.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  transition: transform 0.4s cubic-bezier(0.22,1,0.36,1), background 0.3s, box-shadow 0.3s;
}
.site-header.hidden  { transform: translateY(-100%); }
.site-header.visible { transform: translateY(0); }

.navbar {
  padding: 0.875rem 0;
  background: rgba(10,14,20,0);
  transition: background 0.3s, backdrop-filter 0.3s, border-color 0.3s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled .navbar {
  background: rgba(10,14,20,0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--clr-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-brand {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}
.brand-img {
  display: block;
  height: 34px;
  width: auto;
  flex-shrink: 0;
  transition: opacity 0.2s ease, transform 0.35s var(--ease-spring);
  user-select: none;
}
.brand-img-sm {
  height: 27px;
}
.brand-img-dark { display: none; }
[data-theme="dark"] .brand-img-light { display: none; }
[data-theme="dark"] .brand-img-dark { display: block; }
.nav-brand:hover .brand-img { opacity: 0.88; transform: scale(1.03); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin: 0 auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.5rem 0.875rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--clr-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-body);
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover, .nav-link.active { color: var(--clr-text); background: rgba(255,255,255,0.05); }
.nav-link.active { color: var(--clr-accent); }

.nav-tag {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--clr-accent);
  background: rgba(30,155,255,0.12);
  border: 1px solid rgba(30,155,255,0.25);
  border-radius: 999px;
  padding: 0.1rem 0.4rem;
  line-height: 1.4;
}
.mobile-nav-links .nav-tag {
  font-size: 0.62rem;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.nav-external-icon {
  color: var(--clr-text-dim);
  opacity: 0.8;
  flex-shrink: 0;
}
.nav-link:hover .nav-external-icon,
.footer-links-col a:hover .nav-external-icon {
  color: var(--clr-accent);
  opacity: 1;
}

.dropdown-chevron {
  transition: transform 0.25s;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
}
.nav-dropdown-wrap.open .dropdown-chevron { transform: rotate(180deg); }

.nav-dropdown-wrap { position: relative; }

.nav-dropdown {
  position: absolute;
  top: calc(100% + 0.75rem);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  min-width: 260px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-lg);
  padding: 0.5rem;
  box-shadow: var(--shadow-deep);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s, transform 0.2s;
}
.nav-dropdown-wrap.open .nav-dropdown {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  transition: background 0.2s, color 0.2s;
}
.dropdown-item:hover {
  background: var(--clr-surface-2);
  color: var(--clr-text);
}
.dropdown-icon {
  font-size: 1.25rem;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--clr-surface-2);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}
.dropdown-item strong { display: block; font-size: 0.875rem; color: var(--clr-text); margin-bottom: 0.1rem; }
.dropdown-item small  { font-size: 0.775rem; }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  margin-left: auto;
}

.streak-pill {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  background: rgba(30,155,255,0.1);
  border: 1px solid rgba(30,155,255,0.25);
  color: var(--clr-accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.8rem;
  line-height: 1;
  transition: transform 0.2s, background 0.2s;
  flex-shrink: 0;
}
.streak-pill:hover { transform: translateY(-1px); background: rgba(30,155,255,0.18); }
.streak-pill svg { flex-shrink: 0; }
.streak-pill .streak-label { color: var(--clr-text-muted); font-weight: 500; }
.streak-pill-zero {
  color: var(--clr-text-muted);
  background: var(--clr-surface-2);
  border-color: var(--clr-border-2);
}
.streak-pill-zero .streak-label { color: var(--clr-text-muted); }
.streak-pill-risk {
  color: #ffb020;
  background: rgba(255,176,32,0.12);
  border-color: rgba(255,176,32,0.35);
  animation: streakPillPulse 2s ease-in-out infinite;
}
.streak-pill-risk .streak-label { color: #ffb020; }
@keyframes streakPillPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255,176,32,0.35); }
  50%      { box-shadow: 0 0 0 5px rgba(255,176,32,0); }
}
@media (max-width: 900px) {
  .streak-pill .streak-label { display: none; }
  .streak-pill { padding: 0.4rem 0.55rem; }
}

.mobile-streak {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin: 0 1.25rem 1.25rem;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-md);
  background: rgba(30,155,255,0.1);
  border: 1px solid rgba(30,155,255,0.25);
  color: var(--clr-text);
  font-size: 0.875rem;
}
.mobile-streak svg { color: var(--clr-accent); flex-shrink: 0; }
.mobile-streak-risk { background: rgba(255,176,32,0.12); border-color: rgba(255,176,32,0.35); }
.mobile-streak-risk svg { color: #ffb020; }

.search-btn, .theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: none;
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.search-btn:hover, .theme-toggle:hover {
  border-color: var(--clr-accent);
  color: var(--clr-text);
  background: var(--clr-surface);
}

.icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 38px;
  height: 38px;
  padding: 9px;
  background: none;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  gap: 5px;
  order: 99; 
}
.nav-hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--clr-text-muted);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.2s ease, background 0.2s;
  transform-origin: center;
}
.nav-hamburger:hover span { background: var(--clr-text); }
.nav-hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  z-index: 9999;
  background: rgba(10,14,20,0.96);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 12vh;
  gap: 0.75rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  overflow-y: auto;
  overscroll-behavior: contain;
}
.search-overlay.open {
  opacity: 1;
  pointer-events: auto;
}
body.search-open {
  overflow: hidden;
}

.search-box {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: min(640px, 90vw);
  background: var(--clr-surface);
  border: 1px solid var(--clr-accent);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  box-shadow: var(--shadow-deep);
  transition: box-shadow 0.2s;
}
.search-box svg { color: var(--clr-accent); flex-shrink: 0; }
.search-box input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--clr-text);
}
.search-box input::placeholder { color: var(--clr-text-dim); }
.search-box kbd {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border-2);
  border-radius: 4px;
  color: var(--clr-text-muted);
  flex-shrink: 0;
}

.search-results {
  width: min(640px, 90vw);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.search-result-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  color: var(--clr-text-muted);
  transition: background 0.15s, color 0.15s;
  border-bottom: 1px solid var(--clr-border);
}
.search-result-item:last-child { border-bottom: none; }
.search-result-item:hover { background: var(--clr-surface-2); color: var(--clr-text); }
.search-result-item svg { flex-shrink: 0; color: var(--clr-accent); }
.search-result-item > span:nth-child(2) { flex: 1; font-size: 0.9rem; }
.search-result-tags { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.search-result-tags span {
  font-family: var(--font-mono);
  font-size: 0.675rem;
  padding: 0.15rem 0.5rem;
  background: var(--clr-surface-2);
  border-radius: 99px;
  color: var(--clr-text-dim);
}
.search-no-results {
  padding: 1.5rem 1.25rem;
  color: var(--clr-text-muted);
  font-size: 0.9rem;
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 900;
  background: var(--clr-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.mobile-menu.open { opacity: 1; pointer-events: auto; }

.mobile-nav-links { text-align: center; }
.mobile-nav-links li { opacity: 0; transform: translateY(16px); }
.mobile-menu.open .mobile-nav-links li {
  animation: mobileNavIn 0.4s var(--ease-out) forwards;
}
.mobile-menu.open .mobile-nav-links li:nth-child(1) { animation-delay: 0.05s; }
.mobile-menu.open .mobile-nav-links li:nth-child(2) { animation-delay: 0.10s; }
.mobile-menu.open .mobile-nav-links li:nth-child(3) { animation-delay: 0.15s; }
.mobile-menu.open .mobile-nav-links li:nth-child(4) { animation-delay: 0.20s; }
.mobile-menu.open .mobile-nav-links li:nth-child(5) { animation-delay: 0.25s; }
.mobile-menu.open .mobile-nav-links li:nth-child(6) { animation-delay: 0.30s; }

@keyframes mobileNavIn {
  to { opacity: 1; transform: translateY(0); }
}
.mobile-nav-links a {
  display: block;
  padding: 0.875rem 2rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--clr-text-muted);
  transition: color 0.2s;
}
.mobile-nav-links a:hover { color: var(--clr-accent); }

.site-footer {
  position: relative;
  background: var(--clr-bg-2);
  border-top: 1px solid var(--clr-border);
  padding: 4rem 0 2rem;
  overflow: hidden;
}
.footer-glow { display: none; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 1rem; }
.footer-tagline { font-size: 0.875rem; color: var(--clr-text-muted); line-height: 1.6; margin-bottom: 1.5rem; max-width: 320px; }

.footer-social { display: flex; gap: 0.75rem; }
.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  color: var(--clr-text-muted);
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
}
.social-link:hover { border-color: var(--clr-accent); color: var(--clr-accent); transform: translateY(-2px); }

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  margin-bottom: 1.1rem;
  position: relative;
  padding-bottom: 0.6rem;
}
.footer-col-title::before {
  content: '';
  position: absolute;
  left: 0; bottom: 0;
  width: 22px; height: 2px;
  background: var(--clr-accent);
  border-radius: 2px;
}
.footer-links-col ul { display: flex; flex-direction: column; gap: 0.7rem; }
.footer-links-col a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.875rem;
  color: var(--clr-text-muted);
  transition: color 0.2s, transform 0.2s;
  width: fit-content;
}
.footer-links-col a:hover { color: var(--clr-accent); transform: translateX(3px); }

.footer-divider { height: 1px; background: linear-gradient(90deg, transparent, var(--clr-border), transparent); margin-bottom: 1.5rem; }

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-copy, .footer-made { font-size: 0.8rem; color: var(--clr-text-dim); font-family: var(--font-mono); }

@media (max-width: 900px) {
  .nav-links    { display: none; }
  .nav-hamburger { display: flex; }
  .footer-grid  { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .nav-actions > .theme-toggle { display: none; }
}

.mobile-theme-toggle {
  width: auto;
  height: auto;
  margin: 1.25rem 1.25rem 0;
  padding: 0.8rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--clr-border-2);
  color: var(--clr-text-muted);
  font-size: 0.9rem;
  font-weight: 600;
}
.mobile-theme-toggle:hover {
  border-color: var(--clr-accent);
  color: var(--clr-text);
}
.mobile-theme-toggle-label { flex: 1; text-align: left; }
@media (max-width: 600px) {
  .site-footer { padding: 2.5rem 0 1.5rem; }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .footer-brand-col {
    padding-bottom: 1.5rem;
    margin-bottom: 0;
    border-bottom: 1px solid var(--clr-border);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
  .footer-tagline { max-width: 100%; margin-bottom: 1rem; }
  .footer-social { justify-content: center; }
  .footer-links-col {
    padding: 1rem 0;
    border-bottom: 1px solid var(--clr-border);
  }
  .footer-links-col:last-child { border-bottom: none; }
  .footer-col-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    margin-bottom: 0;
    padding: 0.25rem 0;
    user-select: none;
  }
  .footer-col-title::after {
    content: '';
    display: block;
    width: 10px; height: 10px;
    border-right: 2px solid var(--clr-text-dim);
    border-bottom: 2px solid var(--clr-text-dim);
    transform: rotate(45deg);
    transition: transform 0.25s;
    flex-shrink: 0;
  }
  .footer-col-title.open::after { transform: rotate(-135deg); }
  .footer-links-col ul {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, margin-top 0.3s ease;
    margin-top: 0;
  }
  .footer-links-col ul.open {
    max-height: 300px;
    margin-top: 0.75rem;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.375rem;
    margin-top: 1.25rem;
  }
}

@media (max-width: 900px) {
  .nav-inner {
    gap: 0.75rem;
  }
  .brand-img { height: 28px; }
  .nav-actions {
    margin-left: auto;
    gap: 0.4rem;
  }
}

.mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: auto;
  z-index: 900;
  background: rgba(10,14,20,0.97);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid var(--clr-border);
  padding: 4.5rem 1.5rem 1.75rem;
  display: block;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-12px);
  transition: opacity 0.25s ease, transform 0.25s ease;
}
.mobile-menu.open {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.mobile-nav-links {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.mobile-nav-links li {
  opacity: 0;
  transform: translateY(8px);
}
.mobile-menu.open .mobile-nav-links li {
  animation: mobileNavIn 0.35s var(--ease-out) forwards;
}
.mobile-menu.open .mobile-nav-links li:nth-child(1) { animation-delay: 0.04s; }
.mobile-menu.open .mobile-nav-links li:nth-child(2) { animation-delay: 0.08s; }
.mobile-menu.open .mobile-nav-links li:nth-child(3) { animation-delay: 0.12s; }
.mobile-menu.open .mobile-nav-links li:nth-child(4) { animation-delay: 0.16s; }
.mobile-menu.open .mobile-nav-links li:nth-child(5) { animation-delay: 0.20s; }
.mobile-nav-links a {
  display: flex;
  align-items: center;
  padding: 0.8rem 1rem;
  font-size: 1.05rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  color: var(--clr-text-muted);
  letter-spacing: -0.01em;
  transition: color 0.2s, background 0.2s, padding-left 0.2s;
}
.mobile-nav-links a:hover {
  color: var(--clr-accent);
  background: rgba(30,155,255,0.06);
  padding-left: 1.375rem;
}

.search-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--clr-text-dim);
  margin-bottom: 0.25rem;
}

@media (max-width: 600px) {
  .search-overlay { padding-top: 8vh; }
  .search-box { padding: 0.875rem 1rem; }
  .search-box kbd { display: none; }
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links { flex: 1; justify-content: center; }

@media (max-width: 900px) {
  .nav-inner { gap: 0; }
  .nav-brand { flex: 1; }
  .nav-actions { gap: 0.4rem; }
}

.mobile-menu-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-2);
  border-radius: var(--radius-sm);
  color: var(--clr-text-muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.mobile-menu-close:hover {
  background: rgba(255,80,80,0.1);
  border-color: rgba(255,80,80,0.3);
  color: #ff6b6b;
}

.search-overlay-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.875rem 0.45rem 0.625rem;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border-2);
  border-radius: 999px;
  color: var(--clr-text-muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, border-color 0.2s;
}
.search-overlay-close:hover {
  background: rgba(255,80,80,0.1);
  border-color: rgba(255,80,80,0.3);
  color: #ff6b6b;
}


.nav-auth-btn {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.15s;
  white-space: nowrap;
}
.nav-auth-login {
  color: var(--clr-text-muted);
  border: 1.5px solid var(--clr-border-2);
  background: transparent;
}
.nav-auth-login:hover {
  color: var(--clr-text);
  border-color: var(--clr-accent);
}
.nav-auth-signup {
  background: var(--clr-accent);
  color: #0a0e14;
  border: 1.5px solid transparent;
}
.nav-auth-signup:hover {
  opacity: 0.9;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(30,155,255,0.35);
}
[data-theme="light"] .nav-auth-signup { color: #fff; }
[data-theme="light"] .nav-auth-signup:hover { background: #0857b8; }
.nav-auth-user {
  color: var(--clr-accent);
  border: 1.5px solid rgba(30,155,255,0.25);
  background: rgba(30,155,255,0.07);
  font-size: 0.8rem;
}
.nav-auth-user:hover {
  background: rgba(30,155,255,0.13);
}
@media (max-width: 768px) {
  .nav-auth-label { display: none; }
  .nav-auth-btn   { padding: 6px 10px; }
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: 0.6rem;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.section-label svg { flex-shrink: 0; }

@media (max-width: 640px) {
  .nav-brand,
  .footer-brand { min-height: 40px; }
  .streak-pill,
  .nav-auth-btn { min-height: 38px; }
}