/* ====================================
   共通CSS - Variables & Reset
   ==================================== */
:root {
    /* Colors - Dark Mode (ホームページ用) */
    --color-bg-primary: #1a1a1a;
    --color-bg-secondary: #242424;
    --color-bg-card: #2a2a2a;
    --color-border: #3a3a3a;
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a8a8a8;
    --color-accent: #b8956a;
    --color-accent-hover: #d4b584;

    /* Colors - Light Mode (サブページ用) */
    --color-white: #ffffff;
    --color-black: #111;

    /* サブページ共通（部品ベース） */
    --color-page-text: #e8e8e8;
    --color-page-text-secondary: #b8956a;
    --color-page-border: #b8956a;
    --color-page-border-emphasis: #333;
    --color-content-text: #e8e8e8;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 0.75rem;
    --spacing-lg: 1rem;
    --spacing-xl: 1.5rem;

    /* Typography */
    --font-sans: 'Noto Sans JP', sans-serif;
    --font-serif: 'Noto Serif JP', serif;
    --font-script: 'Yuji Mai', serif;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 4px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 4px 8px rgba(0, 0, 0, 0.5);
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-accent: rgba(184, 149, 106, 0.3);

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
}

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

html {
    font-size: 14px;
    height: 100%;
}

body {
    font-family: var(--font-sans);
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    color: var(--color-text-primary);
    height: 100%;
    line-height: 1.4;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ====================================
   Layout Container
   ==================================== */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xs);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    gap: var(--spacing-md);
}

/* ====================================
   Footer (共通)
   ==================================== */
.footer {
    text-align: center;
    padding: var(--spacing-sm) 0 0;
    flex-shrink: 0;
}

.footer-text {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    font-weight: 300;
}

/* ====================================
   サブページ共通ヘッダー
   ==================================== */
.page-header {
    padding: var(--spacing-md) 0;
    margin-bottom: 0;
    border-bottom: 2px solid var(--color-page-border);
}

.header-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    justify-content: flex-start;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.logo-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    text-decoration: none;
    transition: opacity var(--transition-fast);
}

.logo-link:hover {
    opacity: 0.8;
}

.logo-small {
    width: 50px;
    height: 50px;
    object-fit: contain;
    border-radius: 50%;
    border: 1px solid var(--color-accent);
    padding: 4px;
    background: var(--color-bg-card);
}

.site-info {
    text-align: left;
}

.site-name {
    font-family: var(--font-script);
    font-size: 1.2rem;
    font-weight: 700;
    margin: 0;
    color: var(--color-page-text);
}

.site-label {
    font-size: 0.7rem;
    color: var(--color-accent);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

/* ====================================
   サブページ共通タイトル
   ==================================== */
.page-title-section {
    text-align: center;
    margin: var(--spacing-xl) auto var(--spacing-lg) auto;
    max-width: 600px;
}

.page-title {
    font-family: var(--font-script);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--color-page-text);
    margin-bottom: var(--spacing-xs);
}

.page-subtitle {
    font-size: 0.9rem;
    color: var(--color-page-text-secondary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

/* ====================================
   ホームボタン（共通）
   ==================================== */
.home-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    color: #fff;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 500;
    transition: all var(--transition-medium);
    box-shadow: 0 2px 8px rgba(184, 149, 106, 0.3);
    margin-bottom: var(--spacing-md);
}

.home-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(184, 149, 106, 0.4);
}

/* ====================================
   Animations (共通)
   ==================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ====================================
   Responsive Design (共通)
   ==================================== */
@media (min-width: 600px) {
    html {
        font-size: 16px;
    }

    .container {
        padding: var(--spacing-lg);
        max-width: 1000px;
    }

    .footer {
        padding-top: var(--spacing-lg);
    }
}