:root {
    --bg-primary: #07111f;
    --bg-secondary: #0b1728;
    --surface: rgba(11, 23, 40, 0.82);
    --surface-strong: #101c2f;
    --surface-soft: rgba(255, 255, 255, 0.05);
    --text-primary: #f5f7fb;
    --text-secondary: #b5c3d6;
    --text-muted: #8c9cb1;
    --accent: #2e6cff;
    --accent-strong: #1f58da;
    --accent-soft: rgba(46, 108, 255, 0.16);
    --border-color: rgba(180, 199, 225, 0.16);
    --shadow: 0 24px 64px rgba(1, 10, 24, 0.42);
}

[data-theme="light"] {
    --bg-primary: #eef3fa;
    --bg-secondary: #f7f9fc;
    --surface: rgba(255, 255, 255, 0.92);
    --surface-strong: #ffffff;
    --surface-soft: rgba(7, 17, 31, 0.04);
    --text-primary: #102038;
    --text-secondary: #40526f;
    --text-muted: #667892;
    --accent: #2e6cff;
    --accent-strong: #184fc8;
    --accent-soft: rgba(46, 108, 255, 0.1);
    --border-color: rgba(16, 32, 56, 0.1);
    --shadow: 0 20px 50px rgba(27, 45, 74, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background:
        radial-gradient(circle at top left, rgba(46, 108, 255, 0.18), transparent 30%),
        radial-gradient(circle at top right, rgba(89, 132, 255, 0.14), transparent 24%),
        linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    min-height: 100vh;
}

a {
    color: inherit;
}

.container,
.nav-container,
.hero-container {
    width: min(1160px, calc(100% - 40px));
    margin: 0 auto;
}

.narrow-container {
    width: min(860px, calc(100% - 40px));
}

.navbar {
    position: fixed;
    inset: 0 0 auto 0;
    z-index: 1000;
    background: rgba(7, 17, 31, 0.82);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid var(--border-color);
}

[data-theme="light"] .navbar {
    background: rgba(255, 255, 255, 0.82);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 74px;
}

.nav-logo h2 {
    font-size: 1.5rem;
    letter-spacing: 0.08em;
    color: var(--accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 1.4rem;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 600;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.nav-link:hover,
.nav-link:focus-visible {
    color: var(--text-primary);
}

.nav-link.cta-button,
.cta-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-strong) 100%);
    color: #fff;
    border-radius: 16px;
    padding: 0.9rem 1.3rem;
    font-weight: 700;
    box-shadow: 0 18px 34px rgba(46, 108, 255, 0.25);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.nav-link.cta-button:hover,
.cta-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 22px 40px rgba(46, 108, 255, 0.32);
}

.theme-toggle {
    width: 42px;
    height: 42px;
    border-radius: 999px;
    border: 1px solid var(--border-color);
    background: var(--surface-soft);
    color: var(--text-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.hamburger span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 999px;
}

.hero {
    position: relative;
    padding: 132px 0 84px;
}

.index-hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(120deg, rgba(4, 10, 22, 0.86) 18%, rgba(5, 15, 31, 0.72) 56%, rgba(8, 18, 33, 0.82) 100%),
        url("../heronew.png") center/cover no-repeat;
    z-index: -2;
}

.index-hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(7, 17, 31, 0.2) 0%, rgba(7, 17, 31, 0.88) 100%);
    z-index: -1;
}

.hero-container {
    display: grid;
    grid-template-columns: minmax(0, 760px);
}

.hero-content {
    padding: 2.5rem 0 1rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.95rem;
    border-radius: 999px;
    border: 1px solid rgba(143, 177, 255, 0.24);
    background: rgba(18, 36, 66, 0.78);
    color: #d9e6ff;
    font-size: 0.86rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.hero-title {
    margin-top: 1.3rem;
    font-size: clamp(2.6rem, 5vw, 4.8rem);
    line-height: 1.04;
    max-width: 12ch;
    letter-spacing: -0.04em;
    color: #ffffff;
}

.hero-subtitle {
    margin-top: 1.4rem;
    max-width: 58ch;
    font-size: 1.18rem;
    color: #d5dfef;
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.cta-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.9rem 1.3rem;
    border-radius: 16px;
    border: 1px solid rgba(170, 194, 240, 0.24);
    color: #e8f0ff;
    text-decoration: none;
    font-weight: 700;
    background: rgba(10, 20, 36, 0.48);
}

.blog {
    padding: 84px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2,
.about-text h2 {
    font-size: clamp(2rem, 3vw, 3rem);
    line-height: 1.08;
    letter-spacing: -0.03em;
}

.section-header p,
.about-text p {
    color: var(--text-secondary);
    max-width: 62ch;
    margin: 1rem auto 0;
}

.article-list {
    display: grid;
    gap: 1.25rem;
}

.article-card,
.blog-post,
.info-surface {
    background: var(--surface);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    border-radius: 28px;
}

.article-card {
    padding: 1.6rem 1.6rem 1.5rem;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.article-card:hover {
    transform: translateY(-2px);
    border-color: rgba(114, 156, 255, 0.28);
}

.article-card-meta,
.post-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

.post-date,
.reading-time span {
    color: var(--text-muted);
}

.post-category,
.featured-badge,
.stat {
    display: inline-flex;
    align-items: center;
    padding: 0.35rem 0.7rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: #dfeaff;
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 0.02em;
    border: 1px solid rgba(121, 162, 255, 0.18);
}

[data-theme="light"] .post-category,
[data-theme="light"] .featured-badge,
[data-theme="light"] .stat {
    color: var(--accent-strong);
}

.featured-badge {
    background: rgba(255, 255, 255, 0.08);
}

.article-card-title,
.post-title {
    font-size: clamp(1.6rem, 3vw, 2.6rem);
    line-height: 1.15;
    letter-spacing: -0.03em;
}

.article-card-title a,
.post-title .title-link,
.article-card-link,
.article-backlink a,
.references a,
.footer-section a {
    text-decoration: none;
}

.article-card-title a:hover,
.post-title .title-link:hover,
.article-card-link:hover,
.article-backlink a:hover,
.references a:hover,
.footer-section a:hover {
    color: var(--accent);
}

.article-card-excerpt,
.post-excerpt {
    margin-top: 0.9rem;
    color: var(--text-secondary);
}

.article-card-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 1rem;
    color: var(--accent);
    font-weight: 700;
}

.about {
    padding: 0 0 84px;
}

.about-content {
    background: linear-gradient(180deg, rgba(14, 28, 49, 0.9) 0%, rgba(9, 18, 32, 0.92) 100%);
    border: 1px solid rgba(159, 188, 245, 0.12);
    box-shadow: var(--shadow);
    border-radius: 32px;
    padding: 2rem;
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(240px, 0.8fr);
    gap: 2rem;
    align-items: center;
}

[data-theme="light"] .about-content {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.95) 0%, rgba(246, 249, 255, 0.95) 100%);
}

.about-text .cta-primary {
    margin-top: 1.5rem;
}

.about-visual {
    justify-self: center;
    width: 100%;
    max-width: 320px;
    aspect-ratio: 1;
    border-radius: 30px;
    background:
        radial-gradient(circle at top, rgba(61, 126, 255, 0.24), transparent 30%),
        linear-gradient(145deg, rgba(11, 23, 40, 0.94) 0%, rgba(20, 40, 76, 0.94) 100%);
    border: 1px solid rgba(167, 192, 240, 0.14);
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-visual svg {
    width: 80%;
    height: auto;
}

.article-shell {
    padding: 126px 0 84px;
}

.article-backlink {
    margin-bottom: 1rem;
}

.article-backlink a {
    color: var(--text-secondary);
    font-weight: 700;
}

.blog-post {
    padding: 2.2rem;
}

.post-title {
    margin-bottom: 1rem;
}

.post-title .permalink {
    margin-left: 0.5rem;
    color: var(--text-muted);
}

.posts-toc,
.references,
.post-cta {
    margin-top: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 22px;
    padding: 1.35rem 1.4rem;
}

[data-theme="light"] .posts-toc,
[data-theme="light"] .references,
[data-theme="light"] .post-cta {
    background: rgba(12, 28, 49, 0.03);
}

.posts-toc .toc-heading,
.references h5,
.post-content h4,
.post-content h5,
.post-cta h4 {
    color: var(--text-primary);
}

.posts-toc .toc-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 0.6rem 1rem;
    margin-top: 0.75rem;
}

.posts-toc .toc-list a {
    color: var(--text-secondary);
}

.post-content {
    color: var(--text-secondary);
    font-size: 1.08rem;
}

.post-content p,
.post-content ul,
.post-content ol,
.references li {
    margin-top: 1rem;
}

.post-content strong,
.post-content em {
    color: var(--text-primary);
}

.post-content a,
.references a {
    color: #8db6ff;
}

.premium-cta,
.post-cta {
    text-align: left;
}

.premium-cta .cta-primary,
.post-cta .cta-primary {
    margin-top: 1rem;
}

.footer {
    border-top: 1px solid var(--border-color);
    background: rgba(3, 10, 20, 0.7);
    padding: 56px 0 20px;
}

[data-theme="light"] .footer {
    background: rgba(255, 255, 255, 0.62);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.8rem;
    margin-bottom: 1.8rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 0.9rem;
    color: var(--text-primary);
}

.footer-section p,
.footer-section a,
.footer-bottom {
    color: var(--text-secondary);
}

.footer-section a {
    display: block;
    margin-bottom: 0.55rem;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.4rem;
    text-align: center;
}

@media (max-width: 920px) {
    .hero-title {
        max-width: 13ch;
    }

    .about-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 74px;
        left: 20px;
        right: 20px;
        padding: 1rem;
        border-radius: 22px;
        background: rgba(7, 17, 31, 0.97);
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow);
        flex-direction: column;
        align-items: stretch;
    }

    [data-theme="light"] .nav-menu {
        background: rgba(255, 255, 255, 0.98);
    }

    .nav-menu.active {
        display: flex;
    }

    .hamburger {
        display: flex;
    }

    .hero {
        padding: 116px 0 70px;
    }

    .hero-subtitle {
        font-size: 1.02rem;
    }

    .blog-post,
    .article-card,
    .about-content {
        padding: 1.4rem;
        border-radius: 24px;
    }

    .article-shell {
        padding-top: 108px;
    }

    .post-content {
        font-size: 1rem;
    }
}