text-align: center;
    font-size: 0.8rem;
    padding: 5px;
    color: #666;
}

header {
    background: #fff;
    padding: 1rem 5%;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    color: var(--primary);
    font-weight: bold;
    font-size: 1.3rem;
}

nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

nav a {
    text-decoration: none;
    color: #555;
    font-weight: bold;
}

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

.container {
    max-width: 950px;
    margin: 2rem auto;
    padding: 0 20px;
}

/* ヒーローエリア */
.school-hero {
    background: linear-gradient(135deg, #e0f2fe, #bae6fd);
    padding: 30px;
    border-radius: 20px;
    text-align: center;
    margin-bottom: 40px;
}

.school-hero h2 {
    color: #0369a1;
    margin-top: 0;
}

.all-grades-notice {
    font-weight: bold;
    color: #e67e22;
    background: white;
    display: inline-block;
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.9rem;
    margin-top: 10px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

/* 時間割 */
.section-title {
    color: var(--table-header);
    text-align: center;
    font-size: 1.6rem;
    margin-bottom: 5px;
}

.schedule-desc {
    text-align: center;
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.table-wrapper {
    background: white;
    padding: 20px;
    border-radius: 20px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    overflow-x: auto;
}

.timetable {
    width: 100%;
    border-collapse: separate;
    border-spacing: 5px; 
    min-width: 600px;
}

.timetable th, .timetable td {
    padding: 12px 8px;
    text-align: center;
    font-weight: bold;
    border-radius: 8px;
    font-size: 0.95rem;
}

.timetable th {
    background-color: var(--table-header);
    color: white;
}

.period {
    background-color: #f1f5f9;
    color: #475569;
    width: 50px;
}

/* 科目ごとの背景カラー */
.koku        { background-color: #fee2e2; color: #b91c1c; } 
.math        { background-color: #ffedd5; color: #c2410c; } 
.taiiku      { background-color: #dcfce7; color: #15803d; } 
.music       { background-color: #fef9c3; color: #a16207; } 
.eng         { background-color: #ccfbf1; color: #0f766e; } 
.nihon       { background-color: #e0f2fe; color: #0369a1; } 

.sanpo       { background-color: #fef3c7; color: #b45309; } 
.switch      { background-color: #e0e7ff; color: #4338ca; } 
.cook        { background-color: #fae8ff; color: #a21caf; } 
.sleep       { background-color: #f1f5f9; color: #475569; } 

.club        { background-color: #f5f5f4; color: #44403c; } 
.fun         { background-color: #ffdadb; color: #c026d3; } 
.yt          { background-color: #ffe4e6; color: #e11d48; } 

.toilet      { background-color: #e0f2fe; color: #0284c7; } 
.clean       { background-color: #f0fdf4; color: #16a34a; } 
.game        { background-color: #f3e8ff; color: #9333ea; } 

.free        { background-color: #ecfdf5; color: #059669; } 
.lab         { background-color: #fff1f2; color: #be123c; } 
.phone       { background-color: #e0f7fa; color: #00838f; } 

.bu活        { background-color: #f1f5f9; color: #334155; border: 1px solid #cbd5e1; }
.math-study  { background-color: #fef3c7; color: #d97706; }
.math-study2 { background-color: #fde68a; color: #b45309; }
.play        { background-color: #dbeafe; color: #1d4ed8; }
.secret      { background-color: #34495e; color: #ffffff; } 

/* 昼休みの行 */
.lunch-row td {
    background-color: #fff7ed;
    color: #c2410c;
    letter-spacing: 2px;
}

footer {
    text-align: center;
    padding: 2rem;
    margin-top: 50px;
    color: #999;
    font-size: 0.9rem;
}
/* 学校説明セクション用のスタイル */
.school-description {
    margin-bottom: 50px;
}

.desc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.desc-card {
    background: white;
    padding: 20px;
    border-radius: 15px; /* 角を丸く */
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    border-top: 4px solid var(--primary); /* 上側に青いアクセントライン */
}

.desc-card h4 {
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.1rem;
    color: #0369a1;
}

.desc-card p {
    margin: 0;
    font-size: 0.9rem;
    color: #555;
    line-height: 1.7;
}

/* page top fixed button */
.page-top-btn {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 9999;
    width: 120px;
    display: block;
    transition: transform .2s ease, opacity .2s ease;
}

.page-top-btn:hover {
    transform: translateY(-5px) scale(1.03);
}

.page-top-btn img {
    width: 100%;
    display: block;
}

@media (max-width: 600px) {
    .page-top-btn {
        width: 86px;
        right: 12px;
        bottom: 12px;
    }
}