:root {
    --primary: #4CAF50; /* yomijiカラーの緑に変更 */
    --primary-dark: #388E3C;
    --bg-dark: #080C09; /* アプリの背景色に合わせる */
    --bg-card: #121613;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    background-color: rgba(8, 12, 9, 0.9);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 800;
    font-size: 1.3rem;
    letter-spacing: -0.5px;
}

.logo img {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

nav a {
    color: var(--text-main);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 600;
    font-size: 0.9rem;
    transition: color 0.3s;
}

nav a:hover {
    color: var(--primary);
}

.btn {
    background-color: var(--primary);
    color: #000; /* 緑背景には黒文字が映える */
    padding: 0.6rem 1.5rem;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 700;
    transition: transform 0.2s, background 0.3s, box-shadow 0.3s;
    display: inline-block;
}

.btn:hover {
    transform: translateY(-2px);
    background-color: #66BB6A;
    box-shadow: 0 4px 20px rgba(76, 175, 80, 0.4);
}

.btn-large {
    padding: 1.2rem 3rem;
    font-size: 1.1rem;
    border-radius: 40px;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #000;
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10rem 5% 6rem;
    min-height: 90vh;
    max-width: 1200px;
    margin: 0 auto;
}

.hero-content {
    flex: 1.2;
    padding-right: 4rem;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 2rem;
    font-weight: 800;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 500px;
}

.hero-image {
    flex: 0.8;
    display: flex;
    justify-content: center;
    position: relative;
}

.screenshot-mockup {
    max-width: 320px;
    border-radius: 48px;
    border: 12px solid #1e293b;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.8), 0 0 80px rgba(76, 175, 80, 0.15);
}

/* Features List */
.features {
    padding: 8rem 5%;
    max-width: 1100px;
    margin: 0 auto;
}

.features h2 {
    font-size: 3rem;
    text-align: center;
    margin-bottom: 6rem;
    font-weight: 800;
}

.feature-grid {
    display: flex;
    flex-direction: column;
    gap: 10rem;
}

.feature-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
}

.feature-item.reverse {
    flex-direction: row-reverse;
}

.feature-text {
    flex: 1;
}

.feature-text h3 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--primary);
}

.feature-text p {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.8;
}

.feature-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.feature-visual img {
    max-width: 100%;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.05);
}

/* Premium */
.premium {
    padding: 8rem 5%;
    background: radial-gradient(circle at center, #121613, #080C09);
    text-align: center;
}

.premium-content {
    max-width: 700px;
    margin: 0 auto;
    background-color: #121613;
    padding: 4rem;
    border-radius: 32px;
    border: 1px solid rgba(76, 175, 80, 0.2);
    box-shadow: 0 40px 80px rgba(0,0,0,0.5);
}

.premium h2 {
    font-size: 2.5rem;
    color: var(--primary);
    margin-bottom: 1.5rem;
}

.premium p {
    margin-bottom: 3rem;
    color: var(--text-muted);
}

.premium ul {
    text-align: left;
    list-style: none;
    margin-bottom: 3rem;
}

.premium ul li {
    margin-bottom: 1.2rem;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Download CTA */
.download-cta {
    padding: 10rem 5%;
    text-align: center;
}

.download-cta h2 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.download-cta p {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
}

/* Footer */
footer {
    padding: 5rem 5%;
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.footer-links {
    margin-top: 2rem;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    margin: 0 1.5rem;
    font-size: 0.9rem;
}

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

@media (max-width: 968px) {
    .hero {
        flex-direction: column;
        text-align: center;
        padding-top: 8rem;
    }
    .hero-content {
        padding-right: 0;
        margin-bottom: 4rem;
    }
    .hero h1 {
        font-size: 3rem;
    }
    .hero p {
        margin: 0 auto 3rem;
    }
    .feature-item, .feature-item.reverse {
        flex-direction: column;
        text-align: center;
        gap: 2rem;
    }
    .features h2 {
        font-size: 2.2rem;
    }
}