/* ====== Particle Background ====== */
#particles {
  position: fixed; top: 0; left: 0; width: 100%; height: 100%;
  z-index: 0; pointer-events: none;
}

/* ====== Navigation ====== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 1rem 0; transition: all .4s ease;
  background: rgba(10,22,40,.5);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
}
.nav.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  padding: 1rem 0;
}
.nav-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 2rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo {
  display: flex; align-items: center; gap: .75rem;
  text-decoration: none; color: var(--text);
}
.nav-logo-icon {
  width: 42px; height: 42px; border-radius: 12px;
  background: var(--gradient-1); display: flex;
  align-items: center; justify-content: center;
  font-weight: 900; font-size: 1.1rem; color: #000;
}
.nav-logo-text { font-size: 1.15rem; font-weight: 700; letter-spacing: 1px; }
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  color: var(--text-dim); text-decoration: none; font-size: .9rem;
  font-weight: 400; transition: color .3s; position: relative;
  white-space: nowrap;
}
.nav-logo-text { white-space: nowrap; }
.nav-links a:hover { color: var(--accent); }
.nav-links a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 2px; background: var(--accent);
  transition: width .3s;
}
.nav-links a:hover::after { width: 100%; }
.nav-cta {
  padding: .6rem 1.5rem; font-size: .85rem;
  background: var(--gradient-1); color: #000;
  border-radius: 50px; text-decoration: none;
  font-weight: 600; transition: all .3s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 4px 20px rgba(0,212,170,.3); }
.nav-toggle { display: none; background: none; border: none; cursor: pointer; }
.nav-toggle span {
  display: block; width: 24px; height: 2.5px; background: var(--text);
  margin: 5px 0; transition: all .3s; border-radius: 2px;
}

/* ====== Scroll Top Button ====== */
.scroll-top {
  position: fixed;
  right: 1rem;
  bottom: 1rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: rgba(10,22,40,.85);
  color: var(--text);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  z-index: 1200;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity .2s ease, transform .2s ease, visibility 0s linear .2s;
}
.scroll-top.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0);
  transition: opacity .2s ease, transform .2s ease;
}
.scroll-top:hover {
  background: var(--gradient-1);
  color: #000;
  border-color: transparent;
}
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 1100;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .2s ease, visibility 0s linear .2s;
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity .2s ease;
}
.mobile-menu-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8,18,34,.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.mobile-menu-panel {
  position: relative;
  width: min(560px, calc(100% - 2rem));
  margin: max(1rem, env(safe-area-inset-top)) auto 0;
  border-radius: 18px;
  background: var(--mobile-nav-solid);
  border: 1px solid var(--glass-border);
  padding: 4rem 1rem 1.25rem;
  box-shadow: 0 20px 60px rgba(0,0,0,.45);
}
.mobile-menu-close {
  position: absolute;
  top: .9rem;
  right: .9rem;
  width: 40px;
  height: 40px;
  border: 0;
  border-radius: 10px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  cursor: pointer;
}
.mobile-menu-close span {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: var(--text);
}
.mobile-menu-close span:first-child { transform: translate(-50%, -50%) rotate(45deg); }
.mobile-menu-close span:last-child { transform: translate(-50%, -50%) rotate(-45deg); }
.mobile-menu-links {
  list-style: none;
  margin: 0;
  padding: 0;
}
.mobile-menu-links li { text-align: center; }
.mobile-menu-links a {
  display: block;
  text-decoration: none;
  color: var(--text-dim);
  font-size: 1.35rem;
  font-weight: 500;
  padding: 1rem;
  border-bottom: 1px solid var(--glass-border);
}
.mobile-menu-links a:active { color: var(--accent); }
.mobile-menu-cta {
  display: block;
  text-align: center;
  margin-top: 1rem;
  padding: .95rem 1rem;
  border-radius: 999px;
  text-decoration: none;
  background: var(--gradient-1);
  color: #000;
  font-weight: 700;
}

/* ====== Theme Toggle ====== */
.theme-toggle {
  position: relative;
  width: 60px; height: 30px; border-radius: 50px;
  background: linear-gradient(135deg, #0d1b2a, #1b2d4a);
  border: 1px solid rgba(255,255,255,.1);
  cursor: pointer;
  transition: background .6s ease, border-color .4s ease, box-shadow .4s ease;
  flex-shrink: 0; padding: 0;
  outline: none; overflow: hidden;
}
.theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: 0 0 20px rgba(0,212,170,.12);
}
[data-theme="light"] .theme-toggle {
  background: linear-gradient(135deg, #ffecd2, #fcb69f);
  border-color: rgba(200,120,50,.15);
}
[data-theme="light"] .theme-toggle:hover {
  border-color: #f5a623;
  box-shadow: 0 0 20px rgba(245,166,35,.2);
}

/* SVG icon inside toggle */
.theme-toggle .toggle-icon {
  position: absolute;
  top: 0; left: 0;
  width: 60px; height: 30px;
  transition: transform .55s cubic-bezier(.68,-.55,.27,1.55);
  z-index: 2;
}
[data-theme="light"] .theme-toggle .toggle-icon {
  transform: translateX(0);
}

/* Moon SVG */
.toggle-icon .icon-moon-wrap {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  transition: opacity .35s ease, transform .35s ease;
}
.toggle-icon .icon-sun-wrap {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(.6);
  opacity: 0;
  transition: opacity .35s ease, transform .35s ease;
}
[data-theme="light"] .toggle-icon .icon-moon-wrap {
  opacity: 0;
  transform: translate(-50%, -50%) scale(.6) rotate(-90deg);
}
[data-theme="light"] .toggle-icon .icon-sun-wrap {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1) rotate(0deg);
}

/* Sun rays rotation */
.toggle-icon .icon-sun-wrap svg {
  animation: none;
}
[data-theme="light"] .toggle-icon .icon-sun-wrap svg {
  animation: sunSpin 12s linear infinite;
}
@keyframes sunSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Stars floating in dark track */
.toggle-stars {
  position: absolute; inset: 0;
  border-radius: 50px; overflow: hidden;
  z-index: 1; pointer-events: none;
  transition: opacity .5s ease;
}
.toggle-stars .star {
  position: absolute;
  border-radius: 50%;
  background: rgba(255,255,255,.8);
  animation: twinkle 2s ease-in-out infinite alternate;
}
.toggle-stars .star:nth-child(1) { width: 2px; height: 2px; top: 6px; left: 8px; animation-delay: 0s; }
.toggle-stars .star:nth-child(2) { width: 1.5px; height: 1.5px; top: 18px; left: 18px; animation-delay: .5s; opacity: .5; }
.toggle-stars .star:nth-child(3) { width: 2px; height: 2px; top: 8px; left: 38px; animation-delay: 1s; }
.toggle-stars .star:nth-child(4) { width: 1px; height: 1px; top: 20px; left: 48px; animation-delay: 1.5s; opacity: .4; }
.toggle-stars .star:nth-child(5) { width: 1.5px; height: 1.5px; top: 10px; left: 28px; animation-delay: .7s; opacity: .6; }
@keyframes twinkle {
  0% { opacity: .3; transform: scale(.8); }
  100% { opacity: 1; transform: scale(1.2); }
}
[data-theme="light"] .toggle-stars {
  opacity: 0;
}