:root {
  --bg:           #ffffff;
  --bg-soft:      #f7f8f7;
  --surface:      #ffffff;
  --ink:          #343c3e;
  --ink-soft:     #6b7475;
  --ink-faint:    #b2babb;
  --green:        #13b663;
  --green-dark:   #0e9451;
  --green-light:  #e8f9f0;
  --border:       #e4e8e8;
  --surface-dark-rgb: 36, 44, 45;
  --surface-dark: rgb(var(--surface-dark-rgb));
  --border-dark:  #2e3839;
  --text-on-dark: #7a8586;
  --text-on-dark-muted: #4a5557;
  --header-text-on-dark: #a8b0b1;
  --mono:         'DM Mono', monospace;
  --sans:         'Montserrat', sans-serif;
  --radius:       4px;
  --max:          1080px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* NAV */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(var(--surface-dark-rgb), 0.93);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-dark);
}
.nav-inner {
  max-width: var(--max); margin: 0 auto; padding: 0 2rem;
  height: 64px; display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 0.55rem; text-decoration: none; }
.logo-mark { width: 30px; height: 30px; flex-shrink: 0; }
.logo-word { font-family: var(--sans); font-weight: 700; font-size: 1.1rem; letter-spacing: 0.1em; color: var(--header-text-on-dark); text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 2.2rem; list-style: none; }
.nav-links a { font-family: var(--sans); font-size: 0.68rem; font-weight: 600; letter-spacing: 0.1em; text-transform: uppercase; color: var(--header-text-on-dark); text-decoration: none; transition: color 0.2s; }
.nav-links a:hover { color: var(--green); }
.lang-switch { display: flex; gap: 0.3rem; margin-left: 1.2rem; }
.lang-btn { font-family: var(--sans); font-size: 0.63rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; background: none; border: 1.5px solid var(--border-dark); color: var(--header-text-on-dark); padding: 0.22rem 0.55rem; border-radius: var(--radius); cursor: pointer; transition: all 0.2s; }
.lang-btn.active, .lang-btn:hover { background: var(--green); border-color: var(--green); color: #fff; }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; background: none; border: none; padding: 4px; }
.hamburger span { display: block; width: 22px; height: 1.5px; background: var(--header-text-on-dark); transition: all 0.3s; }

/* FOOTER */
footer { background: var(--surface-dark); border-top: 1px solid var(--border-dark); padding: 1.6rem 2rem; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }
.footer-logo { display: flex; align-items: center; gap: 0.45rem; text-decoration: none; }
.footer-logo svg { width: 20px; height: 20px; }
.footer-logo span { font-family: var(--sans); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-on-dark); }
.footer-copy, .footer-right { font-size: 0.68rem; color: var(--text-on-dark-muted); font-family: var(--sans); }

/* MOBILE */
@media (max-width: 860px) {
  .nav-links { display: none; flex-direction: column; position: fixed; top: 64px; left: 0; right: 0; background: var(--surface-dark); padding: 1.5rem 2rem; border-bottom: 1px solid var(--border-dark); gap: 1.2rem; z-index: 99; }
  .nav-links.open { display: flex; }
  .hamburger { display: flex; }
  footer { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
}