:root {
    --primary-color: #F09461;
    --secondary-color: #6c757d;
    --accent-color: #F9C482;
    --background-color: #ffffff;
    --light-gray-bg: #F0F0F0;
    --text-color: #343a40;
    --light-text-color: #6c757d;
    --border-color: #dee2e6;
    --font-family: 'Noto Sans JP', sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-family);
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0; padding: 0;
    line-height: 1.8;
    font-size: 16px;
}
.lp-container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* 共通 */
.section-title { text-align: center; font-size: 38px; font-weight: 900; margin-top: 0; margin-bottom: 60px; line-height: 1.5; }
.section-title span { display: block; font-size: 18px; font-weight: 500; color: var(--primary-color); margin-bottom: 10px; }
.text-gradient { background: linear-gradient(45deg, var(--primary-color), var(--accent-color)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.btn { display: inline-block; padding: 12px 28px; border-radius: 8px; text-decoration: none; font-weight: 700; transition: all 0.2s; border: 2px solid transparent; }
.btn-primary { background-color: var(--primary-color); color: #fff; }
.btn-primary:hover { background-color: #d87e4c; box-shadow: 0 4px 15px rgba(240, 148, 97, 0.4); transform: translateY(-2px); }
.btn-login { border-color: var(--border-color); color: var(--text-color); }
.btn-login:hover { background-color: #F0F0F0; }
.btn-large { padding: 18px 40px; font-size: 18px; }
.btn-default { background-color: #fff; color: var(--primary-color); border-color: var(--primary-color); }
.btn-default:hover { background-color: #fff8f2; }

/* Header */
.lp-header { background-color: rgba(255, 255, 255, 0.85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); padding: 15px 0; position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid #f0f0f0; }
.lp-header .lp-container { display: flex; justify-content: space-between; align-items: center; }
.lp-header .logo { font-size: 24px; font-weight: 900; color: var(--primary-color); }
.lp-nav a { margin: 0 15px; font-weight: 500; color: var(--light-text-color); }
.lp-header-actions { display: flex; gap: 10px; }

/* Hero Section */
.hero { text-align: center; padding: 80px 0; }
.hero h1 { font-size: 46px; font-weight: 900; line-height: 1.5; margin-top: 0; margin-bottom: 20px; }
.hero .subtitle { font-size: 18px; max-width: 700px; margin: 0 auto 40px; color: var(--light-text-color); }
.hero-image { margin-top: 50px; }
.hero-image img { max-width: 100%; border-radius: 12px; box-shadow: 0 15px 40px rgba(0,0,0,0.1); }

/* Problem Section */
.problem-section { padding: 100px 0; background-color: var(--light-gray-bg); }
.problem-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 25px; max-width: 900px; margin: 0 auto; }
.problem-item { background-color: #fff; border-left: 5px solid var(--accent-color); padding: 20px 25px; border-radius: 8px; font-weight: 500; box-shadow: 0 4px 15px rgba(0,0,0,0.03); }

/* Solution Section */
.solution-section { padding: 80px 0; text-align: center; }
.solution-section .section-title { margin-bottom: 20px; }
.solution-subtitle { max-width: 700px; margin: 0 auto; font-size: 20px; color: var(--light-text-color); }

/* Features Section */
.features { padding: 100px 0; }
.feature-card { display: flex; align-items: center; gap: 40px; margin-bottom: 80px; }
.feature-card:last-child { margin-bottom: 0; }
.feature-icon-wrapper { flex-shrink: 0; }
.feature-icon-wrapper img { width: 100px; height: 100px; border-radius: 50%; }
.feature-text h3 { font-size: 24px; margin-top: 0; margin-bottom: 15px; display: flex; align-items: center; }
.feature-text p { font-size: 17px; }

/* Use Cases Section */
.use-cases { padding: 100px 0; background-color: var(--light-gray-bg); }
.use-cases .section-subtitle { text-align: center; max-width: 800px; margin: -40px auto 60px; font-size: 18px; color: var(--light-text-color); }
.use-case-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; }
.use-case-item { background-color: #fff; border-radius: 8px; padding: 30px; border-top: 5px solid var(--primary-color); box-shadow: 0 4px 15px rgba(0,0,0,0.05); }
.use-case-title { font-size: 20px; margin: 10px 0 15px 0; }
.use-case-examples { font-size: 15px; color: var(--light-text-color); margin: 0; }

/* Flow Section */
.flow { padding: 100px 0; }
.flow-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; text-align: center; }
.step-icon img { width: 80px; height: 80px; margin: 0 auto 20px; }
.step-title { font-size: 20px; }

/* --- Pricing Section --- */
.pricing { padding: 100px 0; background-color: var(--light-gray-bg); }
.plan-selection-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; align-items: stretch; }
.plan-card {
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    transition: all 0.2s;
    background-color: #fff;
    text-align: left;
}
.plan-card.featured {
    border-color: var(--primary-color);
    border-width: 2px;
    box-shadow: 0 10px 30px -10px rgba(240, 148, 97, 0.5);
    position: relative;
}
.featured-badge {
    position: absolute;
    top: -15px;
    left: 20px;
    background-color: var(--primary-color);
    color: #fff;
    padding: 6px 15px;
    border-radius: 15px;
    font-size: 13px;
    font-weight: 700;
}
.plan-name { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.plan-price { font-size: 42px; font-weight: 900; color: var(--text-color); margin: 15px 0; }
.plan-price span { font-size: 16px; font-weight: 500; color: var(--light-text-color); }
.plan-features { list-style: none; padding: 0; margin: 20px 0 30px; color: #333; flex-grow: 1; border-top: 1px solid var(--border-color); padding-top: 20px;}
.plan-features li { margin-bottom: 12px; font-size: 15px; display: flex; align-items: center; }
.check-icon { color: var(--primary-color); margin-right: 10px; font-weight: bold; }
.plan-card .btn { width: 100%; text-align: center; }
.btn-outline { background-color: #fff; color: var(--primary-color); border-color: var(--border-color); }
.btn-outline:hover { background-color: #f7faff; border-color: var(--primary-color); }
.pricing-notes { text-align: center; margin-top: 30px; font-size: 14px; color: var(--light-text-color); }

/* Security Section */
.security { padding: 100px 0; text-align: center; }
.security .lp-container { max-width: 800px; }
.security-text { font-size: 17px; }

/* FAQ Section */
.faq { padding: 100px 0; background-color: var(--light-gray-bg); }
.faq .lp-container { max-width: 800px; }
.faq-item { border-bottom: 1px solid var(--border-color); }
.faq-question { font-size: 18px; font-weight: 500; padding: 20px 0; cursor: pointer; position: relative; margin: 0; }
.faq-question::after { content: '+'; position: absolute; right: 0; transition: transform 0.2s; font-size: 24px; color: var(--primary-color); }
.faq-question.active::after { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.3s ease-in-out; }
.faq-answer p { padding-bottom: 20px; margin: 0; color: var(--light-text-color); }

/* Footer */
.lp-footer { background-color: #343a40; color: #adb5bd; padding: 40px 0; text-align: center; }
.lp-footer nav { margin-bottom: 15px; }
.lp-footer nav a { color: #fff; margin: 0 10px; }
.lp-footer p { margin: 0; font-size: 13px; }

/* Responsive */
@media (max-width: 991px) { .lp-nav { display: none; } }
@media (max-width: 767px) {
    .lp-header-actions { display: none; }
    .hero h1 { font-size: 32px; }
    .section-title { font-size: 28px; }
    .problem-grid, .flow-steps, .use-case-grid { grid-template-columns: 1fr; }
    .feature-card { flex-direction: column !important; text-align: center; }
}

/* --- Contact Section --- */
.contact-section { padding: 100px 0; background-color: var(--light-gray-bg); }
.contact-container {
    max-width: 700px;
    margin: 0 auto;
    background-color: #fff;
    padding: 40px 50px;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.08);
}
.contact-header { text-align: center; margin-bottom: 40px; }
.contact-header .icon {
    font-size: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 92px;
    height: 92px;
    background-color: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    line-height: 1;
    margin-bottom: 20px;
}
.contact-header .section-title { margin-bottom: 10px; }

/* フォーム共通スタイル */
.form-group { margin-bottom: 25px; }
.form-group label { display: block; font-weight: 500; margin-bottom: 8px; }
.form-control { width: 100%; padding: 12px; font-size: 16px; border: 1px solid var(--border-color); border-radius: 8px; }
textarea.form-control { resize: vertical; min-height: 120px; }
.radio-group label { display: flex; align-items: center; margin-bottom: 12px; cursor: pointer; }
.radio-group input { margin-right: 10px; width: 18px; height: 18px; }
.required { color: #dc3545; font-size: 12px; margin-left: 5px; }
.form-actions { text-align: center; margin-top: 30px; }
.alert { padding: 15px; margin-bottom: 20px; border-radius: 4px; border: 1px solid transparent; }
.alert-success { background-color: #d4edda; color: #155724; border-color: #c3e6cb; }
.alert-danger { background-color: #f8d7da; color: #721c24; border-color: #f5c6cb; }
.alert-danger ul { padding-left: 20px; margin: 0; }