@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

:root {
    --primary-color: #6c63ff;
    --secondary-color: #4CAF50;
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --card-background: rgba(255, 255, 255, 0.1);
    --gradient-start: #6c63ff;
    --gradient-end: #ff6b6b;
}

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

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

/* Navigation */
.glass-nav {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-sizing: border-box;
}

.glass-nav > .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-right: 1rem;
}

.logo-text {
    color: #fff;
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: bold;
    transition: color 0.3s ease;
}

.logo-text:hover {
    color: #4ecdc4;
}

nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin-left: 1.5rem;
}

nav ul li a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.hero-content {
    max-width: 800px;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Glass Card Effect */
.glass-card {
    background: var(--card-background);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* Neo Button */
.neo-button {
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    border: none;
    color: white;
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1rem;
    transition: transform 0.3s ease;
    text-decoration: none;
    display: inline-block;
    margin-top: 1rem;
}

.neo-button:hover {
    transform: translateY(-3px);
}

/* Features Section */
.features {
    padding: 4rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    padding: 2rem;
}

.feature-card {
    text-align: center;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

/* Social Section */
.social-section {
    padding: 4rem 0;
}

.social-container {
    max-width: 600px;
    margin: 0 auto;
}

#tweet-container {
    display: flex;
    justify-content: center;
}

/* Book Section */
.book-section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 2rem;
    background: linear-gradient(45deg, var(--gradient-start), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.book-card {
    padding: 2rem;
}

.book-info {
    display: flex;
    align-items: flex-start;
    gap: 2rem;
}

.book-cover {
    max-width: 200px;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.book-cover:hover {
    transform: scale(1.05);
}

.book-details {
    flex: 1;
}

.book-details h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.book-details p {
    margin-bottom: 0.5rem;
    color: #ccc;
}

/* Responsive Design */
@media (max-width: 768px) {
    .glass-nav {
        padding: 0.5rem;
    }

    .glass-nav > .container {
        flex-direction: column;
        padding: 0 0.5rem;
    }

    .logo {
        margin-bottom: 0.5rem;
        margin-right: 0;
        font-size: 1.3rem;
    }

    nav {
        width: 100%;
    }

    nav ul {
        display: flex;
        justify-content: space-between;
        width: 100%;
        flex-wrap: nowrap;
        gap: 0.5rem;
    }

    nav ul li {
        margin: 0;
        white-space: nowrap;
    }

    nav ul li a {
        font-size: 0.9rem;
        padding: 0.5rem 0.25rem;
        display: block;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .book-info {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .book-cover {
        margin-bottom: 1rem;
    }
}

/* Extra Small Devices */
@media (max-width: 480px) {
    .glass-nav {
        padding: 0.4rem;
    }

    .glass-nav > .container {
        padding: 0 0.3rem;
    }

    .logo {
        font-size: 1.1rem;
        margin-bottom: 0.4rem;
    }

    nav ul {
        gap: 0.2rem;
    }

    nav ul li a {
        font-size: 0.8rem;
        padding: 0.4rem 0.2rem;
    }

    .hero {
        padding: 1rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .glass-card {
        padding: 1.5rem;
    }
}

/* Ultra Small Devices */
@media (max-width: 360px) {
    .logo {
        font-size: 1rem;
    }

    nav ul li a {
        font-size: 0.75rem;
        padding: 0.3rem 0.15rem;
    }

    .hero h1 {
        font-size: 1.6rem;
    }
}

.gradient-text {
    background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-align: center;
    margin-bottom: 1rem;
}

.button-container {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}

.text-center {
    text-align: center;
    margin-bottom: 1rem;
}