/* ==========================================================================
   NyaoTechED - Main Stylesheet
   Qiita/Zenn風のクリーンデザイン + ブルー系アクセント
   ========================================================================== */

:root {
    /* カラーパレット - マスコット（青系）を意識 */
    --color-primary: #3ea8ff;          /* Zenn風のブルー */
    --color-primary-dark: #2b82cc;
    --color-primary-light: #e6f3ff;
    --color-accent: #5eead4;            /* ティール系アクセント */
    
    /* ベース */
    --color-bg: #ffffff;
    --color-bg-subtle: #f6f8fa;
    --color-bg-card: #ffffff;
    --color-border: #e6e6e6;
    --color-border-hover: #3ea8ff;
    
    /* テキスト */
    --color-text: #1a1a1a;
    --color-text-secondary: #6b7280;
    --color-text-muted: #9ca3af;
    
    /* 状態色 */
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    
    /* シャドウ */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.08);
    
    /* 角丸 */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* 間隔 */
    --container-max: 1200px;
    --sidebar-width: 280px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", Meiryo, sans-serif;
    font-size: 16px;
    line-height: 1.75;
    color: var(--color-text);
    background: var(--color-bg-subtle);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.15s ease;
}

a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}

/* ==========================================================================
   ヘッダー
   ========================================================================== */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: saturate(180%) blur(10px);
    background-color: rgba(255, 255, 255, 0.85);
}

.header-inner {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    gap: 24px;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 20px;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}

.site-logo:hover {
    text-decoration: none;
    color: var(--color-primary);
}

.site-logo-icon {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 18px;
}

.header-search {
    flex: 1;
    max-width: 560px;
    position: relative;
}

.header-search input {
    width: 100%;
    height: 40px;
    padding: 0 16px 0 40px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    background: var(--color-bg-subtle);
    font-size: 14px;
    transition: all 0.15s ease;
}

.header-search input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-bg);
    box-shadow: 0 0 0 3px rgba(62, 168, 255, 0.15);
}

.header-search::before {
    content: "🔍";
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 14px;
    pointer-events: none;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-left: auto;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease;
    text-decoration: none;
    white-space: nowrap;
    font-family: inherit;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    border-color: var(--color-primary-dark);
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background: var(--color-bg);
    color: var(--color-text);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    text-decoration: none;
}

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

.btn-danger:hover {
    background: #dc2626;
    color: white;
    text-decoration: none;
}

.btn-sm {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-lg {
    padding: 12px 24px;
    font-size: 16px;
}

/* ==========================================================================
   レイアウト
   ========================================================================== */
.main-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 32px 24px;
    display: grid;
    grid-template-columns: 1fr var(--sidebar-width);
    gap: 32px;
}

@media (max-width: 900px) {
    .main-container {
        grid-template-columns: 1fr;
    }
}

.content-area {
    min-width: 0;
}

.sidebar {
    position: sticky;
    top: 96px;
    align-self: start;
}

/* ==========================================================================
   サイドバー
   ========================================================================== */
.sidebar-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 16px;
}

.sidebar-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}

.category-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.category-list a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 14px;
    text-decoration: none;
    transition: all 0.15s ease;
}

.category-list a:hover {
    background: var(--color-bg-subtle);
    color: var(--color-primary);
    text-decoration: none;
}

.category-list a.active {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-weight: 500;
}

.category-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    flex-shrink: 0;
}

/* ==========================================================================
   記事カード（一覧）
   ========================================================================== */
.page-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--color-text);
}

.article-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.article-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    transition: all 0.15s ease;
    display: block;
    text-decoration: none;
    color: inherit;
}

.article-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
    text-decoration: none;
    color: inherit;
}

.article-card-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--color-text);
    line-height: 1.5;
}

.article-card-summary {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-card-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    font-size: 12px;
    color: var(--color-text-muted);
}

.category-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 500;
    background: var(--color-bg-subtle);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    text-decoration: none;
}

.category-tag:hover {
    border-color: var(--color-primary);
    text-decoration: none;
}

.empty-state {
    background: var(--color-bg-card);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius-md);
    padding: 48px 24px;
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-state-icon {
    font-size: 48px;
    margin-bottom: 16px;
    opacity: 0.5;
}

/* ==========================================================================
   記事詳細
   ========================================================================== */
.article-detail {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 48px;
}

@media (max-width: 640px) {
    .article-detail {
        padding: 24px 20px;
    }
}

.article-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-border);
}

.article-title {
    font-size: 32px;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
}

.article-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

/* 記事本文 */
.article-content {
    font-size: 16px;
    line-height: 1.85;
    color: var(--color-text);
}

.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
    margin-top: 2em;
    margin-bottom: 0.8em;
    font-weight: 700;
    line-height: 1.4;
    letter-spacing: -0.01em;
}

.article-content h1 { font-size: 28px; border-bottom: 2px solid var(--color-border); padding-bottom: 0.3em; }
.article-content h2 { font-size: 24px; border-bottom: 1px solid var(--color-border); padding-bottom: 0.3em; }
.article-content h3 { font-size: 20px; }
.article-content h4 { font-size: 18px; }

.article-content p {
    margin-bottom: 1.2em;
}

.article-content strong {
    font-weight: 700;
    color: var(--color-text);
}

.article-content em {
    font-style: italic;
}

.article-content ul,
.article-content ol {
    margin-bottom: 1.2em;
    padding-left: 1.8em;
}

.article-content li {
    margin-bottom: 0.4em;
}

.article-content blockquote {
    border-left: 4px solid var(--color-primary);
    background: var(--color-primary-light);
    padding: 12px 20px;
    margin: 1.2em 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--color-text);
}

.article-content code {
    background: var(--color-bg-subtle);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 0.9em;
    color: #d6336c;
    border: 1px solid var(--color-border);
}

.article-content pre {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px 20px;
    border-radius: var(--radius-md);
    overflow-x: auto;
    margin: 1.2em 0;
    font-size: 14px;
    line-height: 1.6;
}

.article-content pre code {
    background: transparent;
    border: none;
    padding: 0;
    color: inherit;
    font-size: inherit;
}

.article-content img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1em 0;
    display: block;
}

.article-content a {
    color: var(--color-primary);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

/* ==========================================================================
   マスコット吹き出し
   ========================================================================== */
.mascot-speech {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    margin: 24px 0;
    padding: 0;
}

.mascot-speech.mascot-right {
    flex-direction: row-reverse;
}

.mascot-image {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    flex-shrink: 0;
    background: linear-gradient(135deg, #3ea8ff, #5eead4);
    border: 3px solid var(--color-bg);
    box-shadow: var(--shadow-md);
    object-fit: cover;
}

.speech-bubble {
    position: relative;
    background: var(--color-primary-light);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    flex: 1;
    font-size: 15px;
    line-height: 1.7;
    color: var(--color-text);
}

.speech-bubble::before {
    content: '';
    position: absolute;
    top: 20px;
    left: -10px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 8px 10px 8px 0;
    border-color: transparent var(--color-primary) transparent transparent;
}

.speech-bubble::after {
    content: '';
    position: absolute;
    top: 20px;
    left: -7px;
    width: 0;
    height: 0;
    border-style: solid;
    border-width: 6px 8px 6px 0;
    border-color: transparent var(--color-primary-light) transparent transparent;
}

.mascot-speech.mascot-right .speech-bubble::before {
    left: auto;
    right: -10px;
    border-width: 8px 0 8px 10px;
    border-color: transparent transparent transparent var(--color-primary);
}

.mascot-speech.mascot-right .speech-bubble::after {
    left: auto;
    right: -7px;
    border-width: 6px 0 6px 8px;
    border-color: transparent transparent transparent var(--color-primary-light);
}

/* ==========================================================================
   フォーム関連
   ========================================================================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
}

.form-input,
.form-textarea,
.form-select {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.15s ease;
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(62, 168, 255, 0.15);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
    font-family: "SFMono-Regular", Consolas, Menlo, monospace;
    line-height: 1.6;
}

.form-help {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 4px;
}

.form-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
}

/* ==========================================================================
   エディタツールバー
   ========================================================================== */
.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    padding: 8px;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    border-bottom: none;
}

.toolbar-btn {
    padding: 6px 10px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s ease;
    color: var(--color-text);
    font-family: inherit;
}

.toolbar-btn:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.toolbar-btn strong {
    font-weight: 700;
}

.toolbar-separator {
    width: 1px;
    background: var(--color-border);
    margin: 0 4px;
}

.editor-textarea {
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    min-height: 400px;
}

/* ==========================================================================
   カテゴリ選択
   ========================================================================== */
.category-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 12px;
    background: var(--color-bg-subtle);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    min-height: 50px;
}

.category-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s ease;
    user-select: none;
}

.category-chip:hover {
    border-color: var(--color-primary);
}

.category-chip.selected {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
}

.category-chip.selected .category-dot {
    background: white !important;
}

/* ==========================================================================
   マスコット挿入モーダル
   ========================================================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: 32px;
    max-width: 500px;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.modal-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
}

.mascot-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.mascot-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s ease;
    background: var(--color-bg);
}

.mascot-option:hover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.mascot-option.selected {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}

.mascot-option img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
}

.mascot-option-label {
    font-size: 13px;
    font-weight: 500;
}

.modal-actions {
    display: flex;
    gap: 8px;
    justify-content: flex-end;
    margin-top: 20px;
}

/* ==========================================================================
   管理テーブル
   ========================================================================== */
.admin-table {
    width: 100%;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 14px;
}

.admin-table th {
    background: var(--color-bg-subtle);
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.admin-table tr:last-child td {
    border-bottom: none;
}

.admin-table tr:hover {
    background: var(--color-bg-subtle);
}

.table-actions {
    display: flex;
    gap: 6px;
}

/* ==========================================================================
   アラート
   ========================================================================== */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    font-size: 14px;
    border: 1px solid;
}

.alert-success {
    background: #f0fdf4;
    color: #166534;
    border-color: #bbf7d0;
}

.alert-error {
    background: #fef2f2;
    color: #991b1b;
    border-color: #fecaca;
}

.alert-info {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-color: var(--color-primary);
}

/* ==========================================================================
   フッター
   ========================================================================== */
.site-footer {
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding: 32px 24px;
    margin-top: 48px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 13px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

/* ==========================================================================
   ログインページ
   ========================================================================== */
.login-container {
    min-height: calc(100vh - 64px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.login-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-md);
}

.login-title {
    text-align: center;
    margin-bottom: 24px;
    font-size: 22px;
    font-weight: 700;
}

/* ==========================================================================
   レスポンシブ
   ========================================================================== */
@media (max-width: 640px) {
    .header-inner {
        padding: 0 16px;
        gap: 12px;
    }
    
    .site-logo {
        font-size: 16px;
    }
    
    .site-logo-icon {
        width: 28px;
        height: 28px;
    }
    
    .main-container {
        padding: 20px 16px;
    }
    
    .article-title {
        font-size: 24px;
    }
    
    .article-detail {
        padding: 20px 16px;
    }
    
    .mascot-speech {
        gap: 10px;
    }
    
    .mascot-image {
        width: 60px;
        height: 60px;
    }
    
    .header-nav .btn span {
        display: none;
    }
}