/* 
MIT License

Copyright (c) 2025 EduSecure

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/

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

/* 基本スタイル */
body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: #0066cc;
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #004080;
}

ul {
    list-style: none;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    background-color: #0066cc;
    color: white;
    border-radius: 4px;
    text-align: center;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #004080;
    color: white;
}

section {
    padding: 60px 0;
}

h2 {
    margin-bottom: 30px;
    text-align: center;
    font-size: 28px;
}

/* ヘッダー */
header {
    background-color: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
}

header h1 {
    font-size: 24px;
}

header h1 a {
    color: #333;
}

/* ナビゲーション */
nav ul {
    display: flex;
}

nav ul li {
    margin-left: 20px;
}

/* ハンバーガーメニュー */
#hamburger {
    display: none;
    width: 30px;
    height: 20px;
    position: relative;
    cursor: pointer;
    z-index: 1001;
}

#hamburger span {
    display: block;
    height: 2px;
    background-color: #333;
    position: absolute;
    width: 100%;
    transition: transform 0.3s, opacity 0.3s;
}

#hamburger span:nth-child(1) {
    top: 0;
}

#hamburger span:nth-child(2) {
    top: 9px;
}

#hamburger span:nth-child(3) {
    bottom: 0;
}

#hamburger.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

#hamburger.active span:nth-child(2) {
    opacity: 0;
}

#hamburger.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

#overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.7);
    z-index: 999;
}

#overlay.active {
    display: block;
}

/* ヒーローセクション */
.hero {
    background-color: #e6f0ff;
    background-image: url("../img/hero.jpg");
    text-align: center;
    padding: 100px 0;
}

.hero h2 {
    font-size: 36px;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* サービス */
.service-items {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.service-items article {
    background-color: white;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 3px 10px rgba(0,0,0,0.1);
}

.service-items h3 {
    margin-bottom: 15px;
    font-size: 20px;
}

/* お問い合わせフォーム */
.contact {
    background-color: white;
}

form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}

input, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

textarea {
    height: 150px;
}

form .btn {
    border: none;
    cursor: pointer;
    width: 100%;
    padding: 12px;
    font-size: 16px;
}

/* フッター */
footer {
    background-color: #333;
    color: white;
    padding: 50px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

footer h2 {
    font-size: 20px;
    margin-bottom: 15px;
    text-align: left;
}

footer p {
    margin-bottom: 8px;
    font-size: 14px;
}

footer a {
    color: #bbb;
}

footer a:hover {
    color: white;
}

footer li {
    margin-bottom: 8px;
}

.copyright {
    text-align: center;
    border-top: 1px solid #555;
    padding-top: 20px;
    font-size: 14px;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    /* ヘッダー */
    header .container {
        padding: 10px 20px;
    }
    
    /* ハンバーガーメニュー表示 */
    #hamburger {
        display: block;
    }
    
    /* ナビゲーション */
    nav {
        position: fixed;
        top: 0;
        right: -300px;
        width: 250px;
        height: 100%;
        background-color: white;
        box-shadow: -2px 0 5px rgba(0,0,0,0.1);
        padding: 80px 20px 20px;
        transition: right 0.3s;
        z-index: 1000;
        overflow-y: auto;
    }
    
    nav.active {
        right: 0;
    }
    
    nav ul {
        flex-direction: column;
    }
    
    nav ul li {
        margin-left: 0;
        margin-bottom: 15px;
    }
    
    /* ヒーローセクション */
    .hero {
        padding: 60px 0;
    }
    
    .hero h2 {
        font-size: 28px;
    }
    
    /* セクション */
    section {
        padding: 40px 0;
    }
    
    /* フッター */
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    h2 {
        font-size: 24px;
    }
    
    .hero h2 {
        font-size: 24px;
    }
    
    .hero p {
        font-size: 16px;
    }
    
    .service-items {
        grid-template-columns: 1fr;
    }
}