/**
 * Anaba OffJapan メインスタイル
 * 
 * @package Anaba OffJapan
 * @since 1.0.0
 */

/* ========================================
   基本設定
   ======================================== */

:root {
    /* カラーパレット */
    --color-primary: #667eea;
    --color-primary-dark: #5568d3;
    --color-secondary: #764ba2;
    --color-accent: #ffb7c5;  /* 桜色 */
    --color-ai: #1e3a5f;      /* 藍 */
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    
    /* ニュートラルカラー */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    
    /* フォント */
    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-japanese: "Noto Sans JP", "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    
    /* レイアウト */
    --container-max-width: 1200px;
    --header-height: 60px;
    
    /* シャドウ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family-japanese);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: opacity 0.3s ease;
}

a:hover {
    opacity: 0.8;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ========================================
   レイアウト
   ======================================== */

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.container-narrow {
    max-width: 800px;
}

.container-wide {
    max-width: 1400px;
}

/* ========================================
   ヘッダー
   ======================================== */

.site-header {
    background: var(--color-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
}

.site-logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--color-primary);
}

.site-nav {
    display: flex;
    gap: 20px;
}

.nav-link {
    color: var(--color-gray-700);
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

.nav-link:hover {
    background-color: var(--color-gray-100);
    opacity: 1;
}

/* ========================================
   ヒーローセクション
   ======================================== */

.hero {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: 80px 0;
    text-align: center;
}

.hero-title {
    font-size: 3rem;
    margin-bottom: 16px;
    font-weight: bold;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.hero-tagline {
    font-size: 1.5rem;
    font-weight: bold;
    margin: 40px 0 20px;
}

/* ========================================
   ボタン
   ======================================== */

.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-gray-100);
    color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-gray-200);
    opacity: 1;
}

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

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

.btn-block {
    display: block;
    width: 100%;
}

/* ========================================
   フォーム
   ======================================== */

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--color-gray-700);
}

.form-control {
    width: 100%;
    padding: 12px;
    font-size: 1rem;
    border: 1px solid var(--color-gray-300);
    border-radius: 6px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control::placeholder {
    color: var(--color-gray-400);
}

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

/* ========================================
   カード
   ======================================== */

.card {
    background: var(--color-white);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
}

.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
}

.card-body {
    padding: 20px;
}

.card-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
}

/* ========================================
   フォーラム
   ======================================== */

.forum-category-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
}

.forum-category-table th,
.forum-category-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

.forum-category-table th {
    background: var(--color-gray-50);
    font-weight: 600;
}

.forum-category-table tr:hover {
    background: var(--color-gray-50);
}

.topic-list {
    list-style: none;
}

.topic-item {
    padding: 16px;
    border-bottom: 1px solid var(--color-gray-200);
    transition: background-color 0.3s ease;
}

.topic-item:hover {
    background: var(--color-gray-50);
}

.topic-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.topic-meta {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

/* ========================================
   ユーティリティ
   ======================================== */

.text-center {
    text-align: center;
}

.text-right {
    text-align: right;
}

.text-muted {
    color: var(--color-gray-500);
}

.text-primary {
    color: var(--color-primary);
}

.text-success {
    color: var(--color-success);
}

.text-danger {
    color: var(--color-error);
}

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }

/* ========================================
   アラート
   ======================================== */

.alert {
    padding: 16px;
    border-radius: 6px;
    margin: 20px 0;
}

.alert-success {
    background: #d1fae5;
    border-left: 4px solid var(--color-success);
    color: #065f46;
}

.alert-error {
    background: #fee2e2;
    border-left: 4px solid var(--color-error);
    color: #991b1b;
}

.alert-warning {
    background: #fef3c7;
    border-left: 4px solid var(--color-warning);
    color: #92400e;
}

.alert-info {
    background: #dbeafe;
    border-left: 4px solid var(--color-primary);
    color: #1e40af;
}

/* ========================================
   フッター
   ======================================== */

.site-footer {
    background: var(--color-gray-800);
    color: var(--color-gray-300);
    padding: 40px 0;
    margin-top: 60px;
}

.footer-inner {
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.footer-link {
    color: var(--color-gray-400);
}

.footer-link:hover {
    color: var(--color-white);
    opacity: 1;
}

.copyright {
    font-size: 0.875rem;
    color: var(--color-gray-500);
}

/* ========================================
   レスポンシブ
   ======================================== */

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .header-inner {
        flex-direction: column;
        height: auto;
        padding: 10px 0;
    }
    
    .site-nav {
        margin-top: 10px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .forum-category-table {
        font-size: 0.875rem;
    }
    
    .btn {
        padding: 10px 16px;
    }
}

/* ========================================
   アニメーション
   ======================================== */

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

.fade-in {
    animation: fadeIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        transform: translateX(-20px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

/* ========================================
   ロード中
   ======================================== */

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--color-gray-300);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}