/* Base reset (lightweight) */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&family=IBM+Plex+Sans:wght@400;600;700&display=swap');

:root {
  --font-ui: "IBM Plex Sans", Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --font-content: "IBM Plex Sans", Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  --bg: #ffffff;
  --text: #0f172a;          /* slate-900 */
  --muted: #475569;         /* slate-600 */
  --card: #ffffff;
  --border: #e2e8f0;        /* slate-200 */
  --primary: #0ea5e9;       /* sky-500 */
  --primary-600: #0284c7;   /* sky-600 */
  --surface: #f1f5f9;       /* slate-100-ish, slightly more blue/gray */
  --shadow: 0 1px 2px rgba(0,0,0,0.06), 0 4px 12px rgba(0,0,0,0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --card: #0f172a;
    --border: #1f2937;
    --primary: #38bdf8;
    --primary-600: #0ea5e9;
    --surface: #0b1220;
    --shadow: 0 1px 2px rgba(0,0,0,0.4), 0 6px 18px rgba(0,0,0,0.35);
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font-content);
  line-height: 1.7;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    linear-gradient(to bottom, rgba(11, 18, 32, 0.30), rgba(11, 18, 32, 0.20) 30%, rgba(11, 18, 32, 0.20) 70%, rgba(11, 18, 32, 0.30)),
    url('images/lake_background.jpg');
  background-position: center top, center;
  background-repeat: no-repeat, no-repeat;
  background-size: auto 100%, cover;
  background-attachment: scroll, fixed;
  text-rendering: optimizeLegibility;
}
::selection { background: rgba(14,165,233,0.18); }

/* Layout helpers */
.container { width: min(1040px, 92%); margin-inline: auto; }
.section { padding: 4.5rem 0; }

/* Header and nav */
.site-header { position: sticky; top: 0; background: var(--surface); backdrop-filter: saturate(180%) blur(8px); border-bottom: 1px solid var(--border); z-index: 10; }
.nav { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.9rem min(1040px, 4%); margin-inline: auto; }
.nav__brand { display: inline-flex; align-items: center; gap: 0.6rem; font-weight: 700; text-decoration: none; color: var(--text); letter-spacing: 0.2px; font-family: var(--font-ui); }
.brand-mark { display: inline-flex; width: 52px; height: 30px; }
.nav__brand { gap: 0.7rem; }
.brand-text { line-height: 1; font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; font-weight: 400; letter-spacing: 0.1px; }
.nav__list { display: flex; gap: 0.25rem; list-style: none; margin: 0; padding: 0; }
.nav__list a { text-decoration: none; color: var(--text); padding: 0.5rem 0.7rem; border-radius: 8px; transition: background-color .2s ease, color .2s ease, transform .15s ease; font-family: var(--font-ui); }
.nav__list a:hover, .nav__list a:focus-visible { background: color-mix(in oklab, var(--border) 60%, transparent); outline: none; }
.nav__list a[aria-current="page"] { background: color-mix(in oklab, var(--border) 85%, transparent); font-weight: 700; }

/* Hero */
.hero { margin-top: 1rem; padding: 2rem 1rem 1.5rem; background: linear-gradient(180deg, color-mix(in oklab, var(--primary) 12%, transparent) 0%, transparent 32%), var(--card); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); }
.hero h1 { font-family: var(--font-ui); font-size: clamp(2rem, 2.5vw + 1rem, 3.2rem); line-height: 1.15; margin: 0 0 0.6rem; letter-spacing: -0.02em; }
.lead { font-size: 1.125rem; color: var(--muted); margin: 0 0 1.1rem; }
.container h1, .container h2, .container h3, .container h4, .container h5, .container h6 { font-family: var(--font-ui); }
.hero__layout { display: grid; grid-template-columns: 128px 1fr; align-items: start; gap: 1rem; }
.hero__content { min-width: 0; }
.avatar { width: 128px; height: 128px; border-radius: 50%; object-fit: cover; border: 2px solid color-mix(in oklab, var(--border) 80%, transparent); box-shadow: var(--shadow); }
@media (max-width: 640px) { .hero__layout { grid-template-columns: 1fr; } .avatar { width: 96px; height: 96px; } }
.cta { display: flex; gap: 0.75rem; flex-wrap: wrap; }

/* Buttons */
.button { display: inline-block; padding: 0.65rem 1rem; border-radius: 10px; background: var(--primary); color: white; text-decoration: none; font-weight: 650; box-shadow: var(--shadow); transition: transform .15s ease, background-color .2s ease, box-shadow .2s ease; font-family: var(--font-ui); }
.button:hover, .button:focus-visible { background: var(--primary-600); transform: translateY(-1px); }
.button--secondary { background: color-mix(in oklab, var(--border) 85%, transparent); color: var(--text); }
.button--secondary:hover, .button--secondary:focus-visible { background: color-mix(in oklab, var(--border) 95%, transparent); }

/* Cards */
.card-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.25rem; padding: 0; list-style: none; }
.card { border: 1px solid var(--border); border-radius: 14px; padding: 1.1rem; background: var(--card); box-shadow: var(--shadow); transition: transform .18s ease, box-shadow .2s ease, border-color .2s ease; }
.card:hover, .card:focus-within { transform: translateY(-3px); box-shadow: 0 2px 6px rgba(0,0,0,0.08), 0 10px 24px rgba(0,0,0,0.08); border-color: color-mix(in oklab, var(--primary) 35%, var(--border)); }
.card h3 { margin-top: 0; margin-bottom: 0.35rem; letter-spacing: -0.01em; font-family: var(--font-ui); }
.text-link { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
.text-link:hover, .text-link:focus-visible { color: var(--primary-600); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 3rem; }
.site-footer p { margin: 0; padding: 1rem 0; color: color-mix(in oklab, var(--muted) 90%, var(--text)); text-align: center; }

/* Focus styles */
:focus-visible { outline: 2px solid color-mix(in oklab, var(--primary) 60%, transparent); outline-offset: 2px; border-radius: 10px; }

/* Accessibility prefers-reduced-motion */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}