/**
 * SparkSheets Landing Page CSS
 * 
 * Registepスタイルを参考に、SparkSheets専用LP
 * CSS変数を全面活用
 *
 * @version 1.0.0
 * @date 2025-11-18
 */

/* ==================== CSS Variables ==================== */
:root {
    /* プライマリカラー */
    --lp-primary: #007bff;
    --lp-primary-dark: #0056b3;
    --lp-primary-light: rgba(0, 123, 255, 0.1);
    --lp-primary-hover: #0069d9;

    /* グラデーション */
    --lp-gradient-primary: linear-gradient(135deg, #007bff 0%, #0056b3 100%);
    --lp-gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --lp-gradient-cta: linear-gradient(135deg, #007bff 0%, #0056b3 100%);

    /* テキスト */
    --lp-text-primary: #222222;
    --lp-text-secondary: #666666;
    --lp-text-muted: #999999;

    /* 背景 */
    --lp-bg-primary: #ffffff;
    --lp-bg-secondary: #f7f9fb;
    --lp-bg-tertiary: #f3f4f6;

    /* ボーダー */
    --lp-border: #e5e7eb;
    --lp-border-light: #f0f0f0;

    /* シャドウ */
    --lp-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --lp-shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --lp-shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --lp-shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);

    /* スペーシング */
    --lp-spacing-xs: 0.5rem;
    --lp-spacing-sm: 1rem;
    --lp-spacing-md: 1.5rem;
    --lp-spacing-lg: 2rem;
    --lp-spacing-xl: 3rem;
    --lp-spacing-2xl: 4rem;
    --lp-spacing-3xl: 6rem;

    /* 角丸 */
    --lp-radius-sm: 4px;
    --lp-radius-md: 8px;
    --lp-radius-lg: 12px;
    --lp-radius-xl: 16px;

    /* トランジション */
    --lp-transition: 0.3s ease;

    /* フォント */
    --lp-font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ==================== Base ==================== */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body.lp-page {
    font-family: var(--lp-font-family);
    color: var(--lp-text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--lp-spacing-sm);
    font-weight: 700;
    line-height: 1.3;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin: 0 0 var(--lp-spacing-sm);
}

/* ==================== Navigation ==================== */
.lp-navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--lp-bg-primary);
    border-bottom: 1px solid var(--lp-border);
    padding: 0.75rem 0;
    z-index: 1000;
    box-shadow: var(--lp-shadow-sm);
}

.lp-navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.lp-navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--lp-primary);
    text-decoration: none;
}

.lp-navbar-links {
    display: flex;
    gap: 1.5rem;
}

.lp-navbar-links a {
    color: var(--lp-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--lp-transition);
}

.lp-navbar-links a:hover {
    color: var(--lp-primary);
}

.lp-navbar-buttons {
    display: flex;
    gap: 0.5rem;
}

.lp-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.6rem 1.25rem;
    border-radius: var(--lp-radius-md);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--lp-transition);
    cursor: pointer;
    border: none;
    font-size: 0.875rem;
}

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

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

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

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

.lp-btn-large {
    padding: 1rem 2rem;
    font-size: 1rem;
}

/* ==================== Hero Section ==================== */
.lp-hero {
    padding: 8rem 0 5rem;
    background: var(--lp-gradient-hero);
    color: white;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.lp-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 0 100 100"><circle cx="50" cy="50" r="1" fill="rgba(255,255,255,0.1)"/></svg>');
    background-size: 50px 50px;
    opacity: 0.3;
}

.lp-hero .container {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
    padding: 0 1rem;
}

.lp-hero h1 {
    font-size: 3.5rem;
    margin-bottom: var(--lp-spacing-md);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.lp-hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--lp-spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.lp-hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.lp-btn-hero {
    background: white;
    color: var(--lp-primary);
    padding: 1rem 2rem;
    font-size: 1.1rem;
    box-shadow: var(--lp-shadow-lg);
}

.lp-btn-hero:hover {
    transform: translateY(-3px);
    box-shadow: var(--lp-shadow-xl);
}

.lp-btn-hero-outline {
    background: transparent;
    color: white;
    border: 2px solid white;
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.lp-btn-hero-outline:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* ==================== Section Base ==================== */
.lp-section {
    padding: var(--lp-spacing-3xl) 0;
}

.lp-section-alt {
    background: var(--lp-bg-secondary);
}

.lp-section-title {
    text-align: center;
    margin-bottom: var(--lp-spacing-2xl);
}

.lp-section-title h2 {
    color: var(--lp-text-primary);
    margin-bottom: var(--lp-spacing-sm);
}

.lp-section-title p {
    color: var(--lp-text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* ==================== Features Grid ==================== */
.lp-features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--lp-spacing-lg);
}

.lp-feature-card {
    background: var(--lp-bg-primary);
    border-radius: var(--lp-radius-lg);
    padding: var(--lp-spacing-xl);
    box-shadow: var(--lp-shadow-sm);
    transition: all var(--lp-transition);
    border: 1px solid var(--lp-border-light);
}

.lp-feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--lp-shadow-lg);
}

.lp-feature-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--lp-radius-lg);
    background: var(--lp-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--lp-spacing-md);
}

.lp-feature-icon i {
    font-size: 1.5rem;
    color: var(--lp-primary);
}

.lp-feature-card h3 {
    margin-bottom: var(--lp-spacing-xs);
}

.lp-feature-card p {
    color: var(--lp-text-secondary);
    margin: 0;
}

/* ==================== AI Features ==================== */
.lp-ai-feature {
    display: flex;
    align-items: center;
    gap: var(--lp-spacing-2xl);
    margin-bottom: var(--lp-spacing-2xl);
}

.lp-ai-feature:nth-child(even) {
    flex-direction: row-reverse;
}

.lp-ai-feature-content {
    flex: 1;
}

.lp-ai-feature-image {
    flex: 1;
    background: var(--lp-bg-tertiary);
    border-radius: var(--lp-radius-xl);
    padding: var(--lp-spacing-lg);
    text-align: center;
}

.lp-ai-feature-image img {
    max-width: 100%;
    border-radius: var(--lp-radius-md);
}

.lp-ai-feature h3 {
    font-size: 1.75rem;
    margin-bottom: var(--lp-spacing-sm);
}

.lp-ai-feature p {
    color: var(--lp-text-secondary);
    margin-bottom: var(--lp-spacing-md);
}

.lp-ai-feature ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lp-ai-feature li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--lp-text-secondary);
}

.lp-ai-feature li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--lp-primary);
    font-weight: bold;
}

/* ==================== Pricing ==================== */
.lp-pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--lp-spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.lp-pricing-card {
    background: var(--lp-bg-primary);
    border-radius: var(--lp-radius-xl);
    padding: var(--lp-spacing-xl);
    text-align: center;
    box-shadow: var(--lp-shadow-md);
    border: 2px solid var(--lp-border-light);
    transition: all var(--lp-transition);
}

.lp-pricing-card.featured {
    border-color: var(--lp-primary);
    transform: scale(1.05);
}

.lp-pricing-card:hover {
    box-shadow: var(--lp-shadow-xl);
}

.lp-pricing-name {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--lp-spacing-sm);
}

.lp-pricing-price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--lp-primary);
    margin-bottom: var(--lp-spacing-xs);
}

.lp-pricing-price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--lp-text-muted);
}

.lp-pricing-description {
    color: var(--lp-text-secondary);
    margin-bottom: var(--lp-spacing-md);
}

.lp-pricing-features {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--lp-spacing-lg);
    text-align: left;
}

.lp-pricing-features li {
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--lp-border-light);
    color: var(--lp-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lp-pricing-features li:last-child {
    border-bottom: none;
}

.lp-pricing-features .check {
    color: var(--lp-primary);
}

.lp-pricing-features .check i {
    font-size: 1rem;
}

/* ==================== FAQ ==================== */
.lp-faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.lp-faq-item {
    background: var(--lp-bg-primary);
    border-radius: var(--lp-radius-lg);
    margin-bottom: var(--lp-spacing-sm);
    overflow: hidden;
    box-shadow: var(--lp-shadow-sm);
}

.lp-faq-question {
    padding: var(--lp-spacing-md);
    cursor: pointer;
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--lp-transition);
}

.lp-faq-question:hover {
    background: var(--lp-bg-secondary);
}

.lp-faq-question i {
    font-size: 0.875rem;
    color: var(--lp-text-muted);
    transition: transform var(--lp-transition);
}

.lp-faq-item.active .lp-faq-question i {
    transform: rotate(180deg);
}

.lp-faq-answer {
    padding: 0 var(--lp-spacing-md) var(--lp-spacing-md);
    color: var(--lp-text-secondary);
    display: none;
}

.lp-faq-item.active .lp-faq-answer {
    display: block;
}

/* ==================== CTA Section ==================== */
.lp-cta {
    background: var(--lp-gradient-cta);
    color: white;
    text-align: center;
    padding: var(--lp-spacing-3xl) 0;
}

.lp-cta h2 {
    margin-bottom: var(--lp-spacing-sm);
}

.lp-cta p {
    opacity: 0.9;
    margin-bottom: var(--lp-spacing-lg);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* ==================== Coming Soon Badge ==================== */
.lp-coming-soon {
    display: inline-block;
    background: linear-gradient(135deg, #ff9800 0%, #f57c00 100%);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--lp-radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.5rem;
}

/* ==================== Footer ==================== */
.lp-footer {
    background: var(--lp-text-primary);
    color: white;
    padding: var(--lp-spacing-2xl) 0 var(--lp-spacing-lg);
}

.lp-footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--lp-spacing-xl);
    margin-bottom: var(--lp-spacing-xl);
}

.lp-footer-col h4 {
    margin-bottom: var(--lp-spacing-md);
    font-size: 1rem;
}

.lp-footer-col ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.lp-footer-col li {
    margin-bottom: 0.5rem;
}

.lp-footer-col a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color var(--lp-transition);
}

.lp-footer-col a:hover {
    color: white;
}

.lp-footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--lp-spacing-lg);
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

/* ==================== Testimonials Section ==================== */
.lp-testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--lp-spacing-lg);
}

.lp-testimonial-card {
    background: var(--lp-bg-primary);
    border-radius: var(--lp-radius-lg);
    padding: var(--lp-spacing-xl);
    box-shadow: var(--lp-shadow-sm);
    border: 1px solid var(--lp-border-light);
}

.lp-testimonial-content {
    margin-bottom: var(--lp-spacing-md);
}

.lp-testimonial-content p {
    font-size: 0.95rem;
    color: var(--lp-text-secondary);
    line-height: 1.7;
    margin: 0;
}

.lp-testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--lp-spacing-sm);
}

.lp-testimonial-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--lp-primary-light);
    color: var(--lp-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.lp-testimonial-info {
    display: flex;
    flex-direction: column;
}

.lp-testimonial-info strong {
    font-size: 0.9rem;
}

.lp-testimonial-info span {
    font-size: 0.75rem;
    color: var(--lp-text-muted);
}

/* ==================== Security Section ==================== */
.lp-security-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--lp-spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.lp-security-item {
    text-align: center;
    padding: var(--lp-spacing-md);
}

.lp-security-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--lp-primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--lp-spacing-sm);
}

.lp-security-icon i {
    font-size: 1.5rem;
    color: var(--lp-primary);
}

.lp-security-item h4 {
    margin-bottom: var(--lp-spacing-xs);
}

.lp-security-item p {
    font-size: 0.875rem;
    color: var(--lp-text-secondary);
    margin: 0;
}

/* ==================== News Section ==================== */
.lp-news-section {
    background: var(--lp-bg-secondary);
}

.lp-news-list {
    max-width: 900px;
    margin: 0 auto;
}

.lp-news-item {
    display: flex;
    align-items: center;
    gap: var(--lp-spacing-sm);
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--lp-border-light);
}

.lp-news-item:last-child {
    border-bottom: none;
}

.lp-news-date {
    font-size: 0.8rem;
    color: var(--lp-text-muted);
    min-width: 90px;
}

.lp-news-badge {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.2rem 0.5rem;
    border-radius: var(--lp-radius-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lp-news-badge-new {
    background: #ef4444;
    color: white;
}

.lp-news-badge-update {
    background: var(--lp-primary);
    color: white;
}

.lp-news-badge-feature {
    background: #10b981;
    color: white;
}

.lp-news-title {
    font-size: 0.9rem;
    color: var(--lp-text-primary);
    text-decoration: none;
    transition: color var(--lp-transition);
}

.lp-news-title:hover {
    color: var(--lp-primary);
}

/* ==================== Demo Section ==================== */
.lp-demo-split {
    display: flex;
    gap: var(--lp-spacing-xl);
    align-items: stretch;
}

.lp-demo-left {
    flex: 1.2;
    min-width: 0;
}

.lp-demo-right {
    flex: 0.8;
    background: var(--lp-bg-primary);
    border-radius: var(--lp-radius-xl);
    padding: var(--lp-spacing-xl);
    box-shadow: var(--lp-shadow-md);
    border: 1px solid var(--lp-border);
}

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

.lp-demo-right h4 {
    font-size: 0.875rem;
    color: var(--lp-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin: var(--lp-spacing-md) 0 var(--lp-spacing-sm);
}

/* iframe Wrapper */
.lp-demo-iframe-wrapper {
    border-radius: var(--lp-radius-xl);
    box-shadow: var(--lp-shadow-xl);
    overflow: hidden;
    border: 1px solid var(--lp-border);
    background: var(--lp-bg-primary);
    height: 100%;
}

.lp-demo-iframe {
    width: 100%;
    height: 100%;
    min-height: 500px;
    border: none;
    display: block;
}

/* Steps */
.lp-demo-step {
    display: flex;
    gap: var(--lp-spacing-sm);
    margin-bottom: var(--lp-spacing-sm);
}

.lp-demo-step-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--lp-primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    font-weight: 600;
    flex-shrink: 0;
}

.lp-demo-step-content {
    flex: 1;
}

.lp-demo-step-content strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.lp-demo-step-content p {
    font-size: 0.8rem;
    color: var(--lp-text-secondary);
    margin: 0;
}

/* Shortcuts */
.lp-demo-shortcuts {
    margin-top: var(--lp-spacing-md);
    padding-top: var(--lp-spacing-md);
    border-top: 1px solid var(--lp-border-light);
}

.lp-demo-shortcut-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 0;
    font-size: 0.85rem;
}

.lp-demo-shortcut-item kbd {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    font-family: monospace;
    font-size: 0.7rem;
    background: var(--lp-bg-tertiary);
    border: 1px solid var(--lp-border);
    border-radius: var(--lp-radius-sm);
    min-width: 80px;
    text-align: center;
}

.lp-demo-shortcut-item .material-icons {
    color: var(--lp-text-muted);
}

/* AI List */
.lp-demo-ai-list {
    margin-top: var(--lp-spacing-md);
    padding-top: var(--lp-spacing-md);
    border-top: 1px solid var(--lp-border-light);
}

.lp-demo-ai-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
}

.lp-demo-ai-list li {
    font-size: 0.8rem;
    color: var(--lp-text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.lp-demo-ai-list li i {
    color: var(--lp-primary);
    font-size: 0.875rem;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .lp-navbar-links {
        display: none;
    }

    .lp-hero h1 {
        font-size: 2.25rem;
    }

    .lp-hero p {
        font-size: 1rem;
    }

    .lp-section {
        padding: var(--lp-spacing-2xl) 0;
    }

    h2 {
        font-size: 1.75rem;
    }

    .lp-ai-feature,
    .lp-ai-feature:nth-child(even) {
        flex-direction: column;
    }

    .lp-pricing-card.featured {
        transform: none;
    }

    /* News responsive */
    .lp-news-item {
        flex-wrap: wrap;
    }

    .lp-news-title {
        width: 100%;
        margin-top: 0.25rem;
    }

    /* Demo split responsive */
    .lp-demo-split {
        flex-direction: column;
    }

    .lp-demo-left,
    .lp-demo-right {
        flex: none;
        width: 100%;
    }

    .lp-demo-iframe {
        min-height: 350px;
    }

    .lp-demo-right {
        padding: var(--lp-spacing-md);
    }

    .lp-demo-ai-list ul {
        grid-template-columns: 1fr;
    }
}