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

html {
  scroll-behavior: smooth;
}

body {
  overflow-x: hidden;
}

/* ─── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg, #080c10);
}

::-webkit-scrollbar-thumb {
  background: var(--border, #21262d);
  border-radius: 3px;
}

/* ─── Navigation ──────────────────────────────────────────── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h, 64px);
  background: rgba(8, 12, 16, 0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
}

.nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text);
}

.nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
  align-items: center;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

/* ─── Nav dot pulse animation ─────────────────────────────── */
@keyframes pulse {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.3);
  }
}

/* ─── Hamburger ───────────────────────────────────────────── */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--muted);
  border-radius: 2px;
  transition: all 0.3s ease;
}

.hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
  opacity: 0;
}
.hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── Nav drawer ──────────────────────────────────────────── */
.nav-drawer {
  display: none;
  position: fixed;
  top: var(--nav-h, 64px);
  left: 0;
  right: 0;
  background: rgba(8, 12, 16, 0.97);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  z-index: 99;
  padding: 12px 24px 24px;
  flex-direction: column;
  gap: 0;
}

.nav-drawer.open {
  display: flex;
}

.nav-drawer a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
  transition: color 0.2s;
}

.nav-drawer a:last-child {
  border-bottom: none;
}

.nav-drawer a:hover {
  color: var(--nav-accent, var(--teal, #39d0f0));
}

/* ─── Mobile ──────────────────────────────────────────────── */
@media (max-width: 840px) {
  nav {
    padding: 0 20px;
  }

  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }
}

/* ─── Nav active link ─────────────────────────────────────── */
.nav-links a.active {
  color: var(--nav-accent, var(--teal, #39d0f0));
}

/* ─── Nav dot (generic — color driven by --nav-accent) ───── */
.nav-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--nav-accent, var(--teal, #39d0f0));
  display: inline-block;
  animation: pulse 2s infinite;
}

/* ─── Scroll reveal ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition:
    opacity 0.58s ease,
    transform 0.58s ease;
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ─── Scroll-to-top button ────────────────────────────────── */
.scroll-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  z-index: 60;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--surface2, #1c2230);
  border: 1px solid var(--border, #21262d);
  color: var(--muted, #7d8590);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.05rem;
  line-height: 1;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.3s,
    background 0.2s,
    color 0.2s,
    transform 0.22s,
    border-color 0.2s;
  font-family: inherit;
}

.scroll-top.show {
  opacity: 1;
  pointer-events: auto;
}

.scroll-top:hover {
  background: var(--nav-accent, var(--teal, #39d0f0));
  border-color: transparent;
  color: #000;
  transform: translateY(-3px);
}

/* ─── Focus outline ────────────────────────────────────────────────── */
:focus-visible {
  outline: 2px solid var(--nav-accent, var(--teal, #39d0f0));
  outline-offset: 3px;
}

/* ─── Footer note ───────────────────────────────────────────────────── */
.footer-note {
  margin-top: 4px;
}