* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
    line-height: 1.6;
    color: #333;
}

html {
    scroll-behavior: smooth;
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

section h2 {
    border-bottom: 2px solid #2c3e50;
    padding-bottom: 8px;
    margin-bottom: 16px;
}

.tag-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.tag-list li {
    background: #ecf0f1;
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 14px;
}

footer {
    text-align: center;
    padding: 20px;
    background: #2c3e50;
    color: #fff;
}

.hero {
    background: linear-gradient(rgba(44, 62, 80, 0.8), rgba(74, 111, 165, 0.8)),
                url('https://images.unsplash.com/photo-1560518883-ce09059eeffa?w=1200') center/cover no-repeat;
    color: #fff;
    text-align: center;
    padding: 100px 20px;
}

.hero h1 {
    font-size: 36px;
    margin-bottom: 16px;
}

.hero p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    background: #e67e22;
    color: #fff;
    text-decoration: none;
    padding: 14px 32px;
    border-radius: 6px;
    font-weight: bold;
    transition: background 0.2s;
    border: none;
    cursor: pointer;
    font-family: inherit;
    font-size: 15px;
}

.btn:hover {
    background: #d35400;
}

.problem, .features, .voice, .price, .faq {
    max-width: 900px;
    margin: 0 auto;
    padding: 60px 20px;
    text-align: center;
}

.problem h2, .features h2, .voice h2, .price h2, .faq h2 {
    font-size: 28px;
    margin-bottom: 32px;
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    text-align: left;
}

.feature-item {
    display: flex;
    align-items: baseline;
    gap: 24px;
    padding: 28px 32px;
    background: #fff;
    border-radius: 4px;
    box-shadow: 0 4px 20px rgba(44, 62, 80, 0.1);
}

.feature-item h3 {
    flex: 0 0 180px;
    font-size: 17px;
    color: #2c3e50;
    margin: 0;
}

.feature-item p {
    flex: 1;
    font-size: 14px;
    color: #555;
    margin: 0;
}

@media (max-width: 600px) {
    .feature-item {
        flex-direction: column;
        gap: 8px;
        padding: 24px 20px;
    }

    .feature-item h3 {
        flex: none;
    }
}

.cta {
    background: #2c3e50;
    color: #fff;
    text-align: center;
    padding: 80px 20px;
}

.cta h2 {
    margin-bottom: 24px;
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1000px;
    margin: 0 auto 60px;
}

.logo {
    font-weight: bold;
    font-size: 20px;
}

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: #f9f9f9;
    text-decoration: none;
    font-size: 14px;
    opacity: 0.9;
    transition: opacity 0.2s;
}

.nav-links a:hover {
    opacity: 1;
}

.voice-list {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.voice-item {
    background: #f9f9f9;
    border-radius: 8px;
    padding: 24px;
    flex: 1;
    min-width: 220px;
    text-align: left;
}

.voice-item p {
    margin-bottom: 12px;
    font-style: italic;
}

.voice-item span {
    font-size: 13px;
    color: #888;
}

.flow-list {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.flow-item {
    text-align: left;
    background: #f9f9f9;
    border-radius: 8px;
    padding: 24px 20px;
}

.flow-num {
    display: block;
    font-size: 28px;
    font-weight: 900;
    color: #e67e22;
    margin-bottom: 8px;
}

.flow-item h3 {
    font-size: 15px;
    margin-bottom: 8px;
    color: #2c3e50;
}

.flow-item p {
    font-size: 13px;
    color: #666;
}

.faq-list {
    max-width: 640px;
    margin: 0 auto;
    text-align: left;
}

.faq-item {
    border-bottom: 1px solid #e0e0e0;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: none;
    border: none;
    padding: 20px 4px;
    font-size: 16px;
    font-family: inherit;
    color: #333;
    cursor: pointer;
    text-align: left;
}

.faq-icon {
    font-size: 20px;
    color: #2c3e50;
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item.open .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-item.open .faq-answer {
    max-height: 200px;
}

.faq-answer p {
    padding: 0 4px 20px;
    color: #666;
    font-size: 14px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 200;
    position: relative;
}

.menu-toggle:focus {
    outline: none;
}

.menu-toggle span {
    display: block;
    width: 26px;
    height: 2px;
    background: #fff;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.menu-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.menu-toggle.open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

@media (max-width: 600px) {
    .menu-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        inset: 0;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 36px;
        background: rgba(10, 14, 20, 0.97);
        backdrop-filter: blur(6px);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.35s ease;
        z-index: 150;
    }

    .nav-links.open {
        opacity: 1;
        visibility: visible;
    }

    .nav-links li {
        list-style: none;
    }

    .nav-links a {
        font-size: 22px;
        font-weight: 500;
        letter-spacing: 0.02em;
        color: #fff;
        text-decoration: none;
        position: relative;
        padding-bottom: 6px;
    }

    .nav-links a::after {
        content: "";
        position: absolute;
        left: 50%;
        bottom: 0;
        width: 0;
        height: 1px;
        background: #e67e22;
        transition: width 0.3s ease, left 0.3s ease;
    }

    .nav-links a:active::after {
        width: 100%;
        left: 0;
    }

    .flow-list {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    header {
        padding: 24px 16px;
    }

    main {
        padding: 24px 16px;
    }

    header h1 {
        font-size: 20px;
    }
}