/* リセットとベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ライトモード */
    --bg-color: #f5f5f5;
    --text-color: #1a1a1a;
    --header-bg: #ffffff;
    --footer-bg: #f5f5f5;
    --footer-text: #666666;
    --border-color: #e0e0e0;
    --hover-color: #f0f0f0;
    --frame-color: #d4a574;
    --frame-shadow: rgba(0, 0, 0, 0.15);
    --mat-color: #ffffff;
    --caption-bg: #ffffff;
    --caption-text: #1a1a1a;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    /* ダークモード */
    --bg-color: #0d0d0d;
    --text-color: #e0e0e0;
    --header-bg: #000000;
    --footer-bg: #0d0d0d;
    --footer-text: #999999;
    --border-color: #333333;
    --hover-color: #1a1a1a;
    --frame-color: #8b6f47;
    --frame-shadow: rgba(0, 0, 0, 0.5);
    --mat-color: #4a4a4a;
    --caption-bg: #2a2a2a;
    --caption-text: #ffffff;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: "Shippori Mincho", -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: var(--transition);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ヘッダー */
.header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 2rem;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    transition: transform 0.3s ease;
    transform: translateY(0);
}

.header.hidden {
    transform: translateY(-100%);
}

.header-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--text-color);
    transition: var(--transition);
}

.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.4s ease, border-color 0.4s ease;
    background-color: transparent;
    position: relative;
    overflow: visible;
}


.theme-toggle:hover {
    background-color: var(--hover-color);
    transform: scale(1.05);
}

.theme-toggle:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

.theme-toggle:focus:not(:focus-visible) {
    outline: none;
}

.theme-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--text-color);
    transition: background-color 0.4s ease, transform 0.3s ease-out;
    position: relative;
    overflow: visible;
    transform: translate(var(--eye-x, 0), var(--eye-y, 0));
    will-change: transform;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    line-height: 1;
}

/* 10回回ったら🌀に置き換え */
.theme-toggle.spin-complete .theme-icon {
    background-color: transparent;
}

/* ライトモードで10回回ったら🌀に置き換え（::afterを使用） */
.theme-toggle.spin-complete .theme-icon::after {
    content: '🌀';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: emojiSpin 2s linear infinite;
}

/* ダークモードでは::afterを確実に非表示 */
[data-theme="dark"] .theme-toggle.spin-complete .theme-icon::after {
    content: '' !important;
    animation: none !important;
}

/* 絵文字の回転アニメーション（カーソル追従と組み合わせ） */
@keyframes emojiSpin {
    from {
        transform: translate(-50%, -50%) translate(var(--eye-x, 0), var(--eye-y, 0)) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) translate(var(--eye-x, 0), var(--eye-y, 0)) rotate(-360deg);
    }
}

.theme-icon::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background-color: var(--bg-color);
    transform: translate(-50%, -50%);
    transition: width 0.4s ease, height 0.4s ease;
}

/* ライトモード：クリック時のアニメーション */
.theme-toggle:active {
    background-color: var(--text-color);
    border-color: var(--text-color);
}

.theme-toggle:active .theme-icon::before {
    width: 24px;
    height: 24px;
}

/* ダークモード */
[data-theme="dark"] .theme-icon {
    background-color: transparent;
    transform: translate(0, 0);
}

[data-theme="dark"] .theme-icon::before {
    width: 24px;
    height: 24px;
    background-color: #ffffff;
    transform: translate(-50%, -50%) translate(var(--eye-x, 0), var(--eye-y, 0));
    transition: width 0.4s ease, height 0.4s ease, transform 0.3s ease-out;
    will-change: transform;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    line-height: 1;
}

/* ダークモードで10回回ったら🌀に置き換え（::beforeを使用） */
[data-theme="dark"] .theme-toggle.spin-complete .theme-icon::before {
    background-color: transparent !important;
    width: 24px !important;
    height: 24px !important;
    content: '🌀' !important;
    animation: emojiSpinDark 2s linear infinite !important;
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-size: 24px !important;
    line-height: 1 !important;
}

/* ライトモードでは::beforeを確実に通常の状態に戻す（ダークモードの後に配置して優先度を確保） */
html:not([data-theme="dark"]) .theme-toggle.spin-complete .theme-icon::before {
    width: 0 !important;
    height: 0 !important;
    content: '' !important;
    animation: none !important;
    background-color: var(--bg-color) !important;
    display: block !important;
}

/* ダークモード用の絵文字回転アニメーション */
@keyframes emojiSpinDark {
    from {
        transform: translate(-50%, -50%) translate(var(--eye-x, 0), var(--eye-y, 0)) rotate(0deg);
    }
    to {
        transform: translate(-50%, -50%) translate(var(--eye-x, 0), var(--eye-y, 0)) rotate(-360deg);
    }
}

/* メインコンテンツ */
.main {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    width: 100%;
    margin-top: 0;
    padding-top: calc(3rem + 80px);
}

@media (max-width: 768px) {
    .main {
        padding: 2rem 1rem;
        padding-top: calc(2rem + 70px);
    }
}

@media (max-width: 480px) {
    .main {
        padding: 1.5rem 0.75rem;
        padding-top: calc(1.5rem + 60px);
    }
}

/* ギャラリー */
.gallery {
    margin-top: 0;
}

.gallery-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 4rem;
    justify-items: center;
}

/* 作品カード */
.artwork-card {
    width: 100%;
    max-width: calc(100vw - 2rem);
    display: flex;
    justify-content: center;
}

@media (min-width: 900px) {
    .artwork-card {
        max-width: 66.67vh;
    }
}

.artwork-link {
    text-decoration: none;
    color: inherit;
    display: contents;
    transition: var(--transition);
}

.artwork-frame:focus,
.artwork-caption:focus {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

.artwork-wrapper {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0;
    width: fit-content;
    pointer-events: none;
    perspective: 1000px;
    transform-style: preserve-3d;
}

@media (min-width: 900px) {
    .artwork-wrapper {
        flex-direction: row;
        align-items: flex-end;
    }
}

/* キャンバス風のフレーム */
.artwork-frame {
    background: linear-gradient(135deg, var(--frame-color) 0%, #c9a068 50%, var(--frame-color) 100%);
    padding: 6px;
    border-radius: 0;
    box-shadow: 
        0 20px 40px var(--frame-shadow),
        0 10px 20px var(--frame-shadow),
        inset 0 2px 4px rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2);
    position: relative;
    transition: transform 0.1s ease-out;
    cursor: pointer;
    pointer-events: auto;
    width: 100%;
    aspect-ratio: 1 / 1;
    transform-style: preserve-3d;
}

/* ホバー解除時のゆっくりしたアニメーション */
.artwork-frame.returning {
    transition: transform 0.6s ease-out;
}

/* 白い正方形（画像より少し大きい） */
.artwork-frame::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 6px;
    right: 6px;
    bottom: 6px;
    background-color: var(--mat-color);
    z-index: 0;
}

.artwork-frame:hover {
    box-shadow: 
        0 25px 50px var(--frame-shadow),
        0 15px 30px var(--frame-shadow),
        inset 0 2px 4px rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2);
}

.artwork-wrapper:has(.artwork-caption:hover) .artwork-frame {
    box-shadow: 
        0 25px 50px var(--frame-shadow),
        0 15px 30px var(--frame-shadow),
        inset 0 2px 4px rgba(255, 255, 255, 0.3),
        inset 0 -2px 4px rgba(0, 0, 0, 0.2);
    animation: artworkFloat 4s ease-in-out infinite;
}

/* キャプションホバー時の3Dアニメーション */
@keyframes artworkFloat {
    0% {
        transform: rotateX(-2deg) rotateY(-2deg) scale3d(1.02, 1.02, 1.02);
    }
    25% {
        transform: rotateX(-2deg) rotateY(2deg) scale3d(1.02, 1.02, 1.02);
    }
    50% {
        transform: rotateX(2deg) rotateY(2deg) scale3d(1.02, 1.02, 1.02);
    }
    75% {
        transform: rotateX(2deg) rotateY(-2deg) scale3d(1.02, 1.02, 1.02);
    }
    100% {
        transform: rotateX(-2deg) rotateY(-2deg) scale3d(1.02, 1.02, 1.02);
    }
}

/* シャイン効果 */
.artwork-frame::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(
        circle at var(--shine-x, 50%) var(--shine-y, 50%),
        rgba(255, 255, 255, 0.8) 0%,
        rgba(255, 255, 255, 0.3) 20%,
        transparent 60%
    );
    opacity: 0;
    transition: opacity 0.6s ease-out;
    pointer-events: none;
    z-index: 10;
    mix-blend-mode: overlay;
}

.artwork-frame:hover::after {
    opacity: 1;
}

.artwork-wrapper:has(.artwork-caption:hover) .artwork-frame::after {
    opacity: 1;
    background: radial-gradient(
        circle at var(--caption-shine-x, 50%) var(--caption-shine-y, 50%),
        rgba(255, 255, 255, 0.8) 0%,
        rgba(255, 255, 255, 0.3) 20%,
        transparent 60%
    );
}


/* ホログラム効果 */
.artwork-mat::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg,
        rgba(255, 0, 255, 0.1) 0%,
        rgba(0, 255, 255, 0.1) 25%,
        rgba(255, 255, 0, 0.1) 50%,
        rgba(0, 255, 0, 0.1) 75%,
        rgba(255, 0, 0, 0.1) 100%
    );
    opacity: 0;
    transition: opacity 0.3s;
    pointer-events: none;
    z-index: 3;
}

.artwork-wrapper:has(.artwork-frame:hover) .artwork-mat::before,
.artwork-wrapper:has(.artwork-caption:hover) .artwork-mat::before {
    opacity: 0.4;
}

/* マット（額縁の内側） */
.artwork-mat {
    background-color: transparent;
    padding: 12px;
    border-radius: 0;
    transition: var(--transition);
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    z-index: 1;
}

/* 作品画像 */
.artwork-image {
    width: 100%;
    height: 100%;
    min-height: 0;
    object-fit: contain;
    display: block;
    border-radius: 0;
    transition: var(--transition);
    background-color: transparent;
    position: relative;
    z-index: 2;
    max-width: 100%;
    max-height: 100%;
}

/* 画像が読み込めない場合の代替表示 */
.artwork-image[src=""],
.artwork-image:not([src]) {
    background-color: var(--bg-color);
    opacity: 0.3;
}

.artwork-image[src=""]::after,
.artwork-image:not([src])::after {
    content: attr(alt);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: 0.875rem;
    color: var(--text-color);
    opacity: 0.7;
}

/* 作品キャプション（美術館風） */
.artwork-caption {
    background-color: var(--caption-bg);
    border: none;
    padding: 1rem 1.25rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    position: static;
    margin-top: 1rem;
    min-width: 200px;
    max-width: 300px;
    transition: var(--transition);
    align-self: flex-end;
    cursor: pointer;
    pointer-events: auto;
}

@media (min-width: 900px) {
    .artwork-caption {
        margin-top: 0;
        margin-left: 1rem;
        margin-bottom: 6px;
    }
}

.artwork-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--caption-text);
    transition: var(--transition);
}

.artwork-description {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--caption-text);
    margin: 0;
    transition: var(--transition);
}

/* フッター */
.footer {
    background-color: var(--footer-bg);
    border-top: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    margin-top: 4rem;
    transition: var(--transition);
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.footer-text {
    color: var(--footer-text);
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-nav {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-link {
    color: var(--footer-text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
    position: relative;
}

.footer-link:hover {
    color: var(--text-color);
}

.footer-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--text-color);
    transition: width 0.3s ease;
}

.footer-link:hover::after {
    width: 100%;
}

/* レスポンシブデザイン */
@media (min-width: 900px) {
    /* 横長レイアウト：キャプションを横に配置 */
    .artwork-wrapper {
        flex-direction: row;
        align-items: flex-end;
        gap: 0;
    }

    .artwork-caption {
        position: static;
        margin-left: 1rem;
        margin-bottom: 6px;
        transform: translateX(0);
    }
}

@media (max-width: 768px) {
    .header {
        padding: 1rem 1.5rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .theme-toggle {
        width: 44px;
        height: 44px;
    }

    .theme-icon {
        width: 20px;
        height: 20px;
    }

    [data-theme="dark"] .theme-icon::before {
        width: 20px;
        height: 20px;
    }


    .gallery-grid {
        gap: 3rem;
    }

    .artwork-frame {
        padding: 5px;
    }

    .artwork-frame::before {
        top: 3px;
        left: 3px;
        right: 3px;
        bottom: 3px;
    }

    .artwork-mat {
        padding: 10px;
    }

    .artwork-caption {
        margin-top: 1rem;
        min-width: 180px;
        max-width: 250px;
        padding: 0.875rem 1rem;
    }

    .footer {
        padding: 2rem 1.5rem;
    }

    .footer-nav {
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .header {
        padding: 0.75rem 1rem;
    }

    .logo h1 {
        font-size: 1.25rem;
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
    }

    .theme-icon {
        width: 18px;
        height: 18px;
    }

    [data-theme="dark"] .theme-icon::before {
        width: 18px;
        height: 18px;
    }


    .gallery-grid {
        gap: 2.5rem;
    }

    .artwork-frame {
        padding: 4px;
    }

    .artwork-frame::before {
        top: 2px;
        left: 2px;
        right: 2px;
        bottom: 2px;
    }

    .artwork-mat {
        padding: 8px;
    }

    .artwork-caption {
        margin-top: 0.875rem;
        min-width: 160px;
        max-width: 220px;
        padding: 0.75rem 0.875rem;
    }

    .artwork-title {
        font-size: 0.9375rem;
    }

    .artwork-description {
        font-size: 0.8125rem;
    }
}

/* ユニバーサルデザイン - アクセシビリティ */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* フォーカス表示の改善 */
*:focus-visible {
    outline: 2px solid var(--text-color);
    outline-offset: 2px;
}

/* ページコンテンツ（About/Contact） */
.page-content {
    max-width: 600px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

.page-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 600;
    margin-bottom: 3rem;
    color: var(--text-color);
    transition: var(--transition);
    text-align: center;
}

.content-section {
    margin-bottom: 3rem;
}

.content-heading {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-color);
    transition: var(--transition);
}

.content-text {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--text-color);
    transition: var(--transition);
    margin-bottom: 1rem;
}

.contact-info {
    margin-top: 1rem;
}

/* お問い合わせフォーム */
.contact-form {
    margin-top: 2rem;
    max-width: 600px;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    transition: var(--transition);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    font-family: "Shippori Mincho", serif;
    border: 1px solid var(--border-color);
    border-radius: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: var(--transition);
    resize: vertical;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--text-color);
}

.form-textarea {
    min-height: 150px;
}

.form-submit {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-family: "Shippori Mincho", serif;
    font-weight: 500;
    color: var(--bg-color);
    background-color: var(--text-color);
    border: none;
    border-radius: 0;
    cursor: pointer;
    transition: var(--transition);
}

.form-submit:hover {
    opacity: 0.8;
    transform: translateY(-1px);
}

.form-submit:active {
    transform: translateY(0);
}

.contact-form-link {
    margin-top: 2rem;
    text-align: center;
}

.form-submit-link {
    display: inline-block;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-family: "Shippori Mincho", serif;
    font-weight: 500;
    color: var(--bg-color);
    background-color: var(--text-color);
    border: none;
    border-radius: 0;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
}

.form-submit-link:hover {
    opacity: 0.8;
    transform: translateY(-1px);
}

.form-submit-link:active {
    transform: translateY(0);
}

/* レスポンシブ：ページコンテンツ */
@media (max-width: 768px) {
    .page-content {
        padding: 1.5rem 1rem;
    }

    .content-section {
        margin-bottom: 2rem;
    }

    .content-heading {
        font-size: 1.25rem;
    }

    .content-text {
        font-size: 0.9375rem;
    }
}

@media (max-width: 480px) {
    .page-content {
        padding: 1rem 0.75rem;
    }

    .page-title {
        margin-bottom: 2rem;
    }

    .content-section {
        margin-bottom: 1.5rem;
    }
}

/* 作品詳細ページ */
.artwork-detail {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 0;
}

.artwork-detail-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: start;
}

@media (min-width: 900px) {
    .artwork-detail-container {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
}

.artwork-detail-image {
    width: 100%;
    max-width: 100%;
}

.artwork-detail-image .artwork-frame {
    width: 100%;
    max-width: 100%;
}

.artwork-detail-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.artwork-detail-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    color: var(--text-color);
    transition: var(--transition);
    margin-bottom: 0.5rem;
}

.artwork-detail-description {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--text-color);
    transition: var(--transition);
}

.artwork-detail-meta {
    margin-top: 1rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.artwork-detail-meta p {
    font-size: 0.9375rem;
    color: var(--text-color);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.artwork-nav {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.artwork-nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
    display: inline-block;
}

.artwork-nav-link:hover {
    opacity: 0.7;
}

.artwork-detail-links {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.artwork-external-link {
    color: var(--text-color);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
    display: inline-block;
}

.artwork-external-link:hover {
    opacity: 0.7;
}

/* 高コントラストモード対応 */
@media (prefers-contrast: high) {
    :root {
        --border-color: #000000;
    }

    [data-theme="dark"] {
        --border-color: #ffffff;
    }
}