/* Montessori DIY - Premium Design System */

:root {
    /* Color Palette */
    --color-bg: #FFFFFF;
    /* Main Background: White */
    --color-text: #4A4A4A;
    /* Main Text: Soft Gray */
    --color-text-light: #888888;
    /* Muted Text */
    --color-accent: #C19A6B;
    /* Accent: Camel (Wood/Leather) */
    --color-accent-dark: #A07F55;
    --color-border: #EEEEEE;
    /* Soft Borders */

    /* Typography */
    /* Yu Mincho, Noto Serif JP for intellectual/premium feel */
    --font-base: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "HGSMinchoE", "Meiryo", "Noto Serif JP", serif;
    --font-heading: "Yu Mincho", "YuMincho", "Hiragino Mincho ProN", "HGSMinchoE", "Meiryo", "Noto Serif JP", serif;

    /* Spacing & Layout */
    --spacing-xs: 0.5rem;
    /* 8px */
    --spacing-sm: 1rem;
    /* 16px */
    --spacing-md: 2rem;
    /* 32px */
    --spacing-lg: 4rem;
    /* 64px */
    --spacing-xl: 8rem;
    /* 128px - More whitespace */

    --container-width: 1000px;
    /* Focus on content, not too wide */

    /* Transitions */
    --transition: all 0.4s ease;
}

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

body {
    font-family: var(--font-base);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 2.0;
    /* Loose line height for readability */
    letter-spacing: 0.05em;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    color: var(--color-text);
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: var(--spacing-sm);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Layout Utilities */
.container {
    width: 90%;
    max-width: var(--container-width);
    margin: 0 auto;
}

.section-block {
    padding: var(--spacing-lg) 0;
}

.text-center {
    text-align: center;
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

/* Header & Nav */
.site-header {
    background-color: var(--color-bg);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    font-size: 1.4rem;
    font-weight: bold;
    color: var(--color-text);
    letter-spacing: 0.1em;
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-md);
}

.main-nav a {
    font-size: 0.95rem;
    color: var(--color-text);
    position: relative;
    padding-bottom: 4px;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-accent);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--color-accent);
    transition: var(--transition);
}

.main-nav a:hover::after {
    width: 100%;
}

.menu-toggle {
    display: none;
    /* Mobile handling later */
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.1em;
    font-weight: normal;
}

.hero p {
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    line-height: 2.2;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 1rem 3rem;
    background-color: var(--color-accent);
    color: #FFF;
    font-size: 1rem;
    border-radius: 2px;
    /* Slight round, mostly sharp */
    letter-spacing: 0.1em;
}

.btn:hover {
    background-color: var(--color-accent-dark);
    opacity: 0.9;
}

/* Navigation Banners (Top Page) */
.nav-banners {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.nav-banner {
    position: relative;
    height: 300px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #F9F9F9;
    /* Fallback */
    border: 1px solid var(--color-border);
}

.nav-banner h3 {
    z-index: 2;
    background: rgba(255, 255, 255, 0.9);
    padding: 1rem 2rem;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    min-width: 200px;
    text-align: center;
}

/* Articles / Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg) var(--spacing-md);
}

.article-card {
    display: block;
    transition: opacity 0.3s ease;
    /* For filtering */
}

.article-image {
    width: 100%;
    aspect-ratio: 1 / 1;
    /* Square photos */
    background-color: #F0F0F0;
    margin-bottom: var(--spacing-sm);
    object-fit: cover;
}

.article-card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-xs);
    border-bottom: 1px solid transparent;
    display: inline-block;
    transition: border-color 0.3s;
}

.article-card:hover h3 {
    border-bottom-color: var(--color-accent);
}

.article-meta {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* Footer */
.site-footer {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

/* Roadmap Specific */
.roadmap-step {
    border-left: 2px solid var(--color-accent);
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.roadmap-age {
    font-size: 1.2rem;
    color: var(--color-accent);
    font-weight: bold;
    margin-bottom: var(--spacing-xs);
    display: block;
}

/* Shop Kit Button */
.kit-cta {
    background-color: #FDFBF7;
    border: 1px solid var(--color-accent);
    padding: var(--spacing-md);
    text-align: center;
    margin-top: var(--spacing-lg);
}

.kit-cta h4 {
    color: var(--color-accent);
}

/* --- Recipe Detail Specifics --- */

/* Tags */
.meta-tags {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.tag {
    font-size: 0.8rem;
    padding: 0.2rem 0.8rem;
    border-radius: 20px;
    background-color: #F0F0F0;
    color: var(--color-text);
    letter-spacing: 0.05em;
}

.tag.accent {
    background-color: var(--color-accent);
    color: #FFF;
}

/* Note Box (Educational Aim) */
.note-box {
    background-color: #F9F9F9;
    border-left: 3px solid var(--color-accent);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.note-box h3 {
    font-size: 1.1rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.term-annotation {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
    display: block;
}

/* Hybrid Materials */
.material-hybrid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    /* Slight round */
    overflow: hidden;
}

.material-col {
    padding: var(--spacing-md);
}

.material-col.kit {
    background-color: #FDFBF7;
    /* Warm background for Kit */
    border-right: 1px solid var(--color-border);
}

.material-col h3 {
    font-size: 1rem;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--color-accent-dark);
}

/* Beginners Page Concepts */
.concept-section {
    margin-bottom: var(--spacing-xl);
}

.quote-box {
    background-color: #FDFBF7;
    border-left: 4px solid var(--color-accent);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
    color: var(--color-text);
    position: relative;
}

.quote-box::before {
    content: '“';
    font-size: 4rem;
    color: var(--color-accent);
    opacity: 0.2;
    position: absolute;
    top: -1rem;
    left: 0.5rem;
    font-family: serif;
}

.quote-author {
    display: block;
    text-align: right;
    font-size: 0.9rem;
    color: var(--color-text-light);
    margin-top: var(--spacing-sm);
    font-style: normal;
}

.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.concept-card {
    background-color: #FDFBF7;
    padding: var(--spacing-md);
    border-radius: 8px;
    border: 1px solid var(--color-border);
}

.illustration-placeholder {
    background-color: #EAE5DB;
    height: 180px;
    border-radius: 4px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
    font-size: 0.9rem;
    text-align: center;
}

.key-point-box {
    background-color: #FFF;
    border: 2px solid var(--color-accent);
    padding: var(--spacing-md);
    border-radius: 8px;
    margin-bottom: var(--spacing-lg);
}

.key-point-title {
    color: var(--color-accent);
    font-weight: bold;
    display: block;
    margin-bottom: var(--spacing-sm);
    text-align: center;
    font-size: 1.1rem;
}

/* Video Section */
.video-wrapper {
    margin-bottom: var(--spacing-lg);
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%;
    /* 16:9 Aspect Ratio */
    height: 0;
    background-color: #000;
}

.video-container video,
.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.video-caption {
    background-color: #F9F9F9;
    padding: var(--spacing-sm);
    font-size: 0.9rem;
    color: var(--color-text-light);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

/* Step-up / Recovery Nav */
.nav-step-links {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.step-link {
    display: block;
    padding: var(--spacing-md);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    text-align: center;
}

.step-link:hover {
    border-color: var(--color-accent);
    background-color: #FAFAFA;
}

.step-link .label {
    display: block;
    font-size: 0.8rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
}

.step-link h4 {
    font-size: 1.1rem;
    margin-bottom: 0;
}


/* --- Filter UI --- */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.filter-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.filter-label {
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--color-accent);
    margin-right: 0.5rem;
}

.filter-btn {
    background: none;
    border: 1px solid var(--color-border);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-family: var(--font-base);
    font-size: 0.9rem;
    color: var(--color-text);
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    background-color: #F5F5F5;
}

.filter-btn.active {
    background-color: var(--color-accent);
    color: #FFF;
    border-color: var(--color-accent);
}


/* Mobile */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    .nav-banners {
        grid-template-columns: 1fr;
    }

    .main-nav {
        display: none;
    }

    /* Simplified */
    .menu-toggle {
        display: block;
    }

    .material-hybrid {
        grid-template-columns: 1fr;
    }

    /* Stack materials */
    .nav-step-links {
        grid-template-columns: 1fr;
    }

    .u-hidden-mobile {
        display: none !important;
    }

    .filter-bar {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}