/* ============================================
   Jitensha (自転車) - Design System
   Japanese Minimalist UI
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Noto+Sans+JP:wght@300;400;500;700&display=swap');

:root {
    --bg-primary: #FAFAF8;
    --bg-secondary: #F0EFEB;
    --bg-card: #FFFFFF;
    --bg-dark: #1A1A1A;
    --text-primary: #2D2D2D;
    --text-secondary: #6B6B6B;
    --text-light: #9B9B9B;
    --text-white: #F5F5F3;
    --accent: #C41E3A;
    --accent-hover: #A01830;
    --accent-light: rgba(196,30,58,0.08);
    --border: #E5E4E0;
    --border-light: #F0EFEB;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --font-sans: 'Inter', 'Noto Sans JP', sans-serif;
    --font-jp: 'Noto Sans JP', sans-serif;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --header-h: 64px;
}

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

html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 15px;
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }

/* ---- Header / Navbar ---- */
.navbar {
    position: sticky; top: 0; z-index: 100;
    background: rgba(250,250,248,0.85);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
    height: var(--header-h);
}
.navbar .container {
    display: flex; align-items: center; justify-content: space-between;
    height: 100%;
}
.navbar-brand {
    display: flex; align-items: center; gap: 10px;
    font-weight: 700; font-size: 1.25rem; letter-spacing: -0.5px;
}
.navbar-brand .jp { font-family: var(--font-jp); color: var(--accent); font-size: 0.85rem; }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
    font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
    position: relative; transition: color var(--transition); padding: 4px 0;
}
.nav-links a:hover, .nav-links a.active { color: var(--text-primary); }
.nav-links a.active::after {
    content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
    height: 2px; background: var(--accent); border-radius: 1px;
}
.nav-search {
    display: flex; align-items: center; gap: 8px;
    background: var(--bg-secondary); border-radius: 100px;
    padding: 8px 16px; width: 220px; border: 1px solid transparent;
    transition: all var(--transition);
}
.nav-search:focus-within { border-color: var(--border); background: var(--bg-card); width: 280px; }
.nav-search input {
    border: none; background: none; outline: none; width: 100%;
    font-size: 0.85rem; color: var(--text-primary);
}
.nav-search svg { flex-shrink: 0; color: var(--text-light); }
.mobile-toggle { display: none; background: none; border: none; padding: 8px; }

/* ---- Hero ---- */
.hero {
    padding: 80px 0 60px;
    text-align: center;
}
.hero h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700; letter-spacing: -1px;
    line-height: 1.2; margin-bottom: 16px;
}
.hero h1 .accent { color: var(--accent); }
.hero p {
    font-size: 1.05rem; color: var(--text-secondary);
    max-width: 520px; margin: 0 auto 32px;
}

/* ---- Section ---- */
.section { padding: 48px 0; }
.section-header {
    display: flex; align-items: center; justify-content: space-between;
    margin-bottom: 28px;
}
.section-header h2 {
    font-size: 1.35rem; font-weight: 700; letter-spacing: -0.5px;
}
.section-header h2 .jp-sub {
    font-family: var(--font-jp); font-size: 0.75rem;
    color: var(--text-light); font-weight: 400; margin-left: 8px;
}
.section-link {
    font-size: 0.85rem; font-weight: 500; color: var(--accent);
    display: flex; align-items: center; gap: 4px;
    transition: gap var(--transition);
}
.section-link:hover { gap: 8px; }

/* ---- Video Card ---- */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}
.video-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition);
}
.video-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border);
}
.video-card-thumb {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
    background: var(--bg-secondary);
}
.video-card-thumb img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform var(--transition);
}
.video-card:hover .video-card-thumb img { transform: scale(1.03); }
.video-card-duration {
    position: absolute; bottom: 8px; right: 8px;
    background: rgba(0,0,0,0.8); color: #fff;
    font-size: 0.75rem; font-weight: 500;
    padding: 2px 8px; border-radius: 4px;
}
.video-card-play {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: rgba(0,0,0,0); transition: background var(--transition);
}
.video-card:hover .video-card-play { background: rgba(0,0,0,0.15); }
.video-card-play svg {
    width: 48px; height: 48px; fill: #fff;
    opacity: 0; transform: scale(0.8);
    transition: all var(--transition);
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
}
.video-card:hover .video-card-play svg { opacity: 1; transform: scale(1); }
.video-card-body { padding: 16px; }
.video-card-title {
    font-size: 0.95rem; font-weight: 600; line-height: 1.4;
    margin-bottom: 8px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.video-card-meta {
    display: flex; align-items: center; gap: 12px;
    font-size: 0.8rem; color: var(--text-light);
}
.video-card-meta span { display: flex; align-items: center; gap: 4px; }

/* ---- Playlist Cards ---- */
.playlist-scroll {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}
.playlist-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition);
}
.playlist-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.playlist-card-thumb {
    aspect-ratio: 16/9; overflow: hidden;
    background: var(--bg-secondary); position: relative;
}
.playlist-card-thumb img { width: 100%; height: 100%; object-fit: cover; }
.playlist-card-count {
    position: absolute; bottom: 0; right: 0;
    background: rgba(0,0,0,0.8); color: #fff;
    font-size: 0.75rem; padding: 6px 12px;
    display: flex; align-items: center; gap: 4px;
}
.playlist-card-body { padding: 14px 16px; }
.playlist-card-title { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.playlist-card-desc { font-size: 0.8rem; color: var(--text-light); }

/* ---- Article Card ---- */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}
.article-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-light);
    transition: all var(--transition);
    display: flex; flex-direction: column;
}
.article-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.article-card-img {
    aspect-ratio: 2/1; overflow: hidden;
    background: var(--bg-secondary);
}
.article-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition); }
.article-card:hover .article-card-img img { transform: scale(1.03); }
.article-card-body { padding: 20px; flex: 1; display: flex; flex-direction: column; }
.article-card-category {
    font-size: 0.75rem; font-weight: 600; color: var(--accent);
    text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px;
}
.article-card-title {
    font-size: 1.05rem; font-weight: 600; line-height: 1.4;
    margin-bottom: 10px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card-excerpt {
    font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6;
    margin-bottom: 16px; flex: 1;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.article-card-footer {
    display: flex; align-items: center; justify-content: space-between;
    font-size: 0.78rem; color: var(--text-light);
}

/* ---- Video Player Page ---- */
.video-player-wrap {
    position: relative; width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}
/* Block YouTube top bar (title + share/copy link button) */
.video-player-wrap::after {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 60px;
    z-index: 10;
    cursor: default;
    background: transparent;
}
/* Block YouTube bottom-left share/copy link icon */
.video-player-wrap::before {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 50px; height: 50px;
    z-index: 10;
    cursor: default;
    background: transparent;
}
.video-iframe {
    width: 100%; height: 100%;
    border: none;
}
.video-detail { padding: 28px 0; }
.video-detail h1 {
    font-size: 1.5rem; font-weight: 700;
    letter-spacing: -0.5px; margin-bottom: 12px;
}
.video-meta-bar {
    display: flex; align-items: center; gap: 20px;
    font-size: 0.85rem; color: var(--text-secondary);
    padding-bottom: 20px; border-bottom: 1px solid var(--border-light);
    margin-bottom: 20px;
}
.video-meta-bar span { display: flex; align-items: center; gap: 5px; }
.video-description {
    font-size: 0.92rem; color: var(--text-secondary);
    line-height: 1.8; max-width: 720px;
}

/* ---- Video Page Layout ---- */
.video-page-grid {
    display: grid;
    grid-template-columns: 1fr 360px;
    gap: 32px;
    padding: 24px 0;
}
.sidebar-playlist {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    overflow: hidden;
    height: fit-content;
    position: sticky; top: calc(var(--header-h) + 16px);
}
.sidebar-playlist-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-light);
    font-weight: 600; font-size: 0.92rem;
}
.sidebar-playlist-header small {
    display: block; font-weight: 400;
    font-size: 0.78rem; color: var(--text-light); margin-top: 2px;
}
.sidebar-video-list { max-height: 520px; overflow-y: auto; }
.sidebar-video-item {
    display: flex; gap: 12px; padding: 10px 16px;
    border-bottom: 1px solid var(--border-light);
    transition: background var(--transition);
}
.sidebar-video-item:hover { background: var(--bg-secondary); }
.sidebar-video-item.active { background: var(--accent-light); border-left: 3px solid var(--accent); }
.sidebar-video-item-thumb {
    width: 120px; flex-shrink: 0;
    aspect-ratio: 16/9; border-radius: var(--radius-sm);
    overflow: hidden; background: var(--bg-secondary);
}
.sidebar-video-item-thumb img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-video-item-info { flex: 1; min-width: 0; }
.sidebar-video-item-title {
    font-size: 0.82rem; font-weight: 500; line-height: 1.3;
    margin-bottom: 4px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.sidebar-video-item-meta { font-size: 0.72rem; color: var(--text-light); }

/* ---- Blog Article Page ---- */
.article-content {
    max-width: 720px;
    margin: 0 auto;
    padding: 40px 0 60px;
}
.article-content h1 {
    font-size: 2rem; font-weight: 700;
    letter-spacing: -1px; line-height: 1.3;
    margin-bottom: 16px;
}
.article-header-meta {
    display: flex; gap: 16px; font-size: 0.85rem;
    color: var(--text-light); margin-bottom: 32px;
    padding-bottom: 24px; border-bottom: 1px solid var(--border-light);
}
.article-featured-img {
    width: 100%; aspect-ratio: 2/1;
    border-radius: var(--radius-lg);
    overflow: hidden; margin-bottom: 32px;
}
.article-featured-img img { width: 100%; height: 100%; object-fit: cover; }
.article-body { font-size: 1rem; line-height: 1.9; color: var(--text-primary); }
.article-body h2 { font-size: 1.4rem; margin: 32px 0 16px; font-weight: 600; }
.article-body h3 { font-size: 1.15rem; margin: 24px 0 12px; font-weight: 600; }
.article-body p { margin-bottom: 18px; }
.article-body img { border-radius: var(--radius-md); margin: 24px 0; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 18px; }
.article-body blockquote {
    border-left: 3px solid var(--accent);
    padding: 12px 20px; margin: 24px 0;
    background: var(--accent-light);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-style: italic; color: var(--text-secondary);
}

/* ---- Search/Filter Bar ---- */
.filter-bar {
    display: flex; gap: 12px; align-items: center;
    margin-bottom: 32px; flex-wrap: wrap;
}
.filter-bar .search-input {
    flex: 1; min-width: 200px;
    padding: 10px 16px 10px 40px;
    border: 1px solid var(--border);
    border-radius: 100px;
    background: var(--bg-card);
    font-size: 0.9rem;
    transition: border-color var(--transition);
    outline: none;
}
.filter-bar .search-input:focus { border-color: var(--accent); }
.filter-bar .search-icon {
    position: absolute; left: 14px; top: 50%;
    transform: translateY(-50%); color: var(--text-light);
}
.filter-bar .search-wrap { position: relative; flex: 1; min-width: 200px; }
.filter-select {
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 100px;
    background: var(--bg-card);
    font-size: 0.85rem;
    color: var(--text-secondary);
    outline: none; cursor: pointer;
    appearance: none;
    padding-right: 36px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236B6B6B' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}

/* ---- Pagination ---- */
.pagination {
    display: flex; justify-content: center; gap: 6px;
    padding: 40px 0;
}
.pagination a, .pagination span {
    display: flex; align-items: center; justify-content: center;
    width: 40px; height: 40px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem; font-weight: 500;
    border: 1px solid var(--border);
    transition: all var(--transition);
}
.pagination a:hover { background: var(--bg-secondary); }
.pagination .active {
    background: var(--accent); color: #fff;
    border-color: var(--accent);
}

/* ---- Buttons ---- */
.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 10px 24px;
    border-radius: 100px;
    font-size: 0.88rem; font-weight: 500;
    border: none;
    transition: all var(--transition);
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); transform: translateY(-1px); }
.btn-outline {
    background: transparent; color: var(--text-primary);
    border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--text-primary); }
.btn-sm { padding: 7px 16px; font-size: 0.82rem; }

/* ---- Footer ---- */
.footer {
    background: var(--bg-dark); color: var(--text-white);
    padding: 48px 0 24px; margin-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px; margin-bottom: 40px;
}
.footer-brand { font-size: 1.2rem; font-weight: 700; margin-bottom: 12px; }
.footer-brand .jp { color: var(--accent); font-family: var(--font-jp); font-size: 0.8rem; }
.footer-desc { font-size: 0.85rem; color: #999; line-height: 1.7; }
.footer h4 { font-size: 0.85rem; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { font-size: 0.85rem; color: #999; transition: color var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.8rem; color: #666;
}
.footer-stats { display: flex; gap: 20px; }
.footer-stats span { display: flex; align-items: center; gap: 5px; }

/* ---- Page Header ---- */
.page-header {
    padding: 48px 0 32px;
    border-bottom: 1px solid var(--border-light);
    margin-bottom: 32px;
}
.page-header h1 { font-size: 1.8rem; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 8px; }
.page-header p { color: var(--text-secondary); font-size: 0.95rem; }

/* ---- Playlist Detail ---- */
.playlist-header {
    display: flex; gap: 32px; padding: 40px 0;
    align-items: center;
}
.playlist-header-thumb {
    width: 320px; flex-shrink: 0;
    aspect-ratio: 16/9; border-radius: var(--radius-lg);
    overflow: hidden; background: var(--bg-secondary);
}
.playlist-header-thumb img { width: 100%; height: 100%; object-fit: cover; }
.playlist-header-info h1 { font-size: 1.6rem; font-weight: 700; margin-bottom: 12px; }
.playlist-header-info p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.7; }
.playlist-header-stats { display: flex; gap: 20px; font-size: 0.85rem; color: var(--text-light); }

/* ---- Empty State ---- */
.empty-state {
    text-align: center; padding: 80px 20px;
    color: var(--text-light);
}
.empty-state svg { margin: 0 auto 16px; opacity: 0.4; }
.empty-state h3 { font-size: 1.1rem; margin-bottom: 8px; color: var(--text-secondary); }

/* ---- Loading ---- */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}
.skeleton {
    background: linear-gradient(90deg, var(--bg-secondary) 25%, var(--border-light) 50%, var(--bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-sm);
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
    .video-page-grid { grid-template-columns: 1fr; }
    .sidebar-playlist { position: static; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .playlist-scroll { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
    .container { padding: 0 16px; }
    .nav-links { display: none; }
    .nav-search { display: none; }
    .mobile-toggle { display: block; }
    .nav-links.open {
        display: flex; flex-direction: column;
        position: absolute; top: var(--header-h); left: 0; right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border);
        padding: 20px 24px; gap: 16px;
        box-shadow: var(--shadow-md);
    }
    .hero { padding: 48px 0 32px; }
    .hero h1 { font-size: 1.7rem; }
    .video-grid { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
    .article-grid { grid-template-columns: 1fr; }
    .playlist-header { flex-direction: column; }
    .playlist-header-thumb { width: 100%; }
    .playlist-scroll {
        display: grid;
        grid-template-columns: 1fr 1fr;
        overflow-x: visible;
        scroll-snap-type: none;
    }
    .playlist-card { flex: none; }
    .article-content h1 { font-size: 1.5rem; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }
    .filter-bar { flex-direction: column; }
}

/* ---- Mobile Nav Overlay ---- */
.mobile-nav-overlay {
    display: none; position: fixed; inset: 0;
    background: rgba(0,0,0,0.3); z-index: 99;
}
.mobile-nav-overlay.open { display: block; }

/* ---- Animations ---- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}
.animate-in {
    animation: fadeInUp 0.5s ease forwards;
    opacity: 0;
}
.animate-in:nth-child(2) { animation-delay: 0.05s; }
.animate-in:nth-child(3) { animation-delay: 0.1s; }
.animate-in:nth-child(4) { animation-delay: 0.15s; }
.animate-in:nth-child(5) { animation-delay: 0.2s; }
.animate-in:nth-child(6) { animation-delay: 0.25s; }