@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=DM+Sans:ital,wght@0,400;0,500;0,700;1,400&display=swap');

:root {
    --bg: #f0f0f3;
    --surface: #ffffff;
    --text: #111827;
    --text-soft: #4b5563;
    --text-muted: #9ca3af;
    --border: rgba(0,0,0,.06);
    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --accent-soft: rgba(99,102,241,.08);
    --accent-glow: rgba(99,102,241,.25);
    --gradient: linear-gradient(135deg, #6366f1, #8b5cf6, #a78bfa);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    --radius: 20px;
    --radius-sm: 12px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,.04), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,.06);
    --shadow-lg: 0 20px 60px rgba(0,0,0,.1);
    --shadow-glow: 0 0 40px var(--accent-glow);
    --transition: .3s cubic-bezier(.4,0,.2,1);
    --font-heading: 'Space Grotesk', system-ui, sans-serif;
    --font-body: 'DM Sans', system-ui, sans-serif;
}

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

html { scroll-behavior: smooth }

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

/* ── Animations ── */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px) }
    to   { opacity: 1; transform: translateY(0) }
}
@keyframes fadeIn {
    from { opacity: 0 }
    to   { opacity: 1 }
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-12px) }
    to   { opacity: 1; transform: translateY(0) }
}
@keyframes shimmer {
    0%   { background-position: -200% 0 }
    100% { background-position: 200% 0 }
}

/* ── Topbar / Navbar ── */
.topbar {
    position: sticky;
    top: 0;
    z-index: 200;
    background: rgba(255,255,255,.72);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    animation: slideDown .5s ease;
}
.topbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 64px;
}
.topbar .brand {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    letter-spacing: -.5px;
    display: flex;
    align-items: center;
    gap: .5rem;
    transition: color var(--transition);
}
.topbar .brand:hover { color: var(--accent) }
.topbar .brand .brand-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--gradient);
    display: inline-block;
    flex-shrink: 0;
}

.topbar nav {
    display: flex;
    align-items: center;
    gap: .25rem;
}
.topbar nav a {
    color: var(--text-soft);
    text-decoration: none;
    font-family: var(--font-heading);
    font-size: .82rem;
    font-weight: 500;
    padding: .4rem .9rem;
    border-radius: 100px;
    transition: all var(--transition);
    position: relative;
}
.topbar nav a:hover {
    color: var(--accent);
    background: var(--accent-soft);
}
.topbar nav a.active {
    color: #fff;
    background: var(--accent);
    box-shadow: 0 2px 12px var(--accent-glow);
}

/* ── Hero Section (Home) ── */
.hero {
    background: var(--gradient-dark);
    padding: 5rem 2rem 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 140%;
    height: 200%;
    background: radial-gradient(ellipse at 30% 50%, rgba(99,102,241,.15) 0%, transparent 60%),
                radial-gradient(ellipse at 70% 30%, rgba(139,92,246,.1) 0%, transparent 50%);
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 80px;
    background: linear-gradient(to top, var(--bg), transparent);
    pointer-events: none;
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 680px;
    margin: 0 auto;
    animation: fadeUp .7s ease;
}
.hero h1 {
    font-family: var(--font-heading);
    font-size: 3.2rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: -1.5px;
    line-height: 1.15;
    margin-bottom: 1rem;
}
.hero h1 .accent-text {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    color: rgba(255,255,255,.6);
    font-size: 1.05rem;
    line-height: 1.7;
    max-width: 480px;
    margin: 0 auto;
}

/* ── Section titles ── */
.section-label {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    font-family: var(--font-heading);
    font-size: .78rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-muted);
}
.section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

/* ── Main ── */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem 4rem;
}

/* ── Post Grid ── */
.post-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.75rem;
}

/* ── Post Card ── */
.post-card {
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--border);
    animation: fadeUp .6s ease both;
}
.post-card:nth-child(2) { animation-delay: .08s }
.post-card:nth-child(3) { animation-delay: .16s }
.post-card:nth-child(4) { animation-delay: .24s }
.post-card:nth-child(5) { animation-delay: .32s }
.post-card:nth-child(6) { animation-delay: .4s }

.post-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.post-card .card-img {
    position: relative;
    overflow: hidden;
}
.post-card .card-img::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,.15), transparent 50%);
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition);
}
.post-card:hover .card-img::after { opacity: 1 }

.post-card .card-img img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
    transition: transform .5s cubic-bezier(.4,0,.2,1);
}
.post-card:hover .card-img img {
    transform: scale(1.06);
}
.post-card .card-body {
    padding: 1.5rem 1.6rem 1.8rem;
    flex: 1;
    display: flex;
    flex-direction: column;
}
.post-card .card-meta {
    display: flex;
    align-items: center;
    gap: .6rem;
    font-size: .75rem;
    color: var(--text-muted);
    margin-bottom: .6rem;
    flex-wrap: wrap;
}
.tag {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-heading);
    font-size: .68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .8px;
    padding: 4px 12px;
    border-radius: 8px;
}
.post-card .card-body h2 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.35;
    margin-bottom: .5rem;
    color: var(--text);
    letter-spacing: -.3px;
}
.post-card .card-body h2 a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}
.post-card .card-body h2 a:hover { color: var(--accent) }
.post-card .card-body .excerpt {
    color: var(--text-soft);
    font-size: .88rem;
    line-height: 1.6;
    flex: 1;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.read-more {
    display: inline-flex;
    align-items: center;
    gap: .4rem;
    margin-top: 1.1rem;
    color: var(--accent);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: .82rem;
    text-decoration: none;
    transition: gap var(--transition), color var(--transition);
}
.read-more:hover { gap: .7rem; color: var(--accent-hover) }
.read-more svg { width: 16px; height: 16px; flex-shrink: 0 }

/* ── Featured card (first post) ── */
.post-card.featured {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    border: none;
    background: var(--gradient-dark);
    color: #fff;
    box-shadow: var(--shadow-lg);
}
.post-card.featured:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg), var(--shadow-glow) }
.post-card.featured .card-img img { height: 100%; min-height: 360px }
.post-card.featured .card-body { padding: 2.5rem; justify-content: center }
.post-card.featured .card-meta { color: rgba(255,255,255,.5) }
.post-card.featured .card-body h2 { font-size: 1.8rem; color: #fff; letter-spacing: -.5px }
.post-card.featured .card-body h2 a { color: #fff }
.post-card.featured .card-body h2 a:hover { color: #a5b4fc }
.post-card.featured .card-body .excerpt { color: rgba(255,255,255,.6); font-size: .95rem }
.post-card.featured .read-more { color: #a5b4fc }
.post-card.featured .read-more:hover { color: #c7d2fe }

/* ── Single Article ── */
.article-wrap {
    max-width: 760px;
    margin: 0 auto;
    padding: 2rem 1.5rem 5rem;
    animation: fadeUp .6s ease;
}
.hero-img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    display: block;
    border-radius: var(--radius);
    margin-bottom: 2.2rem;
    box-shadow: var(--shadow-lg);
}
.article-wrap .meta {
    display: flex;
    align-items: center;
    gap: .75rem;
    font-size: .78rem;
    color: var(--text-muted);
    margin-bottom: .6rem;
    flex-wrap: wrap;
}
.article-wrap h2 {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--text);
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 1rem;
}
.article-wrap .description {
    font-size: 1.15rem;
    color: var(--text-soft);
    line-height: 1.75;
    margin-bottom: 2.5rem;
    padding-bottom: 2.5rem;
    border-bottom: 2px solid var(--border);
}
.article-wrap .content {
    font-size: 1.05rem;
    color: var(--text);
    line-height: 1.85;
}
.article-wrap .content p { margin-bottom: 1.5rem }
.article-wrap .content strong { color: var(--text); font-weight: 700 }
.article-wrap .content h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: -.3px;
    margin: 2.5rem 0 1rem;
}
.article-wrap .content img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin: 2rem 0;
    box-shadow: var(--shadow-md);
}
.article-wrap .content blockquote {
    border-left: 4px solid var(--accent);
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    background: var(--accent-soft);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    color: var(--text-soft);
    font-style: italic;
    font-size: 1.05rem;
}
.article-wrap .content ul,
.article-wrap .content ol {
    margin: 1rem 0 1.5rem 1.5rem;
}
.article-wrap .content li {
    margin-bottom: .5rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    margin-top: 3.5rem;
    padding: .75rem 1.5rem;
    color: #fff;
    background: var(--accent);
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: .85rem;
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition);
    box-shadow: 0 2px 12px var(--accent-glow);
}
.back-link:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

/* ── Category Header ── */
.category-header {
    text-align: center;
    padding: 2.5rem 1rem 2rem;
    animation: fadeUp .5s ease;
}
.category-header h2 {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -.5px;
}
.category-header h2 span {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ── Empty state ── */
.empty {
    text-align: center;
    padding: 6rem 1.5rem;
    color: var(--text-muted);
    animation: fadeIn .5s ease;
}
.empty h2 {
    font-family: var(--font-heading);
    font-size: 8rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: .5rem;
    line-height: 1;
}
.empty p {
    font-size: 1.1rem;
    margin-bottom: .5rem;
    color: var(--text-soft);
}

/* ── Footer ── */
footer {
    background: var(--gradient-dark);
    color: rgba(255,255,255,.5);
    text-align: center;
    padding: 3rem 2rem;
    font-size: .82rem;
    margin-top: 0;
}
footer .footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}
footer .footer-name {
    font-family: var(--font-heading);
    font-weight: 700;
    color: rgba(255,255,255,.8);
}
footer .footer-desc {
    display: block;
    margin-top: .5rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
    color: rgba(255,255,255,.35);
    font-size: .78rem;
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .hero { padding: 3.5rem 1.5rem 3rem }
    .hero h1 { font-size: 2.2rem }
    .topbar-inner { padding: 0 1.25rem }
    .topbar nav { gap: .15rem }
    .topbar nav a { font-size: .75rem; padding: .35rem .65rem }
    .post-card.featured { grid-template-columns: 1fr }
    .post-card.featured .card-img img { height: 240px; min-height: unset }
    .post-card.featured .card-body { padding: 1.5rem 1.6rem 1.8rem }
    .post-card.featured .card-body h2 { font-size: 1.35rem }
    .post-grid { grid-template-columns: 1fr }
    main { padding: 2rem 1.25rem 3rem }
}

@media (max-width: 480px) {
    .hero { padding: 2.5rem 1rem 2rem }
    .hero h1 { font-size: 1.75rem; letter-spacing: -.8px }
    .hero p { font-size: .92rem }
    .topbar-inner { height: 56px; padding: 0 1rem }
    .topbar .brand { font-size: 1.2rem }
    .topbar nav a { font-size: .7rem; padding: .3rem .5rem }
    main { padding: 1.5rem 1rem 2rem }
    .post-card .card-img img { height: 180px }
    .post-card .card-body { padding: 1.2rem 1.3rem 1.4rem }
    .post-card .card-body h2 { font-size: 1.1rem }
    .article-wrap h2 { font-size: 1.6rem }
    .hero-img { border-radius: var(--radius-sm) }
    .category-header h2 { font-size: 1.4rem }
    footer { padding: 2rem 1rem }
}