:root {
    --bg-color: #faf8f9;
    --text-color: #333333;
    --accent-color: #ff6584;
    --border-color: #f3d6e4;
    --card-bg: rgba(255, 255, 255, 0.85); /* 背景のパーティクルが透けるように調整 */
    --hover-shadow: rgba(255, 101, 132, 0.25);
    --btn-github: #2c3e50;
    --btn-github-hover: #1a252f;
    --btn-portfolio: #8e44ad;
    --btn-portfolio-hover: #732d91;
    --btn-back: #7f8c8d;
    --btn-back-hover: #606b6c;
    --btn-detail: #3498db;
    --btn-detail-hover: #2980b9;
}

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

body {
    font-family: "Nunito", "M PLUS Rounded 1c", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* パーティクルの背景用 */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 60px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
}

h1 {
    color: #2c3e50;
    font-size: 3rem;
    margin-bottom: 10px;
    display: inline-block;
    border-right: 3px solid var(--accent-color);
    padding-right: 5px;
    white-space: nowrap;
    overflow: hidden;
    margin: 0 auto;
}

.subtitle {
    color: #555;
    font-size: 1.2rem;
    margin-top: 15px;
    opacity: 0;
    animation: fadeIn 1s ease forwards 1.5s; /* タイピングエフェクト完了後にフェードイン */
}

.bot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s ease, border-color 0.4s ease;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.card:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 15px 30px var(--hover-shadow);
    border-color: var(--accent-color);
}

.card-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 20px;
    text-align: center;
    transition: transform 0.3s ease;
}

.card:hover .card-icon {
    transform: scale(1.2) rotate(5deg);
}

.card h2 {
    color: var(--accent-color);
    font-size: 1.5rem;
    margin-bottom: 15px;
    text-align: center;
    border-bottom: 2px dashed var(--border-color);
    padding-bottom: 10px;
}

.card p {
    flex-grow: 1;
    margin-bottom: 25px;
    color: #444;
}

.card-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.btn {
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: bold;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-github {
    background-color: var(--btn-github);
    color: white;
}

.btn-github:hover {
    background-color: var(--btn-github-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(44, 62, 80, 0.3);
}

.btn-invite {
    background-color: var(--accent-color);
    color: white;
}

.btn-invite:hover {
    background-color: #e65574;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--hover-shadow);
}

.btn-portfolio {
    background-color: var(--btn-portfolio);
    color: white;
}

.btn-portfolio:hover {
    background-color: var(--btn-portfolio-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(142, 68, 173, 0.3);
}

.btn-back {
    background-color: var(--btn-back);
    color: white;
}

.btn-back:hover {
    background-color: var(--btn-back-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(127, 140, 141, 0.3);
}

.btn-detail {
    background-color: var(--btn-detail);
    color: white;
}

.btn-detail:hover {
    background-color: var(--btn-detail-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(52, 152, 219, 0.3);
}

.bot-detail {
    max-width: 600px;
    margin: 0 auto;
}

footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: #888;
}

/* Animations */
.fade-in {
    opacity: 0;
    animation: fadeIn 1s ease forwards;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* スマホ対応 */
@media (max-width: 600px) {
    h1 {
        font-size: 2.2rem;
    }
    .card-actions {
        flex-direction: column;
    }
    .btn {
        justify-content: center;
    }
}

/* サイドナビゲーション */
.side-nav {
    position: fixed;
    right: 40px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.85);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 20px 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 100;
    display: flex;
    flex-direction: column;
    gap: 12px;
    transition: all 0.3s ease;
}

.side-nav-item {
    text-decoration: none;
    color: var(--text-color);
    padding: 10px 18px;
    border-radius: 12px;
    font-size: 0.9rem;
    font-weight: bold;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
}

.side-nav-item:hover {
    background-color: rgba(255, 101, 132, 0.15);
    color: var(--accent-color);
    transform: translateX(-3px);
}

.side-nav-item.active {
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 5px 15px var(--hover-shadow);
}

.side-nav-item.active:hover {
    color: white;
    transform: none;
}

.side-nav-item.portfolio {
    background-color: var(--btn-portfolio);
    color: white;
    margin-top: 5px;
    border-top: 1px dashed var(--border-color);
    padding-top: 15px;
    border-radius: 0 0 12px 12px;
}

.side-nav-item.portfolio:hover {
    background-color: var(--btn-portfolio-hover);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(142, 68, 173, 0.3);
}

/* 画面幅が狭い場合のレスポンシブ対応 */
@media (max-width: 1200px) {
    .side-nav {
        position: static;
        transform: none;
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        margin: 40px auto 0;
        max-width: 90%;
        top: auto;
        right: auto;
    }
    
    .side-nav-item {
        font-size: 0.85rem;
        padding: 8px 14px;
    }
    
    .side-nav-item.portfolio {
        margin-top: 0;
        border-top: none;
        padding-top: 8px;
        border-radius: 12px;
    }
    
    .side-nav-item:hover {
        transform: translateY(-2px);
    }
}

/* --- index.html用 追加スタイル --- */
h2 {
    color: var(--accent-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
    margin-top: 40px;
}

h3 {
    color: #2c3e50;
    margin-bottom: 10px;
}

.stats-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-radius: 8px;
}

.stats-card:hover {
    transform: scale(1.05) rotate(2deg);
    box-shadow: 0 8px 15px var(--hover-shadow);
}

.badges {
    margin: 15px 0;
}

.badges img {
    margin-right: 8px;
    margin-bottom: 8px;
}

.skills-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 20px;
}

.skill-category {
    flex: 1 1 300px;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 20px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.skill-category:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 20px var(--hover-shadow);
    border-color: var(--accent-color);
}

ul {
    padding-left: 20px;
}

li {
    margin-bottom: 8px;
}

code {
    background-color: rgba(255, 101, 132, 0.1);
    color: #d63384;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
    font-size: 0.9em;
}

.badge-link {
    transition: transform 0.2s ease;
    display: inline-block;
}

.badge-link:hover {
    transform: scale(1.05);
}

.bot-page-btn {
    display: inline-block;
    margin-top: 15px;
    padding: 12px 25px;
    background-color: var(--accent-color);
    color: white;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
    box-shadow: 0 4px 6px rgba(255, 101, 132, 0.3);
}

.bot-page-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(255, 101, 132, 0.4);
    background-color: #ff4d71;
}

.highlight-card {
    text-align: center;
    border-color: var(--accent-color);
    background-color: #fff5f8;
    border-width: 2px;
}

.contact-card {
    display: inline-flex;
    align-items: center;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 12px 24px;
    margin-top: 15px;
    text-decoration: none;
    color: var(--text-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px var(--hover-shadow);
    border-color: var(--accent-color);
}

.contact-info {
    display: flex;
    flex-direction: column;
    text-align: left;
    margin-left: 15px;
}

.service-name {
    font-size: 0.85em;
    color: var(--text-color);
    opacity: 0.7;
    font-weight: bold;
}

.account-id {
    font-size: 1.1em;
    font-weight: bold;
    color: var(--accent-color);
}