/* VocaVoIP blog — shared styles (brand tokens mirror the marketing site) */
:root {
  --blue: #2563eb; --blue-light: #3b82f6; --navy: #1e3a8a;
  --ink: #0b1020; --bg: #ffffff; --bg-soft: #f5f7fb; --text: #16203a; --muted: #5a6785;
  --card: #ffffff; --line: #e4e9f2; --radius: 14px;
  --grad: linear-gradient(90deg, #3b82f6, #2563eb 45%, #1e3a8a);
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #070b16; --bg-soft: #0c1324; --text: #e6ebf6; --muted: #93a0bd; --card: #0e1626; --line: #1e293f; }
}
:root[data-theme="light"] { --bg:#fff; --bg-soft:#f5f7fb; --text:#16203a; --muted:#5a6785; --card:#fff; --line:#e4e9f2; }
:root[data-theme="dark"]  { --bg:#070b16; --bg-soft:#0c1324; --text:#e6ebf6; --muted:#93a0bd; --card:#0e1626; --line:#1e293f; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text); background: var(--bg); line-height: 1.7; -webkit-font-smoothing: antialiased; }
a { color: var(--blue); text-decoration: none; } a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.wrap { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 1.25rem; }

/* Header (mirrors marketing site) */
header.nav { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; gap: 1rem; height: 66px; }
.brand { display: flex; align-items: center; gap: .5rem; font-weight: 800; font-size: 1.25rem; letter-spacing: -.02em; color: var(--text); }
.brand:hover { text-decoration: none; } .brand img { height: 32px; width: 32px; }
.brand .voca { color: var(--blue); } .brand .voip { color: var(--text); }
@media (prefers-color-scheme: dark){ .brand .voip { color: #cdd8f0; } }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 1.5rem; }
.nav-links a { color: var(--muted); font-weight: 600; font-size: .95rem; }
.nav-links a:hover { color: var(--text); text-decoration: none; }
.btn { display: inline-block; padding: .7rem 1.3rem; border-radius: 10px; font-weight: 700; cursor: pointer; border: 0; }
.btn-primary { background: var(--grad); color: #fff; box-shadow: 0 8px 24px #2563eb44; } .btn-primary:hover { text-decoration:none; filter: brightness(1.08); }
@media (max-width: 760px) { .nav-links .hide-sm { display: none; } }

/* Blog index */
.blog-hero { padding: clamp(2.5rem,6vw,4rem) 0 1.5rem; }
.eyebrow { text-transform: uppercase; letter-spacing: .12em; font-size: .74rem; font-weight: 700; color: var(--blue); }
h1 { line-height: 1.12; letter-spacing: -.02em; font-size: clamp(1.9rem, 5vw, 2.9rem); margin: .3rem 0 .5rem; }
.blog-hero p { color: var(--muted); font-size: 1.1rem; max-width: 42rem; margin: 0; }
.post-list { display: grid; gap: 1.1rem; grid-template-columns: repeat(auto-fit, minmax(300px,1fr)); padding: 1.5rem 0 4rem; }
.post-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.5rem; transition: border-color .15s, transform .15s; }
.post-card:hover { border-color: var(--blue); transform: translateY(-3px); }
.post-card a { text-decoration: none; }
.post-card .cat { font-size: .72rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--blue); }
.post-card h2 { font-size: 1.2rem; line-height: 1.25; margin: .4rem 0 .5rem; color: var(--text); letter-spacing: -.01em; }
.post-card p { color: var(--muted); margin: 0 0 .8rem; font-size: .95rem; }
.post-card .meta { color: var(--muted); font-size: .8rem; }

/* Article */
article.post { padding: clamp(2rem,5vw,3.5rem) 0 4rem; }
article.post .post-head { max-width: 44rem; margin: 0 auto 2rem; }
article.post .crumb { font-size: .85rem; color: var(--muted); margin-bottom: 1rem; }
article.post h1 { font-size: clamp(1.8rem, 4.5vw, 2.7rem); }
article.post .byline { color: var(--muted); font-size: .9rem; margin-top: .6rem; }
.post-body { max-width: 44rem; margin: 0 auto; font-size: 1.06rem; }
.post-body h2 { font-size: 1.5rem; letter-spacing: -.01em; margin: 2.2rem 0 .6rem; line-height: 1.2; }
.post-body h3 { font-size: 1.18rem; margin: 1.6rem 0 .4rem; }
.post-body p, .post-body li { color: var(--text); }
.post-body ul, .post-body ol { padding-left: 1.3rem; }
.post-body li { margin-bottom: .5rem; }
.post-body table { width: 100%; border-collapse: collapse; margin: 1.2rem 0; font-size: .95rem; overflow-x: auto; display: block; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: .55rem .7rem; text-align: left; }
.post-body th { background: var(--bg-soft); font-weight: 700; }
.post-body blockquote { border-left: 3px solid var(--blue); margin: 1.4rem 0; padding: .3rem 0 .3rem 1.1rem; color: var(--muted); font-style: italic; }
.callout { background: var(--bg-soft); border: 1px solid var(--line); border-radius: 12px; padding: 1.1rem 1.3rem; margin: 1.6rem 0; }
.cta-band { background: var(--bg-soft); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); text-align: center; padding: 2.5rem 0; margin: 2.5rem 0 0; }
.cta-band h2 { margin: 0 0 .3rem; } .cta-band p { color: var(--muted); margin: 0 0 1.2rem; }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 2rem 0; }
.foot-inner { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; justify-content: space-between; color: var(--muted); font-size: .9rem; }
.foot-brand { display: flex; align-items: center; gap: .5rem; font-weight: 700; color: var(--text); }
.foot-brand img { height: 26px; width: 26px; } .foot-brand .voca { color: var(--blue); }