:root {
    --cs-bg: #fff;
    --cs-text: #0f172a;
    --cs-muted: #64748b;
    --cs-accent: #111827;
    --cs-border: #e5e7eb;
    --cs-max: 1100px;
}

* {
    box-sizing: border-box
}

html {
    scroll-behavior: smooth
}

body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--cs-text);
    background: var(--cs-bg);
    line-height: 1.65
}

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

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

a:hover {
    text-decoration: underline
}

.cs-container {
    max-width: var(--cs-max);
    margin: 0 auto;
    padding: 0 1.25rem
}

/* Header — minimalist */
.cs-header {
    border-bottom: 1px solid var(--cs-border);
    background: #fff
}

.cs-header .cs-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.25rem;
    gap: 1rem
}

.cs-site-title {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--cs-text)
}

.cs-tagline {
    margin: .25rem 0 0;
    color: var(--cs-muted);
    font-size: .9rem
}

.cs-menu {
    list-style: none;
    display: flex;
    gap: 1.25rem;
    margin: 0;
    padding: 0
}

.cs-menu li a {
    color: var(--cs-text)
}

.cs-menu li a:hover {
    opacity: .7
}

/* NEW: Mobile nav toggle */
.cs-menu-toggle {
    display: none;
    border: 1px solid var(--cs-border);
    background: #fff;
    border-radius: .5rem;
    padding: .45rem .6rem;
    font-size: 1rem
}

@media (max-width: 840px) {
    .cs-menu-toggle {
        display: inline-block
    }

    .cs-nav {
        position: absolute;
        inset: 60px 0 auto 0;
        background: #fff;
        border-bottom: 1px solid var(--cs-border);
        display: none
    }

    .cs-nav.is-open {
        display: block
    }

    .cs-nav .cs-menu {
        flex-direction: column;
        padding: 1rem
    }
}

/* Hero */
.cs-hero {
    padding: 5rem 0 4rem;
    border-bottom: 1px solid var(--cs-border)
}

.cs-hero h1 {
    margin: 0 0 .75rem;
    font-size: clamp(2rem, 5vw, 3.25rem);
    line-height: 1.15;
    letter-spacing: -.02em
}

.cs-hero p {
    margin: 0;
    color: var(--cs-muted);
    font-size: 1.125rem;
    max-width: 60ch
}

.cs-cta {
    display: flex;
    gap: .75rem;
    margin-top: 1.5rem;
    flex-wrap: wrap
}

.cs-btn {
    display: inline-block;
    border: 1px solid var(--cs-text);
    padding: .7rem 1rem;
    border-radius: .5rem;
    color: var(--cs-text)
}

.cs-btn:hover {
    background: #111827;
    color: #fff;
    text-decoration: none
}

/* Sections */
.cs-section {
    padding: 3rem 0;
    border-bottom: 1px solid var(--cs-border)
}

.cs-section header {
    margin-bottom: 1.25rem
}

.cs-h2 {
    font-size: 1.5rem;
    letter-spacing: -.01em;
    margin: 0 0 .25rem
}

.cs-sub {
    color: var(--cs-muted);
    margin: 0
}

/* Cards & grids */
.cs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem
}

.cs-card {
    border: 1px solid var(--cs-border);
    border-radius: .75rem;
    background: #fff;
    overflow: hidden;
    transition: transform .2s ease
}

.cs-card:hover {
    transform: translateY(-2px)
}

.cs-card-body {
    padding: 1rem
}

.cs-card-title {
    margin: 0 0 .35rem;
    font-size: 1.125rem
}

.cs-card-excerpt,
.cs-muted {
    color: var(--cs-muted)
}

/* Article / page */
.cs-main {
    padding: 2rem 0
}

.cs-page-title,
.cs-entry-title,
.cs-archive-title {
    margin: 0 0 1rem;
    letter-spacing: -.01em
}

.cs-archive-header {
    margin-bottom: 1rem
}

/* Footer */
.cs-footer {
    border-top: 1px solid var(--cs-border);
    background: #fff
}

.cs-footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1.25rem 0
}

/* NEW: Sticky contact strip (mobile-first) */
.cs-sticky-contact {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 50;
    display: flex;
    gap: .5rem;
    justify-content: center;
    padding: .5rem;
    border-top: 1px solid var(--cs-border);
    background: #fff;
}

.cs-sticky-btn {
    border: 1px solid var(--cs-text);
    padding: .6rem .9rem;
    border-radius: .5rem;
    color: var(--cs-text);
    background: #fff
}

.cs-sticky-btn:hover {
    background: #111827;
    color: #fff;
    text-decoration: none
}

@media (min-width: 841px) {
    .cs-sticky-contact {
        display: none
    }
}

/* Accessibility */
.screen-reader-text {
    position: absolute;
    left: -10000px;
    top: auto;
    width: 1px;
    height: 1px;
    overflow: hidden
}

.screen-reader-text:focus {
    position: static;
    width: auto;
    height: auto
}