/* グローバル変数 */
:root {
    --primary-color: #007acc;
    --secondary-color: #005fa3;
    --bg-color: #f4f4f9;
    --text-color: #333;
    --card-bg: white;
    --animation-duration: 0.3s;
}

/* ダークモードの変数 */
[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #ffffff;
    --card-bg: #2d2d2d;
}

/* アニメーションキーフレーム */
@keyframes fadeIn {
    from { 
        opacity: 0; 
        transform: translateY(20px); 
    }
    to { 
        opacity: 1; 
        transform: translateY(0); 
    }
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
}

/* ベーススタイル */
body {
    font-family: 'Roboto', sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: all var(--animation-duration) ease;
}

/* ヘッダースタイル */
header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 40px 20px;
    text-align: center;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

header img {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid white;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease;
}

header img:hover {
    transform: scale(1.05);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, rgba(255,255,255,0.1) 25%, transparent 25%);
    background-size: 3em 3em;
    animation: float 6s ease-in-out infinite;
}

/* カードスタイル */
.card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    margin: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform var(--animation-duration) ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* スキルセクションのスタイルを更新 */
.skill-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 30px;
    padding: 20px;
}

.skill-item {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
}

.skill-circle {
    fill: none;
    stroke-width: 8;
    stroke-linecap: round;
    transform: rotate(-90deg);
    transform-origin: 50% 50%;
    stroke-dasharray: 283;
    stroke-dashoffset: calc(283 - (283 * var(--value)) / 100);
    transition: stroke-dashoffset 1s ease-in-out;
}

.skill-item text {
    font-size: 14px;
    font-weight: bold;
    fill: var(--text-color);
}

/* アニメーション */
@keyframes skillFill {
    from {
        stroke-dashoffset: 283;
    }
    to {
        stroke-dashoffset: calc(283 - (283 * var(--value)) / 100);
    }
}

.skill-circle {
    animation: skillFill 1.5s ease-out forwards;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .skill-container {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
        gap: 20px;
    }
}

/* ダークモードトグルボタンのスタイル */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--card-bg);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    z-index: 1000;
    overflow: hidden;
}

.theme-toggle::before {
    content: '🌞';
    position: absolute;
    transition: all 0.3s ease;
}

[data-theme="dark"] .theme-toggle::before {
    content: '🌙';
    transform: rotate(360deg);
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.theme-toggle::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(255,255,255,0.8) 0%, rgba(255,255,255,0) 70%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.theme-toggle:hover::after {
    opacity: 0.5;
}

/* アニメーション用のキーフレーム追加 */
@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Hobby Cards Styling を更新 */
.hobby-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 20px;
    padding: 20px;
}

.hobby-card {
    position: relative;
    background: var(--card-bg);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.hobby-icon {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.hobby-card h3 {
    margin: 10px 0 5px 0;
    color: var(--text-color);
    font-size: 1.1em;
}

/* Links Styling */
.links-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    padding: 20px;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 15px 25px;
    border-radius: 12px;
    color: white;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.link-icon {
    width: 24px;
    height: 24px;
}

.icon-svg {
    width: 100%;
    height: 100%;
}

.link-text {
    font-weight: 500;
    font-size: 1.1em;
}

/* Link Card Variants */
.github {
    background: #24292e;
}

.note {
    background: #43b880;
}

.mail {
    background: #007acc;
}

.link-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* アニメーション */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
    100% { transform: translateY(0px); }
}

.hobby-card {
    animation: float 6s ease-in-out infinite;
    animation-delay: calc(var(--animation-order) * 0.1s);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .hobby-grid {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: 15px;
    }
    
    .hobby-card {
        padding: 15px;
    }
    
    .hobby-icon {
        font-size: 2em;
    }
    
    .hobby-card h3 {
        font-size: 1em;
    }
    
    .travel-detail {
        font-size: 0.8em;
    }
    
    .links-container {
        flex-direction: column;
        align-items: stretch;
    }
    
    .link-card {
        justify-content: center;
    }
}

.skill-tree {
    position: relative;
    padding: 20px;
}

.skill-branch {
    display: flex;
    justify-content: space-between;
    margin: 20px 0;
}

.skill-node {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 10px;
    position: relative;
    transition: all 0.3s ease;
}

.skill-node::before {
    content: '';
    position: absolute;
    width: 2px;
    background: var(--primary-color);
    height: 20px;
    top: -20px;
    left: 50%;
}

.skill-node:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

/* Travel Cards Styling を更新 */
.travel-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 10px;
}

.travel-card {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.travel-icon {
    font-size: 2.5em;
    margin-right: 20px;
    padding: 15px;
    background: rgba(0, 122, 204, 0.1);
    border-radius: 12px;
    min-width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.travel-content {
    flex: 1;
}

.travel-content h3 {
    margin: 0 0 5px 0;
    color: var(--text-color);
    font-size: 1.2em;
}

.travel-detail {
    font-size: 0.9em;
    color: var(--text-color);
    opacity: 0.8;
    margin: 0;
}

/* レスポンシブ対応を更新 */
@media (max-width: 768px) {
    .travel-card {
        padding: 15px;
    }

    .travel-icon {
        font-size: 2em;
        padding: 10px;
        margin-right: 15px;
        min-width: 30px;
        height: 30px;
    }

    .travel-content h3 {
        font-size: 1.1em;
    }

    .travel-detail {
        font-size: 0.8em;
    }
}

/* レスポンシブデザインの追加 */
@media (max-width: 480px) {
    header img {
        width: 120px;
        height: 120px;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
}

/* タイムラインのスタイル追加 */
.timeline {
    list-style-type: none;
    padding-left: 20px;
}

.timeline li {
    position: relative;
    padding-bottom: 15px;
    padding-left: 25px;
    border-left: 2px solid var(--primary-color);
}

.timeline li:last-child {
    border-left: 2px solid transparent;
}

.timeline li::before {
    content: '';
    width: 15px;
    height: 15px;
    background: var(--primary-color);
    border-radius: 50%;
    position: absolute;
    left: -8px;
    top: 5px;
}

main section {
    padding: 20px;
    margin: 20px 0;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}