:root {
  --bg:          #ffffff;
  --surface:     #f7f7f6;
  --surface2:    #efefed;
  --border:      #e4e4e1;
  --accent:      #2a5bd4;
  --accent-dim:  #eef2fc;
  --text:        #18181b;
  --text-muted:  #6b6b6b;
  --radius:      10px;
  --max-w:       1100px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(255,255,255,0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-weight: 700;
  font-size: 15px;
  color: var(--text);
}
.nav-logo .logo-box {
  width: 34px; height: 34px;
  background: var(--accent);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  letter-spacing: -0.5px;
}
.nav-logo span { line-height: 1.2; }
.nav-logo small { display: block; font-weight: 400; font-size: 11px; color: var(--text-muted); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
}
.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 500;
  padding: 6px 14px;
  border-radius: 6px;
  transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--accent); }
.nav-links .btn-nav {
  background: var(--accent);
  color: #fff !important;
  padding: 7px 16px;
  border-radius: 8px;
}
.nav-links .btn-nav:hover { background: #1e4bbf; }

/* hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.nav-hamburger span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: .2s;
}

/* ── CONTAINER ── */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 13px 24px;
  border-radius: 9px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all .15s;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: #1e4bbf; }
.btn-outline { background: transparent; color: var(--text); border: 1.5px solid var(--border); }
.btn-outline:hover { border-color: var(--text); background: var(--surface); }
.btn-white { background: #fff; color: var(--text); }
.btn-white:hover { background: #f0f0f0; }
.btn-outline-white { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,0.4); }
.btn-outline-white:hover { border-color: #fff; background: rgba(255,255,255,0.08); }

/* ── SECTION DEFAULTS ── */
section { padding: 96px 0; }
section.alt { background: var(--surface); }
section.dark { background: var(--text); }

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.1;
  color: var(--text);
  margin-bottom: 16px;
}
.section-sub {
  font-size: 17px;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 560px;
}
.section-header { text-align: center; margin-bottom: 56px; }
.section-header .section-sub { margin: 0 auto; }

/* ── FADE UP ── */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .5s ease, transform .5s ease;
}
.fade-up.visible { opacity: 1; transform: none; }

/* ── FOOTER ── */
footer {
  background: var(--text);
  color: rgba(255,255,255,0.5);
  padding: 40px 0;
  font-size: 13px;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-inner a { color: rgba(255,255,255,0.5); text-decoration: none; }
.footer-inner a:hover { color: #fff; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .nav-links { display: none; flex-direction: column; position: absolute; top: 60px; left: 0; right: 0; background: #fff; border-bottom: 1px solid var(--border); padding: 12px 16px; }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
  .container { padding: 0 24px; }
  section { padding: 64px 0; }
  .footer-inner { flex-direction: column; text-align: center; }
}
@media (max-width: 420px) {
  .nav-inner { padding: 0 16px; }
}