/* ==========================================
   MCGStarCraft プレイヤーマニュアル CSS
   ========================================== */

/* リセットと基本設定 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット */
    --primary-color: #4a90e2;
    --secondary-color: #5cb85c;
    --danger-color: #d9534f;
    --warning-color: #f0ad4e;
    --dark-bg: #1a1a2e;
    --light-bg: #f8f9fa;
    --text-dark: #333;
    --text-light: #666;
    --border-color: #dee2e6;
    
    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: #fff;
}

/* ==========================================
   ナビゲーションバー
   ========================================== */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 60px;
}

.nav-brand h1 {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu a:hover {
    background-color: rgba(255,255,255,0.1);
}

.nav-menu a.active {
    background-color: rgba(255,255,255,0.2);
    border-radius: 4px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: white;
    margin: 3px 0;
    transition: 0.3s;
}

/* ==========================================
   メインコンテンツ
   ========================================== */
main {
    margin-top: 60px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

.bg-light {
    background-color: var(--light-bg);
}

.bg-dark {
    background-color: #1a1a1a;
    color: #ffffff;
}

.bg-dark h2, .bg-dark h3 {
    color: #ffffff;
}

.resource-pack-info {
    text-align: center;
    padding: var(--spacing-lg) 0;
}

.download-section {
    margin: var(--spacing-lg) 0;
}

.server-config-info {
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    text-align: left;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.code-block {
    background-color: #000;
    padding: var(--spacing-md);
    border-radius: 4px;
    margin: var(--spacing-sm) 0;
    overflow-x: auto;
}

.code-block code {
    color: #00ff00;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    word-break: break-all;
}

.config-note {
    font-size: 14px;
    color: #b0b0b0;
    margin-top: var(--spacing-sm);
}

h2 {
    font-size: 2rem;
    margin-bottom: var(--spacing-lg);
    color: var(--text-dark);
    text-align: center;
}

h3 {
    font-size: 1.5rem;
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    color: var(--text-dark);
}

h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

/* ==========================================
   ヒーローセクション
   ========================================== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1440 320"><path fill="%23ffffff" fill-opacity="0.1" d="M0,96L48,112C96,128,192,160,288,165.3C384,171,480,149,576,154.7C672,160,768,192,864,197.3C960,203,1056,181,1152,165.3C1248,149,1344,139,1392,133.3L1440,128L1440,320L1392,320C1344,320,1248,320,1152,320C1056,320,960,320,864,320C768,320,672,320,576,320C480,320,384,320,288,320C192,320,96,320,48,320L0,320Z"></path></svg>') no-repeat bottom;
    background-size: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
}

.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background-color: white;
    color: #667eea;
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

/* ==========================================
   カード
   ========================================== */
.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.card {
    background: white;
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.card ul {
    list-style-position: inside;
    color: var(--text-light);
}

/* ==========================================
   資源グリッド
   ========================================== */
.resource-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.resource-item {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: center;
    transition: border-color 0.3s;
}

.resource-item:hover {
    border-color: var(--primary-color);
}

.resource-image {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-sm) auto;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

.resource-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.resource-item h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-xs);
}

.resource-item code {
    display: block;
    margin-top: var(--spacing-sm);
    padding: var(--spacing-xs);
    background-color: #f4f4f4;
    border-radius: 4px;
    font-size: 0.85rem;
}

.resource-world {
    color: var(--secondary-color);
    font-weight: bold;
    margin-top: var(--spacing-xs);
    font-size: 0.9rem;
}

/* ==========================================
   クラフティングフロー
   ========================================== */
.crafting-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.craft-step {
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    min-width: 200px;
    text-align: center;
}

.craft-location {
    color: var(--secondary-color);
    font-weight: bold;
    margin-top: var(--spacing-xs);
}

.arrow {
    font-size: 2rem;
    color: var(--primary-color);
}

/* ==========================================
   機械カード
   ========================================== */
.machine-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.machine-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: relative;
}

.machine-card.featured {
    border: 3px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(76, 174, 76, 0.3);
}

.important-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--primary-color);
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.85em;
    z-index: 1;
}

.machine-card h3 {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-md);
    margin: 0;
}

.machine-info,
.machine-usage {
    padding: var(--spacing-md);
}

.packager-info {
    background: #f0f8ff;
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    margin: var(--spacing-md) 0;
}

.machine-recipes {
    background: #f9f9f9;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-sm) 0;
    border-radius: 4px;
}

.packager-tips {
    background: #fffbf0;
    padding: var(--spacing-sm) var(--spacing-md);
    margin: var(--spacing-sm) 0;
    border-radius: 4px;
    border: 1px solid #ffc107;
}

.packager-tips .tip {
    margin: 0;
    color: #856404;
    font-size: 0.9em;
}

/* 惑星環境要件セクション */
.bg-warning {
    background-color: #fff3cd;
    border-top: 3px solid #ffc107;
    border-bottom: 3px solid #ffc107;
}

.planet-requirements {
    margin-top: var(--spacing-lg);
}

.requirements-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.requirements-table th {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: var(--spacing-sm);
    text-align: left;
}

.requirements-table td {
    padding: var(--spacing-sm);
    border-bottom: 1px solid #dee2e6;
}

.requirements-table tr.danger-high {
    background-color: #fff5f5;
}

.requirements-table tr.danger-extreme {
    background-color: #ffe5e5;
}

.equipment-requirements {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.requirement-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 2px solid #dee2e6;
}

.requirement-card.recommended {
    border: 3px solid #28a745;
    background: #f0fff4;
}

.recommended-first {
    background-color: #e7f5ff;
}

.badge-new {
    background: #28a745;
    color: white;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75em;
    margin-left: 8px;
}

.badge-intermediate {
    background: #ffc107;
    color: #333;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75em;
    margin-left: 8px;
}

.requirement-card h4 {
    color: #333;
    margin-bottom: var(--spacing-sm);
}

.requirement-card ul {
    list-style: none;
    padding: 0;
}

.requirement-card li {
    padding: var(--spacing-xs) 0;
    padding-left: var(--spacing-md);
    position: relative;
}

.requirement-card li:before {
    content: "•";
    position: absolute;
    left: 0;
}

.requirement-card li.critical {
    background-color: #ffe5e5;
    padding: var(--spacing-sm);
    border-radius: 4px;
    font-weight: bold;
    color: #d9534f;
}

.requirement-card li.critical:before {
    content: "⚠️";
}

.warning-message {
    background-color: #f8d7da;
    color: #721c24;
    padding: var(--spacing-sm);
    border-radius: 4px;
    border: 1px solid #f5c6cb;
    margin-top: var(--spacing-sm);
}

.upgrade-tip {
    background: #f0f8ff;
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid #4a90e2;
    margin-top: var(--spacing-lg);
}

.important-note {
    background-color: #fff3cd;
    color: #856404;
    padding: var(--spacing-sm);
    border-radius: 4px;
    border: 1px solid #ffeeba;
    margin: var(--spacing-sm) 0;
}

.info-message {
    background-color: #d1ecf1;
    color: #0c5460;
    padding: var(--spacing-sm);
    border-radius: 4px;
    border: 1px solid #bee5eb;
    margin-top: var(--spacing-sm);
}

/* 惑星探索順序 */
.exploration-order {
    background: linear-gradient(135deg, #f0f8ff, #e6f3ff);
    padding: var(--spacing-lg);
    border-radius: 8px;
    margin: var(--spacing-lg) 0;
}

.order-list {
    list-style: none;
    padding: 0;
}

.order-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0;
    background: white;
    border-radius: 8px;
    border: 2px solid #dee2e6;
}

.order-item.recommended {
    border-color: #28a745;
    background: #f0fff4;
}

.order-number {
    width: 40px;
    height: 40px;
    background: #667eea;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: var(--spacing-md);
}

.order-planet {
    flex: 1;
    font-weight: bold;
    font-size: 1.1em;
}

.order-level {
    color: #666;
}

/* 装備ボックス */
.equipment-box {
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-md) 0;
}

.equipment-box.success {
    background: #d4edda;
    border: 2px solid #28a745;
}

.equipment-box.warning {
    background: #fff3cd;
    border: 2px solid #ffc107;
}

.tips-box {
    background: #f0f8ff;
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid #4a90e2;
}

/* レベル表示 */
.level-low {
    color: #28a745;
    font-weight: bold;
}

.level-medium {
    color: #ffc107;
    font-weight: bold;
}

.level-high {
    color: #dc3545;
    font-weight: bold;
}

/* 比較表 */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--spacing-lg) 0;
}

.comparison-table th {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: var(--spacing-sm);
}

.comparison-table td {
    padding: var(--spacing-sm);
    border: 1px solid #dee2e6;
}

.mars-row {
    background: #f0fff4;
}

.machine-info {
    background-color: var(--light-bg);
}

.machine-usage ol {
    padding-left: var(--spacing-md);
    color: var(--text-light);
}

/* ==========================================
   宇宙服グリッド
   ========================================== */
.spacesuit-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.suit-part {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-align: center;
}

.suit-part h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
}

.feature {
    color: var(--secondary-color);
    font-weight: bold;
    margin-top: var(--spacing-sm);
}

/* ==========================================
   アップグレード情報
   ========================================== */
.upgrade-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.upgrade-process,
.upgrade-types {
    background: white;
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* ==========================================
   材料グリッド
   ========================================== */
.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-md) 0;
}

.material-category {
    background: var(--light-bg);
    border-radius: 8px;
    padding: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.material-category h5 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: var(--spacing-xs);
}

.material-category ul {
    list-style: none;
    padding: 0;
}

.material-category li {
    padding: 4px 0;
    font-size: 0.9rem;
}

.material-category li::before {
    content: "• ";
    color: var(--secondary-color);
    font-weight: bold;
}

/* ==========================================
   ロケットガイド
   ========================================== */
.rocket-guide {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.rocket-build,
.launch-process {
    background: white;
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.launch-steps {
    counter-reset: step;
    list-style: none;
}

.launch-steps li {
    counter-increment: step;
    margin-bottom: var(--spacing-md);
    position: relative;
    padding-left: 40px;
}

.launch-steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    background: var(--primary-color);
    color: white;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* ==========================================
   惑星カード
   ========================================== */
.planet-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.planet-card {
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border: 3px solid;
    position: relative;
}

.planet-thumbnail {
    width: 100%;
    height: 150px;
    object-fit: cover;
    display: block;
}

.planet-resources {
    background: rgba(0, 0, 0, 0.05);
    border-radius: 4px;
}

.planet-resources h4 {
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.planet-resources ul {
    margin: 0;
    padding-left: 20px;
    font-size: 0.85rem;
}

.planet-detail-link {
    display: inline-block;
    margin: 10px var(--spacing-md);
    color: var(--primary-color);
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s;
}

.planet-detail-link:hover {
    color: #764ba2;
    text-decoration: underline;
}

.planet-card.safe {
    border-color: var(--secondary-color);
}

.planet-card.moderate {
    border-color: var(--primary-color);
}

.planet-card.dangerous {
    border-color: var(--warning-color);
}

.planet-card.extreme {
    border-color: var(--danger-color);
}

.planet-card.recommended {
    border-color: #28a745;
    background: #f0fff4;
}

.success-text {
    color: #28a745;
    font-weight: bold;
}

.warning-text {
    color: #dc3545;
    font-weight: bold;
}

.planet-card h3 {
    padding: var(--spacing-md);
    margin: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.planet-stats,
.planet-tips,
.planet-resources {
    padding: var(--spacing-md);
}

.planet-stats,
.planet-tips {
    padding: var(--spacing-md);
}

.planet-stats {
    background-color: var(--light-bg);
}

.planet-stats p {
    margin: var(--spacing-xs) 0;
}

/* ==========================================
   サバイバルヒント
   ========================================== */
.survival-tips {
    margin-top: var(--spacing-xl);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.tip {
    background: #fff3cd;
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-md);
    border-radius: 4px;
}

.tip h4 {
    color: var(--warning-color);
    margin-bottom: var(--spacing-xs);
}

/* ==========================================
   コマンドセクション
   ========================================== */
.command-sections {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.command-group {
    background: white;
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.command-group h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

pre {
    background: #f4f4f4;
    border-radius: 4px;
    padding: var(--spacing-md);
    overflow-x: auto;
    margin: var(--spacing-sm) 0;
}

code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.command-note {
    background: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
    padding: var(--spacing-md);
    margin-top: var(--spacing-lg);
    color: #721c24;
}

/* ==========================================
   画像スタイル
   ========================================== */
.card-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
}

.section-image {
    width: 100%;
    max-width: 800px;
    height: auto;
    margin: var(--spacing-lg) auto;
    display: block;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.craft-image {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin-bottom: var(--spacing-sm);
}

.machine-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
}

.machine-card img {
    margin: 0;
}

.step-image {
    width: 100%;
    max-width: 300px;
    height: auto;
    margin: var(--spacing-sm) 0;
    border-radius: 4px;
}

.planet-screenshots {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.planet-screenshot {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.planet-screenshot:hover {
    transform: scale(1.05);
}

/* ==========================================
   惑星詳細ページ
   ========================================== */
.planet-section {
    margin: var(--spacing-xl) 0;
}

.planet-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
}

.planet-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}

.planet-details {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 8px;
}

.planet-details h3 {
    color: var(--primary-color);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.feature-box,
.resource-box,
.warning-box,
.event-box {
    background: var(--light-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-md) 0;
}

.warning-box {
    background: #fff3cd;
    border-left: 4px solid var(--warning-color);
}

.event-box {
    background: #f8d7da;
    border-left: 4px solid var(--danger-color);
}

.nav-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.nav-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-md);
    text-decoration: none;
    color: var(--text-dark);
    transition: all 0.3s;
}

.nav-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.nav-card h3 {
    color: var(--primary-color);
    margin: 0 0 var(--spacing-xs) 0;
}

.nav-card p {
    color: var(--text-light);
    margin: 0;
}

.oxygen-system-section {
    margin: var(--spacing-xl) 0;
}

.system-box {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.generator-info {
    margin: var(--spacing-md) 0;
}

.generator-info h4 {
    color: var(--primary-color);
    margin: var(--spacing-md) 0 var(--spacing-sm) 0;
}

.oxygen-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.method-card {
    background: var(--light-bg);
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 2px solid var(--border-color);
}

.method-card h4 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.poi-section {
    margin: var(--spacing-xl) 0;
}

.poi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.poi-card {
    background: white;
    border-radius: 8px;
    padding: var(--spacing-lg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    border: 2px solid var(--border-color);
    transition: all 0.3s;
}

.poi-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.15);
}

.poi-card h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.poi-info p {
    margin: var(--spacing-sm) 0;
}

.poi-tip {
    background: var(--light-bg);
    padding: var(--spacing-sm);
    border-radius: 4px;
    margin-top: var(--spacing-sm);
    font-style: italic;
}

.special-systems {
    margin-top: var(--spacing-xl);
}

.system-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.system-card {
    background: linear-gradient(to bottom, white, var(--light-bg));
    padding: var(--spacing-md);
    border-radius: 8px;
    border-left: 4px solid var(--secondary-color);
}

.system-card h4 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

@media (max-width: 768px) {
    .planet-content {
        grid-template-columns: 1fr;
    }
    
    .planet-image {
        height: 200px;
    }
    
    .oxygen-methods {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   建築ガイド
   ========================================== */
.construction-guide {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.construction-card {
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: var(--spacing-lg);
    transition: border-color 0.3s;
}

.construction-card:hover {
    border-color: var(--primary-color);
}

.construction-card h4 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.construction-tip {
    background: #e3f2fd;
    padding: var(--spacing-sm);
    border-left: 3px solid var(--primary-color);
    margin-top: var(--spacing-sm);
    font-style: italic;
}

.airlock-diagram,
.farm-diagram {
    background: #f5f5f5;
    padding: var(--spacing-md);
    border-radius: 4px;
    margin: var(--spacing-sm) 0;
}

.airlock-diagram pre,
.farm-diagram pre {
    margin: 0;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.4;
}

/* ==========================================
   タイムライン
   ========================================== */
.priority-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.timeline-item {
    background: linear-gradient(to bottom, white, var(--light-bg));
    border-radius: 8px;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    position: relative;
}

.timeline-item h4 {
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.1rem;
}

.timeline-item ol {
    padding-left: var(--spacing-md);
    margin: 0;
}

.timeline-item li {
    margin: var(--spacing-xs) 0;
}

/* 画像が読み込まれていない場合のプレースホルダー */
img {
    background: linear-gradient(135deg, #f5f5f5 0%, #e0e0e0 100%);
    position: relative;
}

img::before {
    content: attr(alt);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #999;
    font-size: 0.9rem;
    text-align: center;
    padding: var(--spacing-sm);
}

img[src=""] {
    min-height: 150px;
}

/* ==========================================
   フッター
   ========================================== */
.footer {
    background: var(--dark-bg);
    color: white;
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer p {
    margin: var(--spacing-xs) 0;
}

/* ==========================================
   レスポンシブデザイン
   ========================================== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 60px;
        flex-direction: column;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0,0,0,0.05);
        padding: var(--spacing-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .rocket-guide,
    .upgrade-info,
    .command-sections {
        grid-template-columns: 1fr;
    }

    .crafting-flow {
        flex-direction: column;
    }

    .arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 480px) {
    .cards,
    .resource-grid,
    .machine-grid,
    .planet-grid,
    .spacesuit-grid,
    .tips-grid {
        grid-template-columns: 1fr;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }
}