/* ===== Guardline — modern security blog theme ===== */
:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-2: #f0f2f8;
  --text: #121726;
  --muted: #5b6478;
  --border: #e5e8f0;
  --primary: #4f46e5;
  --primary-2: #7c3aed;
  --accent: #06b6d4;
  --accent-2: #10b981;
  --ring: rgba(79,70,229,.35);
  --shadow: 0 10px 30px rgba(18,23,38,.08);
  --shadow-lg: 0 24px 60px rgba(18,23,38,.14);
  --radius: 18px;
  --radius-sm: 12px;
  --maxw: 1160px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: "Space Grotesk", var(--font-sans);
}
:root[data-theme="dark"] {
  --bg: #0b0e1a;
  --surface: #121627;
  --surface-2: #1a1f33;
  --text: #eef1f8;
  --muted: #9aa3bd;
  --border: #242a40;
  --primary: #8b85ff;
  --primary-2: #a78bfa;
  --accent: #22d3ee;
  --accent-2: #34d399;
  --ring: rgba(139,133,255,.4);
  --shadow: 0 10px 30px rgba(0,0,0,.4);
  --shadow-lg: 0 24px 60px rgba(0,0,0,.55);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-2); }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

h1,h2,h3,h4 { font-family: var(--font-display); line-height: 1.15; font-weight: 700; letter-spacing: -.02em; }

/* ===== Nav ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 1.2rem; color: var(--text); }
.brand .logo {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  display: grid; place-items: center; color: #fff; font-size: 16px;
  box-shadow: 0 6px 16px var(--ring);
}
.brand:hover { color: var(--text); }
.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a { color: var(--muted); font-weight: 500; font-size: .95rem; padding: 8px 14px; border-radius: 10px; transition: all .15s; }
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--surface-2); }
.theme-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer; font-size: 16px;
  display: grid; place-items: center; transition: all .15s;
}
.theme-btn:hover { border-color: var(--primary); color: var(--primary); }
.nav-toggle { display: none; }

/* ===== Hero ===== */
.hero { position: relative; overflow: hidden; padding: 92px 0 72px; }
.hero::before {
  content: ""; position: absolute; inset: -40% -10% auto -10%; height: 680px; z-index: -1;
  background:
    radial-gradient(42% 55% at 20% 20%, color-mix(in srgb, var(--primary) 55%, transparent), transparent 60%),
    radial-gradient(40% 50% at 82% 15%, color-mix(in srgb, var(--accent) 50%, transparent), transparent 60%),
    radial-gradient(45% 55% at 60% 70%, color-mix(in srgb, var(--primary-2) 45%, transparent), transparent 62%);
  filter: blur(14px); opacity: .9;
}
.hero .eyebrow {
  display: inline-flex; align-items: center; gap: 8px; font-size: .8rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: .08em; color: var(--primary);
  background: color-mix(in srgb, var(--primary) 12%, transparent); padding: 6px 14px; border-radius: 999px;
  border: 1px solid color-mix(in srgb, var(--primary) 25%, transparent);
}
.hero h1 { font-size: clamp(2.2rem, 5.5vw, 4rem); margin: 20px 0 16px; max-width: 16ch; }
.hero p { font-size: 1.18rem; color: var(--muted); max-width: 56ch; margin: 0 0 30px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px; font-weight: 600; font-size: .98rem;
  padding: 13px 24px; border-radius: 12px; cursor: pointer; border: 1px solid transparent; transition: all .18s;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; box-shadow: 0 10px 24px var(--ring); }
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--primary); color: var(--primary); }

/* ===== Sections ===== */
.section { padding: 60px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 20px; margin-bottom: 34px; flex-wrap: wrap; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); margin: 0; }
.section-head p { color: var(--muted); margin: 6px 0 0; }

/* ===== Filters ===== */
.filters { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.chip {
  font-size: .85rem; font-weight: 600; color: var(--muted); background: var(--surface);
  border: 1px solid var(--border); padding: 8px 16px; border-radius: 999px; cursor: pointer; transition: all .15s;
}
.chip:hover { color: var(--text); border-color: var(--primary); }
.chip.active { background: var(--text); color: var(--bg); border-color: var(--text); }

/* ===== Cards ===== */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid.feature { grid-template-columns: 1.6fr 1fr 1fr; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  overflow: hidden; display: flex; flex-direction: column; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.card .cover { aspect-ratio: 16/9; position: relative; }
.card.big .cover { aspect-ratio: 16/10; }
.g1 { background: linear-gradient(135deg, #4f46e5, #06b6d4); }
.g2 { background: linear-gradient(135deg, #7c3aed, #ec4899); }
.g3 { background: linear-gradient(135deg, #0ea5e9, #10b981); }
.g4 { background: linear-gradient(135deg, #f59e0b, #ef4444); }
.g5 { background: linear-gradient(135deg, #6366f1, #a855f7); }
.g6 { background: linear-gradient(135deg, #14b8a6, #3b82f6); }
.g7 { background: linear-gradient(135deg, #ef4444, #f97316); }
.g8 { background: linear-gradient(135deg, #8b5cf6, #22d3ee); }
.g9 { background: linear-gradient(135deg, #0891b2, #4f46e5); }
.g10 { background: linear-gradient(135deg, #db2777, #9333ea); }
.cover .ico { position: absolute; inset: 0; display: grid; place-items: center; font-size: 2.6rem; opacity: .9; filter: drop-shadow(0 4px 10px rgba(0,0,0,.25)); }
.card .body { padding: 22px; display: flex; flex-direction: column; flex: 1; }
.pill {
  align-self: flex-start; font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .05em;
  color: var(--primary); background: color-mix(in srgb, var(--primary) 12%, transparent);
  padding: 5px 11px; border-radius: 999px; margin-bottom: 12px;
}
.card h3 { font-size: 1.22rem; margin: 0 0 8px; }
.card.big h3 { font-size: 1.6rem; }
.card h3 a { color: var(--text); }
.card h3 a:hover { color: var(--primary); }
.card .excerpt { color: var(--muted); font-size: .96rem; margin: 0 0 16px; flex: 1; }
.card .meta { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .84rem; margin-top: auto; }
.card .meta .dot { width: 3px; height: 3px; border-radius: 50%; background: var(--muted); }

/* ===== Newsletter ===== */
.cta {
  margin-top: 20px; border-radius: 24px; padding: 48px; text-align: center; color: #fff; position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
}
.cta::after { content:""; position:absolute; inset:0; background: radial-gradient(60% 120% at 80% -10%, rgba(255,255,255,.25), transparent 60%); }
.cta h2 { color: #fff; font-size: clamp(1.6rem,3vw,2.2rem); margin: 0 0 10px; position: relative; }
.cta p { color: rgba(255,255,255,.9); margin: 0 auto 24px; max-width: 48ch; position: relative; }
.cta form { display: flex; gap: 10px; max-width: 460px; margin: 0 auto; position: relative; flex-wrap: wrap; justify-content: center; }
.cta input { flex: 1; min-width: 220px; padding: 13px 18px; border-radius: 12px; border: none; font-size: .98rem; }
.cta .btn-light { background: #fff; color: var(--primary); }

/* ===== Article ===== */
.article-hero { padding: 56px 0 10px; }
.article-hero .wrap { max-width: 760px; margin: 0 auto; }
.breadcrumb { color: var(--muted); font-size: .88rem; margin-bottom: 18px; }
.breadcrumb a { color: var(--muted); }
.article-hero h1 { font-size: clamp(1.9rem, 4vw, 3rem); margin: 10px 0 16px; }
.article-meta { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: .9rem; }
.avatar { width: 38px; height: 38px; border-radius: 50%; background: linear-gradient(135deg,var(--primary),var(--accent)); display:grid; place-items:center; color:#fff; font-weight:700; font-size:.9rem; }
.article-cover { max-width: 900px; margin: 30px auto 0; height: 300px; border-radius: 20px; }
.article-body { max-width: 720px; margin: 0 auto; padding: 44px 0 20px; font-size: 1.1rem; }
.article-body > p:first-of-type::first-letter { }
.article-body p { margin: 0 0 20px; }
.article-body h2 { font-size: 1.6rem; margin: 40px 0 14px; }
.article-body h3 { font-size: 1.25rem; margin: 28px 0 10px; }
.article-body ul, .article-body ol { margin: 0 0 20px; padding-left: 24px; }
.article-body li { margin: 8px 0; }
.article-body a { text-decoration: underline; text-underline-offset: 3px; }
.article-body blockquote {
  margin: 28px 0; padding: 18px 24px; border-left: 4px solid var(--primary);
  background: var(--surface-2); border-radius: 0 14px 14px 0; color: var(--text); font-size: 1.08rem;
}
.callout {
  margin: 28px 0; padding: 20px 24px; border-radius: 16px; border: 1px solid var(--border);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface)); display: flex; gap: 14px;
}
.callout .ic { font-size: 1.4rem; }
.callout strong { display: block; margin-bottom: 4px; }
.tags { display: flex; gap: 10px; flex-wrap: wrap; max-width: 720px; margin: 10px auto 0; }
.tag { font-size: .82rem; color: var(--muted); background: var(--surface-2); padding: 6px 14px; border-radius: 999px; }
.article-nav { max-width: 720px; margin: 40px auto 0; display: flex; justify-content: space-between; gap: 16px; }

/* ===== Page ===== */
.page { max-width: 760px; margin: 0 auto; padding: 56px 0; }
.page h1 { font-size: clamp(2rem,4vw,2.8rem); margin: 0 0 20px; }
.page p { color: var(--muted); font-size: 1.08rem; }
.page h2 { margin: 32px 0 12px; }

/* ===== Footer ===== */
.footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 60px; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 30px; padding: 52px 0 36px; }
.footer .brand { margin-bottom: 12px; }
.footer p { color: var(--muted); font-size: .94rem; max-width: 32ch; }
.footer h4 { font-size: .8rem; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 0 0 14px; }
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer ul li { margin: 9px 0; }
.footer ul a { color: var(--text); font-size: .94rem; font-weight: 500; }
.footer ul a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid var(--border); padding: 20px 0; display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: .88rem; flex-wrap: wrap; gap: 10px; }

/* ===== Responsive ===== */
@media (max-width: 920px) {
  .grid, .grid.feature { grid-template-columns: repeat(2, 1fr); }
  .grid.feature .card.big { grid-column: 1 / -1; }
  .footer-top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .grid, .grid.feature { grid-template-columns: 1fr; }
  .nav-links { position: fixed; inset: 66px 0 auto 0; flex-direction: column; background: var(--surface); border-bottom: 1px solid var(--border); padding: 12px; gap: 4px; display: none; }
  .nav-links.open { display: flex; }
  .nav-links a { width: 100%; }
  .nav-toggle { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border); background: var(--surface); color: var(--text); cursor: pointer; }
  .footer-top { grid-template-columns: 1fr; }
  .cta { padding: 32px 20px; }
}