@charset "UTF-8";

/* =========================================
   変数定義（完全版）
   ========================================= */
:root {
    /* メインカラー（青系） */
    --primary-color: #5b8fd8;
    --primary-dark: #4a7fc0;
    --primary-light: #e0e8ff;
    --primary-lighter: #f0f4ff;
    
    /* セカンダリカラー（紫系） */
    --secondary-color: #8b7fd8;
    --secondary-dark: #6b5fc0;
    
    /* ユーザーカラー（緑系） */
    --user-color: #34d058;
    --user-dark: #28a745;
    --user-bg-bubble: #cff7d6;
    --user-lighter: #e6f9ec;
    
    /* 警告・削除カラー（赤系） */
    --danger-color: #e74c3c;
    --danger-dark: #c0392b;
    --danger-light: #ffe5e5;
    
    /* 成功カラー */
    --success-color: #10b981;
    --success-dark: #059669;
    
    /* 警告カラー */
    --warning-color: #f59e0b;
    --warning-dark: #d97706;
    
    /* 背景・テキスト */
    --bg-body: #f8f9fa;
    --bg-container: #ffffff;
    --bg-overlay: rgba(255, 255, 255, 0.8);
    --text-main: #1a202c;
    --text-sub: #718096;
    --text-muted: #a0aec0;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    
    /* 影 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* フォント */
    --font-family: "Hiragino Maru Gothic W4 JIS2004", "游ゴシック体", "Yu Gothic", "Hiragino Sans", sans-serif;
    
    /* トランジション */
    --transition-fast: 0.15s ease-out;
    --transition-base: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
    
    /* ボーダー半径 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* スペーシング */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 20px;
    --spacing-2xl: 24px;
}

/* =========================================
   ダークモード対応
   ========================================= */
[data-theme="dark"] {
    /* 背景色 */
    --bg-body: #0f172a;
    --bg-container: #1e293b;
    --bg-overlay: rgba(30, 41, 59, 0.9);
    
    /* テキスト色 */
    --text-main: #f1f5f9;
    --text-sub: #94a3b8;
    --text-muted: #64748b;
    
    /* ボーダー色 */
    --border-color: #334155;
    --border-light: #475569;
    
    /* メッセージ背景 */
    --user-bg-bubble: #1e4a3a;
    --primary-lighter: #1e3a5f;
    
    /* 影（ダークモード用） */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] .message.left .bubble {
    background: #2d3748;
    border-color: #4a5568;
}

/* ダークモードでの左側吹き出しのしっぽ */
[data-theme="dark"] .message.left .bubble::after {
    border-right-color: #2d3748;
}

[data-theme="dark"] .bubble img {
    filter: brightness(0.9);
}

[data-theme="dark"] .messages-area::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #475569, #334155);
}

[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] textarea {
    background: #2d3748;
    color: var(--text-main);
    border-color: var(--border-color);
}

[data-theme="dark"] input[type="file"] {
    background: #2d3748;
    color: var(--text-main);
}

[data-theme="dark"] .input-label {
    color: var(--text-sub);
}

/* ダークモードでのヘッダー */
[data-theme="dark"] .header {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    border-bottom-color: var(--border-color);
}

[data-theme="dark"] .header p {
    color: var(--text-sub);
}

[data-theme="dark"] .header a.home-link {
    background: rgba(30, 41, 59, 0.95);
    border-color: var(--border-color);
}

[data-theme="dark"] .header a.home-link:hover {
    background: var(--primary-color);
    color: white;
}

[data-theme="dark"] .admin-mode-badge {
    background: rgba(30, 41, 59, 0.95);
    border-color: var(--border-color);
}

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

body {
    font-family: var(--font-family);
    background: linear-gradient(135deg, #f5f7fa 0%, #e8edf3 100%);
    color: var(--text-main);
    min-height: 100vh;
    padding: var(--spacing-xl);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--transition-base), color var(--transition-base);
}

html {
    scroll-behavior: smooth;
}

/* ダークモード時のbody背景 */
[data-theme="dark"] body {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

/* =========================================
   ダークモード切り替えボタン
   ========================================= */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--bg-container);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-full);
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    font-size: 24px;
}

.theme-toggle:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: var(--shadow-xl);
}

.theme-toggle:active {
    transform: scale(0.95);
}

/* =========================================
   スクロールトップボタン
   ========================================= */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition-base);
    z-index: 999;
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scroll-to-top.show {
    opacity: 1;
    transform: scale(1);
}

.scroll-to-top:hover {
    transform: scale(1.1) translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.scroll-to-top:active {
    transform: scale(0.95);
}

/* =========================================
   トースト通知
   ========================================= */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-width: 400px;
}

.toast {
    background: var(--bg-container);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: 12px;
    animation: slideInRight 0.3s ease-out;
    border-left: 4px solid;
    backdrop-filter: blur(10px);
}

.toast.success { 
    border-left-color: var(--success-color);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.05));
}

.toast.error { 
    border-left-color: var(--danger-color);
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1), rgba(192, 57, 43, 0.05));
}

.toast.info { 
    border-left-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(91, 143, 216, 0.1), rgba(74, 127, 192, 0.05));
}

.toast.warning {
    border-left-color: var(--warning-color);
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.1), rgba(217, 119, 6, 0.05));
}

.toast-icon {
    font-size: 24px;
    flex-shrink: 0;
}

.toast-message {
    flex-grow: 1;
    font-size: 14px;
    color: var(--text-main);
}

.toast-close {
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
    font-size: 20px;
    color: var(--text-main);
    background: none;
    border: none;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.toast-close:hover {
    opacity: 1;
}

@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

@keyframes fadeOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

/* =========================================
   画像ライトボックス
   ========================================= */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 10000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s;
    backdrop-filter: blur(10px);
}

.lightbox.show {
    display: flex;
}

.lightbox img {
    max-width: 90%;
    max-height: 90%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-2xl);
    animation: zoomIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    color: white;
    font-size: 40px;
    cursor: pointer;
    background: rgba(0, 0, 0, 0.5);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    border: none;
}

.lightbox-close:hover {
    background: rgba(0, 0, 0, 0.8);
    transform: rotate(90deg);
}

@keyframes zoomIn {
    from {
        transform: scale(0.5);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* =========================================
   絵文字ピッカー
   ========================================= */
.emoji-picker {
    position: relative;
    display: inline-block;
}

.emoji-trigger {
    background: var(--bg-container);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 8px 12px;
    cursor: pointer;
    font-size: 20px;
    transition: all var(--transition-base);
    width: 100%;
    color: var(--text-main);
}

.emoji-trigger:hover {
    border-color: var(--primary-color);
    transform: scale(1.05);
}

.emoji-panel {
    display: none;
    position: absolute;
    bottom: 100%;
    left: 0;
    background: var(--bg-container);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    box-shadow: var(--shadow-xl);
    margin-bottom: 8px;
    width: 320px;
    max-height: 240px;
    overflow-y: auto;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.emoji-panel.show {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 8px;
    animation: fadeIn 0.2s;
}

.emoji {
    font-size: 24px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    text-align: center;
}

.emoji:hover {
    background: var(--primary-light);
    transform: scale(1.3);
}

/* ダークモードでの絵文字ホバー背景 */
[data-theme="dark"] .emoji:hover {
    background: var(--primary-dark);
}

/* =========================================
   文字数カウンター
   ========================================= */
.char-counter {
    font-size: 12px;
    color: var(--text-sub);
    text-align: right;
    margin-top: 4px;
    transition: color var(--transition-base);
    font-weight: 600;
}

.char-counter.warning {
    color: var(--warning-color);
}

.char-counter.danger {
    color: var(--danger-color);
    font-weight: 700;
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

/* =========================================
   レイアウト
   ========================================= */
.container {
    max-width: 800px;
    margin: 0 auto;
    background: var(--bg-container);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-2xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 80vh;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.5);
    transition: all var(--transition-base);
}

/* =========================================
   ヘッダー
   ========================================= */
.header {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    color: var(--text-main);
    padding: var(--spacing-2xl);
    text-align: center;
    position: relative;
    border-bottom: 1px solid var(--border-light);
    backdrop-filter: blur(10px);
    transition: all var(--transition-base);
}

.header h1 {
    font-size: clamp(20px, 4vw, 24px);
    margin-bottom: var(--spacing-sm);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header p {
    font-size: 14px;
    opacity: 0.8;
    color: var(--text-sub);
}

.header a.home-link {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.95);
    color: var(--primary-color);
    text-decoration: none;
    border-radius: var(--radius-full);
    font-size: 13px;
    font-weight: 600;
    border: 2px solid var(--primary-light);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
    vertical-align: middle;
    line-height: normal;
}

.header a.home-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.5), transparent);
    transition: left var(--transition-slow);
}

.header a.home-link:hover::before {
    left: 100%;
}

.header a.home-link:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(91, 143, 216, 0.4);
    border-color: var(--primary-color);
}

.header a.home-link:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

.admin-mode-badge {
    position: absolute;
    top: var(--spacing-xl);
    right: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.95);
    color: var(--text-main);
    padding: 10px 18px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(10px);
    animation: slideInRight 0.4s ease-out;
}

.admin-logout-btn {
    background: linear-gradient(135deg, var(--danger-color), var(--danger-dark));
    border: none;
    color: white;
    padding: 6px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    transition: all var(--transition-base);
    text-decoration: none;
    display: inline-block;
    box-shadow: var(--shadow-sm);
}

.admin-logout-btn:hover {
    transform: translateY(-1px) scale(1.05);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.4);
}

.admin-logout-btn:active {
    transform: translateY(0) scale(1);
}

/* =========================================
   メッセージエリア
   ========================================= */
.messages-area {
    height: 800px;
    overflow-y: auto;
    padding: var(--spacing-2xl);
    background: linear-gradient(180deg, #f8fafc 0%, #f0f4f8 100%);
    scrollbar-width: thin;
    scrollbar-color: #cbd5e0 transparent;
    transition: background var(--transition-base);
}

[data-theme="dark"] .messages-area {
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

.messages-area::-webkit-scrollbar {
    width: 8px;
}

.messages-area::-webkit-scrollbar-track {
    background: transparent;
}

.messages-area::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, #cbd5e0, #a0aec0);
    border-radius: var(--radius-full);
    transition: background var(--transition-base);
}

.messages-area::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(180deg, var(--primary-color), var(--primary-dark));
}

.message {
    width: 100%;
    margin: var(--spacing-lg) 0;
    overflow: visible;
    animation: fadeInUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    display: flex;
    align-items: flex-start;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-content {
    display: flex;
    flex-direction: column;
    max-width: 70%;
}

.message.left { justify-content: flex-start; }
.message.right { justify-content: flex-end; }

.message.right .message-icon {
    order: 2;
    margin-left: 10px;
    background: linear-gradient(135deg, var(--user-color), var(--user-dark));
}

.message.right .message-content {
    order: 1;
    align-items: flex-end;
    margin-right: 0;
}

.message.left .message-icon {
    margin-right: 10px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
}

.message-icon {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    color: white;
    text-align: center;
    line-height: 45px;
    font-weight: 700;
    font-size: 18px;
    flex-shrink: 0;
    box-shadow: var(--shadow-md);
    position: relative;
    transition: transform var(--transition-base);
}

.message-icon::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    background: inherit;
    filter: blur(8px);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: -1;
}

.message:hover .message-icon::after {
    opacity: 0.6;
}

.message:hover .message-icon {
    transform: scale(1.05);
}

.message-header {
    font-size: 12px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-sub);
    font-weight: 500;
}

.message.right .message-header {
    justify-content: flex-end;
    flex-direction: row-reverse;
}

.bubble {
    display: inline-block;
    position: relative;
    padding: 14px 18px;
    border-radius: 18px;
    word-wrap: break-word;
    box-shadow: var(--shadow-md);
    line-height: 1.6;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
}

.message:hover .bubble {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.bubble img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    display: block;
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.bubble img:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-light);
}

.bubble a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: all var(--transition-fast);
}

.bubble a:hover {
    border-bottom-color: var(--primary-color);
}

.message.left .bubble {
    background: white;
    color: var(--text-main);
    border: 1px solid var(--border-light);
}

.message.left .bubble::after {
    content: "";
    display: inline-block;
    position: absolute;
    top: 8px;
    left: -19px;
    border: 10px solid transparent;
    border-right: 20px solid white;
    transform: rotate(35deg);
    filter: drop-shadow(-2px 2px 2px rgba(0, 0, 0, 0.05));
}

.message.right .bubble {
    background: var(--user-bg-bubble);
    color: var(--text-main);
    border: 1px solid rgba(52, 208, 88, 0.1);
}

.message.right .bubble::after {
    content: "";
    display: inline-block;
    position: absolute;
    top: 8px;
    right: -19px;
    border: 10px solid transparent;
    border-left: 20px solid var(--user-bg-bubble);
    transform: rotate(-35deg);
    filter: drop-shadow(2px 2px 2px rgba(0, 0, 0, 0.05));
}

.message-time {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    font-weight: 500;
}

.message.left .message-time { text-align: left; }
.message.right .message-time { text-align: right; }

.delete-btn, .admin-delete-btn {
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 600;
}

.delete-btn {
    font-size: 11px;
    color: var(--text-sub);
    text-decoration: none;
    margin-left: var(--spacing-sm);
    opacity: 0.6;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    background: transparent;
}

.delete-btn:hover {
    opacity: 1;
    color: var(--danger-color);
    background: var(--danger-light);
}

/* 右側メッセージの削除ボタンの間隔を広げる */
.message.right .delete-btn {
    margin-left: 0;
    margin-right: 24px;
}

.admin-delete-btn {
    font-size: 11px;
    background: linear-gradient(135deg, var(--danger-color), var(--danger-dark));
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    margin-left: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
}

/* 右側メッセージの管理削除ボタンの間隔を広げる */
.message.right .admin-delete-btn {
    margin-left: 0;
    margin-right: 24px;
}

.admin-delete-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.3);
}

.admin-delete-btn:active {
    transform: translateY(0);
}

/* =========================================
   フォームエリア
   ========================================= */
.input-area {
    padding: var(--spacing-2xl);
    background: linear-gradient(180deg, white 0%, #fafbfc 100%);
    border-top: 1px solid var(--border-light);
    margin-top: auto;
    transition: background var(--transition-base);
}

[data-theme="dark"] .input-area {
    background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
}

.info-box {
    background: linear-gradient(135deg, var(--primary-lighter), var(--primary-light));
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--text-main);
    border-left: 4px solid var(--primary-color);
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

.admin-info-box {
    background: linear-gradient(135deg, #fff8e1, #fff3cd);
    color: #856404;
    border-left-color: #ffc107;
}

.error-message {
    background: linear-gradient(135deg, #fff5f5, #ffe5e5);
    color: var(--danger-dark);
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) var(--spacing-xl);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--danger-color);
    font-size: 14px;
    font-weight: 500;
    box-shadow: var(--shadow-sm);
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-8px); }
    75% { transform: translateX(8px); }
}

.input-group {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.input-label {
    font-size: 12px;
    color: var(--text-sub);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 600;
}

.required {
    color: var(--danger-color);
    font-weight: 700;
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    transition: all var(--transition-base);
    background: white;
    color: var(--text-main);
}

input[type="text"]:hover,
input[type="password"]:hover,
textarea:hover {
    border-color: var(--primary-light);
}

input[type="text"]:focus,
input[type="password"]:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(91, 143, 216, 0.1);
    transform: translateY(-1px);
}

input[type="text"]:focus-visible,
input[type="password"]:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-base);
    background: white;
}

input[type="file"]:hover {
    border-color: var(--primary-color);
    background: var(--primary-lighter);
}

input[type="file"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(91, 143, 216, 0.1);
}

textarea {
    field-sizing: content;
    resize: vertical;
    min-height: 6rem;
}

.button-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

button {
    padding: 14px 28px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: 600;
    width: 100%;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

button::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

button:active::before {
    width: 300px;
    height: 300px;
}

.btn-admin-post {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
}

.btn-admin-post:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(91, 143, 216, 0.4);
}

.btn-admin-post:active {
    transform: translateY(0);
}

.btn-user-post {
    background: linear-gradient(135deg, var(--user-color), var(--user-dark));
    color: white;
}

.btn-user-post:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(52, 208, 88, 0.4);
}

.btn-user-post:active {
    transform: translateY(0);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* =========================================
   ページネーション
   ========================================= */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-2xl);
    background: white;
    border-top: 1px solid var(--border-light);
    flex-wrap: wrap;
    transition: background var(--transition-base);
}

[data-theme="dark"] .pagination {
    background: var(--bg-container);
}

.pagination a, .pagination span {
    padding: 10px 14px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    text-decoration: none;
    color: var(--primary-color);
    font-size: 14px;
    font-weight: 600;
    transition: all var(--transition-base);
    min-width: 44px;
    text-align: center;
    background: white;
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .pagination a,
[data-theme="dark"] .pagination span {
    background: var(--bg-container);
}

.pagination a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.pagination .current {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.pagination .disabled {
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.5;
    border-color: var(--border-light);
}

.pagination .disabled:hover {
    background: white;
    transform: none;
    box-shadow: var(--shadow-sm);
}

[data-theme="dark"] .pagination .disabled:hover {
    background: var(--bg-container);
}

.pagination-info {
    color: var(--text-sub);
    font-size: 13px;
    padding: 8px 12px;
    background: var(--bg-body);
    border-radius: var(--radius-md);
}

/* =========================================
   モーダル
   ========================================= */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    animation: fadeIn 0.3s ease-out;
    backdrop-filter: blur(4px);
}

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

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 32px;
    border-radius: var(--radius-xl);
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-2xl);
    animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    border: 1px solid var(--border-light);
}

[data-theme="dark"] .modal-content {
    background: var(--bg-container);
}

@keyframes slideUp {
    from {
        transform: translateY(50px) scale(0.9);
        opacity: 0;
    }
    to {
        transform: translateY(0) scale(1);
        opacity: 1;
    }
}

.modal-header {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
    color: var(--text-main);
    text-align: center;
}

.modal-body {
    margin-bottom: var(--spacing-xl);
    color: var(--text-sub);
    text-align: center;
    line-height: 1.6;
}

.modal-buttons {
    display: flex;
    gap: var(--spacing-md);
}

.btn-cancel {
    flex: 1;
    background: var(--bg-body);
    color: var(--text-main);
    border: 2px solid var(--border-color);
}

.btn-cancel:hover {
    background: var(--border-light);
    border-color: var(--text-sub);
}

.btn-delete {
    flex: 1;
    background: linear-gradient(135deg, var(--danger-color), var(--danger-dark));
    color: white;
}

.btn-delete:hover {
    box-shadow: 0 8px 20px rgba(231, 76, 60, 0.4);
}

/* =========================================
   空の状態
   ========================================= */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-sub);
}

.empty-state-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
    line-height: 1.8;
}

/* =========================================
   ローディングアニメーション
   ========================================= */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.6s linear infinite;
}

/* =========================================
   レスポンシブ対応（タブレット）
   ========================================= */
@media (max-width: 768px) {
    body { padding: var(--spacing-md); }
    .container { border-radius: var(--radius-xl); }
    .messages-area { height: 650px; padding: var(--spacing-lg); }
    .message-content { max-width: 80%; }
    .theme-toggle { top: 10px; right: 10px; width: 45px; height: 45px; }
    .toast-container { right: 10px; max-width: 90%; }
    .toast { min-width: 280px; }
}

/* =========================================
   レスポンシブ対応（スマホ）
   ========================================= */
@media (max-width: 600px) {
    body { padding: 0; }
    .container { border-radius: 0; min-height: 100vh; box-shadow: none; }
    .header { padding: var(--spacing-lg); border-radius: 0; }
    .header h1 { font-size: 20px; }
    .messages-area { height: 600px; padding: var(--spacing-md); }
    .message { margin: var(--spacing-md) 0; }
    .message-content { max-width: 85%; }
    .message-icon { width: 40px; height: 40px; line-height: 40px; font-size: 16px; }
    .bubble { padding: 12px 14px; font-size: 14px; }
    .admin-mode-badge {
        position: static;
        margin-top: var(--spacing-md);
        justify-content: center;
        width: fit-content;
        margin-left: auto;
        margin-right: auto;
    }
    .input-area { padding: var(--spacing-lg); }
    .input-group { flex-direction: column; gap: var(--spacing-sm); }
    button { padding: 12px 20px; font-size: 13px; }
    .pagination { padding: var(--spacing-lg); gap: var(--spacing-xs); }
    .pagination a, .pagination span { padding: 8px 12px; font-size: 13px; min-width: 40px; }
    .modal-content { padding: var(--spacing-2xl); width: 95%; }
    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
    .scroll-to-top {
        bottom: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
        font-size: 20px;
    }
    .toast-container {
        top: 60px;
        right: 10px;
        left: 10px;
        max-width: none;
    }
    .toast {
        min-width: auto;
        width: 100%;
    }
    .emoji-panel {
        width: 280px;
        grid-template-columns: repeat(7, 1fr);
    }
}

/* =========================================
   印刷用スタイル
   ========================================= */
@media print {
    body { background: white; padding: 0; }
    .container { box-shadow: none; border: 1px solid #ddd; }
    .input-area, .pagination, .delete-btn, .admin-delete-btn,
    .admin-mode-badge, .admin-logout-btn, .theme-toggle,
    .scroll-to-top, .toast-container, .emoji-picker {
        display: none !important;
    }
    .messages-area { height: auto; overflow: visible; }
    .message { page-break-inside: avoid; }
}

/* =========================================
   アクセシビリティ対応
   ========================================= */
*:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}