/* ============================================
   SAO-Style Right-Side Navigation Buttons
   ============================================ */

.sao-nav {
  position: fixed;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
  z-index: 1000;
  padding: 8px 0;
}

.sao-nav-container {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

/* ---------- Nav Toggle Trigger ---------- */
.sao-nav::before {
  content: '◆';
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--sao-accent);
  font-size: 0.7rem;
  opacity: 0.5;
  transition: opacity 0.3s;
  pointer-events: none;
  z-index: 10;
}

.sao-nav:hover::before {
  opacity: 0;
}

/* ---------- Button Base ---------- */
.sao-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px 10px 14px;
  min-width: 160px;
  background: rgba(10, 14, 23, 0.65);
  border: 1px solid rgba(100, 200, 255, 0.12);
  border-right: none;
  border-radius: 2px 0 0 2px;
  color: var(--sao-text-muted);
  font-size: 0.82rem;
  font-family: var(--sao-font);
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.35s ease;
  text-decoration: none;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  overflow: hidden;
  transform: translateX(160px);
  opacity: 0;
}

.sao-nav:hover .sao-btn {
  transform: translateX(90px);
  opacity: 1;
}

.sao-nav:hover .sao-btn:hover {
  transform: translateX(0);
  background: rgba(100, 200, 255, 0.08);
  border-color: rgba(100, 200, 255, 0.35);
  color: #fff;
}

.sao-btn.active {
  background: rgba(100, 200, 255, 0.1);
  border-color: var(--sao-accent);
  color: #fff;
  box-shadow: inset 3px 0 0 var(--sao-accent), 0 0 15px rgba(100, 200, 255, 0.1);
}

.sao-nav:hover .sao-btn.active {
  transform: translateX(0);
  opacity: 1;
}

/* 悬浮扫描线效果 */
.sao-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(100, 200, 255, 0.06), transparent);
  transition: left 0.5s ease;
  pointer-events: none;
}

.sao-btn:hover::before {
  left: 100%;
}

/* ---------- Icon ---------- */
.sao-btn-icon {
  width: 22px;
  text-align: center;
  font-size: 0.95rem;
  flex-shrink: 0;
  transition: color 0.3s, text-shadow 0.3s;
}

.sao-btn:hover .sao-btn-icon,
.sao-btn.active .sao-btn-icon {
  color: var(--sao-accent);
  text-shadow: 0 0 8px rgba(100, 200, 255, 0.5);
}

/* ---------- Text ---------- */
.sao-btn-text {
  white-space: nowrap;
  font-weight: 400;
  transition: letter-spacing 0.3s;
}

.sao-btn:hover .sao-btn-text {
  letter-spacing: 1.5px;
}

/* ---------- Diamond Indicator ---------- */
.sao-btn-diamond {
  position: absolute;
  left: 6px;
  top: 50%;
  width: 5px;
  height: 5px;
  background: transparent;
  border: 1px solid transparent;
  transform: translateY(-50%) rotate(45deg);
  transition: all 0.3s;
}

.sao-btn:hover .sao-btn-diamond {
  border-color: rgba(100, 200, 255, 0.4);
}

.sao-btn.active .sao-btn-diamond {
  background: var(--sao-accent);
  border-color: var(--sao-accent);
  box-shadow: 0 0 6px var(--sao-accent);
}

/* ---------- Login Button Special ---------- */
.sao-btn-login {
  margin-top: 8px;
  border-color: rgba(240, 192, 64, 0.2);
}

.sao-btn-login:hover {
  border-color: rgba(240, 192, 64, 0.5);
  background: rgba(240, 192, 64, 0.08);
}

.sao-btn-login:hover .sao-btn-icon {
  color: var(--sao-gold);
  text-shadow: 0 0 8px rgba(240, 192, 64, 0.5);
}

.sao-btn-login:hover .sao-btn-diamond {
  border-color: rgba(240, 192, 64, 0.5);
}

.sao-btn-login.active {
  border-color: var(--sao-gold);
  box-shadow: inset 3px 0 0 var(--sao-gold), 0 0 15px rgba(240, 192, 64, 0.1);
}

.sao-btn-login.active .sao-btn-diamond {
  background: var(--sao-gold);
  border-color: var(--sao-gold);
  box-shadow: 0 0 6px var(--sao-gold);
}

.sao-btn-login.active .sao-btn-icon {
  color: var(--sao-gold);
}

/* ---------- Mobile: Bottom Bar ---------- */
@media (max-width: 768px) {
  .sao-nav {
    top: auto;
    right: 0;
    bottom: 0;
    left: 0;
    transform: none;
    padding: 0;
    background: rgba(10, 14, 23, 0.92);
    border-top: 1px solid rgba(100, 200, 255, 0.15);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  .sao-nav-container {
    flex-direction: row;
    overflow-x: auto;
    gap: 0;
    padding: 0 4px;
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

  .sao-nav-container::-webkit-scrollbar {
    display: none;
  }

  .sao-nav::before {
    display: none;
  }

  .sao-btn {
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 8px 12px 6px;
    min-width: auto;
    border: none;
    border-radius: 0;
    transform: none !important;
    opacity: 1 !important;
    background: transparent;
    flex-shrink: 0;
  }

  .sao-btn:hover {
    transform: none;
    background: rgba(100, 200, 255, 0.06);
  }

  .sao-btn.active {
    transform: none;
    background: rgba(100, 200, 255, 0.08);
    box-shadow: inset 0 -2px 0 var(--sao-accent);
  }

  .sao-btn-icon {
    font-size: 1.1rem;
  }

  .sao-btn-text {
    font-size: 0.6rem;
    letter-spacing: 0;
  }

  .sao-btn:hover .sao-btn-text {
    letter-spacing: 0;
  }

  .sao-btn-diamond {
    display: none;
  }

  .sao-btn-login {
    margin-top: 0;
  }

  .sao-btn::before {
    display: none;
  }
}