:root {
    --color-background: #FFFFF8;
    --color-text: #1A1A2F;
    --font-family: 'Noto Sans', sans-serif;
    --code-background: #f6f8fa;
    --code-border: #e1e4e8;
}

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

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-background);
    line-height: 1.8;
    overflow-x: hidden;
    overflow-y: auto;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 0.5rem;
    padding-top: 6rem;
    font-size: 0.9rem;
}

#canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    opacity: 0.1;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 248, 0.95);
    backdrop-filter: blur(5px);
    transition: all 0.3s ease;
    height: 6rem;
    display: flex;
    align-items: center;
    justify-content: space-between; /* Added */
    padding-left: 2.5rem;
    padding-right: 2.5rem; /* Added for symmetry */
}

header.scrolled {
    height: 4rem;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    font-family: 'Lora', serif;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    transition: all 0.3s ease;
}

.company-name {
    font-family: 'Lora', serif;
    font-size: 0.8rem;
    color: rgba(26, 26, 47, 0.8); /* Increased opacity for better visibility */
    transition: all 0.2s ease;
}

header.scrolled .logo {
    font-size: 1.2rem;
}

header.scrolled .company-name {
    font-size: 0.8rem;
}

main {
    position: relative;
    max-width: 45em;
    margin: 0 auto;
    padding: 0 1em;
    flex: 1;
}

p {
    margin: 1.5em 0;
    background-color: rgba(255, 255, 248, 0.8);
    border-radius: 2px;
    text-align: left;
}

h2 {
    margin: 2em 0 1em;
    font-weight: 700;
}

h3 {
    margin: 1.5em 0 0.5em;
    font-weight: 700;
}

.code-block {
    font-family: 'Fira Code', monospace;
    background-color: var(--code-background);
    border-radius: 6px;
    padding: 1em;
    margin: 1em 0;
    overflow-x: auto;
    white-space: pre;
    font-size: 0.9em;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.output {
    border-left: 4px solid #646479;
    padding: 1em;
    padding-left: 2em;
    margin: 1em 0;
    background-color: #f6f8fa;
    font-style: italic;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

footer {
    text-align: center;
    padding: 1em;
    font-size: 0.8em;
    color: rgba(26, 26, 47, 0.6); /* Increased opacity */
    background-color: rgba(255, 255, 248, 0.8);
}

a {
    color: gray;
    text-decoration: none; /* 下線を消す場合（必要に応じて） */
}

a:hover {
    text-decoration: underline; /* ホバー時の下線（必要に応じて） */
}

/* Responsive Styles */

/* Mobile Devices (width ≤ 768px) */
@media (max-width: 768px) {
    body {
        padding-top: 5rem;
    }

    header {
        height: 5rem;
        padding-left: 1.5rem;
        padding-right: 1.5rem;
    }

    header.scrolled {
        height: 3.5rem;
    }

    .logo {
        font-size: 1.5rem;
    }

    .company-name {
        font-size: 0.7rem;
    }

    main {
        max-width: 100%;
        padding: 0 0.5em;
    }

    h2 {
        font-size: 1.5rem;
    }

    p, li {
        font-size: 0.85rem;
    }

    .code-block {
        font-size: 0.8rem;
        padding: 0.8em;
    }

    .output {
        font-size: 0.9rem;
    }

    footer {
        font-size: 0.7em;
        padding: 0.8em;
    }

    .logo-container {
        flex-direction: column;
        align-items: flex-start;
    }
}

/* Extra Small Devices (width ≤ 480px) */
@media (max-width: 480px) {
    header {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .logo {
        font-size: 1.2rem;
    }

    .company-name {
        display: none;
    }

    h2 {
        font-size: 1.3rem;
    }

    p, li {
        font-size: 0.8rem;
    }

    .code-block {
        font-size: 0.7rem;
        padding: 0.6em;
    }

    .output {
        font-size: 0.8rem;
    }

    footer {
        font-size: 0.6em;
        padding: 0.6em;
    }
}

/* Make images responsive */
img {
    max-width: 100%;
    height: auto;
}

/* Ensure tables are responsive */
table {
    width: 100%;
    overflow-x: auto;
    display: block;
}