/* ============================================
   7sapiens — Design System
   Brand: "Dig Deeper"
   Palette: B (High Contrast / Ivory Base)
   ============================================ */

/* --- Design Tokens --- */
:root {
    /* Colors - Palette B */
    --color-bg: #FAF6F0;
    --color-text-primary: #2C2418;
    --color-text-secondary: #4A3C2E;
    --color-accent: #8B7355;
    --color-card-bg: #F0E8DA;
    --color-border: #D4C5A9;
    --color-badge-bg: #5D4E37;
    --color-badge-text: #FAF6F0;
    --color-logo-bg: #5D4E37;
    --color-logo-text: #D4C5A9;

    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Noto Sans JP', sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    --font-size-base: 16px;

    /* Spacing */
    --spacing-unit: 8px;
    --radius: 8px;
    --max-width: 720px;

    /* Transitions */
    --transition-base: 0.2s ease;
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    font-weight: var(--font-weight-light);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: 1.8;
    position: relative;
    min-height: 100vh;
}

/* --- Paper Texture Overlay --- */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    pointer-events: none;
    opacity: 0.04;
    z-index: 0;
}

/* --- Layout Container --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 calc(var(--spacing-unit) * 3);
    position: relative;
    z-index: 1;
}

/* --- Header --- */
.site-header {
    text-align: center;
    padding: calc(var(--spacing-unit) * 8) 0 calc(var(--spacing-unit) * 6);
}

.logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--color-logo-bg);
    color: var(--color-logo-text);
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 1.75rem;
    letter-spacing: 0.05em;
    margin-bottom: calc(var(--spacing-unit) * 2);
    text-decoration: none;
}

.site-title {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 2rem;
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 0.5);
    letter-spacing: 0.02em;
}

.site-subtitle {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 0.875rem;
    color: var(--color-accent);
    letter-spacing: 0.25em;
    text-transform: uppercase;
}

/* --- Intro Section --- */
.intro {
    text-align: center;
    padding: calc(var(--spacing-unit) * 4) 0;
    border-bottom: 1px solid var(--color-border);
}

.intro .catchcopy {
    font-family: var(--font-body);
    font-weight: var(--font-weight-regular);
    font-size: 1.125rem;
    line-height: 2;
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 3);
}

.intro .bio {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* --- Apps Section --- */
.apps-section {
    padding: calc(var(--spacing-unit) * 5) 0;
}

.section-title {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 1rem;
    color: var(--color-accent);
    text-align: center;
    letter-spacing: 0.2em;
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.section-title::before,
.section-title::after {
    content: '──';
    margin: 0 calc(var(--spacing-unit) * 1.5);
    color: var(--color-border);
}

/* --- App Card --- */
.app-card {
    background-color: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 2.5);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.app-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(93, 78, 55, 0.08);
}

.app-card-header {
    display: flex;
    align-items: center;
    gap: calc(var(--spacing-unit) * 1.5);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.app-icon {
    font-size: 1.75rem;
    flex-shrink: 0;
}

.app-name {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 1.125rem;
    color: var(--color-text-primary);
}

.app-tagline {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: 2px;
}

.app-description {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

/* --- Badges --- */
.badges {
    display: flex;
    flex-wrap: wrap;
    gap: calc(var(--spacing-unit) * 0.75);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.badge {
    display: inline-block;
    background-color: var(--color-badge-bg);
    color: var(--color-badge-text);
    font-size: 0.6875rem;
    font-weight: var(--font-weight-medium);
    padding: 2px 10px;
    border-radius: 100px;
    letter-spacing: 0.02em;
}

/* --- Store Link --- */
.store-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8125rem;
    color: var(--color-accent);
    text-decoration: none;
    font-weight: var(--font-weight-regular);
    transition: color var(--transition-base);
}

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

/* --- Footer --- */
.site-footer {
    text-align: center;
    padding: calc(var(--spacing-unit) * 5) 0 calc(var(--spacing-unit) * 4);
    border-top: 1px solid var(--color-border);
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: calc(var(--spacing-unit) * 3);
    margin-bottom: calc(var(--spacing-unit) * 2);
    list-style: none;
}

.footer-links a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.copyright {
    color: var(--color-border);
    font-size: 0.75rem;
}

/* --- Privacy Policy Page --- */
.privacy-header {
    padding: calc(var(--spacing-unit) * 4) 0 calc(var(--spacing-unit) * 2);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.875rem;
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

.privacy-content {
    padding: calc(var(--spacing-unit) * 2) 0 calc(var(--spacing-unit) * 6);
}

.privacy-content h1 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    color: var(--color-text-primary);
    margin-bottom: calc(var(--spacing-unit) * 1);
}

.privacy-content .last-updated {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-bottom: calc(var(--spacing-unit) * 4);
}

.privacy-content h2 {
    font-family: var(--font-heading);
    font-weight: var(--font-weight-bold);
    font-size: 1.125rem;
    color: var(--color-text-primary);
    margin-top: calc(var(--spacing-unit) * 4);
    margin-bottom: calc(var(--spacing-unit) * 1.5);
}

.privacy-content p,
.privacy-content ul {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: calc(var(--spacing-unit) * 2);
}

.privacy-content ul {
    padding-left: calc(var(--spacing-unit) * 2.5);
}

.privacy-content li {
    margin-bottom: calc(var(--spacing-unit) * 0.75);
}

/* --- Responsive (Mobile: <= 480px) --- */
@media (max-width: 480px) {
    .container {
        padding: 0 calc(var(--spacing-unit) * 2);
    }

    .site-header {
        padding: calc(var(--spacing-unit) * 5) 0 calc(var(--spacing-unit) * 4);
    }

    .logo {
        width: 64px;
        height: 64px;
        font-size: 1.5rem;
    }

    .site-title {
        font-size: 1.625rem;
    }

    .section-title::before,
    .section-title::after {
        content: '─';
        margin: 0 calc(var(--spacing-unit) * 1);
    }

    .app-card {
        padding: calc(var(--spacing-unit) * 2.5);
    }

    .app-icon {
        font-size: 1.5rem;
    }

    .app-name {
        font-size: 1rem;
    }

    .footer-links {
        flex-direction: column;
        gap: calc(var(--spacing-unit) * 1.5);
    }

    .privacy-content h1 {
        font-size: 1.25rem;
    }
}