/* ==========================================================================
   SingleCores - Modern Static Website Styles
   ========================================================================== */

/* CSS Custom Properties (Variables)
   ========================================================================== */
:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #10b981;
    --color-accent: #8b5cf6;

    --color-text: #1f2937;
    --color-text-light: #6b7280;
    --color-text-inverse: #ffffff;

    --color-bg: #ffffff;
    --color-bg-alt: #f9fafb;
    --color-bg-dark: #111827;

    --color-border: #e5e7eb;
    --color-border-light: #f3f4f6;

    /* Typography */
    --font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Meiryo", sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;

    --line-height: 1.75;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --container-max-width: 1200px;
    --header-height: 4rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

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

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

a:hover {
    color: var(--color-primary-dark);
}

a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

ul,
ol {
    list-style: none;
}

/* Layout
   ========================================================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* Header
   ========================================================================== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    height: var(--header-height);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
    text-decoration: none;
    display: flex;
    align-items: center;
}

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

.logo-image {
    height: 2.5rem;
    width: auto;
}

.nav-list {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-light);
    padding: var(--spacing-sm) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

/* Hero Banner
   ========================================================================== */
.hero-banner {
    width: 100%;
    background-color: #ffffff;
}

.hero-banner-image {
    width: 100%;
    display: block;
}

/* Section Styles
   ========================================================================== */
.section-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.products {
    padding: var(--spacing-3xl) 0;
}

.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-bg-alt);
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    color: var(--color-text-light);
}

/* Product Grid
   ========================================================================== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

/* Product Card
   ========================================================================== */
.product-card {
    background-color: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.product-image-wrapper {
    aspect-ratio: 4 / 3;
    overflow: hidden;
    background-color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    transition: transform var(--transition-base);
}

.product-card:hover .product-image {
    transform: scale(1.05);
}

.product-image-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, var(--color-border) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.product-image-placeholder.large {
    aspect-ratio: 1;
    max-width: 100%;
}

.placeholder-icon {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-light);
    opacity: 0.5;
}

.product-content {
    padding: var(--spacing-lg);
}

.product-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.product-price {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.product-description {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

/* Buttons
   ========================================================================== */
.btn {
    display: inline-block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    text-align: center;
    text-decoration: none;
    transition: all var(--transition-fast);
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-text-inverse);
}

.btn-large {
    font-size: var(--font-size-base);
    padding: var(--spacing-md) var(--spacing-xl);
}

/* Product Detail Page
   ========================================================================== */
.product-detail {
    padding: var(--spacing-2xl) 0;
}

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

.breadcrumb ol {
    display: flex;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

.breadcrumb li:not(:last-child)::after {
    content: "/";
    margin-left: var(--spacing-sm);
}

.breadcrumb a {
    color: var(--color-text-light);
}

.breadcrumb a:hover {
    color: var(--color-primary);
}

.product-detail-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.product-detail-image {
    background-color: #ffffff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    min-height: 300px;
    border: 1px solid var(--color-border);
}

.product-detail-image .product-image {
    max-width: 100%;
    max-height: 400px;
    width: auto;
    height: auto;
    object-fit: contain;
}

.product-detail-title {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

.product-detail-code {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
}

.product-detail-price {
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.tax-note {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-normal);
    color: var(--color-text-light);
}

.product-detail-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

/* Product Variants */
.product-variants {
    margin-top: var(--spacing-xl);
}

.product-variants h3 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-md);
}

.variant-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

/* Feature List
   ========================================================================== */
.product-features,
.product-specs,
.product-contents,
.product-documents,
.product-usage,
.product-comparison {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

/* Comparison Image */
.comparison-image-wrapper {
    margin: var(--spacing-lg) 0;
    text-align: center;
}

.comparison-image {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    display: block;
    margin: 0 auto;
}

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

.feature-item {
    padding: var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
}

.feature-item h3 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.feature-item p {
    font-size: var(--font-size-sm);
    color: var(--color-text-light);
}

/* Specs List
   ========================================================================== */
.specs-list {
    display: grid;
    gap: var(--spacing-md);
}

.spec-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-sm);
}

.spec-item dt {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
}

.spec-item dd {
    color: var(--color-text-light);
}

/* Pinout Notes
   ========================================================================== */
.pinout-notes {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-md);
}

.pinout-notes h3 {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.pinout-notes .notes-list {
    display: grid;
    gap: var(--spacing-md);
}

.pinout-notes .note-item {
    display: grid;
    gap: var(--spacing-xs);
}

.pinout-notes .note-item dt {
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    font-size: var(--font-size-sm);
}

.pinout-notes .note-item dd {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* Contents List
   ========================================================================== */
.contents-list,
.usage-list {
    display: grid;
    gap: var(--spacing-sm);
}

.contents-list li,
.usage-list li {
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-bg-alt);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
}

.contents-list li::before,
.usage-list li::before {
    content: "・";
    color: var(--color-primary);
    margin-right: var(--spacing-sm);
}

/* Schematic Image
   ========================================================================== */
.product-schematic {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.schematic-image-wrapper {
    background-color: #ffffff;
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    text-align: center;
}

.schematic-image {
    max-width: 100%;
    height: auto;
}

/* Logic Functions Table
   ========================================================================== */
.product-logic-functions {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-2xl);
    border-top: 1px solid var(--color-border);
}

.section-description {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

.logic-table-wrapper {
    overflow-x: auto;
}

.logic-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.logic-table th,
.logic-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
}

.logic-table th {
    background-color: var(--color-bg-alt);
    font-weight: var(--font-weight-bold);
    color: var(--color-text);
}

.logic-table tr:hover {
    background-color: var(--color-bg-alt);
}

.logic-table td:first-child {
    font-weight: var(--font-weight-medium);
    color: var(--color-primary);
}

/* Table Links */
.table-link {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.table-link:hover {
    color: var(--color-primary-dark);
    text-decoration-thickness: 2px;
}

.table-link::after {
    content: " ↗";
    font-size: 0.8em;
}

.logic-table td:last-child {
    font-family: monospace;
}

.overline {
    text-decoration: overline;
}

/* Product Image Gallery
   ========================================================================== */
.product-gallery {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.gallery-main {
    background-color: #ffffff;
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    min-height: 300px;
    border: 1px solid var(--color-border);
}

.gallery-main .product-image {
    max-width: 100%;
    max-height: 400px;
    width: auto;
    height: auto;
    object-fit: contain;
}

.gallery-thumbnails {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.gallery-thumbnail {
    width: 80px;
    height: 80px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    background-color: #ffffff;
    padding: var(--spacing-xs);
    transition: border-color var(--transition-fast);
}

.gallery-thumbnail:hover {
    border-color: var(--color-primary-light);
}

.gallery-thumbnail.active {
    border-color: var(--color-primary);
}

.gallery-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

/* Documents List
   ========================================================================== */
.documents-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.documents-list li a {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    background-color: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
}

.documents-list li a:hover {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
    border-color: var(--color-primary);
}

/* Footer
   ========================================================================== */
.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-inverse);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
    margin-top: auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-logo {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
}

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-list a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

.footer-list a:hover {
    color: var(--color-text-inverse);
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* Responsive Design
   ========================================================================== */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-4xl: 2rem;
    }

    .header .container {
        flex-direction: column;
        height: auto;
        padding: var(--spacing-md) var(--spacing-lg);
        gap: var(--spacing-md);
    }

    .nav-list {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-md);
    }

    .hero {
        padding: var(--spacing-2xl) 0;
    }

    .product-detail-grid {
        grid-template-columns: 1fr;
    }

    .spec-item {
        grid-template-columns: 1fr;
    }

    .variant-buttons {
        width: 100%;
    }

    .variant-buttons .btn {
        width: 100%;
    }
}

/* Print Styles
   ========================================================================== */
@media print {
    .header,
    .footer {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    a {
        color: var(--color-text);
        text-decoration: underline;
    }
}

/* Accessibility
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000000;
        --color-text-light: #000000;
    }
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: var(--color-text-inverse);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 1000;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}