/* ============================
   リセット・基本設定
   ============================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', sans-serif;
    background-color: #f4f4f4;
    color: #333;
    line-height: 1.6;
}

a {
    color: #4a90e2;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ============================
   ヘッダー
   ============================ */
header {
    background-color: #1a1a2e;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
    position: sticky;        /* スクロールしても上に固定 */
    top: 0;
    z-index: 100;
}

header h1 a {
    color: #fff;
    font-size: 22px;
    text-decoration: none;
}

header nav {
    display: flex;
    gap: 20px;
}

header nav a {
    color: #ccc;
    font-size: 14px;
    text-decoration: none;
}

header nav a:hover {
    color: #fff;
}

/* ============================
   メインコンテンツ共通
   ============================ */
main,
body > h1,
body > h2,
body > p,
body > form,
body > div,
body > ul,
body > a {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

/* ============================
   エラーメッセージ
   ============================ */
.errors {
    background-color: #ffe0e0;
    border-left: 4px solid #e74c3c;
    padding: 15px 20px;
    border-radius: 4px;
    list-style: none;
    margin-bottom: 20px;
}

.errors li {
    color: #c0392b;
    margin-bottom: 5px;
}

/* ============================
   成功メッセージ
   ============================ */
.success {
    background-color: #e0f7e9;
    border-left: 4px solid #2ecc71;
    padding: 15px 20px;
    border-radius: 4px;
    color: #27ae60;
    margin-bottom: 20px;
}

/* ============================
   フォーム共通
   ============================ */
form {
    background-color: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    margin: 30px auto;
}

form label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
    margin-top: 15px;
    font-size: 14px;
    color: #555;
}

form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="file"],
form textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 15px;
    background-color: #fafafa;
    transition: border-color 0.2s;
}

form input:focus,
form textarea:focus {
    outline: none;
    border-color: #4a90e2;
    background-color: #fff;
}

form textarea {
    height: 100px;
    resize: vertical;        /* 縦方向だけリサイズ可能 */
}

form button[type="submit"] {
    display: block;
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    background-color: #4a90e2;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

form button[type="submit"]:hover {
    background-color: #357abd;
}

/* ============================
   タグ一覧
   ============================ */
.tag-list {
    display: flex;
    flex-wrap: wrap;     /* タグが多くても折り返す */
    gap: 8px;
    padding: 15px 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.tag {
    display: inline-block;
    background-color: #e8f0fe;
    color: #4a90e2;
    padding: 4px 12px;
    border-radius: 20px;     /* 丸みのあるタグっぽいデザイン */
    font-size: 13px;
    text-decoration: none;
    transition: background-color 0.2s;
}

.tag:hover {
    background-color: #4a90e2;
    color: #fff;
    text-decoration: none;
}

/* ============================
   GIF一覧グリッド
   ============================ */
.gif-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
    max-width: 1100px;
    margin: 0 auto;
}

/* ============================
   GIFカード
   ============================ */
.gif-card {
    background-color: #fff;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, box-shadow 0.2s;
}

.gif-card:hover {
    transform: translateY(-4px);    /* ホバーで少し浮き上がる */
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
}

.gif-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;      /* はみ出た部分はトリミング */
    display: block;
}

.gif-title {
    padding: 10px 12px 4px;
    font-size: 15px;
    font-weight: bold;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;    /* タイトルが長い時は...で省略 */
}

.gif-meta {
    padding: 4px 12px 12px;
    font-size: 12px;
    color: #888;
}

/* ============================
   GIF詳細ページ
   ============================ */
.gif-detail {
    background-color: #fff;
    border-radius: 8px;
    padding: 30px;
    max-width: 800px;
    margin: 30px auto;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.gif-detail img {
    width: 100%;
    border-radius: 4px;
    margin-bottom: 20px;
}

.gif-detail h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

.gif-description {
    margin: 15px 0;
    color: #555;
    line-height: 1.8;
}

/* ============================
   いいねボタン
   ============================ */
.like-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    background-color: #fff;
    color: #888;
    border: 2px solid #ddd;
    border-radius: 30px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.2s;
    margin: 15px 0;
}

.like-btn:hover {
    border-color: #e74c3c;
    color: #e74c3c;
}

/* いいね済みの状態 */
.like-btn.liked {
    background-color: #e74c3c;
    border-color: #e74c3c;
    color: #fff;
}

/* ============================
   削除ボタン
   ============================ */
.delete-btn {
    display: inline-block;
    padding: 6px 14px;
    background-color: #fff;
    color: #e74c3c;
    border: 1px solid #e74c3c;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.2s;
    margin: 8px 12px;
}

.delete-btn:hover {
    background-color: #e74c3c;
    color: #fff;
}

/* ============================
   レスポンシブ（スマホ対応）
   ============================ */
@media (max-width: 600px) {

    header {
        flex-direction: column;
        height: auto;
        padding: 12px 20px;
        gap: 8px;
    }

    .gif-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 12px;
        padding: 12px;
    }

    .gif-card img {
        height: 150px;
    }

    .gif-detail {
        padding: 20px 15px;
        margin: 15px;
    }

    form {
        margin: 15px;
        padding: 20px;
    }
}