:root {
    --primary-color: #3498db;
    --secondary-color: #2c3e50;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --light-gray: #ecf0f1;
    --white: #ffffff;
    --max-width: 1000px;
}

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

body {
    font-family: 'Helvetica Neue', Arial, 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background-color: var(--white);
    padding: 1.5rem 0;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--secondary-color);
    text-decoration: none;
}

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

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

/* Hero Section */
.hero {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
}

/* Sections */
section {
    padding: 4rem 0;
}

section h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--secondary-color);
}

/* App Grid */
.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.app-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    text-align: center;
    transition: transform 0.3s ease;
}

.app-card:hover {
    transform: translateY(-5px);
}

.app-card h3 {
    margin-bottom: 1rem;
}

.app-card p {
    color: #666;
    margin-bottom: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 30px;
    font-weight: bold;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2980b9;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

footer p {
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.footer-links a {
    color: #bdc3c7;
    text-decoration: none;
    margin: 0 10px;
    font-size: 0.9rem;
}

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

/* Content Pages (Privacy, Terms) */
.content-wrapper {
    background-color: var(--white);
    padding: 3rem;
    margin: 2rem auto;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.content-wrapper h1 {
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.content-wrapper h2 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    text-align: left;
    font-size: 1.5rem;
}

.content-wrapper ul {
    margin-left: 20px;
    margin-bottom: 1rem;
}

.content-wrapper p {
    margin-bottom: 1rem;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    .content-wrapper {
        padding: 1.5rem;
    }
}