:root {
    --primary: #4F46E5;
    --primary-hover: #4338ca;
    --text-main: #111111;
    --text-secondary: #666666;
    --bg-body: #FFFFFF;
    --bg-light: #F9FAFB;
    --border: #E5E7EB;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Noto Sans JP', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    margin: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Header */
header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: block;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
    text-decoration: none;
    color: var(--text-main);
}

.tagline {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* H1 - Hidden for SEO usually, but used as main title in pages */
h1.visually-hidden {
    font-size: 1px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    position: absolute;
    opacity: 0;
}

/* Link Styles */
a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.back-link {
    display: inline-block;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.back-link:hover {
    color: var(--primary);
}