/*
Theme Name: WP Samples Index
Theme URI:
Author: Ryosuke Tsuboi
Author URI:
Description: WordPress sample sites index page. Displays a curated list of sample sites as cards.
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: wp-samples-index
*/

/* ============================================
   CSS Custom Properties
   ============================================ */
:root {
    --wsi-color-text: #111;
    --wsi-color-muted: #666;
    --wsi-color-bg: #fff;
    --wsi-color-card-bg: #fff;
    --wsi-color-card-bg-hover: #f8f8f8;
    --wsi-color-accent: #2563EB;
    --wsi-color-border: #e5e5e5;
    --wsi-font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    --wsi-max-width: 1000px;
    --wsi-radius: 8px;
    --wsi-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
    --wsi-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.1);
    --wsi-transition: 0.25s ease;
}

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

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

body {
    font-family: var(--wsi-font-sans);
    color: var(--wsi-color-text);
    background-color: var(--wsi-color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

a:hover {
    color: #1d4ed8;
}

/* ============================================
   Container
   ============================================ */
.wsi-container {
    max-width: var(--wsi-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Page Header
   ============================================ */
.wsi-header {
    text-align: center;
    padding: 80px 24px 48px;
}

.wsi-header__title {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    color: var(--wsi-color-text);
    margin-bottom: 8px;
}

.wsi-header__subtitle {
    font-size: 0.875rem;
    font-weight: 400;
    color: var(--wsi-color-muted);
    letter-spacing: 0.04em;
}

/* ============================================
   Card Grid
   ============================================ */
.wsi-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
    max-width: var(--wsi-max-width);
    margin: 0 auto;
    padding: 0 24px 80px;
}

/* ============================================
   Card
   ============================================ */
.wsi-card {
    background: var(--wsi-color-card-bg);
    border: 1px solid var(--wsi-color-border);
    border-radius: var(--wsi-radius);
    overflow: hidden;
    box-shadow: var(--wsi-shadow);
    transition: transform var(--wsi-transition), box-shadow var(--wsi-transition);
    display: flex;
    flex-direction: column;
}

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

/* Thumbnail */
.wsi-card__thumbnail {
    aspect-ratio: 16 / 9;
    position: relative;
    overflow: hidden;
    background: #f0f0f0;
}

.wsi-card__thumbnail-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    transition: transform var(--wsi-transition);
}

.wsi-card:hover .wsi-card__thumbnail-img {
    transform: scale(1.03);
}

/* Card body */
.wsi-card__body {
    padding: 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.wsi-card__tag {
    display: inline-block;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--wsi-color-muted);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin-bottom: 6px;
}

.wsi-card__name {
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--wsi-color-text);
    margin-bottom: 8px;
    line-height: 1.4;
}

.wsi-card__desc {
    font-size: 0.8125rem;
    color: var(--wsi-color-muted);
    line-height: 1.6;
    margin-bottom: 16px;
    flex: 1;
}

.wsi-card__link {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--wsi-color-accent);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--wsi-transition), color var(--wsi-transition);
}

.wsi-card__link:hover {
    gap: 8px;
    color: #1d4ed8;
}

/* ============================================
   Footer
   ============================================ */
.wsi-footer {
    text-align: center;
    padding: 32px 24px;
    border-top: 1px solid var(--wsi-color-border);
}

.wsi-footer__copy {
    font-size: 0.75rem;
    color: var(--wsi-color-muted);
    letter-spacing: 0.02em;
}

/* ============================================
   Responsive: Tablet (1024px)
   ============================================ */
@media (max-width: 1024px) {
    .wsi-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

/* ============================================
   Responsive: Mobile (768px)
   ============================================ */
@media (max-width: 768px) {
    .wsi-header {
        padding: 60px 24px 36px;
    }

    .wsi-header__title {
        font-size: 1.625rem;
    }

    .wsi-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

/* ============================================
   Responsive: Small Mobile (480px)
   ============================================ */
@media (max-width: 480px) {
    .wsi-header {
        padding: 48px 16px 28px;
    }

    .wsi-header__title {
        font-size: 1.375rem;
    }

    .wsi-header__subtitle {
        font-size: 0.8125rem;
    }

    .wsi-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 0 16px 60px;
    }

    .wsi-card__body {
        padding: 16px;
    }
}