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

:root {
    --primary-color: #000000;
    --secondary-color: #333333;
    --bg-dark: #ffffff;
    --bg-darker: #f5f5f5;
    --bg-card: #ffffff;
    --text-primary: #000000;
    --text-secondary: #666666;
    --border-color: #e0e0e0;
    --accent-green: #000000;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.8;
    overflow-x: hidden;
    letter-spacing: 0;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ヘッダー */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 1.5rem 0;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    color: #000000;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -0.5px;
    display: block;
    text-shadow: none;
}

.logo-subtext {
    font-size: 0.625rem;
    font-weight: 400;
    color: #666666;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0.5px;
    margin-top: 0.125rem;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .logo-text {
        font-size: 1.1rem;
        letter-spacing: 1px;
    }
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: all 0.3s;
    font-weight: 400;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0;
    position: relative;
}

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

/* ヒーローセクション */
.hero {
    padding: 10rem 0 2rem;
    text-align: center;
    background: #ffffff;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: #000000;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -1px;
}

.hero-title::first-line {
    letter-spacing: 2px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0;
    transform: none;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}

.btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    border: 1px solid #000000;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

.btn-primary {
    background: #000000;
    color: white;
}

.btn-primary:hover {
    background: #333333;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--primary-color);
}

.provider-icons {
    display: flex;
    gap: 2rem;
    justify-content: center;
    margin-top: 2rem;
}

.provider-icon {
    padding: 0.5rem 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    transform: none;
}

/* 統計情報セクション */
.stats {
    padding: 4rem 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 3rem;
    text-align: center;
}

.stat-item {
    padding: 1rem;
}

.stat-number {
    font-size: 4rem;
    font-weight: 700;
    color: #000000;
    margin-bottom: 0.5rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -2px;
    transform: none;
    display: inline-block;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: 0;
}

/* プロバイダーロゴグリッド */
.providers {
    padding: 4rem 0;
    background: var(--bg-darker);
}

.providers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1.5rem;
}

.provider-logo {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-secondary);
    transition: all 0.3s;
}

.provider-logo:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* 機能セクション */
.features {
    /* padding: 2rem 0; */
}

.feature-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-bottom: 6rem;
    padding: 3rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--border-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.feature-card-simple {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    margin-bottom: 2rem;
}

.simple-section {
    padding: 3rem 0;
}

.simple-section .section-title {
    text-align: center;
}

.feature-title {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -0.5px;
}

.feature-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.feature-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.3s;
}

.feature-link:hover {
    color: var(--secondary-color);
}

.feature-visual {
    padding: 2rem;
    background: var(--bg-darker);
    border-radius: 0.75rem;
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-image {
    width: 100%;
    height: auto;
    border-radius: 0.5rem;
    object-fit: contain;
}

.model-card {
    padding: 1.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    width: 100%;
}

.model-name {
    display: block;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.routing-visual {
    padding: 2rem;
    background: var(--bg-darker);
    border-radius: 0.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.availability-visual {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    width: 100%;
}

.provider-status {
    padding: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--accent-green);
    border-radius: 0.5rem;
    color: var(--text-primary);
    text-align: center;
}

.rag-overview {
    width: 100%;
    text-align: left;
}

.overview-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.overview-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.overview-list li {
    padding: 0.75rem 0;
    color: var(--text-primary);
    font-size: 0.95rem;
    line-height: 1.6;
    border-bottom: 1px solid var(--border-color);
}

.overview-list li:last-child {
    border-bottom: none;
}

.overview-list strong {
    color: var(--text-primary);
    font-weight: 600;
}

.performance-graph {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    height: 200px;
    padding: 1rem;
}

.graph-bar {
    flex: 1;
    background: linear-gradient(180deg, var(--primary-color), var(--secondary-color));
    border-radius: 0.25rem;
    min-height: 40px;
}

.data-policy-visual {
    text-align: center;
    padding: 2rem;
}

.policy-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

/* Featured Agents */
.featured-agents {
    padding: 6rem 0;
    background: var(--bg-darker);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    letter-spacing: -0.5px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.section-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.section-link:hover {
    color: var(--secondary-color);
}

.agents-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.agent-card {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s;
}

.agent-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.agent-preview {
    height: 150px;
    background: var(--bg-darker);
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.agent-name {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.agent-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* サインアップフロー */
.signup-flow {
    padding: 6rem 0;
}

.flow-steps {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
}

.flow-step {
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
}

.step-number {
    width: 3rem;
    height: 3rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.step-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.step-description {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.step-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.step-btn {
    padding: 0.75rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.3s;
}

.step-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-card);
}

.credit-history {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.credit-item {
    padding: 0.75rem;
    background: var(--bg-darker);
    border-radius: 0.5rem;
    font-size: 0.9rem;
}

.api-key-display {
    padding: 1rem;
    background: var(--bg-darker);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    font-family: monospace;
    font-size: 0.85rem;
}

.api-key-label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

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

/* Explore Section */
.explore-section {
    padding: 4rem 0;
    background: var(--bg-darker);
}

.explore-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.explore-card {
    padding: 2.5rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s;
}

.explore-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.explore-card h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.explore-card p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.explore-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.explore-link:hover {
    color: var(--secondary-color);
}

/* Announcements */
.announcements {
    padding: 6rem 0;
}

.announcements .section-title {
    text-align: left;
    margin-bottom: 0.5rem;
}

.announcements .section-link {
    display: inline-block;
    margin-bottom: 2rem;
}

.announcements-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.announcement-card {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    transition: all 0.3s;
}

.announcement-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
}

.announcement-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.4;
}

.announcement-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.announcement-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* フッター */
.footer {
    background: var(--bg-darker);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 4rem;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.footer-column {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-heading {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s;
}

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

.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    background: var(--accent-green);
    color: white;
    font-size: 0.75rem;
    border-radius: 0.25rem;
    margin-left: 0.5rem;
}

/* レスポンシブデザイン */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-card {
        grid-template-columns: 1fr;
    }
    
    .agents-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .flow-steps {
        grid-template-columns: 1fr;
    }
    
    .announcements-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .nav-links {
        display: none;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .agents-grid {
        grid-template-columns: 1fr;
    }
    
    .explore-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}