/* ============================================
   Pulse Digital Blog — Shared Stylesheet
   Design System v1.0 準拠
   ============================================ */

:root {
    --bg-primary: #09090b;
    --bg-secondary: #18181b;
    --bg-card: rgba(255,255,255,0.03);
    --bg-card-hover: rgba(255,255,255,0.06);
    --border-primary: rgba(255,255,255,0.08);
    --border-hover: rgba(255,255,255,0.15);
    --text-primary: #fafafa;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --accent-pp: #a855f7;
    --accent-pp-glow: rgba(168,85,247,0.15);
    --accent-sp: #10b981;
    --accent-sp-glow: rgba(16,185,129,0.15);
    --accent-blog: #3b82f6;
    --accent-blog-glow: rgba(59,130,246,0.12);
    --gradient-hub: linear-gradient(135deg, #a855f7, #10b981);
    --gradient-blog: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    --max-w-content: 720px;
    --max-w-wide: 940px;
}

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

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter','Noto Sans JP',-apple-system,sans-serif;
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Header ── */
.hub-header {
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 32px;
    border-bottom: 1px solid var(--border-primary);
    position: sticky; top: 0; z-index: 50;
    background: rgba(9,9,11,0.85);
    backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
}
.hub-logo {
    font-size: 20px; font-weight: 800;
    letter-spacing: -0.5px; text-decoration: none;
}
.hub-logo span {
    background: var(--gradient-hub);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hub-nav { display: flex; gap: 20px; align-items: center; }
.hub-nav a {
    color: var(--text-muted); text-decoration: none;
    font-size: 14px; transition: color 0.2s;
}
.hub-nav a:hover { color: var(--text-primary); }
.hub-nav .nav-active { color: var(--text-primary); font-weight: 600; }

/* ── Blog Hero (Index) ── */
.blog-hero {
    max-width: 800px; margin: 0 auto;
    text-align: center;
    padding: 80px 24px 32px;
    position: relative;
}
.blog-hero::before {
    content: '';
    position: absolute; top: -60px; left: 50%; transform: translateX(-50%);
    width: 500px; height: 300px;
    background: radial-gradient(ellipse, rgba(59,130,246,0.08) 0%, rgba(139,92,246,0.05) 40%, transparent 70%);
    pointer-events: none; z-index: -1;
}
.blog-hero h1 {
    font-size: clamp(28px, 5vw, 44px);
    font-weight: 800; letter-spacing: -1.5px;
    line-height: 1.2; margin-bottom: 16px;
}
.blog-hero .gradient-text {
    background: var(--gradient-blog);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
}
.blog-hero p {
    font-size: 15px; color: var(--text-secondary);
    max-width: 500px; margin: 0 auto; line-height: 1.8;
}

/* ── Blog Card Grid (Index) ── */
.blog-grid-wrapper {
    max-width: var(--max-w-wide); margin: 0 auto;
    padding: 32px 24px 60px;
}
.blog-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.blog-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-decoration: none; color: inherit;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}
.blog-card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.25);
}
.card-meta {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 14px;
}
.card-tag {
    font-size: 11px; font-weight: 600;
    padding: 3px 10px; border-radius: 20px;
    letter-spacing: 0.3px;
}
.tag-ec { background: var(--accent-sp-glow); color: var(--accent-sp); }
.tag-seo { background: var(--accent-blog-glow); color: var(--accent-blog); }
.tag-cro { background: var(--accent-pp-glow); color: var(--accent-pp); }
.tag-perf { background: rgba(251,191,36,0.12); color: #fbbf24; }

.card-meta time {
    font-size: 12px; color: var(--text-muted);
}
.card-title {
    font-size: 20px; font-weight: 700;
    letter-spacing: -0.3px; line-height: 1.4;
    margin-bottom: 10px;
}
.card-excerpt {
    font-size: 14px; color: var(--text-secondary);
    line-height: 1.7; margin-bottom: 16px;
}
.card-read-more {
    font-size: 13px; font-weight: 600;
    color: var(--accent-blog);
    transition: color 0.2s;
}
.blog-card:hover .card-read-more { color: #60a5fa; }

/* ── Article Page ── */
.article-hero {
    max-width: var(--max-w-content); margin: 0 auto;
    padding: 72px 24px 40px;
    position: relative;
}
.article-hero::before {
    content: '';
    position: absolute; top: -80px; left: 50%; transform: translateX(-50%);
    width: 600px; height: 350px;
    background: radial-gradient(ellipse, rgba(59,130,246,0.06) 0%, transparent 60%);
    pointer-events: none; z-index: -1;
}
.article-meta {
    display: flex; align-items: center; gap: 12px;
    margin-bottom: 20px;
}
.article-hero h1 {
    font-size: clamp(24px, 4vw, 36px);
    font-weight: 800; letter-spacing: -1px;
    line-height: 1.35; margin-bottom: 16px;
}
.article-hero .article-lead {
    font-size: 15px; color: var(--text-secondary);
    line-height: 1.8;
}

/* ── Article Body ── */
.article-body {
    max-width: var(--max-w-content); margin: 0 auto;
    padding: 0 24px 60px;
}
.article-body h2 {
    font-size: 22px; font-weight: 700;
    letter-spacing: -0.3px; margin: 48px 0 16px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-primary);
    line-height: 1.35;
}
.article-body h3 {
    font-size: 17px; font-weight: 600;
    margin: 32px 0 12px; line-height: 1.4;
    color: var(--text-primary);
}
.article-body p {
    font-size: 15px; color: var(--text-secondary);
    line-height: 1.85; margin-bottom: 20px;
}
.article-body strong {
    color: var(--text-primary); font-weight: 600;
}
.article-body ul, .article-body ol {
    margin: 0 0 20px 20px;
}
.article-body li {
    font-size: 15px; color: var(--text-secondary);
    line-height: 1.8; margin-bottom: 8px;
}
.article-body code {
    background: rgba(255,255,255,0.06);
    padding: 2px 7px; border-radius: 5px;
    font-size: 13px; font-family: 'SF Mono', Consolas, monospace;
    color: #e2e8f0;
}
.article-body pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    overflow-x: auto;
    margin: 0 0 24px;
}
.article-body pre code {
    background: none; padding: 0;
    font-size: 13px; line-height: 1.7;
}
.article-body blockquote {
    border-left: 3px solid var(--accent-blog);
    padding: 16px 20px;
    margin: 0 0 24px;
    background: rgba(59,130,246,0.04);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.article-body blockquote p {
    margin-bottom: 0; font-size: 14px;
    color: var(--text-secondary);
}

/* Issue Card (Article) */
.issue-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    margin: 0 0 28px;
}
.issue-card h3 {
    margin-top: 0; font-size: 16px;
    display: flex; align-items: center; gap: 10px;
}
.issue-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 28px; height: 28px; border-radius: 8px;
    font-size: 13px; font-weight: 700;
    flex-shrink: 0;
}
.issue-num-warning { background: rgba(251,191,36,0.12); color: #fbbf24; }
.issue-num-error { background: rgba(248,113,113,0.12); color: #f87171; }
.issue-num-info { background: var(--accent-blog-glow); color: var(--accent-blog); }
.issue-impact {
    display: inline-block;
    font-size: 11px; font-weight: 600;
    padding: 3px 10px; border-radius: 20px;
    margin: 8px 0 12px;
}
.impact-high { background: rgba(248,113,113,0.12); color: #f87171; }
.impact-medium { background: rgba(251,191,36,0.12); color: #fbbf24; }
.issue-card p { font-size: 14px; }
.fix-steps {
    background: rgba(59,130,246,0.04);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    margin-top: 12px;
}
.fix-steps h4 {
    font-size: 12px; font-weight: 700;
    color: var(--accent-blog); letter-spacing: 0.5px;
    margin-bottom: 8px; text-transform: uppercase;
}
.fix-steps ol { margin: 0 0 0 16px; }
.fix-steps li {
    font-size: 13px; line-height: 1.7;
    margin-bottom: 4px;
}

/* ── Blog CTA ── */
.blog-cta {
    max-width: var(--max-w-wide); margin: 0 auto;
    padding: 0 24px 80px;
}
.cta-inner {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: 48px 40px;
    text-align: center;
    position: relative; overflow: hidden;
}
.cta-inner::before {
    content: '';
    position: absolute; top: -40px; left: 50%; transform: translateX(-50%);
    width: 400px; height: 200px;
    background: radial-gradient(ellipse, rgba(168,85,247,0.08), transparent 70%);
    pointer-events: none;
}
.cta-inner h2 {
    font-size: 22px; font-weight: 700;
    letter-spacing: -0.3px; margin-bottom: 12px;
    position: relative;
}
.cta-inner p {
    font-size: 14px; color: var(--text-secondary);
    margin-bottom: 28px; line-height: 1.7;
    position: relative;
}
.cta-buttons {
    display: flex; gap: 12px;
    justify-content: center; flex-wrap: wrap;
    position: relative;
}

/* ── Buttons ── */
.btn-primary {
    display: inline-block;
    padding: 14px 28px;
    border: none; border-radius: var(--radius-md);
    font-size: 14px; font-weight: 600;
    color: #fff; text-decoration: none;
    text-align: center; cursor: pointer;
    background: linear-gradient(135deg, var(--accent-pp), #9333ea);
    transition: all 0.25s ease;
}
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-secondary {
    display: inline-block;
    padding: 14px 28px;
    background: transparent;
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    font-size: 14px; font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none; text-align: center;
    transition: all 0.25s ease;
}
.btn-secondary:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
}

/* ── Breadcrumb ── */
.breadcrumb {
    display: flex; align-items: center; gap: 6px;
    font-size: 13px; margin-bottom: 24px;
}
.breadcrumb a {
    color: var(--text-muted); text-decoration: none;
    transition: color 0.2s;
}
.breadcrumb a:hover { color: var(--text-primary); }
.breadcrumb .sep { color: var(--text-muted); }
.breadcrumb .current { color: var(--text-secondary); }

/* ── Footer ── */
.footer {
    border-top: 1px solid var(--border-primary);
    padding: 64px 32px 32px;
    background: var(--bg-primary);
}
.footer a { color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
.footer a:hover { color: var(--text-primary); }
.footer-grid {
    display: grid; grid-template-columns: 2fr 1fr 1fr;
    gap: 48px; margin-bottom: 48px;
    max-width: 900px; margin-left: auto; margin-right: auto;
}
.f-brand { font-size: 16px; font-weight: 700; color: var(--text-primary); display: block; margin-bottom: 8px; }
.f-desc { font-size: 13px; color: var(--text-muted); line-height: 1.6; }
.footer-grid h4 { font-size: 13px; font-weight: 600; color: var(--text-secondary); margin-bottom: 12px; letter-spacing: 0.3px; }
.f-links { list-style: none; }
.f-links li { margin-bottom: 8px; }
.f-links a { font-size: 13px; }
.footer-bottom {
    border-top: 1px solid var(--border-primary);
    padding-top: 20px; text-align: center;
}
.footer-copy { color: var(--text-muted); font-size: 12px; }

/* ── Animations ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
.blog-card, .issue-card {
    opacity: 0;
    animation: fadeUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.blog-card:nth-child(1) { animation-delay: 0.1s; }
.blog-card:nth-child(2) { animation-delay: 0.2s; }
.blog-card:nth-child(3) { animation-delay: 0.3s; }
.issue-card:nth-child(1) { animation-delay: 0.05s; }
.issue-card:nth-child(2) { animation-delay: 0.1s; }
.issue-card:nth-child(3) { animation-delay: 0.15s; }
.issue-card:nth-child(4) { animation-delay: 0.2s; }
.issue-card:nth-child(5) { animation-delay: 0.25s; }

.article-hero h1, .article-hero .article-lead, .blog-hero h1, .blog-hero p {
    opacity: 0;
    animation: fadeUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
.blog-hero h1, .article-hero h1 { animation-delay: 0s; }
.blog-hero p, .article-hero .article-lead { animation-delay: 0.12s; }

/* ── Responsive ── */
@media (max-width: 640px) {
    .hub-header { padding: 16px 20px; }
    .hub-nav { gap: 14px; }
    .blog-hero { padding: 56px 20px 24px; }
    .blog-hero h1 { font-size: 28px; }
    .blog-grid-wrapper { padding: 20px 16px 48px; }
    .blog-card { padding: 24px 20px; }
    .card-title { font-size: 18px; }
    .article-hero { padding: 56px 20px 32px; }
    .article-body { padding: 0 20px 48px; }
    .article-body h2 { font-size: 19px; }
    .issue-card { padding: 20px; }
    .blog-cta { padding: 0 16px 60px; }
    .cta-inner { padding: 36px 24px; }
    .cta-buttons { flex-direction: column; }
    .footer { padding: 40px 20px 24px; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}